import unittest
from typing import List

from mypy.test.helpers import assert_string_arrays_equal

from mypyc.codegen.emit import Emitter, EmitterContext, ReturnHandler
from mypyc.codegen.emitwrapper import generate_arg_check
from mypyc.ir.rtypes import list_rprimitive, int_rprimitive
from mypyc.namegen import NameGenerator


class TestArgCheck(unittest.TestCase):
    def setUp(self) -> None:
        self.context = EmitterContext(NameGenerator([['mod']]))

    def test_check_list(self) -> None:
        emitter = Emitter(self.context)
        generate_arg_check('x', list_rprimitive, emitter, ReturnHandler('NULL'))
        lines = emitter.fragments
        self.assert_lines([
            'PyObject *arg_x;',
            'if (likely(PyList_Check(obj_x)))',
            '    arg_x = obj_x;',
            'else {',
            '    CPy_TypeError("list", obj_x);',
            '    return NULL;',
            '}',
        ], lines)

    def test_check_int(self) -> None:
        emitter = Emitter(self.context)
        generate_arg_check('x', int_rprimitive, emitter, ReturnHandler('NULL'))
        generate_arg_check('y', int_rprimitive, emitter, ReturnHandler('NULL'), optional=True)
        lines = emitter.fragments
        self.assert_lines([
            'CPyTagged arg_x;',
            'if (likely(PyLong_Check(obj_x)))',
            '    arg_x = CPyTagged_BorrowFromObject(obj_x);',
            'else {',
            '    CPy_TypeError("int", obj_x); return NULL;',
            '}',
            'CPyTagged arg_y;',
            'if (obj_y == NULL) {',
            '    arg_y = CPY_INT_TAG;',
            '} else if (likely(PyLong_Check(obj_y)))',
            '    arg_y = CPyTagged_BorrowFromObject(obj_y);',
            'else {',
            '    CPy_TypeError("int", obj_y); return NULL;',
            '}',
        ], lines)

    def assert_lines(self, expected: List[str], actual: List[str]) -> None:
        actual = [line.rstrip('\n') for line in actual]
        assert_string_arrays_equal(expected, actual, 'Invalid output')