/*
    SPDX-FileCopyrightText: 2021 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
    SPDX-FileCopyrightText: 2022 ivan tkachenko <me@ratijas.tk>
    SPDX-FileCopyrightText: 2024 Marco Martin <mart@kde.org>

    SPDX-License-Identifier: GPL-2.0-or-later
*/

import QtQuick
import QtQuick.Window
import Qt5Compat.GraphicalEffects
import org.kde.kirigami as Kirigami
import org.kde.kwin as KWinComponents
import org.kde.kwin.private.effects
import org.kde.plasma.components 3.0 as PC3
import org.kde.plasma.extras as PlasmaExtras
import org.kde.ksvg 1.0 as KSvg

ExpoCell {
    id: thumb

    required property QtObject window
    required property int index
    required property Item windowHeap

    readonly property bool selected: windowHeap.selectedIndex === index
    property bool gestureInProgress: effect.gestureInProgress
    // Where the internal contentItem will be parented to
    property Item contentItemParent: this

    // no desktops is a special value which means "All Desktops"
    readonly property bool presentOnCurrentDesktop: !window.desktops.length || window.desktops.indexOf(KWinComponents.Workspace.currentDesktop) !== -1
    readonly property bool initialHidden: window.minimized || !presentOnCurrentDesktop
    readonly property bool activeHidden: {
        if (window.skipSwitcher) {
            return true;
        } else if (windowHeap.showOnly === "activeClass") {
            if (!KWinComponents.Workspace.activeWindow) {
                return true;
            } else {
                return KWinComponents.Workspace.activeWindow.resourceName !== window.resourceName;
            }
        } else {
            return windowHeap.showOnly.length !== 0
                && windowHeap.showOnly.indexOf(window.internalId) === -1;
        }
    }

    // Show a close button on this thumbnail
    property bool closeButtonVisible: true
    // Show a text label under this thumbnail
    property bool windowTitleVisible: true

    // Same as for window heap
    property bool animationEnabled: false

    //scale up and down the whole thumbnail without affecting layouting
    property real targetScale: 1.0

    property DragManager activeDragHandler: dragHandler

    // Swipe down gesture by touch, in some effects will close the window
    readonly property alias downGestureProgress: touchDragHandler.downGestureProgress
    signal downGestureTriggered()

    property bool isReady: width !== 0 && height !== 0

    function restoreDND(oldGlobalRect: rect) {
        thumbSource.restoreDND(oldGlobalRect);
    }

    layout: windowHeap.layout
    shouldLayout: !thumb.activeHidden
    partialActivationFactor: effect.partialActivationFactor
    naturalX: thumb.window.x - thumb.window.output.geometry.x
    naturalY: thumb.window.y - thumb.window.output.geometry.y
    naturalWidth: thumb.window.width
    naturalHeight: thumb.window.height
    persistentKey: thumb.window.internalId
    bottomMargin: icon.height / 4 + (thumb.windowTitleVisible ? caption.height + Kirigami.Units.smallSpacing : 0) + Kirigami.Units.largeSpacing

    Behavior on x {
        enabled: thumb.isReady
        NumberAnimation {
            duration: thumb.windowHeap.animationDuration
            easing.type: Easing.InOutCubic
        }
    }
    Behavior on y {
        enabled: thumb.isReady
        NumberAnimation {
            duration: thumb.windowHeap.animationDuration
            easing.type: Easing.InOutCubic
        }
    }
    Behavior on width {
        enabled: thumb.isReady
        NumberAnimation {
            duration: thumb.windowHeap.animationDuration
            easing.type: Easing.InOutCubic
        }
    }
    Behavior on height {
        enabled: thumb.isReady
        NumberAnimation {
            duration: thumb.windowHeap.animationDuration
            easing.type: Easing.InOutCubic
        }
    }

    contentItem: Item {
        id: mainContent
        parent: contentItemParent
        visible: opacity > 0 && (!activeHidden || !initialHidden)
        opacity: (1 - downGestureProgress) * (initialHidden ? partialActivationFactor : 1)
        z: (activeDragHandler.active || returnAnimation.running) ? 1000
            : thumb.window.stackingOrder * (presentOnCurrentDesktop ? 1 : 0.001)

        KWinComponents.WindowThumbnail {
            id: thumbSource
            wId: thumb.window.internalId
            scale: targetScale
            width: mainContent.width
            height: mainContent.height

            Binding on width {
                value: mainContent.width
                when: !returnAnimation.active
            }
            Binding on height {
                value: mainContent.height
                when: !returnAnimation.active
            }

            Drag.proposedAction: Qt.MoveAction
            Drag.supportedActions: Qt.MoveAction
            Drag.source: thumb.window
            Drag.hotSpot: Qt.point(
                thumb.activeDragHandler.centroid.pressPosition.x,
                thumb.activeDragHandler.centroid.pressPosition.y)
            Drag.keys: ["kwin-window"]

            onXChanged: effect.checkItemDraggedOutOfScreen(thumbSource)
            onYChanged: effect.checkItemDraggedOutOfScreen(thumbSource)

            function saveDND() {
                const oldGlobalRect = mapToItem(null, 0, 0, width, height);
                thumb.windowHeap.saveDND(thumb.window.internalId, oldGlobalRect);
            }
            function restoreDND(oldGlobalRect: rect) {
                const newGlobalRect = mapFromItem(null, oldGlobalRect);
                // Disable bindings
                returnAnimation.active = true;
                x = newGlobalRect.x;
                y = newGlobalRect.y;
                width = newGlobalRect.width;
                height = newGlobalRect.height;
                returnAnimation.restart();
            }
            function deleteDND() {
                thumb.windowHeap.deleteDND(thumb.window.internalId);
            }

            // Not using FrameSvg hover element intentionally for stylistic reasons
            Rectangle {
                border.width: Kirigami.Units.largeSpacing
                border.color: Kirigami.Theme.highlightColor
                anchors.fill: parent
                anchors.margins: -border.width
                radius: Kirigami.Units.cornerRadius
                color: "transparent"
                visible: !thumb.windowHeap.dragActive && (hoverHandler.hovered || (thumb.selected && Window.window.activeFocusItem)) && windowHeap.effectiveOrganized
            }

            MouseArea {
                anchors.fill: parent
                acceptedButtons: Qt.NoButton
                cursorShape: thumb.activeDragHandler.active ? Qt.ClosedHandCursor : Qt.ArrowCursor
            }
            ParallelAnimation {
                id: returnAnimation
                property bool active: false
                onRunningChanged: active = running
                NumberAnimation {
                    target: thumbSource
                    properties: "x,y"
                    to: 0
                    duration: thumb.windowHeap.animationDuration
                    easing.type: Easing.InOutCubic
                }
                NumberAnimation {
                    target: thumbSource
                    property: "width"
                    to: mainContent.width
                    duration: thumb.windowHeap.animationDuration
                    easing.type: Easing.InOutCubic
                }
                NumberAnimation {
                    target: thumbSource
                    property: "height"
                    to: mainContent.height
                    duration: thumb.windowHeap.animationDuration
                    easing.type: Easing.InOutCubic
                }
                NumberAnimation {
                    target: thumbSource
                    property: "scale"
                    to: 1
                    duration: thumb.windowHeap.animationDuration
                    easing.type: Easing.InOutCubic
                }
            }
        }

        PC3.Label {
            anchors.fill: thumbSource
            horizontalAlignment: Text.AlignHCenter
            verticalAlignment: Text.AlignVCenter
            text: i18nd("kwin", "Drag Down To Close")
            visible: !thumb.activeHidden && touchDragHandler.active
            background: Rectangle {
                anchors.centerIn: parent
                height: parent.contentHeight + Kirigami.Units.smallSpacing
                width: parent.contentWidth + Kirigami.Units.smallSpacing
                color: Kirigami.Theme.backgroundColor
                radius: Kirigami.Units.cornerRadius
            }
        }

        Kirigami.Icon {
            id: icon
            width: Kirigami.Units.iconSizes.large
            height: Kirigami.Units.iconSizes.large
            opacity: partialActivationFactor
            scale: Math.min(1.0, mainContent.width / Math.max(0.01, thumb.width))
            source: thumb.window.icon
            anchors.horizontalCenter: thumbSource.horizontalCenter
            anchors.verticalCenter: thumbSource.bottom
            anchors.verticalCenterOffset: -Math.round(height / 4) * scale
            visible: !thumb.activeHidden && !activeDragHandler.active && !returnAnimation.running
            PC3.Label {
                id: caption
                visible: thumb.windowTitleVisible
                width: thumb.width
                maximumLineCount: 1
                anchors.top: parent.bottom
                anchors.topMargin: Kirigami.Units.smallSpacing
                anchors.horizontalCenter: parent.horizontalCenter
                elide: Text.ElideRight
                text: thumb.window.caption
                color: Kirigami.Theme.textColor
                textFormat: Text.PlainText
                horizontalAlignment: Text.AlignHCenter
                verticalAlignment: Text.AlignVCenter
                background: Rectangle {
                    anchors.centerIn: parent
                    height: parent.contentHeight + Kirigami.Units.smallSpacing
                    width: parent.contentWidth + Kirigami.Units.smallSpacing
                    color: Kirigami.Theme.backgroundColor
                    radius: Kirigami.Units.cornerRadius
                }
            }
        }

        HoverHandler {
            id: hoverHandler
            onHoveredChanged: if (hovered !== selected) {
                thumb.windowHeap.resetSelected();
            }
        }

        TapHandler {
            acceptedButtons: Qt.LeftButton
            onTapped: {
                KWinComponents.Workspace.activeWindow = thumb.window;
                thumb.windowHeap.activated();
            }
            onPressedChanged: {
                if (pressed) {
                    thumbSource.Drag.active = true;
                } else if (!thumb.activeDragHandler.active) {
                    thumbSource.Drag.active = false;
                }
            }
        }

        component DragManager : DragHandler {
            target: thumbSource
            grabPermissions: PointerHandler.CanTakeOverFromAnything
            // This does not work when moving pointer fast and pressing along the way
            // See also QTBUG-105903, QTBUG-105904
            // enabled: thumb.state !== "active-normal"

            onActiveChanged: {
                thumb.windowHeap.dragActive = active;
                if (active) {
                    thumb.activeDragHandler = this;
                } else {
                    thumbSource.saveDND();
                    returnAnimation.restart();

                    var action = thumbSource.Drag.drop();
                    if (action === Qt.MoveAction) {
                        // This whole component is in the process of being destroyed due to drop onto
                        // another virtual desktop (not another screen).
                        if (typeof thumbSource !== "undefined") {
                            // Except the case when it was dropped on the same desktop which it's already on, so let's return to normal state anyway.
                            thumbSource.deleteDND();
                        }
                        return;
                    }

                    var globalPos = targetScreen.mapToGlobal(centroid.scenePosition);
                    effect.checkItemDroppedOutOfScreen(globalPos, thumbSource);

                    if (typeof thumbSource !== "undefined") {
                        // else, return to normal without reparenting
                        thumbSource.deleteDND();
                    }
                }
            }
        }

        DragManager {
            id: dragHandler
            acceptedDevices: PointerDevice.Mouse | PointerDevice.TouchPad | PointerDevice.Stylus
        }

        DragManager {
            id: touchDragHandler
            acceptedDevices: PointerDevice.TouchScreen
            readonly property double downGestureProgress: {
                if (!active) {
                    return 0.0;
                }

                const startDistance = thumb.windowHeap.Kirigami.ScenePosition.y + thumb.windowHeap.height - centroid.scenePressPosition.y;
                const localPosition = thumb.windowHeap.Kirigami.ScenePosition.y + thumb.windowHeap.height - centroid.scenePosition.y;
                return 1 - Math.min(localPosition/startDistance, 1);
            }

            onActiveChanged: {
                if (!active) {
                    if (downGestureProgress > 0.6) {
                        thumb.downGestureTriggered();
                    }
                }
            }
        }

        Loader {
            id: closeButton
            LayoutMirroring.enabled: Qt.application.layoutDirection === Qt.RightToLeft

            anchors {
                right: thumbSource.right
                top: thumbSource.top
                margins: Kirigami.Units.smallSpacing
            }
            active: thumb.closeButtonVisible && (hoverHandler.hovered || Kirigami.Settings.tabletMode || Kirigami.Settings.hasTransientTouchInput) && thumb.window.closeable && !thumb.activeDragHandler.active && !returnAnimation.running

            sourceComponent: PC3.Button {
                text: i18ndc("kwin", "@info:tooltip as in: 'close this window'", "Close window")
                icon.name: "window-close"
                display: PC3.AbstractButton.IconOnly

                PC3.ToolTip.text: text
                PC3.ToolTip.visible: hovered && display === PC3.AbstractButton.IconOnly
                PC3.ToolTip.delay: Kirigami.Units.toolTipDelay
                Accessible.name: text

                onClicked: thumb.window.closeWindow();
            }
        }

        Component.onDestruction: {
            if (selected) {
                windowHeap.resetSelected();
            }
        }
    }
}