/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtEnginio module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
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** modification, are permitted provided that the following conditions are
** met:
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**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
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**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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****************************************************************************/

import QtQuick 2.1
import QtQuick.Controls 1.0
import Enginio 1.0

Rectangle {
    property string listId
    property string listName
    property var aclData
    property var usersData

    Component.onCompleted: {
        var aclQuery = enginioClient.query({ "objectType": "objects.todoLists", "id": listId }, Enginio.AccessControlOperation)
        aclQuery.finished.connect(function() {
            if (aclQuery.errorType === EnginioReply.NoError) {
                aclData = aclQuery.data

                usersDataChanged() //In case of aclQuery completes after usersQuery, signal also usersData change so UI re-updates correctly
            }
        })

        var usersQuery = enginioClient.query({ "objectType": "users", }, Enginio.UsersOperation)
        usersQuery.finished.connect(function() {
            if (usersQuery.errorType === EnginioReply.NoError) {
                usersData = usersQuery.data.results
            }
        })
    }

    Header {
        id: header
        text: listName + " admins"
    }

    ListView {
        id: nameView
        model: usersData
        anchors.top: header.bottom
        anchors.left: parent.left
        anchors.right: parent.right
        anchors.bottom: parent.bottom

        delegate: BorderImage {
            id: item

            width: parent.width ; height: 40 * scaleFactor
            source: mouse.pressed ? "qrc:images/delegate_pressed.png" : "qrc:images/delegate.png"
            border.left: 5; border.top: 5
            border.right: 5; border.bottom: 5

            Image {
                id: shadow
                anchors.top: parent.bottom
                width: parent.width
                visible: !mouse.pressed
                source: "qrc:images/shadow.png"
            }

            Item {
                id: checkBox
                height: 40 * scaleFactor
                width: 42 * scaleFactor
                Image {
                    anchors.centerIn: parent
                    fillMode: Image.PreserveAspectFit
                    source: isAccessGrantedForUser(modelData) ? "qrc:images/checkmark.png" : ""
                }
            }
            Text {
                anchors.left: checkBox.right
                anchors.verticalCenter: parent.verticalCenter
                text:  isUserTheLoggedInOne(modelData) ? modelData.username + " (current user)" : modelData.username
                font.pixelSize: 22 * scaleFactor
            }

            MouseArea {
                anchors.fill: parent
                onClicked: {
                    if (isUserTheLoggedInOne(modelData) === false){
                        toggleAccessGrantForUser(modelData)
                    }
                }
            }
        }
    }

    function isAccessGrantedForUser(userObject) {
        if (aclData){
            var aclAdmins = aclData.admin

            for (var i = 0; i < aclData.admin.length; ++i){
                if (aclAdmins[i].id === userObject.id){
                    return true;
                }
            }
        }

        return false;
    }

    function isUserTheLoggedInOne(userObject) {
        if ( userObject.username === enginioClient.identity.user){
                return true;
        }
        return false;
    }

    function toggleAccessGrantForUser(userObject) {
        var aclOperation
        var accessGrant =  {"admin": [{"id": userObject.id, "objectType": "users"}]}

        if (isAccessGrantedForUser(userObject)) {
            aclOperation = enginioClient.remove({ "id": listId, "objectType": "objects.todoLists", "access": accessGrant },
                                                  Enginio.AccessControlOperation)

        } else {
            aclOperation = enginioClient.update({ "id": listId, "objectType": "objects.todoLists", "access": accessGrant },
                                                  Enginio.AccessControlOperation)
        }

        aclOperation.finished.connect(function(reply) {
            if (aclOperation.errorType === EnginioReply.NoError) {
                aclData = reply.data
                usersDataChanged()
            }
        })
    }
}