/****************************************************************************
 *
 *   (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.
 *
 ****************************************************************************/

import QtQuick          2.3
import QtQuick.Controls 1.2
import QtLocation       5.3
import QtPositioning    5.3

import QGroundControl               1.0
import QGroundControl.ScreenTools   1.0
import QGroundControl.Palette       1.0
import QGroundControl.Controls      1.0
import QGroundControl.FlightMap     1.0

/// Survey Complex Mission Item visuals
Item {
    id: _root

    property var map: undefined        ///< Map control to place item in

    property var _missionItem:      object
    property bool _editing:         _missionItem.editing
    property var _generator:        _missionItem.generator

    property var _routeObject: 	undefined
    property var _entryCoordinateObject: 	 	undefined
    property var _exitCoordinateObject: 		undefined
    property var _generatorObject: 	undefined
    property var _entryArrowObject: 	undefined
    property var _exitArrowObject: 	undefined

    property bool _isCurrentItem: _missionItem.isCurrentItem

    signal clicked(int sequenceNumber)

//    on_EditingChanged: {
//        if (_editing){
//            _destroyEntryCoordinate()
//            _destroyExitCoordinate()
//            _destroyTransectsComponent()
//            _destroyGeneratorVisuals()
//        } else {
//            _addEntryCoordinate()
//            _addExitCoordinate()
//            _addTransectsComponent()
//            _addGeneratorVisuals()
//        }
//    }

    Component.onCompleted: {
        console.assert(map != undefined, "please set the map property")

        if (!_missionItem.initialized()){
            var bbox = boundingBox()
            _missionItem.initialize(bbox[0], bbox[1])
        }
        //        _addEntryCoordinate()
//        _addExitCoordinate()
        _addTransects()
        _addGeneratorVisuals()
        _addEntryArrow()
        _addExitArrow()
    }

    Component.onDestruction: {
//        _destroyEntryCoordinate()
//        _destroyExitCoordinate()
        _destroyTransects()
        _destroyGeneratorVisuals()
        _destroyEntryArrow()
        _destroyExitArrow()
    }

    on_GeneratorChanged: {
        _destroyGeneratorVisuals()
        _addGeneratorVisuals()
    }

    // Transect lines
    Component {
        id: visualTransectsComponent

        MapPolyline {
            visible: !_missionItem.editing
            line.color: "white"
            line.width: 2
            path:       _missionItem.route
            z:         QGroundControl.zOrderMapItems-1
        }
    }

    // Entry point
    Component {
        id: entryPointComponent

        MapQuickItem {
            anchorPoint.x:  sourceItem.anchorPointX
            anchorPoint.y:  sourceItem.anchorPointY
            z:              QGroundControl.zOrderMapItems
            coordinate:     _missionItem.coordinate
            visible:        _missionItem.exitCoordinate.isValid

            sourceItem: MissionItemIndexLabel {
                index:      _missionItem.sequenceNumber
                label:      "Entry"
                checked:    _missionItem.isCurrentItem
                onClicked:  _root.clicked(_missionItem.sequenceNumber)
            }
        }
    }

    // Exit point
    Component {
        id: exitPointComponent

        MapQuickItem {
            anchorPoint.x:  sourceItem.anchorPointX
            anchorPoint.y:  sourceItem.anchorPointY
            z:              QGroundControl.zOrderMapItems
            coordinate:     _missionItem.exitCoordinate
            visible:        _missionItem.exitCoordinate.isValid

            sourceItem: MissionItemIndexLabel {
                index:      _missionItem.lastSequenceNumber
                label:      "Exit"
                checked:    _missionItem.isCurrentItem
                onClicked:  _root.clicked(_missionItem.sequenceNumber)
            }
        }
    }

    // Entry arrow
    Component {
        id: entryArrowComponent

        MapLineArrow {
            property int length: _missionItem.route.length
            property var route: _missionItem.route

            fromCoord:      length > 1 ? route[0] : QtPositioning.coordinate()
            toCoord:        length > 1 ? route[1] : QtPositioning.coordinate()
            arrowPosition:  2
            visible: length > 1 && !_missionItem.editing
            opacity: _root.opacity
        }
    }

    // Exit arrow
    Component {
        id: exitArrowComponent

        MapLineArrow {
            property int length: _missionItem.route.length
            property var route: _missionItem.route

            fromCoord:      length > 3 ? route[length-2] : QtPositioning.coordinate()
            toCoord:        length > 3 ? route[length-1] : QtPositioning.coordinate()
            arrowPosition:  2
            visible: length > 3 && !_missionItem.editing
            opacity:        _root.opacity
        }
    }

    // GeoAreas
    Repeater {
        model: _missionItem.areaData.areaList
        delegate: GeoAreaVisualLoader {
            map:                _root.map
            geoArea: 			object
        }
    }

    // Generator visuals
    function _addGeneratorVisuals(){
        if (_generator && _generator.mapVisualQml && !_generatorObject) {
            var component = Qt.createComponent(_generator.mapVisualQml)
            if (component.status === Component.Error) {
                console.log("Error loading Qml: ",
                            _generator.mapVisualQml, component.errorString())
            } else {
                _generatorObject = component.createObject(_root, {
                                                               "map": _root.map,
                                                               "generator": _root._generator,
                                                               "checked": Qt.binding(function(){return _root._isCurrentItem})
                                                           })
                _generatorObject.clicked.connect(
                            function(){_root.clicked(_missionItem.sequenceNumber)})
            }
        }
    }

    function _destroyGeneratorVisuals(){
        if(_generatorObject){
            _generatorObject.destroy()
            _generatorObject = undefined
        }
    }

    function _addTransects(){
        if (!_routeObject){
            _routeObject= visualTransectsComponent.createObject(_root)
            map.addMapItem(_routeObject)
        }
    }

    function _addExitCoordinate(){
        if (!_exitCoordinateObject){
            _exitCoordinateObject = exitPointComponent.createObject(_root)
            map.addMapItem(_exitCoordinateObject)
        }
    }

    function _addEntryCoordinate(){
        if (!_entryCoordinateObject){
            _entryCoordinateObject = entryPointComponent.createObject(_root)
            map.addMapItem(_entryCoordinateObject)
        }
    }

    function _addEntryArrow(){
        if (!_entryArrowObject){
            _entryArrowObject = entryArrowComponent.createObject(_root)
            map.addMapItem(_entryArrowObject)
        }
    }

    function _addExitArrow(){
        if (!_exitArrowObject){
            _exitArrowObject = exitArrowComponent.createObject(_root)
            map.addMapItem(_exitArrowObject)
        }
    }
    function _destroyEntryCoordinate(){
        if (_entryCoordinateObject){
            map.removeMapItem(_entryCoordinateObject)
            _entryCoordinateObject.destroy()
            _entryCoordinateObject = undefined
        }
    }

    function _destroyExitCoordinate(){
        if (_exitCoordinateObject){
            map.removeMapItem(_exitCoordinateObject)
            _exitCoordinateObject.destroy()
            _exitCoordinateObject = undefined
        }
    }

    function _destroyTransects(){
        if (_routeObject){
            map.removeMapItem(_routeObject)
            _routeObject.destroy()
            _routeObject= undefined
        }
    }

    function _destroyEntryArrow(){
        if (_entryArrowObject){
            map.removeMapItem(_entryArrowObject)
            _entryArrowObject.destroy()
            _entryArrowObject = undefined
        }
    }

    function _destroyExitArrow(){
        if (_exitArrowObject){
            map.removeMapItem(_exitArrowObject)
            _exitArrowObject.destroy()
            _exitArrowObject = undefined
        }
    }

    function boundingBox() {
        // Initial polygon is inset to take 2/3rds space
        var rect = Qt.rect(map.centerViewport.x,
                           map.centerViewport.y,
                           map.centerViewport.width,
                           map.centerViewport.height)
        rect.x += (rect.width * 0.25) / 2
        rect.y += (rect.height * 0.25) / 2
        rect.width *= 0.75
        rect.height *= 0.75

        var centerCoord =       map.toCoordinate(Qt.point(rect.x + (rect.width / 2),
                                                          rect.y + (rect.height / 2)),
                                                 false /* clipToViewPort */)
        var topRightCoord =     map.toCoordinate(Qt.point(rect.x + rect.width, rect.y),                             false /* clipToViewPort */)
        var bottomLeftCoord =   map.toCoordinate(Qt.point(rect.x, rect.y + rect.height),                            false /* clipToViewPort */)
        var topLeftCoord =      map.toCoordinate(Qt.point(rect.x, rect.y),                                          false /* clipToViewPort */)
        var bottomRightCoord =  map.toCoordinate(Qt.point(rect.x + rect.width, rect.y + rect.height),               false /* clipToViewPort */)

        // Initial polygon has max width and height of 3000 meters
        var halfWidthMeters =   Math.min(topLeftCoord.distanceTo(topRightCoord), 3000) / 2
        var halfHeightMeters =  Math.min(topLeftCoord.distanceTo(bottomLeftCoord), 3000) / 2
        topRightCoord =     centerCoord.atDistanceAndAzimuth(halfWidthMeters, 90).atDistanceAndAzimuth(halfHeightMeters, 0)
        bottomLeftCoord =   centerCoord.atDistanceAndAzimuth(halfWidthMeters, -90).atDistanceAndAzimuth(halfHeightMeters, 180)

        return [  bottomLeftCoord, topRightCoord ]
    }
}