"""
***************************************************************************
    self.py
    ---------------------
    Date                 : August 2012
    Copyright            : (C) 2012 by Victor Olaya
    Email                : volayaf at gmail dot com
***************************************************************************
*                                                                         *
*   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.                                   *
*                                                                         *
***************************************************************************
"""

__author__ = 'Victor Olaya'
__date__ = 'August 2012'
__copyright__ = '(C) 2012, Victor Olaya'

import os

from qgis.PyQt.QtGui import QIcon
from qgis.core import (QgsRasterFileWriter,
                       QgsProcessingException,
                       QgsProcessingParameterDefinition,
                       QgsProcessingParameterRasterLayer,
                       QgsProcessingParameterCrs,
                       QgsProcessingParameterNumber,
                       QgsProcessingParameterEnum,
                       QgsProcessingParameterBoolean,
                       QgsProcessingParameterExtent,
                       QgsProcessingParameterString,
                       QgsProcessingParameterRasterDestination,
                       )
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.algs.gdal.GdalUtils import GdalUtils

pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]


class warp(GdalAlgorithm):

    INPUT = 'INPUT'
    SOURCE_CRS = 'SOURCE_CRS'
    TARGET_CRS = 'TARGET_CRS'
    NODATA = 'NODATA'
    TARGET_RESOLUTION = 'TARGET_RESOLUTION'
    OPTIONS = 'OPTIONS'
    RESAMPLING = 'RESAMPLING'
    DATA_TYPE = 'DATA_TYPE'
    TARGET_EXTENT = 'TARGET_EXTENT'
    TARGET_EXTENT_CRS = 'TARGET_EXTENT_CRS'
    MULTITHREADING = 'MULTITHREADING'
    EXTRA = 'EXTRA'
    OUTPUT = 'OUTPUT'

    def __init__(self):
        super().__init__()

    def initAlgorithm(self, config=None):
        self.methods = ((self.tr('Nearest Neighbour'), 'near'),
                        (self.tr('Bilinear (2x2 Kernel)'), 'bilinear'),
                        (self.tr('Cubic (4x4 Kernel)'), 'cubic'),
                        (self.tr('Cubic B-Spline (4x4 Kernel)'), 'cubicspline'),
                        (self.tr('Lanczos (6x6 Kernel)'), 'lanczos'),
                        (self.tr('Average'), 'average'),
                        (self.tr('Mode'), 'mode'),
                        (self.tr('Maximum'), 'max'),
                        (self.tr('Minimum'), 'min'),
                        (self.tr('Median'), 'med'),
                        (self.tr('First Quartile (Q1)'), 'q1'),
                        (self.tr('Third Quartile (Q3)'), 'q3'))

        self.TYPES = [self.tr('Use Input Layer Data Type'), 'Byte', 'Int16', 'UInt16', 'UInt32', 'Int32', 'Float32', 'Float64', 'CInt16', 'CInt32', 'CFloat32', 'CFloat64', 'Int8']

        self.addParameter(QgsProcessingParameterRasterLayer(self.INPUT, self.tr('Input layer')))
        self.addParameter(QgsProcessingParameterCrs(self.SOURCE_CRS,
                                                    self.tr('Source CRS'),
                                                    optional=True))
        self.addParameter(QgsProcessingParameterCrs(self.TARGET_CRS,
                                                    self.tr('Target CRS'),
                                                    optional=True))
        self.addParameter(QgsProcessingParameterEnum(self.RESAMPLING,
                                                     self.tr('Resampling method to use'),
                                                     options=[i[0] for i in self.methods],
                                                     defaultValue=0))
        self.addParameter(QgsProcessingParameterNumber(self.NODATA,
                                                       self.tr('Nodata value for output bands'),
                                                       type=QgsProcessingParameterNumber.Type.Double,
                                                       defaultValue=None,
                                                       optional=True))
        self.addParameter(QgsProcessingParameterNumber(self.TARGET_RESOLUTION,
                                                       self.tr('Output file resolution in target georeferenced units'),
                                                       type=QgsProcessingParameterNumber.Type.Double,
                                                       minValue=0.0,
                                                       defaultValue=None,
                                                       optional=True))

        options_param = QgsProcessingParameterString(self.OPTIONS,
                                                     self.tr('Additional creation options'),
                                                     defaultValue='',
                                                     optional=True)
        options_param.setFlags(options_param.flags() | QgsProcessingParameterDefinition.Flag.FlagAdvanced)
        options_param.setMetadata({
            'widget_wrapper': {
                'class': 'processing.algs.gdal.ui.RasterOptionsWidget.RasterOptionsWidgetWrapper'}})
        self.addParameter(options_param)

        dataType_param = QgsProcessingParameterEnum(self.DATA_TYPE,
                                                    self.tr('Output data type'),
                                                    self.TYPES,
                                                    allowMultiple=False,
                                                    defaultValue=0)
        dataType_param.setFlags(dataType_param.flags() | QgsProcessingParameterDefinition.Flag.FlagAdvanced)
        self.addParameter(dataType_param)

        target_extent_param = QgsProcessingParameterExtent(self.TARGET_EXTENT,
                                                           self.tr('Georeferenced extents of output file to be created'),
                                                           optional=True)
        target_extent_param.setFlags(target_extent_param.flags() | QgsProcessingParameterDefinition.Flag.FlagAdvanced)
        self.addParameter(target_extent_param)

        target_extent_crs_param = QgsProcessingParameterCrs(self.TARGET_EXTENT_CRS,
                                                            self.tr('CRS of the target raster extent'),
                                                            optional=True)
        target_extent_crs_param.setFlags(target_extent_crs_param.flags() | QgsProcessingParameterDefinition.Flag.FlagAdvanced)
        self.addParameter(target_extent_crs_param)

        multithreading_param = QgsProcessingParameterBoolean(self.MULTITHREADING,
                                                             self.tr('Use multithreaded warping implementation'),
                                                             defaultValue=False)
        multithreading_param.setFlags(multithreading_param.flags() | QgsProcessingParameterDefinition.Flag.FlagAdvanced)
        self.addParameter(multithreading_param)

        extra_param = QgsProcessingParameterString(self.EXTRA,
                                                   self.tr('Additional command-line parameters'),
                                                   defaultValue=None,
                                                   optional=True)
        extra_param.setFlags(extra_param.flags() | QgsProcessingParameterDefinition.Flag.FlagAdvanced)
        self.addParameter(extra_param)

        self.addParameter(QgsProcessingParameterRasterDestination(self.OUTPUT,
                                                                  self.tr('Reprojected')))

    def name(self):
        return 'warpreproject'

    def displayName(self):
        return self.tr('Warp (reproject)')

    def group(self):
        return self.tr('Raster projections')

    def groupId(self):
        return 'rasterprojections'

    def icon(self):
        return QIcon(os.path.join(pluginPath, 'images', 'gdaltools', 'warp.png'))

    def commandName(self):
        return 'gdalwarp'

    def tags(self):
        tags = self.tr('transform,reproject,crs,srs,resample').split(',')
        tags.extend(super().tags())
        return tags

    def getConsoleCommands(self, parameters, context, feedback, executing=True):
        inLayer = self.parameterAsRasterLayer(parameters, self.INPUT, context)
        if inLayer is None:
            raise QgsProcessingException(self.invalidRasterError(parameters, self.INPUT))
        input_details = GdalUtils.gdal_connection_details_from_layer(
            inLayer)

        sourceCrs = self.parameterAsCrs(parameters, self.SOURCE_CRS, context)
        targetCrs = self.parameterAsCrs(parameters, self.TARGET_CRS, context)
        if self.NODATA in parameters and parameters[self.NODATA] is not None:
            nodata = self.parameterAsDouble(parameters, self.NODATA, context)
        else:
            nodata = None
        resolution = self.parameterAsDouble(parameters, self.TARGET_RESOLUTION, context)

        arguments = ['-overwrite']
        if sourceCrs.isValid():
            arguments.append('-s_srs')
            arguments.append(GdalUtils.gdal_crs_string(sourceCrs))

        if targetCrs.isValid():
            arguments.append('-t_srs')
            arguments.append(GdalUtils.gdal_crs_string(targetCrs))

        if nodata is not None:
            arguments.append('-dstnodata')
            arguments.append(str(nodata))

        if resolution:
            arguments.append('-tr')
            arguments.append(str(resolution))
            arguments.append(str(resolution))

        arguments.append('-r')
        arguments.append(self.methods[self.parameterAsEnum(parameters, self.RESAMPLING, context)][1])

        extent = self.parameterAsExtent(parameters, self.TARGET_EXTENT, context)
        if not extent.isNull():
            arguments.append('-te')
            arguments.append(extent.xMinimum())
            arguments.append(extent.yMinimum())
            arguments.append(extent.xMaximum())
            arguments.append(extent.yMaximum())

            extentCrs = self.parameterAsCrs(parameters, self.TARGET_EXTENT_CRS, context)
            if extentCrs.isValid():
                arguments.append('-te_srs')
                arguments.append(GdalUtils.gdal_crs_string(extentCrs))

        if self.parameterAsBoolean(parameters, self.MULTITHREADING, context):
            arguments.append('-multi')

        data_type = self.parameterAsEnum(parameters, self.DATA_TYPE, context)
        if data_type:
            if self.TYPES[data_type] == 'Int8' and GdalUtils.version() < 3070000:
                raise QgsProcessingException(self.tr('Int8 data type requires GDAL version 3.7 or later'))

            arguments.append('-ot ' + self.TYPES[data_type])

        out = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
        self.setOutputValue(self.OUTPUT, out)

        output_format = QgsRasterFileWriter.driverForExtension(os.path.splitext(out)[1])
        if not output_format:
            raise QgsProcessingException(self.tr('Output format is invalid'))

        arguments.append('-of')
        arguments.append(output_format)

        options = self.parameterAsString(parameters, self.OPTIONS, context)
        if options:
            arguments.extend(GdalUtils.parseCreationOptions(options))

        if self.EXTRA in parameters and parameters[self.EXTRA] not in (None, ''):
            extra = self.parameterAsString(parameters, self.EXTRA, context)
            arguments.append(extra)

        arguments.append(input_details.connection_string)
        arguments.append(out)

        if input_details.open_options:
            arguments.extend(input_details.open_options_as_arguments())

        return [self.commandName(), GdalUtils.escapeAndJoin(arguments)]
