import sextante
import unittest
from sextante.tests.TestData import points, points2, polygons, polygons2, lines, union,\
    table, polygonsGeoJson
    table, polygonsGeoJson, raster
from sextante.core.QGisLayers import QGisLayers
from sextante.core.SextanteUtils import SextanteUtils
from osgeo.gdalconst import GA_ReadOnly
import os
from osgeo import gdal

class SagaTest(unittest.TestCase):
    '''tests for saga algorithms'''

    def test_sagametricconversions(self):
        outputs=sextante.runalg("saga:metricconversions",raster(),0,None)
        output=outputs['CONV']
        self.assertTrue(os.path.isfile(output))
        dataset=gdal.Open(output, GA_ReadOnly)
        strhash=hash(str(dataset.ReadAsArray(0).tolist()))
        self.assertEqual(strhash,-2137931723)
    
    def test_sagasortgrid(self):
        outputs=sextante.runalg("saga:sortgrid",raster(),True,None)
        output=outputs['OUTPUT']
        self.assertTrue(os.path.isfile(output))
        dataset=gdal.Open(output, GA_ReadOnly)
        strhash=hash(str(dataset.ReadAsArray(0).tolist()))
        self.assertEqual(strhash,1320073153)

    '''the following tests are not meant to test the algorithms themselves, 
    but the algorithm provider, testing things such as the file conversion, 
    the selection awareness of SAGA process, etc'''

    def test_SagaVectorAlgorithmWithSelection(self):
        layer = sextante.getobject(polygons2());
        feature = layer.getFeatures().next()
        selected = [feature.id()]
        layer.setSelectedFeatures(selected)
        outputs=sextante.runalg("saga:polygoncentroids",polygons2(),True,None)
        output=outputs['CENTROIDS']
        layer=QGisLayers.getObjectFromUri(output, True)
        fields=layer.pendingFields()
        expectednames=['ID','POLY_NUM_B','POLY_ST_B']
        expectedtypes=['Real','Real','String']
        names=[str(f.name()) for f in fields]
        types=[str(f.typeName()) for f in fields]
        self.assertEqual(expectednames, names)
        self.assertEqual(expectedtypes, types)
        features=sextante.getfeatures(layer)
        self.assertEqual(1, len(features))
        feature=features.next()
        attrs=feature.attributes()
        expectedvalues=["2","1","string a"]
        values=[str(attr.toString()) for attr in attrs]
        self.assertEqual(expectedvalues, values)
        wkt='POINT(270820.58189697 4458968.73298999)'
        self.assertEqual(wkt, str(feature.geometry().exportToWkt()))

    def test_SagaVectorAlgorithWithUnsupportedInputAndOutputFormat(self):
        '''this tests both the exporting to shp and then the format change in the output layer'''
        layer = sextante.getobject(polygonsGeoJson());
        feature = layer.getFeatures().next()
        selected = [feature.id()]
        layer.setSelectedFeatures(selected)
        outputs=sextante.runalg("saga:polygoncentroids",polygonsGeoJson(),True, SextanteUtils.getTempFilename("geojson"))
        output=outputs['CENTROIDS']
        layer=QGisLayers.getObjectFromUri(output, True)
        fields=layer.pendingFields()
        expectednames=['ID','POLY_NUM_A','POLY_ST_A']
        expectedtypes=['Real','Real','String']
        names=[str(f.name()) for f in fields]
        types=[str(f.typeName()) for f in fields]
        self.assertEqual(expectednames, names)
        self.assertEqual(expectedtypes, types)
        features=sextante.getfeatures(layer)
        self.assertEqual(1, len(features))
        feature=features.next()
        attrs=feature.attributes()
        expectedvalues=["0","1.1","string a"]
        values=[str(attr.toString()) for attr in attrs]
        self.assertEqual(expectedvalues, values)
        wkt='POINT(270787.49991451 4458955.46775295)'
        self.assertEqual(wkt, str(feature.geometry().exportToWkt()))
    def test_SagaRasterAlgorithmWithUnsupportedOutputFormat(self):
        outputs=sextante.runalg("saga:convergenceindex",raster(),0,0,None)
        output=outputs['RESULT']
        self.assertTrue(os.path.isfile(output))
        dataset=gdal.Open(output, GA_ReadOnly)
        strhash=hash(str(dataset.ReadAsArray(0).tolist()))
        self.assertEqual(strhash,485390137)






def suite():
    suite = unittest.makeSuite(SagaTest, 'test')
    return suite

def runtests():
    result = unittest.TestResult()
    testsuite = suite()
    testsuite.run(result)
    return result