profilevisualization.py

# -*- coding: utf-8 -*-
"""
/***************************************************************************
                              HUB TimeSeriesViewer
                              -------------------
        begin                : 2017-08-04
        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.                                   *
 *                                                                         *
 ***************************************************************************/
"""
# noinspection PyPep8Naming
from __future__ import absolute_import
import os, sys, pickle, datetime
from collections import OrderedDict
from qgis.gui import *
from qgis.core import *
from PyQt4.QtCore import *
from PyQt4.QtXml import *
from PyQt4.QtGui import *

from timeseriesviewer import jp, SETTINGS
from timeseriesviewer.timeseries import *
from timeseriesviewer.utils import SpatialExtent, SpatialPoint, px2geo
from timeseriesviewer.ui.docks import TsvDockWidgetBase, loadUI
from timeseriesviewer.plotstyling import PlotStyle, PlotStyleButton
from timeseriesviewer.pixelloader import PixelLoader, PixelLoaderTask
from timeseriesviewer.sensorvisualization import SensorListModel

import pyqtgraph as pg
from pyqtgraph import functions as fn
from pyqtgraph import AxisItem


import datetime

from osgeo import gdal, gdal_array
import numpy as np

DEBUG = False

def getTextColorWithContrast(c):
    assert isinstance(c, QColor)
    if c.lightness() < 0.5:
        return QColor('white')
    else:
        return QColor('black')

class DateTimeAxis(pg.AxisItem):

    def __init__(self, *args, **kwds):
        super(DateTimeAxis, self).__init__(*args, **kwds)

    def logTickStrings(self, values, scale, spacing):
        s = ""


    def tickStrings(self, values, scale, spacing):
        strns = []

        if len(values) == 0:
            return []
        #assert isinstance(values[0],
        values = [num2date(v) for v in values]
        rng = max(values)-min(values)
        ndays = rng.astype(int)

        strns = []

        for v in values:
            if ndays == 0:
                strns.append(v.astype(str))
            else:
                strns.append(v.astype(str))

        return strns

    def tickValues(self, minVal, maxVal, size):
        d = super(DateTimeAxis, self).tickValues(minVal, maxVal, size)

        return d





class _SensorPoints(pg.PlotDataItem):
    def __init__(self, *args, **kwds):
        super(_SensorPoints, self).__init__(*args, **kwds)
        # menu creation is deferred because it is expensive and often
        # the user will never see the menu anyway.
        self.menu = None

    def boundingRect(self):
        return super(SensorPoints,self).boundingRect()

    def paint(self, p, *args):
        super(SensorPoints, self).paint(p, *args)


    # On right-click, raise the context menu
    def mouseClickEvent(self, ev):
        if ev.button() == QtCore.Qt.RightButton:
            if self.raiseContextMenu(ev):
                ev.accept()

    def raiseContextMenu(self, ev):
        menu = self.getContextMenus()

        # Let the scene add on to the end of our context menu
        # (this is optional)
        menu = self.scene().addParentContextMenus(self, menu, ev)

        pos = ev.screenPos()
        menu.popup(QtCore.QPoint(pos.x(), pos.y()))
        return True

    # This method will be called when this item's _children_ want to raise
    # a context menu that includes their parents' menus.
    def getContextMenus(self, event=None):
        if self.menu is None:
            self.menu = QMenu()
            self.menu.setTitle(self.name + " options..")

            green = QAction("Turn green", self.menu)
            green.triggered.connect(self.setGreen)
            self.menu.addAction(green)
            self.menu.green = green

            blue = QAction("Turn blue", self.menu)
            blue.triggered.connect(self.setBlue)
            self.menu.addAction(blue)
            self.menu.green = blue

            alpha = QWidgetAction(self.menu)
            alphaSlider = QSlider()
            alphaSlider.setOrientation(QtCore.Qt.Horizontal)
            alphaSlider.setMaximum(255)
            alphaSlider.setValue(255)
            alphaSlider.valueChanged.connect(self.setAlpha)
            alpha.setDefaultWidget(alphaSlider)
            self.menu.addAction(alpha)
            self.menu.alpha = alpha
            self.menu.alphaSlider = alphaSlider
        return self.menu


class TemporalProfilePlotDataItem(pg.PlotDataItem):

    def __init__(self, plotStyle, parent=None):
        assert isinstance(plotStyle, TemporalProfilePlotStyle)


        super(TemporalProfilePlotDataItem, self).__init__([], [], parent=parent)
        self.mPlotStyle = plotStyle
        self.mPlotStyle.sigUpdated.connect(self.updateStyle)
        self.setClickable(True)
        self.updateData()
        self.updateStyle()

    def updateData(self):
        TP = self.mPlotStyle.temporalProfile()
        sensor = self.mPlotStyle.sensor()
        if isinstance(TP, TemporalProfile) and isinstance(sensor, SensorInstrument):
            x, y = TP.dataFromExpression(self.mPlotStyle.sensor(), self.mPlotStyle.expression())
            if len(y) > 0:
                self.setData(x=x, y=y)
            else:
                self.setData(x=None, y=None)
            self.update()

    def updateStyle(self):
        """
        Updates visibility properties
        """
        self.setVisible(self.mPlotStyle.isVisible())
        self.setPen(self.mPlotStyle.linePen)
        self.setBrush(self.mPlotStyle.markerBrush)

        #self.setFillBrush(self.mPlotStyle.)

    def setClickable(self, b, width=None):
        assert isinstance(b, bool)
        self.curve.setClickable(b, width=width)

    def setColor(self, color):
        if not isinstance(color, QColor):

            color = QColor(color)
        self.setPen(color)

    def pen(self):

        return fn.mkPen(self.opts['pen'])

    def color(self):
        return self.pen().color()

        # On right-click, raise the context menu

    def mouseClickEvent(self, ev):
        if ev.button() == QtCore.Qt.RightButton:
            if self.raiseContextMenu(ev):
                ev.accept()

    def raiseContextMenu(self, ev):
        menu = self.getContextMenus()

        # Let the scene add on to the end of our context menu
        # (this is optional)
        menu = self.scene().addParentContextMenus(self, menu, ev)

        pos = ev.screenPos()
        menu.popup(QtCore.QPoint(pos.x(), pos.y()))
        return True

        # This method will be called when this item's _children_ want to raise
        # a context menu that includes their parents' menus.

    def getContextMenus(self, event=None):
        if self.menu is None:
            self.menu = QMenu()
            self.menu.setTitle(self.name + " options..")

            green = QAction("Turn green", self.menu)
            green.triggered.connect(self.setGreen)
            self.menu.addAction(green)
            self.menu.green = green

            blue = QAction("Turn blue", self.menu)
            blue.triggered.connect(self.setBlue)
            self.menu.addAction(blue)
            self.menu.green = blue

            alpha = QWidgetAction(self.menu)
            alphaSlider = QSlider()
            alphaSlider.setOrientation(QtCore.Qt.Horizontal)
            alphaSlider.setMaximum(255)
            alphaSlider.setValue(255)
            alphaSlider.valueChanged.connect(self.setAlpha)
            alpha.setDefaultWidget(alphaSlider)
            self.menu.addAction(alpha)
            self.menu.alpha = alpha
            self.menu.alphaSlider = alphaSlider
        return self.menu

    def setLineWidth(self, width):
        pen = pg.mkPen(self.opts['pen'])
        assert isinstance(pen, QPen)
        pen.setWidth(width)
        self.setPen(pen)



class PlotSettingsWidgetDelegate(QStyledItemDelegate):
    """

    """
    def __init__(self, tableView, timeSeries, temporalProfileListModel, parent=None):

        super(PlotSettingsWidgetDelegate, self).__init__(parent=parent)
        self._preferedSize = QgsFieldExpressionWidget().sizeHint()
        self.tableView = tableView
        self.timeSeries = timeSeries
        self.temporalProfileListModel = temporalProfileListModel

    def setItemDelegates(self, tableView):
        assert isinstance(tableView, QTableView)
        model = tableView.model()

        assert isinstance(model, PlotSettingsModel)
        for c in [model.cnSensor, model.cnExpression, model.cnStyle,model.cnTemporalProfile]:
            i = model.columNames.index(c)
            tableView.setItemDelegateForColumn(i, self)

    def getColumnName(self, index):
        assert index.isValid()
        model = index.model()
        assert isinstance(model, PlotSettingsModel)
        return model.columNames[index.column()]
    """
    def sizeHint(self, options, index):
        s = super(ExpressionDelegate, self).sizeHint(options, index)
        exprString = self.tableView.model().data(index)
        l = QLabel()
        l.setText(exprString)
        x = l.sizeHint().width() + 100
        s = QSize(x, s.height())
        return self._preferedSize
    """

    def createEditor(self, parent, option, index):
        cname = self.getColumnName(index)
        model = self.tableView.model()
        w = None
        if index.isValid() and isinstance(model, PlotSettingsModel):
            plotStyle = model.idx2plotStyle(index)
            if isinstance(plotStyle, TemporalProfilePlotStyle):
                if cname == model.cnExpression:
                    w = QgsFieldExpressionWidget(parent=parent)

                    #todo: w.setLayer(sv.memLyr)
                    w.setExpressionDialogTitle('Values')
                    w.setToolTip('Set an expression to calculate the plot y-values.')
                    w.fieldChanged.connect(lambda : self.checkData(w, w.expression()))

                elif cname == model.cnStyle:
                    w = PlotStyleButton(parent=parent)
                    w.setPlotStyle(plotStyle)
                    w.setToolTip('Set style.')
                    w.sigPlotStyleChanged.connect(lambda: self.checkData(w, w.plotStyle()))

                elif cname == model.cnSensor:
                    w = QComboBox(parent=parent)
                    m = SensorListModel(self.timeSeries)
                    w.setModel(m)

                elif cname == model.cnTemporalProfile:
                    w = QComboBox(parent=parent)
                    w.setModel(self.temporalProfileListModel)
                else:
                    raise NotImplementedError()
        return w

    def checkData(self, w, expression):
        if isinstance(w, QgsFieldExpressionWidget):
            assert expression == w.expression()
            assert w.isExpressionValid(expression) == w.isValidExpression()

            if w.isValidExpression():
                self.commitData.emit(w)
            else:
                s = ""
                #print(('Delegate commit failed',w.asExpression()))
        if isinstance(w, PlotStyleButton):

            self.commitData.emit(w)

    def setEditorData(self, editor, index):
        cname = self.getColumnName(index)
        model = self.tableView.model()

        w = None
        if index.isValid() and isinstance(model, PlotSettingsModel):

            cname = self.getColumnName(index)
            if cname == model.cnExpression:
                lastExpr = index.model().data(index, Qt.DisplayRole)
                assert isinstance(editor, QgsFieldExpressionWidget)
                editor.setProperty('lastexpr', lastExpr)
                editor.setField(lastExpr)

            elif cname == model.cnStyle:
                style = index.data()
                assert isinstance(editor, PlotStyleButton)
                editor.setPlotStyle(style)

            elif cname == model.cnSensor:
                assert isinstance(editor, QComboBox)
                m = editor.model()
                assert isinstance(m, SensorListModel)
                sensor = index.data(role=Qt.UserRole)
                if isinstance(sensor, SensorInstrument):
                    idx = m.sensor2idx(sensor)
                    editor.setCurrentIndex(idx.row())
            elif cname == model.cnTemporalProfile:
                assert isinstance(editor, QComboBox)
                m = editor.model()
                assert isinstance(m, TemporalProfileCollectionListModel)
                TP = index.data(role=Qt.UserRole)
                if isinstance(TP, TemporalProfile):
                    idx = m.tp2idx(TP)
                    editor.setCurrentIndex(idx)
            else:
                raise NotImplementedError()

    def setModelData(self, w, model, index):
        cname = self.getColumnName(index)
        model = self.tableView.model()

        if index.isValid() and isinstance(model, PlotSettingsModel):
            if cname == model.cnExpression:
                assert isinstance(w, QgsFieldExpressionWidget)
                expr = w.asExpression()
                exprLast = model.data(index, Qt.DisplayRole)

                if w.isValidExpression() and expr != exprLast:
                    model.setData(index, w.asExpression(), Qt.EditRole)

            elif cname == model.cnStyle:
                assert isinstance(w, PlotStyleButton)
                model.setData(index, w.plotStyle(), Qt.UserRole)

            elif cname == model.cnSensor:
                assert isinstance(w, QComboBox)
                sensor = w.itemData(w.currentIndex(), role=Qt.UserRole)
                assert isinstance(sensor, SensorInstrument)
                model.setData(index, sensor, Qt.EditRole)

            elif cname == model.cnTemporalProfile:
                assert isinstance(w, QComboBox)
                TP = w.itemData(w.currentIndex(), role=Qt.UserRole)
                assert isinstance(TP, TemporalProfile)
                model.setData(index, TP, Qt.EditRole)

            else:
                raise NotImplementedError()


class SensorPixelDataMemoryLayer(QgsVectorLayer):

    def __init__(self, sensor, crs=None):
        assert isinstance(sensor, SensorInstrument)
        if crs is None:
            crs = QgsCoordinateReferenceSystem('EPSG:4862')
        uri = 'Point?crs={}'.format(crs.authid())
        super(SensorPixelDataMemoryLayer, self).__init__(uri, 'Pixels_sensor_' + sensor.name(), 'memory', False)
        self.mSensor = sensor

        #initialize fields
        assert self.startEditing()
        # standard field names, types, etc.
        fieldDefs = [('pxid', QVariant.String, 'integer'),
                     ('date', QVariant.String, 'char'),
                     ('doy', QVariant.Int, 'integer'),
                     ('geo_x', QVariant.Double, 'decimal'),
                     ('geo_y', QVariant.Double, 'decimal'),
                     ('px_x', QVariant.Int, 'integer'),
                     ('px_y', QVariant.Int, 'integer'),
                     ]
        # one field for each band
        for b in range(sensor.nb):
            fName = 'b{}'.format(b + 1)
            fieldDefs.append((fName, QVariant.Double, 'decimal'))

        # initialize fields
        for fieldDef in fieldDefs:
            field = QgsField(fieldDef[0], fieldDef[1], fieldDef[2])
            self.addAttribute(field)
        self.commitChanges()

    def sensor(self):
        return self.mSensor

    def nPixels(self):
        raise NotImplementedError()

    def dates(self):
        raise NotImplementedError()


class TemporalProfileCollectionListModel(QAbstractListModel):


    def __init__(self, temporalProfileCollection, *args, **kwds):

        super(TemporalProfileCollectionListModel, self).__init__(*args, **kwds)
        assert isinstance(temporalProfileCollection, TemporalProfileCollection)

        self.mTPColl = temporalProfileCollection
        self.mTPColl.rowsAboutToBeInserted.connect(self.rowsAboutToBeInserted)
        self.mTPColl.rowsInserted.connect(self.rowsInserted.emit)
        self.mTPColl.rowsAboutToBeRemoved.connect(self.rowsAboutToBeRemoved)
        self.mTPColl.rowsRemoved.connect(self.rowsRemoved.emit)

    def idx2tp(self, *args, **kwds):
        return self.mTPColl.idx2tp(*args, **kwds)

    def tp2idx(self, *args, **kwds):
        return self.mTPColl.tp2idx(*args, **kwds)

    def flags(self, index):
        if index.isValid():
            flags = Qt.ItemIsEnabled | Qt.ItemIsSelectable
            return flags
            #return item.qt_flags(index.column())
        return Qt.NoItemFlags

    def rowCount(self, *args, **kwds):
        return self.mTPColl.rowCount(*args, **kwds)


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

        TP = self.mTPColl.data(index, role=Qt.UserRole)
        value = None
        if isinstance(TP, TemporalProfile):
            if role == Qt.DisplayRole:
                value = '{}'.format(TP.name())
            elif role == Qt.ToolTipRole:
                value = '#{} "{}" {}'.format(TP.mID, TP.name(), TP.mCoordinate)
            elif role == Qt.UserRole:
                value = TP

        return value

class TemporalProfileCollection(QAbstractTableModel):
    """
    A collection to store the TemporalProfile data delivered by a PixelLoader
    """

    #sigSensorAdded = pyqtSignal(SensorInstrument)
    #sigSensorRemoved = pyqtSignal(SensorInstrument)
    #sigPixelAdded = pyqtSignal()
    #sigPixelRemoved = pyqtSignal()

    def __init__(self, ):
        super(TemporalProfileCollection, self).__init__()
        #self.sensorPxLayers = dict()
        #self.memLyrCrs = QgsCoordinateReferenceSystem('EPSG:4326')
        self.newDataFlag = False

        self.mcnID = 'id'
        self.mcnCoordinate = 'Coordinate'
        self.mcnLoaded = 'Loading'
        self.mcnName = 'Name'
        self.mColumNames = [self.mcnName, self.mcnLoaded, self.mcnCoordinate]

        crs = QgsCoordinateReferenceSystem('EPSG:4862')
        uri = 'Point?crs={}'.format(crs.authid())

        self.TS = None
        self.mLocations = QgsVectorLayer(uri, 'LOCATIONS', 'memory', False)
        self.mTemporalProfiles = []
        self.mTPLookupSpatialPoint = {}
        self.mTPLookupID = {}
        self.mCurrentTPID = 0
        self.mMaxProfiles = 10

        self.nextID = 0

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

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

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

    def __contains__(self, item):
        return item in self.mTemporalProfiles

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

    def columnCount(self, QModelIndex_parent=None, *args, **kwargs):
        return len(self.mColumNames)

    def idx2tp(self, index):
        if index.isValid():
            return self.mTemporalProfiles[index.row()]
        return None

    def tp2idx(self, temporalProfile):
        assert isinstance(temporalProfile, TemporalProfile)
        idx = self.createIndex(None, -1, 0)
        if temporalProfile in self.mTemporalProfiles:
            idx.setRow(self.mTemporalProfiles.index(temporalProfile))
        return idx

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

        value = None
        columnName = self.mColumNames[index.column()]
        TP = self.idx2tp(index)
        if not isinstance(TP, TemporalProfile):
            return None
        #self.mColumNames = ['id','coordinate','loaded']
        if role == Qt.DisplayRole:
            if columnName == self.mcnID:
                value = TP.mID
            elif columnName == self.mcnName:
                value = TP.name()
            elif columnName == self.mcnCoordinate:
                value = '{}'.format(TP.mCoordinate)
            elif columnName == self.mcnLoaded:
                nIs, nMax = TP.loadingStatus()
                if nMax > 0:
                    value = '{}/{} ({:0.2f} %)'.format(nIs, nMax, float(nIs) / nMax * 100)
        elif role == Qt.EditRole:
            if columnName == self.mcnName:
                value = TP.name()
        elif role == Qt.ToolTipRole:
            if columnName == self.mcnID:
                value = 'ID Temporal Profile'
            elif columnName == self.mcnName:
                value = TP.name()
            elif columnName == self.mcnCoordinate:
                value = '{}'.format(TP.mCoordinate)
            elif columnName == self.mcnLoaded:
                nIs, nMax = TP.loadingStatus()
                value = '{}'.format(TP.mCoordinate)
        elif role == Qt.UserRole:
            value = TP

        return value

    def flags(self, index):
        if index.isValid():
            flags = Qt.ItemIsEnabled | Qt.ItemIsSelectable

            cName = self.mColumNames[index.column()]
            if cName == self.mcnName:
                flags = flags | Qt.ItemIsEditable

            return flags
            #return item.qt_flags(index.column())
        return None


    def setData(self, index, value, role=None):
        if role is None or not index.isValid():
            return None

        cName = self.mColumNames[index.column()]
        TP = self.idx2tp(index)
        if isinstance(TP, TemporalProfile):
            if role == Qt.EditRole and cName == self.mcnName:
                if len(value) == 0: #do not accept empty strings
                    return False
                else:
                    TP.setName(value)
                return True

        return False

    def headerData(self, col, orientation, role):
        if Qt is None:
            return None
        if role == Qt.DisplayRole:
            if orientation == Qt.Horizontal:
                return self.mColumNames[col]
            elif orientation == Qt.Vertical:
                return col
        return None

    def insertTemporalProfiles(self, temporalProfiles, i=None):
        if isinstance(temporalProfiles, TemporalProfile):
            temporalProfiles = [temporalProfiles]

        assert isinstance(temporalProfiles, list)
        for temporalProfile in temporalProfiles:
            assert isinstance(temporalProfile, TemporalProfile)

        if i is None:
            i = len(self.mTemporalProfiles)

        self.beginInsertRows(QModelIndex(), i, i + len(temporalProfiles) - 1)
        for temporalProfile in temporalProfiles:
            assert isinstance(temporalProfile, TemporalProfile)
            id = self.nextID
            self.nextID += 1
            temporalProfile.mID = id
            self.mTemporalProfiles.insert(i, temporalProfile)
            self.mTPLookupID[id] = temporalProfile
            self.mTPLookupSpatialPoint[temporalProfile.mCoordinate] = temporalProfile
            i += 1
        self.endInsertRows()

    def temporalProfileFromGeometry(self, geometry):
        if geometry in self.mTPLookupSpatialPoint.keys():
            return self.mTPLookupSpatialPoint[geometry]
        else:
            return None

    def temporalProfileFromID(self, id):
        if id in self.mTPLookupID.keys():
            return self.mTPLookupID[id]
        else:
            return None

    def id(self, temporalProfile):
        """
        Returns the id of an TemporalProfile
        :param temporalProfile: TemporalProfile
        :return: id or None, inf temporalProfile is not part of this collections
        """

        for k, tp in self.mTPLookupID.items():
            if tp == temporalProfile:
                return k
        return None

    def fromID(self, id):
        if self.mTPLookupID.has_key(id):
            return self.mTPLookupID[id]
        else:
            return None

    def fromSpatialPoint(self, spatialPoint):
        if self.mTPLookupSpatialPoint.has_key(spatialPoint):
            return self.mTPLookupSpatialPoint[spatialPoint]
        else:
            return None

    def removeTemporalProfiles(self, temporalProfiles):
        """
        Removes temporal profiles from this collection
        :param temporalProfile: TemporalProfile
        """

        if isinstance(temporalProfiles, TemporalProfile):
            temporalProfiles = [temporalProfiles]
        assert isinstance(temporalProfiles, list)

        for temporalProfile in temporalProfiles:
            assert isinstance(p, TemporalProfile)
            if temporalProfile in self.mTemporalProfiles:

                idx = self.tp2idx(temporalProfile)
                row = idx.row()
                self.beginRemoveRows(QModelIndex(), row, row)
                self.mTemporalProfiles.remove(temporalProfile)
                self.mTPLookupSpatialPoint.__delitem__(temporalProfile)
                self.mTPLookupID.__delitem__(temporalProfile)
                self.endRemoveRows()

    def connectTimeSeries(self, timeSeries):
        self.clear()

        if isinstance(timeSeries, TimeSeries):
            self.TS = timeSeries
            #for sensor in self.TS.Sensors:
            #    self.addSensor(sensor)
            #self.TS.sigSensorAdded.connect(self.addSensor)
            #self.TS.sigSensorRemoved.connect(self.removeSensor)
        else:
            self.TS = None

    def setMaxProfiles(self, n):
        """
        Sets the maximum number of temporal profiles to be stored in this container.
        :param n: number of profiles, must be >= 1
        """
        assert n >= 1
        self.mMaxProfiles = n

        self.prune()

    def prune(self):
        """
        Reduces the number of temporal profile to the value n defined with .setMaxProfiles(n)
        :return: [list-of-removed-TemporalProfiles]
        """



    def getFieldDefn(self, name, values):
        if isinstance(values, np.ndarray):
            # add bands
            if values.dtype in [np.int8, np.int16, np.int32, np.int64,
                                np.uint8, np.uint16, np.uint32, np.uint64]:
                fType = QVariant.Int
                fTypeName = 'integer'
            elif values.dtype in [np.float16, np.float32, np.float64]:
                fType = QVariant.Double
                fTypeName = 'decimal'
        else:
            raise NotImplementedError()

        return QgsField(name, fType, fTypeName)

    def setFeatureAttribute(self, feature, name, value):
        assert isinstance(feature, QgsFeature)
        assert isinstance(name, str)
        i = feature.fieldNameIndex(name)
        assert i >= 0, 'Field "{}" does not exist'.format(name)
        field = feature.fields()[i]
        if field.isNumeric():
            if field.type() == QVariant.Int:
                value = int(value)
            elif field.type() == QVariant.Double:
                value = float(value)
            else:
                raise NotImplementedError()
        feature.setAttribute(i, value)

    def sort(self, col, order):
        if self.rowCount() == 0:
            return

        self.layoutAboutToBeChanged.emit()
        colName = self.mColumNames[col]
        r = order != Qt.AscendingOrder

        if colName == self.mcnName:
            self.items.sort(key = lambda TP:TP.name(), reverse=r)
        elif colName == self.mcnCoordinate:
            self.items.sort(key=lambda TP: str(TP.mCoordinate), reverse=r)
        elif colName == self.mcnID:
            self.items.sort(key=lambda TP: TP.mID, reverse=r)
        elif colName == self.mcnLoaded:
            self.items.sort(key=lambda TP: TP.loadingStatus(), reverse=r)
        self.layoutChanged.emit()


    def addPixelLoaderResult(self, d):
        assert isinstance(d, PixelLoaderTask)
        if d.success():

            for i, TPid in enumerate(d.temporalProfileIDs):

                TP = self.temporalProfileFromID(TPid)
                tsd = self.TS.getTSD(d.sourcePath)
                assert isinstance(tsd, TimeSeriesDatum)

                if isinstance(TP, TemporalProfile):
                    profileData = d.resProfiles[i]
                    vMean, vStd = profileData

                    values = {}
                    #1. add the pixel values per returned band
                    for iBand, bandIndex in enumerate(d.bandIndices):
                        key = 'b{}'.format(bandIndex + 1)
                        values[key] = vMean[iBand]
                        key = 'std{}'.format(bandIndex + 1)
                        values[key] = vStd[iBand]

                    #indicesY, indicesX = d.imagePixelIndices()
                    #values['px_x'] = indicesX
                    #values['px_y'] = indicesY

                    TP.updateData(tsd, values)

    def clear(self):
        #todo: remove TS Profiles
        #self.mTemporalProfiles.clear()
        #self.sensorPxLayers.clear()
        pass



class TemporalProfilePlotStyle(PlotStyle):

    sigUpdated = pyqtSignal()

    def __init__(self, temporalProfile):
        super(TemporalProfilePlotStyle, self).__init__()
        assert isinstance(temporalProfile, TemporalProfile)
        self.mSensor = None
        self.mTP = temporalProfile
        self.mExpression = u'"b1"'
        self.mPlotItems = []

        if isinstance(temporalProfile, TemporalProfile):
            self.setTemporalProfile(temporalProfile)

    def createPlotItem(self, plotWidget):
        pdi = TemporalProfilePlotDataItem(self)
        self.mPlotItems.append(pdi)
        return pdi

    def temporalProfile(self):
        return self.mTP

    def setTemporalProfile(self, temporalPofile):
        assert isinstance(temporalPofile, TemporalProfile)
        b = temporalPofile != self.mTP
        self.mTP = temporalPofile
        if b: self.sigUpdated.emit()

    def setSensor(self, sensor):
        assert isinstance(sensor, SensorInstrument)
        b = sensor != self.mSensor
        self.mSensor = sensor
        if b: self.sigUpdated.emit()



    def sensor(self):
        return self.mSensor


    def setExpression(self, exp):
        assert isinstance(exp, unicode)
        b = self.mExpression != exp
        self.mExpression = exp
        if b: self.sigUpdated.emit()

    def expression(self):
        return self.mExpression

    def __reduce_ex__(self, protocol):
        return self.__class__, (), self.__getstate__()

    def __getstate__(self):
        result = super(TemporalProfilePlotStyle, self).__getstate__()
        #remove
        del result['mTP']
        del result['mSensor']

        return result




class DateTimeViewBox(pg.ViewBox):
    """
    Subclass of ViewBox
    """
    sigMoveToDate = pyqtSignal(np.datetime64)
    def __init__(self, parent=None):
        """
        Constructor of the CustomViewBox
        """
        super(DateTimeViewBox, self).__init__(parent)
        #self.menu = None # Override pyqtgraph ViewBoxMenu
        #self.menu = self.getMenu() # Create the menu
        #self.menu = None


    def raiseContextMenu(self, ev):

        pt = self.mapDeviceToView(ev.pos())
        print(pt.x(), pt.y())
        date = num2date(pt.x())
        menu = QMenu(None)
        a = menu.addAction('Move to {}'.format(date))
        a.setData(date)
        a.triggered.connect(lambda : self.sigMoveToDate.emit(date))
        self.scene().addParentContextMenus(self, menu, ev)
        menu.exec_(ev.screenPos().toPoint())




class DateTimePlotWidget(pg.PlotWidget):
    """
    Subclass of PlotWidget
    """
    def __init__(self, parent=None):
        """
        Constructor of the widget
        """
        super(DateTimePlotWidget, self).__init__(parent, viewBox=DateTimeViewBox())
        self.plotItem = pg.PlotItem(
            axisItems={'bottom':DateTimeAxis(orientation='bottom')},
            viewBox=DateTimeViewBox()
        )
        self.setCentralItem(self.plotItem)



class PlotSettingsModel(QAbstractTableModel):

    #sigSensorAdded = pyqtSignal(SensorPlotSettings)
    sigVisibilityChanged = pyqtSignal(TemporalProfilePlotStyle)
    sigDataChanged = pyqtSignal(TemporalProfilePlotStyle)

    regBandKey = re.compile("(?<!\w)b\d+(?!\w)", re.IGNORECASE)
    regBandKeyExact = re.compile('^' + regBandKey.pattern + '$', re.IGNORECASE)

    def __init__(self, temporalProfileCollection, plotWidget, parent=None, *args):

        #assert isinstance(tableView, QTableView)

        super(PlotSettingsModel, self).__init__(parent=parent)
        assert isinstance(temporalProfileCollection, TemporalProfileCollection)

        self.cnID = 'ID'
        self.cnSensor = 'sensor'
        self.cnExpression = 'y-value'
        self.cnStyle = 'style'
        self.cnTemporalProfile = 'px'
        self.columNames = [self.cnTemporalProfile, self.cnSensor, self.cnStyle, self.cnExpression]

        self.mPlotSettings = []
        self.mPlotDataItems = []
        #assert isinstance(plotWidget, DateTimePlotWidget)
        self.mPlotWidget = plotWidget
        self.sortColumnIndex = 0
        self.sortOrder = Qt.AscendingOrder
        self.tpCollection = temporalProfileCollection

        assert isinstance(self.tpCollection.TS, TimeSeries)
        #self.tpCollection.TS.sigSensorAdded.connect(self.addPlotItem)
        #self.tpCollection.TS.sigSensorRemoved.connect(self.removeSensor)

        self.sort(0, Qt.AscendingOrder)
        self.dataChanged.connect(self.signaler)

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

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