# -*- coding: utf-8 -*-
"""
/***************************************************************************
                              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.                                   *
 *                                                                         *
 ***************************************************************************/
"""
from qgis.PyQt.QtCore import QAbstractListModel, QAbstractTableModel, QModelIndex, QSortFilterProxyModel, Qt
from qgis.PyQt.QtWidgets import QHeaderView
from qgis.gui import QgsDockWidget

from eotimeseriesviewer import DIR_UI
from eotimeseriesviewer.qgispluginsupport.qps.utils import loadUi
from eotimeseriesviewer.sensors import SensorInstrument
from eotimeseriesviewer.timeseries.source import TimeSeriesDate
from eotimeseriesviewer.timeseries.timeseries import TimeSeries


class SensorDockUI(QgsDockWidget):
    def __init__(self, parent=None):
        super(SensorDockUI, self).__init__(parent)
        loadUi(DIR_UI / 'sensordock.ui', self)

        self.TS = None
        self.mSensorModel: SensorTableModel = None
        self.mSortedModel: QSortFilterProxyModel = QSortFilterProxyModel()

    def setTimeSeries(self, timeSeries):
        assert isinstance(timeSeries, TimeSeries)
        self.TS = timeSeries
        self.mSensorModel = SensorTableModel(self.TS)
        self.mSortedModel.setSourceModel(self.mSensorModel)
        self.sensorView.setModel(self.mSortedModel)
        self.sensorView.horizontalHeader().setSectionResizeMode(QHeaderView.ResizeToContents)


class SensorTableModel(QAbstractTableModel):
    def __init__(self, timeSeries: TimeSeries, parent=None, *args):

        super(SensorTableModel, self).__init__()
        assert isinstance(timeSeries, TimeSeries)

        # define column names
        self.mCN_Name = "Name"
        self.mCN_Band = "Band"
        self.mCN_Dates = "Dates"
        self.mCN_Images = "Images"
        self.mCN_WL = "Wavelength"
        self.mCN_ID = "ID"

        self.mColumNames = [self.mCN_Name, self.mCN_Band, self.mCN_Dates, self.mCN_Images,
                            self.mCN_WL, self.mCN_ID]

        self.TS = timeSeries

        self.TS.sigSensorAdded.connect(self.addSensor)
        self.TS.sigSensorRemoved.connect(self.removeSensor)
        self.TS.sigTimeSeriesDatesAdded.connect(self.onTimeSeriesSourceChanges)
        self.TS.sigTimeSeriesDatesRemoved.connect(self.onTimeSeriesSourceChanges)
        self.mSensors = []
        for s in self.TS.sensors():
            self.addSensor(s)

    def onTimeSeriesSourceChanges(self, timeSeriesDates: list):
        """
        Reaction on changes in the time series data sources
        :param timeSeriesDates: list
        """
        sensors = set()
        for tsd in timeSeriesDates:
            assert isinstance(tsd, TimeSeriesDate)
            sensors.add(tsd.sensor())

        for sensor in sensors:
            self.updateSensor(sensor)

    def addSensor(self, sensor: SensorInstrument):
        """
        Adds a sensor
        :param sensor: SensorInstrument
        """
        assert isinstance(sensor, SensorInstrument)
        i = self.rowCount()
        self.beginInsertRows(QModelIndex(), i, i)
        self.mSensors.append(sensor)
        sensor.sigNameChanged.connect(lambda *args, s=sensor: self.updateSensor(s))
        self.endInsertRows()

    def updateSensor(self, sensor: SensorInstrument):
        assert isinstance(sensor, SensorInstrument)
        if sensor in self.mSensors:
            tl = self.getIndexFromSensor(sensor)
            br = self.createIndex(tl.row(), self.columnCount() - 1)
            self.dataChanged.emit(tl, br)

    def removeSensor(self, sensor: SensorInstrument):
        """
        Removes a SensorInstrument
        :param sensor: SensorInstrument
        """
        assert isinstance(sensor, SensorInstrument)
        if sensor in self.mSensors:
            i = self.mSensors.index(sensor)
            self.beginRemoveRows(QModelIndex(), i, i)
            self.mSensors.remove(sensor)
            self.endRemoveRows()

    def rowCount(self, parent=QModelIndex()):
        return len(self.mSensors)

    def removeRows(self, row, count, parent=QModelIndex()):
        self.beginRemoveRows(parent, row, row + count - 1)
        toRemove = self.mSensors[row:row + count]
        for tsd in toRemove:
            self.mSensors.remove(tsd)
        self.endRemoveRows()

    def getIndexFromSensor(self, sensor) -> QModelIndex:
        return self.createIndex(self.mSensors.index(sensor), 0)

    def getSensorFromIndex(self, index) -> SensorInstrument:
        if index.isValid():
            return self.mSensors[index.row()]
        return None

    def columnCount(self, parent=QModelIndex()):
        return len(self.mColumNames)

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

        value = None
        columnName = self.mColumNames[index.column()]

        sensor = self.getSensorFromIndex(index)
        assert isinstance(sensor, SensorInstrument)

        if role in [Qt.DisplayRole, Qt.EditRole]:

            if columnName == self.mCN_Name:
                value = sensor.name()

            elif columnName == self.mCN_Band:
                value = str(sensor.nb)

            elif columnName == self.mCN_Images:
                n = 0
                for tsd in self.TS.tsds(sensor=sensor):
                    assert isinstance(tsd, TimeSeriesDate)
                    n += len(tsd.sources())
                value = n

            elif columnName == self.mCN_Dates:
                value = len(self.TS.tsds(sensor=sensor))

            elif columnName == self.mCN_ID:
                value = sensor.id()

            elif columnName == self.mCN_WL:
                if sensor.wl is None or len(sensor.wl) == 0:
                    value = 'undefined'
                else:
                    value = ','.join([str(w) for w in sensor.wl])
                    if sensor.wlu is not None:
                        value += '[{}]'.format(sensor.wlu)

        elif role == Qt.CheckStateRole:
            if columnName == self.mCN_Name:
                value = None

        elif role == Qt.UserRole:
            value = sensor

        return value

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

        columnName = self.mColumNames[index.column()]

        sensor = self.getSensorFromIndex(index)
        assert isinstance(sensor, SensorInstrument)
        b = False
        if role == Qt.EditRole and columnName == self.mCN_Name:
            if len(value) == 0:  # do not accept empty strings
                b = False
            else:
                sensor.setName(str(value))
                b = True

        # data changed will be emitted via signal from sensor in updateSensor

        return b

    def index(self, row: int, col: int, parent: QModelIndex = None):
        return self.createIndex(row, col, self.mSensors[row])

    def flags(self, index):
        if index.isValid():
            columnName = self.mColumNames[index.column()]
            flags = Qt.ItemIsEnabled | Qt.ItemIsSelectable
            if columnName in [self.mCN_Name]:  # allow check state
                flags = flags | Qt.ItemIsUserCheckable | Qt.ItemIsEditable
            return flags
            # return item.qt_flags(index.column())
        return None

    def headerData(self, col, orientation, role):
        if Qt is None:
            return None
        if orientation == Qt.Horizontal and role == Qt.DisplayRole:
            return self.mColumNames[col]
        elif orientation == Qt.Vertical and role == Qt.DisplayRole:
            return col + 1
        return None


class SensorListModel(QAbstractListModel):

    def __init__(self, timeSeries: TimeSeries, parent=None, *args):

        super(SensorListModel, self).__init__()
        assert isinstance(timeSeries, TimeSeries)
        self.TS = timeSeries
        self.TS.sigSensorAdded.connect(self.insertSensor)
        self.TS.sigSensorRemoved.connect(self.removeSensor)

        self.mSensors = []
        self.sortColumnIndex = 0
        self.sortOrder = Qt.AscendingOrder
        for s in self.TS.sensors():
            self.insertSensor(s)

    def insertSensor(self, sensor, i=None):
        assert isinstance(sensor, SensorInstrument)
        if i is None:
            i = len(self.mSensors)
            self.beginInsertRows(QModelIndex(), i, i)
            self.mSensors.insert(i, sensor)
            self.endInsertRows()

    def removeSensor(self, sensor):
        assert isinstance(sensor, SensorInstrument)
        if sensor in self.mSensors:
            i = self.mSensors.index(sensor)
            self.beginRemoveRows(QModelIndex(), i, i)
            self.mSensors.remove(sensor)
            self.endRemoveRows()

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

        self.layoutAboutToBeChanged.emit()
        r = order != Qt.AscendingOrder
        self.mSensors.sort(key=lambda s: s.name(), reverse=r)
        self.layoutChanged.emit()

    def rowCount(self, parent=QModelIndex()):
        return len(self.mSensors)

    def removeRows(self, row, count, parent=QModelIndex()):
        self.beginRemoveRows(parent, row, row + count - 1)
        toRemove = self.mSensors[row:row + count]
        for tsd in toRemove:
            self.mSensors.remove(tsd)
        self.endRemoveRows()

    def sensor2idx(self, sensor):
        assert isinstance(sensor, SensorInstrument)
        return self.createIndex(self.mSensors.index(sensor), 0)

    def idx2sensor(self, index):
        assert isinstance(index, QModelIndex)
        if index.isValid():
            return self.mSensors[index.row()]
        return None

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

        value = None
        sensor = self.idx2sensor(index)
        assert isinstance(sensor, SensorInstrument)

        if role == Qt.DisplayRole:
            value = sensor.name()
        elif role == Qt.UserRole:
            value = sensor
        return value

    def flags(self, index):
        if index.isValid():
            flags = Qt.ItemIsEnabled | Qt.ItemIsSelectable
            return flags
            # return item.qt_flags(index.column())
        return None

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