/*
    SPDX-FileCopyrightText: 2019 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 2.6
import QtQuick.Layouts 1.1
import QtQuick.Controls 2.3 as QtControls
import org.kde.kirigami 2.5 as Kirigami
import org.kde.kcm 1.3 as KCM
import org.kde.private.kcms.style 1.0 as Private

KCM.GridViewKCM {
    id: root

    KCM.ConfigModule.quickHelp: i18n("This module allows you to modify the visual appearance of applications' user interface elements.")

    view.model: kcm.model
    view.currentIndex: kcm.model.selectedStyleIndex

    KCM.SettingStateBinding {
        configObject: kcm.styleSettings
        settingName: "widgetStyle"
    }

    function openGtkStyleSettings() {
        kcm.push("GtkStylePage.qml");
    }

    Component.onCompleted: {
        // The widget thumbnails are a bit more elaborate and need more room, especially when translated
        view.implicitCellWidth = Kirigami.Units.gridUnit * 21;
        view.implicitCellHeight = Kirigami.Units.gridUnit * 15;
    }

    // putting the InlineMessage as header item causes it to show up initially despite visible false
    header: ColumnLayout {
        Kirigami.InlineMessage {
            id: infoLabel
            Layout.fillWidth: true

            showCloseButton: true
            visible: false

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

    view.delegate: KCM.GridDelegate {
        id: delegate

        text: model.display
        toolTip: model.description

        thumbnailAvailable: thumbnailItem.valid
        thumbnail: Item {
            anchors.fill: parent
            clip: thumbnailItem.implicitWidth * thumbnailItem.scale > width

            Private.PreviewItem {
                id: thumbnailItem
                anchors.centerIn: parent
                // Fit the widget's width in the grid view
                // Round up to the nearest 0.05, so that 0.95 gets scaled up to 1.0
                // to avoid blurriness in case the widget is only slightly bigger
                scale: (Math.ceil(Math.min(1, parent.width / implicitWidth) * 20) / 20).toFixed(2)
                width: Math.max(parent.width, implicitWidth)
                // Scale the height back up as the background color comes from the style
                // and we don't want to leave an ugly gap above/below it
                height: parent.height / scale
                smooth: true
                styleName: model.styleName
            }

            Connections {
                target: kcm
                function onStyleReconfigured(message) {
                    if (styleName === model.styleName) {
                        thumbnailItem.reload();
                    }
                }
            }
        }

        actions: [
            Kirigami.Action {
                iconName: "document-edit"
                tooltip: i18n("Configure Style…")
                enabled: model.configurable
                onTriggered: kcm.configure(model.display, model.styleName, delegate)
            }
        ]
        onClicked: {
            kcm.model.selectedStyle = model.styleName;
            view.forceActiveFocus();
        }
        onDoubleClicked: {
            kcm.save();
        }
    }

    footer: ColumnLayout {
        RowLayout {
            Layout.alignment: Qt.AlignLeft

            QtControls.ToolButton {
                id: effectSettingsButton
                text: i18n("Configure Icons and Toolbars")
                icon.name: "configure-toolbars" // proper icon?
                flat: false
                checkable: true
                checked: effectSettingsPopupLoader.item && effectSettingsPopupLoader.item.opened
                onClicked: {
                    effectSettingsPopupLoader.active = true;
                    effectSettingsPopupLoader.item.open();
                }
            }
            Kirigami.ActionToolBar {
                flat: false
                alignment: Qt.AlignRight
                actions: [
                    Kirigami.Action {
                        visible: kcm.gtkConfigKdedModuleLoaded
                        text: i18n("Configure GNOME/GTK Application Style…")
                        icon.name: "configure"
                        onTriggered: root.openGtkStyleSettings()
                    }
                ]
            }
        }
    }

    Loader {
        id: effectSettingsPopupLoader
        active: false
        sourceComponent: EffectSettingsPopup {
            parent: effectSettingsButton
            y: -height
        }
    }
}