/****************************************************************************
 *
 *   (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 _transectsComponent: 	undefined
    property var _entryCoordinate: 	 	undefined
    property var _exitCoordinate: 		undefined
    property var _generatorVisuals: 	undefined

    property bool _isCurrentItem: _missionItem.isCurrentItem

    signal clicked(int sequenceNumber)

    on_EditingChanged: {
        _destroyEntryCoordinate()
        _destroyExitCoordinate()
        _destroyTransectsComponent()
        _destroyGeneratorVisuals()
    }

    Component.onCompleted: {
        _addEntryCoordinate()
        _addExitCoordinate()
        _addTransectsComponent()
        _addGeneratorVisuals()
        var bbox = boundingBox()
        _missionItem.areaData.initialize(bbox[0], bbox[1])
        console.assert(map != undefined, "please set the map property")
    }

    Component.onDestruction: {
        _destroyEntryCoordinate()
        _destroyExitCoordinate()
        _destroyTransectsComponent()
        _destroyGeneratorVisuals()
    }

    on_GeneratorChanged: {
        _destroyGeneratorVisuals()
        _addGeneratorVisuals()
    }

    // Transect lines
    Component {
        id: visualTransectsComponent

        MapPolyline {
            property var route: _missionItem.route
            line.color: "white"
            line.width: 2
            path:       route.length > 0 ? route : []
        }
    }

    // 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)
            }
        }
    }


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

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

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

    function _addTransectsComponent(){
        if (!_transectsComponent){
            _transectsComponent = visualTransectsComponent.createObject(_root)
            map.addMapItem(_transectsComponent)
        }
    }

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

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

    function _destroyEntryCoordinate(){
        if (_entryCoordinate){
            map.removeMapItem(_entryCoordinate)
            _entryCoordinate.destroy()
            _entryCoordinate = undefined
        }
    }

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

    function _destroyTransectsComponent(){
        if (_transectsComponent){
            map.removeMapItem(_transectsComponent)
            _transectsComponent.destroy()
            _transectsComponent = 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 ]
    }
}