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

"""
***************************************************************************
    contour.py
    ---------------------
    Date                 : September 2013
    Copyright            : (C) 2013 by Alexander Bruy
    Email                : alexander 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__ = 'September 2013'
__copyright__ = '(C) 2013, Alexander Bruy'

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

__revision__ = '$Format:%H$'

import os
from PyQt4 import QtGui
from qgis.core import *

from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm

from processing.core.parameters import ParameterRaster
from processing.core.parameters import ParameterNumber
from processing.core.parameters import ParameterString

from processing.core.outputs import OutputVector

from processing.algs.gdal.GdalUtils import GdalUtils


class contour(GdalAlgorithm):

    INPUT_RASTER = 'INPUT_RASTER'
    OUTPUT_VECTOR = 'OUTPUT_VECTOR'
    INTERVAL = 'INTERVAL'
    FIELD_NAME = 'FIELD_NAME'
    EXTRA = 'EXTRA'

    def defineCharacteristics(self):
        self.name = 'Contour'
        self.group = '[GDAL] Extraction'
        self.addParameter(ParameterRaster(self.INPUT_RASTER, 'Input layer',
                          False))
        self.addParameter(ParameterNumber(self.INTERVAL,
                          'Interval between contour lines', 0.0,
                          99999999.999999, 10.0))
        self.addParameter(ParameterString(self.FIELD_NAME,
            'Attribute name (if not set, no elevation attribute is attached)',
            'ELEV', optional=True))
        self.addParameter(ParameterString(self.EXTRA,
                          'Additional creation parameters', '', optional=True))

        self.addOutput(OutputVector(self.OUTPUT_VECTOR,
                       'Output file for contour lines (vector)'))

    def processAlgorithm(self, progress):
        interval = str(self.getParameterValue(self.INTERVAL))
        fieldName = str(self.getParameterValue(self.FIELD_NAME))
        extra = str(self.getParameterValue(self.EXTRA))

        arguments = []
        if len(fieldName) > 0:
            arguments.append('-a')
            arguments.append(fieldName)
        arguments.append('-i')
        arguments.append(interval)

        if len(extra) > 0:
            arguments.append(extra)

        arguments.append(self.getParameterValue(self.INPUT_RASTER))
        arguments.append(self.getOutputValue(self.OUTPUT_VECTOR))

        GdalUtils.runGdal(['gdal_contour',
                          GdalUtils.escapeAndJoin(arguments)], progress)