/*=====================================================================

QGroundControl Open Source Ground Control Station

(c) 2009, 2015 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>

This file is part of the QGROUNDCONTROL project

    QGROUNDCONTROL 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 3 of the License, or
    (at your option) any later version.

    QGROUNDCONTROL 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 QGROUNDCONTROL. If not, see <http://www.gnu.org/licenses/>.

======================================================================*/

import QtQuick                  2.5
import QtQuick.Controls         1.3
import QtQuick.Controls.Styles  1.2
import QtQuick.Dialogs          1.2
import QtLocation               5.3
import QtPositioning            5.2

import QGroundControl               1.0
import QGroundControl.FlightDisplay 1.0
import QGroundControl.FlightMap     1.0
import QGroundControl.ScreenTools   1.0
import QGroundControl.Controls      1.0
import QGroundControl.Palette       1.0
import QGroundControl.Vehicle       1.0
import QGroundControl.Controllers   1.0
import QGroundControl.FactSystem    1.0

/// Flight Display View
QGCView {
    id:             root
    viewPanel:      _panel

    QGCPalette { id: qgcPal; colorGroupEnabled: enabled }

    property var _activeVehicle:        QGroundControl.multiVehicleManager.activeVehicle
    property bool _mainIsMap:           _controller.hasVideo ? QGroundControl.loadBoolGlobalSetting(_mainIsMapKey,  true) : true
    property bool _isPipVisible:        _controller.hasVideo ? QGroundControl.loadBoolGlobalSetting(_PIPVisibleKey, true) : false

    property real _roll:                _activeVehicle ? _activeVehicle.roll.value    : _defaultRoll
    property real _pitch:               _activeVehicle ? _activeVehicle.pitch.value   : _defaultPitch
    property real _heading:             _activeVehicle ? _activeVehicle.heading.value : _defaultHeading


    property Fact _emptyFact:               Fact { }
    property Fact _groundSpeedFact:         _activeVehicle ? _activeVehicle.groundSpeed      : _emptyFact
    property Fact _airSpeedFact:            _activeVehicle ? _activeVehicle.airSpeed         : _emptyFact

    property bool activeVehicleJoystickEnabled: _activeVehicle ? _activeVehicle.joystickEnabled : false

    property real _savedZoomLevel:      0

    property real pipSize:              mainWindow.width * 0.2

    readonly property bool      isBackgroundDark:       _mainIsMap ? (_flightMap ? _flightMap.isSatelliteMap : true) : true
    readonly property real      _defaultRoll:           0
    readonly property real      _defaultPitch:          0
    readonly property real      _defaultHeading:        0
    readonly property real      _defaultAltitudeAMSL:   0
    readonly property real      _defaultGroundSpeed:    0
    readonly property real      _defaultAirSpeed:       0
    readonly property string    _mapName:               "FlightDisplayView"
    readonly property string    _showMapBackgroundKey:  "/showMapBackground"
    readonly property string    _mainIsMapKey:          "MainFlyWindowIsMap"
    readonly property string    _PIPVisibleKey:         "IsPIPVisible"

    FlightDisplayViewController { id: _controller }

    function setStates() {
        if(_mainIsMap) {
            //-- Adjust Margins
            _flightMapContainer.state   = "fullMode"
            _flightVideo.state          = "pipMode"
            //-- Save/Restore Map Zoom Level
            if(_savedZoomLevel != 0)
                _flightMap.zoomLevel = _savedZoomLevel
            else
                _savedZoomLevel = _flightMap.zoomLevel
        } else {
            //-- Adjust Margins
            _flightMapContainer.state   = "pipMode"
            _flightVideo.state          = "fullMode"
            //-- Set Map Zoom Level
            _savedZoomLevel = _flightMap.zoomLevel
            _flightMap.zoomLevel = _savedZoomLevel - 3
        }
    }

    function setPipVisibility(state) {
        _isPipVisible = state;
        QGroundControl.saveBoolGlobalSetting(_PIPVisibleKey, state)
    }

    function px4JoystickCheck() {
        if (_activeVehicle && !_activeVehicle.px4Firmware && (QGroundControl.virtualTabletJoystick || _activeVehicle.joystickEnabled)) {
            px4JoystickSupport.open()
        }
    }

    MessageDialog {
        id:     px4JoystickSupport
        text:   qsTr("Joystick support requires MAVLink MANUAL_CONTROL support. ") +
                qsTr("The firmware you are running does not normally support this. ") +
                qsTr("It will only work if you have modified the firmware to add MANUAL_CONTROL support.")
    }

    Connections {
        target: QGroundControl.multiVehicleManager
        onActiveVehicleChanged: px4JoystickCheck()
    }

    Connections {
        target: QGroundControl
        onVirtualTabletJoystickChanged: px4JoystickCheck()
    }

    onActiveVehicleJoystickEnabledChanged: px4JoystickCheck()

    Component.onCompleted: {
        widgetsLoader.source = "FlightDisplayViewWidgets.qml"
        setStates()
        px4JoystickCheck()
    }

    QGCViewPanel {
        id:             _panel
        anchors.fill:   parent

        //-- Map View
        //   For whatever reason, if FlightDisplayViewMap is the _panel item, changing
        //   width/height has no effect.
        Item {
            id: _flightMapContainer
            z:  _mainIsMap ? _panel.z + 1 : _panel.z + 2
            anchors.left:   _panel.left
            anchors.bottom: _panel.bottom
            visible:        _mainIsMap || _isPipVisible
            width:          _mainIsMap ? _panel.width  : pipSize
            height:         _mainIsMap ? _panel.height : pipSize * (9/16)
            states: [
                State {
                    name:   "pipMode"
                    PropertyChanges {
                        target:             _flightMapContainer
                        anchors.margins:    ScreenTools.defaultFontPixelHeight
                    }
                },
                State {
                    name:   "fullMode"
                    PropertyChanges {
                        target:             _flightMapContainer
                        anchors.margins:    0
                    }
                }
            ]
            FlightDisplayViewMap {
                id:             _flightMap
                anchors.fill:   parent
                flightWidgets:  widgetsLoader.item
            }
        }

        //-- Video View
        FlightDisplayViewVideo {
            id:             _flightVideo
            z:              _mainIsMap ? _panel.z + 2 : _panel.z + 1
            width:          !_mainIsMap ? _panel.width  : pipSize
            height:         !_mainIsMap ? _panel.height : pipSize * (9/16)
            anchors.left:   _panel.left
            anchors.bottom: _panel.bottom
            visible:        _controller.hasVideo && (!_mainIsMap || _isPipVisible)
            states: [
                State {
                    name:   "pipMode"
                    PropertyChanges {
                        target: _flightVideo
                        anchors.margins:    ScreenTools.defaultFontPixelHeight
                    }
                },
                State {
                    name:   "fullMode"
                    PropertyChanges {
                        target: _flightVideo
                        anchors.margins:    0
                    }
                }
            ]
        }

        QGCPipable {
            id:                 _flightVideoPipControl
            z:                  _flightVideo.z + 3
            width:              pipSize
            height:             pipSize * (9/16)
            anchors.left:       _panel.left
            anchors.bottom:     _panel.bottom
            anchors.margins:    ScreenTools.defaultFontPixelHeight
            visible:            _controller.hasVideo
            isHidden:           !_isPipVisible
            isDark:             isBackgroundDark
            onActivated: {
                _mainIsMap = !_mainIsMap
                setStates()
            }
            onHideIt: {
                setPipVisibility(!state)
            }
        }

        //-- Widgets
        Loader {
            id:             widgetsLoader
            z:              _panel.z + 4
            height:         ScreenTools.availableHeight
            anchors.left:   parent.left
            anchors.right:  parent.right
            anchors.bottom: parent.bottom
            asynchronous:   true
            visible:        status == Loader.Ready

            property bool isBackgroundDark: root.isBackgroundDark
            property var qgcView: root
        }

        //-- Virtual Joystick
        Loader {
            id:                         multiTouchItem
            z:                          _panel.z + 5
            width:                      parent.width  - (_flightVideoPipControl.width / 2)
            height:                     Math.min(ScreenTools.availableHeight * 0.25, ScreenTools.defaultFontPixelWidth * 16)
            visible:                    QGroundControl.virtualTabletJoystick
            anchors.bottom:             _flightVideoPipControl.top
            anchors.bottomMargin:       ScreenTools.defaultFontPixelHeight * 2
            anchors.horizontalCenter:   widgetsLoader.horizontalCenter
            source:                     "qrc:/qml/VirtualJoystick.qml"
            active:                     QGroundControl.virtualTabletJoystick
        }
    }
}