-- Create component
local SelectionPane = Roact.PureComponent:extend(script.Name)

function SelectionPane:init()
    self.Maid = Maid.new()
    self.PaneSize, self.SetPaneSize = Roact.createBinding(UDim2.new())

    self:UpdateHistoryState()
    self.Maid.TrackHistory = self.props.Core.History.Changed:Connect(function ()
        self:UpdateHistoryState()
    end)

    self:UpdateSelectionState()
    self.Maid.TrackSelection = self.props.Core.Selection.Changed:Connect(function ()
        self:UpdateSelectionState()
    end)

    self:UpdateExplorerState()
    self.Maid.TrackExplorer = self.props.Core.ExplorerVisibilityChanged:Connect(function ()
        self:UpdateExplorerState()
    end)
end

function SelectionPane:UpdateHistoryState()
    self:setState({
        CanUndo = (self.props.Core.History.Index > 0);
        CanRedo = (self.props.Core.History.Index ~= #self.props.Core.History.Stack);
    })
end

function SelectionPane:UpdateSelectionState()
    self:setState({
        IsSelectionEmpty = (#self.props.Core.Selection.Items == 0);
    })
end

function SelectionPane:UpdateExplorerState()
    self:setState({
        IsExplorerOpen = self.props.Core.ExplorerVisible;
    })
end

function SelectionPane:willUnmount()
    self.Maid:Destroy()
end

function SelectionPane:render()
    return new('Frame', {
        BackgroundTransparency = 0.7;
        BackgroundColor3 = Color3.fromRGB(0, 0, 0);
        BorderSizePixel = 0;
        Size = self.PaneSize;
        LayoutOrder = self.props.LayoutOrder;
    }, {
        Corners = new('UICorner', {
            CornerRadius = UDim.new(0, 3);
        });
        SizeConstraint = new('UISizeConstraint', {
            MinSize = Vector2.new(70, 0);
        });
        Layout = new('UIGridLayout', {
            CellPadding = UDim2.new(0, 0, 0, 0);
            CellSize = UDim2.new(0, 35, 0, 35);
            FillDirection = Enum.FillDirection.Horizontal;
            FillDirectionMaxCells = 0;
            HorizontalAlignment = Enum.HorizontalAlignment.Left;
            VerticalAlignment = Enum.VerticalAlignment.Top;
            SortOrder = Enum.SortOrder.LayoutOrder;
            StartCorner = Enum.StartCorner.TopLeft;
            [Roact.Ref] = function (rbx)
                if rbx then
                    self.SetPaneSize(UDim2.fromOffset(rbx.AbsoluteContentSize.X, rbx.AbsoluteContentSize.Y))
                end
            end;
            [Roact.Change.AbsoluteContentSize] = function (rbx)
                self.SetPaneSize(UDim2.fromOffset(rbx.AbsoluteContentSize.X, rbx.AbsoluteContentSize.Y))
            end;
        });

        UndoButton = new(SelectionButton, {
            LayoutOrder = 0;
            IconAssetId = 'rbxassetid://141741408';
            IsActive = self.state.CanUndo;
            OnActivated = self.props.Core.History.Undo;
            TooltipText = '<b>UNDO</b><br />Shift-Z';
        });
        RedoButton = new(SelectionButton, {
            LayoutOrder = 1;
            IconAssetId = 'rbxassetid://141741327';
            IsActive = self.state.CanRedo;
            OnActivated = self.props.Core.History.Redo;
            TooltipText = '<b>REDO</b><br />Shift-Y';
        });
        DeleteButton = new(SelectionButton, {
            LayoutOrder = 2;
            IconAssetId = 'rbxassetid://141896298';
            IsActive = not self.state.IsSelectionEmpty;
            OnActivated = self.props.Core.DeleteSelection;
            TooltipText = '<b>DELETE</b><br />Shift-X';
        });
        ExportButton = new(SelectionButton, {
            LayoutOrder = 3;
            IconAssetId = 'rbxassetid://141741337';
            IsActive = not self.state.IsSelectionEmpty;
            OnActivated = self.props.Core.ExportSelection;
            TooltipText = '<b>EXPORT</b><br />Shift-P';
        });
        CloneButton = new(SelectionButton, {
            LayoutOrder = 4;
            IconAssetId = 'rbxassetid://142073926';
            IsActive = not self.state.IsSelectionEmpty;
            OnActivated = self.props.Core.CloneSelection;
            TooltipText = '<b>CLONE</b><br />Shift-C';
        });
        ExplorerButton = new(SelectionButton, {
            LayoutOrder = 5;
            IconAssetId = 'rbxassetid://2326621485';
            IsActive = self.state.IsExplorerOpen;
            OnActivated = self.props.Core.ToggleExplorer;
            TooltipText = '<b>EXPLORER</b><br />Shift-H';
        });
    })
end

return SelectionPane