pragma ComponentBehavior: Bound
import Qt5Compat.GraphicalEffects
import QtQuick
import QtQuick.Controls
import QtQuick.Layouts
import Quickshell
import Quickshell.Widgets
import Quickshell.Wayland
import qs.services
import qs.modules.common
import qs.modules.common.widgets
import qs.modules.common.functions

Item {
    id: root
    property real maxWindowPreviewHeight: 200
    property real maxWindowPreviewWidth: 300
    property real windowControlsHeight: 30
    property real buttonPadding: 5

    property Item lastHoveredButton: null
    property bool buttonHovered: false
    property bool requestDockShow: previewPopup.show

    // Drag-to-combine target, shared across all dock buttons/stacks. A
    // DropArea's 500ms dwell sets these; the dragged button reads them on
    // release to decide the combine. dragTargetStackId non-empty means the
    // drop target is an existing stack (add into it); empty means a plain
    // app (make a new stack).
    property string dragTargetAppId: ""
    property string dragTargetStackId: ""

    // Cap from Dock.qml: the widest the app list may grow before the dock
    // would outgrow the screen. Past it the ListView scrolls horizontally.
    property real maxWidth: -1

    Layout.fillHeight: true
    // No top-only margin: it shoved the whole icon list DOWN inside the bar
    // with nothing balancing it — the actual cause of icons drooping below
    // the dock. fillHeight + the dockRow centering handle vertical placement.
    implicitWidth: maxWidth >= 0 ? Math.min(listView.contentWidth, maxWidth) : listView.contentWidth

    Behavior on implicitWidth {
        animation: Appearance.animation.elementMoveFast.numberAnimation.createObject(this)
    }

    function popupCenterXForButton(button) {
        if (!button || !root.QsWindow)
            return 0;
        return root.QsWindow.mapFromItem(button, button.width / 2, 0).x;
    }

    StyledListView {
        id: listView
        spacing: 2
        orientation: ListView.Horizontal
        anchors.fill: parent
        clip: true
        // Only flickable when the list actually overflows, so touch drags on
        // the buttons (drag-to-combine) aren't stolen while everything fits.
        interactive: contentWidth > width
        boundsBehavior: Flickable.StopAtBounds

        model: ScriptModel {
            objectProp: "appId"
            values: TaskbarApps.apps
        }
        delegate: Loader {
            required property var modelData
            // Fan-out stack entries render as DockStack; everything else
            // (pinned apps, running windows, separators) as DockAppButton.
            sourceComponent: modelData.isStack ? stackComp : appComp

            Component {
                id: appComp
                DockAppButton {
                    appToplevel: modelData
                    appListRoot: root
                    topInset: Appearance.sizes.hyprlandGapsOut + root.buttonPadding
                    bottomInset: Appearance.sizes.hyprlandGapsOut + root.buttonPadding
                }
            }
            Component {
                id: stackComp
                DockStack {
                    appToplevel: modelData
                    appListRoot: root
                    topInset: Appearance.sizes.hyprlandGapsOut + root.buttonPadding
                    bottomInset: Appearance.sizes.hyprlandGapsOut + root.buttonPadding
                }
            }
        }
    }

    PopupWindow {
        id: previewPopup
        property var appTopLevel: root.lastHoveredButton?.appToplevel

        property bool shouldShow: (popupMouseArea.containsMouse || root.buttonHovered) && appTopLevel && appTopLevel.toplevels && appTopLevel.toplevels.length > 0

        property bool show: false
        property real cachedCenterX: 0

        Connections {
            target: root
            function onLastHoveredButtonChanged() {
                if (root.lastHoveredButton && root.QsWindow)
                    previewPopup.cachedCenterX = root.popupCenterXForButton(root.lastHoveredButton);
            }
            function onButtonHoveredChanged() {
                if (root.buttonHovered && root.lastHoveredButton && root.QsWindow)
                    previewPopup.cachedCenterX = root.popupCenterXForButton(root.lastHoveredButton);
                updateTimer.restart();
            }
        }

        onShouldShowChanged: {
            updateTimer.restart();
        }

        Timer {
            id: updateTimer
            interval: 100
            onTriggered: {
                previewPopup.show = previewPopup.shouldShow;
            }
        }

        anchor {
            window: root.QsWindow.window
            adjustment: PopupAdjustment.None
            gravity: Edges.Top | Edges.Right
            edges: Edges.Top | Edges.Left
        }

        visible: popupBackground.opacity > 0
        color: "transparent"
        implicitWidth: root.QsWindow.window?.width ?? 1
        implicitHeight: popupMouseArea.implicitHeight + root.windowControlsHeight + Appearance.sizes.elevationMargin * 2

        MouseArea {
            id: popupMouseArea
            anchors.bottom: parent.bottom
            implicitWidth: popupBackground.implicitWidth + Appearance.sizes.elevationMargin * 2
            implicitHeight: root.maxWindowPreviewHeight + root.windowControlsHeight + Appearance.sizes.elevationMargin * 2
            hoverEnabled: true
            x: previewPopup.cachedCenterX - width / 2

            StyledRectangularShadow {
                target: popupBackground
                opacity: previewPopup.show ? 1 : 0
                visible: opacity > 0
                Behavior on opacity {
                    animation: Appearance.animation.elementMoveFast.numberAnimation.createObject(this)
                }
            }

            Rectangle {
                id: popupBackground
                property real padding: 5
                opacity: previewPopup.show ? 1 : 0
                visible: opacity > 0
                Behavior on opacity {
                    animation: Appearance.animation.elementMoveFast.numberAnimation.createObject(this)
                }
                clip: true
                color: Appearance.m3colors.m3surfaceContainer
                radius: Appearance.rounding.normal
                anchors.bottom: parent.bottom
                anchors.bottomMargin: Appearance.sizes.elevationMargin
                anchors.horizontalCenter: parent.horizontalCenter
                implicitHeight: previewRowLayout.implicitHeight + padding * 2
                implicitWidth: previewRowLayout.implicitWidth + padding * 2
                Behavior on implicitWidth {
                    animation: Appearance.animation.elementMoveFast.numberAnimation.createObject(this)
                }
                Behavior on implicitHeight {
                    animation: Appearance.animation.elementMoveFast.numberAnimation.createObject(this)
                }

                RowLayout {
                    id: previewRowLayout
                    anchors.centerIn: parent
                    Repeater {
                        model: ScriptModel {
                            values: previewPopup.appTopLevel?.toplevels ?? []
                        }
                        RippleButton {
                            id: windowButton
                            Layout.fillHeight: true
                            required property var modelData
                            padding: 0
                            middleClickAction: () => {
                                windowButton.modelData?.close();
                            }
                            onClicked: {
                                windowButton.modelData?.activate();
                            }
                            contentItem: ColumnLayout {
                                implicitWidth: screencopyView.implicitWidth
                                implicitHeight: screencopyView.implicitHeight

                                ButtonGroup {
                                    contentWidth: parent.width - anchors.margins * 2
                                    StyledText {
                                        Layout.margins: 5
                                        Layout.fillWidth: true
                                        font.pixelSize: Appearance.font.pixelSize.small
                                        text: windowButton.modelData?.title
                                        elide: Text.ElideRight
                                        color: Appearance.m3colors.m3onSurface
                                    }
                                    GroupButton {
                                        id: closeButton
                                        colBackground: ColorUtils.transparentize(Appearance.colors.colSurfaceContainer)
                                        baseWidth: root.windowControlsHeight
                                        baseHeight: root.windowControlsHeight
                                        buttonRadius: Appearance.rounding.full
                                        contentItem: MaterialSymbol {
                                            anchors.centerIn: parent
                                            horizontalAlignment: Text.AlignHCenter
                                            text: "close"
                                            iconSize: Appearance.font.pixelSize.normal
                                            color: Appearance.m3colors.m3onSurface
                                        }
                                        onClicked: {
                                            windowButton.modelData?.close();
                                        }
                                    }
                                }
                                Item {
                                    Layout.fillWidth: true
                                    Layout.fillHeight: true
                                    implicitHeight: screencopyView.height
                                    implicitWidth: screencopyView.width
                                    ScreencopyView {
                                        id: screencopyView
                                        anchors.centerIn: parent
                                        captureSource: windowButton.modelData
                                        live: true
                                        paintCursor: true
                                        constraintSize: Qt.size(root.maxWindowPreviewWidth, root.maxWindowPreviewHeight)
                                        layer.enabled: true
                                        layer.effect: OpacityMask {
                                            maskSource: Rectangle {
                                                width: screencopyView.width
                                                height: screencopyView.height
                                                radius: Appearance.rounding.small
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}