/*
 * Copyright (C) 2018 The Qt Company Ltd.
 * Copyright (c) 2018-2019 TOYOTA MOTOR CORPORATION
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import QtQuick 2.6
import QtQuick.Layouts 1.1
import QtQuick.Controls 2.0

Page {
    id: root
    property alias model: listView.model

    property int currentPageIndex: 0

    property int nPullHeight: 100

    property int oldContentY: 0

    BusyIndicator {
        id: prevBusyIndicator
        anchors.horizontalCenter: parent.horizontalCenter
        implicitWidth: 60
        implicitHeight: 60
        running: false
    }
	BusyIndicator {
        id: nextBusyIndicator
        anchors.horizontalCenter: parent.horizontalCenter
		anchors.bottom: parent.bottom
        implicitWidth: 60
        implicitHeight: 60
        running: false
    }

    StackView {
        id: stack
        initialItem: listView
        anchors.fill: parent
        anchors.margins: root.width * 0.075
    }

    ListView {
        id: listView
        //anchors.fill: parent
        //anchors.margins: root.width * 0.075
        clip: true

        delegate: MouseArea {
            id: delegate
            width: listView.width
            height: width / 6

            RowLayout {
                anchors.fill: parent

                Item {
                    Layout.preferredWidth: 80
                    Layout.preferredHeight: 80

					MouseArea{
						anchors.fill: parent
						z: 2
						onClicked: {
							stack.push("qrc:/pages/DetailPage.qml", {stack: stack, model: model}, StackView.Immediate)
						}
					}

                    DImage {
                        id: imageicon
                        icon: model.icon
                        name: model.name
                    }
                }

                ColumnLayout {
                    Label {
                        Layout.fillWidth: true
                        text: model.name.toUpperCase()
                        color: '#00ADDC'
                    }
                    Label {
                        text: 'Version: ' + model.version
                        font.pixelSize: 16
                        font.italic: true
                    }
                    Label {
                        text: 'Description: ' + model.description
                        font.pixelSize: 16
                        wrapMode: Text.Wrap
                        elide: Text.ElideRight
                        Layout.preferredWidth: 400
                        Layout.preferredHeight: 40
                    }
                }
                ColumnLayout {
                    spacing: 5
                    Layout.alignment: Qt.AlignRight | Qt.AlignVCenter

                    Button {
						anchors.right: parent.right
						anchors.rightMargin: 6
						text: model.statetext
                        onClicked: {
                            if (model.statetext === 'Install' || model.statetext === 'Update') {
                                listView.model.install(model.index)
                            } else if (model.statetext === 'Launch') {
                                if (listView.model.launch(model.id) > 1) {
                                    homescreenHandler.tapShortcut(model.name)
                                } else {
                                    console.warn('app cannot be launched')
                                }
                            }
                        }
                        implicitWidth: 140
                        implicitHeight: 40
                    }
                }
            }

            DownloadBar {
                anchors.fill: parent
                progress: model.progress
            }
            Image {
                source: 'qrc:/images/DividingLine.svg'
                anchors.horizontalCenter: parent.horizontalCenter
                anchors.top: parent.top
                visible: model.index > 0
            }
        }

        onMovementStarted: {
            oldContentY = contentY
        }

        onFlickStarted: {
            if (contentY < -nPullHeight && prevBusyIndicator.running == false) {
                prevBusyIndicator.running = true
                listView.model.getPrevPage(currentPageIndex)
            } else if (nextBusyIndicator.running == false) {
                if ((contentHeight > 0) && (contentY > (contentHeight - height + nPullHeight))) {
                    nextBusyIndicator.running = true
                    listView.model.getNextPage(currentPageIndex)
                }
            }
        }
    }

    Connections {
        target: listView.model
        onRequestCompleted: {
            if (isPrev) {
                if (pageIndex > 0 && offsetSize == 0) {
                    listView.model.getPrevPage(pageIndex - 1)
                    return
                }
                currentPageIndex = pageIndex
                prevBusyIndicator.running = false
            } else {
                nextBusyIndicator.running = false

                if (listView.contentHeight > listView.height){
                    var itemHeight = listView.contentHeight / listView.count

                    if (offsetSize <= 0) {
                        listView.contentY = listView.contentHeight - listView.height
                    } else if (offsetSize < pageSize){
                        var viewCount = listView.height / itemHeight

                        if (offsetSize <= (viewCount / 2)) {
                            listView.contentY = oldContentY + (offsetSize * itemHeight)
                        } else {
                            listView.contentY = oldContentY + (listView.height / 2)
                        }
                    } else {
                        currentPageIndex = pageIndex
                    }
                }
            }
        }
    }
}