# -*- coding: utf-8 -*-

"""
***************************************************************************
    slope.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'

# This will get replaced with a git SHA1 when you do a git archive

__revision__ = '$Format:%H$'


from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.core.parameters import ParameterRaster
from processing.core.parameters import ParameterBoolean
from processing.core.parameters import ParameterNumber
from processing.core.outputs import OutputRaster
from processing.algs.gdal.GdalUtils import GdalUtils


class slope(GdalAlgorithm):

    INPUT = 'INPUT'
    BAND = 'BAND'
    COMPUTE_EDGES = 'COMPUTE_EDGES'
    ZEVENBERGEN = 'ZEVENBERGEN'
    AS_PERCENT = 'AS_PERCENT'
    SCALE = 'SCALE'
    OUTPUT = 'OUTPUT'

    def defineCharacteristics(self):
        self.name, self.i18n_name = self.trAlgorithm('Slope')
        self.group, self.i18n_group = self.trAlgorithm('[GDAL] Analysis')
        self.addParameter(ParameterRaster(self.INPUT, self.tr('Input layer')))
        self.addParameter(ParameterNumber(self.BAND,
                                          self.tr('Band number'), 1, 99, 1))
        self.addParameter(ParameterBoolean(self.COMPUTE_EDGES,
                                           self.tr('Compute edges'), False))
        self.addParameter(ParameterBoolean(self.ZEVENBERGEN,
                                           self.tr("Use Zevenbergen&Thorne formula (instead of the Horn's one)"),
                                           False))
        self.addParameter(ParameterBoolean(self.AS_PERCENT,
                                           self.tr('Slope expressed as percent (instead of degrees)'), False))
        self.addParameter(ParameterNumber(self.SCALE,
                                          self.tr('Scale (ratio of vert. units to horiz.)'),
                                          0.0, 99999999.999999, 1.0))

        self.addOutput(OutputRaster(self.OUTPUT, self.tr('Slope')))

    def getConsoleCommands(self):
        arguments = ['slope']
        arguments.append(unicode(self.getParameterValue(self.INPUT)))
        output = unicode(self.getOutputValue(self.OUTPUT))
        arguments.append(output)

        arguments.append('-of')
        arguments.append(GdalUtils.getFormatShortNameFromFilename(output))

        arguments.append('-b')
        arguments.append(unicode(self.getParameterValue(self.BAND)))
        arguments.append('-s')
        arguments.append(unicode(self.getParameterValue(self.SCALE)))

        if self.getParameterValue(self.COMPUTE_EDGES):
            arguments.append('-compute_edges')

        if self.getParameterValue(self.ZEVENBERGEN):
            arguments.append('-alg')
            arguments.append('ZevenbergenThorne')

        if self.getParameterValue(self.AS_PERCENT):
            arguments.append('-p')

        return ['gdaldem', GdalUtils.escapeAndJoin(arguments)]