import unittest

from django.forms import ValidationError

from django.contrib.gis import forms

from django.contrib.gis.geos import GEOSGeometry

class GeometryFieldTest(unittest.TestCase):

    def test00_init(self):

        "Testing GeometryField initialization with defaults."

        fld = forms.GeometryField()

        for bad_default in ('blah', 3, 'FoO', None, 0):

            self.assertRaises(ValidationError, fld.clean, bad_default)

    def test01_srid(self):

        "Testing GeometryField with a SRID set."

        # Input that doesn't specify the SRID is assumed to be in the SRID

        # of the input field.

        fld = forms.GeometryField(srid=4326)

        geom = fld.clean('POINT(5 23)')

        self.assertEqual(4326, geom.srid)

        # Making the field in a different SRID from that of the geometry, and

        # asserting it transforms.

        fld = forms.GeometryField(srid=32140)

        tol = 0.0000001

        xform_geom = GEOSGeometry('POINT (951640.547328465 4219369.26171664)', srid=32140)

        # The cleaned geometry should be transformed to 32140.

        cleaned_geom = fld.clean('SRID=4326;POINT (-95.363151 29.763374)')

        self.failUnless(xform_geom.equals_exact(cleaned_geom, tol))

    def test02_null(self):

        "Testing GeometryField's handling of null (None) geometries."

        # Form fields, by default, are required (`required=True`)

        fld = forms.GeometryField()

        self.assertRaises(forms.ValidationError, fld.clean, None)

        # Still not allowed if `null=False`.

        fld = forms.GeometryField(required=False, null=False)

        self.assertRaises(forms.ValidationError, fld.clean, None)

        # This will clean None as a geometry (See #10660).

        fld = forms.GeometryField(required=False)

        self.assertEqual(None, fld.clean(None))

    def test03_geom_type(self):

        "Testing GeometryField's handling of different geometry types."

        # By default, all geometry types are allowed.

        fld = forms.GeometryField()

        for wkt in ('POINT(5 23)', 'MULTIPOLYGON(((0 0, 0 1, 1 1, 1 0, 0 0)))', 'LINESTRING(0 0, 1 1)'):

            self.assertEqual(GEOSGeometry(wkt), fld.clean(wkt))

        pnt_fld = forms.GeometryField(geom_type='POINT')

        self.assertEqual(GEOSGeometry('POINT(5 23)'), pnt_fld.clean('POINT(5 23)'))

        self.assertRaises(forms.ValidationError, pnt_fld.clean, 'LINESTRING(0 0, 1 1)')

def suite():

    s = unittest.TestSuite()

    s.addTest(unittest.makeSuite(GeometryFieldTest))

    return s

def run(verbosity=2):

    unittest.TextTestRunner(verbosity=verbosity).run(suite())

if __name__=="__main__":

    run()