"""
***************************************************************************
    retile.py
    ---------------------
    Date                 : January 2016
    Copyright            : (C) 2016 by Médéric Ribreux
    Email                : mederic dot ribreux at medspx dot fr
***************************************************************************
*                                                                         *
*   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__ = "Médéric Ribreux"
__date__ = "January 2016"
__copyright__ = "(C) 2016, Médéric Ribreux"

from qgis.core import (
    QgsProcessing,
    QgsProcessingException,
    QgsProcessingParameterDefinition,
    QgsProcessingParameterMultipleLayers,
    QgsProcessingParameterCrs,
    QgsProcessingParameterEnum,
    QgsProcessingParameterString,
    QgsProcessingParameterNumber,
    QgsProcessingParameterBoolean,
    QgsProcessingParameterFileDestination,
    QgsProcessingParameterFolderDestination,
)
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.algs.gdal.GdalUtils import GdalUtils
from processing.tools.system import isWindows


class retile(GdalAlgorithm):
    INPUT = "INPUT"
    TILE_SIZE_X = "TILE_SIZE_X"
    TILE_SIZE_Y = "TILE_SIZE_Y"
    OVERLAP = "OVERLAP"
    LEVELS = "LEVELS"

    SOURCE_CRS = "SOURCE_CRS"
    FORMAT = "FORMAT"
    RESAMPLING = "RESAMPLING"
    OPTIONS = "OPTIONS"
    CREATION_OPTIONS = "CREATION_OPTIONS"
    EXTRA = "EXTRA"
    DATA_TYPE = "DATA_TYPE"
    DELIMITER = "DELIMITER"
    ONLY_PYRAMIDS = "ONLY_PYRAMIDS"
    DIR_FOR_ROW = "DIR_FOR_ROW"
    OUTPUT = "OUTPUT"
    OUTPUT_CSV = "OUTPUT_CSV"

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

    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.addParameter(
            QgsProcessingParameterMultipleLayers(
                self.INPUT, self.tr("Input files"), QgsProcessing.SourceType.TypeRaster
            )
        )
        self.addParameter(
            QgsProcessingParameterNumber(
                self.TILE_SIZE_X,
                self.tr("Tile width"),
                type=QgsProcessingParameterNumber.Type.Integer,
                minValue=0,
                defaultValue=256,
            )
        )
        self.addParameter(
            QgsProcessingParameterNumber(
                self.TILE_SIZE_Y,
                self.tr("Tile height"),
                type=QgsProcessingParameterNumber.Type.Integer,
                minValue=0,
                defaultValue=256,
            )
        )
        self.addParameter(
            QgsProcessingParameterNumber(
                self.OVERLAP,
                self.tr("Overlap in pixels between consecutive tiles"),
                type=QgsProcessingParameterNumber.Type.Integer,
                minValue=0,
                defaultValue=0,
            )
        )
        self.addParameter(
            QgsProcessingParameterNumber(
                self.LEVELS,
                self.tr("Number of pyramids levels to build"),
                type=QgsProcessingParameterNumber.Type.Integer,
                minValue=0,
                defaultValue=1,
            )
        )

        params = [
            QgsProcessingParameterCrs(
                self.SOURCE_CRS,
                self.tr("Source coordinate reference system"),
                optional=True,
            ),
            QgsProcessingParameterEnum(
                self.RESAMPLING,
                self.tr("Resampling method"),
                options=[i[0] for i in self.methods],
                allowMultiple=False,
                defaultValue=0,
            ),
            QgsProcessingParameterString(
                self.DELIMITER,
                self.tr("Column delimiter used in the CSV file"),
                defaultValue=";",
                optional=True,
            ),
        ]

        # 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)

        params.append(
            QgsProcessingParameterString(
                self.EXTRA,
                self.tr("Additional command-line parameters"),
                defaultValue=None,
                optional=True,
            )
        )

        params.append(
            QgsProcessingParameterEnum(
                self.DATA_TYPE,
                self.tr("Output data type"),
                self.TYPES,
                allowMultiple=False,
                defaultValue=5,
            )
        )

        params.append(
            QgsProcessingParameterBoolean(
                self.ONLY_PYRAMIDS,
                self.tr("Build only the pyramids"),
                defaultValue=False,
            )
        )
        params.append(
            QgsProcessingParameterBoolean(
                self.DIR_FOR_ROW,
                self.tr("Use separate directory for each tiles row"),
                defaultValue=False,
            )
        )

        for param in params:
            param.setFlags(
                param.flags() | QgsProcessingParameterDefinition.Flag.FlagAdvanced
            )
            self.addParameter(param)

        self.addParameter(
            QgsProcessingParameterFolderDestination(
                self.OUTPUT, self.tr("Output directory")
            )
        )

        output_csv_param = QgsProcessingParameterFileDestination(
            self.OUTPUT_CSV,
            self.tr("CSV file containing the tile(s) georeferencing information"),
            "CSV files (*.csv)",
            optional=True,
        )
        output_csv_param.setCreateByDefault(False)
        self.addParameter(output_csv_param)

    def name(self):
        return "retile"

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

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

    def groupId(self):
        return "rastermiscellaneous"

    def commandName(self):
        return "gdal_retile"

    def getConsoleCommands(self, parameters, context, feedback, executing=True):
        arguments = [
            "-ps",
            str(self.parameterAsInt(parameters, self.TILE_SIZE_X, context)),
            str(self.parameterAsInt(parameters, self.TILE_SIZE_Y, context)),
            "-overlap",
            str(self.parameterAsInt(parameters, self.OVERLAP, context)),
            "-levels",
            str(self.parameterAsInt(parameters, self.LEVELS, context)),
        ]

        crs = self.parameterAsCrs(parameters, self.SOURCE_CRS, context)
        if crs.isValid():
            arguments.append("-s_srs")
            arguments.append(GdalUtils.gdal_crs_string(crs))

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

        data_type = self.parameterAsEnum(parameters, self.DATA_TYPE, context)
        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])

        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 self.parameterAsBoolean(parameters, self.DIR_FOR_ROW, context):
            arguments.append("-useDirForEachRow")

        if self.parameterAsBoolean(parameters, self.ONLY_PYRAMIDS, context):
            arguments.append("-pyramidOnly")

        csvFile = self.parameterAsFileOutput(parameters, self.OUTPUT_CSV, context)
        if csvFile:
            arguments.append("-csv")
            arguments.append(csvFile)
            delimiter = self.parameterAsString(parameters, self.DELIMITER, context)
            if delimiter:
                arguments.append("-csvDelim")
                arguments.append(delimiter)

        arguments.append("-targetDir")
        arguments.append(self.parameterAsString(parameters, self.OUTPUT, context))

        input_layers = self.parameterAsLayerList(parameters, self.INPUT, context)
        layers = []
        credential_options = []
        for layer in input_layers:
            layer_details = GdalUtils.gdal_connection_details_from_layer(layer)
            layers.append(layer_details.connection_string)

            if layer_details.credential_options:
                credential_options.extend(
                    layer_details.credential_options_as_arguments()
                )
        arguments.extend(layers)
        arguments.extend(credential_options)

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