"""
***************************************************************************
    r_null.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 checkParameterValuesBeforeExecuting(alg, parameters, context):
    """Verify if we have the right parameters"""
    if alg.parameterAsString(parameters, "setnull", context) or alg.parameterAsString(
        parameters, "null", context
    ):
        return True, None

    return False, alg.tr(
        "You need to set at least 'setnull' or 'null' parameters for this algorithm!"
    )


def processInputs(alg, parameters, context, feedback):
    """Prepare the GRASS import commands"""
    if "map" in alg.exportedLayers:
        return

    # We need to import without r.external
    alg.loadRasterLayerFromParameter("map", parameters, context, False)
    alg.postInputs(context)


def processCommand(alg, parameters, context, feedback):
    # We temporary remove the output 'sequence'
    alg.processCommand(parameters, context, feedback, True)


def processOutputs(alg, parameters, context, feedback):
    fileName = alg.parameterAsOutputLayer(parameters, "output", context)
    grassName = alg.exportedLayers["map"]
    alg.exportRasterLayer(grassName, fileName, False)