"""
***************************************************************************
    r_rgb.py
    --------
    Date                 : February 2016
    Copyright            : (C) 2016 by Médéric Ribreux
    Email                : medspx 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__ = "February 2016"
__copyright__ = "(C) 2016, Médéric Ribreux"


def processInputs(alg, parameters, context, feedback):
    if "input" in alg.exportedLayers:
        return

    # We need to import all the bands and color tables of the input raster
    alg.loadRasterLayerFromParameter("input", parameters, context, False, None)
    alg.postInputs(context)


def processCommand(alg, parameters, context, feedback):
    # if the input raster is multiband: export each component directly
    rasterInput = alg.exportedLayers["input"]
    raster = alg.parameterAsRasterLayer(parameters, "input", context)
    for color in ["red", "green", "blue"]:
        alg.exportedLayers[color] = color + alg.uniqueSuffix

    # If the raster is not multiband, really do r.rgb
    if raster.bandCount() == 1:
        alg.commands.append(
            "  r.rgb input={} red={} green={} blue={} --overwrite".format(
                rasterInput,
                alg.exportedLayers["red"],
                alg.exportedLayers["green"],
                alg.exportedLayers["blue"],
            )
        )


def processOutputs(alg, parameters, context, feedback):
    raster = alg.parameterAsRasterLayer(parameters, "input", context)

    # if the raster was monoband, export from r.rgb
    for color in ["red", "green", "blue"]:
        fileName = alg.parameterAsOutputLayer(parameters, color, context)
        if raster.bandCount() == 1:
            grassName = f"{color}{alg.uniqueSuffix}"
        else:
            grassName = "{}.{}".format(alg.exportedLayers["input"], color)
        alg.exportRasterLayer(grassName, fileName, True)
