/*
    SPDX-FileCopyrightText: 2018 Kai Uwe Broulik <kde@privat.broulik.de>

    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
*/

import QtQuick 2.7
import QtQuick.Layouts 1.1
import QtQuick.Window 2.2
import QtQuick.Dialogs 1.0 as QtDialogs
import QtQuick.Controls 2.3 as QtControls
import org.kde.kirigami 2.14 as Kirigami
import org.kde.kquickcontrolsaddons 2.0 as KQCAddons
import org.kde.newstuff 1.81 as NewStuff
import org.kde.kcm 1.3 as KCM

import org.kde.private.kcms.icons 1.0 as Private

KCM.GridViewKCM {
    id: root
    KCM.ConfigModule.quickHelp: i18n("This module allows you to choose the icons for your desktop.")

    view.model: kcm.iconsModel
    view.currentIndex: kcm.pluginIndex(kcm.iconsSettings.theme)
    enabled: !kcm.downloadingFile

    KCM.SettingStateBinding {
        configObject: kcm.iconsSettings
        settingName: "Theme"
    }

    DropArea {
        enabled: view.enabled
        anchors.fill: parent
        onEntered: {
            if (!drag.hasUrls) {
                drag.accepted = false;
            }
        }
        onDropped: kcm.installThemeFromFile(drop.urls[0])
    }

    view.delegate: KCM.GridDelegate {
        id: delegate

        text: model.display
        toolTip: model.description

        thumbnailAvailable: typeof thumbFlow.previews === "undefined" || thumbFlow.previews.length > 0
        thumbnail: MouseArea {
            id: thumbArea

            anchors.fill: parent
            acceptedButtons: Qt.NoButton
            hoverEnabled: true
            clip: thumbFlow.y < 0

            opacity: model.pendingDeletion ? 0.3 : 1
            Behavior on opacity {
                NumberAnimation { duration: Kirigami.Units.longDuration }
            }

            Timer {
                interval: 1000
                repeat: true
                running: thumbArea.containsMouse
                onRunningChanged: {
                    if (!running) {
                        thumbFlow.currentPage = 0;
                    }
                }
                onTriggered: {
                    if (!thumbFlow.allPreviesLoaded) {
                        thumbFlow.loadPreviews(-1 /*no limit*/);
                        thumbFlow.allPreviesLoaded = true;
                    }

                    ++thumbFlow.currentPage;
                    if (thumbFlow.currentPage >= thumbFlow.pageCount) {
                        stop();
                    }
                }
            }

            Flow {
                id: thumbFlow

                // undefined is "didn't load preview yet"
                // empty array is "no preview available"
                property var previews
                // initially we only load 6 and when the animation starts we'll load the rest
                property bool allPreviesLoaded: false

                property int currentPage
                readonly property int pageCount: Math.ceil(thumbRepeater.count / (thumbFlow.columns * thumbFlow.rows))

                readonly property int iconWidth: Math.floor(thumbArea.width / thumbFlow.columns)
                readonly property int iconHeight: Math.floor(thumbArea.height / thumbFlow.rows)

                readonly property int columns: 3
                readonly property int rows: 2

                function loadPreviews(limit) {
                    previews = kcm.previewIcons(model.themeName, Math.min(thumbFlow.iconWidth, thumbFlow.iconHeight), Screen.devicePixelRatio, limit);
                }

                width: parent.width
                y: -currentPage * iconHeight * rows

                Behavior on y {
                    NumberAnimation { duration: Kirigami.Units.longDuration }
                }

                Repeater {
                    id: thumbRepeater
                    model: thumbFlow.previews

                    Item {
                        width: thumbFlow.iconWidth
                        height: thumbFlow.iconHeight

                        KQCAddons.QPixmapItem {
                            anchors.centerIn: parent
                            width: Math.min(parent.width, nativeWidth)
                            height: Math.min(parent.height, nativeHeight)
                            // load on demand and avoid leaking a tiny corner of the icon
                            pixmap: thumbFlow.y < 0 || index < (thumbFlow.columns * thumbFlow.rows) ? modelData : undefined
                            smooth: true
                            fillMode: KQCAddons.QPixmapItem.PreserveAspectFit
                        }
                    }
                }

                Component.onCompleted: {
                    // avoid reloading it when icon sizes or dpr changes on startup
                    Qt.callLater(function() {
                        // We show 6 icons initially (3x2 grid), only load those
                        thumbFlow.loadPreviews(6 /*limit*/);
                    });
                }
            }
        }

        actions: [
            Kirigami.Action {
                iconName: "edit-delete"
                tooltip: i18n("Remove Icon Theme")
                enabled: model.removable
                visible: !model.pendingDeletion
                onTriggered: model.pendingDeletion = true
            },
            Kirigami.Action {
                iconName: "edit-undo"
                tooltip: i18n("Restore Icon Theme")
                visible: model.pendingDeletion
                onTriggered: model.pendingDeletion = false
            }
        ]
        onClicked: {
            if (!model.pendingDeletion) {
                kcm.iconsSettings.theme = model.themeName;
            }
            view.forceActiveFocus();
        }
        onDoubleClicked: {
            kcm.save();
        }
    }

    footer: ColumnLayout {
        Kirigami.InlineMessage {
            id: infoLabel
            Layout.fillWidth: true

            showCloseButton: true

            Connections {
                target: kcm
                function onShowSuccessMessage(message) {
                    infoLabel.type = Kirigami.MessageType.Positive;
                    infoLabel.text = message;
                    infoLabel.visible = true;
                }
                function onShowErrorMessage(message) {
                    infoLabel.type = Kirigami.MessageType.Error;
                    infoLabel.text = message;
                    infoLabel.visible = true;
                }
            }
        }

        RowLayout {
            id: progressRow
            visible: false

            QtControls.BusyIndicator {
                id: progressBusy
            }

            QtControls.Label {
                id: progressLabel
                Layout.fillWidth: true
                textFormat: Text.PlainText
                wrapMode: Text.WordWrap
            }

            Connections {
                target: kcm
                onShowProgress: {
                    progressLabel.text = message;
                    progressBusy.running = true;
                    progressRow.visible = true;
                }
                onHideProgress: {
                    progressBusy.running = false;
                    progressRow.visible = false;
                }
            }
        }

        RowLayout {
            Layout.fillWidth: true
            // Using a non-flat toolbutton here, so it matches the items in the actiontoolbar
            // (a Button is just ever so slightly smaller than a ToolButton, and it would look
            // kind of silly if the buttons aren't the same size)
            QtControls.ToolButton {
                id: iconSizesButton
                text: i18n("Configure Icon Sizes")
                icon.name: "transform-scale" // proper icon?
                display: QtControls.ToolButton.TextBesideIcon
                flat: false
                checkable: true
                checked: iconSizePopupLoader.item && iconSizePopupLoader.item.opened
                onClicked: {
                    iconSizePopupLoader.active = true;
                    iconSizePopupLoader.item.open();
                }
            }

            Kirigami.ActionToolBar {
                flat: false
                alignment: Qt.AlignRight
                actions: [
                    Kirigami.Action {
                        enabled: root.view.enabled
                        text: i18n("Install from File…")
                        icon.name: "document-import"
                        onTriggered: fileDialogLoader.active = true
                    },
                    NewStuff.Action {
                        text: i18n("Get New Icons…")
                        configFile: "icons.knsrc"
                        onEntryEvent: function (entry, event) {
                            if (event == 1) { // StatusChangedEvent
                                kcm.ghnsEntriesChanged();
                            } else if (event == 2) { // AdoptedEvent
                                kcm.reloadConfig();
                            }
                        }
                    }
                ]
            }
        }
    }

    Loader {
        id: iconSizePopupLoader
        active: false
        sourceComponent: IconSizePopup {
            parent: iconSizesButton
            y: -height
        }
    }

    Loader {
        id: fileDialogLoader
        active: false
        sourceComponent: QtDialogs.FileDialog {
            title: i18n("Open Theme")
            folder: shortcuts.home
            nameFilters: [ i18n("Theme Files (*.tar.gz *.tar.bz2)") ]
            Component.onCompleted: open()
            onAccepted: {
                kcm.installThemeFromFile(fileUrls[0])
                fileDialogLoader.active = false
            }
            onRejected: {
                fileDialogLoader.active = false
            }
        }
    }
}