"""
***************************************************************************
    gdalcalc.py
    ---------------------
    Date                 : Janaury 2015
    Copyright            : (C) 2015 by Giovanni Manghi
    Email                : giovanni dot manghi at naturalgis dot pt
***************************************************************************
*                                                                         *
*   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__ = "Giovanni Manghi"
__date__ = "January 2015"
__copyright__ = "(C) 2015, Giovanni Manghi"

from qgis.core import (
    QgsProcessingException,
    QgsProcessingParameterDefinition,
    QgsProcessingParameterRasterLayer,
    QgsProcessingParameterBand,
    QgsProcessingParameterNumber,
    QgsProcessingParameterEnum,
    QgsProcessingParameterExtent,
    QgsProcessingParameterString,
    QgsProcessingParameterRasterDestination,
)
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.algs.gdal.GdalUtils import GdalUtils

from processing.tools.system import isWindows


class gdalcalc(GdalAlgorithm):
    INPUT_A = "INPUT_A"
    INPUT_B = "INPUT_B"
    INPUT_C = "INPUT_C"
    INPUT_D = "INPUT_D"
    INPUT_E = "INPUT_E"
    INPUT_F = "INPUT_F"
    BAND_A = "BAND_A"
    BAND_B = "BAND_B"
    BAND_C = "BAND_C"
    BAND_D = "BAND_D"
    BAND_E = "BAND_E"
    BAND_F = "BAND_F"
    FORMULA = "FORMULA"
    # TODO QGIS 4.0 : Rename EXTENT_OPT to EXTENT
    EXTENT_OPT = "EXTENT_OPT"
    EXTENT_OPTIONS = ["ignore", "fail", "union", "intersect"]
    # TODO QGIS 4.0 : Rename EXTENT to PROJWIN or CUSTOM_EXTENT
    EXTENT = "PROJWIN"
    OUTPUT = "OUTPUT"
    NO_DATA = "NO_DATA"
    OPTIONS = "OPTIONS"
    EXTRA = "EXTRA"
    RTYPE = "RTYPE"

    TYPE = [
        "Byte",
        "Int16",
        "UInt16",
        "UInt32",
        "Int32",
        "Float32",
        "Float64",
        "CInt16",
        "CInt32",
        "CFloat32",
        "CFloat64",
        "Int8",
    ]

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

    def initAlgorithm(self, config=None):
        self.addParameter(
            QgsProcessingParameterRasterLayer(
                self.INPUT_A, self.tr("Input layer A"), optional=False
            )
        )
        self.addParameter(
            QgsProcessingParameterBand(
                self.BAND_A,
                self.tr("Number of raster band for A"),
                parentLayerParameterName=self.INPUT_A,
            )
        )
        self.addParameter(
            QgsProcessingParameterRasterLayer(
                self.INPUT_B, self.tr("Input layer B"), optional=True
            )
        )
        self.addParameter(
            QgsProcessingParameterBand(
                self.BAND_B,
                self.tr("Number of raster band for B"),
                parentLayerParameterName=self.INPUT_B,
                optional=True,
            )
        )
        self.addParameter(
            QgsProcessingParameterRasterLayer(
                self.INPUT_C, self.tr("Input layer C"), optional=True
            )
        )
        self.addParameter(
            QgsProcessingParameterBand(
                self.BAND_C,
                self.tr("Number of raster band for C"),
                parentLayerParameterName=self.INPUT_C,
                optional=True,
            )
        )
        self.addParameter(
            QgsProcessingParameterRasterLayer(
                self.INPUT_D, self.tr("Input layer D"), optional=True
            )
        )
        self.addParameter(
            QgsProcessingParameterBand(
                self.BAND_D,
                self.tr("Number of raster band for D"),
                parentLayerParameterName=self.INPUT_D,
                optional=True,
            )
        )
        self.addParameter(
            QgsProcessingParameterRasterLayer(
                self.INPUT_E, self.tr("Input layer E"), optional=True
            )
        )
        self.addParameter(
            QgsProcessingParameterBand(
                self.BAND_E,
                self.tr("Number of raster band for E"),
                parentLayerParameterName=self.INPUT_E,
                optional=True,
            )
        )
        self.addParameter(
            QgsProcessingParameterRasterLayer(
                self.INPUT_F, self.tr("Input layer F"), optional=True
            )
        )
        self.addParameter(
            QgsProcessingParameterBand(
                self.BAND_F,
                self.tr("Number of raster band for F"),
                parentLayerParameterName=self.INPUT_F,
                optional=True,
            )
        )
        self.addParameter(
            QgsProcessingParameterString(
                self.FORMULA,
                self.tr(
                    "Calculation in gdalnumeric syntax using +-/* or any numpy array functions (i.e. logical_and())"
                ),
                "A*2",
                optional=False,
            )
        )
        self.addParameter(
            QgsProcessingParameterNumber(
                self.NO_DATA,
                self.tr("Set output NoData value"),
                type=QgsProcessingParameterNumber.Type.Double,
                defaultValue=None,
                optional=True,
            )
        )

        if GdalUtils.version() >= 3030000:
            extent_opt_param = QgsProcessingParameterEnum(
                self.EXTENT_OPT,
                self.tr("Handling of extent differences"),
                options=[o.title() for o in self.EXTENT_OPTIONS],
                defaultValue=0,
            )
            extent_opt_param.setHelp(
                self.tr(
                    "This option determines how to handle rasters with different extents"
                )
            )
            self.addParameter(extent_opt_param)

        if GdalUtils.version() >= 3030000:
            extent_param = QgsProcessingParameterExtent(
                self.EXTENT, self.tr("Output extent"), optional=True
            )
            extent_param.setHelp(self.tr("Custom extent of the output raster"))
            self.addParameter(extent_param)

        self.addParameter(
            QgsProcessingParameterEnum(
                self.RTYPE,
                self.tr("Output raster type"),
                options=self.TYPE,
                defaultValue=5,
            )
        )

        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": {"widget_type": "rasteroptions"}})
        self.addParameter(options_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("Calculated"))
        )

    def name(self):
        return "rastercalculator"

    def displayName(self):
        return self.tr("Raster calculator")

    def group(self):
        return self.tr("Raster miscellaneous")

    def groupId(self):
        return "rastermiscellaneous"

    def commandName(self):
        return "gdal_calc"

    def getConsoleCommands(self, parameters, context, feedback, executing=True):

        out = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
        self.setOutputValue(self.OUTPUT, out)
        formula = self.parameterAsString(parameters, self.FORMULA, context)
        if self.NO_DATA in parameters and parameters[self.NO_DATA] is not None:
            noData = self.parameterAsDouble(parameters, self.NO_DATA, context)
        else:
            noData = None

        arguments = [
            "--overwrite",
            f'--calc "{formula}"',
            "--format",
            GdalUtils.getFormatShortNameFromFilename(out),
        ]

        rtype = self.parameterAsEnum(parameters, self.RTYPE, context)
        if (
            self.TYPE[rtype] in ["CInt16", "CInt32", "CFloat32", "CFloat64"]
            and GdalUtils.version() < 3050300
        ):
            raise QgsProcessingException(
                self.tr("{} data type requires GDAL version 3.5.3 or later").format(
                    self.TYPE[rtype]
                )
            )
        if self.TYPE[rtype] == "Int8" and GdalUtils.version() < 3070000:
            raise QgsProcessingException(
                self.tr("Int8 data type requires GDAL version 3.7 or later")
            )

        arguments.append("--type " + self.TYPE[rtype])

        if noData is not None:
            arguments.append("--NoDataValue")
            arguments.append(noData)
        layer_a = self.parameterAsRasterLayer(parameters, self.INPUT_A, context)
        if layer_a is None:
            raise QgsProcessingException(
                self.invalidRasterError(parameters, self.INPUT_A)
            )
        layer_a_details = GdalUtils.gdal_connection_details_from_layer(layer_a)

        def all_equal(iterator):
            iterator = iter(iterator)
            try:
                first = next(iterator)
            except StopIteration:
                return True
            return all(first == x for x in iterator)

        # Check GDAL version for projwin and extent options (GDAL 3.3 is required)
        if GdalUtils.version() < 3030000 and self.EXTENT in parameters.keys():
            raise QgsProcessingException(
                self.tr(
                    "The custom output extent option (--projwin) is only available on GDAL 3.3 or later"
                )
            )
        if GdalUtils.version() < 3030000 and self.EXTENT_OPT in parameters.keys():
            raise QgsProcessingException(
                self.tr(
                    "The output extent option (--extent) is only available on GDAL 3.3 or later"
                )
            )
        # --projwin and --extent option are mutually exclusive
        if (
            self.EXTENT in parameters.keys() and parameters[self.EXTENT] is not None
        ) and (
            self.EXTENT_OPT in parameters.keys() and parameters[self.EXTENT_OPT] != 0
        ):
            raise QgsProcessingException(
                self.tr(
                    "The custom output extent option (--projwin) and output extent option (--extent) are mutually exclusive"
                )
            )
        # If extent option is defined, pixel size and SRS of all input raster must be the same
        if self.EXTENT_OPT in parameters.keys() and parameters[self.EXTENT_OPT] != 0:
            pixel_size_X, pixel_size_Y, srs = [], [], []
            for input_layer in [
                self.INPUT_A,
                self.INPUT_B,
                self.INPUT_C,
                self.INPUT_D,
                self.INPUT_E,
                self.INPUT_F,
            ]:
                if input_layer in parameters and parameters[input_layer] is not None:
                    layer = self.parameterAsRasterLayer(
                        parameters, input_layer, context
                    )
                    pixel_size_X.append(layer.rasterUnitsPerPixelX())
                    pixel_size_Y.append(layer.rasterUnitsPerPixelY())
                    srs.append(layer.crs().authid())
            if not (
                all_equal(pixel_size_X) and all_equal(pixel_size_Y) and all_equal(srs)
            ):
                raise QgsProcessingException(
                    self.tr(
                        "For all output extent options, the pixel size (resolution) and SRS (Spatial Reference System) of all the input rasters must be the same"
                    )
                )

        extent = self.EXTENT_OPTIONS[
            self.parameterAsEnum(parameters, self.EXTENT_OPT, context)
        ]
        if extent != "ignore":
            arguments.append(f"--extent={extent}")

        bbox = self.parameterAsExtent(parameters, self.EXTENT, context, layer_a.crs())
        if not bbox.isNull():
            arguments.append("--projwin")
            arguments.append(str(bbox.xMinimum()))
            arguments.append(str(bbox.yMaximum()))
            arguments.append(str(bbox.xMaximum()))
            arguments.append(str(bbox.yMinimum()))

        arguments.append("-A")
        arguments.append(layer_a_details.connection_string)
        if self.parameterAsString(parameters, self.BAND_A, context):
            arguments.append(
                "--A_band " + self.parameterAsString(parameters, self.BAND_A, context)
            )

        if self.INPUT_B in parameters and parameters[self.INPUT_B] is not None:
            layer_b = self.parameterAsRasterLayer(parameters, self.INPUT_B, context)
            if layer_b is None:
                raise QgsProcessingException(
                    self.invalidRasterError(parameters, self.INPUT_B)
                )
            input_b_details = GdalUtils.gdal_connection_details_from_layer(layer_b)
            arguments.append("-B")
            arguments.append(input_b_details.connection_string)
            if self.parameterAsString(parameters, self.BAND_B, context):
                arguments.append(
                    "--B_band "
                    + self.parameterAsString(parameters, self.BAND_B, context)
                )

        if self.INPUT_C in parameters and parameters[self.INPUT_C] is not None:
            layer_c = self.parameterAsRasterLayer(parameters, self.INPUT_C, context)
            if layer_c is None:
                raise QgsProcessingException(
                    self.invalidRasterError(parameters, self.INPUT_C)
                )
            input_c_details = GdalUtils.gdal_connection_details_from_layer(layer_c)
            arguments.append("-C")
            arguments.append(input_c_details.connection_string)
            if self.parameterAsString(parameters, self.BAND_C, context):
                arguments.append(
                    "--C_band "
                    + self.parameterAsString(parameters, self.BAND_C, context)
                )

        if self.INPUT_D in parameters and parameters[self.INPUT_D] is not None:
            layer_d = self.parameterAsRasterLayer(parameters, self.INPUT_D, context)
            if layer_d is None:
                raise QgsProcessingException(
                    self.invalidRasterError(parameters, self.INPUT_D)
                )
            input_d_details = GdalUtils.gdal_connection_details_from_layer(layer_d)
            arguments.append("-D")
            arguments.append(input_d_details.connection_string)
            if self.parameterAsString(parameters, self.BAND_D, context):
                arguments.append(
                    "--D_band "
                    + self.parameterAsString(parameters, self.BAND_D, context)
                )

        if self.INPUT_E in parameters and parameters[self.INPUT_E] is not None:
            layer_e = self.parameterAsRasterLayer(parameters, self.INPUT_E, context)
            if layer_e is None:
                raise QgsProcessingException(
                    self.invalidRasterError(parameters, self.INPUT_E)
                )
            input_e_details = GdalUtils.gdal_connection_details_from_layer(layer_e)
            arguments.append("-E")
            arguments.append(input_e_details.connection_string)
            if self.parameterAsString(parameters, self.BAND_E, context):
                arguments.append(
                    "--E_band "
                    + self.parameterAsString(parameters, self.BAND_E, context)
                )

        if self.INPUT_F in parameters and parameters[self.INPUT_F] is not None:
            layer_f = self.parameterAsRasterLayer(parameters, self.INPUT_F, context)
            if layer_f is None:
                raise QgsProcessingException(
                    self.invalidRasterError(parameters, self.INPUT_F)
                )
            input_f_details = GdalUtils.gdal_connection_details_from_layer(layer_f)
            arguments.append("-F")
            arguments.append(input_f_details.connection_string)
            if self.parameterAsString(parameters, self.BAND_F, context):
                arguments.append(
                    "--F_band "
                    + self.parameterAsString(parameters, self.BAND_F, context)
                )

        options = self.parameterAsString(parameters, self.OPTIONS, context)
        if options:
            parts = options.split("|")
            for p in parts:
                arguments.append("--co " + p)

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

        arguments.append("--outfile")
        arguments.append(out)

        return [
            self.commandName() + (".bat" if isWindows() else ".py"),
            GdalUtils.escapeAndJoin(arguments),
        ]