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

"""
***************************************************************************
    extractprojection.py
    ---------------------
    Date                 : September 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__ = '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 osgeo import gdal, osr
from PyQt4.QtGui import *

from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.parameters.ParameterRaster import ParameterRaster
from processing.parameters.ParameterBoolean import ParameterBoolean


class ExtractProjection(GeoAlgorithm):

    INPUT = "INPUT"
    PRJ_FILE = "PRJ_FILE"

    def getIcon(self):
        return QIcon(os.path.dirname(__file__) + "/icons/projection-export.png")

    def defineCharacteristics(self):
        self.name = "Extract projection"
        self.group = "[GDAL] Projections"
        self.addParameter(ParameterRaster(self.INPUT, "Input file"))
        self.addParameter(ParameterBoolean(self.PRJ_FILE, "Create also .prj file", False))

    def processAlgorithm(self, progress):
        rasterPath = self.getParameterValue(self.INPUT)
        createPrj = self.getParameterValue(self.PRJ_FILE)

        raster = gdal.Open(unicode(rasterPath))
        crs = raster.GetProjection()
        geotransform = raster.GetGeoTransform()
        raster = None

        outFileName = os.path.splitext(unicode(rasterPath))[0]

        if crs != "" and createPrj:
            tmp = osr.SpatialReference()
            tmp.ImportFromWkt( crs )
            tmp.MorphToESRI()
            crs = tmp.ExportToWkt()
            tmp = None

            prj = open(outFileName + '.prj', 'wt')
            prj.write( crs )
            prj.close()

        wld = open(outFileName + '.wld', 'wt')
        wld.write("%0.8f\n" % geotransform[1])
        wld.write("%0.8f\n" % geotransform[4])
        wld.write("%0.8f\n" % geotransform[2])
        wld.write("%0.8f\n" % geotransform[5])
        wld.write("%0.8f\n" % (geotransform[0] + 0.5 * geotransform[1] + 0.5 * geotransform[2]))
        wld.write("%0.8f\n" % (geotransform[3] + 0.5 * geotransform[4] + 0.5 * geotransform[5]))
        wld.close()