#!/usr/bin/env python
import sys
import traceback
import os
from os.path import join
import importlib

# local imports
from code_evaluator import CodeEvaluator, TimeoutException


class PythonCodeEvaluator(CodeEvaluator):
    """Tests the Python code obtained from Code Server"""

    # def check_code(self, test, user_answer, ref_code_path):
    def check_code(self, user_answer, test_cases):
        success = False

        try:
            tb = None
            submitted = compile(user_answer, '<string>', mode='exec')
            g = {}
            exec submitted in g
            for test_code in test_cases:
                _tests = compile(test_code, '<string>', mode='exec')
                exec _tests in g
        except AssertionError:
            type, value, tb = sys.exc_info()
            info = traceback.extract_tb(tb)
            fname, lineno, func, text = info[-1]
            text = str(test_code).splitlines()[lineno-1]
            err = "{0} {1} in: {2}".format(type.__name__, str(value), text)
        except TimeoutException:
            raise
        except Exception:
            err = traceback.format_exc(limit=0)
        else:
            success = True
            err = 'Correct answer'

        del tb
        return success, err

    # def unpack_test_case_data(self, test_case_data):
    #     test_cases = []
    #     for t in test_case_data:
    #         test_case = t.get('test_case')
    #         test_cases.append(test_case)

    #     return test_cases

    # def check_code(self):
    #     success = False

    #     try:
    #         tb = None
    #         test_code = self._create_test_case()
    #         submitted = compile(self.user_answer, '<string>', mode='exec')
    #         g = {}
    #         exec submitted in g
    #         _tests = compile(test_code, '<string>', mode='exec')
    #         exec _tests in g
    #     except AssertionError:
    #         type, value, tb = sys.exc_info()
    #         info = traceback.extract_tb(tb)
    #         fname, lineno, func, text = info[-1]
    #         text = str(test_code).splitlines()[lineno-1]
    #         err = "{0} {1} in: {2}".format(type.__name__, str(value), text)
    #     else:
    #         success = True
    #         err = 'Correct answer'

    #     del tb
    #     return success, err

    # def _create_test_case(self):
    #     """
    #         Create assert based test cases in python
    #     """
    #     test_code = ""
    #     if self.test:
    #         return self.test
    #     elif self.test_case_data:
    #         for test_case in self.test_case_data:
    #             pos_args = ", ".join(str(i) for i in test_case.get('pos_args')) \
    #                                 if test_case.get('pos_args') else ""
    #             kw_args = ", ".join(str(k+"="+a) for k, a
    #                              in test_case.get('kw_args').iteritems()) \
    #                             if test_case.get('kw_args') else ""
    #             args = pos_args + ", " + kw_args if pos_args and kw_args \
    #                                                 else pos_args or kw_args
    #             function_name = test_case.get('func_name')
    #             expected_answer = test_case.get('expected_answer')

    #             tcode = "assert {0}({1}) == {2}".format(function_name, args,
    #                                          expected_answer)
    #             test_code += tcode + "\n"
    #         return test_code