Imports System.Windows.Forms
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.IO
Imports System.Text.Json
Imports System.Text.Json.Serialization
Imports System.Linq
Imports System.ComponentModel
Imports System.Reflection

Public Class frmDesigner
    Inherits Form

#Region " Variables "

    Private lastMouseMoveTime As DateTime = DateTime.MinValue
    Private Const DEBOUNCE_INTERVAL As Integer = 50 ' milliseconds

    Public gameTriggers As New List(Of GameTrigger)
    Public Event ObjectSelected(selectedObject As SelectedObject)
    Public Property SelectionMode As Boolean
    Public Property SelectionRequestedByForm As Form
    Public Property SelectionRequestedFor As String

    Private isSelectionReadyToDrag As Boolean = False
    Private isDraggingSelection As Boolean = False
    Private selectionOffset As Point ' The offset between mouse position and selection rectangle origin
    Private selectionData As SelectionData
    Private selectionStartCell As Point ' The grid cell coordinates corresponding to selectionRectangle's original position

    Private Const INDENT As Integer = 20
    Friend SQCOUNTX As Integer = 16
    Friend SQCOUNTY As Integer = 11
    Private Const WALL_THICKNESS As Integer = 10

    Friend wallsHatchStyle As HatchStyle = HatchStyle.Cross
    Friend wallsColor1 As Color = Color.Gray
    Friend wallsColor2 As Color = Color.DarkGray
    Friend floorsHatchStyle As HatchStyle = HatchStyle.SmallCheckerBoard
    Friend floorsColor1 As Color = Color.LightGray
    Friend floorsColor2 As Color = Color.White

    Friend floorsUseEdgeStyle()() As Boolean ' New array to track edge style usage

    Private SQSizeX As Integer
    Private SQSizeY As Integer

    Private isRightMouseDown As Boolean = False
    Private isLeftMouseDown As Boolean = False
    Private isMouseInsideGrid As Boolean = False

    Private highlightedX As Integer
    Private highlightedY As Integer
    Private highlightedWallX As Boolean = False
    Private highlightedWallY As Boolean = False
    Private highlightColor As Color = Color.Black
    Private highlightTimer As Timer

    Private isRestoringState As Boolean = False
    Private isActionInProgress As Boolean = False
    Private undoStack As New Stack(Of RoomState)
    Private redoStack As New Stack(Of RoomState)

    Private ReadOnly projectDir As String = GetProjectDirectory()
    Private ReadOnly premadesFolder As String = Path.Combine(projectDir, "Data", "Premades")
    Private ReadOnly savesFolder As String = Path.Combine(projectDir, "Data", "Saves")
    Private ReadOnly musicFolder As String = Path.Combine(projectDir, "Data", "Sound/Music")
    Private currentFilePath As String = ""
    Friend SelectedMusic As String = ""

    Friend verticalWalls()() As Boolean
    Friend horizontalWalls()() As Boolean

    Friend placedItems()() As PlacedItem
    Friend verticalWallItems()() As PlacedItem
    Friend horizontalWallItems()() As PlacedItem

    Private animatedImages As New List(Of Image)
    Private animationTimer As Timer

    Private isDraggingItem As Boolean = False
    Private draggedItem As PlacedItem = Nothing
    Private draggedItemIsWall As Boolean = False
    Private draggedItemIsVerticalWall As Boolean = False
    Private draggedItemOriginalX As Integer
    Private draggedItemOriginalY As Integer

    Private mouseX As Integer
    Private mouseY As Integer

    Private rand As New Random()

    Private rightMouseDownPosition As Point
    Private rightMouseDownTime As DateTime
    Private Const CLICK_DRAG_THRESHOLD As Integer = 5 ' pixels
    Private Const CLICK_DRAG_THRESHOLD_SQUARED As Integer = CLICK_DRAG_THRESHOLD * CLICK_DRAG_THRESHOLD

    Private isSelecting As Boolean = False
    Private isInSelectionMode As Boolean = False
    Private selectionStartPoint As Point
    Private selectionEndPoint As Point
    Private selectionRectangle As Rectangle

    Public useGradient As Boolean = False
    Private copiedSelectionData As SelectionData
    Private copiedSelectionType As String
    Private isCopying As Boolean = False

#End Region

#Region " Constructor and Initialization "
    Public Sub New()
        InitializeComponent()
        InitializeWalls()
        InitializeTimers()
        InitializeEventHandlers()
        LoadPremades()
        LoadMusic()
        InitializeAnimationForImages()
        If Not isRestoringState Then SaveStateForUndo()
        Me.KeyPreview = True

        ' Enable double buffering for picGame
        EnableDoubleBuffering(picGame)

        ' Initialize the status bar
    End Sub

    Private Sub EnableDoubleBuffering(control As Control)
        Dim propertyInfo As PropertyInfo = control.GetType().GetProperty("DoubleBuffered", BindingFlags.NonPublic Or BindingFlags.Instance)
        propertyInfo.SetValue(control, True, Nothing)
    End Sub

    Private Sub cboStyleChoice_SelectedIndexChanged(sender As Object, e As EventArgs) Handles cboStyleChoice.SelectedIndexChanged
        useGradient = cboStyleChoice.SelectedItem.ToString() = "Gradient"
        lstHatchstyles.Enabled = Not useGradient
        picGame.Invalidate() ' Redraw the picGame control
    End Sub

    Private Sub frmDesigner_KeyDown(sender As Object, e As KeyEventArgs) Handles Me.KeyDown
        ' Check for Ctrl+Z (Undo)
        If e.Control AndAlso e.KeyCode = Keys.Z Then
            btnUndo_Click(sender, e)
            e.SuppressKeyPress = True ' Prevent further processing
        End If

        ' Check for Ctrl+Y (Redo)
        If e.Control AndAlso e.KeyCode = Keys.Y Then
            btnRedo_Click(sender, e)
            e.SuppressKeyPress = True
        End If
    End Sub

    Private Function GetProjectDirectory() As String
        Dim dir As DirectoryInfo = New DirectoryInfo(Application.StartupPath)
        For i As Integer = 1 To 4 ' Adjust this number based on your directory structure
            If dir.Parent IsNot Nothing Then
                dir = dir.Parent
            End If
        Next
        Return dir.FullName
    End Function

    Friend Sub InitializeWalls()
        verticalWalls = New Boolean(SQCOUNTX)() {}
        verticalWallItems = New PlacedItem(SQCOUNTX)() {}
        For x As Integer = 0 To SQCOUNTX
            verticalWalls(x) = New Boolean(SQCOUNTY - 1) {}
            verticalWallItems(x) = New PlacedItem(SQCOUNTY - 1) {}
            For y As Integer = 0 To SQCOUNTY - 1
                verticalWalls(x)(y) = True
                verticalWallItems(x)(y) = Nothing
            Next
        Next

        horizontalWalls = New Boolean(SQCOUNTX - 1)() {}
        horizontalWallItems = New PlacedItem(SQCOUNTX - 1)() {}
        For x As Integer = 0 To SQCOUNTX - 1
            horizontalWalls(x) = New Boolean(SQCOUNTY) {}
            horizontalWallItems(x) = New PlacedItem(SQCOUNTY) {}
            For y As Integer = 0 To SQCOUNTY
                horizontalWalls(x)(y) = True
                horizontalWallItems(x)(y) = Nothing
            Next
        Next

        placedItems = New PlacedItem(SQCOUNTX - 1)() {}
        For x As Integer = 0 To SQCOUNTX - 1
            placedItems(x) = New PlacedItem(SQCOUNTY - 1) {}
            For y As Integer = 0 To SQCOUNTY - 1
                placedItems(x)(y) = Nothing
            Next
        Next

        floorsUseEdgeStyle = New Boolean(SQCOUNTX - 1)() {}
        For x As Integer = 0 To SQCOUNTX - 1
            floorsUseEdgeStyle(x) = New Boolean(SQCOUNTY - 1) {}
            For y As Integer = 0 To SQCOUNTY - 1
                floorsUseEdgeStyle(x)(y) = False
            Next
        Next
    End Sub

    Private Sub InitializeTimers()
        highlightTimer = New Timer() With {.Interval = 500}
        AddHandler highlightTimer.Tick, AddressOf HighlightTimer_Tick
        highlightTimer.Start()

        animationTimer = New Timer() With {.Interval = 100} ' Update every 100 milliseconds (10 times per second)
        AddHandler animationTimer.Tick, AddressOf OnAnimationTick
        animationTimer.Start()
    End Sub

    Private Sub InitializeEventHandlers()
        AddColorPictureBoxHandlers(Me)

        ' Add handlers for item picture boxes
        AddHandler picBlock1.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picBaddy1.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picBaddy2.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picLazer1.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picLazer2.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picFlipper1.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picFlipper2.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picFlipper3.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picFlipper4.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picBaddy3.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picBaddy4.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picCoin.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picGate.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picKey.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picStart.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picFinish.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picBlockStopper1.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picBall.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picBlockSwitch.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picBomb.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picWarp.MouseDown, AddressOf PicBlock_MouseDown
        AddHandler picWarp2.MouseDown, AddressOf PicBlock_MouseDown

        ' Add handlers for form-level mouse events
        AddHandler Me.MouseMove, AddressOf Form_MouseMove
        AddHandler Me.MouseUp, AddressOf Form_MouseUp

        ' Add handlers for picGame
        picGame.AllowDrop = True
        AddHandler picGame.MouseDown, AddressOf PicGame_MouseDown
        AddHandler picGame.MouseUp, AddressOf PicGame_MouseUp
        AddHandler picGame.MouseMove, AddressOf PicGame_MouseMove
        AddHandler picGame.Paint, AddressOf PicGame_Paint

        ' Add handlers for buttons
        AddHandler btnUndo.Click, AddressOf btnUndo_Click
        AddHandler btnRedo.Click, AddressOf btnRedo_Click
        AddHandler btnAll.Click, AddressOf btnAll_Click
        AddHandler btnWall.Click, AddressOf btnWalls_Click
        AddHandler btnFloor.Click, AddressOf btnFloors_Click
        AddHandler btnSavePremade.Click, AddressOf btnSavePremade_Click

        ' Add handler for premades list
        AddHandler lstPremades.SelectedIndexChanged, AddressOf lstPremades_SelectedIndexChanged

        ' Add handler for hatch styles list
        AddHandler lstHatchstyles.SelectedIndexChanged, AddressOf lstHatchstyles_SelectedIndexChanged

        For Each ctl As Control In tabFloor1.Controls
            If TypeOf ctl Is PictureBox Then
                AddHandler ctl.MouseEnter, AddressOf PictureBox_MouseEnter
                AddHandler ctl.MouseLeave, AddressOf PictureBox_MouseLeave
            End If
        Next

        For Each ctl As Control In tabFloor2.Controls
            If TypeOf ctl Is PictureBox Then
                AddHandler ctl.MouseEnter, AddressOf PictureBox_MouseEnter
                AddHandler ctl.MouseLeave, AddressOf PictureBox_MouseLeave
            End If
        Next

        For Each ctl As Control In tabWalls.Controls
            If TypeOf ctl Is PictureBox Then
                AddHandler ctl.MouseEnter, AddressOf PictureBox_MouseEnter
                AddHandler ctl.MouseLeave, AddressOf PictureBox_MouseLeave
            End If
        Next
    End Sub

    Private Sub cboX_SelectedIndexChanged(sender As Object, e As EventArgs) Handles cboX.SelectedIndexChanged
        UpdateGridSize()
    End Sub

    Private Sub cboY_SelectedIndexChanged(sender As Object, e As EventArgs) Handles cboY.SelectedIndexChanged
        UpdateGridSize()
    End Sub

    Private Sub UpdateGridSize()
        Dim newSQCOUNTX As Integer
        Dim newSQCOUNTY As Integer
        If Integer.TryParse(cboX.SelectedItem?.ToString(), newSQCOUNTX) AndAlso Integer.TryParse(cboY.SelectedItem?.ToString(), newSQCOUNTY) Then
            SaveState(True)
            Dim oldSQCOUNTX As Integer = SQCOUNTX
            Dim oldSQCOUNTY As Integer = SQCOUNTY
            SQCOUNTX = newSQCOUNTX
            SQCOUNTY = newSQCOUNTY
            useGradient = (cboStyleChoice.SelectedItem?.ToString() = "Gradient")
            ResizeArrays(oldSQCOUNTX, oldSQCOUNTY, SQCOUNTX, SQCOUNTY)
            CalculateSquareSizes(picGame.ClientSize.Width, picGame.ClientSize.Height)
            picGame.Invalidate()
            highlightedX = -1
            highlightedY = -1
            isMouseInsideGrid = False
            selectionRectangle = Rectangle.Empty
        End If
    End Sub

    Friend Sub ResizeArrays(oldX As Integer, oldY As Integer, newX As Integer, newY As Integer)
        verticalWalls = ResizeJaggedArray(verticalWalls, oldX + 1, oldY - 1, newX + 1, newY - 1, True)
        verticalWallItems = ResizeJaggedArray(verticalWallItems, oldX + 1, oldY - 1, newX + 1, newY - 1, False)
        horizontalWalls = ResizeJaggedArray(horizontalWalls, oldX - 1, oldY + 1, newX - 1, newY + 1, True)
        horizontalWallItems = ResizeJaggedArray(horizontalWallItems, oldX - 1, oldY + 1, newX - 1, newY + 1, False)
        placedItems = ResizeJaggedArray(placedItems, oldX - 1, oldY - 1, newX - 1, newY - 1, False)
        floorsUseEdgeStyle = ResizeJaggedArray(floorsUseEdgeStyle, oldX - 1, oldY - 1, newX - 1, newY - 1, False)
        FillBorderWalls()
    End Sub

    Private Function ResizeJaggedArray(Of T)(sourceArray As T()(), oldSizeX As Integer, oldSizeY As Integer, newSizeX As Integer, newSizeY As Integer, initializeValue As Boolean) As T()()
        Dim newArray As T()() = New T(newSizeX)() {}
        For x As Integer = 0 To newSizeX
            newArray(x) = New T(newSizeY) {}
            For y As Integer = 0 To newSizeY
                If x < sourceArray.Length AndAlso y < sourceArray(x).Length Then
                    newArray(x)(y) = sourceArray(x)(y)
                Else
                    If GetType(T) Is GetType(Boolean) AndAlso initializeValue Then
                        newArray(x)(y) = CType(Convert.ChangeType(True, GetType(T)), T)
                    Else
                        newArray(x)(y) = Nothing
                    End If
                End If
            Next
        Next
        Return newArray
    End Function

    Public Sub PictureBox_MouseEnter(sender As Object, e As EventArgs)
        Dim pb As PictureBox = DirectCast(sender, PictureBox)
        pb.BackColor = Color.LightBlue
    End Sub

    Public Sub PictureBox_MouseLeave(sender As Object, e As EventArgs)
        Dim pb As PictureBox = DirectCast(sender, PictureBox)
        pb.BackColor = Color.Transparent
    End Sub

    Private Sub InitializeAnimationForImages()
        animatedImages.Add(picBaddy1.Image)
        animatedImages.Add(picBaddy2.Image)
        animatedImages.Add(picBaddy3.Image)
        animatedImages.Add(picBaddy4.Image)
        animatedImages.Add(picLazer1.Image)
        animatedImages.Add(picLazer2.Image)
        animatedImages.Add(picFlipper1.Image)
        animatedImages.Add(picFlipper2.Image)
        animatedImages.Add(picFlipper3.Image)
        animatedImages.Add(picFlipper4.Image)
        animatedImages.Add(picCoin.Image)
        animatedImages.Add(picGate.Image)
        animatedImages.Add(picKey.Image)
        animatedImages.Add(picStart.Image)
        animatedImages.Add(picFinish.Image)
        animatedImages.Add(picBall.Image)
        animatedImages.Add(picBomb.Image)
        animatedImages.Add(picWarp.Image)
        animatedImages.Add(picWarp2.Image)

        For Each img In animatedImages
            If img IsNot Nothing Then
                ImageAnimator.Animate(img, AddressOf OnFrameChanged)
            End If
        Next
    End Sub

#End Region

#Region " Event Handlers "

    Private Sub frmDesigner_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        RemoveHandler cboX.SelectedIndexChanged, AddressOf cboX_SelectedIndexChanged
        RemoveHandler cboY.SelectedIndexChanged, AddressOf cboY_SelectedIndexChanged

        If cboX.Items.Contains(SQCOUNTX.ToString()) Then
            cboX.SelectedItem = SQCOUNTX.ToString()
        End If
        If cboY.Items.Contains(SQCOUNTY.ToString()) Then
            cboY.SelectedItem = SQCOUNTY.ToString()
        End If

        AddHandler cboX.SelectedIndexChanged, AddressOf cboX_SelectedIndexChanged
        AddHandler cboY.SelectedIndexChanged, AddressOf cboY_SelectedIndexChanged

        LoadMusic()
        LoadPremades()
        UpdateSelections()
    End Sub

    Private Sub LoadPremades()
        If Not Directory.Exists(premadesFolder) Then Directory.CreateDirectory(premadesFolder)
        lstPremades.Items.Clear()
        For Each file As String In Directory.GetFiles(premadesFolder, "*.Premade")
            lstPremades.Items.Add(Path.GetFileNameWithoutExtension(file))
        Next
    End Sub

    Private Sub LoadMusic()
        If Not Directory.Exists(musicFolder) Then
            Directory.CreateDirectory(musicFolder)
        End If

        Dim allowedExtensions As String() = {".mp3", ".wav"}
        Dim musicFileFound As Boolean = False

        For Each file As String In Directory.GetFiles(musicFolder)
            Dim extension As String = Path.GetExtension(file).ToLower()
            If allowedExtensions.Contains(extension) Then
                Dim fileNameWithoutExtension As String = Path.GetFileNameWithoutExtension(file)
                Dim volume As Integer = 50
                Dim gain As Integer = 10

                SelectedMusic = String.Format("{0}{1}, V:{2}, G:{3}", file, extension, volume, gain)
                lblAudio.Text = String.Format("{0}, V:{1}, G:{2}", fileNameWithoutExtension, volume, gain)

                musicFileFound = True
                Exit For
            End If
        Next

        If Not musicFileFound Then
            lblAudio.Text = "No music files found."
            SelectedMusic = String.Empty
        End If
    End Sub

    Private Sub OnAnimationTick(sender As Object, e As EventArgs)
        For Each img In animatedImages
            ImageAnimator.UpdateFrames(img)
        Next
        picGame.Invalidate()
    End Sub

    Private Sub OnFrameChanged(o As Object, e As EventArgs)
    End Sub

    Private Sub HighlightTimer_Tick(sender As Object, e As EventArgs)
        highlightColor = If(highlightColor = Color.Black, Color.White, Color.Black)
        picGame.Invalidate()
    End Sub

    Private Sub lstPremades_SelectedIndexChanged(sender As Object, e As EventArgs)
        If lstPremades.SelectedIndex >= 0 Then
            If Not isRestoringState Then SaveStateForUndo()
            Dim selectedPremade As String = lstPremades.SelectedItem.ToString()
            LoadSettingsFromFile(Path.Combine(premadesFolder, selectedPremade & ".Premade"))
            UpdateSelections()
            picGame.Invalidate()
        End If
    End Sub

    Private Sub mnuClearWalls_Click(sender As Object, e As EventArgs) Handles mnuClearWalls.Click
        If Not selectionRectangle.IsEmpty Then
            If Not isRestoringState Then SaveStateForUndo()

            For Each pt As Point In GetVerticalWallsInRectangle(selectionRectangle)
                If Not IsVerticalWallOuterBorder(pt.X) AndAlso Not IsVerticalWallConnectedToEdge(pt) Then
                    verticalWalls(pt.X)(pt.Y) = False
                    verticalWallItems(pt.X)(pt.Y) = Nothing
                End If
            Next

            For Each pt As Point In GetHorizontalWallsInRectangle(selectionRectangle)
                If Not IsHorizontalWallOuterBorder(pt.Y) AndAlso Not IsHorizontalWallConnectedToEdge(pt) Then
                    horizontalWalls(pt.X)(pt.Y) = False
                    horizontalWallItems(pt.X)(pt.Y) = Nothing
                End If
            Next

            selectionRectangle = Rectangle.Empty
            isInSelectionMode = False
            Cursor = Cursors.Default
            picGame.Invalidate()
        End If
    End Sub

    Private Sub mnuFillWalls_Click(sender As Object, e As EventArgs) Handles mnuFillWalls.Click
        If Not selectionRectangle.IsEmpty Then
            If Not isRestoringState Then SaveStateForUndo()

            For Each pt As Point In GetVerticalWallsInRectangle(selectionRectangle)
                If pt.X > 0 AndAlso pt.X < SQCOUNTX Then
                    verticalWalls(pt.X)(pt.Y) = True
                End If
            Next

            For Each pt As Point In GetHorizontalWallsInRectangle(selectionRectangle)
                If pt.Y > 0 AndAlso pt.Y < SQCOUNTY Then
                    horizontalWalls(pt.X)(pt.Y) = True
                End If
            Next

            selectionRectangle = Rectangle.Empty
            isInSelectionMode = False
            Cursor = Cursors.Default
            picGame.Invalidate()
        End If
    End Sub

    Private Sub mnuClearObjects_Click(sender As Object, e As EventArgs) Handles mnuClearObjects.Click
        If Not selectionRectangle.IsEmpty Then
            If Not isRestoringState Then SaveStateForUndo()

            For Each pt As Point In GetCellsInRectangle(selectionRectangle)
                placedItems(pt.X)(pt.Y) = Nothing
            Next

            For Each pt As Point In GetVerticalWallsInRectangle(selectionRectangle)
                verticalWallItems(pt.X)(pt.Y) = Nothing
            Next

            For Each pt As Point In GetHorizontalWallsInRectangle(selectionRectangle)
                horizontalWallItems(pt.X)(pt.Y) = Nothing
            Next

            selectionRectangle = Rectangle.Empty
            isInSelectionMode = False
            Cursor = Cursors.Default
            picGame.Invalidate()
        End If
    End Sub

    Private Sub mnuClearEdge_Click(sender As Object, e As EventArgs) Handles mnuClearEdge.Click
        If Not selectionRectangle.IsEmpty Then
            If Not isRestoringState Then SaveStateForUndo()

            For Each pt As Point In GetCellsInRectangle(selectionRectangle)
                floorsUseEdgeStyle(pt.X)(pt.Y) = False
            Next

            selectionRectangle = Rectangle.Empty
            isInSelectionMode = False
            Cursor = Cursors.Default
            picGame.Invalidate()
        End If
    End Sub

    Private Sub mnuAddEdge_Click(sender As Object, e As EventArgs) Handles mnuAddEdge.Click
        If Not selectionRectangle.IsEmpty Then
            If Not isRestoringState Then SaveStateForUndo()

            For Each pt As Point In GetCellsInRectangle(selectionRectangle)
                floorsUseEdgeStyle(pt.X)(pt.Y) = True

                If pt.X >= 0 AndAlso pt.X < verticalWalls.Length Then
                    verticalWallItems(pt.X)(pt.Y) = Nothing
                    verticalWalls(pt.X)(pt.Y) = True
                End If

                If pt.X + 1 >= 0 AndAlso pt.X + 1 < verticalWalls.Length Then
                    verticalWallItems(pt.X + 1)(pt.Y) = Nothing
                    verticalWalls(pt.X + 1)(pt.Y) = True
                End If

                If pt.X >= 0 AndAlso pt.X < horizontalWalls.Length AndAlso pt.Y >= 0 AndAlso pt.Y < horizontalWalls(0).Length Then
                    horizontalWallItems(pt.X)(pt.Y) = Nothing
                    horizontalWalls(pt.X)(pt.Y) = True
                End If

                If pt.X >= 0 AndAlso pt.X < horizontalWalls.Length AndAlso pt.Y + 1 >= 0 AndAlso pt.Y + 1 < horizontalWalls(0).Length Then
                    horizontalWallItems(pt.X)(pt.Y + 1) = Nothing
                    horizontalWalls(pt.X)(pt.Y + 1) = True
                End If
            Next

            selectionRectangle = Rectangle.Empty
            isInSelectionMode = False
            Cursor = Cursors.Default
            picGame.Invalidate()
        End If
    End Sub

    Private Sub mnuMove_Click(sender As Object, e As EventArgs) Handles mnuMove.Click
        isSelectionReadyToDrag = True
        Cursor = Cursors.Hand
        CaptureSelectionData()
    End Sub

    Private Sub mnuCopyAll_Click(sender As Object, e As EventArgs) Handles mnuCopyAll.Click
        If Not selectionRectangle.IsEmpty Then
            CaptureSelectionData()
            copiedSelectionData = selectionData
            copiedSelectionType = "All"
            isCopying = True
            Cursor = Cursors.Hand
            picGame.Capture = True
        End If
    End Sub

    Private Sub mnuCopyGrid_Click(sender As Object, e As EventArgs) Handles mnuCopyGrid.Click
        If Not selectionRectangle.IsEmpty Then
            CaptureSelectionData()
            copiedSelectionData = selectionData
            copiedSelectionType = "Grid"
            isCopying = True
            Cursor = Cursors.Hand
            picGame.Capture = True
        End If
    End Sub

    Private Sub mnuCopyObjects_Click(sender As Object, e As EventArgs) Handles mnuCopyObjects.Click
        If Not selectionRectangle.IsEmpty Then
            CaptureSelectionData()
            copiedSelectionData = selectionData
            copiedSelectionType = "Objects"
            isCopying = True
            Cursor = Cursors.Hand
            picGame.Capture = True
        End If
    End Sub

    Private Sub PasteSelectionData(newCellX As Integer, newCellY As Integer, selectionType As String)
        Select Case selectionType
            Case "Grid"
                For x As Integer = 0 To copiedSelectionData.selectionWidth - 1
                    For y As Integer = 0 To copiedSelectionData.selectionHeight - 1
                        If newCellX + x >= 0 AndAlso newCellX + x < SQCOUNTX AndAlso newCellY + y >= 0 AndAlso newCellY + y < SQCOUNTY Then
                            floorsUseEdgeStyle(newCellX + x)(newCellY + y) = copiedSelectionData.floorsUseEdgeStyle(x)(y)
                        End If
                    Next
                Next

                For x As Integer = 0 To copiedSelectionData.verticalWalls.Length - 1
                    For y As Integer = 0 To copiedSelectionData.verticalWalls(0).Length - 1
                        If newCellX + x >= 0 AndAlso newCellX + x < verticalWalls.Length AndAlso newCellY + y >= 0 AndAlso newCellY + y < verticalWalls(0).Length Then
                            verticalWalls(newCellX + x)(newCellY + y) = copiedSelectionData.verticalWalls(x)(y)
                            verticalWallItems(newCellX + x)(newCellY + y) = copiedSelectionData.verticalWallItems(x)(y)
                        End If
                    Next
                Next

                For x As Integer = 0 To copiedSelectionData.horizontalWalls.Length - 1
                    For y As Integer = 0 To copiedSelectionData.horizontalWalls(0).Length - 1
                        If newCellX + x >= 0 AndAlso newCellX + x < horizontalWalls.Length AndAlso newCellY + y >= 0 AndAlso newCellY + y < horizontalWalls(0).Length Then
                            horizontalWalls(newCellX + x)(newCellY + y) = copiedSelectionData.horizontalWalls(x)(y)
                            horizontalWallItems(newCellX + x)(newCellY + y) = copiedSelectionData.horizontalWallItems(x)(y)
                        End If
                    Next
                Next

            Case "Objects"
                For x As Integer = 0 To copiedSelectionData.selectionWidth - 1
                    For y As Integer = 0 To copiedSelectionData.selectionHeight - 1
                        If newCellX + x >= 0 AndAlso newCellX + x < SQCOUNTX AndAlso newCellY + y >= 0 AndAlso newCellY + y < SQCOUNTY Then
                            placedItems(newCellX + x)(newCellY + y) = copiedSelectionData.placedItems(x)(y)
                        End If
                    Next
                Next

            Case "All"
                For x As Integer = 0 To copiedSelectionData.selectionWidth - 1
                    For y As Integer = 0 To copiedSelectionData.selectionHeight - 1
                        If newCellX + x >= 0 AndAlso newCellX + x < SQCOUNTX AndAlso newCellY + y >= 0 AndAlso newCellY + y < SQCOUNTY Then
                            placedItems(newCellX + x)(newCellY + y) = copiedSelectionData.placedItems(x)(y)
                            floorsUseEdgeStyle(newCellX + x)(newCellY + y) = copiedSelectionData.floorsUseEdgeStyle(x)(y)
                        End If
                    Next
                Next

                For x As Integer = 0 To copiedSelectionData.verticalWalls.Length - 1
                    For y As Integer = 0 To copiedSelectionData.verticalWalls(0).Length - 1
                        If newCellX + x >= 0 AndAlso newCellX + x < verticalWalls.Length AndAlso newCellY + y >= 0 AndAlso newCellY + y < verticalWalls(0).Length Then
                            verticalWalls(newCellX + x)(newCellY + y) = copiedSelectionData.verticalWalls(x)(y)
                            verticalWallItems(newCellX + x)(newCellY + y) = copiedSelectionData.verticalWallItems(x)(y)
                        End If
                    Next
                Next

                For x As Integer = 0 To copiedSelectionData.horizontalWalls.Length - 1
                    For y As Integer = 0 To copiedSelectionData.horizontalWalls(0).Length - 1
                        If newCellX + x >= 0 AndAlso newCellX + x < horizontalWalls.Length AndAlso newCellY + y >= 0 AndAlso newCellY + y < horizontalWalls(0).Length Then
                            horizontalWalls(newCellX + x)(newCellY + y) = copiedSelectionData.horizontalWalls(x)(y)
                            horizontalWallItems(newCellX + x)(newCellY + y) = copiedSelectionData.horizontalWallItems(x)(y)
                        End If
                    Next
                Next
        End Select
    End Sub

    Private Sub btnSelect_Click(sender As Object, e As EventArgs) Handles btnSelect.Click
        If isInSelectionMode Then
            isInSelectionMode = False
            Cursor = Cursors.Default
            selectionRectangle = Rectangle.Empty
            picGame.Invalidate()
        Else
            isInSelectionMode = True
            Cursor = Cursors.Cross
        End If
    End Sub

    Private Sub mnuCancel_Click(sender As Object, e As EventArgs) Handles mnuCancel.Click
        selectionRectangle = Rectangle.Empty
        isInSelectionMode = False
        isSelectionReadyToDrag = False
        Cursor = Cursors.Default
        picGame.Invalidate()
    End Sub

    Private Sub mnuNew_Click(sender As Object, e As EventArgs) Handles mnuNew.Click, btnNew.Click
        If Not isRestoringState Then SaveStateForUndo()
        wallsHatchStyle = HatchStyle.Cross
        wallsColor1 = Color.Gray
        wallsColor2 = Color.DarkGray
        floorsHatchStyle = HatchStyle.SmallCheckerBoard
        floorsColor1 = Color.LightGray
        floorsColor2 = Color.White
        InitializeWalls()
        currentFilePath = ""

        txtName.Text = ""
        SelectedMusic = ""

        UpdateSelections()

        picGame.Invalidate()
    End Sub

    Private Sub mnuSave_Click(sender As Object, e As EventArgs) Handles mnuSave.Click, btnSave.Click
        If String.IsNullOrEmpty(currentFilePath) Then
            mnuSaveAs_Click(sender, e)
        Else
            SaveRoomToFile(currentFilePath)
        End If
    End Sub

    Private Sub mnuLoad_Click(sender As Object, e As EventArgs) Handles mnuLoad.Click, btnOpen.Click
        Dim openDialog As New OpenFileDialog() With {
            .InitialDirectory = savesFolder,
            .Filter = "Room Files (*.room)|*.room",
            .DefaultExt = "room",
            .AddExtension = True,
            .Title = "Load Room"
        }
        If openDialog.ShowDialog() = DialogResult.OK Then
            If Not isRestoringState Then SaveStateForUndo()
            LoadRoomFromFile(openDialog.FileName)
            currentFilePath = openDialog.FileName
            UpdateGridSizeUI()
            UpdateSelections()
            picGame.Invalidate()
        End If
    End Sub

    Private Sub mnuSaveAs_Click(sender As Object, e As EventArgs) Handles mnuSaveAs.Click
        Dim saveDialog As New SaveFileDialog() With {
            .InitialDirectory = savesFolder,
            .Filter = "Room Files (*.room)|*.room",
            .DefaultExt = "room",
            .AddExtension = True,
            .Title = "Save Room As"
        }
        If saveDialog.ShowDialog() = DialogResult.OK Then
            SaveRoomToFile(saveDialog.FileName)
            currentFilePath = saveDialog.FileName
        End If
    End Sub

    Private Sub SaveState(isNewAction As Boolean)
        If isRestoringState Then Return
        If isNewAction Then
            redoStack.Clear()
        End If
        undoStack.Push(New RoomState(Me))
        If undoStack.Count > 50 Then
            undoStack = New Stack(Of RoomState)(undoStack.Reverse().Take(50))
        End If
    End Sub

    Private Sub SaveStateForUndo()
        If isRestoringState Then Return
        undoStack.Push(New RoomState(Me))
        If undoStack.Count > 50 Then
            undoStack = New Stack(Of RoomState)(undoStack.Reverse().Take(50))
        End If
    End Sub

    Private Sub SaveStateForRedo()
        If isRestoringState Then Return
        redoStack.Push(New RoomState(Me))
        If redoStack.Count > 50 Then
            redoStack = New Stack(Of RoomState)(redoStack.Reverse().Take(50))
        End If
    End Sub

    Private Sub btnUndo_Click(sender As Object, e As EventArgs) Handles btnUndo.Click
        If undoStack.Count > 1 Then
            SaveStateForRedo()
            undoStack.Pop()
            isRestoringState = True
            Dim previousState As RoomState = undoStack.Peek()
            previousState.RestoreState(Me)
            isRestoringState = False
            UpdateGridSizeUI()
            UpdateSelections()
            picGame.Invalidate()
        End If
    End Sub

    Private Sub btnRedo_Click(sender As Object, e As EventArgs) Handles btnRedo.Click
        If redoStack.Count > 0 Then
            SaveStateForUndo()
            isRestoringState = True
            Dim redoState As RoomState = redoStack.Pop()
            redoState.RestoreState(Me)
            isRestoringState = False
            UpdateGridSizeUI()
            UpdateSelections()
            picGame.Invalidate()
        End If
    End Sub

    Private Sub btnSavePremade_Click(sender As Object, e As EventArgs)
        Dim saveDialog As New SaveFileDialog() With {
            .InitialDirectory = premadesFolder,
            .Filter = "Premade Files (*.Premade)|*.Premade",
            .DefaultExt = "Premade",
            .AddExtension = True,
            .Title = "Save Premade"
        }
        If saveDialog.ShowDialog() = DialogResult.OK Then
            SaveSettingsToFile(saveDialog.FileName)
            LoadPremades()
        End If
    End Sub

    Private Sub lstHatchstyles_SelectedIndexChanged(sender As Object, e As EventArgs) Handles lstHatchstyles.SelectedIndexChanged
        If lstHatchstyles.SelectedItem IsNot Nothing Then
            Dim selectedHatchStyleName As String = lstHatchstyles.SelectedItem.ToString()
            Dim selectedHatchStyle As HatchStyle = CType([Enum].Parse(GetType(HatchStyle), selectedHatchStyleName), HatchStyle)
            If rdoFloors.Checked Then
                floorsHatchStyle = selectedHatchStyle
            ElseIf rdoWalls.Checked Then
                wallsHatchStyle = selectedHatchStyle
            End If
            If Not isRestoringState Then SaveStateForUndo()
            picGame.Invalidate()
        End If
    End Sub

    Private Sub btnAll_Click(sender As Object, e As EventArgs)
        If Not isRestoringState Then SaveStateForUndo()
        RandomizeWalls()
        RandomizeFloors()
        picGame.Invalidate()
    End Sub

    Private Sub btnWalls_Click(sender As Object, e As EventArgs)
        If Not isRestoringState Then SaveStateForUndo()
        RandomizeWalls()
        picGame.Invalidate()
    End Sub

    Private Sub btnFloors_Click(sender As Object, e As EventArgs)
        If Not isRestoringState Then SaveStateForUndo()
        RandomizeFloors()
        picGame.Invalidate()
    End Sub

    Private Sub RandomizeWalls()
        wallsColor1 = Color.FromArgb(rand.Next(256), rand.Next(256), rand.Next(256))
        wallsColor2 = Color.FromArgb(rand.Next(256), rand.Next(256), rand.Next(256))
        Dim hatchStyles As Array = [Enum].GetValues(GetType(HatchStyle))
        wallsHatchStyle = CType(hatchStyles.GetValue(rand.Next(hatchStyles.Length)), HatchStyle)
        UpdateSelections()
    End Sub

    Private Sub RandomizeFloors()
        floorsColor1 = Color.FromArgb(rand.Next(256), rand.Next(256), rand.Next(256))
        floorsColor2 = Color.FromArgb(rand.Next(256), rand.Next(256), rand.Next(256))
        Dim hatchStyles As Array = [Enum].GetValues(GetType(HatchStyle))
        floorsHatchStyle = CType(hatchStyles.GetValue(rand.Next(hatchStyles.Length)), HatchStyle)
        UpdateSelections()
    End Sub

    Private Sub UpdateSelections()
        If rdoWalls.Checked Then
            lstHatchstyles.SelectedItem = wallsHatchStyle.ToString()
        ElseIf rdoFloors.Checked Then
            lstHatchstyles.SelectedItem = floorsHatchStyle.ToString()
        ElseIf rdoEdge.Checked Then
            lstHatchstyles.SelectedItem = wallsHatchStyle.ToString()
        End If

        cboStyleChoice.Enabled = rdoFloors.Checked

        If rdoFloors.Checked AndAlso useGradient Then
            lstHatchstyles.Enabled = False
        Else
            lstHatchstyles.Enabled = True
        End If

        If cboStyleChoice.Items.Count > 0 Then
            If useGradient Then
                cboStyleChoice.SelectedIndex = cboStyleChoice.Items.IndexOf("Gradient")
            Else
                cboStyleChoice.SelectedIndex = cboStyleChoice.Items.IndexOf("HatchStyle")
            End If
        End If
    End Sub

    Private Sub rdoWalls_CheckedChanged(sender As Object, e As EventArgs) Handles rdoWalls.CheckedChanged
        If rdoWalls.Checked Then
            UpdateSelections()
        End If
    End Sub

    Private Sub rdoFloors_CheckedChanged(sender As Object, e As EventArgs) Handles rdoFloors.CheckedChanged
        If rdoFloors.Checked Then
            UpdateSelections()
        End If
    End Sub

    Private Sub rdoEdge_CheckedChanged(sender As Object, e As EventArgs) Handles rdoEdge.CheckedChanged
        If rdoEdge.Checked Then
            UpdateSelections()
        End If
    End Sub

    Private Sub PicGame_Paint(sender As Object, e As PaintEventArgs) Handles picGame.Paint
        CalculateSquareSizes(picGame.ClientSize.Width, picGame.ClientSize.Height)
        e.Graphics.SmoothingMode = SmoothingMode.None

        If useGradient Then
            DrawGradientBackground(e.Graphics)
        End If

        DrawGrid(e.Graphics)

        If isDraggingItem AndAlso draggedItem IsNot Nothing Then
            Dim img As Image = GetImageByKey(draggedItem.ImageKey)
            If img IsNot Nothing Then
                ImageAnimator.UpdateFrames(img)
                Dim drawRect As Rectangle

                If draggedItemIsWall Then
                    If draggedItemIsVerticalWall Then
                        Dim wallWidth As Integer = WALL_THICKNESS
                        Dim wallHeight As Integer = SQSizeY
                        Dim xPos As Integer = mouseX - WALL_THICKNESS \ 2
                        Dim yPos As Integer = mouseY - SQSizeY \ 2
                        Dim newWidth As Integer = img.Width
                        Dim newHeight As Integer = wallHeight
                        Dim centeredX As Integer = xPos + (wallWidth - newWidth) \ 2
                        drawRect = New Rectangle(centeredX, yPos, newWidth, newHeight)
                    Else
                        Dim wallWidth As Integer = SQSizeX
                        Dim wallHeight As Integer = WALL_THICKNESS
                        Dim xPos As Integer = mouseX - SQSizeX \ 2
                        Dim yPos As Integer = mouseY - WALL_THICKNESS \ 2
                        Dim newWidth As Integer = wallWidth
                        Dim newHeight As Integer = img.Height
                        Dim centeredY As Integer = yPos + (wallHeight - newHeight) \ 2
                        drawRect = New Rectangle(xPos, centeredY, newWidth, newHeight)
                    End If
                Else
                    Dim xPos As Integer = mouseX - SQSizeX \ 2
                    Dim yPos As Integer = mouseY - SQSizeY \ 2
                    drawRect = New Rectangle(xPos, yPos, SQSizeX, SQSizeY)
                End If
                e.Graphics.DrawImage(img, drawRect)
            End If
        End If

        If (isInSelectionMode OrElse isSelectionReadyToDrag OrElse isDraggingSelection) AndAlso Not selectionRectangle.IsEmpty Then
            Using selectionBrush As New SolidBrush(Color.FromArgb(64, Color.Blue))
                e.Graphics.FillRectangle(selectionBrush, selectionRectangle)
            End Using
            Using selectionPen As New Pen(Color.Blue, 2) With {.DashStyle = DashStyle.Dash}
                e.Graphics.DrawRectangle(selectionPen, selectionRectangle)
            End Using
        End If

        If isDraggingSelection Then
            Dim drawCellX As Integer = (selectionRectangle.X - INDENT) \ (SQSizeX + WALL_THICKNESS)
            Dim drawCellY As Integer = (selectionRectangle.Y - INDENT) \ (SQSizeY + WALL_THICKNESS)
            DrawSelectionData(e.Graphics, drawCellX, drawCellY)
        End If

        ' Ensure DrawHighlight is called
        DrawHighlight(e.Graphics)
    End Sub

    Private Sub DrawGradientBackground(g As Graphics)
        Dim xOrigin As Integer = INDENT
        Dim yOrigin As Integer = INDENT
        Dim gridWidth As Integer = SQCOUNTX * (SQSizeX + WALL_THICKNESS)
        Dim gridHeight As Integer = SQCOUNTY * (SQSizeY + WALL_THICKNESS)

        Dim gradientRect As New Rectangle(xOrigin, yOrigin, gridWidth, gridHeight)

        Using brush As New LinearGradientBrush(gradientRect, floorsColor1, floorsColor2, LinearGradientMode.Vertical)
            g.FillRectangle(brush, gradientRect)
        End Using
    End Sub

    Private Sub Form_MouseMove(sender As Object, e As MouseEventArgs)
        If isDraggingItem Then
            Dim screenPos As Point = Me.PointToScreen(New Point(e.X, e.Y))
            Dim picGameClientPoint As Point = picGame.PointToClient(screenPos)

            mouseX = picGameClientPoint.X
            mouseY = picGameClientPoint.Y

            If picGame.ClientRectangle.Contains(picGameClientPoint) Then
                UpdateHighlight(mouseX, mouseY)
                isMouseInsideGrid = True
            Else
                isMouseInsideGrid = False
            End If

            picGame.Invalidate() ' Invalidate only the picGame control
        End If

        UpdateStatusBar(e.X, e.Y)
    End Sub
    Private Function IsVerticalWallOuterBorder(x As Integer) As Boolean
        Return x = 0 OrElse x = SQCOUNTX
    End Function

    Private Function IsHorizontalWallOuterBorder(y As Integer) As Boolean
        Return y = 0 OrElse y = SQCOUNTY
    End Function

    Private Sub Form_MouseUp(sender As Object, e As MouseEventArgs)
        If isDraggingItem AndAlso e.Button = MouseButtons.Left Then
            isDraggingItem = False
            Me.Capture = False
            Cursor.Current = Cursors.Default

            Dim screenPos As Point = Me.PointToScreen(New Point(e.X, e.Y))
            Dim picGameClientPoint As Point = picGame.PointToClient(screenPos)

            If picGame.ClientRectangle.Contains(picGameClientPoint) Then
                mouseX = picGameClientPoint.X
                mouseY = picGameClientPoint.Y
                UpdateHighlight(mouseX, mouseY)

                If isMouseInsideGrid Then
                    If highlightedWallX AndAlso draggedItemIsWall AndAlso draggedItemIsVerticalWall Then
                        If highlightedX >= 0 AndAlso highlightedX < verticalWallItems.Length AndAlso
                   verticalWallItems(highlightedX) IsNot Nothing AndAlso
                   highlightedY >= 0 AndAlso highlightedY < verticalWallItems(0).Length Then

                            If Not IsVerticalWallConnectedToEdge(New Point(highlightedX, highlightedY)) Then
                                verticalWallItems(highlightedX)(highlightedY) = draggedItem
                                verticalWalls(highlightedX)(highlightedY) = False
                            Else
                                ReturnItemToOriginalLocation()
                            End If
                        End If
                    ElseIf highlightedWallY AndAlso draggedItemIsWall AndAlso Not draggedItemIsVerticalWall Then
                        If highlightedX >= 0 AndAlso highlightedX < horizontalWallItems.Length AndAlso
                   horizontalWallItems(highlightedX) IsNot Nothing AndAlso
                   highlightedY >= 0 AndAlso highlightedY < horizontalWallItems(0).Length Then

                            If Not IsHorizontalWallConnectedToEdge(New Point(highlightedX, highlightedY)) Then
                                horizontalWallItems(highlightedX)(highlightedY) = draggedItem
                                horizontalWalls(highlightedX)(highlightedY) = False
                            Else
                                ReturnItemToOriginalLocation()
                            End If
                        End If
                    ElseIf Not highlightedWallX AndAlso Not highlightedWallY AndAlso Not draggedItemIsWall Then
                        If highlightedX >= 0 AndAlso highlightedX < placedItems.Length AndAlso
                   placedItems(highlightedX) IsNot Nothing AndAlso
                   highlightedY >= 0 AndAlso highlightedY < placedItems(0).Length Then

                            placedItems(highlightedX)(highlightedY) = draggedItem
                        End If
                    Else
                        ReturnItemToOriginalLocation()
                    End If
                Else
                    ReturnItemToOriginalLocation()
                End If
            Else
                ReturnItemToOriginalLocation()
            End If

            draggedItem = Nothing
            If isActionInProgress Then
                isActionInProgress = False
                redoStack.Clear()
            End If

            picGame.Invalidate()
        End If
    End Sub

    Private Sub PicGame_MouseDown(sender As Object, e As MouseEventArgs) Handles picGame.MouseDown
        If SelectionMode Then
            Dim clickedX As Integer = (e.X - INDENT) \ (SQSizeX + WALL_THICKNESS)
            Dim clickedY As Integer = (e.Y - INDENT) \ (SQSizeY + WALL_THICKNESS)

            Dim selected As New SelectedObject With {
        .Type = "Square",
        .Coordinates = New Point(clickedX, clickedY)
    }

            RaiseEvent ObjectSelected(selected)

            SelectionMode = False
            SelectionRequestedByForm = Nothing
            SelectionRequestedFor = Nothing

            Return
        End If
        If isSelectionReadyToDrag Then
            If selectionRectangle.Contains(e.Location) Then
                If e.Button = MouseButtons.Left Then
                    SaveStateForUndo()
                    isDraggingSelection = True
                    selectionOffset = New Point(e.X - selectionRectangle.X, e.Y - selectionRectangle.Y)
                    selectionStartCell = New Point(
                (selectionRectangle.X - INDENT) \ (SQSizeX + WALL_THICKNESS),
                (selectionRectangle.Y - INDENT) \ (SQSizeY + WALL_THICKNESS))
                    picGame.Capture = True
                    Cursor = Cursors.SizeAll
                ElseIf e.Button = MouseButtons.Right Then
                    isSelectionReadyToDrag = False
                    selectionRectangle = Rectangle.Empty
                    Cursor = Cursors.Default
                    picGame.Invalidate()
                End If
            Else
                isSelectionReadyToDrag = False
                selectionRectangle = Rectangle.Empty
                Cursor = Cursors.Default
                picGame.Invalidate()
            End If
        ElseIf isInSelectionMode Then
            If e.Button = MouseButtons.Left Then
                isSelecting = True
                selectionStartPoint = e.Location
                selectionEndPoint = e.Location
                selectionRectangle = GetRectangle(selectionStartPoint, selectionEndPoint)
                picGame.Invalidate()
            End If
        Else
            If e.Button = MouseButtons.Right Then
                isRightMouseDown = True
                rightMouseDownPosition = e.Location
                rightMouseDownTime = DateTime.Now
                If Not isActionInProgress Then
                    isActionInProgress = True
                    SaveStateForUndo()
                End If
            ElseIf e.Button = MouseButtons.Left Then
                isLeftMouseDown = True
                UpdateHighlight(e.X, e.Y)
                Dim itemPickedUp As Boolean = False
                If isMouseInsideGrid Then
                    If Not isActionInProgress Then
                        isActionInProgress = True
                        SaveStateForUndo()
                    End If

                    If highlightedWallX Then
                        If highlightedX >= 0 AndAlso highlightedX <= verticalWallItems.Length AndAlso
                   verticalWallItems(highlightedX) IsNot Nothing AndAlso
                   highlightedY >= 0 AndAlso highlightedY < verticalWallItems(0).Length Then

                            If verticalWallItems(highlightedX)(highlightedY) IsNot Nothing Then
                                isDraggingItem = True
                                draggedItem = verticalWallItems(highlightedX)(highlightedY)
                                draggedItemIsWall = True
                                draggedItemIsVerticalWall = True
                                draggedItemOriginalX = highlightedX
                                draggedItemOriginalY = highlightedY
                                verticalWallItems(highlightedX)(highlightedY) = Nothing
                                verticalWalls(highlightedX)(highlightedY) = True
                                picGame.Capture = True
                                itemPickedUp = True
                            End If
                        End If
                    ElseIf highlightedWallY Then
                        If highlightedX >= 0 AndAlso highlightedX < horizontalWallItems.Length AndAlso
                   horizontalWallItems(highlightedX) IsNot Nothing AndAlso
                   highlightedY >= 0 AndAlso highlightedY <= horizontalWallItems(0).Length Then

                            If horizontalWallItems(highlightedX)(highlightedY) IsNot Nothing Then
                                isDraggingItem = True
                                draggedItem = horizontalWallItems(highlightedX)(highlightedY)
                                draggedItemIsWall = True
                                draggedItemIsVerticalWall = False
                                draggedItemOriginalX = highlightedX
                                draggedItemOriginalY = highlightedY
                                horizontalWallItems(highlightedX)(highlightedY) = Nothing
                                horizontalWalls(highlightedX)(highlightedY) = True
                                picGame.Capture = True
                                itemPickedUp = True
                            End If
                        End If
                    Else
                        If highlightedX >= 0 AndAlso highlightedX < placedItems.Length AndAlso
                   placedItems(highlightedX) IsNot Nothing AndAlso
                   highlightedY >= 0 AndAlso highlightedY < placedItems(0).Length Then

                            If placedItems(highlightedX)(highlightedY) IsNot Nothing Then
                                isDraggingItem = True
                                draggedItem = placedItems(highlightedX)(highlightedY)
                                draggedItemIsWall = False
                                draggedItemIsVerticalWall = False
                                draggedItemOriginalX = highlightedX
                                draggedItemOriginalY = highlightedY
                                placedItems(highlightedX)(highlightedY) = Nothing
                                picGame.Capture = True
                                itemPickedUp = True
                            End If
                        End If
                    End If

                    If itemPickedUp Then
                        redoStack.Clear()
                        picGame.Invalidate()
                    Else
                        If rdoEdge.Checked Then
                            isLeftMouseDown = True
                            SetEdgeStyleAtMousePosition(e.X, e.Y)
                        Else
                            isLeftMouseDown = True
                            AddWallAtMousePosition(e.X, e.Y)
                        End If
                    End If
                End If
            End If
        End If
    End Sub

    Private Sub PicGame_MouseMove(sender As Object, e As MouseEventArgs) Handles picGame.MouseMove
        If isDraggingSelection Then
            Dim newX As Integer = e.X - selectionOffset.X
            Dim newY As Integer = e.Y - selectionOffset.Y

            Dim cellX As Integer = (newX - INDENT + (SQSizeX + WALL_THICKNESS) \ 2) \ (SQSizeX + WALL_THICKNESS)
            Dim cellY As Integer = (newY - INDENT + (SQSizeY + WALL_THICKNESS) \ 2) \ (SQSizeY + WALL_THICKNESS)

            cellX = Math.Max(0, Math.Min(SQCOUNTX - selectionData.selectionWidth, cellX))
            cellY = Math.Max(0, Math.Min(SQCOUNTY - selectionData.selectionHeight, cellY))

            selectionRectangle.X = INDENT + cellX * (SQSizeX + WALL_THICKNESS)
            selectionRectangle.Y = INDENT + cellY * (SQSizeY + WALL_THICKNESS)
            selectionRectangle.Width = selectionData.selectionWidth * (SQSizeX + WALL_THICKNESS) - WALL_THICKNESS
            selectionRectangle.Height = selectionData.selectionHeight * (SQSizeY + WALL_THICKNESS) - WALL_THICKNESS

            picGame.Invalidate()
        ElseIf isInSelectionMode Then
            If isSelecting Then
                selectionEndPoint = e.Location
                selectionRectangle = GetRectangle(selectionStartPoint, selectionEndPoint)
                picGame.Invalidate()
            End If
        Else
            If isDraggingItem Then
                mouseX = e.X
                mouseY = e.Y
                UpdateHighlight(e.X, e.Y)
                picGame.Invalidate()
            Else
                mouseX = e.X
                mouseY = e.Y
                UpdateHighlight(e.X, e.Y)
                picGame.Invalidate()
                If isRightMouseDown Then
                    If rdoEdge.Checked Then
                        UpdateHighlight(e.X, e.Y)
                        If isMouseInsideGrid Then
                            RemoveEdgeStyleAtMousePosition(e.X, e.Y)
                        End If
                    Else
                        Dim deltaX As Integer = e.X - rightMouseDownPosition.X
                        Dim deltaY As Integer = e.Y - rightMouseDownPosition.Y
                        Dim distanceSquared As Integer = deltaX * deltaX + deltaY * deltaY
                        If distanceSquared > CLICK_DRAG_THRESHOLD_SQUARED Then
                            RemoveObjectAtMousePosition(e.X, e.Y, removeWalls:=True, removeItems:=False)
                        End If
                    End If
                End If
                If isLeftMouseDown Then
                    If rdoEdge.Checked Then
                        UpdateHighlight(e.X, e.Y)
                        If isMouseInsideGrid Then
                            SetEdgeStyleAtMousePosition(e.X, e.Y)
                        End If
                    Else
                        AddWallAtMousePosition(e.X, e.Y)
                    End If
                End If
            End If
        End If

        If isCopying Then
            Dim newX As Integer = e.X - selectionOffset.X
            Dim newY As Integer = e.Y - selectionOffset.Y

            Dim cellX As Integer = (newX - INDENT + (SQSizeX + WALL_THICKNESS) \ 2) \ (SQSizeX + WALL_THICKNESS)
            Dim cellY As Integer = (newY - INDENT + (SQSizeY + WALL_THICKNESS) \ 2) \ (SQSizeY + WALL_THICKNESS)

            cellX = Math.Max(0, Math.Min(SQCOUNTX - copiedSelectionData.selectionWidth, cellX))
            cellY = Math.Max(0, Math.Min(SQCOUNTY - copiedSelectionData.selectionHeight, cellY))

            selectionRectangle.X = INDENT + cellX * (SQSizeX + WALL_THICKNESS)
            selectionRectangle.Y = INDENT + cellY * (SQSizeY + WALL_THICKNESS)
            selectionRectangle.Width = copiedSelectionData.selectionWidth * (SQSizeX + WALL_THICKNESS) - WALL_THICKNESS
            selectionRectangle.Height = copiedSelectionData.selectionHeight * (SQSizeY + WALL_THICKNESS) - WALL_THICKNESS

            picGame.Invalidate()
        End If

        UpdateStatusBar(e.X, e.Y)
    End Sub

    Private Sub UpdateStatusBar(pixelX As Integer, pixelY As Integer)
        Dim squareX As Integer = (pixelX - INDENT + (SQSizeX + WALL_THICKNESS) \ 2) \ (SQSizeX + WALL_THICKNESS)
        Dim squareY As Integer = (pixelY - INDENT + (SQSizeY + WALL_THICKNESS) \ 2) \ (SQSizeY + WALL_THICKNESS)

        squareX = Math.Max(0, Math.Min(SQCOUNTX - 1, squareX))
        squareY = Math.Max(0, Math.Min(SQCOUNTY - 1, squareY))

        Dim isOverWall As Boolean = highlightedWallX OrElse highlightedWallY

        Dim content As String = "Empty"
        If isOverWall Then
            If highlightedWallX Then
                If highlightedX >= 0 AndAlso highlightedX < verticalWallItems.Length AndAlso
           highlightedY >= 0 AndAlso highlightedY < verticalWallItems(0).Length Then
                    If verticalWallItems(highlightedX)(highlightedY) IsNot Nothing Then
                        content = GetItemName(verticalWallItems(highlightedX)(highlightedY).ImageKey)
                    ElseIf verticalWalls(highlightedX)(highlightedY) Then
                        content = "Wall"
                    End If
                End If
            ElseIf highlightedWallY Then
                If highlightedX >= 0 AndAlso highlightedX < horizontalWallItems.Length AndAlso
           highlightedY >= 0 AndAlso highlightedY < horizontalWallItems(0).Length Then
                    If horizontalWallItems(highlightedX)(highlightedY) IsNot Nothing Then
                        content = GetItemName(horizontalWallItems(highlightedX)(highlightedY).ImageKey)
                    ElseIf horizontalWalls(highlightedX)(highlightedY) Then
                        content = "Wall"
                    End If
                End If
            End If
        Else
            If highlightedX >= 0 AndAlso highlightedX < placedItems.Length AndAlso
       highlightedY >= 0 AndAlso highlightedY < placedItems(0).Length Then
                If placedItems(highlightedX)(highlightedY) IsNot Nothing Then
                    content = GetItemName(placedItems(highlightedX)(highlightedY).ImageKey)
                ElseIf floorsUseEdgeStyle(highlightedX)(highlightedY) Then
                    content = "Edge"
                End If
            End If
        End If

        If isOverWall Then
            stb.Text = "Location: " & pixelX & ", " & pixelY & " | Wall: " & squareX & ", " & squareY & " | " & content
        Else
            stb.Text = "Location: " & pixelX & ", " & pixelY & " | Square: " & squareX & ", " & squareY & " | " & content
        End If
    End Sub

    Private Function GetItemName(imageKey As String) As String
        Select Case imageKey
            Case "picBlock1"
                Return "Block"
            Case "picBaddy1"
                Return "Baddy1"
            Case "picBaddy2"
                Return "Baddy2"
            Case "picLazer1"
                Return "Lazer1"
            Case "picLazer2"
                Return "Lazer2"
            Case "picFlipper1"
                Return "Flipper1"
            Case "picFlipper2"
                Return "Flipper2"
            Case "picFlipper3"
                Return "Flipper3"
            Case "picFlipper4"
                Return "Flipper4"
            Case "picBaddy3"
                Return "Baddy3"
            Case "picBaddy4"
                Return "Baddy4"
            Case "picCoin"
                Return "Coin"
            Case "picGate"
                Return "Gate"
            Case "picKey"
                Return "Key"
            Case "picStart"
                Return "Start"
            Case "picFinish"
                Return "Finish"
            Case "picBlockStopper1"
                Return "BlockStopper"
            Case "picBall"
                Return "Ball"
            Case "picBlockSwitch"
                Return "BlockSwitch"
            Case "picBomb"
                Return "Bomb"
            Case "picWarp"
                Return "Warp"
            Case "picWarp2"
                Return "Warp2"
            Case Else
                Return "Unknown"
        End Select
    End Function

    Private Sub RemoveEdgeStyleAtMousePosition(mouseX As Integer, mouseY As Integer)
        UpdateHighlight(mouseX, mouseY)
        If Not highlightedWallX AndAlso Not highlightedWallY Then
            If highlightedX >= 0 AndAlso highlightedX < SQCOUNTX AndAlso highlightedY >= 0 AndAlso highlightedY < SQCOUNTY Then
                floorsUseEdgeStyle(highlightedX)(highlightedY) = False
                picGame.Invalidate()
            End If
        End If
    End Sub

    Private Function IsLazerItem(imgKey As String) As Boolean
        Return imgKey = "picLazer1" OrElse imgKey = "picLazer2"
    End Function

    Private Sub PicGame_MouseUp(sender As Object, e As MouseEventArgs) Handles picGame.MouseUp
        If isDraggingSelection Then
            If e.Button = MouseButtons.Left Then
                isDraggingSelection = False
                picGame.Capture = False
                Cursor = Cursors.Default

                Dim newCellX As Integer = (selectionRectangle.X - INDENT + WALL_THICKNESS \ 2) \ (SQSizeX + WALL_THICKNESS)
                Dim newCellY As Integer = (selectionRectangle.Y - INDENT + WALL_THICKNESS \ 2) \ (SQSizeY + WALL_THICKNESS)

                newCellX = Math.Max(0, Math.Min(SQCOUNTX - selectionData.selectionWidth, newCellX))
                newCellY = Math.Max(0, Math.Min(SQCOUNTY - selectionData.selectionHeight, newCellY))

                ClearSelectionDataAt(selectionStartCell.X, selectionStartCell.Y)
                MoveSelectionDataTo(newCellX, newCellY)

                selectionRectangle = Rectangle.Empty
                isSelectionReadyToDrag = False
                isInSelectionMode = False
                Cursor = Cursors.Default
                picGame.Invalidate()

                If Not isRestoringState Then SaveStateForUndo()
            ElseIf e.Button = MouseButtons.Right Then
                isDraggingSelection = False
                picGame.Capture = False
                Cursor = Cursors.Default

                selectionRectangle = New Rectangle(
            INDENT + selectionStartCell.X * (SQSizeX + WALL_THICKNESS),
            INDENT + selectionStartCell.Y * (SQSizeY + WALL_THICKNESS),
            selectionData.selectionWidth * (SQSizeX + WALL_THICKNESS) - WALL_THICKNESS,
            selectionData.selectionHeight * (SQSizeY + WALL_THICKNESS) - WALL_THICKNESS)

                isSelectionReadyToDrag = False
                isInSelectionMode = False
                Cursor = Cursors.Default
                picGame.Invalidate()
            End If
        ElseIf isInSelectionMode Then
            If isSelecting AndAlso e.Button = MouseButtons.Left Then
                isSelecting = False
                selectionEndPoint = e.Location
                selectionRectangle = GetRectangle(selectionStartPoint, selectionEndPoint)
                picGame.Invalidate()

                If Not selectionRectangle.IsEmpty AndAlso Not isCopying Then
                    Dim menuPosition As Point = e.Location
                    ctmMenu.Show(picGame, menuPosition)
                Else
                    isInSelectionMode = False
                    Cursor = Cursors.Default
                End If
            End If
        Else
            If e.Button = MouseButtons.Left Then
                If isDraggingItem Then
                    isDraggingItem = False
                    picGame.Capture = False
                    Cursor.Current = Cursors.Default

                    If isMouseInsideGrid Then
                        If highlightedWallX AndAlso draggedItemIsWall AndAlso draggedItemIsVerticalWall Then
                            If highlightedX >= 0 AndAlso highlightedX < verticalWallItems.Length AndAlso
                   verticalWallItems(highlightedX) IsNot Nothing AndAlso
                   highlightedY >= 0 AndAlso highlightedY < verticalWallItems(0).Length Then

                                If IsFlipperItem(draggedItem.ImageKey) Then
                                    If (highlightedX = 0 AndAlso draggedItem.ImageKey = "picFlipper2") OrElse
                           (highlightedX = SQCOUNTX AndAlso draggedItem.ImageKey = "picFlipper1") OrElse
                           (highlightedY = 0 AndAlso draggedItem.ImageKey = "picFlipper4") OrElse
                           (highlightedY = SQCOUNTY AndAlso draggedItem.ImageKey = "picFlipper3") Then
                                        verticalWallItems(highlightedX)(highlightedY) = draggedItem
                                        verticalWalls(highlightedX)(highlightedY) = False
                                    End If
                                End If
                            End If
                        ElseIf highlightedWallY AndAlso draggedItemIsWall AndAlso Not draggedItemIsVerticalWall Then
                            If highlightedX >= 0 AndAlso highlightedX < horizontalWallItems.Length AndAlso
                   horizontalWallItems(highlightedX) IsNot Nothing AndAlso
                   highlightedY >= 0 AndAlso highlightedY < horizontalWallItems(0).Length Then

                                If IsFlipperItem(draggedItem.ImageKey) Then
                                    If (highlightedX = 0 AndAlso draggedItem.ImageKey = "picFlipper2") OrElse
                           (highlightedX = SQCOUNTX AndAlso draggedItem.ImageKey = "picFlipper1") OrElse
                           (highlightedY = 0 AndAlso draggedItem.ImageKey = "picFlipper4") OrElse
                           (highlightedY = SQCOUNTY AndAlso draggedItem.ImageKey = "picFlipper3") Then
                                        horizontalWallItems(highlightedX)(highlightedY) = draggedItem
                                        horizontalWalls(highlightedX)(highlightedY) = False
                                    End If
                                End If
                            End If
                        ElseIf Not highlightedWallX AndAlso Not highlightedWallY AndAlso Not draggedItemIsWall Then
                            If highlightedX >= 0 AndAlso highlightedX < placedItems.Length AndAlso
                   placedItems(highlightedX) IsNot Nothing AndAlso
                   highlightedY >= 0 AndAlso highlightedY < placedItems(0).Length Then

                                placedItems(highlightedX)(highlightedY) = draggedItem
                            End If
                        Else
                            ReturnItemToOriginalLocation()
                        End If
                    Else
                        ReturnItemToOriginalLocation()
                    End If
                Else
                    isLeftMouseDown = False
                    If isActionInProgress Then
                        isActionInProgress = False
                        redoStack.Clear()
                    End If
                End If
            ElseIf e.Button = MouseButtons.Right Then
                isRightMouseDown = False
                If isActionInProgress Then
                    isActionInProgress = False
                    redoStack.Clear()
                End If

                If rdoEdge.Checked Then
                    UpdateHighlight(e.X, e.Y)
                    If isMouseInsideGrid Then
                        If Not highlightedWallX AndAlso Not highlightedWallY Then
                            If highlightedX >= 0 AndAlso highlightedX < SQCOUNTX AndAlso
                   highlightedY >= 0 AndAlso highlightedY < SQCOUNTY Then
                                floorsUseEdgeStyle(highlightedX)(highlightedY) = False
                                picGame.Invalidate()
                            End If
                        End If
                    End If
                Else
                    Dim deltaX As Integer = e.X - rightMouseDownPosition.X
                    Dim deltaY As Integer = e.Y - rightMouseDownPosition.Y
                    Dim distanceSquared As Integer = deltaX * deltaX + deltaY * deltaY
                    If distanceSquared < CLICK_DRAG_THRESHOLD_SQUARED Then
                        RemoveObjectAtMousePosition(e.X, e.Y, removeWalls:=False, removeItems:=True)
                    End If
                End If
            End If
        End If

        If isCopying Then
            If e.Button = MouseButtons.Left Then
                isCopying = False
                picGame.Capture = False
                Cursor = Cursors.Default

                Dim newCellX As Integer = (selectionRectangle.X - INDENT + WALL_THICKNESS \ 2) \ (SQSizeX + WALL_THICKNESS)
                Dim newCellY As Integer = (selectionRectangle.Y - INDENT + WALL_THICKNESS \ 2) \ (SQSizeY + WALL_THICKNESS)

                newCellX = Math.Max(0, Math.Min(SQCOUNTX - copiedSelectionData.selectionWidth, newCellX))
                newCellY = Math.Max(0, Math.Min(SQCOUNTY - copiedSelectionData.selectionHeight, newCellY))

                PasteSelectionData(newCellX, newCellY, copiedSelectionType)

                selectionRectangle = Rectangle.Empty
                isInSelectionMode = False
                Cursor = Cursors.Default
                picGame.Invalidate()

                If Not isRestoringState Then SaveStateForUndo()
            End If
        End If
    End Sub


    Private Sub CaptureSelectionData()
        Dim startCellX As Integer = (selectionRectangle.X - INDENT + WALL_THICKNESS \ 2) \ (SQSizeX + WALL_THICKNESS)
        Dim startCellY As Integer = (selectionRectangle.Y - INDENT + WALL_THICKNESS \ 2) \ (SQSizeY + WALL_THICKNESS)
        Dim endCellX As Integer = ((selectionRectangle.Right - INDENT - WALL_THICKNESS \ 2 - 1)) \ (SQSizeX + WALL_THICKNESS)
        Dim endCellY As Integer = ((selectionRectangle.Bottom - INDENT - WALL_THICKNESS \ 2 - 1)) \ (SQSizeY + WALL_THICKNESS)

        startCellX = Math.Max(0, Math.Min(SQCOUNTX - 1, startCellX))
        startCellY = Math.Max(0, Math.Min(SQCOUNTY - 1, startCellY))
        endCellX = Math.Max(0, Math.Min(SQCOUNTX - 1, endCellX))
        endCellY = Math.Max(0, Math.Min(SQCOUNTY - 1, endCellY))

        Dim selectionWidth As Integer = endCellX - startCellX + 1
        Dim selectionHeight As Integer = endCellY - startCellY + 1

        selectionData = New SelectionData()
        selectionData.selectionWidth = selectionWidth
        selectionData.selectionHeight = selectionHeight

        selectionData.placedItems = New PlacedItem(selectionWidth - 1)() {}
        selectionData.floorsUseEdgeStyle = New Boolean(selectionWidth - 1)() {}
        For x As Integer = 0 To selectionWidth - 1
            selectionData.placedItems(x) = New PlacedItem(selectionHeight - 1) {}
            selectionData.floorsUseEdgeStyle(x) = New Boolean(selectionHeight - 1) {}
        Next

        Dim verticalWallsWidth As Integer = selectionWidth + 1
        Dim verticalWallsHeight As Integer = selectionHeight
        selectionData.verticalWalls = New Boolean(verticalWallsWidth - 1)() {}
        selectionData.verticalWallItems = New PlacedItem(verticalWallsWidth - 1)() {}
        For x As Integer = 0 To verticalWallsWidth - 1
            selectionData.verticalWalls(x) = New Boolean(verticalWallsHeight - 1) {}
            selectionData.verticalWallItems(x) = New PlacedItem(verticalWallsHeight - 1) {}
        Next

        Dim horizontalWallsWidth As Integer = selectionWidth
        Dim horizontalWallsHeight As Integer = selectionHeight + 1
        selectionData.horizontalWalls = New Boolean(horizontalWallsWidth - 1)() {}
        selectionData.horizontalWallItems = New PlacedItem(horizontalWallsWidth - 1)() {}
        For x As Integer = 0 To horizontalWallsWidth - 1
            selectionData.horizontalWalls(x) = New Boolean(horizontalWallsHeight - 1) {}
            selectionData.horizontalWallItems(x) = New PlacedItem(horizontalWallsHeight - 1) {}
        Next

        For x As Integer = 0 To selectionWidth - 1
            For y As Integer = 0 To selectionHeight - 1
                selectionData.placedItems(x)(y) = placedItems(startCellX + x)(startCellY + y)
                selectionData.floorsUseEdgeStyle(x)(y) = floorsUseEdgeStyle(startCellX + x)(startCellY + y)
            Next
        Next

        For x As Integer = 0 To verticalWallsWidth - 1
            For y As Integer = 0 To verticalWallsHeight - 1
                selectionData.verticalWalls(x)(y) = verticalWalls(startCellX + x)(startCellY + y)
                selectionData.verticalWallItems(x)(y) = verticalWallItems(startCellX + x)(startCellY + y)
            Next
        Next

        For x As Integer = 0 To horizontalWallsWidth - 1
            For y As Integer = 0 To horizontalWallsHeight - 1
                selectionData.horizontalWalls(x)(y) = horizontalWalls(startCellX + x)(startCellY + y)
                selectionData.horizontalWallItems(x)(y) = horizontalWallItems(startCellX + x)(startCellY + y)
            Next
        Next

        selectionStartCell = New Point(startCellX, startCellY)
    End Sub

    Private Sub MoveSelectionDataTo(newCellX As Integer, newCellY As Integer)
        For x As Integer = 0 To selectionData.selectionWidth - 1
            For y As Integer = 0 To selectionData.selectionHeight - 1
                If newCellX + x >= 0 AndAlso newCellX + x < SQCOUNTX AndAlso newCellY + y >= 0 AndAlso newCellY + y < SQCOUNTY Then
                    placedItems(newCellX + x)(newCellY + y) = selectionData.placedItems(x)(y)
                    floorsUseEdgeStyle(newCellX + x)(newCellY + y) = selectionData.floorsUseEdgeStyle(x)(y)
                End If
            Next
        Next

        For x As Integer = 0 To selectionData.verticalWalls.Length - 1
            For y As Integer = 0 To selectionData.verticalWalls(0).Length - 1
                If newCellX + x >= 0 AndAlso newCellX + x < verticalWalls.Length AndAlso newCellY + y >= 0 AndAlso newCellY + y < verticalWalls(0).Length Then
                    verticalWalls(newCellX + x)(newCellY + y) = selectionData.verticalWalls(x)(y)
                    verticalWallItems(newCellX + x)(newCellY + y) = selectionData.verticalWallItems(x)(y)
                End If
            Next
        Next

        For x As Integer = 0 To selectionData.horizontalWalls.Length - 1
            For y As Integer = 0 To selectionData.horizontalWalls(0).Length - 1
                If newCellX + x >= 0 AndAlso newCellX + x < horizontalWalls.Length AndAlso newCellY + y >= 0 AndAlso newCellY + y < horizontalWalls(0).Length Then
                    horizontalWalls(newCellX + x)(newCellY + y) = selectionData.horizontalWalls(x)(y)
                    horizontalWallItems(newCellX + x)(newCellY + y) = selectionData.horizontalWallItems(x)(y)
                End If
            Next
        Next
    End Sub

    Private Sub ClearSelectionDataAt(oldCellX As Integer, oldCellY As Integer)
        For x As Integer = 0 To selectionData.selectionWidth - 1
            For y As Integer = 0 To selectionData.selectionHeight - 1
                If oldCellX + x >= 0 AndAlso oldCellX + x < SQCOUNTX AndAlso oldCellY + y >= 0 AndAlso oldCellY + y < SQCOUNTY Then
                    placedItems(oldCellX + x)(oldCellY + y) = Nothing
                    floorsUseEdgeStyle(oldCellX + x)(oldCellY + y) = False
                End If
            Next
        Next

        For x As Integer = 0 To selectionData.verticalWalls.Length - 1
            For y As Integer = 0 To selectionData.verticalWalls(0).Length - 1
                If oldCellX + x >= 0 AndAlso oldCellX + x < verticalWalls.Length AndAlso oldCellY + y >= 0 AndAlso oldCellY + y < verticalWalls(0).Length Then
                    verticalWalls(oldCellX + x)(oldCellY + y) = True
                    verticalWallItems(oldCellX + x)(oldCellY + y) = Nothing
                End If
            Next
        Next

        For x As Integer = 0 To selectionData.horizontalWalls.Length - 1
            For y As Integer = 0 To selectionData.horizontalWalls(0).Length - 1
                If oldCellX + x >= 0 AndAlso oldCellX + x < horizontalWalls.Length AndAlso oldCellY + y >= 0 AndAlso oldCellY + y < horizontalWalls(0).Length Then
                    horizontalWalls(oldCellX + x)(oldCellY + y) = True
                    horizontalWallItems(oldCellX + x)(oldCellY + y) = Nothing
                End If
            Next
        Next
    End Sub

    Private Sub DrawSelectionData(g As Graphics, baseCellX As Integer, baseCellY As Integer)
        Dim xOrigin As Integer = INDENT
        Dim yOrigin As Integer = INDENT

        Dim colorMatrix As New Imaging.ColorMatrix()
        colorMatrix.Matrix33 = 0.5F
        Dim imgAttributes As New Imaging.ImageAttributes()
        imgAttributes.SetColorMatrix(colorMatrix, Imaging.ColorMatrixFlag.Default, Imaging.ColorAdjustType.Bitmap)

        For x As Integer = 0 To selectionData.selectionWidth - 1
            For y As Integer = 0 To selectionData.selectionHeight - 1
                If selectionData.placedItems(x)(y) IsNot Nothing Then
                    Dim img As Image = GetImageByKey(selectionData.placedItems(x)(y).ImageKey)
                    If img IsNot Nothing Then
                        ImageAnimator.UpdateFrames(img)
                        Dim xPos As Integer = xOrigin + (baseCellX + x) * (SQSizeX + WALL_THICKNESS) + WALL_THICKNESS \ 2
                        Dim yPos As Integer = yOrigin + (baseCellY + y) * (SQSizeY + WALL_THICKNESS) + WALL_THICKNESS \ 2
                        Dim destRect As New Rectangle(xPos, yPos, SQSizeX, SQSizeY)
                        g.DrawImage(img, destRect, 0, 0, img.Width, img.Height, GraphicsUnit.Pixel, imgAttributes)
                    End If
                End If
            Next
        Next
    End Sub

    Public Sub UpdateGridSizeUI()
        RemoveHandler cboX.SelectedIndexChanged, AddressOf cboX_SelectedIndexChanged
        RemoveHandler cboY.SelectedIndexChanged, AddressOf cboY_SelectedIndexChanged

        If Not cboX.Items.Contains(SQCOUNTX.ToString()) Then
            cboX.Items.Add(SQCOUNTX.ToString())
        End If
        cboX.SelectedItem = SQCOUNTX.ToString()

        If Not cboY.Items.Contains(SQCOUNTY.ToString()) Then
            cboY.Items.Add(SQCOUNTY.ToString())
        End If
        cboY.SelectedItem = SQCOUNTY.ToString()

        AddHandler cboX.SelectedIndexChanged, AddressOf cboX_SelectedIndexChanged
        AddHandler cboY.SelectedIndexChanged, AddressOf cboY_SelectedIndexChanged

        CalculateSquareSizes(picGame.ClientSize.Width, picGame.ClientSize.Height)

        picGame.Invalidate()
    End Sub

#End Region

#Region " Utility and Helper Methods "

    Private Function IsHorizontalWallConnectedToEdge(pt As Point) As Boolean
        Dim x As Integer = pt.X
        Dim y As Integer = pt.Y

        If y > 0 AndAlso floorsUseEdgeStyle(x)(y - 1) Then Return True
        If y < SQCOUNTY AndAlso floorsUseEdgeStyle(x)(y) Then Return True

        Return False
    End Function

    Private Function IsVerticalWallConnectedToEdge(pt As Point) As Boolean
        Dim x As Integer = pt.X
        Dim y As Integer = pt.Y

        If x > 0 AndAlso floorsUseEdgeStyle(x - 1)(y) Then Return True
        If x < SQCOUNTX AndAlso floorsUseEdgeStyle(x)(y) Then Return True

        Return False
    End Function

    Private Sub CalculateSquareSizes(clientWidth As Integer, clientHeight As Integer)
        If SQCOUNTX <= 0 OrElse SQCOUNTY <= 0 Then
            Throw New InvalidOperationException("Grid dimensions must be greater than zero.")
        End If

        SQSizeX = (clientWidth - 2 * INDENT - (SQCOUNTX + 1) * WALL_THICKNESS) \ SQCOUNTX
        SQSizeY = (clientHeight - 2 * INDENT - (SQCOUNTY + 1) * WALL_THICKNESS) \ SQCOUNTY
    End Sub

    Private Sub DrawGrid(g As Graphics)
        Dim xOrigin As Integer = INDENT
        Dim yOrigin As Integer = INDENT

        DrawGradientBackground(g)

        For x As Integer = 0 To SQCOUNTX - 1
            For y As Integer = 0 To SQCOUNTY - 1
                Dim floorRect As New Rectangle(
            xOrigin + x * (SQSizeX + WALL_THICKNESS) + WALL_THICKNESS \ 2,
            yOrigin + y * (SQSizeY + WALL_THICKNESS) + WALL_THICKNESS \ 2,
            SQSizeX,
            SQSizeY
        )

                If floorsUseEdgeStyle(x)(y) Then
                    Using floorBrush As New HatchBrush(wallsHatchStyle, wallsColor1, wallsColor2)
                        g.FillRectangle(floorBrush, floorRect)
                    End Using
                ElseIf useGradient Then
                    Using hatchBrush As New HatchBrush(floorsHatchStyle, Color.Transparent, Color.Transparent)
                        g.FillRectangle(hatchBrush, floorRect)
                    End Using
                Else
                    Using floorBrush As New HatchBrush(floorsHatchStyle, floorsColor1, floorsColor2)
                        g.FillRectangle(floorBrush, floorRect)
                    End Using
                End If
            Next
        Next

        For x As Integer = 0 To SQCOUNTX
            For y As Integer = 0 To SQCOUNTY
                Dim intersectionRect As New Rectangle(
            xOrigin + x * (SQSizeX + WALL_THICKNESS) - WALL_THICKNESS \ 2,
            yOrigin + y * (SQSizeY + WALL_THICKNESS) - WALL_THICKNESS \ 2,
            WALL_THICKNESS,
            WALL_THICKNESS
        )

                Using wallBrush As New HatchBrush(wallsHatchStyle, wallsColor1, wallsColor2)
                    g.FillRectangle(wallBrush, intersectionRect)
                End Using
            Next
        Next

        For x As Integer = 0 To SQCOUNTX
            For y As Integer = 0 To SQCOUNTY - 1
                Dim wallRect As New Rectangle(
            xOrigin + x * (SQSizeX + WALL_THICKNESS) - WALL_THICKNESS \ 2,
            yOrigin + y * (SQSizeY + WALL_THICKNESS) + WALL_THICKNESS \ 2,
            WALL_THICKNESS,
            SQSizeY
        )

                If x >= 0 AndAlso x < verticalWalls.Length AndAlso
           verticalWalls(x) IsNot Nothing AndAlso
           y >= 0 AndAlso y < verticalWalls(0).Length Then

                    If verticalWalls(x)(y) Then
                        Using wallBrush As New HatchBrush(wallsHatchStyle, wallsColor1, wallsColor2)
                            g.FillRectangle(wallBrush, wallRect)
                        End Using
                    ElseIf useGradient Then
                        Using hatchBrush As New HatchBrush(floorsHatchStyle, Color.Transparent, Color.Transparent)
                            g.FillRectangle(hatchBrush, wallRect)
                        End Using
                    Else
                        Using floorBrush As New HatchBrush(floorsHatchStyle, floorsColor1, floorsColor2)
                            g.FillRectangle(floorBrush, wallRect)
                        End Using
                    End If
                End If
            Next
        Next

        For x As Integer = 0 To SQCOUNTX - 1
            For y As Integer = 0 To SQCOUNTY
                Dim wallRect As New Rectangle(
            xOrigin + x * (SQSizeX + WALL_THICKNESS) + WALL_THICKNESS \ 2,
            yOrigin + y * (SQSizeY + WALL_THICKNESS) - WALL_THICKNESS \ 2,
            SQSizeX,
            WALL_THICKNESS
        )

                If x >= 0 AndAlso x < horizontalWalls.Length AndAlso
           horizontalWalls(x) IsNot Nothing AndAlso
           y >= 0 AndAlso y < horizontalWalls(0).Length Then

                    If horizontalWalls(x)(y) Then
                        Using wallBrush As New HatchBrush(wallsHatchStyle, wallsColor1, wallsColor2)
                            g.FillRectangle(wallBrush, wallRect)
                        End Using
                    ElseIf useGradient Then
                        Using hatchBrush As New HatchBrush(floorsHatchStyle, Color.Transparent, Color.Transparent)
                            g.FillRectangle(hatchBrush, wallRect)
                        End Using
                    Else
                        Using floorBrush As New HatchBrush(floorsHatchStyle, floorsColor1, floorsColor2)
                            g.FillRectangle(floorBrush, wallRect)
                        End Using
                    End If
                End If
            Next
        Next

        DrawItems(g)
        DrawWallItems(g)

        DrawGridNumbers(g)
    End Sub

    Private Sub DrawGridNumbers(g As Graphics)
        Dim xOrigin As Integer = INDENT
        Dim yOrigin As Integer = INDENT
        Dim font As New Font("Arial", 10, FontStyle.Regular)
        Dim brush As New SolidBrush(Color.Black)

        Dim columnNumberOffsetY As Single = -20.0F
        Dim rowNumberOffsetX As Single = -5.0F

        For x As Integer = 0 To SQCOUNTX - 1
            Dim xPos As Single = xOrigin + x * (SQSizeX + WALL_THICKNESS) + WALL_THICKNESS \ 2 + CSng(SQSizeX) / 2
            Dim yPos As Single = yOrigin + columnNumberOffsetY

            Dim label As String = x.ToString()
            Dim xLabelSize As SizeF = g.MeasureString(label, font)
            g.DrawString(label, font, brush, xPos - xLabelSize.Width / 2.0F, yPos)
        Next

        For y As Integer = 0 To SQCOUNTY - 1
            Dim xPos As Single = xOrigin + rowNumberOffsetX
            Dim yPos As Single = yOrigin + y * (SQSizeY + WALL_THICKNESS) + WALL_THICKNESS \ 2 + CSng(SQSizeY) / 2

            Dim label As String = y.ToString()
            Dim yLabelSize As SizeF = g.MeasureString(label, font)
            g.DrawString(label, font, brush, xPos - yLabelSize.Width, yPos - yLabelSize.Height / 2.0F)
        Next

        font.Dispose()
        brush.Dispose()
    End Sub

    Friend Sub FillBorderWalls()
        For y As Integer = 0 To SQCOUNTY - 1
            verticalWalls(0)(y) = True
            verticalWalls(SQCOUNTX)(y) = True
        Next

        For x As Integer = 0 To SQCOUNTX - 1
            horizontalWalls(x)(0) = True
            horizontalWalls(x)(SQCOUNTY) = True
        Next
    End Sub

    Private Sub DrawItems(g As Graphics)
        For x As Integer = 0 To placedItems.Length - 1
            If placedItems(x) IsNot Nothing Then
                For y As Integer = 0 To placedItems(x).Length - 1
                    If placedItems(x)(y) IsNot Nothing Then
                        Dim img As Image = GetImageByKey(placedItems(x)(y).ImageKey)
                        If img IsNot Nothing Then
                            ImageAnimator.UpdateFrames(img)
                            Dim xPos As Integer = INDENT + x * (SQSizeX + WALL_THICKNESS) + WALL_THICKNESS \ 2
                            Dim yPos As Integer = INDENT + y * (SQSizeY + WALL_THICKNESS) + WALL_THICKNESS \ 2
                            Dim destRect As New Rectangle(xPos, yPos, SQSizeX, SQSizeY)

                            Dim imgAttributes As New Imaging.ImageAttributes()
                            imgAttributes.SetWrapMode(WrapMode.TileFlipXY)
                            g.DrawImage(img, destRect, 0, 0, img.Width, img.Height, GraphicsUnit.Pixel, imgAttributes)
                        End If
                    End If
                Next
            End If
        Next
    End Sub

    Private Sub DrawWallItems(g As Graphics)
        For x As Integer = 0 To verticalWallItems.Length - 1
            If verticalWallItems(x) IsNot Nothing Then
                For y As Integer = 0 To verticalWallItems(x).Length - 1
                    If verticalWallItems(x)(y) IsNot Nothing Then
                        Dim img As Image = GetImageByKey(verticalWallItems(x)(y).ImageKey)
                        If img IsNot Nothing Then
                            ImageAnimator.UpdateFrames(img)
                            Dim wallX As Integer = INDENT + x * (SQSizeX + WALL_THICKNESS) - (WALL_THICKNESS \ 2)
                            Dim wallY As Integer = INDENT + y * (SQSizeY + WALL_THICKNESS) + (WALL_THICKNESS \ 2)
                            Dim wallWidth As Integer = WALL_THICKNESS
                            Dim wallHeight As Integer = SQSizeY

                            Dim newWidth As Integer = img.Width
                            Dim newHeight As Integer = wallHeight

                            Dim centeredX As Integer = wallX + (wallWidth - newWidth) \ 2
                            Dim drawRect As New Rectangle(centeredX, wallY, newWidth, newHeight)
                            g.DrawImage(img, drawRect)
                        End If
                    End If
                Next
            End If
        Next

        For x As Integer = 0 To horizontalWallItems.Length - 1
            If horizontalWallItems(x) IsNot Nothing Then
                For y As Integer = 0 To horizontalWallItems(x).Length - 1
                    If horizontalWallItems(x)(y) IsNot Nothing Then
                        Dim img As Image = GetImageByKey(horizontalWallItems(x)(y).ImageKey)
                        If img IsNot Nothing Then
                            ImageAnimator.UpdateFrames(img)
                            Dim wallX As Integer = INDENT + x * (SQSizeX + WALL_THICKNESS) + (WALL_THICKNESS \ 2)
                            Dim wallY As Integer = INDENT + y * (SQSizeY + WALL_THICKNESS) - (WALL_THICKNESS \ 2)
                            Dim wallWidth As Integer = SQSizeX
                            Dim wallHeight As Integer = WALL_THICKNESS

                            Dim newWidth As Integer = wallWidth
                            Dim newHeight As Integer = img.Height

                            Dim centeredY As Integer = wallY + (wallHeight - newHeight) \ 2
                            Dim drawRect As New Rectangle(wallX, centeredY, newWidth, newHeight)
                            g.DrawImage(img, drawRect)
                        End If
                    End If
                Next
            End If
        Next
    End Sub

    Private Sub DrawHighlight(g As Graphics)
        If Not isMouseInsideGrid OrElse highlightedX < 0 OrElse highlightedY < 0 Then
            Return
        End If

        Using highlightPen As New Pen(highlightColor, 2) With {.DashStyle = DashStyle.Dash}
            If highlightedWallX Then
                Dim x As Integer = INDENT + highlightedX * (SQSizeX + WALL_THICKNESS) - WALL_THICKNESS \ 2
                Dim y As Integer = INDENT + highlightedY * (SQSizeY + WALL_THICKNESS) + WALL_THICKNESS \ 2
                Dim rect As New Rectangle(x, y, WALL_THICKNESS, SQSizeY)
                g.DrawRectangle(highlightPen, rect)
            ElseIf highlightedWallY Then
                Dim x As Integer = INDENT + highlightedX * (SQSizeX + WALL_THICKNESS) + WALL_THICKNESS \ 2
                Dim y As Integer = INDENT + highlightedY * (SQSizeY + WALL_THICKNESS) - WALL_THICKNESS \ 2
                Dim rect As New Rectangle(x, y, SQSizeX, WALL_THICKNESS)
                g.DrawRectangle(highlightPen, rect)
            Else
                Dim x As Integer = INDENT + highlightedX * (SQSizeX + WALL_THICKNESS) + WALL_THICKNESS \ 2
                Dim y As Integer = INDENT + highlightedY * (SQSizeY + WALL_THICKNESS) + WALL_THICKNESS \ 2
                Dim rect As New Rectangle(x, y, SQSizeX, SQSizeY)
                g.DrawRectangle(highlightPen, rect)
            End If
        End Using
    End Sub

    Private Sub UpdateHighlight(mouseX As Integer, mouseY As Integer)
        mouseX -= INDENT
        mouseY -= INDENT

        isMouseInsideGrid = False
        highlightedWallX = False
        highlightedWallY = False
        highlightedX = -1
        highlightedY = -1

        Dim cellSizeX As Integer = SQSizeX + WALL_THICKNESS
        Dim cellSizeY As Integer = SQSizeY + WALL_THICKNESS
        Dim cellX As Integer = mouseX \ cellSizeX
        Dim cellY As Integer = mouseY \ cellSizeY

        If cellX >= 0 AndAlso cellX <= SQCOUNTX AndAlso
       cellY >= 0 AndAlso cellY <= SQCOUNTY Then

            Dim offsetX As Integer = mouseX Mod cellSizeX
            Dim offsetY As Integer = mouseY Mod cellSizeY

            highlightedWallX = offsetX < WALL_THICKNESS
            highlightedWallY = offsetY < WALL_THICKNESS
            highlightedX = cellX
            highlightedY = cellY

            isMouseInsideGrid = True
        End If

        If highlightedX < 0 Then highlightedX = 0
        If highlightedX > SQCOUNTX Then highlightedX = SQCOUNTX
        If highlightedY < 0 Then highlightedY = 0
        If highlightedY > SQCOUNTY Then highlightedY = SQCOUNTY

        If highlightedWallX AndAlso (highlightedX = 0 OrElse highlightedX = SQCOUNTX) Then
            highlightedWallX = True
        End If

        If highlightedWallY AndAlso (highlightedY = 0 OrElse highlightedY = SQCOUNTY) Then
            highlightedWallY = True
        End If
    End Sub

    Private Function GetRectangle(p1 As Point, p2 As Point) As Rectangle
        Dim x As Integer = Math.Min(p1.X, p2.X)
        Dim y As Integer = Math.Min(p1.Y, p2.Y)
        Dim width As Integer = Math.Abs(p1.X - p2.X)
        Dim height As Integer = Math.Abs(p1.Y - p2.Y)
        Return New Rectangle(x, y, width, height)
    End Function

    Private Sub SetEdgeStyleAtMousePosition(mouseX As Integer, mouseY As Integer)
        UpdateHighlight(mouseX, mouseY)
        If Not highlightedWallX AndAlso Not highlightedWallY Then
            If highlightedX >= 0 AndAlso highlightedX < SQCOUNTX AndAlso highlightedY >= 0 AndAlso highlightedY < SQCOUNTY Then
                floorsUseEdgeStyle(highlightedX)(highlightedY) = True

                If highlightedX >= 0 AndAlso highlightedX < verticalWalls.Length AndAlso
           verticalWalls(highlightedX) IsNot Nothing AndAlso
           highlightedY >= 0 AndAlso highlightedY < verticalWalls(0).Length Then
                    verticalWallItems(highlightedX)(highlightedY) = Nothing
                    verticalWalls(highlightedX)(highlightedY) = True
                End If

                If highlightedX + 1 >= 0 AndAlso highlightedX + 1 < verticalWalls.Length AndAlso
           verticalWalls(highlightedX + 1) IsNot Nothing AndAlso
           highlightedY >= 0 AndAlso highlightedY < verticalWalls(0).Length Then
                    verticalWallItems(highlightedX + 1)(highlightedY) = Nothing
                    verticalWalls(highlightedX + 1)(highlightedY) = True
                End If

                If highlightedX >= 0 AndAlso highlightedX < horizontalWalls.Length AndAlso
           horizontalWalls(highlightedX) IsNot Nothing AndAlso
           highlightedY >= 0 AndAlso highlightedY < horizontalWalls(0).Length Then
                    horizontalWallItems(highlightedX)(highlightedY) = Nothing
                    horizontalWalls(highlightedX)(highlightedY) = True
                End If

                If highlightedX >= 0 AndAlso highlightedX < horizontalWalls.Length AndAlso
           horizontalWalls(highlightedX) IsNot Nothing AndAlso
           highlightedY + 1 >= 0 AndAlso highlightedY + 1 < horizontalWalls(0).Length Then
                    horizontalWallItems(highlightedX)(highlightedY + 1) = Nothing
                    horizontalWalls(highlightedX)(highlightedY + 1) = True
                End If

                picGame.Invalidate()
            End If
        End If
    End Sub

    Private Function GetCellsInRectangle(rect As Rectangle) As List(Of Point)
        Dim selectedCells As New List(Of Point)
        For x As Integer = 0 To SQCOUNTX - 1
            For y As Integer = 0 To SQCOUNTY - 1
                Dim cellRect As Rectangle = GetCellRectangle(x, y)
                If rect.IntersectsWith(cellRect) Then
                    selectedCells.Add(New Point(x, y))
                End If
            Next
        Next
        Return selectedCells
    End Function

    Private Function GetCellRectangle(x As Integer, y As Integer) As Rectangle
        Dim xOrigin As Integer = INDENT
        Dim yOrigin As Integer = INDENT
        Return New Rectangle(
        xOrigin + x * (SQSizeX + WALL_THICKNESS) + WALL_THICKNESS \ 2,
        yOrigin + y * (SQSizeY + WALL_THICKNESS) + WALL_THICKNESS \ 2,
        SQSizeX, SQSizeY)
    End Function

    Private Function GetVerticalWallsInRectangle(rect As Rectangle) As List(Of Point)
        Dim selectedWalls As New List(Of Point)
        For x As Integer = 0 To SQCOUNTX
            For y As Integer = 0 To SQCOUNTY - 1
                Dim wallRect As Rectangle = GetVerticalWallRectangle(x, y)
                If rect.IntersectsWith(wallRect) Then
                    selectedWalls.Add(New Point(x, y))
                End If
            Next
        Next
        Return selectedWalls
    End Function

    Private Function GetVerticalWallRectangle(x As Integer, y As Integer) As Rectangle
        Dim xOrigin As Integer = INDENT
        Dim yOrigin As Integer = INDENT
        Return New Rectangle(
        xOrigin + x * (SQSizeX + WALL_THICKNESS) - WALL_THICKNESS \ 2,
        yOrigin + y * (SQSizeY + WALL_THICKNESS) + WALL_THICKNESS \ 2,
        WALL_THICKNESS, SQSizeY)
    End Function

    Private Function GetHorizontalWallsInRectangle(rect As Rectangle) As List(Of Point)
        Dim selectedWalls As New List(Of Point)
        For x As Integer = 0 To SQCOUNTX - 1
            For y As Integer = 0 To SQCOUNTY
                Dim wallRect As Rectangle = GetHorizontalWallRectangle(x, y)
                If rect.IntersectsWith(wallRect) Then
                    selectedWalls.Add(New Point(x, y))
                End If
            Next
        Next
        Return selectedWalls
    End Function

    Private Function GetHorizontalWallRectangle(x As Integer, y As Integer) As Rectangle
        Dim xOrigin As Integer = INDENT
        Dim yOrigin As Integer = INDENT
        Return New Rectangle(
        xOrigin + x * (SQSizeX + WALL_THICKNESS) + WALL_THICKNESS \ 2,
        yOrigin + y * (SQSizeY + WALL_THICKNESS) - WALL_THICKNESS \ 2,
        SQSizeX, WALL_THICKNESS)
    End Function

    Private Sub AddColorPictureBoxHandlers(parent As Control)
        For Each ctrl As Control In parent.Controls
            If TypeOf ctrl Is PictureBox AndAlso ctrl.Name.StartsWith("col") Then
                AddHandler ctrl.Click, AddressOf ColorPictureBox_Click
            End If
            If ctrl.HasChildren Then
                AddColorPictureBoxHandlers(ctrl)
            End If
        Next
    End Sub

    Private Sub ColorPictureBox_Click(sender As Object, e As EventArgs)
        If Not isRestoringState Then SaveStateForUndo()
        Dim pb As PictureBox = CType(sender, PictureBox)
        Dim selectedColor As Color = pb.BackColor

        If pb.Name.StartsWith("col") Then
            Dim numStr As String = pb.Name.Substring(3)
            Dim num As Integer
            If Integer.TryParse(numStr, num) Then
                If num >= 1 AndAlso num <= 48 Then
                    If rdoFloors.Checked Then
                        floorsColor1 = selectedColor
                    ElseIf rdoWalls.Checked Then
                        wallsColor1 = selectedColor
                    ElseIf rdoEdge.Checked Then
                        wallsColor1 = selectedColor
                    End If
                ElseIf num >= 51 AndAlso num <= 98 Then
                    If rdoFloors.Checked Then
                        floorsColor2 = selectedColor
                    ElseIf rdoWalls.Checked Then
                        wallsColor2 = selectedColor
                    ElseIf rdoEdge.Checked Then
                        wallsColor2 = selectedColor
                    End If
                End If
            End If
        End If

        picGame.Invalidate()
    End Sub

    Private Sub PicBlock_MouseDown(sender As Object, e As MouseEventArgs)
        Dim pic As PictureBox = CType(sender, PictureBox)

        isDraggingItem = True
        isActionInProgress = True
        If Not isRestoringState Then SaveStateForUndo()

        ' Create a new PlacedItem with the ImageKey
        draggedItem = New PlacedItem() With {.ImageKey = pic.Name}

        ' Determine if it's a wall item
        draggedItemIsWall = IsVerticalItem(pic.Name) OrElse IsHorizontalItem(pic.Name)
        draggedItemIsVerticalWall = IsVerticalItem(pic.Name)

        ' Since it's being dragged from the toolbox, there is no original position
        draggedItemOriginalX = -1
        draggedItemOriginalY = -1

        ' Capture the mouse events at the form level
        Me.Capture = True

        Cursor.Current = Cursors.Hand

        picGame.Invalidate()
    End Sub

    Private Sub ReturnItemToOriginalLocation()
        If draggedItemIsWall Then
            If draggedItemOriginalX >= 0 AndAlso draggedItemOriginalY >= 0 Then
                If draggedItemIsVerticalWall Then
                    verticalWallItems(draggedItemOriginalX)(draggedItemOriginalY) = draggedItem
                    verticalWalls(draggedItemOriginalX)(draggedItemOriginalY) = False
                Else
                    horizontalWallItems(draggedItemOriginalX)(draggedItemOriginalY) = draggedItem
                    horizontalWalls(draggedItemOriginalX)(draggedItemOriginalY) = False
                End If
            End If
        Else
            If draggedItemOriginalX >= 0 AndAlso draggedItemOriginalY >= 0 Then
                placedItems(draggedItemOriginalX)(draggedItemOriginalY) = draggedItem
            End If
        End If
    End Sub

    Private Function GetImageByKey(imageKey As String) As Image
        Select Case imageKey
            Case "picBlock1"
                Return picBlock1.Image
            Case "picBaddy1"
                Return picBaddy1.Image
            Case "picBaddy2"
                Return picBaddy2.Image
            Case "picLazer1"
                Return picLazer1.Image
            Case "picLazer2"
                Return picLazer2.Image
            Case "picFlipper1"
                Return picFlipper1.Image
            Case "picFlipper2"
                Return picFlipper2.Image
            Case "picFlipper3"
                Return picFlipper3.Image
            Case "picFlipper4"
                Return picFlipper4.Image
            Case "picBaddy3"
                Return picBaddy3.Image
            Case "picBaddy4"
                Return picBaddy4.Image
            Case "picCoin"
                Return picCoin.Image
            Case "picGate"
                Return picGate.Image
            Case "picKey"
                Return picKey.Image
            Case "picStart"
                Return picStart.Image
            Case "picFinish"
                Return picFinish.Image
            Case "picBlockStopper1"
                Return picBlockStopper1.Image
            Case "picBall"
                Return picBall.Image
            Case "picBlockSwitch"
                Return picBlockSwitch.Image
            Case "picBomb"
                Return picBomb.Image
            Case "picWarp"
                Return picWarp.Image
            Case "picWarp2"
                Return picWarp2.Image
            Case Else
                Return Nothing
        End Select
    End Function

    Private Function IsVerticalItem(imgKey As String) As Boolean
        Return imgKey = "picFlipper1" OrElse imgKey = "picFlipper2" OrElse imgKey = "picLazer1"
    End Function

    Private Function IsHorizontalItem(imgKey As String) As Boolean
        Return imgKey = "picFlipper3" OrElse imgKey = "picFlipper4" OrElse imgKey = "picLazer2"
    End Function

    Private Function IsFlipperItem(imgKey As String) As Boolean
        Return imgKey = "picFlipper1" OrElse imgKey = "picFlipper2" OrElse imgKey = "picFlipper3" OrElse imgKey = "picFlipper4"
    End Function

    Private Sub AddWallAtMousePosition(mouseX As Integer, mouseY As Integer)
        UpdateHighlight(mouseX, mouseY)

        If highlightedWallX Then
            If highlightedX >= 0 AndAlso highlightedX < verticalWalls.Length AndAlso
           highlightedY >= 0 AndAlso highlightedY < verticalWalls(0).Length Then
                verticalWalls(highlightedX)(highlightedY) = True
                picGame.Invalidate()
            End If
        ElseIf highlightedWallY Then
            If highlightedX >= 0 AndAlso highlightedX < horizontalWalls.Length AndAlso
           highlightedY >= 0 AndAlso highlightedY < horizontalWalls(0).Length Then
                horizontalWalls(highlightedX)(highlightedY) = True
                picGame.Invalidate()
            End If
        End If
    End Sub

    Private Sub RemoveObjectAtMousePosition(mouseX As Integer, mouseY As Integer, removeWalls As Boolean, removeItems As Boolean)
        UpdateHighlight(mouseX, mouseY)

        If Not isMouseInsideGrid Then
            Return
        End If

        If highlightedWallX Then
            If highlightedX >= 0 AndAlso highlightedX < verticalWallItems.Length AndAlso
       verticalWallItems(highlightedX) IsNot Nothing AndAlso
       highlightedY >= 0 AndAlso highlightedY < verticalWallItems(0).Length Then

                If removeItems AndAlso verticalWallItems(highlightedX)(highlightedY) IsNot Nothing Then
                    verticalWallItems(highlightedX)(highlightedY) = Nothing
                    verticalWalls(highlightedX)(highlightedY) = True
                    picGame.Invalidate()

                    If IsVerticalWallConnectedToEdge(New Point(highlightedX, highlightedY)) Then
                        verticalWalls(highlightedX)(highlightedY) = True
                    End If
                ElseIf removeWalls AndAlso verticalWalls(highlightedX)(highlightedY) Then
                    If Not IsVerticalWallOuterBorder(highlightedX) AndAlso Not IsVerticalWallConnectedToEdge(New Point(highlightedX, highlightedY)) Then
                        verticalWalls(highlightedX)(highlightedY) = False
                        picGame.Invalidate()
                    End If
                End If
            End If
        ElseIf highlightedWallY Then
            If highlightedX >= 0 AndAlso highlightedX < horizontalWallItems.Length AndAlso
       horizontalWallItems(highlightedX) IsNot Nothing AndAlso
       highlightedY >= 0 AndAlso highlightedY < horizontalWallItems(0).Length Then

                If removeItems AndAlso horizontalWallItems(highlightedX)(highlightedY) IsNot Nothing Then
                    horizontalWallItems(highlightedX)(highlightedY) = Nothing
                    horizontalWalls(highlightedX)(highlightedY) = True
                    picGame.Invalidate()

                    If IsHorizontalWallConnectedToEdge(New Point(highlightedX, highlightedY)) Then
                        horizontalWalls(highlightedX)(highlightedY) = True
                    End If
                ElseIf removeWalls AndAlso horizontalWalls(highlightedX)(highlightedY) Then
                    If Not IsHorizontalWallOuterBorder(highlightedY) AndAlso Not IsHorizontalWallConnectedToEdge(New Point(highlightedX, highlightedY)) Then
                        horizontalWalls(highlightedX)(highlightedY) = False
                        picGame.Invalidate()
                    End If
                End If
            End If
        Else
            If highlightedX >= 0 AndAlso highlightedX < placedItems.Length AndAlso
       placedItems(highlightedX) IsNot Nothing AndAlso
       highlightedY >= 0 AndAlso highlightedY < placedItems(0).Length Then

                If removeItems AndAlso placedItems(highlightedX)(highlightedY) IsNot Nothing Then
                    placedItems(highlightedX)(highlightedY) = Nothing
                    picGame.Invalidate()
                End If
            End If
        End If
    End Sub

    Private Sub LoadSettingsFromFile(filePath As String)
        Try
            If Not File.Exists(filePath) Then Return
            Dim lines As String() = File.ReadAllLines(filePath)
            Dim section As String = ""
            For Each line As String In lines
                line = line.Trim()
                If String.IsNullOrEmpty(line) OrElse line.StartsWith(";") Then Continue For
                If line.StartsWith("[") AndAlso line.EndsWith("]") Then
                    section = line.Substring(1, line.Length - 2)
                Else
                    Dim parts() As String = line.Split(New Char() {":"c}, 2)
                    If parts.Length = 2 Then
                        LoadProperty(parts(0).Trim(), parts(1).Trim(), section)
                    End If
                End If
            Next

            UpdateSelections()
        Catch ex As Exception
            MessageBox.Show("Error loading settings: " & ex.Message)
        End Try
    End Sub

    Private Sub LoadProperty(key As String, value As String, section As String)
        Dim isWall As Boolean = (section = "Walls")
        Select Case key
            Case "HatchStyle"
                Dim hatchStyle As HatchStyle
                If [Enum].TryParse(value, hatchStyle) Then
                    If isWall Then wallsHatchStyle = hatchStyle Else floorsHatchStyle = hatchStyle
                End If
            Case "Color1"
                Dim color As Color = ParseColor(value)
                If isWall Then wallsColor1 = color Else floorsColor1 = color
            Case "Color2"
                Dim color As Color = ParseColor(value)
                If isWall Then wallsColor2 = color Else floorsColor2 = color
        End Select
    End Sub

    Private Function ParseColor(colorString As String) As Color
        Dim parts() As String = colorString.Split(","c)
        If parts.Length = 4 Then
            Dim a, r, g, b As Integer
            If Integer.TryParse(parts(0), a) AndAlso Integer.TryParse(parts(1), r) AndAlso
               Integer.TryParse(parts(2), g) AndAlso Integer.TryParse(parts(3), b) Then
                Return Color.FromArgb(a, r, g, b)
            End If
        End If
        Return Color.Black
    End Function

    Private Sub SaveSettingsToFile(filePath As String)
        Try
            Using sw As New StreamWriter(filePath)
                sw.WriteLine("[Walls]")
                sw.WriteLine("HatchStyle: " & wallsHatchStyle.ToString())
                sw.WriteLine("Color1: " & ColorToString(wallsColor1))
                sw.WriteLine("Color2: " & ColorToString(wallsColor2))
                sw.WriteLine()
                sw.WriteLine("[Floors]")
                sw.WriteLine("HatchStyle: " & floorsHatchStyle.ToString())
                sw.WriteLine("Color1: " & ColorToString(floorsColor1))
                sw.WriteLine("Color2: " & ColorToString(floorsColor2))
            End Using
        Catch ex As Exception
            MessageBox.Show("Error saving settings: " & ex.Message)
        End Try
    End Sub

    Private Function ColorToString(color As Color) As String
        Return $"{color.A},{color.R},{color.G},{color.B}"
    End Function

    Private Sub btnTest_Click(sender As Object, e As EventArgs) Handles btnTest.Click
        Dim tempFilePath As String = Path.Combine(Path.GetTempPath(), "temp.room")
        SaveRoomToFile(tempFilePath)

        PauseBackgroundTasks()

        Dim gameForm As New frmGame()
        gameForm.RoomFilePath = tempFilePath
        AddHandler gameForm.FormClosed, AddressOf OnGameFormClosed
        gameForm.Show()
    End Sub

    Private Sub PauseBackgroundTasks()
        animationTimer.Stop()
        highlightTimer.Stop()
    End Sub

    Private Sub ResumeBackgroundTasks()
        animationTimer.Start()
        highlightTimer.Start()
    End Sub

    Private Sub OnGameFormClosed(sender As Object, e As FormClosedEventArgs)
        ResumeBackgroundTasks()
    End Sub

    Private Function CloneJaggedArray(Of T)(sourceArray As T()()) As T()()
        Dim lengthOuter As Integer = sourceArray.Length
        Dim newArray As T()() = New T(lengthOuter - 1)() {}
        For i As Integer = 0 To lengthOuter - 1
            If sourceArray(i) IsNot Nothing Then
                Dim lengthInner As Integer = sourceArray(i).Length
                newArray(i) = New T(lengthInner - 1) {}
                Array.Copy(sourceArray(i), newArray(i), lengthInner)
            End If
        Next
        Return newArray
    End Function

    Private Function ConvertPlacedItemsToStrings(items As PlacedItem()()) As String()()
        Dim lengthOuter As Integer = items.Length
        Dim stringItems As String()() = New String(lengthOuter - 1)() {}
        For x As Integer = 0 To lengthOuter - 1
            If items(x) IsNot Nothing Then
                Dim lengthInner As Integer = items(x).Length
                stringItems(x) = New String(lengthInner - 1) {}
                For y As Integer = 0 To lengthInner - 1
                    If items(x)(y) IsNot Nothing Then
                        stringItems(x)(y) = items(x)(y).ImageKey
                    Else
                        stringItems(x)(y) = Nothing
                    End If
                Next
            End If
        Next
        Return stringItems
    End Function

    Public Sub SaveRoomToFile(filePath As String)
        Try
            Dim currentState As New RoomData(Me)

            Dim options As New JsonSerializerOptions With {
                .IncludeFields = True,
                .WriteIndented = True
            }
            Dim jsonString As String = JsonSerializer.Serialize(currentState, options)

            File.WriteAllText(filePath, jsonString)
        Catch ex As Exception
            MessageBox.Show("Error saving room: " & ex.Message)
        End Try
    End Sub

    Private Sub LoadRoomFromFile(filePath As String)
        Try
            If Not File.Exists(filePath) Then Return

            Dim options As New JsonSerializerOptions With {
            .IncludeFields = True
        }
            Dim jsonString As String = File.ReadAllText(filePath)
            Dim roomData As RoomData = JsonSerializer.Deserialize(Of RoomData)(jsonString, options)

            If roomData Is Nothing Then
                MessageBox.Show("Error: Failed to deserialize room data.")
                Return
            End If

            isRestoringState = True
            roomData.RestoreState(Me)
            isRestoringState = False

            UpdateSelections()

            If roomData.useGradient Then
                cboStyleChoice.SelectedIndex = cboStyleChoice.Items.IndexOf("Gradient")
            Else
                cboStyleChoice.SelectedIndex = cboStyleChoice.Items.IndexOf("HatchStyle")
            End If

            Me.Text = filePath

        Catch ex As Exception
            MessageBox.Show("Error loading room: " & ex.Message)
        End Try
    End Sub

    Private Sub btnTriggerEditor_Click(sender As Object, e As EventArgs) Handles btnTriggerEditor.Click
        PauseBackgroundTasks()
        Dim frm As New frmTriggerEditor()
        frm.ShowDialog()
    End Sub

    Private Sub btnAudio_Click(sender As Object, e As EventArgs) Handles btnAudio.Click, lblAudio.Click
        Dim selectedMusicParts As String() = SelectedMusic.Split(New String() {", V:", ", G:"}, StringSplitOptions.None)
        If selectedMusicParts.Length = 3 Then
            Dim audioFile As String = selectedMusicParts(0).Trim()
            Dim volume As Integer = Integer.Parse(selectedMusicParts(1).Trim())
            Dim gain As Integer = Integer.Parse(selectedMusicParts(2).Trim())
            PauseBackgroundTasks()
            Using frm As New frmMusic With {
            .InitialVolume = volume,
            .InitialGain = gain,
            .InitialSelectedTrack = audioFile
        }
                If frm.ShowDialog() = DialogResult.OK Then
                    Dim returnedVolume As Integer = frm.VolumeLevel
                    Dim returnedGain As Integer = frm.GainLevel
                    Dim returnedAudioFile As String = frm.AudioFile

                    SelectedMusic = String.Format("{0}, V:{1}, G:{2}", returnedAudioFile, returnedVolume, returnedGain)

                    Dim fileNameWithoutExtension As String = Path.GetFileNameWithoutExtension(returnedAudioFile)
                    lblAudio.Text = String.Format("{0}, V:{1}, G:{2}", fileNameWithoutExtension, returnedVolume, returnedGain)
                End If
            End Using
        Else
            MessageBox.Show("SelectedMusic string is not in the expected format.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
        End If
    End Sub

#End Region

End Class


Can you add recents to mnu. Any files opened would just be automatically added to mnu, moving down to the list every time a new file is opened or created etc. Perhaps a total of 5 possible recents.