# -*- coding: utf-8 -*-
"""
/***************************************************************************
 ShadowGenerator
                                 A QGIS plugin
 Simulate casting shadows
                              -------------------
        begin                : 2015-04-10
        git sha              : $Format:%H$
        copyright            : (C) 2015 by Fredrik Lindberg
        email                : fredrikl@gvc.gu.se
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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 __future__ import absolute_import
from builtins import str
from builtins import object
from qgis.PyQt.QtCore import QSettings, QTranslator, qVersion, QCoreApplication
from qgis.PyQt.QtWidgets import QAction, QFileDialog, QMessageBox
from qgis.PyQt.QtGui import QIcon
from qgis.gui import QgsMapLayerComboBox
from qgis.core import QgsMapLayerProxyModel
from qgis.core import QgsProject
# Initialize Qt resources from file resources.py
# from . import resources_rc
# Import the code for the dialog
from .shadow_generator_dialog import ShadowGeneratorDialog
from osgeo import gdal, osr
#import gdal from gdalconst import *
import os.path
from . import dailyshading as dsh
import numpy as np
import webbrowser


class ShadowGenerator(object):
    """QGIS Plugin Implementation."""

    def __init__(self, iface):
        """Constructor.

        :param iface: An interface instance that will be passed to this class
            which provides the hook by which you can manipulate the QGIS
            application at run time.
        :type iface: QgsInterface
        """
        # Save reference to the QGIS interface
        self.iface = iface
        # initialize plugin directory
        self.plugin_dir = os.path.dirname(__file__)
        # initialize locale
        locale = QSettings().value('locale/userLocale')[0:2]
        locale_path = os.path.join(
            self.plugin_dir,
            'i18n',
            'ShadowGenerator_{}.qm'.format(locale))

        if os.path.exists(locale_path):
            self.translator = QTranslator()
            self.translator.load(locale_path)

            if qVersion() > '4.3.3':
                QCoreApplication.installTranslator(self.translator)

        # Create the dialog (after translation) and keep reference
        self.dlg = ShadowGeneratorDialog()
        self.dlg.runButton.clicked.connect(self.start_progress)
        self.dlg.shadowCheckBox.stateChanged.connect(self.checkbox_changed)
        self.dlg.pushButtonHelp.clicked.connect(self.help)
        self.fileDialog = QFileDialog()
        # self.fileDialog.setFileMode(4)
        # self.fileDialog.setAcceptMode(1)
        self.fileDialog.setFileMode(QFileDialog.Directory)
        self.fileDialog.setOption(QFileDialog.ShowDirsOnly, True)

        # Declare instance attributes
        self.actions = []
        self.menu = self.tr(u'&Shadow Generator')
        # TODO: We are going to let the user set this up in a future iteration
        # self.toolbar = self.iface.addToolBar(u'ShadowGenerator')
        # self.toolbar.setObjectName(u'ShadowGenerator')
        
        ProjectPath=QgsProject.instance().absolutePath()
        folderPath = os.path.join(ProjectPath,'Step_3')
        self.timeInterval = 30

        # self.layerComboManagerDSM = RasterLayerCombo(self.dlg.comboBox_dsm)
        # RasterLayerCombo(self.dlg.comboBox_dsm, initLayer="")
        # self.layerComboManagerVEGDSM = RasterLayerCombo(self.dlg.comboBox_vegdsm)
        # RasterLayerCombo(self.dlg.comboBox_vegdsm, initLayer="")
        # self.layerComboManagerVEGDSM2 = RasterLayerCombo(self.dlg.comboBox_vegdsm2)
        # RasterLayerCombo(self.dlg.comboBox_vegdsm2, initLayer="")
        self.layerComboManagerDSM = QgsMapLayerComboBox(self.dlg.widgetDSM)
        self.layerComboManagerDSM.setFilters(QgsMapLayerProxyModel.RasterLayer)
        self.layerComboManagerDSM.setFixedWidth(175)
        self.layerComboManagerDSM.setCurrentIndex(-1)
        self.layerComboManagerVEGDSM = QgsMapLayerComboBox(self.dlg.widgetCDSM)
        self.layerComboManagerVEGDSM.setFilters(QgsMapLayerProxyModel.RasterLayer)
        self.layerComboManagerVEGDSM.setFixedWidth(175)
        self.layerComboManagerVEGDSM.setCurrentIndex(-1)
        self.layerComboManagerVEGDSM2 = QgsMapLayerComboBox(self.dlg.widgetTDSM)
        self.layerComboManagerVEGDSM2.setFilters(QgsMapLayerProxyModel.RasterLayer)
        self.layerComboManagerVEGDSM2.setFixedWidth(175)
        self.layerComboManagerVEGDSM2.setCurrentIndex(-1)
        self.layerComboManagerWH = QgsMapLayerComboBox(self.dlg.widgetWallHeight)
        self.layerComboManagerWH.setFilters(QgsMapLayerProxyModel.RasterLayer)
        self.layerComboManagerWH.setFixedWidth(175)
        self.layerComboManagerWH.setCurrentIndex(-1)
        self.layerComboManagerWA = QgsMapLayerComboBox(self.dlg.widgetWallAspect)
        self.layerComboManagerWA.setFilters(QgsMapLayerProxyModel.RasterLayer)
        self.layerComboManagerWA.setFixedWidth(175)
        self.layerComboManagerWA.setCurrentIndex(-1)

    # noinspection PyMethodMayBeStatic
    def tr(self, message):
        """Get the translation for a string using Qt translation API.

        We implement this ourselves since we do not inherit QObject.

        :param message: String for translation.
        :type message: str, QString

        :returns: Translated version of message.
        :rtype: QString
        """
        # noinspection PyTypeChecker,PyArgumentList,PyCallByClass
        return QCoreApplication.translate('ShadowGenerator', message)

    def add_action(
        self,
        icon_path,
        text,
        callback,
        enabled_flag=True,
        add_to_menu=True,
        add_to_toolbar=True,
        status_tip=None,
        whats_this=None,
        parent=None):

        """Add a toolbar icon to the toolbar.

        :param icon_path: Path to the icon for this action. Can be a resource
            path (e.g. ':/plugins/foo/bar.png') or a normal file system path.
        :type icon_path: str

        :param text: Text that should be shown in menu items for this action.
        :type text: str

        :param callback: Function to be called when the action is triggered.
        :type callback: function

        :param enabled_flag: A flag indicating if the action should be enabled
            by default. Defaults to True.
        :type enabled_flag: bool

        :param add_to_menu: Flag indicating whether the action should also
            be added to the menu. Defaults to True.
        :type add_to_menu: bool

        :param add_to_toolbar: Flag indicating whether the action should also
            be added to the toolbar. Defaults to True.
        :type add_to_toolbar: bool

        :param status_tip: Optional text to show in a popup when mouse pointer
            hovers over the action.
        :type status_tip: str

        :param parent: Parent widget for the new action. Defaults None.
        :type parent: QWidget

        :param whats_this: Optional text to show in the status bar when the
            mouse pointer hovers over the action.

        :returns: The action that was created. Note that the action is also
            added to self.actions list.
        :rtype: QAction
        """

        icon = QIcon(icon_path)
        action = QAction(icon, text, parent)
        action.triggered.connect(callback)
        action.setEnabled(enabled_flag)

        if status_tip is not None:
            action.setStatusTip(status_tip)

        if whats_this is not None:
            action.setWhatsThis(whats_this)

        if add_to_toolbar:
            self.toolbar.addAction(action)

        if add_to_menu:
            self.iface.addPluginToMenu(
                self.menu,
                action)

        self.actions.append(action)

        return action

    def initGui(self):
        """Create the menu entries and toolbar icons inside the QGIS GUI."""

        icon_path = ':/plugins/ShadowGenerator/ShadowIcon.png'
        self.add_action(
            icon_path,
            text=self.tr(u'Shadow Generator'),
            callback=self.run,
            parent=self.iface.mainWindow())

    def unload(self):
        """Removes the plugin menu item and icon from QGIS GUI."""
        for action in self.actions:
            self.iface.removePluginMenu(
                self.tr(u'&Shadow Generator'),
                action)
            self.iface.removeToolBarIcon(action)

    def checkbox_changed(self):
        if self.dlg.shadowCheckBox.isChecked():
            self.dlg.timeEdit.setEnabled(True)
        else:
            self.dlg.timeEdit.setEnabled(False)

    def start_progress(self):

        if self.dlg.checkBoxDST.isChecked():
            dst = 1
        else:
            dst = 0
        
        ProjectPath=QgsProject.instance().absolutePath()
        folderPath = os.path.join(ProjectPath,'Step_3')
        self.dlg.textOutput.setText(folderPath)
        dsmlayer = self.layerComboManagerDSM.currentLayer()

        if dsmlayer is None:
            QMessageBox.critical(None, "Error", "No valid ground and building DSM raster layer is selected")
            return

        provider = dsmlayer.dataProvider()
        filepath_dsm = str(provider.dataSourceUri())

        gdal_dsm = gdal.Open(filepath_dsm)
        dsm = gdal_dsm.ReadAsArray().astype(np.float64)

        # response to issue #85
        nd = gdal_dsm.GetRasterBand(1).GetNoDataValue()
        dsm[dsm == nd] = 0.
        if dsm.min() < 0:
            dsm = dsm + np.abs(dsm.min())

        sizex = dsm.shape[0]
        sizey = dsm.shape[1]

        old_cs = osr.SpatialReference()
        dsm_ref = dsmlayer.crs().toWkt()
        old_cs.ImportFromWkt(dsm_ref)

        wgs84_wkt = """
        GEOGCS["WGS 84",
            DATUM["WGS_1984",
                SPHEROID["WGS 84",6378137,298.257223563,
                    AUTHORITY["EPSG","7030"]],
                AUTHORITY["EPSG","6326"]],
            PRIMEM["Greenwich",0,
                AUTHORITY["EPSG","8901"]],
            UNIT["degree",0.01745329251994328,
                AUTHORITY["EPSG","9122"]],
            AUTHORITY["EPSG","4326"]]"""

        new_cs = osr.SpatialReference()
        new_cs.ImportFromWkt(wgs84_wkt)

        transform = osr.CoordinateTransformation(old_cs, new_cs)

        width = gdal_dsm.RasterXSize
        height = gdal_dsm.RasterYSize
        gt = gdal_dsm.GetGeoTransform()
        minx = gt[0]
        miny = gt[3] + width*gt[4] + height*gt[5]
        lonlat = transform.TransformPoint(minx, miny)
        geotransform = gdal_dsm.GetGeoTransform()
        scale = 1 / geotransform[1]
        
        gdalver = float(gdal.__version__[0])
        if gdalver >= 3.:
            lon = lonlat[1] #changed to gdal 3
            lat = lonlat[0] #changed to gdal 3
        else:
            lon = lonlat[0] #changed to gdal 2
            lat = lonlat[1] #changed to gdal 2
        # print('lon:' + str(lon))
        # print('lat:' + str(lat))

        trans = self.dlg.spinBoxTrans.value() / 100.0

        if self.dlg.checkBoxUseVeg.isChecked():

            usevegdem = 1

            vegdsm = self.layerComboManagerVEGDSM.currentLayer()
            if vegdsm is None:
                QMessageBox.critical(None, "Error", "No valid vegetation DSM selected")
                return

            # load raster
            gdal.AllRegister()
            provider = vegdsm.dataProvider()
            filePathOld = str(provider.dataSourceUri())
            dataSet = gdal.Open(filePathOld)
            vegdsm = dataSet.ReadAsArray().astype(np.float64)

            vegsizex = vegdsm.shape[0]
            vegsizey = vegdsm.shape[1]

            if not (vegsizex == sizex) & (vegsizey == sizey):
                QMessageBox.critical(None, "Error", "All grids must be of same extent and resolution")
                return

            if self.dlg.checkBoxTrunkExist.isChecked():
                vegdsm2 = self.layerComboManagerVEGDSM2.currentLayer()

                if vegdsm2 is None:
                    QMessageBox.critical(None, "Error", "No valid trunk zone DSM selected")
                    return

                # load raster
                gdal.AllRegister()
                provider = vegdsm2.dataProvider()
                filePathOld = str(provider.dataSourceUri())
                dataSet = gdal.Open(filePathOld)
                vegdsm2 = dataSet.ReadAsArray().astype(np.float64)
            else:
                trunkratio = self.dlg.spinBoxTrunkHeight.value() / 100.0
                vegdsm2 = vegdsm * trunkratio

            vegsizex = vegdsm2.shape[0]
            vegsizey = vegdsm2.shape[1]

            if not (vegsizex == sizex) & (vegsizey == sizey):  # &
                QMessageBox.critical(None, "Error", "All grids must be of same extent and resolution")
                return
        else:
            vegdsm = 0
            vegdsm2 = 0
            usevegdem = 0

        if self.dlg.checkBoxWallsh.isChecked():
            wallsh = 1
            # wall height layer
            whlayer = self.layerComboManagerWH.currentLayer()
            if whlayer is None:
                    QMessageBox.critical(None, "Error", "No valid wall height raster layer is selected")
                    return
            provider = whlayer.dataProvider()
            filepath_wh= str(provider.dataSourceUri())
            self.gdal_wh = gdal.Open(filepath_wh)
            wheight = self.gdal_wh.ReadAsArray().astype(np.float64)
            vhsizex = wheight.shape[0]
            vhsizey = wheight.shape[1]
            if not (vhsizex == sizex) & (vhsizey == sizey):  # &
                QMessageBox.critical(None, "Error", "All grids must be of same extent and resolution")
                return

            # wall aspectlayer
            walayer = self.layerComboManagerWA.currentLayer()
            if walayer is None:
                    QMessageBox.critical(None, "Error", "No valid wall aspect raster layer is selected")
                    return
            provider = walayer.dataProvider()
            filepath_wa= str(provider.dataSourceUri())
            self.gdal_wa = gdal.Open(filepath_wa)
            waspect = self.gdal_wa.ReadAsArray().astype(np.float64)
            vasizex = waspect.shape[0]
            vasizey = waspect.shape[1]
            if not (vasizex == sizex) & (vasizey == sizey):
                QMessageBox.critical(None, "Error", "All grids must be of same extent and resolution")
                return
        else:
            wallsh = 0
            wheight = 0
            waspect = 0

        if folderPath is 'None':
            QMessageBox.critical(None, "Error", "No selected folder")
            return
        else:
            date = self.dlg.calendarWidget.selectedDate()
            year = date.year()
            month = date.month()
            day = date.day()
            UTC = self.dlg.spinBoxUTC.value()
            if self.dlg.shadowCheckBox.isChecked():
                onetime = 1
                time = self.dlg.timeEdit.time()
                hour = time.hour()
                minu = time.minute()
                sec = time.second()
            else:
                onetime = 0
                hour = 0
                minu = 0
                sec = 0

            tv = [year, month, day, hour, minu, sec]
            intervalTime = self.dlg.intervalTimeEdit.time()
            self.timeInterval = intervalTime.minute() + (intervalTime.hour() * 60) + (intervalTime.second()/60)
            shadowresult = dsh.dailyshading(dsm, vegdsm, vegdsm2, scale, lon, lat, sizex, sizey, tv, UTC, usevegdem,
                                       self.timeInterval, onetime, self.dlg, folderPath, gdal_dsm, trans, 
                                       dst, wallsh, wheight, waspect)

            shfinal = shadowresult["shfinal"]
            time_vector = shadowresult["time_vector"]

            if onetime == 0:
                timestr = time_vector.strftime("%Y%m%d")
                savestr = 'shadow_fraction_on_'
            else:
                timestr = time_vector.strftime("%Y%m%d_%H%M")
                savestr = 'Shadow_at_'

        filename = os.path.join(folderPath, savestr + timestr + '.tif')

        dsh.saveraster(gdal_dsm, filename, shfinal)

        #QMessageBox.information(None, "ShadowGenerator", "Shadow grid(s) successfully generated")
        self.iface.messageBar().pushMessage("ShadowGenerator", "Shadow grid(s) successfully generated")

        # load result into canvas
        if self.dlg.checkBoxIntoCanvas.isChecked():
            rlayer = self.iface.addRasterLayer(filename)

            # Set opacity
            rlayer.renderer().setOpacity(0.5)

            # Trigger a repaint
            if hasattr(rlayer, "setCacheImage"):
                rlayer.setCacheImage(None)
            rlayer.triggerRepaint()

    def run(self):
        """Run method that performs all the real work"""
        # show the dialog
        self.dlg.show()
        # Run the dialog event loop
        self.dlg.exec_()

    def help(self):
        url = "https://umep-docs.readthedocs.io/en/latest/processor/Solar%20Radiation%20Daily%20Shadow%20Pattern.html"
        webbrowser.open_new_tab(url)

