import unittest

from Cython.Compiler import Code, UtilityCode


def strip_2tup(tup):
    return tup[0] and tup[0].strip(), tup[1] and tup[1].strip()

class TestUtilityLoader(unittest.TestCase):
    """
    Test loading UtilityCodes
    """

    expected = "test {{loader}} prototype", "test {{loader}} impl"

    required = "req {{loader}} proto", "req {{loader}} impl"

    context = dict(loader='Loader')

    name = "TestUtilityLoader"
    filename = "TestUtilityLoader.c"
    cls = Code.UtilityCode

    def test_load_as_string(self):
        got = strip_2tup(self.cls.load_as_string(self.name))
        self.assertEqual(got, self.expected)

        got = strip_2tup(self.cls.load_as_string(self.name, self.filename))
        self.assertEqual(got, self.expected)

    def test_load(self):
        utility = self.cls.load(self.name)
        got = strip_2tup((utility.proto, utility.impl))
        self.assertEqual(got, self.expected)

        required, = utility.requires
        got = strip_2tup((required.proto, required.impl))
        self.assertEqual(got, self.required)

        utility = self.cls.load(self.name, from_file=self.filename)
        got = strip_2tup((utility.proto, utility.impl))
        self.assertEqual(got, self.expected)

        utility = self.cls.load_cached(self.name, from_file=self.filename)
        got = strip_2tup((utility.proto, utility.impl))
        self.assertEqual(got, self.expected)


class TestTempitaUtilityLoader(TestUtilityLoader):
    """
    Test loading UtilityCodes with Tempita substitution
    """
    expected_tempita = (TestUtilityLoader.expected[0].replace('{{loader}}', 'Loader'),
                        TestUtilityLoader.expected[1].replace('{{loader}}', 'Loader'))

    required_tempita = (TestUtilityLoader.required[0].replace('{{loader}}', 'Loader'),
                        TestUtilityLoader.required[1].replace('{{loader}}', 'Loader'))

    cls = Code.TempitaUtilityCode

    def test_load_as_string(self):
        got = strip_2tup(self.cls.load_as_string(self.name, context=self.context))
        self.assertEqual(got, self.expected_tempita)

    def test_load(self):
        utility = self.cls.load(self.name, context=self.context)
        got = strip_2tup((utility.proto, utility.impl))
        self.assertEqual(got, self.expected_tempita)

        required, = utility.requires
        got = strip_2tup((required.proto, required.impl))
        self.assertEqual(got, self.required_tempita)

        utility = self.cls.load(self.name, from_file=self.filename, context=self.context)
        got = strip_2tup((utility.proto, utility.impl))
        self.assertEqual(got, self.expected_tempita)


class TestCythonUtilityLoader(TestTempitaUtilityLoader):
    """
    Test loading CythonUtilityCodes
    """

    # Just change the attributes and run the same tests
    expected = None, "test {{cy_loader}} impl"
    expected_tempita = None, "test CyLoader impl"

    required = None, "req {{cy_loader}} impl"
    required_tempita = None, "req CyLoader impl"

    context = dict(cy_loader='CyLoader')

    name = "TestCyUtilityLoader"
    filename = "TestCyUtilityLoader.pyx"
    cls = UtilityCode.CythonUtilityCode

    # Small hack to pass our tests above
    cls.proto = None

    test_load = TestUtilityLoader.test_load
    test_load_tempita = TestTempitaUtilityLoader.test_load