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/*
  Copyright (C) 2016 Michael Bohlender, <michael.bohlender@kdemail.net>

  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 02110-1301, USA.
*/

import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Controls 1.4 as Controls
import QtQuick.Layouts 1.1

import org.kube.framework 1.0 as Kube

FocusScope {
    id: root
    //Private properties
    property variant parentFolder: null
    property bool isDraft : false
    property bool isImportant : false
    property bool isTrash : false
    property bool isUnread : false
    property variant currentMail: null

    onCurrentMailChanged: Kube.Fabric.postMessage(Kube.Messages.mailSelection, {"mail":currentMail})

    Kube.Listener {
        filter: Kube.Messages.folderSelection
        onMessageReceived: {
            parentFolder = message.folder
            currentMail = null
        }
    }

    Kube.Listener {
        filter: Kube.Messages.search
        onMessageReceived: {
            mailListModel.filter = message.filterString
        }
    }

    Shortcut {
        sequence: StandardKey.Delete
        enabled: !isTrash
        onActivated: Kube.Fabric.postMessage(Kube.Messages.moveToTrash, {"mail":currentMail})
    }

    Kube.Label {
        anchors.centerIn: parent
        visible: listView.count === 0
        //TODO depending on whether we synchronized already or not the label should change.
        text: qsTr("Nothing here...")
    }

    Kube.ListView {
        id: listView

        anchors.fill: parent
        clip: true
        focus: true

        ScrollBar.vertical: ScrollBar{
            id: scrollbar
        }

        //BEGIN keyboard nav
        onActiveFocusChanged: {
            if (activeFocus && currentIndex < 0) {
                currentIndex = 0
            }
        }

        Keys.onDownPressed: {
            incrementCurrentIndex()
        }
        Keys.onUpPressed: {
            decrementCurrentIndex()
        }
        //END keyboard nav

        onCurrentItemChanged: {
            if (currentItem) {
                root.currentMail = currentItem.currentData.mail;
                root.isDraft = currentItem.currentData.draft;
                root.isTrash = currentItem.currentData.trash;
                root.isImportant = currentItem.currentData.important;
                root.isUnread = currentItem.currentData.unread;
            }
        }

        model: Kube.MailListModel {
            id: mailListModel
            parentFolder: root.parentFolder
        }

        delegate: Kube.ListDelegate {
            id: delegateRoot
            //Required for D&D
            property var mail: model.mail

            width: scrollbar.visible ? listView.width - scrollbar.width : listView.width
            height: Kube.Units.gridUnit * 5

            color: Kube.Colors.viewBackgroundColor
            border.color: Kube.Colors.backgroundColor
            border.width: 1

            states: [
            State {
                name: "dnd"
                when: mouseArea.drag.active

                PropertyChanges {target: mouseArea; cursorShape: Qt.ClosedHandCursor}
                PropertyChanges {target: delegateRoot; x: x; y: y}
                PropertyChanges {target: delegateRoot; parent: root}
                PropertyChanges {target: delegateRoot; opacity: 0.7}
                PropertyChanges {target: delegateRoot; highlighted: true}
            }
            ]

            Drag.active: mouseArea.drag.active
            Drag.hotSpot.x: mouseArea.mouseX
            Drag.hotSpot.y: mouseArea.mouseY
            Drag.source: delegateRoot

            MouseArea {
                id: mouseArea
                anchors.fill: parent
                drag.target: parent
                onReleased: parent.Drag.drop()
                onClicked: delegateRoot.clicked()
            }

            Item {
                id: content

                anchors {
                    fill: parent
                    margins: Kube.Units.smallSpacing
                }
                property color unreadColor: (model.unread && !delegateRoot.highlighted) ? Kube.Colors.highlightColor : delegateRoot.textColor

//TODO batch editing
//                 Kube.CheckBox {
//                     id: checkBox
//
//                     anchors.verticalCenter: parent.verticalCenter
//                     visible: (checked || delegateRoot.hovered) && !mouseArea.drag.active
//                     opacity: 0.9
//                 }

                Column {
                    anchors {
                        verticalCenter: parent.verticalCenter
                        left: parent.left
                        leftMargin:  Kube.Units.largeSpacing // + checkBox.width
                    }

                    Kube.Label{
                        id: subject
                        width: content.width - Kube.Units.gridUnit * 3
                        text: model.subject
                        color: content.unreadColor
                        maximumLineCount: 2
                        wrapMode: Text.WordWrap
                        elide: Text.ElideRight
                    }

                    Kube.Label {
                        id: sender
                        text: model.senderName
                        color: delegateRoot.textColor
                        font.italic: true
                        width: delegateRoot.width - Kube.Units.gridUnit * 3
                        elide: Text.ElideRight
                    }
                }

                Kube.Label {
                    id: date
                    anchors {
                        right: parent.right
                        bottom: parent.bottom
                    }
                    visible: !delegateRoot.hovered
                    text: Qt.formatDateTime(model.date, "dd MMM yyyy")
                    font.italic: true
                    color: Kube.Colors.disabledTextColor
                    font.pointSize: Kube.Units.tinyFontSize
                }

                Kube.Label {
                    id: threadCounter
                    anchors.right: parent.right
                    text: model.threadSize
                    color: content.unreadColor
                    visible: model.threadSize > 1
                }
            }

            Row {
                id: buttons

                anchors {
                    right: parent.right
                    bottom: parent.bottom
                    margins: Kube.Units.smallSpacing
                }

                visible: delegateRoot.hovered && !mouseArea.drag.active

                spacing: Kube.Units.smallSpacing
                opacity: 0.7

                Kube.IconButton {
                    id: readButton
                    iconName: Kube.Icons.markAsRead
                    visible: model.unread
                    onClicked: Kube.Fabric.postMessage(Kube.Messages.markAsRead, {"mail": model.mail})
                    activeFocusOnTab: false
                }
                Kube.IconButton {
                    id: unreadButton
                    iconName: Kube.Icons.markAsUnread
                    visible: !model.unread
                    onClicked: Kube.Fabric.postMessage(Kube.Messages.markAsUnread, {"mail": model.mail})
                    activeFocusOnTab: false
                }

                Kube.IconButton {
                    id: importantButton
                    iconName: Kube.Icons.markImportant
                    visible: !!model.mail
                    onClicked: Kube.Fabric.postMessage(Kube.Messages.toggleImportant, {"mail": model.mail, "important": model.important})
                    activeFocusOnTab: false
                }

                Kube.IconButton {
                    id: deleteButton
                    iconName: Kube.Icons.moveToTrash
                    visible: !!model.mail
                    onClicked: Kube.Fabric.postMessage(Kube.Messages.moveToTrash, {"mail": model.mail})
                    activeFocusOnTab: false
                }

                Kube.IconButton {
                    id: restoreButton
                    iconName: Kube.Icons.undo
                    visible: !!model.trash
                    onClicked: Kube.Fabric.postMessage(Kube.Messages.restoreFromTrash, {"mail": model.mail})
                    activeFocusOnTab: false
                }
            }
        }
    }
}