/*
    SPDX-FileCopyrightText: 2011 Marco Martin <mart@kde.org>

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

import QtQuick 2.7
import QtQuick.Controls 2.5 as QQC2

import org.kde.plasma.components 3.0 as PC3
import org.kde.plasma.core as PlasmaCore
import org.kde.plasma.extras 2.0 as PlasmaExtras
import org.kde.kquickcontrolsaddons 2.0
import org.kde.kwindowsystem 1.0
import org.kde.kirigami 2.20 as Kirigami

import QtQuick.Window 2.1
import QtQuick.Layouts 1.1

import org.kde.plasma.private.shell 2.0

PC3.Page {
    id: main

    width: Math.max(heading.paintedWidth, Kirigami.Units.iconSizes.enormous * 3 + Kirigami.Units.smallSpacing * 4 + Kirigami.Units.gridUnit * 2)
    height: 800//Screen.height

    opacity: draggingWidget ? 0.3 : 1

    property QtObject containment

    property PlasmaCore.Dialog sidePanel

    //external drop events can cause a raise event causing us to lose focus and
    //therefore get deleted whilst we are still in a drag exec()
    //this is a clue to the owning dialog that hideOnWindowDeactivate should be deleted
    //See https://bugs.kde.org/show_bug.cgi?id=332733
    property bool preventWindowHide: draggingWidget || categoriesDialog.status !== PlasmaExtras.Menu.Closed
                                  || getWidgetsDialog.status !== PlasmaExtras.Menu.Closed

    // We might've lost focus during the widget drag and drop or whilst using
    // the "get widgets" dialog; however we prevented the sidebar to hide.
    // This might get the sidebar stuck, since we only hide when losing focus.
    // To avoid this we reclaim focus as soon as the drag and drop is done,
    // or the get widgets window is closed.
    onPreventWindowHideChanged: {
        if (!preventWindowHide && !sidePanel.active) {
            sidePanel.requestActivate()
        }
    }

    property bool outputOnly: draggingWidget

    property Item categoryButton

    property bool draggingWidget: false

    signal closed()

    onVisibleChanged: {
        if (!visible) {
            KWindowSystem.showingDesktop = false
        }
    }

    Component.onCompleted: {
        if (!root.widgetExplorer) {
            root.widgetExplorer = widgetExplorerComponent.createObject(root)
        }
        root.widgetExplorer.containment = main.containment
    }

    Component.onDestruction: {
        if (pendingUninstallTimer.running) {
            // we're not being destroyed so at least reset the filters
            widgetExplorer.widgetsModel.filterQuery = ""
            widgetExplorer.widgetsModel.filterType = ""
            widgetExplorer.widgetsModel.searchTerm = ""
        } else {
            root.widgetExplorer.destroy()
            root.widgetExplorer = null
        }
    }

    function addCurrentApplet() {
        var pluginName = list.currentItem ? list.currentItem.pluginName : ""
        if (pluginName) {
            widgetExplorer.addApplet(pluginName)
        }
    }

    QQC2.Action {
        shortcut: "Escape"
        onTriggered: {
            if (searchInput.length > 0) {
                searchInput.text = ""
            } else {
                main.closed()
            }
        }
    }

    QQC2.Action {
        shortcut: "Enter"
        onTriggered: addCurrentApplet()
    }
    QQC2.Action {
        shortcut: "Return"
        onTriggered: addCurrentApplet()
    }

    Component {
        id: widgetExplorerComponent

        WidgetExplorer {
            //view: desktop
            onShouldClose: main.closed();
        }
    }

    PlasmaExtras.ModelContextMenu {
        id: categoriesDialog
        visualParent: categoryButton
        // model set on first invocation

        onClicked: {
            list.contentX = 0
            list.contentY = 0
            categoryButton.text = (model.filterData ? model.display : i18nd("plasma_shell_org.kde.plasma.desktop", "All Widgets"))
            widgetExplorer.widgetsModel.filterQuery = model.filterData
            widgetExplorer.widgetsModel.filterType = model.filterType
        }
    }

    PlasmaExtras.ModelContextMenu {
        id: getWidgetsDialog
        visualParent: getWidgetsButton
        placement: PlasmaExtras.Menu.TopPosedLeftAlignedPopup
        // model set on first invocation
        onClicked: model.trigger()
    }

    header: PlasmaExtras.PlasmoidHeading {
        ColumnLayout {
            id: header
            anchors.fill: parent

            spacing: Kirigami.Units.smallSpacing

            RowLayout {
                spacing: Kirigami.Units.smallSpacing
                Kirigami.Heading {
                    id: heading
                    level: 1
                    text: i18nd("plasma_shell_org.kde.plasma.desktop", "Widgets")
                    textFormat: Text.PlainText
                    elide: Text.ElideRight

                    Layout.fillWidth: true
                }
                PC3.ToolButton {
                    id: getWidgetsButton
                    icon.name: "get-hot-new-stuff"
                    text: i18nd("plasma_shell_org.kde.plasma.desktop", "Get New Widgets…")

                    KeyNavigation.right: closeButton
                    KeyNavigation.down: searchInput

                    onClicked: {
                        getWidgetsDialog.model = widgetExplorer.widgetsMenuActions
                        getWidgetsDialog.openRelative()
                    }
                }
                PC3.ToolButton {
                    id: closeButton
                    icon.name: "window-close"

                    KeyNavigation.down: categoryButton

                    onClicked: main.closed()
                }
            }

            RowLayout {
                spacing: Kirigami.Units.smallSpacing

                PlasmaExtras.SearchField {
                    id: searchInput
                    Layout.fillWidth: true

                    KeyNavigation.down: list
                    KeyNavigation.right: categoryButton

                    onTextChanged: {
                        list.positionViewAtBeginning()
                        list.currentIndex = -1
                        widgetExplorer.widgetsModel.searchTerm = text
                    }

                    Component.onCompleted: if (!Kirigami.InputMethod.willShowOnActive) { forceActiveFocus() }
                }
                PC3.ToolButton {
                    id: categoryButton
                    text: i18nd("plasma_shell_org.kde.plasma.desktop", "All Widgets")
                    icon.name: "view-filter"

                    KeyNavigation.down: list

                    onClicked: {
                        categoriesDialog.model = widgetExplorer.filterModel
                        categoriesDialog.open(0, categoryButton.height)
                    }

                    PC3.ToolTip {
                        text: i18nd("plasma_shell_org.kde.plasma.desktop", "Categories")
                    }
                }
            }
        }
    }

    footer: PlasmaExtras.PlasmoidHeading {
        position: PC3.ToolBar.Footer
        visible: pendingUninstallTimer.applets.length > 0
        contentItem: PC3.Button {
            text: i18ndp("plasma_shell_org.kde.plasma.desktop", "Confirm Removal Of One Widget", "Confirm Removal Of %1 Widgets", pendingUninstallTimer.applets.length)
            onClicked: pendingUninstallTimer.uninstall()
        }
    }

    Timer {
        id: setModelTimer
        interval: 20
        running: true
        onTriggered: list.model = widgetExplorer.widgetsModel
    }

    PC3.ScrollView {
        anchors.fill: parent
        anchors.rightMargin: - main.sidePanel.margins.right

        // hide the flickering by fading in nicely
        opacity: setModelTimer.running ? 0 : 1
        Behavior on opacity {
            OpacityAnimator {
                duration: Kirigami.Units.longDuration
                easing.type: Easing.InOutQuad
            }
        }

        GridView {
            id: list

            // model set delayed by Timer above

            activeFocusOnTab: true
            cellWidth: Math.floor(width / 3)
            cellHeight: cellWidth + Kirigami.Units.gridUnit * 4 + Kirigami.Units.smallSpacing * 2

            delegate: AppletDelegate {}
            highlight: PlasmaExtras.Highlight {
                pressed: list.currentItem && list.currentItem.pressed
            }
            highlightMoveDuration: 0
            //highlightResizeDuration: 0

            //slide in to view from the left
            add: Transition {
                NumberAnimation {
                    properties: "x"
                    from: -list.width
                    duration: Kirigami.Units.shortDuration
                }
            }

            //slide out of view to the right
            remove: Transition {
                NumberAnimation {
                    properties: "x"
                    to: list.width
                    duration: Kirigami.Units.shortDuration
                }
            }

            //if we are adding other items into the view use the same animation as normal adding
            //this makes everything slide in together
            //if we make it move everything ends up weird
            addDisplaced: list.add

            //moved due to filtering
            displaced: Transition {
                NumberAnimation {
                    properties: "x,y"
                    duration: Kirigami.Units.shortDuration
                }
            }

            KeyNavigation.up: searchInput
        }
    }

    PlasmaExtras.PlaceholderMessage {
        anchors.centerIn: parent
        width: parent.width - (Kirigami.Units.gridUnit * 4)
        iconName: "edit-none"
        text: searchInput.text.length > 0 ? i18nd("plasma_shell_org.kde.plasma.desktop", "No widgets matched the search terms") : i18nd("plasma_shell_org.kde.plasma.desktop", "No widgets available")
        visible: list.count == 0 && !setModelTimer.running
    }
}