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

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

/// Flight Display View
Item {
    id: root

    QGCPalette { id: qgcPal; colorGroupEnabled: enabled }

    property real availableHeight: parent.height

    readonly property bool isBackgroundDark: _mainIsMap ? (_flightMap ? _flightMap.isSatelliteMap : true) : true

    property var _activeVehicle:    multiVehicleManager.activeVehicle

    readonly property real _defaultRoll:                0
    readonly property real _defaultPitch:               0
    readonly property real _defaultHeading:             0
    readonly property real _defaultAltitudeWGS84:       0
    readonly property real _defaultGroundSpeed:         0
    readonly property real _defaultAirSpeed:            0
    readonly property real _defaultClimbRate:           0

    readonly property string _mapName:                  "FlightDisplayView"
    readonly property string _showMapBackgroundKey:     "/showMapBackground"
    readonly property string _mainIsMapKey:             "MainFlyWindowIsMap"
    readonly property string _PIPVisibleKey:            "IsPIPVisible"

    property bool _mainIsMap:           QGroundControl.loadBoolGlobalSetting(_mainIsMapKey,  true)
    property bool _isPipVisible:        QGroundControl.loadBoolGlobalSetting(_PIPVisibleKey, true)

    property real _roll:                _activeVehicle ? (isNaN(_activeVehicle.roll)    ? _defaultRoll    : _activeVehicle.roll)    : _defaultRoll
    property real _pitch:               _activeVehicle ? (isNaN(_activeVehicle.pitch)   ? _defaultPitch   : _activeVehicle.pitch)   : _defaultPitch
    property real _heading:             _activeVehicle ? (isNaN(_activeVehicle.heading) ? _defaultHeading : _activeVehicle.heading) : _defaultHeading

    property real _altitudeWGS84:       _activeVehicle ? _activeVehicle.altitudeWGS84 : _defaultAltitudeWGS84
    property real _groundSpeed:         _activeVehicle ? _activeVehicle.groundSpeed   : _defaultGroundSpeed
    property real _airSpeed:            _activeVehicle ? _activeVehicle.airSpeed      : _defaultAirSpeed
    property real _climbRate:           _activeVehicle ? _activeVehicle.climbRate     : _defaultClimbRate

    property var  _savedZoomLevel:      0

    property real pipSize:              mainWindow.width * 0.2

    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)
    }

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

    //-- Map View
    //   For whatever reason, if FlightDisplayViewMap is the root item, changing
    //   width/height has no effect.
    Item {
        id: _flightMapContainer
        z:  _mainIsMap ? root.z + 1 : root.z + 2
        anchors.left:   root.left
        anchors.bottom: root.bottom
        visible:        _mainIsMap || _isPipVisible
        width:          _mainIsMap ? root.width  : pipSize
        height:         _mainIsMap ? root.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
        }
    }

    //-- Video View
    FlightDisplayViewVideo {
        id:             _flightVideo
        z:              _mainIsMap ? root.z + 2 : root.z + 1
        width:          !_mainIsMap ? root.width  : pipSize
        height:         !_mainIsMap ? root.height : pipSize * (9/16)
        anchors.left:   root.left
        anchors.bottom: root.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:       root.left
        anchors.bottom:     root.bottom
        anchors.margins:    ScreenTools.defaultFontPixelHeight
        isHidden:           !_isPipVisible
        isDark:             isBackgroundDark
        onActivated: {
            _mainIsMap = !_mainIsMap
            setStates()
        }
        onHideIt: {
            setPipVisibility(!state)
        }
    }

    //-- Widgets
    Loader {
        id:                 widgetsLoader
        z:                  root.z + 4
        anchors.right:      parent.right
        anchors.left:       parent.left
        anchors.bottom:     parent.bottom
        height:             availableHeight
        property bool isBackgroundDark: root.isBackgroundDark
    }

    //-- Virtual Joystick
    Item {
        id:                         multiTouchItem
        z:                          root.z + 5
        width:                      parent.width  - (_flightVideoPipControl.width / 2)
        height:                     thumbAreaHeight
        visible:                    QGroundControl.virtualTabletJoystick
        anchors.bottom:             _flightVideoPipControl.top
        anchors.bottomMargin:       ScreenTools.defaultFontPixelHeight * 2
        anchors.horizontalCenter:   parent.horizontalCenter

        readonly property real thumbAreaHeight: Math.min(parent.height * 0.25, ScreenTools.defaultFontPixelWidth * 16)

        QGCMapPalette { id: mapPal; lightColors: !isBackgroundDark }

        Timer {
            interval:   40  // 25Hz, same as real joystick rate
            running:    QGroundControl.virtualTabletJoystick && _activeVehicle
            repeat:     true
            onTriggered: {
                if (_activeVehicle) {
                    _activeVehicle.virtualTabletJoystickValue(rightStick.xAxis, rightStick.yAxis, leftStick.xAxis, leftStick.yAxis)
                }
            }
        }

        JoystickThumbPad {
            id:                     leftStick
            anchors.leftMargin:     xPositionDelta
            anchors.bottomMargin:   -yPositionDelta
            anchors.left:           parent.left
            anchors.bottom:         parent.bottom
            width:                  parent.thumbAreaHeight
            height:                 parent.thumbAreaHeight
            yAxisThrottle:          true
            lightColors:            !isBackgroundDark
        }

        JoystickThumbPad {
            id:                     rightStick
            anchors.rightMargin:    -xPositionDelta
            anchors.bottomMargin:   -yPositionDelta
            anchors.right:          parent.right
            anchors.bottom:         parent.bottom
            width:                  parent.thumbAreaHeight
            height:                 parent.thumbAreaHeight
            lightColors:            !isBackgroundDark
        }
    }
}