# -*- coding: utf-8 -*-
# noinspection PyPep8Naming
"""
/***************************************************************************
                              EO Time Series Viewer
                              -------------------
        begin                : 2015-08-20
        git sha              : $Format:%H$
        copyright            : (C) 2017 by HU-Berlin
        email                : benjamin.jakimow@geo.hu-berlin.de
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program 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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
"""


import os, sys, re, fnmatch, collections, copy, traceback, bisect
from qgis.core import *
from qgis.core import QgsContrastEnhancement, QgsRasterShader, QgsColorRampShader,  QgsProject, QgsCoordinateReferenceSystem, \
    QgsRasterLayer, QgsVectorLayer, QgsMapLayer, QgsMapLayerProxyModel, QgsColorRamp, QgsSingleBandPseudoColorRenderer

from qgis.gui import *
from qgis.gui import QgsDockWidget, QgsMapCanvas, QgsMapTool, QgsCollapsibleGroupBox
from PyQt5.QtXml import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
import numpy as np
from .utils import *
from .import Option, OptionListModel
from .timeseries import SensorInstrument, TimeSeriesDate, TimeSeries, SensorProxyLayer
from .utils import loadUI
from .mapviewscrollarea import MapViewScrollArea
from .mapcanvas import MapCanvas, MapTools, MapCanvasInfoItem, MapCanvasMapTools

from .externals.qps.crosshair.crosshair import getCrosshairStyle, CrosshairStyle, CrosshairMapCanvasItem
from .externals.qps.layerproperties import showLayerPropertiesDialog
from .externals.qps.maptools import *

#assert os.path.isfile(dummyPath)
#lyr = QgsRasterLayer(dummyPath)
#assert lyr.isValid()
DUMMY_RASTERINTERFACE = QgsSingleBandGrayRenderer(None, 0)

KEY_LOCKED_LAYER = 'eotsv/locked'
KEY_SENSOR_GROUP = 'eotsv/sensorgroup'
KEY_SENSOR_LAYER = 'eotsv/sensorlayer'


def equalTextFormats(tf1:QgsTextFormat, tf2:QgsTextFormat)->True:
    return tf1.toMimeData().text() == tf2.toMimeData().text()

class MapViewLayerTreeViewMenuProvider(QgsLayerTreeViewMenuProvider):

    def __init__(self, mapView, view: QgsLayerTreeView, canvas: QgsMapCanvas):
        super(MapViewLayerTreeViewMenuProvider, self).__init__()
        assert isinstance(view, QgsLayerTreeView)
        assert isinstance(canvas, QgsMapCanvas)
        self.mLayerTreeView = view
        self.mDummyCanvas = canvas
        self.mDefActions = QgsLayerTreeViewDefaultActions(self.mLayerTreeView)
        self.mMapView = mapView

        self.actionAddGroup = self.mDefActions.actionAddGroup()
        self.actionRename = self.mDefActions.actionRenameGroupOrLayer()
        self.actionRemove = self.mDefActions.actionRemoveGroupOrLayer()
        #self.actionZoomToLayer = self.mDefActions.actionZoomToGroup(self.mDummyCanvas)
        self.actionCheckAndAllChildren = self.mDefActions.actionCheckAndAllChildren()
        self.actionShowFeatureCount = self.mDefActions.actionShowFeatureCount()
        #self.actionZoomToLayer = self.mDefActions.actionZoomToLayer(self.mDummyCanvas)
        #self.actionZoomToSelected = self.mDefActions.actionZoomToSelection(self.mDummyCanvas)
        #self.actionZoomToGroup = self.mDefActions.actionZoomToGroup(self.mDummyCanvas)
        self.actionAddEOTSVSpectralProfiles = QAction('Add Spectral Profile Layer')

        self.actionAddEOTSVTemporalProfiles = QAction('Add Temporal Profile Layer')

    def mapView(self):
        return self.mMapView

    def layerTreeView(self)->QgsLayerTreeView:
        return self.mLayerTreeView

    def layerTree(self)->QgsLayerTree:
        return self.layerTreeModel().rootGroup()

    def layerTreeModel(self)->QgsLayerTreeModel:
        return self.layerTreeView().model()

    def createContextMenu(self)->QMenu:

        model = self.layerTreeModel()
        ltree = self.layerTree()
        view = self.layerTreeView()
        g = view.currentGroupNode()
        l = view.currentLayer()
        i = view.currentIndex()
        #fixedNodes = len([l for l in view.selectedLayersRecursive() if l.property(KEY_LOCKED_LAYER) == True]) > 0 or \
        #             isinstance(g, QgsLayerTreeGroup) and g.property(KEY_LOCKED_LAYER) == True

        # disable actions
        #self.actionRemove.setEnabled(fixedNodes == False)

        menu = QMenu(view)
        isSensorGroup = isinstance(g, QgsLayerTreeGroup) and g.customProperty(KEY_SENSOR_GROUP) in [True, 'true']
        isSensorLayer = isinstance(l, QgsRasterLayer) and l.customProperty(KEY_SENSOR_LAYER) in [True, 'true']
        self.actionRemove.setEnabled(not (isSensorGroup or isSensorLayer))
        self.actionAddGroup.setEnabled(not (isSensorGroup or isSensorLayer))
        menu.addAction(self.actionAddGroup)
        menu.addAction(self.actionRename)
        menu.addAction(self.actionRemove)

        #menu.addAction(self.actionZoomToGroup)
        #menu.addAction(self.actionZoomToLayer)
        #menu.addAction(self.actionZoomToSelected)

        menu.addSeparator()

        menu.addAction(self.actionAddEOTSVSpectralProfiles)
        menu.addAction(self.actionAddEOTSVTemporalProfiles)

        menu.addSeparator()

        centerCanvas = None
        if isinstance(self.mapView(), MapView):
            visibleCanvases = self.mapView().visibleMapCanvases()
            if len(visibleCanvases) > 0:
                i = int(len(visibleCanvases) / 2)
                centerCanvas = visibleCanvases[i]

        a = menu.addAction('Set Properties')

        a.triggered.connect(lambda *args,
                                   canvas = centerCanvas,
                                   lyr = l,
                                   b = not isinstance(l, SensorProxyLayer):
                            showLayerPropertiesDialog(lyr, canvas, useQGISDialog=b))

        a.setEnabled(isinstance(centerCanvas, QgsMapCanvas))

        from .externals.qps.layerproperties import pasteStyleFromClipboard, pasteStyleToClipboard
        a = menu.addAction('Copy Style')
        a.setToolTip('Copy the current layer style to clipboard')
        a.triggered.connect(lambda *args, lyr=l: pasteStyleToClipboard(lyr))

        a = menu.addAction('Paste Style')
        a.setEnabled('application/qgis.style' in QApplication.clipboard().mimeData().formats())
        a.triggered.connect(lambda *args, lyr=l: pasteStyleFromClipboard(lyr))

        #a = menu.addAction('Settings')
        #from qps.layerproperties import showLayerPropertiesDialog
        #a.triggered.connect(lambda *args, lyr=l:showLayerPropertiesDialog(lyr, self._canvas))

        return menu

class MapViewLayerTreeModel(QgsLayerTreeModel):
    """
    Layer Tree as shown in a MapView
    """
    def __init__(self, rootNode, parent=None):
        super(MapViewLayerTreeModel, self).__init__(rootNode, parent=parent)

    def dataXXX(self, index:QModelIndex, role=Qt.DisplayRole):
        node = self.index2node(index)
        # if node.name() == 'testlayer':
        #     s = ""

        if True:
            if isinstance(node, QgsLayerTreeGroup) and node.customProperty(KEY_SENSOR_GROUP) in ['true', True]:
                if role == Qt.FontRole:
                    f = super(MapViewLayerTreeModel, self).data(index, role=role)
                    f.setBold(True)
                    return f
            if isinstance(node, QgsLayerTreeLayer) and node.customProperty(KEY_SENSOR_LAYER) in ['true', True]:

                if role == Qt.FontRole:
                    f = super(MapViewLayerTreeModel, self).data(index, role=role)
                    assert isinstance(f, QFont)
                    f.setItalic(True)
                    return f

                if role == Qt.DecorationRole:
                    return QIcon(':/timeseriesviewer/icons/icon.svg')

        return super(MapViewLayerTreeModel, self).data(index, role=role)

    def flagsXXX(self, index:QModelIndex):

        f = super(MapViewLayerTreeModel, self).flags(index)

        node = self.index2node(index)
        if isinstance(node, QgsLayerTreeNode) and ( \
                node.customProperty(KEY_SENSOR_LAYER) in ['true', True] or \
                node.customProperty(KEY_SENSOR_GROUP) in ['true', True]):
            f = f ^ Qt.ItemIsDragEnabled
            f = f ^ Qt.ItemIsDropEnabled

        return f


class MapView(QFrame, loadUIFormClass(jp(DIR_UI, 'mapview.ui'))):
    """
    A MapView defines how a single map canvas visualizes sensor specific EOTS data plus additional vector overlays
    """
    #sigVisibilityChanged = pyqtSignal(bool)
    sigCanvasAppearanceChanged = pyqtSignal()
    sigCrosshairChanged = pyqtSignal()
    sigTitleChanged = pyqtSignal(str)
    sigSensorRendererChanged = pyqtSignal(SensorInstrument, QgsRasterRenderer)

    sigShowProfiles = pyqtSignal(SpatialPoint, MapCanvas, str)

    def __init__(self, name='Map View', parent=None):
        super(MapView, self).__init__(parent)
        self.setupUi(self)

        from eotimeseriesviewer.settings import DEFAULT_VALUES, Keys

        self.mMapBackgroundColor = DEFAULT_VALUES[Keys.MapBackgroundColor]
        self.mMapTextFormat = DEFAULT_VALUES[Keys.MapTextFormat]
        self.mCurrentLayer = None
        self.mMapWidget = None
        self.mTimeSeries = None
        self.mSensorLayerList = list()
        self.mCrossHairStyle = CrosshairStyle()

        m = QMenu(self.btnToggleCrosshair)
        m.addAction(self.actionSetCrosshairStyle)

        self.btnToggleCrosshair.setMenu(m)
        self.btnToggleCrosshair.setDefaultAction(self.actionToggleCrosshairVisibility)
        self.btnToggleCrosshair.setChecked(self.crosshairStyle().mShow)
        self.btnToggleMapViewVisibility.setDefaultAction(self.actionToggleMapViewHidden)

        self.tbName.textChanged.connect(self.onTitleChanged)

        self.actionSetCrosshairStyle.triggered.connect(self.onChangeCrosshairStyle)
        self.actionToggleMapViewHidden.toggled.connect(self.sigCanvasAppearanceChanged)
        self.actionToggleCrosshairVisibility.toggled.connect(self.setCrosshairVisibility)

        self.actionAddMapLayer.triggered.connect(lambda *args: self.onAddMapLayer())
        self.actionAddVectorLayer.triggered.connect(lambda *args: self.onAddMapLayer(QgsMapLayerProxyModel.VectorLayer))
        self.actionAddRasterLayer.triggered.connect(lambda *args: self.onAddMapLayer(QgsMapLayerProxyModel.RasterLayer))
        self.btnAddLayer.setDefaultAction(self.actionAddMapLayer)
        m = QMenu()
        m.addAction(self.actionAddVectorLayer)
        m.addAction(self.actionAddRasterLayer)
        self.btnAddLayer.setMenu(m)

        self.btnHighlightMapView.setDefaultAction(self.actionHighlightMapView)
        self.actionHighlightMapView.triggered.connect(lambda: self.setHighlighted(True, timeout=500))







        assert isinstance(self.mLayerTreeView, QgsLayerTreeView)

        self.mDummyCanvas = QgsMapCanvas() # dummy map canvas for dummy layers
        self.mDummyCanvas.setVisible(False)

        self.mLayerTree = QgsLayerTree()
        self.mLayerTreeMapCanvasBridget = QgsLayerTreeMapCanvasBridge(self.mLayerTree, self.mDummyCanvas)

        # self.mLayerTreeModel = QgsLayerTreeModel(self.mLayerTree)
        self.mLayerTreeModel = MapViewLayerTreeModel(self.mLayerTree)

        self.mLayerTreeModel.setFlags(QgsLayerTreeModel.AllowNodeChangeVisibility |
                                      QgsLayerTreeModel.AllowNodeRename |
                                      QgsLayerTreeModel.AllowNodeReorder)

        self._createSensorNode()

        self.mLayerTreeView.setModel(self.mLayerTreeModel)
        self.mMapLayerTreeViewMenuProvider = MapViewLayerTreeViewMenuProvider(self, self.mLayerTreeView, self.mDummyCanvas)

        # register some actions that interact with other GUI elements
        self.mMapLayerTreeViewMenuProvider.actionAddEOTSVSpectralProfiles.triggered.connect(self.addSpectralProfileLayer)
        self.mMapLayerTreeViewMenuProvider.actionAddEOTSVTemporalProfiles.triggered.connect(self.addTemporalProfileLayer)

        self.mLayerTreeView.setMenuProvider(self.mMapLayerTreeViewMenuProvider)
        self.mLayerTreeView.currentLayerChanged.connect(self.setCurrentLayer)
        self.mLayerTree.removedChildren.connect(self.onChildNodesRemoved)

        self.mIsVisible = True
        self.setTitle(name)

        m = QMenu()
        m.addAction(self.optionShowDate)
        m.addAction(self.optionShowSensorName)
        m.addAction(self.optionShowMapViewName)
        self.btnInfoOptions.setMenu(m)

        for action in m.actions():
            action.toggled.connect(self.sigCanvasAppearanceChanged)

        fixMenuButtons(self)


    def setName(self, name:str):
        self.setTitle(name)

    def name(self)->str:
        return self.title()

    def setMapTextFormat(self, textformat:QgsTextFormat)->QgsTextFormat:

        if not equalTextFormats(self.mapTextFormat(), textformat):
            self.mMapTextFormat = textformat
            self.sigCanvasAppearanceChanged.emit()
        return self.mapTextFormat()

    def mapTextFormat(self)->QgsTextFormat:
        return self.mMapTextFormat

    def mapBackgroundColor(self)->QColor:
        """
        Returns the map background color
        :return: QColor
        """
        return self.mMapBackgroundColor

    def setMapBackgroundColor(self, color:QColor)->QColor:
        """
        Sets the map background color
        :param color: QColor
        :return: QColor
        """
        if self.mMapBackgroundColor != color:
            self.mMapBackgroundColor = color
            self.sigCanvasAppearanceChanged.emit()
        return self.mMapBackgroundColor


    def visibleMapCanvases(self)->list:
        """
        Returns the currently visible mapcanvases
        :return: [list-of-MapCanvases]
        """
        return [m for m in self.mapCanvases() if m.isVisibleToViewport()]


    def onAddMapLayer(self, filter:QgsMapLayerProxyModel.Filter=QgsMapLayerProxyModel.All):
        """
        Slot that opens a SelectMapLayersDialog for any kind of layer
        """
        from .externals.qps.utils import SelectMapLayersDialog
        d = SelectMapLayersDialog()

        if filter == QgsMapLayerProxyModel.All:
            title = 'Select Layer'
            text = 'Layer'
        elif filter == QgsMapLayerProxyModel.RasterLayer:
            title = 'Select Raster Layer'
            text = 'Raster'
        elif filter == QgsMapLayerProxyModel.VectorLayer:
            title = 'Select Vector Layer'
            text = 'Vector'
        d.setWindowTitle(title)
        d.addLayerDescription(text, filter)
        if d.exec() == QDialog.Accepted:
            for l in d.mapLayers():
                self.addLayer(l)

    def setCurrentLayer(self, layer:QgsMapLayer):
        """
        Sets the QgsMapCanvas.currentLayer() that is used by some QgsMapTools
        :param layer: QgsMapLayer | None
        :return:
        """
        assert layer is None or isinstance(layer, QgsMapLayer)

        self.mCurrentLayer = layer

        if layer not in self.mSensorLayerList:
            for c in self.mapCanvases():
                c.setCurrentLayer(layer)
        else:
            s = ""



    def addSpectralProfileLayer(self):
        """Adds the EOTSV Spectral Profile Layer"""
        from eotimeseriesviewer.main import TimeSeriesViewer
        tsv = TimeSeriesViewer.instance()
        if isinstance(tsv, TimeSeriesViewer):
            lyr = tsv.spectralLibrary()
            if lyr not in self.layers():
                self.addLayer(lyr)

    def addTemporalProfileLayer(self):
        """Adds the EOTSV Temporal Profile Layer"""
        from eotimeseriesviewer.main import TimeSeriesViewer
        tsv = TimeSeriesViewer.instance()
        if isinstance(tsv, TimeSeriesViewer):
            lyr = tsv.temporalProfileLayer()
            if lyr not in self.layers():
                self.addLayer(lyr)


    def addLayer(self, layer:QgsMapLayer):
        """
        Add a QgsMapLayer to the MapView layer tree
        :param layer: QgsMapLayer
        """
        if isinstance(layer, QgsVectorLayer):
            self.mLayerTree.insertLayer(0, layer)
        else:
            self.mLayerTree.addLayer(layer)

    def _createSensorNode(self):
        self.mLayerTreeSensorNode = QgsLayerTreeGroup(name='Raster Time Series', checked=True)
        self.mLayerTreeSensorNode.setCustomProperty(KEY_LOCKED_LAYER, True)
        self.mLayerTreeSensorNode.setCustomProperty(KEY_SENSOR_GROUP, True)
        self.mLayerTree.addChildNode(self.mLayerTreeSensorNode)

    def _containsSensorNode(self, root:QgsLayerTreeGroup)->bool:
        assert isinstance(root, QgsLayerTreeGroup)
        if root.customProperty(KEY_SENSOR_GROUP) in [True, 'true']:
            return True
        for grp in root.findGroups():
            if self._containsSensorNode(grp):
                return True
        return False

    def onChildNodesRemoved(self, node, idxFrom, idxTo):
        if not self._containsSensorNode(self.mLayerTreeModel.rootGroup()):
            self._createSensorNode()

    def onChangeCrosshairStyle(self):

        canvases = self.mapCanvases()
        if len(canvases) > 0:
            mapCanvas = canvases[0]
        else:
            mapCanvas = None

        style = getCrosshairStyle(parent=self, crosshairStyle=self.crosshairStyle(), mapCanvas=mapCanvas)
        if isinstance(style, CrosshairStyle):
            self.setCrosshairStyle(style)

    def setVisibility(self, b: bool):
        """
        Sets the map view visibility
        :param b: bool
        """
        assert isinstance(b, bool)

        changed = False

        if self.actionToggleMapViewHidden.isChecked() == b:
            self.actionToggleMapViewHidden.setChecked(not b)

        if changed:
            self.sigCanvasAppearanceChanged.emit()

    def isVisible(self)->bool:
        """
        Returns the map view visibility
        :return: bool
        """
        return not self.actionToggleMapViewHidden.isChecked()

    def mapCanvases(self)->list:
        """
        Returns the MapCanvases related to this map view. Requires that this mapview was added to a MapWidget
        :return: [list-of-MapCanvases]
        """

        if isinstance(self.mMapWidget, MapWidget):
            return self.mMapWidget.mapViewCanvases(self)
        else:
            return []

    def onTitleChanged(self, *args):

        self.setWindowTitle('Map View "{}"'.format(self.title()))
        self.sigTitleChanged.emit(self.title())
        if self.optionShowMapViewName.isChecked():
            self.sigCanvasAppearanceChanged.emit()

    def setMapWidget(self, w):
        if isinstance(w, MapWidget):
            self.mMapWidget = w
        else:
            self.mMapWidget = None

    def setTimeSeries(self, timeSeries:TimeSeries):
        """
        Conntects the MapView with a TimeSeries.
        :param timeSeries: TimeSeries
        """
        assert isinstance(timeSeries, TimeSeries)

        for s in self.sensors():
            self.removeSensor(s)

        self.mTimeSeries = timeSeries
        self.mTimeSeries.sigSensorAdded.connect(self.addSensor)
        self.mTimeSeries.sigSensorRemoved.connect(self.removeSensor)
        for s in timeSeries.sensors():
            self.addSensor(s)

    def timeSeries(self)->TimeSeries:
        """
        Returns the TimeSeries this mapview is connected with
        :return: TimeSeries
        """
        return self.mTimeSeries

    def setTitle(self, title:str):
        """
        Sets the widget title
        :param title: str
        """
        old = self.title()
        if old != title:
            self.tbName.setText(title)


    def layers(self)->list:
        """
        Returns the visible layers, including proxy layer for time-series data
        :return: [list-of-QgsMapLayers]
        """
        return [l for l in self.mLayerTree.checkedLayers() if isinstance(l, QgsMapLayer)]

    def title(self, maskNewLines=True)->str:
        """
        Returns the MapView title
        :return: str
        """
        if maskNewLines:
            return self.tbName.text().replace('\\n', ' ').strip()
        else:
            return self.tbName.text().strip()

    def setCrosshairStyle(self, crosshairStyle:CrosshairStyle)->CrosshairStyle:
        """
        Seths the CrosshairStyle of this MapView
        :param crosshairStyle: CrosshairStyle
        """

        if self.mCrossHairStyle != crosshairStyle:
            self.mCrossHairStyle = crosshairStyle
            self.sigCrosshairChanged.emit()

        return self.mCrossHairStyle


    def setHighlighted(self, b=True, timeout=1000):
        """
        Activates or deactivates a red-line border of the MapCanvases
        :param b: True | False to activate / deactivate the highlighted lines-
        :param timeout: int, milliseconds how long the highlighted frame should appear
        """
        styleOn = """.MapCanvas {
                    border: 4px solid red;
                    border-radius: 4px;
                }"""
        styleOff = """"""
        if b is True:
            for mapCanvas in self.mapCanvases():
                mapCanvas.setStyleSheet(styleOn)
            if timeout > 0:
                QTimer.singleShot(timeout, lambda : self.setHighlighted(False))
        else:
            for mapCanvas in self.mapCanvases():
                mapCanvas.setStyleSheet(styleOff)

    def crosshairStyle(self)->CrosshairStyle:
        """
        Returns the CrosshairStyle
        :return: CrosshairStyle
        """
        return self.mCrossHairStyle

    def setCrosshairVisibility(self, b:bool):
        """
        Enables / diables the map canvas crosshair.
        :param b: bool
        """
        if b != self.actionToggleCrosshairVisibility.isChecked():
            self.actionToggleCrosshairVisibility.setChecked(b)
        else:
            self.mCrossHairStyle.setVisibility(b)
            self.sigCrosshairChanged.emit()


    def sensorProxyLayers(self)->list:
        layers = [n.layer() for n in self.mLayerTreeSensorNode.findLayers()]
        return [l for l in layers if isinstance(l, SensorProxyLayer)]

    def sensorProxyLayer(self, sensor:SensorInstrument)->SensorProxyLayer:
        """
        Returns the proxy layer related to a SensorInstrument
        :param sensor: SensorInstrument
        :return: SensorLayer
        """
        for l in self.sensorProxyLayers():
            if l.sensor() == sensor:
                return l
        return None

    def sensors(self)->list:
        """
        Returns a list of SensorsInstruments
        :return: [list-of-SensorInstruments]
        """

        return [t[0] for t in self.mSensorLayerList]

    def addSensor(self, sensor:SensorInstrument):
        """
        Adds a SensorInstrument to be shown in this MapView. Each sensor will be represented as a Raster Layer in the
        Tree Model.
        :param sensor: SensorInstrument
        """
        assert isinstance(sensor, SensorInstrument)
        if sensor not in self.sensors():
            sensor.sigNameChanged.connect(self.sigCanvasAppearanceChanged)
            dummyLayer = sensor.proxyLayer()
            assert isinstance(dummyLayer.renderer(), QgsRasterRenderer)
            dummyLayer.rendererChanged.connect(lambda sensor=sensor: self.onSensorRendererChanged(sensor))

            #QgsProject.instance().addMapLayer(dummyLayer)

            layerTreeLayer = self.mLayerTreeSensorNode.addLayer(dummyLayer)
            assert isinstance(layerTreeLayer, QgsLayerTreeLayer)
            layerTreeLayer.setCustomProperty(KEY_LOCKED_LAYER, True)
            layerTreeLayer.setCustomProperty(KEY_SENSOR_LAYER, True)
            self.mSensorLayerList.append((sensor, dummyLayer))

    def onSensorRendererChanged(self, sensor:SensorInstrument):
        for c in self.sensorCanvases(sensor):
            assert isinstance(c, MapCanvas)
            c.addToRefreshPipeLine(MapCanvas.Command.RefreshRenderer)

    def sensorCanvases(self, sensor:SensorInstrument)->list:
        """
        Returns the MapCanvases that show a layer with data for the given ``sensor``
        :param sensor: SensorInstrument
        :return:
        """
        assert isinstance(sensor, SensorInstrument)
        return [c for c in self.mapCanvases() if isinstance(c, MapCanvas) and \
                isinstance(c.tsd(), TimeSeriesDate) and c.tsd().sensor() == sensor]


    def sensorLayer(self, sensor: SensorInstrument):
        """
        Returns the QgsRasterLayer that is used a proxy to specify the QgsRasterRenderer for a sensor
        :param sensor: SensorInstrument
        :return: QgsRasterLayer
        """
        assert isinstance(sensor, SensorInstrument)
        for t in self.mSensorLayerList:
            s, l = t
            assert isinstance(s, SensorInstrument)
            assert isinstance(l, QgsRasterLayer)
            if s == sensor:
                return l
        raise Exception('Sensor "{}" not registered to MapView "{}"'.format(sensor.name(), self.title()))

    def removeSensor(self, sensor:SensorInstrument):
        """
        Removes a sensor from this map view
        :param sensor:
        :return:
        """
        toRemove = []
        for t in self.mSensorLayerList:
            if t[0] == sensor:
                toRemove.append(t)

        for t in toRemove:
            self.mLayerTreeSensorNode.removeLayer(t[1])
            self.mSensorLayerList.remove(t)


    def hasSensor(self, sensor)->bool:
        """
        :param sensor:
        :return:
        """
        assert isinstance(sensor, SensorInstrument)
        return sensor in self.sensors()

class MapViewListModel(QAbstractListModel):
    """
    A model to store a list of map views.

    """
    sigMapViewsAdded = pyqtSignal(list)
    sigMapViewsRemoved = pyqtSignal(list)

    def __init__(self, parent=None):
        super(MapViewListModel, self).__init__(parent)
        self.mMapViewList = []

    def addMapView(self, mapView):
        i = len(self.mMapViewList)
        self.insertMapView(i, mapView)

    def insertMapView(self, i, mapView):
        self.insertMapViews(i, [mapView])

    def insertMapViews(self, i, mapViews):
        assert isinstance(mapViews, list)
        assert i >= 0 and i <= len(self.mMapViewList)

        self.beginInsertRows(QModelIndex(), i, i + len(mapViews) - 1)

        for j in range(len(mapViews)):
            mapView = mapViews[j]
            assert isinstance(mapView, MapView)
            mapView.sigTitleChanged.connect(
                lambda : self.doRefresh([mapView])
            )
            self.mMapViewList.insert(i + j, mapView)
        self.endInsertRows()
        self.sigMapViewsAdded.emit(mapViews)


    def doRefresh(self, mapViews):
        for mapView in mapViews:
            idx = self.mapView2idx(mapView)
            self.dataChanged.emit(idx, idx)

    def removeMapView(self, mapView):
        self.removeMapViews([mapView])

    def removeMapViews(self, mapViews):
        assert isinstance(mapViews, list)
        for mv in mapViews:
            assert mv in self.mMapViewList
            idx = self.mapView2idx(mv)
            self.beginRemoveRows(idx.parent(), idx.row(), idx.row())
            self.mMapViewList.remove(mv)
            self.endRemoveRows()
        self.sigMapViewsRemoved.emit(mapViews)

    def rowCount(self, parent=None, *args, **kwargs):
        return len(self.mMapViewList)

    def columnCount(self, QModelIndex_parent=None, *args, **kwargs):
        return 1


    def idx2MapView(self, index):
        if isinstance(index, QModelIndex):
            if index.isValid():
                index = index.row()
            else:
                return None
        assert index >= 0 and index < len(self.mMapViewList)
        return self.mMapViewList[index]


    def mapView2idx(self, mapView):
        assert isinstance(mapView, MapView)
        row = self.mMapViewList.index(mapView)
        return self.createIndex(row, 0, mapView)

    def __len__(self):
        return len(self.mMapViewList)

    def __iter__(self):
        return iter(self.mMapViewList)

    def __getitem__(self, slice):
        return self.mMapViewList[slice]

    def data(self, index, role=Qt.DisplayRole):
        if not index.isValid():
            return None

        if (index.row() >= len(self.mMapViewList)) or (index.row() < 0):
            return None

        mapView = self.idx2MapView(index)
        assert isinstance(mapView, MapView)

        value = None

        if role == Qt.DisplayRole:
            value = '{} {}'.format(index.row() +1 , mapView.title())
        #if role == Qt.DecorationRole:
            #value = classInfo.icon(QSize(20,20))
        if role == Qt.UserRole:
            value = mapView
        return value


class MapWidget(QFrame, loadUIFormClass(jp(DIR_UI, 'mapwidget.ui'))):
    """
    This widget contains all maps
    """

    class ViewMode(enum.Enum):

        MapViewByRows = 1,
        MapViewByCols = 2


    sigSpatialExtentChanged = pyqtSignal(SpatialExtent)
    sigCrosshairPositionChanged = pyqtSignal([SpatialPoint], [SpatialPoint, MapCanvas])
    sigCRSChanged = pyqtSignal(QgsCoordinateReferenceSystem)
    sigMapSizeChanged = pyqtSignal(QSize)

    sigMapBackgroundColorChanged = pyqtSignal(QColor)
    sigMapTextColorChanged = pyqtSignal(QColor)
    sigMapTextFormatChanged = pyqtSignal(QgsTextFormat)
    sigMapsPerMapViewChanged = pyqtSignal(int)
    sigMapViewsChanged = pyqtSignal()
    sigMapViewAdded = pyqtSignal(MapView)
    sigMapViewRemoved = pyqtSignal(MapView)
    sigCurrentDateChanged = pyqtSignal(TimeSeriesDate)
    sigCurrentLocationChanged = pyqtSignal(SpatialPoint, MapCanvas)
    sigVisibleDatesChanged = pyqtSignal(list)
    sigViewModeChanged = pyqtSignal(ViewMode)

    def __init__(self, *args, **kwds):
        super(MapWidget, self).__init__(*args, **kwds)
        self.setupUi(self)
        self.setContentsMargins(1, 1, 1, 1)
        self.mGrid = self.gridFrame.layout()
        assert isinstance(self.mGrid, QGridLayout)
        self.mGrid.setSpacing(0)
        self.mGrid.setContentsMargins(0, 0, 0, 0)

        self.mSyncLock = False

        self.mMaxNumberOfCachedLayers = 0

        self.mMapLayerStore = QgsMapLayerStore()
        self.mMapLayerCache = dict()
        self.mCanvasCache = dict()

        self.mMapViews = []
        self.mCanvases = dict()
        self.mCanvasSignals = dict()
        self.mTimeSeries = None

        self.mMapToolKey = MapTools.Pan

        self.mViewMode = MapWidget.ViewMode.MapViewByRows
        self.mMpMV = 3

        self.mSpatialExtent = SpatialExtent.world()
        self.mCrs = self.mSpatialExtent.crs()
        self.mCurrentDate = None
        self.mCrosshairPosition = None

        self.mMapSize = QSize(200, 200)
        from eotimeseriesviewer.settings import DEFAULT_VALUES, Keys
        self.mMapTextFormat = DEFAULT_VALUES[Keys.MapTextFormat]
        self.mMapRefreshTimer = QTimer(self)
        self.mMapRefreshTimer.timeout.connect(self.timedRefresh)
        self.mMapRefreshTimer.setInterval(500)
        self.mMapRefreshTimer.start()

        self.btnFirst.setDefaultAction(self.actionFirstDate)
        self.btnLast.setDefaultAction(self.actionLastDate)
        self.btnBackward.setDefaultAction(self.actionBackward)
        self.btnForward.setDefaultAction(self.actionForward)
        self.btnBackwardFast.setDefaultAction(self.actionBackwardFast)
        self.btnForwardFast.setDefaultAction(self.actionForwardFast)

        self.actionFirstDate.triggered.connect(self.moveToFirstTSD)
        self.actionLastDate.triggered.connect(self.moveToLastTSD)
        self.actionBackward.triggered.connect(self.moveToPreviousTSD)
        self.actionForward.triggered.connect(self.moveToNextTSD)
        self.actionBackwardFast.triggered.connect(self.moveToPreviousTSDFast)
        self.actionForwardFast.triggered.connect(self.moveToNextTSDFast)

        self.mTimeSlider.setTickInterval(0)
        self.mTimeSlider.valueChanged.connect(self.onSliderReleased)



    def messageBar(self)->QgsMessageBar:
        """
        Returns the QgsMessageBar
        :return: QgsMessageBar
        """
        return self.mMessageBar

    def refresh(self):
        for c in self.mapCanvases():
            assert isinstance(c, MapCanvas)
            c.timedRefresh()

    def setMapTextFormat(self, textFormat:QgsTextFormat)->QgsTextFormat:

        if not equalTextFormats(textFormat, self.mMapTextFormat):
            self.mMapTextFormat = textFormat
            for mapView in self.mapViews():
                assert isinstance(mapView, MapView)
                mapView.setMapTextFormat(textFormat)
            self.sigMapTextFormatChanged.emit(self.mapTextFormat())
        return self.mapTextFormat()

    def mapTextFormat(self)->QgsTextFormat:
        return self.mMapTextFormat



    def setMapTool(self, mapToolKey:MapTools):

        if self.mMapToolKey != mapToolKey:
            self.mMapToolKey = mapToolKey

            for c in self.mapCanvases():
                assert isinstance(c, MapCanvas)
                mts = c.mapTools()
                mts.activate(self.mMapToolKey)

    def visibleTSDs(self)->list:
        """
        Returns the list of currently shown TimeSeriesDates.
        :return: [list-of-TimeSeriesDates]
        """

        for mv in self.mMapViews:
            tsds = []
            for c in self.mCanvases[mv]:
                if isinstance(c.tsd(), TimeSeriesDate):
                    tsds.append(c.tsd())

            return sorted(tsds)
        return []

    def spatialExtent(self)->SpatialExtent:
        """
        Returns the current SpatialExtent
        :return: SpatialExtent
        """
        return self.mSpatialExtent

    def setSpatialExtent(self, extent:SpatialExtent)->SpatialExtent:
        """
        Sets a SpatialExtent to all MapCanvases.
        :param extent: SpatialExtent
        :return: SpatialExtent the current SpatialExtent
        """
        assert isinstance(extent, SpatialExtent)
        if self.mSpatialExtent != extent:
            self.mSpatialExtent = extent

            for c in self.mapCanvases():
                assert isinstance(c, MapCanvas)
                c.addToRefreshPipeLine(extent)

            self.sigSpatialExtentChanged.emit(self.mSpatialExtent.__copy__())
        return self.spatialExtent()

    def setSpatialCenter(self, centerNew:SpatialPoint):
        """
        Sets the spatial center of all MapCanvases
        :param centerNew: SpatialPoint
        """
        assert isinstance(centerNew, SpatialPoint)
        extent = self.spatialExtent()
        if isinstance(extent, SpatialExtent):
            centerOld = extent.center()
            centerNew = centerNew.toCrs(extent.crs())
            if centerNew != centerOld and isinstance(centerNew, SpatialPoint):
                extent = extent.__copy__()
                extent.setCenter(centerNew)
                self.setSpatialExtent(extent)


    def spatialCenter(self)->SpatialPoint:
        """
        Return the center of all map canvas
        :return: SpatialPoint
        """
        return self.spatialExtent().spatialCenter()


    def setCrs(self, crs:QgsCoordinateReferenceSystem)->QgsCoordinateReferenceSystem:
        """
        Sets the MapCanvas CRS.
        :param crs: QgsCoordinateReferenceSystem
        :return: QgsCoordinateReferenceSystem
        """

        self.mCrs = crs
        if isinstance(crs, QgsCoordinateReferenceSystem):
            for c in self.mapCanvases():
                c.setCrs(crs)

        return self.crs()

    def timedRefresh(self):
        """
        Calls the timedRefresh() routine for all MapCanvases
        """
        for c in self.mapCanvases():
            assert isinstance(c, MapCanvas)
            c.timedRefresh()


    def currentLayers(self):

        layers = set()
        for c in self.mapCanvases():
            layers = layers.union(set(c.layers()))
        return list(layers)


    def crs(self)->QgsCoordinateReferenceSystem:
        return self.mCrs

    def setTimeSeries(self, ts:TimeSeries)->TimeSeries:
        assert ts == None or isinstance(ts, TimeSeries)
        self.mTimeSeries = ts
        if isinstance(self.mTimeSeries, TimeSeries):
            self.mTimeSeries.sigVisibilityChanged.connect(self._updateCanvasDates)
            self.mTimeSeries.sigTimeSeriesDatesRemoved.connect(self._updateCanvasDates)

            self.mTimeSeries.sigTimeSeriesDatesAdded.connect(self._updateSliderRange)
            self.mTimeSeries.sigTimeSeriesDatesRemoved.connect(self._updateSliderRange)

            if len(self.mTimeSeries) > 0:
                self.mCurrentDate = self.mTimeSeries[0]
            else:
                self.mTimeSeries.sigTimeSeriesDatesAdded.connect(self.onSetInitialCurrentDate)
            self._updateSliderRange()

        return self.timeSeries()


    def onSetInitialCurrentDate(self):
        if len(self.timeSeries()) > 0:
            self.setCurrentDate(self.timeSeries()[0])
            self.mTimeSeries.sigTimeSeriesDatesAdded.disconnect(self.onSetInitialCurrentDate)

    def _updateSliderRange(self):

        slider = self.timeSlider()
        assert isinstance(slider, QSlider)
        n = len(self.timeSeries())
        slider.setRange(0, n)
        slider.setEnabled(n > 0)

        if n > 10:
            pageStep = int(n/100)*10
            slider.setTickInterval(pageStep)
        else:
            pageStep = 5
            slider.setTickInterval(0)

        slider.setPageStep(pageStep)

        if n > 0:
            tsd = self.currentDate()
            if isinstance(tsd, TimeSeriesDate) and tsd in self.timeSeries():
                i = self.timeSeries()[:].index(tsd)
                slider.setValue(i+1)

    def onSliderReleased(self):

        i = self.mTimeSlider.value() - 1
        if isinstance(self.mTimeSeries, TimeSeries) and len(self.mTimeSeries) > 0:
            i = min(i, len(self.mTimeSeries)-1)
            i = max(i,  0)
            tsd = self.mTimeSeries[i]
            self.setCurrentDate(tsd)


    def timeSeries(self)->TimeSeries:
        return self.mTimeSeries

    def setMode(self, mode:ViewMode):

        if mode != self.mViewMode:
            self.mViewMode = mode
            self._updateGrid()
            self.sigViewModeChanged.emit(self.mViewMode)

    def setMapsPerMapView(self, n:int)->int:
        """
        Sets the number of maps per map viewe
        :param n: int
        :return: int, number of maps per map view
        """
        assert n >= 0

        if n != self.mMpMV:
            self.mMpMV = n
            self._updateGrid()
            self.timeSlider().setPageStep(max(1, n))
            self.sigMapsPerMapViewChanged.emit(n)
        return self.mapsPerMapView()


    def mapsPerMapView(self)->int:
        """
        Returns the number of maps per map view
        :return: int
        """
        return self.mMpMV

    def setMapSize(self, size:QSize)->QSize:
        """
        Sets the MapCanvas size
        :param size: QSite
        :return: QSize
        """

        if size != self.mMapSize:
            for canvas in self.mapCanvases():
                canvas.setFixedSize(size)

            self.mMapSize = size
            self._updateWidgetSize()
            self.sigMapSizeChanged.emit(size)

        return self.mMapSize

    def mapSize(self)->QSize:
        """
        Returns the MapCanvas size
        :return: QSize
        """
        return self.mMapSize

    def mapCanvases(self)->list:
        """
        Returns all MapCanvases
        :return: [list-of-MapCanvases]
        """
        return self.findChildren(MapCanvas)

    def mapViewCanvases(self, mapView:MapView)->list:
        """
        Returns the MapCanvases related to a MapView
        :param mapView: MapView
        :return: [list-of-MapCanvases]
        """
        return self.mCanvases[mapView]


    def moveToNextTSD(self):

        for tsd in self.timeSeries()[:]:
            assert isinstance(tsd, TimeSeriesDate)
            if tsd > self.currentDate() and tsd.isVisible():
                self.setCurrentDate(tsd)
                return
        s = ""

    def moveToPreviousTSD(self):
        for tsd in reversed(self.timeSeries()[:]):
            if tsd < self.currentDate() and tsd.isVisible():
                self.setCurrentDate(tsd)
                return
        s = ""

    def moveToNextTSDFast(self):
        visible = list([tsd for tsd in self.timeSeries() if tsd.isVisible() and tsd > self.currentDate()])
        if len(visible) > 0 and self.mMpMV > 0:
            i = min(self.mMpMV-1, len(visible)-1)
            self.setCurrentDate(visible[i])


    def moveToPreviousTSDFast(self):
        visible = list(reversed([tsd for tsd in self.timeSeries() if tsd.isVisible() and tsd < self.currentDate()]))
        if len(visible) > 0 and self.mMpMV > 0:
            i = min(self.mMpMV - 1, len(visible)-1)
            self.setCurrentDate(visible[i])

    def moveToFirstTSD(self):
        for tsd in self.timeSeries()[:]:
            if tsd.isVisible():
                self.setCurrentDate(tsd)
                return
        s = ""


    def moveToLastTSD(self):
        for tsd in reversed(self.timeSeries()[:]):
            if tsd.isVisible():
                self.setCurrentDate(tsd)
                return
        s  = ""

    def setCurrentDate(self, tsd:TimeSeriesDate)->TimeSeriesDate:
        """
        Sets the current TimeSeriesDate, i.e. the "center" date of all dates to be shown
        :param tsd: TimeSeriesDate
        :return: TimeSeriesDate
        """
        assert isinstance(tsd, TimeSeriesDate)

        b = tsd != self.mCurrentDate or (len(self.mapCanvases()) > 0 and self.mapCanvases()[0].tsd() is None)
        self.mCurrentDate = tsd

        if b:
            self._updateCanvasDates()

            i = self.mTimeSeries[:].index(self.mCurrentDate) + 1

            if self.mTimeSlider.value() != i:
                self.mTimeSlider.setValue(i)
            self.sigCurrentDateChanged.emit(self.mCurrentDate)


        if isinstance(self.currentDate(), TimeSeriesDate):
            i = self.timeSeries()[:].index(self.currentDate())
            canForward = i < len(self.mTimeSeries) - 1
            canBackward = i > 0
        else:
            canForward = canBackward = False

        for a in [self.actionForward, self.actionForwardFast, self.actionLastDate]:
            a.setEnabled(canForward)

        for a in [self.actionBackward, self.actionBackwardFast, self.actionFirstDate]:
            a.setEnabled(canBackward)

        return self.mCurrentDate

    def timeSlider(self)->QSlider:
        return self.mTimeSlider

    def currentDate(self)->TimeSeriesDate:
        """
        Returns the current TimeSeriesDate
        :return: TimeSeriesDate
        """
        return self.mCurrentDate

    def addMapView(self, mapView:MapView)->MapView:
        """
        Adds a MapView
        :param mapView: MapView
        :return: MapView
        """
        assert isinstance(mapView, MapView)
        if mapView not in self.mMapViews:

            self.mMapViews.append(mapView)

            mapView.setMapWidget(self)

            # connect signals
            mapView.sigCanvasAppearanceChanged.connect(self._updateCanvasAppearance)
            mapView.sigCrosshairChanged.connect(self._updateCrosshair)

            self._updateGrid()
            self._updateCrosshair(mapView=mapView)
            self.sigMapViewsChanged.emit()
            self.sigMapViewAdded.emit(mapView)

        return mapView

    def removeMapView(self, mapView:MapView)->MapView:
        """
        Removes a MapView
        :param mapView: Mapview
        :return: MapView
        """
        if mapView in self.mMapViews:
            self.mMapViews.remove(mapView)
            mapView.setMapWidget(None)
            # disconnect signals


            self._updateGrid()
            self.sigMapViewsChanged.emit()
            self.sigMapViewRemoved.emit(mapView)
        return mapView

    def mapViews(self)->list:
        """
        Returns a list of all MapViews
        :return: [list-of-MapViews]
        """
        return self.mMapViews[:]

    def syncQGISCanvasCenter(self, qgisChanged:bool):

        if self.mSyncLock:
            return

        iface = qgis.utils.iface
        assert isinstance(iface, QgisInterface)

        c = iface.mapCanvas()
        if not isinstance(c, QgsMapCanvas):
            return

        tsvCenter = self.spatialExtent().spatialCenter()
        qgsCenter = SpatialExtent.fromMapCanvas(c).spatialCenter()

        if qgisChanged:
            # change EOTSV
            if tsvCenter.crs().isValid():
                self.mSyncLock = True
                qgsCenter = qgsCenter.toCrs(tsvCenter.crs())
                if isinstance(qgsCenter, SpatialPoint):
                    self.setSpatialCenter(qgsCenter)
                QApplication.processEvents()
                self.mSyncLock = False


        else:
            # change QGIS
            if qgsCenter.crs().isValid():
                self.mSyncLock = True
                tsvCenter = tsvCenter.toCrs(qgsCenter.crs())
                if isinstance(tsvCenter, SpatialPoint):
                    c.setCenter(tsvCenter)
                QApplication.processEvents()
                self.mSyncLock = False

    def _createMapCanvas(self)->MapCanvas:
        mapCanvas = MapCanvas()
        mapCanvas.setMapLayerStore(self.mMapLayerStore)
        mapCanvas.mInfoItem.setTextFormat(self.mapTextFormat())

        # set general canvas properties
        mapCanvas.setFixedSize(self.mMapSize)
        mapCanvas.setDestinationCrs(self.mCrs)
        mapCanvas.setSpatialExtent(self.mSpatialExtent)

        # activate the current map tool
        mapTools = mapCanvas.mapTools()
        mapTools.activate(self.mMapToolKey)

        # connect signals
        self._connectCanvasSignals(mapCanvas)
        return mapCanvas

    def _connectCanvasSignals(self, mapCanvas:MapCanvas):
        mapCanvas.sigSpatialExtentChanged.connect(self.setSpatialExtent)
        mapCanvas.sigDestinationCrsChanged.connect(self.setCrs)
        mapCanvas.sigCrosshairPositionChanged.connect(self.onCrosshairPositionChanged)
        mapCanvas.mapTools().mtCursorLocation.sigLocationRequest[SpatialPoint, QgsMapCanvas].connect(self.sigCurrentLocationChanged)

    def _disconnectCanvasSignals(self, mapCanvas:MapCanvas):
        mapCanvas.sigSpatialExtentChanged.disconnect(self.setSpatialExtent)
        mapCanvas.sigDestinationCrsChanged.disconnect(self.setCrs)
        mapCanvas.sigCrosshairPositionChanged.disconnect(self.onCrosshairPositionChanged)
        mapCanvas.mapTools().mtCursorLocation.sigLocationRequest[SpatialPoint, QgsMapCanvas].disconnect(
            self.sigCurrentLocationChanged)


    def onCrosshairPositionChanged(self, spatialPoint:SpatialPoint):
        canvas = self.sender()

        if self.mCrosshairPosition != spatialPoint:
            self.setCrosshairPosition(spatialPoint)
            self.sigCrosshairPositionChanged[SpatialPoint, MapCanvas].emit(self.mCrosshairPosition, canvas)

    def setCurrentLayer(self, layer:QgsMapLayer):

        for mapView in self.mapViews():
            mapView.setCurrentLayer(layer)

    def setCrosshairPosition(self, spatialPoint)->SpatialPoint:
        spatialPoint = spatialPoint.toCrs(self.crs())
        if self.mCrosshairPosition != spatialPoint:
            self.mCrosshairPosition = spatialPoint

            for canvas in self.mapCanvases():
                assert isinstance(canvas, MapCanvas)
                canvas.setCrosshairPosition(spatialPoint)

            self.sigCrosshairPositionChanged[SpatialPoint].emit(self.mCrosshairPosition)
        return self.crosshairPosition()

    def crosshairPosition(self)->SpatialPoint:
        return self.mCrosshairPosition

    def _updateGrid(self):
        import time
        t0 = time.time()

        oldCanvases = self._updateLayerCache()


        # crop grid
        if self.mViewMode == MapWidget.ViewMode.MapViewByRows:

            nc = self.mMpMV
            nr = len(self.mapViews())
        else:
            raise NotImplementedError()

        toRemove = []
        for row in range(nr, self.mGrid.rowCount()):
            for col in range(self.mGrid.columnCount()):
                item = self.mGrid.itemAtPosition(row, col)
                if isinstance(item, QLayoutItem) and isinstance(item.widget(), QWidget):
                    toRemove.append(item.widget())

        for col in range(nc, self.mGrid.columnCount()):
            for row in range(self.mGrid.rowCount()):
                item = self.mGrid.itemAtPosition(row, col)
                if isinstance(item, QLayoutItem) and isinstance(item.widget(), QWidget):
                    toRemove.append(item.widget())

        for w in toRemove:
            self.mGrid.removeWidget(w)
            w.setParent(None)
            w.setVisible(False)

        usedCanvases = []
        self.mCanvases.clear()

        if self.mViewMode == MapWidget.ViewMode.MapViewByRows:
            for row, mv in enumerate(self.mMapViews):
                assert isinstance(mv, MapView)
                self.mCanvases[mv] = []
                for col in range(self.mMpMV):
                    item = self.mGrid.itemAtPosition(row, col)
                    if isinstance(item, QLayoutItem) and isinstance(item.widget(), MapCanvas):
                        c = item.widget()
                    else:
                        c = self._createMapCanvas()
                        self.mGrid.addWidget(c, row, col)
                    assert isinstance(c, MapCanvas)
                    #c.setFixedSize(self.mMapSize)
                    c.setTSD(None)
                    c.setMapView(mv)
                    usedCanvases.append(c)
                    self.mCanvases[mv].append(c)
        else:
            raise NotImplementedError()
        t1 = time.time()
        self._updateCanvasDates()
        t2 = time.time()
        self._updateWidgetSize()
        t3 = time.time()

        s = ""
        # remove old canvases
        for c in oldCanvases:
            if c not in usedCanvases:
                try:
                    self._disconnectCanvasSignals(c)
                except:
                    pass

        t4 = time.time()

        if False:
            print('t1: {}'.format(t1 - t0))
            print('t2: {}'.format(t2 - t1))
            print('t3: {}'.format(t3 - t2))
            print('t4: {}'.format(t4 - t3))



    def _updateWidgetSize(self):

        self.mGrid.update()
        #self.resize(self.sizeHint())
        # self.setMaximumSize(self.sizeHint())
        # self.setFixedSize(self.sizeHint())
        #if False and self.parentWidget():
        if True:
            w = self
            assert isinstance(w, QWidget)

            rect = QGuiApplication.primaryScreen().geometry()

            maxw, maxh = 0.66*rect.width(), 0.66*rect.height()
            hint = self.sizeHint()
            minw, minh = min(hint.width(), maxw), min(hint.height(), maxh)

            w.setMinimumSize(minw, minh)
            #w.setFixedSize(self.sizeHint())
            w.layout().update()
            w.update()

    def _updateLayerCache(self)->list:
        canvases = self.findChildren(MapCanvas)
        for c in canvases:
            assert isinstance(c, MapCanvas)
            self.mMapLayerCache[self._layerListKey(c)] = c.layers()
        return canvases

    def _layerListKey(self, canvas:MapCanvas):
        return (canvas.mapView(), canvas.tsd())

    def _updateCanvasDates(self, updateLayerCache=True):

        visibleBefore = self.visibleTSDs()
        bTSDChanged = False

        if updateLayerCache:
            self._updateLayerCache()

        if not (isinstance(self.mCurrentDate, TimeSeriesDate) and isinstance(self.timeSeries(), TimeSeries)):
            for c in self.findChildren(MapCanvas):
                assert isinstance(c, MapCanvas)
                c.setTSD(None)
            bTSDChanged = True
        else:

            visible = [tsd for tsd in self.timeSeries() if tsd.isVisible()]

            t = self.mCurrentDate.date()
            visible = sorted(visible, key=lambda tsd: abs(tsd.date() - t))
            visible = visible[0:min(len(visible), self.mMpMV)]
            visible = sorted(visible)

            # set TSD of remaining canvases to None
            while len(visible) < self.mMpMV:
                visible.append(None)

            for mapView in self.mapViews():
                for tsd, canvas in zip(visible, self.mCanvases[mapView]):
                    assert isinstance(tsd, TimeSeriesDate) or tsd is None
                    assert isinstance(canvas, MapCanvas)
                    if canvas.tsd() != tsd:
                        canvas.setTSD(tsd)

                        key = self._layerListKey(canvas)
                        if key in self.mMapLayerCache.keys():
                            canvas.setLayers(self.mMapLayerCache.pop(key))
                        bTSDChanged = True

                    # canvas.setLayers()
        if bTSDChanged:
            self._updateCanvasAppearance()

        visible2 = self.visibleTSDs()
        if visible2 != visibleBefore:
            self.sigVisibleDatesChanged.emit(visible2)

        self._freeUnusedMapLayers()

    def _freeUnusedMapLayers(self):

        layers = [l for l in self.mMapLayerStore.mapLayers().values() if isinstance(l, SensorProxyLayer)]
        needed = self.currentLayers()
        toRemove = [l for l in layers if isinstance(l, SensorProxyLayer) and l not in needed]

        # todo: use a kind of caching

        # remove layers from MapLayerCache and MapLayerStore
        for mv in self.mMapLayerCache.keys():
            layers = [l for l in self.mMapLayerCache[mv] if l not in toRemove]
            self.mMapLayerCache[mv] = layers
        self.mMapLayerStore.removeMapLayers(toRemove)




    def _updateCrosshair(self, mapView=None):

        if isinstance(mapView, MapView):
            mapViews = [mapView]
        else:
            mapViews = self.mapViews()

        for mapView in mapViews:
            assert isinstance(mapView, MapView)
            style = mapView.crosshairStyle()
            assert isinstance(style, CrosshairStyle)

            for canvas in self.mCanvases[mapView]:
                assert isinstance(canvas, MapCanvas)

                item = canvas.mCrosshairItem
                item.setVisibility(style.mShow)
                assert isinstance(item, CrosshairMapCanvasItem)
                item.setCrosshairStyle(style)
                canvas.addToRefreshPipeLine(MapCanvas.Command.UpdateMapItems)

    def _updateCanvasAppearance(self, mapView=None):

        if isinstance(mapView, MapView):
            mapViews = [mapView]
        else:
            mapViews = self.mapViews()

        for mapView in mapViews:
            assert isinstance(mapView, MapView)
            v = mapView.isVisible()
            bg = mapView.mapBackgroundColor()
            tf = mapView.mapTextFormat()

            showDate = mapView.optionShowDate.isChecked()
            showName = mapView.optionShowMapViewName.isChecked()
            showSensor = mapView.optionShowSensorName.isChecked()

            for canvas in self.mCanvases[mapView]:
                assert isinstance(canvas, MapCanvas)

                # set overall visibility
                if canvas.isVisible() != v:
                    canvas.setVisible(v)

                tsd = canvas.tsd()

                if canvas.canvasColor() != bg:
                    canvas.addToRefreshPipeLine(mapView.mapBackgroundColor())

                # set info text
                info = canvas.infoItem()
                assert isinstance(info, MapCanvasInfoItem)
                info.setTextFormat(tf)

                uc = []
                lc = []
                if isinstance(tsd, TimeSeriesDate):
                    if showDate:
                        uc += ['{}'.format(tsd.date())]
                    if showName:
                        lc += ['{}'.format(mapView.title(maskNewLines=False))]
                    if showSensor:
                        uc += ['{}'.format(tsd.sensor().name())]

                uc = '\n'.join(uc)
                lc = '\n'.join(lc)

                info.setUpperCenter(uc)
                info.setLowerCenter(lc)

                canvas.addToRefreshPipeLine(MapCanvas.Command.UpdateMapItems)




class MapViewDock(QgsDockWidget, loadUI('mapviewdock.ui')):

    sigMapViewAdded = pyqtSignal(MapView)
    sigMapViewRemoved = pyqtSignal(MapView)
    sigShowProfiles = pyqtSignal(SpatialPoint, MapCanvas, str)

    sigMapCanvasColorChanged = pyqtSignal(QColor)
    sigMapCanvasTextFormatChanged = pyqtSignal(QgsTextFormat)
    sigSpatialExtentChanged = pyqtSignal(SpatialExtent)
    sigCrsChanged = pyqtSignal(QgsCoordinateReferenceSystem)
    sigMapSizeChanged = pyqtSignal(QSize)
    sigMapsPerMapViewChanged = pyqtSignal(int)
    sigMapTextFormatChanged = pyqtSignal(QgsTextFormat)

    def setTimeSeries(self, timeSeries:TimeSeries):
        assert isinstance(timeSeries, TimeSeries)
        self.mTimeSeries = timeSeries
        self.mTimeSeries.sigSensorAdded.connect(self.addSensor)
        self.mTimeSeries.sigSensorRemoved.connect(self.removeSensor)

    def __init__(self, parent=None):
        super(MapViewDock, self).__init__(parent)
        self.setupUi(self)

        self.baseTitle = self.windowTitle()

        self.btnAddMapView.setDefaultAction(self.actionAddMapView)
        self.btnRemoveMapView.setDefaultAction(self.actionRemoveMapView)

        self.btnCrs.setOptionVisible(QgsProjectionSelectionWidget.LayerCrs, True)
        self.btnCrs.setOptionVisible(QgsProjectionSelectionWidget.ProjectCrs, True)
        self.btnCrs.setOptionVisible(QgsProjectionSelectionWidget.CurrentCrs, True)
        self.btnCrs.setOptionVisible(QgsProjectionSelectionWidget.DefaultCrs, True)
        self.btnCrs.setOptionVisible(QgsProjectionSelectionWidget.RecentCrs, True)
        #self.btnCrs.setOptionVisible(QgsProjectionSelectionWidget.CrsNotSet, True)

        self.btnCrs.crsChanged.connect(self.sigCrsChanged)
        self.btnMapCanvasColor.colorChanged.connect(self.sigMapCanvasColorChanged)
        self.btnTextFormat.changed.connect(lambda *args: self.sigMapTextFormatChanged.emit(self.mapTextFormat()))
        self.btnApplySizeChanges.clicked.connect(self.onApplyButtonClicked)

        self.actionAddMapView.triggered.connect(self.createMapView)
        self.actionRemoveMapView.triggered.connect(lambda: self.removeMapView(self.currentMapView()) if self.currentMapView() else None)

        self.toolBox.currentChanged.connect(self.onToolboxIndexChanged)

        self.spinBoxMapSizeX.valueChanged.connect(lambda: self.onMapSizeChanged('X'))
        self.spinBoxMapSizeY.valueChanged.connect(lambda: self.onMapSizeChanged('Y'))
        self.mLastMapSize = self.mapSize()
        self.mLastNDatesPerMapView = self.sbMpMV.value()

        self.mTimeSeries = None
        self.mMapWidget = None

    def onApplyButtonClicked(self):
        self.sigMapSizeChanged.emit(QSize(self.spinBoxMapSizeX.value(), self.spinBoxMapSizeY.value()))
        self.sigMapsPerMapViewChanged.emit(self.mapsPerMapView())

    def setMapWidget(self, mw)->MapWidget:
        """
        Connects this MapViewDock with a MapWidget
        :param mw: MapWidget
        :return:
        """
        assert isinstance(mw, MapWidget)

        assert mw.timeSeries() == self.mTimeSeries, 'Set the time series first!'
        self.mMapWidget = mw

        self.sigCrsChanged.connect(mw.setCrs)
        mw.sigCRSChanged.connect(self.setCrs)

        self.sigMapSizeChanged.connect(mw.setMapSize)
        mw.sigMapSizeChanged.connect(self.setMapSize)

        self.sigMapTextFormatChanged.connect(mw.setMapTextFormat)
        mw.sigMapTextFormatChanged.connect(self.setMapTextFormat)

        self.sigMapsPerMapViewChanged.connect(mw.setMapsPerMapView)
        mw.sigMapsPerMapViewChanged.connect(self.setMapsPerMapView)

        self.sigMapViewAdded.connect(mw.addMapView)
        self.sigMapViewRemoved.connect(mw.removeMapView)
        mw.sigMapViewAdded.connect(self.addMapView)
        mw.sigMapViewRemoved.connect(self.removeMapView)

        for mapView in mw.mapViews():
            self.addMapView(mapView)

        return self.mMapWidget

    def mapWidget(self)->MapWidget:
        """
        Returns the connected MapWidget
        :return: MapWidget
        """
        return self.mMapWidget

    def mapViews(self)->list:
        """
        Returns the defined MapViews
        :return: [list-of-MapViews]
        """
        assert isinstance(self.toolBox, QToolBox)
        mapViews = []
        for i in range(self.toolBox.count()):
            item = self.toolBox.widget(i)
            if isinstance(item, MapView):
                mapViews.append(item)
        return mapViews

    def mapCanvases(self)->list:
        """
        Returns all MapCanvases from all MapViews
        :return: [list-of-MapCanvases]
        """

        maps = []
        for mapView in self.mapViews():
            assert isinstance(mapView, MapView)
            maps.extend(mapView.mapCanvases())
        return maps

    def setCrs(self, crs):
        if isinstance(crs, QgsCoordinateReferenceSystem):
            old = self.btnCrs.crs()
            if old != crs:
                self.btnCrs.setCrs(crs)
                self.btnCrs.setLayerCrs(crs)

    def mapsPerMapView(self)->int:
        return self.sbMpMV.value()

    def setMapsPerMapView(self, n:int):
        assert n >= 0

        if self.sbMpMV.value != n:
            self.sbMpMV.setValue(n)
            self.mLastNDatesPerMapView = n

    def setMapTextFormat(self, textFormat:QgsTextFormat):

        if not equalTextFormats(textFormat, self.mapTextFormat()):
            self.btnTextFormat.setTextFormat(textFormat)

    def mapTextFormat(self)->QgsTextFormat:
        return self.btnTextFormat.textFormat()

    def setMapSize(self, size):
        assert isinstance(size, QSize)
        ws = [self.spinBoxMapSizeX, self.spinBoxMapSizeY]
        oldSize = self.mapSize()
        b = oldSize != size
        for w in ws:
            w.blockSignals(True)

        self.spinBoxMapSizeX.setValue(size.width()),
        self.spinBoxMapSizeY.setValue(size.height())
        self.mLastMapSize = QSize(size)
        for w in ws:
            w.blockSignals(False)
        self.mLastMapSize = QSize(size)
        if b:
            self.sigMapSizeChanged.emit(size)

    def onMapSizeChanged(self, dim):
        newSize = self.mapSize()
        #1. set size of other dimension accordingly
        if dim is not None:
            if self.checkBoxKeepSubsetAspectRatio.isChecked():
                if dim == 'X':
                    vOld = self.mLastMapSize.width()
                    vNew = newSize.width()
                    targetSpinBox = self.spinBoxMapSizeY
                elif dim == 'Y':
                    vOld = self.mLastMapSize.height()
                    vNew = newSize.height()
                    targetSpinBox = self.spinBoxMapSizeX

                oldState = targetSpinBox.blockSignals(True)
                targetSpinBox.setValue(int(round(float(vNew) / vOld * targetSpinBox.value())))
                targetSpinBox.blockSignals(oldState)
                newSize = self.mapSize()
            if newSize != self.mLastMapSize:
                self.btnApplySizeChanges.setEnabled(True)
        else:
            self.sigMapSizeChanged.emit(self.mapSize())
            self.btnApplySizeChanges.setEnabled(False)
        self.setMapSize(newSize)

    def mapSize(self)->QSize:
        return QSize(self.spinBoxMapSizeX.value(),
                     self.spinBoxMapSizeY.value())


    def dummySlot(self):
        s  =""

    def onMapViewsRemoved(self, mapViews):

        for mapView in mapViews:
            idx = self.stackedWidget.indexOf(mapView.ui)
            if idx >= 0:
                self.stackedWidget.removeWidget(mapView.ui)
                mapView.ui.close()
            else:
                s = ""


        self.actionRemoveMapView.setEnabled(len(self.mMapViews) > 0)


    def mapBackgroundColor(self)->QColor:
        """
        Returns the map canvas background color
        :return: QColor
        """
        return self.btnMapCanvasColor.color()


    def setMapBackgroundColor(self, color:QColor):
        """
        Sets the MapCanvas background color
        :param color: QColor
        """
        if color != self.mapBackgroundColor():
            self.btnMapCanvasColor.setColor(color)

    def setMapTextColor(self, color:QColor):
        """
        Sets the map text color
        :param color: QColor
        :return: QColor
        """
        if color != self.mapTextColor():
            self.btnMapTextColor.setColor(color)
        return self.mapTextColor()

    def mapTextColor(self)->QColor:
        """
        Returns the map text color.
        :return: QColor
        """
        return self.btnMapTextColor.color()


    def onMapViewsAdded(self, mapViews):
        nextShown = None
        for mapView in mapViews:
            mapView.sigTitleChanged.connect(self.updateTitle)
            self.stackedWidget.addWidget(mapView.ui)
            if nextShown is None:
                nextShown = mapView

            contents = mapView.ui.scrollAreaWidgetContents
            size = contents.size()
            hint = contents.sizeHint()
            #mapView.ui.scrollArea.update()
            s = ""
            #setMinimumSize(mapView.ui.scrollAreaWidgetContents.sizeHint())
            #hint = contents.sizeHint()
            #contents.setMinimumSize(hint)
        if isinstance(nextShown, MapView):
            self.setCurrentMapView(nextShown)

        for mapView in mapViews:
            self.sigMapViewAdded.emit(mapView)

    def updateButtons(self, *args):
        b = len(self.mMapViews) > 0
        self.actionRemoveMapView.setEnabled(b)
        self.actionApplyStyles.setEnabled(b)
        self.actionHighlightMapView.setEnabled(b)


    def createMapView(self, name:str=None)->MapView:
        """
        Create a new MapView
        :return: MapView
        """

        mapView = MapView()

        n = len(self.mapViews()) + 1
        if isinstance(name, str) and len(name) > 0:
            title = name
        else:
            title = 'Map View {}'.format(n)
            while title in [m.title() for m in self.mapViews()]:
                n += 1
                title = 'Map View {}'.format(n)

        if n == 1:
            mapView.optionShowDate.setChecked(True)
            mapView.optionShowSensorName.setChecked(True)

        mapView.setTitle(title)
        mapView.sigShowProfiles.connect(self.sigShowProfiles)
        mapView.setTimeSeries(self.mTimeSeries)
        self.addMapView(mapView)
        return mapView


    def onInfoOptionToggled(self):

        self.sigMapInfoChanged.emit()
        s = ""

    def addMapView(self, mapView:MapView):
        """
        Adds a MapView
        :param mapView: MapView
        """
        assert isinstance(mapView, MapView)
        if mapView not in self:
            mapView.sigTitleChanged.connect(lambda *args, mv=mapView: self.onMapViewUpdated(mv))
            #mapView.sigVisibilityChanged.connect(lambda *args, mv=mapView: self.onMapViewUpdated(mv))
            mapView.sigCanvasAppearanceChanged.connect(lambda *args, mv=mapView: self.onMapViewUpdated(mv))
            self.sigMapCanvasColorChanged.connect(mapView.setMapBackgroundColor)
            self.sigMapCanvasTextFormatChanged.connect(mapView.setMapTextFormat)
            i = self.toolBox.addItem(mapView, mapView.windowIcon(), mapView.title())
            self.toolBox.setCurrentIndex(i)

            self.onMapViewUpdated(mapView)

            if len(self.mapViews()) == 1:
                self.setMapTextFormat(mapView.mapTextFormat())

            self.sigMapViewAdded.emit(mapView)

    def onToolboxIndexChanged(self):

        b = isinstance(self.toolBox.currentWidget(), MapView)
        self.actionRemoveMapView.setEnabled(b)

    def onMapViewUpdated(self, mapView:MapView):
        """
        Handles updates that react on MapView changes
        :param mapView: MapView to make the update for
        """
        numMV = 0
        for i in range(self.toolBox.count()):
            item = self.toolBox.widget(i)
            if isinstance(item, MapView):
                numMV += 1
            if item == mapView:

                if mapView.isVisible():
                    icon = QIcon(":/timeseriesviewer/icons/mapview.svg")
                else:
                    icon = QIcon(":/timeseriesviewer/icons/mapviewHidden.svg")

                self.toolBox.setItemIcon(i, icon)
                self.toolBox.setItemText(i, 'Map View {} "{}"'.format(numMV, mapView.title()))
                break

    def removeMapView(self, mapView:MapView)->MapView:
        """
        Removes a MapView
        :param mapView: MapView
        :return: MapView
        """
        if mapView in self.mapViews():
            for i in range(self.toolBox.count()):
                w = self.toolBox.widget(i)
                if isinstance(w, MapView) and w == mapView:
                    self.toolBox.removeItem(i)
                    mapView.close()
                    if self.toolBox.count() >= i:
                        self.toolBox.setCurrentIndex(min(i, self.toolBox.count()-1))

            self.sigMapViewRemoved.emit(mapView)
        return mapView



    def __len__(self)->int:
        """
        Returns the number of MapViews
        :return: int
        """
        return len(self.mapViews())

    def __iter__(self):
        """
        Provides an iterator over all MapViews
        :return:
        """
        return iter(self.mapViews())

    def __getitem__(self, slice):
        return self.mapViews()[slice]

    def __contains__(self, mapView):
        return mapView in self.mapViews()

    def index(self, mapView):
        assert isinstance(mapView, MapView)
        return self.mapViews().index(mapView)

    def addSensor(self, sensor:SensorInstrument):
        """
        Adds a new SensorInstrument
        :param sensor: SensorInstrument
        """
        for mapView in self.mapViews():
            mapView.addSensor(sensor)


    def removeSensor(self, sensor:SensorInstrument):
        """
        Removes a Sensor
        :param sensor: SensorInstrument
        """
        for mapView in self.mapViews():
            assert isinstance(mapView, MapView)
            mapView.removeSensor(sensor)

    def applyStyles(self):
        for mapView in self.mMapViews:
            mapView.applyStyles()

    def setCrosshairStyle(self, crosshairStyle):
        for mapView in self.mMapViews:
            mapView.setCrosshairStyle(crosshairStyle)

    def setShowCrosshair(self, b):
        for mapView in self.mMapViews:
            mapView.setCrosshairVisibility(b)

    def index(self, mapView):
        assert isinstance(mapView, MapView)
        return self.mapViewsDefinitions.index(mapView)


    def setCurrentMapView(self, mapView):
        assert isinstance(mapView, MapView) and mapView in self.mapViews()
        self.toolBox.setCurrentWidget(mapView)
        self.updateTitle()

    def updateTitle(self, *args):
        # self.btnToggleMapViewVisibility.setChecked(mapView)
        mapView = self.currentMapView()
        if isinstance(mapView, MapView):
            title = '{} | {}'.format(self.baseTitle, mapView.title())
        else:
            title = self.baseTitle
        self.setWindowTitle(title)

    def currentMapView(self):
        w = self.toolBox.currentWidget()
        if isinstance(w, MapView):
            return w
        return None
