"""
***************************************************************************
    hillshade.py
    ---------------------
    Date                 : October 2013
    Copyright            : (C) 2013 by Alexander Bruy
    Email                : alexander dot bruy 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__ = "Alexander Bruy"
__date__ = "October 2013"
__copyright__ = "(C) 2013, Alexander Bruy"

import os

from qgis.core import (
    QgsRasterFileWriter,
    QgsProcessingException,
    QgsProcessingParameterDefinition,
    QgsProcessingParameterRasterLayer,
    QgsProcessingParameterBand,
    QgsProcessingParameterBoolean,
    QgsProcessingParameterNumber,
    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 hillshade(GdalAlgorithm):
    INPUT = "INPUT"
    BAND = "BAND"
    COMPUTE_EDGES = "COMPUTE_EDGES"
    ZEVENBERGEN = "ZEVENBERGEN"
    Z_FACTOR = "Z_FACTOR"
    SCALE = "SCALE"
    AZIMUTH = "AZIMUTH"
    ALTITUDE = "ALTITUDE"
    COMBINED = "COMBINED"
    MULTIDIRECTIONAL = "MULTIDIRECTIONAL"
    OPTIONS = "OPTIONS"
    CREATION_OPTIONS = "CREATION_OPTIONS"
    EXTRA = "EXTRA"
    OUTPUT = "OUTPUT"

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

    def initAlgorithm(self, config=None):
        self.addParameter(
            QgsProcessingParameterRasterLayer(self.INPUT, self.tr("Input layer"))
        )
        self.addParameter(
            QgsProcessingParameterBand(
                self.BAND,
                self.tr("Band number"),
                1,
                parentLayerParameterName=self.INPUT,
            )
        )
        self.addParameter(
            QgsProcessingParameterNumber(
                self.Z_FACTOR,
                self.tr("Z factor (vertical exaggeration)"),
                type=QgsProcessingParameterNumber.Type.Double,
                minValue=0.0,
                defaultValue=1.0,
            )
        )
        self.addParameter(
            QgsProcessingParameterNumber(
                self.SCALE,
                self.tr("Scale (ratio of vertical units to horizontal)"),
                type=QgsProcessingParameterNumber.Type.Double,
                minValue=0.0,
                defaultValue=1.0,
            )
        )
        self.addParameter(
            QgsProcessingParameterNumber(
                self.AZIMUTH,
                self.tr("Azimuth of the light"),
                type=QgsProcessingParameterNumber.Type.Double,
                minValue=0.0,
                maxValue=360,
                defaultValue=315.0,
            )
        )
        self.addParameter(
            QgsProcessingParameterNumber(
                self.ALTITUDE,
                self.tr("Altitude of the light"),
                type=QgsProcessingParameterNumber.Type.Double,
                minValue=0.0,
                defaultValue=45.0,
            )
        )
        self.addParameter(
            QgsProcessingParameterBoolean(
                self.COMPUTE_EDGES, self.tr("Compute edges"), defaultValue=False
            )
        )
        self.addParameter(
            QgsProcessingParameterBoolean(
                self.ZEVENBERGEN,
                self.tr("Use Zevenbergen&Thorne formula instead of the Horn's one"),
                defaultValue=False,
            )
        )
        self.addParameter(
            QgsProcessingParameterBoolean(
                self.COMBINED, self.tr("Combined shading"), defaultValue=False
            )
        )
        self.addParameter(
            QgsProcessingParameterBoolean(
                self.MULTIDIRECTIONAL,
                self.tr("Multidirectional shading"),
                defaultValue=False,
            )
        )

        # backwards compatibility parameter
        # TODO QGIS 4: remove parameter and related logic
        options_param = QgsProcessingParameterString(
            self.OPTIONS,
            self.tr("Additional creation options"),
            defaultValue="",
            optional=True,
        )
        options_param.setFlags(
            options_param.flags() | QgsProcessingParameterDefinition.Flag.Hidden
        )
        options_param.setMetadata({"widget_wrapper": {"widget_type": "rasteroptions"}})
        self.addParameter(options_param)

        creation_options_param = QgsProcessingParameterString(
            self.CREATION_OPTIONS,
            self.tr("Additional creation options"),
            defaultValue="",
            optional=True,
        )
        creation_options_param.setFlags(
            creation_options_param.flags()
            | QgsProcessingParameterDefinition.Flag.FlagAdvanced
        )
        creation_options_param.setMetadata(
            {"widget_wrapper": {"widget_type": "rasteroptions"}}
        )
        self.addParameter(creation_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("Hillshade"))
        )

    def name(self):
        return "hillshade"

    def displayName(self):
        return self.tr("Hillshade")

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

    def groupId(self):
        return "rasteranalysis"

    def commandName(self):
        return "gdaldem"

    def getConsoleCommands(self, parameters, context, feedback, executing=True):
        arguments = ["hillshade"]
        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)

        arguments.append(input_details.connection_string)

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

        arguments.append("-b")
        arguments.append(str(self.parameterAsInt(parameters, self.BAND, context)))
        arguments.append("-z")
        arguments.append(
            str(self.parameterAsDouble(parameters, self.Z_FACTOR, context))
        )
        arguments.append("-s")
        arguments.append(str(self.parameterAsDouble(parameters, self.SCALE, context)))

        multidirectional = self.parameterAsBoolean(
            parameters, self.MULTIDIRECTIONAL, context
        )
        # azimuth and multidirectional are mutually exclusive
        if not multidirectional:
            arguments.append("-az")
            arguments.append(
                str(self.parameterAsDouble(parameters, self.AZIMUTH, context))
            )

        arguments.append("-alt")
        arguments.append(
            str(self.parameterAsDouble(parameters, self.ALTITUDE, context))
        )

        if self.parameterAsBoolean(parameters, self.COMPUTE_EDGES, context):
            arguments.append("-compute_edges")

        if self.parameterAsBoolean(parameters, self.ZEVENBERGEN, context):
            arguments.append("-alg")
            arguments.append("ZevenbergenThorne")

        combined = self.parameterAsBoolean(parameters, self.COMBINED, context)
        if combined and not multidirectional:
            arguments.append("-combined")
        elif multidirectional and not combined:
            arguments.append("-multidirectional")
        elif multidirectional and combined:
            raise QgsProcessingException(
                self.tr("Options -multirectional and -combined are mutually exclusive.")
            )

        options = self.parameterAsString(parameters, self.CREATION_OPTIONS, context)
        # handle backwards compatibility parameter OPTIONS
        if self.OPTIONS in parameters and parameters[self.OPTIONS] not in (None, ""):
            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)

        if input_details.credential_options:
            arguments.extend(input_details.credential_options_as_arguments())

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