# -*- 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.core.GeoAlgorithm import GeoAlgorithm

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

from processing.outputs.OutputVector import OutputVector

from processing.gdal.GdalUtils import GdalUtils

class contour(GeoAlgorithm):

    INPUT_RASTER = "INPUT_RASTER"
    OUTPUT_VECTOR = "OUTPUT_VECTOR"
    INTERVAL = "INTERVAL"
    FIELD_NAME = "FIELD_NAME"
    EXTRA = "EXTRA"

    def getIcon(self):
        filepath = os.path.dirname(__file__) + "/icons/contour.png"
        return QtGui.QIcon(filepath)

    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 provided, no elecation attribute is attached)", "ELEV", optional=True))
        self.addParameter(ParameterString(self.EXTRA, "Additional creation parameters", ""))

        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)