import unittest

class DiffObjectTests(unittest.TestCase):
    def _getTarget(self, *args):
        from diffobject import DiffObject
        return DiffObject

    def _makeOne(self, *args, **kwargs):
        return self._getTarget()(*args,**kwargs)

    def test_as_fakeobject_in_not_changed(self):
        from collections import namedtuple
        User = namedtuple("User", "name password")

        user = User(name = "name", password = "password")
        target = self._makeOne(user, fields=["name", "password"])

        self.assertEquals(user.name, str(target.name))
        self.assertEquals(user.password, str(target.password))

    def test_as_fakeobject_in_changed(self):
        from collections import namedtuple
        User = namedtuple("User", "name password")

        user = User(name = "name", password = "password")
        target = self._makeOne(user, fields=["name", "password"])

        target.name = "updated-name-whooo-heee"

        self.assertEquals("updated-name-whooo-heee", str(target.name))
        self.assertEquals(user.password, str(target.password))

    def test_checking_field_is_updated(self):
        from collections import namedtuple
        User = namedtuple("User", "name password")

        user = User(name = "name", password = "password")
        target = self._makeOne(user, fields=["name", "password"])

        self.assertFalse(target.name.changed)
        self.assertFalse(target.password.changed)

        target.name = "updated-name-whooo-heee"

        self.assertTrue(target.name.changed)
        self.assertFalse(target.password.changed)

    def test_rollback(self):
        from collections import namedtuple
        User = namedtuple("User", "name password")

        user = User(name = "name", password = "password")
        target = self._makeOne(user, fields=["name", "password"])

        target.name = "updated-name-whooo-heee"
        self.assertEquals("updated-name-whooo-heee", str(target.name))

        target.name.rollback()
        self.assertEquals(user.name, str(target.name))

    def test_act_as_targeted_instance_method(self):
        class User(object):
            def __init__(self, name):
                self.name = name

            def say(self, mes):
                return "%s: %s" % (self.name, mes)

        user = User("Bob")
        target = self._makeOne(user, fields=["name"])

        self.assertEquals(user.say(""), target.say(""))

        target.name = "AAA"
        self.assertEquals("AAA: hello", target.say("hello"))

    def test_act_as_targeted_instance_property(self):
        class User(object):
            def __init__(self, name):
                self.name = name

            @property
            def double(self):
                return "%s: %s" % (self.name, self.name)

        user = User("Bob")
        target = self._makeOne(user, fields=["name"])

        self.assertEquals(user.double, target.double)

        target.name = "AAA"
        self.assertEquals("AAA: AAA", target.double)


if __name__ == "__main__":
    unittest.main()