from PyQt4 import QtGui
from sextante.core.GeoAlgorithm import GeoAlgorithm
from sextante.parameters.ParameterRaster import ParameterRaster
import os
from sextante.gdal.GdalUtils import GdalUtils
from sextante.parameters.ParameterString import ParameterString
from sextante.outputs.OutputVector import OutputVector
from sextante.core.SextanteUtils import SextanteUtils

class polygonize(GeoAlgorithm):

    INPUT = "INPUT"
    OUTPUT = "OUTPUT"
    FIELD = "FIELD"

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

    def defineCharacteristics(self):
        self.name = "polygonize"
        self.group = "Conversion"
        self.addParameter(ParameterRaster(polygonize.INPUT, "Input layer", False))
        self.addParameter(ParameterString(polygonize.FIELD, "Output field name", "Value"))
        self.addOutput(OutputVector(polygonize.OUTPUT, "Output layer"))

    def processAlgorithm(self, progress):
        if SextanteUtils.isWindows():
            commands = ["cmd.exe", "/C ", "gdal_polygonize.bat"]
        else:
            commands = ["gdal_polygonize.py"]
        commands.append(self.getParameterValue(polygonize.INPUT))
        commands.append('-f')
        commands.append('"ESRI Shapefile"')
        commands.append(self.getOutputValue(polygonize.OUTPUT))
        commands.append(self.getParameterValue(polygonize.FIELD))
        
        GdalUtils.runGdal(commands, progress)
