/*
 *   SPDX-FileCopyrightText: 2014 Marco Martin <notmart@gmail.com>
 *   SPDX-FileCopyrightText: 2021 Devin Lin <devin@kde.org>
 *
 *   SPDX-License-Identifier: LGPL-2.0-or-later
 */

import QtQuick 2.15
import QtQuick.Controls 2.15
import QtQuick.Layouts 1.1
import QtQuick.Window 2.2

import org.kde.plasma.core 2.0 as PlasmaCore
import org.kde.plasma.components 3.0 as PlasmaComponents
import org.kde.plasma.private.mobileshell 1.0 as MobileShell
import org.kde.plasma.private.mobileshell.state 1.0 as MobileShellState

import "../../components" as Components
import "../../components/util.js" as Util

/**
 * Quick settings elements layout, change the height to clip.
 */
Item {
    id: root
    clip: true
    
    required property var actionDrawer
    required property int mode

    enum Mode {
        Pages,
        ScrollView
    }

    readonly property real columns: Math.round(Util.applyMinMaxRange(3, 6, width / intendedColumnWidth))
    readonly property real columnWidth: Math.floor(width / columns)
    readonly property int minimizedColumns: Math.round(Util.applyMinMaxRange(5, 8, width / intendedMinimizedColumnWidth))
    readonly property real minimizedColumnWidth: Math.floor(width / minimizedColumns)
    
    readonly property real rowHeight: columnWidth * 0.7
    readonly property real fullHeight: fullView.implicitHeight
    
    readonly property real intendedColumnWidth: 120
    readonly property real intendedMinimizedColumnWidth: PlasmaCore.Units.gridUnit * 3 + PlasmaCore.Units.largeSpacing
    readonly property real minimizedRowHeight: PlasmaCore.Units.gridUnit * 3 + PlasmaCore.Units.largeSpacing
    
    property real minimizedViewProgress: 0
    property real fullViewProgress: 1

    readonly property MobileShell.QuickSettingsModel quickSettingsModel: MobileShell.QuickSettingsModel {}
    
    readonly property int columnCount: Math.floor(width/columnWidth)
    readonly property int rowCount: {
        let totalRows = Math.ceil(quickSettingsCount / columnCount);

        if (root.mode === QuickSettings.Pages) {
            // portrait orientation
            let maxRows = 5; // more than 5 is just disorienting
            let targetRows = Math.floor(Window.height * 0.65 / rowHeight);
            return Math.min(maxRows, Math.min(totalRows, targetRows));
            
        } else if (root.mode === QuickSettings.ScrollView) {
            // horizontal orientation
            let targetRows = Math.floor(Window.height * 0.8 / rowHeight);
            return Math.min(totalRows, targetRows);
        }
    }
    
    readonly property int pageSize: rowCount * columnCount
    readonly property int quickSettingsCount: quickSettingsModel.count
        
    function resetSwipeView() {
        if (root.mode === QuickSettings.Pages) {
            pageLoader.item.view.currentIndex = 0;
        }
    }

    // return to the first page when the action drawer is closed
    Connections {
        target: actionDrawer

        function onOpenedChanged() {
            if (!actionDrawer.opened) {
                resetSwipeView();
            }
        }
    }
    
    // view when fully open
    ColumnLayout {
        id: fullView
        opacity: root.fullViewProgress
        visible: opacity !== 0
        transform: Translate { y: (1 - fullView.opacity) * root.rowHeight }
        
        anchors.top: parent.top
        anchors.left: parent.left
        anchors.right: parent.right
        
        // Dynamically loads the appropriate view
        Loader {
            id: pageLoader
            
            Layout.fillWidth: true
            Layout.minimumHeight: rowCount * rowHeight

            asynchronous: true
            sourceComponent: root.mode === QuickSettings.Pages ? swipeViewComponent : scrollViewComponent
        }
        
        BrightnessItem {
            id: brightnessItem
            Layout.bottomMargin: PlasmaCore.Units.smallSpacing * 2
            Layout.leftMargin: PlasmaCore.Units.smallSpacing
            Layout.rightMargin: PlasmaCore.Units.smallSpacing
            Layout.fillWidth: true
        }
    }
    
    // view when in minimized mode
    RowLayout {
        id: minimizedView
        spacing: 0
        opacity: root.minimizedViewProgress
        visible: opacity !== 0
        transform: Translate { y: (1 - minimizedView.opacity) * -root.rowHeight }
        
        anchors.top: parent.top
        anchors.left: parent.left
        anchors.right: parent.right
        
        Repeater {
            model: MobileShell.PaginateModel {
                sourceModel: quickSettingsModel
                pageSize: minimizedColumns
            }
            delegate: Components.BaseItem {
                required property var modelData
                
                implicitHeight: root.minimizedRowHeight
                implicitWidth: root.minimizedColumnWidth
                horizontalPadding: (width - PlasmaCore.Units.gridUnit * 3) / 2
                verticalPadding: (height - PlasmaCore.Units.gridUnit * 3) / 2
                
                contentItem: QuickSettingsMinimizedDelegate {
                    restrictedPermissions: actionDrawer.restrictedPermissions
                    
                    text: modelData.text
                    status: modelData.status
                    icon: modelData.icon
                    enabled: modelData.enabled
                    settingsCommand: modelData.settingsCommand
                    toggleFunction: modelData.toggle
                    
                    onCloseRequested: {
                        actionDrawer.close();
                    }
                }
            }
        }
    }
    
    // Loads portrait quick settings view
    Component {
        id: swipeViewComponent
        
        ColumnLayout {
            readonly property var view: swipeView
            
            SwipeView {
                id: swipeView
                
                Layout.fillWidth: true
                Layout.preferredHeight: rowCount * rowHeight
                
                Repeater {
                    model: Math.ceil(quickSettingsCount / pageSize)
                    delegate: Flow {
                        id: flow
                        spacing: 0
                        
                        required property int index
                        
                        Repeater {
                            model: MobileShell.PaginateModel {
                                sourceModel: quickSettingsModel
                                pageSize: root.pageSize
                                firstItem: pageSize * flow.index
                            }
                            delegate: Loader {
                                required property var modelData
                                
                                asynchronous: true
                                
                                sourceComponent: quickSettingComponent
                            }
                        }
                    }
                }
            }
            
            Loader {
                id: indicatorLoader
                
                Layout.alignment: Qt.AlignCenter
                Layout.topMargin: PlasmaCore.Units.smallSpacing
                Layout.leftMargin: PlasmaCore.Units.smallSpacing
                Layout.rightMargin: PlasmaCore.Units.smallSpacing
                
                // Avoid wasting space when not loaded
                Layout.maximumHeight: active ? item.implicitHeight : 0
                
                active: swipeView.count > 1 ? true: false
                asynchronous: true
                
                sourceComponent: PageIndicator {
                    count: swipeView.count
                    currentIndex: swipeView.currentIndex
                        
                    delegate: Rectangle {
                        implicitWidth: 8
                        implicitHeight: count > 1 ? 8 : 0

                        radius: parent.width / 2
                        color: PlasmaCore.Theme.disabledTextColor

                        opacity: index === currentIndex ? 0.95 : 0.45
                    }
                }
            }
        }
    }
    
    // Loads landscape quick settings view
    Component {
        id: scrollViewComponent
        
        Item {
            width: parent.width
            height: rowCount * rowHeight
            
            Flickable {
                id: flickable
                anchors.fill: parent
                contentWidth: width
                contentHeight: flow.height
                
                clip: true
                
                ScrollIndicator.vertical: ScrollIndicator {
                    id: scrollIndicator
                    visible: quickSettingsCount > pageSize ? true : false
                    position: 0.1
                    
                    contentItem: Item {
                        implicitWidth: PlasmaCore.Units.smallSpacing / 4
                        Rectangle {
                            // shift over the indicator a bit to the right
                            anchors.fill: parent
                            anchors.leftMargin: 2
                            anchors.rightMargin: -2
                            
                            color: PlasmaCore.Theme.textColor
                            opacity: scrollIndicator.active ? 0.5 : 0
                            
                            Behavior on opacity { NumberAnimation {} }
                        }
                    }
                }
                
                Flow {
                    id: flow
                    width: parent.width
                    height: Math.ceil(quickSettingsCount / columnCount) * rowHeight
                    spacing: 0
                    
                    Repeater {
                        model: quickSettingsModel
                        delegate: Loader {
                            required property var modelData
                            
                            asynchronous: true
                            
                            sourceComponent: quickSettingComponent
                        }
                    }
                }
            }
        }
    }
    
    // Quick setting component
    Component {
        id: quickSettingComponent
        
        Components.BaseItem {
            height: root.rowHeight
            width: root.columnWidth
            padding: PlasmaCore.Units.smallSpacing

            contentItem: QuickSettingsFullDelegate {
                restrictedPermissions: actionDrawer.restrictedPermissions
                
                text: modelData.text
                status: modelData.status
                icon: modelData.icon
                enabled: modelData.enabled
                settingsCommand: modelData.settingsCommand
                toggleFunction: modelData.toggle
                
                onCloseRequested: {
                    actionDrawer.close();
                }
            }
        }
    }
}