// SPDX-FileCopyrightText: 2015 Marco Martin <notmart@gmail.com>
// SPDX-FileCopyrightText: 2021-2023 Devin Lin <devin@kde.org>
// SPDX-License-Identifier: GPL-2.0-or-later

import QtQuick 2.15
import QtQuick.Layouts 1.1
import QtQuick.Window 2.2
import QtQuick.Controls 2.2 as QQC2
import Qt5Compat.GraphicalEffects

import org.kde.plasma.core 2.0 as PlasmaCore
import org.kde.plasma.components 3.0 as PlasmaComponents
import org.kde.kwin 3.0 as KWinComponents

Item {
    id: delegate

    required property var taskSwitcher

    required property QtObject window
    required property int index

    required property var model

    required property real previewHeight
    required property real previewWidth

    readonly property real dragOffset: -control.y

    property bool showHeader: true
    property real darken: 0

    opacity: 1 - dragOffset / taskSwitcher.height

//BEGIN functions
    function closeApp() {
        delegate.window.closeWindow();
    }

    function activateApp() {
        taskSwitcherState.wasInActiveTask = false;
        taskSwitcher.activateWindow(model.index, delegate.window);
        window.setMaximize(true, true);
    }

    function minimizeApp() {
        delegate.window.minimized = true;
    }
//END functions

    MouseArea {
        id: control
        width: parent.width
        height: parent.height
        enabled: !taskSwitcher.taskSwitcherState.currentlyBeingOpened

        // set cursor shape here, since taphandler seems to not be able to do it
        cursorShape: Qt.PointingHandCursor

        property bool movingUp: false
        property real oldY: y
        onYChanged: {
            movingUp = y < oldY;
            oldY = y;
        }

        // drag up gesture
        DragHandler {
            id: dragHandler
            target: parent

            enabled: !taskSwitcher.taskSwitcherState.currentlyBeingOpened

            yAxis.enabled: true
            xAxis.enabled: false
            yAxis.maximum: 0

            // y > 0 - dragging down (opening the app)
            // y < 0 - dragging up (dismissing the app)
            onActiveChanged: {
                yAnimator.stop();

                if (control.movingUp && parent.y < -PlasmaCore.Units.gridUnit * 2) {
                    yAnimator.to = -root.height;
                } else {
                    yAnimator.to = 0;
                }
                yAnimator.start();
            }
        }

        // if the app doesn't close within a certain time, drag it back
        Timer {
            id: uncloseTimer
            interval: 3000
            onTriggered: {
                yAnimator.to = 0;
                yAnimator.restart();
            }
        }

        NumberAnimation on y {
            id: yAnimator
            running: !dragHandler.active
            duration: PlasmaCore.Units.longDuration
            easing.type: Easing.InOutQuad
            to: 0
            onFinished: {
                if (to != 0) { // close app
                    delegate.closeApp();
                    uncloseTimer.start();
                }
            }
        }

        // application
        ColumnLayout {
            id: column
            anchors.fill: parent
            spacing: 0

            // header
            RowLayout {
                id: appHeader
                Layout.fillWidth: true
                Layout.fillHeight: true
                Layout.minimumHeight: column.height - appView.height
                spacing: PlasmaCore.Units.smallSpacing * 2
                opacity: delegate.showHeader ? 1 : 0

                Behavior on opacity {
                    NumberAnimation { duration: PlasmaCore.Units.shortDuration }
                }

                PlasmaCore.IconItem {
                    Layout.preferredHeight: PlasmaCore.Units.iconSizes.smallMedium
                    Layout.preferredWidth: PlasmaCore.Units.iconSizes.smallMedium
                    Layout.alignment: Qt.AlignVCenter
                    usesPlasmaTheme: false
                    source: delegate.window.icon
                }

                PlasmaComponents.Label {
                    Layout.fillWidth: true
                    Layout.alignment: Qt.AlignVCenter
                    elide: Text.ElideRight
                    text: delegate.window.caption
                    color: "white"
                }

                PlasmaComponents.ToolButton {
                    Layout.alignment: Qt.AlignVCenter
                    z: 99
                    icon.name: "window-close"
                    icon.width: PlasmaCore.Units.iconSizes.smallMedium
                    icon.height: PlasmaCore.Units.iconSizes.smallMedium
                    onClicked: delegate.closeApp()
                }
            }

            // app preview
            Rectangle {
                id: appView
                Layout.preferredWidth: delegate.previewWidth
                Layout.preferredHeight: delegate.previewHeight
                Layout.maximumWidth: delegate.previewWidth
                Layout.maximumHeight: delegate.previewHeight

                color: "transparent"
                clip: true

                // scale animation on press
                property real zoomScale: tapHandler.pressed ? 0.9 : 1
                Behavior on zoomScale {
                    NumberAnimation {
                        duration: 200
                        easing.type: Easing.OutExpo
                    }
                }

                transform: Scale {
                    origin.x: appView.width / 2;
                    origin.y: appView.height / 2;
                    xScale: appView.zoomScale
                    yScale: appView.zoomScale
                }

                Item {
                    id: item
                    anchors.fill: parent

                    KWinComponents.WindowThumbnail {
                        id: thumbSource
                        wId: delegate.window.internalId
                        anchors.fill: parent

                        layer {
                            enabled: true
                            effect: ColorOverlay {
                                color: Qt.rgba(0, 0, 0, delegate.darken)
                            }
                        }
                    }

                    TapHandler {
                        id: tapHandler
                        enabled: !taskSwitcher.taskSwitcherState.currentlyBeingOpened
                        onTapped: delegate.activateApp()
                    }
                }
            }
        }
    }
}