/****************************************************************************
 *
 *   (c) 2009-2016 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
 *
 * QGroundControl is licensed according to the terms in the file
 * COPYING.md in the root of the source code directory.
 *
 ****************************************************************************/


/**
 * @file
 *   @brief QGC Map Background
 *   @author Gus Grubba <mavlink@grubba.com>
 */

import QtQuick          2.4
import QtQuick.Controls 1.3
import QtLocation       5.3
import QtPositioning    5.3

import QGroundControl                       1.0
import QGroundControl.FactSystem            1.0
import QGroundControl.Controls              1.0
import QGroundControl.FlightMap             1.0
import QGroundControl.ScreenTools           1.0
import QGroundControl.MultiVehicleManager   1.0
import QGroundControl.Vehicle               1.0
import QGroundControl.Mavlink               1.0

Map {
    id: _map

    property string mapName:            'defaultMap'
    property bool   isSatelliteMap:     activeMapType.name.indexOf("Satellite") > -1 || activeMapType.name.indexOf("Hybrid") > -1

    readonly property real  maxZoomLevel: 20
    property variant        scaleLengths: [5, 10, 25, 50, 100, 150, 250, 500, 1000, 2000, 5000, 10000, 20000, 50000, 100000, 200000, 500000, 1000000, 2000000]

    function formatDistance(meters)
    {
        var dist = Math.round(meters)
        if (dist > 1000 ){
            if (dist > 100000){
                dist = Math.round(dist / 1000)
            }
            else{
                dist = Math.round(dist / 100)
                dist = dist / 10
            }
            dist = dist + " km"
        }
        else{
            dist = dist + " m"
        }
        return dist
    }

    function calculateScale() {
        var coord1, coord2, dist, text, f
        f = 0
        coord1 = _map.toCoordinate(Qt.point(0, scale.y))
        coord2 = _map.toCoordinate(Qt.point(0 + scaleImage.sourceSize.width, scale.y))
        dist = Math.round(coord1.distanceTo(coord2))
        if (dist === 0) {
            // not visible
        } else {
            for (var i = 0; i < scaleLengths.length - 1; i++) {
                if (dist < (scaleLengths[i] + scaleLengths[i+1]) / 2 ) {
                    f = scaleLengths[i] / dist
                    dist = scaleLengths[i]
                    break;
                }
            }
            if (f === 0) {
                f = dist / scaleLengths[i]
                dist = scaleLengths[i]
            }
        }
        text = formatDistance(dist)
        scaleImage.width = (scaleImage.sourceSize.width * f) - 2 * scaleImageLeft.sourceSize.width
        scaleText.text = text
    }

    function setVisibleRegion(region) {
        // This works around a bug on Qt where if you set a visibleRegion and then the user moves or zooms the map
        // and then you set the same visibleRegion the map will not move/scale appropriately since it thinks there
        // is nothing to do.
        _map.visibleRegion = QtPositioning.rectangle(QtPositioning.coordinate(0, 0), QtPositioning.coordinate(0, 0))
        _map.visibleRegion = region
    }

    zoomLevel:                  18
    center:                     QGroundControl.lastKnownHomePosition
    gesture.flickDeceleration:  3000

    plugin: Plugin { name: "QGroundControl" }

    ExclusiveGroup { id: mapTypeGroup }

    property bool _initialMapPositionSet: false

    Connections {
        target: mainWindow
        onGcsPositionChanged: {
            if (!_initialMapPositionSet) {
                _initialMapPositionSet = true
                center = mainWindow.gcsPosition
            }
        }
    }

    function updateActiveMapType() {
        var fullMapName = QGroundControl.flightMapSettings.mapProvider + " " + QGroundControl.flightMapSettings.mapType
        for (var i = 0; i < _map.supportedMapTypes.length; i++) {
            if (fullMapName === _map.supportedMapTypes[i].name) {
                _map.activeMapType = _map.supportedMapTypes[i]
                return
            }
        }
    }

    Component.onCompleted: updateActiveMapType()

    Connections {
        target:             QGroundControl.flightMapSettings
        onMapTypeChanged:   updateActiveMapType()
    }

    /// Ground Station location
    MapQuickItem {
        anchorPoint.x:  sourceItem.anchorPointX
        anchorPoint.y:  sourceItem.anchorPointY
        visible:        mainWindow.gcsPosition.isValid
        coordinate:     mainWindow.gcsPosition
        sourceItem:     MissionItemIndexLabel {
            label: "Q"
        }
    }
} // Map