Option Explicit On
Option Strict On

Imports System.Windows.Forms
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.IO
Imports System.Text.Json
Imports System.Linq

Public Class frmDesigner
    Inherits Form

#Region "Variables"
    Private Const INDENT As Integer = 20
    Private Const SQCOUNTX As Integer = 15
    Private Const 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", "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
#End Region

#Region "Constructor and Initialization"

    Public Sub New()
        InitializeComponent()
        InitializeWalls()
        InitializeTimers()
        InitializeEventHandlers()
        LoadPremades()
        LoadMusic()
        InitializeAnimationForImages()
        If Not isRestoringState Then SaveStateForUndo()
    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

    Private 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

        ' Initialize the outer walls (borders)
        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

        ' Initialize placed items
        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

        ' Initialize floorsUseEdgeStyle
        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}
        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

        ' 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 handlers for menu items
        AddHandler mnuNew.Click, AddressOf mnuNew_Click
        AddHandler mnuLoad.Click, AddressOf mnuLoad_Click
        AddHandler mnuSave.Click, AddressOf mnuSave_Click
        AddHandler mnuSaveAs.Click, AddressOf mnuSaveAs_Click

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

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

    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)

        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
        LoadMusic()
        LoadPremades()

        ' Populate lstHatchstyles with hatch style names
        lstHatchstyles.Items.Clear()
        For Each hs As HatchStyle In [Enum].GetValues(GetType(HatchStyle))
            lstHatchstyles.Items.Add(hs.ToString())
        Next

        ' Set default selections
        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)
        cboMusic.Items.Clear()
        For Each file As String In Directory.GetFiles(musicFolder, "*.wav")
            cboMusic.Items.Add(Path.GetFileNameWithoutExtension(file))
        Next
    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)
        ' Required but can be left empty
    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"))

            ' Update lstHatchstyles selection after loading settings
            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 pt.X > 0 AndAlso pt.X < SQCOUNTX 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 pt.Y > 0 AndAlso pt.Y < SQCOUNTY 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

    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
        ' Cancel the selection
        selectionRectangle = Rectangle.Empty
        isInSelectionMode = False
        Cursor = Cursors.Default
        picGame.Invalidate()
    End Sub

    Private Sub mnuNew_Click(sender As Object, e As EventArgs) Handles mnuNew.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 = ""

        ' Clear level name and music selection
        txtName.Text = ""
        SelectedMusic = ""
        cboMusic.SelectedIndex = -1

        ' Update selections
        UpdateSelections()

        picGame.Invalidate()
    End Sub

    Private Sub mnuSave_Click(sender As Object, e As EventArgs)
        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)
        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

            ' Update lstHatchstyles selection
            UpdateSelections()
            picGame.Invalidate()
        End If
    End Sub

    Private Sub mnuSaveAs_Click(sender As Object, e As EventArgs)
        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 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

            ' Update selections
            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

            ' Update selections
            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 cboMusic_SelectedIndexChanged(sender As Object, e As EventArgs)
        SelectedMusic = If(cboMusic.SelectedItem?.ToString(), "")
        If Not isRestoringState Then SaveStateForUndo()
    End Sub

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

        ' Update the HatchStyle list selection
        UpdateSelections()
        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 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)
        CalculateSquareSizes(picGame.ClientSize.Width, picGame.ClientSize.Height)
        e.Graphics.SmoothingMode = SmoothingMode.None
        DrawGrid(e.Graphics)
        DrawHighlight(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
                        ' Draw vertical wall item under cursor
                        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

                        ' Keep original image width, stretch height
                        Dim newWidth As Integer = img.Width
                        Dim newHeight As Integer = wallHeight

                        ' Center horizontally
                        Dim centeredX As Integer = xPos + (wallWidth - newWidth) \ 2
                        drawRect = New Rectangle(centeredX, yPos, newWidth, newHeight)
                    Else
                        ' Draw horizontal wall item under cursor
                        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

                        ' Stretch width, keep original image height
                        Dim newWidth As Integer = wallWidth
                        Dim newHeight As Integer = img.Height

                        ' Center vertically
                        Dim centeredY As Integer = yPos + (wallHeight - newHeight) \ 2
                        drawRect = New Rectangle(xPos, centeredY, newWidth, newHeight)
                    End If
                Else
                    ' Draw floor item under cursor
                    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 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
    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()
        End If
    End Sub

    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
                UpdateHighlight(picGameClientPoint.X, picGameClientPoint.Y)

                ' Place the item if the drop location is valid
                If isMouseInsideGrid Then
                    If highlightedWallX AndAlso draggedItemIsWall AndAlso draggedItemIsVerticalWall Then
                        ' Place vertical wall item
                        verticalWallItems(highlightedX)(highlightedY) = draggedItem
                        verticalWalls(highlightedX)(highlightedY) = False
                    ElseIf highlightedWallY AndAlso draggedItemIsWall AndAlso Not draggedItemIsVerticalWall Then
                        ' Place horizontal wall item
                        horizontalWallItems(highlightedX)(highlightedY) = draggedItem
                        horizontalWalls(highlightedX)(highlightedY) = False
                    ElseIf Not highlightedWallX AndAlso Not highlightedWallY AndAlso Not draggedItemIsWall Then
                        ' Place floor item
                        placedItems(highlightedX)(highlightedY) = draggedItem
                    Else
                        ' Invalid drop location, return item to original location
                        ReturnItemToOriginalLocation()
                    End If
                Else
                    ' Not inside grid, return item to original location
                    ReturnItemToOriginalLocation()
                End If
            Else
                ' Not over picGame, return item to original location
                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 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
                    If Not isRestoringState Then SaveStateForUndo()
                End If
            ElseIf e.Button = MouseButtons.Left Then
                UpdateHighlight(e.X, e.Y)
                Dim itemPickedUp As Boolean = False
                If isMouseInsideGrid Then
                    If Not isActionInProgress Then
                        isActionInProgress = True
                        If Not isRestoringState Then SaveStateForUndo()
                    End If

                    ' Try to pick up an item first
                    If highlightedWallX Then
                        If verticalWallItems(highlightedX)(highlightedY) IsNot Nothing Then
                            ' Pick up vertical wall item
                            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
                    ElseIf highlightedWallY Then
                        If horizontalWallItems(highlightedX)(highlightedY) IsNot Nothing Then
                            ' Pick up horizontal wall item
                            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
                    Else
                        If placedItems(highlightedX)(highlightedY) IsNot Nothing Then
                            ' Pick up floor item
                            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

                    If itemPickedUp Then
                        redoStack.Clear()
                        picGame.Invalidate()
                    Else
                        ' If no item was picked up, proceed to set edge style
                        If rdoEdge.Checked Then
                            isLeftMouseDown = True
                            SetEdgeStyleAtMousePosition(e.X, e.Y)
                        Else
                            ' Existing logic for adding walls or other elements
                            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 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
                ElseIf 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
    End Sub
    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 Sub PicGame_MouseUp(sender As Object, e As MouseEventArgs) Handles picGame.MouseUp
        If 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 Then
                    ' Calculate the center point of the selection rectangle
                    Dim centerX As Integer = selectionRectangle.Left + selectionRectangle.Width \ 2
                    Dim centerY As Integer = selectionRectangle.Top + selectionRectangle.Height \ 2
                    Dim menuPosition As New Point(centerX, centerY)

                    ' Show context menu at the center of the selection rectangle
                    ctmMenu.Show(picGame, menuPosition)
                End If
            End If
        Else
            If e.Button = MouseButtons.Left Then
                If isDraggingItem Then
                    isDraggingItem = False
                    picGame.Capture = False

                    If isMouseInsideGrid Then
                        If highlightedWallX AndAlso draggedItemIsWall AndAlso draggedItemIsVerticalWall Then
                            verticalWallItems(highlightedX)(highlightedY) = draggedItem
                            verticalWalls(highlightedX)(highlightedY) = False
                        ElseIf highlightedWallY AndAlso draggedItemIsWall AndAlso Not draggedItemIsVerticalWall Then
                            horizontalWallItems(highlightedX)(highlightedY) = draggedItem
                            horizontalWalls(highlightedX)(highlightedY) = False
                        ElseIf Not highlightedWallX AndAlso Not highlightedWallY AndAlso Not draggedItemIsWall Then
                            placedItems(highlightedX)(highlightedY) = draggedItem
                        Else
                            ReturnItemToOriginalLocation()
                        End If
                    Else
                        ReturnItemToOriginalLocation()
                    End If

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

                    picGame.Invalidate()
                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
                    ' Remove edge style at the mouse position
                    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
                    ' Existing logic for right-click when not in edge mode
                    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
    End Sub
#End Region

#Region "Utility and Helper Methods"

    Private Sub CalculateSquareSizes(clientWidth As Integer, clientHeight As Integer)
        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

        ' Draw floor squares
        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
                Else
                    Using floorBrush As New HatchBrush(floorsHatchStyle, floorsColor1, floorsColor2)
                        g.FillRectangle(floorBrush, floorRect)
                    End Using
                End If
            Next
        Next

        ' Draw wall intersections
        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

        ' Draw vertical walls or floor
        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 verticalWalls(x)(y) Then
                    ' Draw wall
                    Using wallBrush As New HatchBrush(wallsHatchStyle, wallsColor1, wallsColor2)
                        g.FillRectangle(wallBrush, wallRect)
                    End Using
                Else
                    ' Draw floor
                    Using floorBrush As New HatchBrush(floorsHatchStyle, floorsColor1, floorsColor2)
                        g.FillRectangle(floorBrush, wallRect)
                    End Using
                End If
            Next
        Next

        ' Draw horizontal walls or floor
        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 horizontalWalls(x)(y) Then
                    ' Draw wall
                    Using wallBrush As New HatchBrush(wallsHatchStyle, wallsColor1, wallsColor2)
                        g.FillRectangle(wallBrush, wallRect)
                    End Using
                Else
                    ' Draw floor
                    Using floorBrush As New HatchBrush(floorsHatchStyle, floorsColor1, floorsColor2)
                        g.FillRectangle(floorBrush, wallRect)
                    End Using
                End If
            Next
        Next

        ' Draw items
        DrawItems(g)
        DrawWallItems(g)
    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)

                            ' Draw the item with preserved transparency
                            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)
        ' Draw vertical wall items
        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

                            ' Keep original image width, stretch height
                            Dim newWidth As Integer = img.Width
                            Dim newHeight As Integer = wallHeight

                            ' Center horizontally
                            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

        ' Draw horizontal wall items
        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

                            ' Stretch width, keep original image height
                            Dim newWidth As Integer = wallWidth
                            Dim newHeight As Integer = img.Height

                            ' Center vertically
                            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 Then Return
        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

        If mouseX >= 0 AndAlso mouseY >= 0 Then
            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 < SQCOUNTX 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
        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

                ' Place walls around the cell

                ' Left vertical wall at (highlightedX, highlightedY)
                If highlightedX >= 0 AndAlso highlightedX < verticalWalls.Length Then
                    ' Only place the wall if there isn't a wall item there
                    If verticalWallItems(highlightedX)(highlightedY) Is Nothing Then
                        verticalWalls(highlightedX)(highlightedY) = True
                    End If
                End If

                ' Right vertical wall at (highlightedX + 1, highlightedY)
                If highlightedX + 1 >= 0 AndAlso highlightedX + 1 < verticalWalls.Length Then
                    If verticalWallItems(highlightedX + 1)(highlightedY) Is Nothing Then
                        verticalWalls(highlightedX + 1)(highlightedY) = True
                    End If
                End If

                ' Top horizontal wall at (highlightedX, highlightedY)
                If highlightedX >= 0 AndAlso highlightedX < horizontalWalls.Length AndAlso highlightedY >= 0 AndAlso highlightedY < horizontalWalls(0).Length Then
                    If horizontalWallItems(highlightedX)(highlightedY) Is Nothing Then
                        horizontalWalls(highlightedX)(highlightedY) = True
                    End If
                End If

                ' Bottom horizontal wall at (highlightedX, highlightedY + 1)
                If highlightedX >= 0 AndAlso highlightedX < horizontalWalls.Length AndAlso highlightedY + 1 >= 0 AndAlso highlightedY + 1 < horizontalWalls(0).Length Then
                    If horizontalWallItems(highlightedX)(highlightedY + 1) Is Nothing Then
                        horizontalWalls(highlightedX)(highlightedY + 1) = True
                    End If
                End If

                picGame.Invalidate()
            End If
        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))
    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 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)

        ' Update the HatchStyle list selection if Walls radio button is checked
        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)

        ' Update the HatchStyle list selection if Floors radio button is checked
        UpdateSelections()
    End Sub

    Private Sub UpdateSelections()
        ' Update Hatch Style Selection
        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

        ' Update Music Selection
        If Not String.IsNullOrEmpty(SelectedMusic) Then
            If cboMusic.Items.Contains(SelectedMusic) Then
                cboMusic.SelectedItem = SelectedMusic
            Else
                MessageBox.Show("The music file '" & SelectedMusic & "' is not available.", "Music Not Found", MessageBoxButtons.OK, MessageBoxIcon.Warning)
                cboMusic.SelectedIndex = -1
            End If
        Else
            cboMusic.SelectedIndex = -1 ' No selection
        End If
    End Sub

    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
                    ' Update Color1
                    If rdoFloors.Checked Then
                        floorsColor1 = selectedColor
                    ElseIf rdoWalls.Checked Then
                        wallsColor1 = selectedColor
                    ElseIf rdoEdge.Checked Then
                        wallsColor1 = selectedColor ' For edge, use wall's color
                    End If
                ElseIf num >= 51 AndAlso num <= 98 Then
                    ' Update Color2
                    If rdoFloors.Checked Then
                        floorsColor2 = selectedColor
                    ElseIf rdoWalls.Checked Then
                        wallsColor2 = selectedColor
                    ElseIf rdoEdge.Checked Then
                        wallsColor2 = selectedColor ' For edge, use wall's color
                    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 Else
                Return Nothing
        End Select
    End Function

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

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

    Private Sub AddWallAtMousePosition(mouseX As Integer, mouseY As Integer)
        UpdateHighlight(mouseX, mouseY)
        If highlightedWallX Then
            If verticalWallItems(highlightedX)(highlightedY) Is Nothing AndAlso
               highlightedX > 0 AndAlso highlightedX < SQCOUNTX Then
                verticalWalls(highlightedX)(highlightedY) = True
                picGame.Invalidate()
            End If
        ElseIf highlightedWallY Then
            If horizontalWallItems(highlightedX)(highlightedY) Is Nothing AndAlso
               highlightedY > 0 AndAlso highlightedY < SQCOUNTY 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 highlightedWallX Then
            If removeItems AndAlso verticalWallItems(highlightedX)(highlightedY) IsNot Nothing Then
                verticalWallItems(highlightedX)(highlightedY) = Nothing
                picGame.Invalidate()
            ElseIf removeWalls AndAlso verticalWalls(highlightedX)(highlightedY) AndAlso highlightedX > 0 AndAlso highlightedX < SQCOUNTX Then
                verticalWalls(highlightedX)(highlightedY) = False
                picGame.Invalidate()
            End If
        ElseIf highlightedWallY Then
            If removeItems AndAlso horizontalWallItems(highlightedX)(highlightedY) IsNot Nothing Then
                horizontalWallItems(highlightedX)(highlightedY) = Nothing
                picGame.Invalidate()
            ElseIf removeWalls AndAlso horizontalWalls(highlightedX)(highlightedY) AndAlso highlightedY > 0 AndAlso highlightedY < SQCOUNTY Then
                horizontalWalls(highlightedX)(highlightedY) = False
                picGame.Invalidate()
            End If
        Else
            If removeItems AndAlso placedItems(highlightedX)(highlightedY) IsNot Nothing Then
                placedItems(highlightedX)(highlightedY) = Nothing
                picGame.Invalidate()
            End If
        End If
    End Sub

    Private Sub SaveRoomToFile(filePath As String)
        Try
            Dim roomState As New RoomState(Me)
            Dim options As New JsonSerializerOptions With {
                .WriteIndented = True,
                .IncludeFields = True
            }
            Dim jsonString As String = JsonSerializer.Serialize(roomState, 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 roomState As RoomState = JsonSerializer.Deserialize(Of RoomState)(jsonString, options)

            ' Ensure music is loaded before restoring state
            LoadMusic()

            roomState.RestoreState(Me)

            ' Update selections
            UpdateSelections()

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

            ' Update lstHatchstyles selection after loading settings
            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


#End Region

End Class

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Text.Json

Public Class RoomState
    ' Properties to save colors and styles
    Public wallsHatchStyleValue As Integer
    Public wallsColor1Argb As Integer
    Public wallsColor2Argb As Integer
    Public floorsHatchStyleValue As Integer
    Public floorsColor1Argb As Integer
    Public floorsColor2Argb As Integer

    ' Arrays to save wall states
    Public verticalWalls()() As Boolean
    Public horizontalWalls()() As Boolean

    ' Arrays to save placed items
    Public placedItems()() As PlacedItemData
    Public verticalWallItems()() As PlacedItemData
    Public horizontalWallItems()() As PlacedItemData

    ' Arrays to save floor edge styles
    Public floorsUseEdgeStyle()() As Boolean

    ' Property to save the selected music
    Public SelectedMusic As String

    ' Property to save the level name
    Public LevelName As String

    ' Parameterless constructor for deserialization
    Public Sub New()
        ' This constructor is used by the deserializer
    End Sub

    ' Constructor: captures the current state of the frmDesigner
    Public Sub New(roomView As frmDesigner)
        ' Save colors and styles as integers
        wallsHatchStyleValue = CInt(roomView.wallsHatchStyle)
        wallsColor1Argb = roomView.wallsColor1.ToArgb()
        wallsColor2Argb = roomView.wallsColor2.ToArgb()
        floorsHatchStyleValue = CInt(roomView.floorsHatchStyle)
        floorsColor1Argb = roomView.floorsColor1.ToArgb()
        floorsColor2Argb = roomView.floorsColor2.ToArgb()

        ' Save wall states
        verticalWalls = CloneJaggedArray(roomView.verticalWalls)
        horizontalWalls = CloneJaggedArray(roomView.horizontalWalls)

        ' Save placed items
        placedItems = CopyPlacedItems(roomView.placedItems)
        verticalWallItems = CopyPlacedItems(roomView.verticalWallItems)
        horizontalWallItems = CopyPlacedItems(roomView.horizontalWallItems)

        ' Save floorsUseEdgeStyle
        floorsUseEdgeStyle = CloneJaggedArray(roomView.floorsUseEdgeStyle)

        ' Save the selected music
        SelectedMusic = roomView.SelectedMusic

        ' Save the level name
        LevelName = roomView.txtName.Text
    End Sub

    ' Helper method to clone jagged arrays
    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

    ' Helper method to copy placed items
    Private Function CopyPlacedItems(items As PlacedItem()()) As PlacedItemData()()
        Dim lengthOuter As Integer = items.Length
        Dim copiedItems As PlacedItemData()() = New PlacedItemData(lengthOuter - 1)() {}
        For x As Integer = 0 To lengthOuter - 1
            If items(x) IsNot Nothing Then
                Dim lengthInner As Integer = items(x).Length
                copiedItems(x) = New PlacedItemData(lengthInner - 1) {}
                For y As Integer = 0 To lengthInner - 1
                    If items(x)(y) IsNot Nothing Then
                        copiedItems(x)(y) = New PlacedItemData With {.ImageKey = items(x)(y).ImageKey}
                    End If
                Next
            End If
        Next
        Return copiedItems
    End Function

    ' Restore the saved state back into the frmDesigner
    Public Sub RestoreState(roomView As frmDesigner)
        ' Restore colors and styles from integers
        roomView.wallsHatchStyle = CType(wallsHatchStyleValue, HatchStyle)
        roomView.wallsColor1 = Color.FromArgb(wallsColor1Argb)
        roomView.wallsColor2 = Color.FromArgb(wallsColor2Argb)
        roomView.floorsHatchStyle = CType(floorsHatchStyleValue, HatchStyle)
        roomView.floorsColor1 = Color.FromArgb(floorsColor1Argb)
        roomView.floorsColor2 = Color.FromArgb(floorsColor2Argb)

        ' Restore wall states
        roomView.verticalWalls = CloneJaggedArray(verticalWalls)
        roomView.horizontalWalls = CloneJaggedArray(horizontalWalls)

        ' Restore placed items
        roomView.placedItems = RestorePlacedItems(placedItems)
        roomView.verticalWallItems = RestorePlacedItems(verticalWallItems)
        roomView.horizontalWallItems = RestorePlacedItems(horizontalWallItems)

        ' Restore floorsUseEdgeStyle
        roomView.floorsUseEdgeStyle = CloneJaggedArray(floorsUseEdgeStyle)

        ' Restore the selected music
        roomView.SelectedMusic = SelectedMusic

        ' Restore the level name
        roomView.txtName.Text = LevelName
    End Sub

    ' Helper method to restore placed items
    Private Function RestorePlacedItems(data As PlacedItemData()()) As PlacedItem()()
        Dim lengthOuter As Integer = data.Length
        Dim restoredItems As PlacedItem()() = New PlacedItem(lengthOuter - 1)() {}
        For x As Integer = 0 To lengthOuter - 1
            If data(x) IsNot Nothing Then
                Dim lengthInner As Integer = data(x).Length
                restoredItems(x) = New PlacedItem(lengthInner - 1) {}
                For y As Integer = 0 To lengthInner - 1
                    If data(x)(y) IsNot Nothing Then
                        restoredItems(x)(y) = New PlacedItem With {.ImageKey = data(x)(y).ImageKey}
                    End If
                Next
            End If
        Next
        Return restoredItems
    End Function
End Class

' Data class to represent a placed item
Public Class PlacedItem
    Public Property ImageKey As String
End Class

' Serializable data class for placed item
Public Class PlacedItemData
    Public Property ImageKey As String
End Class

I've added mnuAddEdge in ctmMenu (In Designer) which will add an edge to the selected area. Can you code it?