/*
 *  Copyright 2019 Marco Martin <mart@kde.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  2.010-1301, USA.
 */

import QtQuick 2.4
import QtQuick.Layouts 1.1
import QtQuick.Controls 2.3 as Controls

import org.kde.plasma.plasmoid 2.0
import org.kde.plasma.core 2.0 as PlasmaCore
import org.kde.plasma.components 2.0 as PlasmaComponents
import org.kde.kquickcontrolsaddons 2.0


Controls.Control {
    id: root

    readonly property bool dragging: applicationsFlow.dragData
    property bool reorderingApps: false

    property int availableCellHeight: units.iconSizes.huge + reservedSpaceForLabel

    readonly property int reservedSpaceForLabel: metrics.height

    readonly property int cellWidth: applicationsFlow.width / Math.floor(applicationsFlow.width / ((availableCellHeight - reservedSpaceForLabel) + units.smallSpacing*4))
    readonly property int cellHeight: availableCellHeight - topPadding

    signal externalDragStarted
    signal dragPositionChanged(point pos)

    implicitHeight: applicationsFlow.implicitHeight + frame.margins.top + frame.margins.bottom

    leftPadding: frame.margins.left
    topPadding: frame.margins.top
    rightPadding: frame.margins.right
    bottomPadding: frame.margins.bottom

    background: PlasmaCore.FrameSvgItem {
        id: frame
        imagePath: "widgets/background"
        anchors.fill: parent

        Rectangle {
            y: root.cellHeight + frame.margins.top
            color: theme.textColor
            opacity: 0.3
            height: 1
            anchors {
                left: parent.left
                right: parent.right
                leftMargin: frame.margins.left
                rightMargin: frame.margins.right
            }
        }
    }

    contentItem: Item {
        //NOTE: TextMetrics can't handle multi line
        Controls.Label {
            id: metrics
            text: "M\nM"
            visible: false
        }

        //This Delegate is the placeholder for the "drag"
        //delegate (that is not actual drag and drop
        Delegate {
            id: dragDelegateItem
            z: 999
            width: root.cellWidth
            height: root.cellHeight
            onYChanged: dragPositionChanged(Qt.point(x, y))

            visible: modelData !== null
        }

        Flow {
            id: applicationsFlow
            anchors.fill: parent

            spacing: 0

            property var dragData
            property int startContentYDrag
            property bool viewHasBeenDragged


            NumberAnimation {
                id: scrollAnim
                target: applicationsFlow
                properties: "contentY"
                duration: units.longDuration
                easing.type: Easing.InOutQuad
            }
            move: Transition {
                NumberAnimation {
                    duration: units.longDuration
                    easing.type: Easing.InOutQuad
                    properties: "x,y"
                }
            }

            Repeater {
                model: plasmoid.nativeInterface.applicationListModel
                delegate: Delegate {
                    width: root.cellWidth
                    height: root.cellHeight
                    dragDelegate: dragDelegateItem
                }
            }
        }
    }
}