/*
 * SPDX-FileCopyrightText: 2021 Devin Lin <espidev@gmail.com>
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

import QtQuick 2.15
import QtQuick.Layouts 1.1
import QtQuick.Controls 2.15 as Controls

import org.kde.plasma.components 3.0 as PC3
import org.kde.kirigami as Kirigami

import org.kde.plasma.private.mobileshell as MobileShell
import org.kde.plasma.private.mobileshell.state as MobileShellState
import plasma.applet.org.kde.plasma.mobile.homescreen.halcyon as Halcyon
import org.kde.plasma.plasmoid

MobileShell.GridView {
    id: gridView
    cacheBuffer: cellHeight * 20 // 10 rows above and below
    reuseItems: true

    Controls.ScrollBar.vertical: Controls.ScrollBar {}

    Connections {
        target: parent

        function onFocusRequested() {
            forceActiveFocus();
        }
    }

    // ensure items aren't visible out of bounds
    layer.enabled: true

    readonly property int reservedSpaceForLabel: metrics.height
    readonly property real effectiveContentWidth: width - leftMargin - rightMargin

    cellWidth: gridView.effectiveContentWidth / Math.min(Math.floor(effectiveContentWidth / (Kirigami.Units.iconSizes.huge + Kirigami.Units.largeSpacing * 2)), 8)
    cellHeight: cellWidth + reservedSpaceForLabel

    property int columns: Math.floor(effectiveContentWidth / cellWidth)
    property int rows: Math.ceil(Halcyon.ApplicationListModel.count / columns)

    function goToBeginning() {
        goToBeginningAnim.restart();
    }

    NumberAnimation on contentY {
        id: goToBeginningAnim
        to: gridView.originY
        duration: Kirigami.Units.longDuration
        easing.type: Easing.InOutQuad
    }

    model: Halcyon.ApplicationListModel

    header: MobileShell.BaseItem {
        implicitWidth: gridView.effectiveContentWidth
        topPadding: Kirigami.Units.gridUnit + Math.round(gridView.height * 0.1)
        bottomPadding: Kirigami.Units.gridUnit
        leftPadding: Kirigami.Units.smallSpacing

        contentItem: PC3.Label {
            color: "white"
            font.pointSize: 16
            font.weight: Font.Bold
            text: i18n("Applications")
        }
    }

    PC3.Label {
        id: metrics
        text: "M\nM"
        visible: false
        font.pointSize: Kirigami.Theme.defaultFont.pointSize * 0.85
        font.weight: Font.Bold
    }

    Keys.onReturnPressed: currentItem.launchApp()
    delegate: GridAppDelegate {
        id: delegate

        property Halcyon.Application application: model.application

        width: gridView.cellWidth
        height: gridView.cellHeight
        reservedSpaceForLabel: gridView.reservedSpaceForLabel

        onLaunch: (x, y, icon, title, storageId) => {
            if (icon !== "") {
                MobileShellState.ShellDBusClient.openAppLaunchAnimationWithPosition(
                    Plasmoid.screen,
                    icon,
                    title,
                    storageId,
                    delegate.iconItem.Kirigami.ScenePosition.x + delegate.iconItem.width/2,
                    delegate.iconItem.Kirigami.ScenePosition.y + delegate.iconItem.height/2,
                    Math.min(delegate.iconItem.width, delegate.iconItem.height));
            }

            application.setMinimizedDelegate(delegate);
            MobileShell.AppLaunch.launchOrActivateApp(application.storageId);
        }
    }

    Component.onCompleted: {
        goToBeginning();
    }
}