"""

Distance and Area objects to allow for sensible and convienient calculation 

and conversions. Here are some tests.

"""

import unittest

from django.contrib.gis.measure import Distance, Area, D, A

class DistanceTest(unittest.TestCase):

    "Testing the Distance object"

    def testInit(self):

        "Testing initialisation from valid units"

        d = Distance(m=100)

        self.assertEqual(d.m, 100)

        d1, d2, d3 = D(m=100), D(meter=100), D(metre=100)

        for d in (d1, d2, d3):

            self.assertEqual(d.m, 100)

        d = D(nm=100)

        self.assertEqual(d.m, 185200)

        y1, y2, y3 = D(yd=100), D(yard=100), D(Yard=100)

        for d in (y1, y2, y3):

            self.assertEqual(d.yd, 100)

        mm1, mm2 = D(millimeter=1000), D(MiLLiMeTeR=1000)

        for d in (mm1, mm2):

            self.assertEqual(d.m, 1.0)

            self.assertEqual(d.mm, 1000.0)

    def testInitInvalid(self):

        "Testing initialisation from invalid units"

        self.assertRaises(AttributeError, D, banana=100)

    def testAccess(self):

        "Testing access in different units"

        d = D(m=100)

        self.assertEqual(d.km, 0.1)

        self.assertAlmostEqual(d.ft, 328.084, 3)

    def testAccessInvalid(self):

        "Testing access in invalid units"

        d = D(m=100)

        self.failIf(hasattr(d, 'banana'))

    def testAddition(self):

        "Test addition & subtraction"

        d1 = D(m=100)

        d2 = D(m=200)

        d3 = d1 + d2

        self.assertEqual(d3.m, 300)

        d3 += d1

        self.assertEqual(d3.m, 400)

        d4 = d1 - d2

        self.assertEqual(d4.m, -100)

        d4 -= d1

        self.assertEqual(d4.m, -200)

        try:

            d5 = d1 + 1

        except TypeError, e:

            pass

        else:

            self.fail('Distance + number should raise TypeError')

        try:

            d5 = d1 - 1

        except TypeError, e:

            pass

        else:

            self.fail('Distance - number should raise TypeError')

        try:

            d1 += 1

        except TypeError, e:

            pass

        else:

            self.fail('Distance += number should raise TypeError')

        try:

            d1 -= 1

        except TypeError, e:

            pass

        else:

            self.fail('Distance -= number should raise TypeError')

    def testMultiplication(self):

        "Test multiplication & division"

        d1 = D(m=100)

        d3 = d1 * 2

        self.assertEqual(d3.m, 200)

        d3 *= 5

        self.assertEqual(d3.m, 1000)

        d4 = d1 / 2

        self.assertEqual(d4.m, 50)

        d4 /= 5

        self.assertEqual(d4.m, 10)

        a5 = d1 * D(m=10)

        self.assert_(isinstance(a5, Area))

        self.assertEqual(a5.sq_m, 100*10)

        try:

            d1 *= D(m=1)

        except TypeError, e:

            pass

        else:

            self.fail('Distance *= Distance should raise TypeError')

        try:

            d5 = d1 / D(m=1)

        except TypeError, e:

            pass

        else:

            self.fail('Distance / Distance should raise TypeError')

        try:

            d1 /= D(m=1)

        except TypeError, e:

            pass

        else:

            self.fail('Distance /= Distance should raise TypeError')

    def testUnitConversions(self):

        "Testing default units during maths"

        d1 = D(m=100)

        d2 = D(km=1)

        d3 = d1 + d2

        self.assertEqual(d3._default_unit, 'm')

        d4 = d2 + d1

        self.assertEqual(d4._default_unit, 'km')

        d5 = d1 * 2

        self.assertEqual(d5._default_unit, 'm')

        d6 = d1 / 2

        self.assertEqual(d6._default_unit, 'm')

    def testComparisons(self):

        "Testing comparisons"

        d1 = D(m=100)

        d2 = D(km=1)

        d3 = D(km=0)

        self.assert_(d2 > d1)

        self.assert_(d1 == d1)

        self.assert_(d1 < d2)

        self.failIf(d3)

    def testUnitsStr(self):

        "Testing conversion to strings"

        d1 = D(m=100)

        d2 = D(km=3.5)

        self.assertEqual(str(d1), '100.0 m')

        self.assertEqual(str(d2), '3.5 km')

        self.assertEqual(repr(d1), 'Distance(m=100.0)')

        self.assertEqual(repr(d2), 'Distance(km=3.5)')

    def testUnitAttName(self):

        "Testing the `unit_attname` class method"

        unit_tuple = [('Yard', 'yd'), ('Nautical Mile', 'nm'), ('German legal metre', 'german_m'),

                      ('Indian yard', 'indian_yd'), ('Chain (Sears)', 'chain_sears'), ('Chain', 'chain')]

        for nm, att in unit_tuple:

            self.assertEqual(att, D.unit_attname(nm))

class AreaTest(unittest.TestCase):

    "Testing the Area object"

    def testInit(self):

        "Testing initialisation from valid units"

        a = Area(sq_m=100)

        self.assertEqual(a.sq_m, 100)

        a = A(sq_m=100)

        self.assertEqual(a.sq_m, 100)

        a = A(sq_mi=100)

        self.assertEqual(a.sq_m, 258998811.0336)

    def testInitInvaliA(self):

        "Testing initialisation from invalid units"

        self.assertRaises(AttributeError, A, banana=100)

    def testAccess(self):

        "Testing access in different units"

        a = A(sq_m=100)

        self.assertEqual(a.sq_km, 0.0001)

        self.assertAlmostEqual(a.sq_ft, 1076.391, 3)

    def testAccessInvaliA(self):

        "Testing access in invalid units"

        a = A(sq_m=100)

        self.failIf(hasattr(a, 'banana'))

    def testAddition(self):

        "Test addition & subtraction"

        a1 = A(sq_m=100)

        a2 = A(sq_m=200)

        a3 = a1 + a2

        self.assertEqual(a3.sq_m, 300)

        a3 += a1

        self.assertEqual(a3.sq_m, 400)

        a4 = a1 - a2

        self.assertEqual(a4.sq_m, -100)

        a4 -= a1

        self.assertEqual(a4.sq_m, -200)

        try:

            a5 = a1 + 1

        except TypeError, e:

            pass

        else:

            self.fail('Area + number should raise TypeError')

        try:

            a5 = a1 - 1

        except TypeError, e:

            pass

        else:

            self.fail('Area - number should raise TypeError')

        try:

            a1 += 1

        except TypeError, e:

            pass

        else:

            self.fail('Area += number should raise TypeError')

        try:

            a1 -= 1

        except TypeError, e:

            pass

        else:

            self.fail('Area -= number should raise TypeError')

    def testMultiplication(self):

        "Test multiplication & division"

        a1 = A(sq_m=100)

        a3 = a1 * 2

        self.assertEqual(a3.sq_m, 200)

        a3 *= 5

        self.assertEqual(a3.sq_m, 1000)

        a4 = a1 / 2

        self.assertEqual(a4.sq_m, 50)

        a4 /= 5

        self.assertEqual(a4.sq_m, 10)

        try:

            a5 = a1 * A(sq_m=1)

        except TypeError, e:

            pass

        else:

            self.fail('Area * Area should raise TypeError')

        try:

            a1 *= A(sq_m=1)

        except TypeError, e:

            pass

        else:

            self.fail('Area *= Area should raise TypeError')

        try:

            a5 = a1 / A(sq_m=1)

        except TypeError, e:

            pass

        else:

            self.fail('Area / Area should raise TypeError')

        try:

            a1 /= A(sq_m=1)

        except TypeError, e:

            pass

        else:

            self.fail('Area /= Area should raise TypeError')

    def testUnitConversions(self):

        "Testing default units during maths"

        a1 = A(sq_m=100)

        a2 = A(sq_km=1)

        a3 = a1 + a2

        self.assertEqual(a3._default_unit, 'sq_m')

        a4 = a2 + a1

        self.assertEqual(a4._default_unit, 'sq_km')

        a5 = a1 * 2

        self.assertEqual(a5._default_unit, 'sq_m')

        a6 = a1 / 2

        self.assertEqual(a6._default_unit, 'sq_m')

    def testComparisons(self):

        "Testing comparisons"

        a1 = A(sq_m=100)

        a2 = A(sq_km=1)

        a3 = A(sq_km=0)

        self.assert_(a2 > a1)

        self.assert_(a1 == a1)

        self.assert_(a1 < a2)

        self.failIf(a3)

    def testUnitsStr(self):

        "Testing conversion to strings"

        a1 = A(sq_m=100)

        a2 = A(sq_km=3.5)

        self.assertEqual(str(a1), '100.0 sq_m')

        self.assertEqual(str(a2), '3.5 sq_km')

        self.assertEqual(repr(a1), 'Area(sq_m=100.0)')

        self.assertEqual(repr(a2), 'Area(sq_km=3.5)')

def suite():

    s = unittest.TestSuite()

    s.addTest(unittest.makeSuite(DistanceTest))

    s.addTest(unittest.makeSuite(AreaTest))

    return s

def run(verbosity=2):

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

if __name__=="__main__":

    run()