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#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#
#      http://www.apache.org/licenses/LICENSE-2.0
#
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"""Tests for Constants object and cosntants.json file."""

from __future__ import absolute_import  # pylint: disable=import-only-modules
from __future__ import unicode_literals  # pylint: disable=import-only-modules

import os

import constants
from core.tests import test_utils
import feconf
import python_utils


class ConstantsTests(test_utils.GenericTestBase):

    def test_constants_file_is_existing(self):
        """Test if the constants file is existing."""
        self.assertTrue(os.path.isfile(os.path.join(
            'assets', 'constants.ts')))

    def test_constants_file_contains_valid_json(self):
        """Test if the constants file is valid json file."""
        with python_utils.open_file(
            os.path.join('assets', 'constants.ts'), 'r') as f:
            json = constants.parse_json_from_js(f)
            self.assertTrue(isinstance(json, dict))
            self.assertEqual(json['TESTING_CONSTANT'], 'test')

    def test_difficulty_values_are_matched(self):
        """Tests that the difficulty values and strings are matched in the
        various constants.
        """
        self.assertEqual(
            constants.constants.SKILL_DIFFICULTIES, [
                constants.constants.SKILL_DIFFICULTY_EASY,
                constants.constants.SKILL_DIFFICULTY_MEDIUM,
                constants.constants.SKILL_DIFFICULTY_HARD])
        self.assertItemsEqual(
            list(constants.constants.SKILL_DIFFICULTY_LABEL_TO_FLOAT.keys()),
            constants.constants.SKILL_DIFFICULTIES)
        self.assertEqual(
            constants.constants.DEFAULT_SKILL_DIFFICULTY,
            constants.constants.SKILL_DIFFICULTY_LABEL_TO_FLOAT[
                constants.constants.SKILL_DIFFICULTY_EASY])

    def test_constants_and_feconf_are_consistent(self):
        """Test if constants that are related are consistent between feconf and
        constants.js.
        """
        self.assertIn(
            feconf.MIGRATION_BOT_USER_ID, constants.constants.SYSTEM_USER_IDS)
        self.assertIn(
            feconf.SYSTEM_COMMITTER_ID, constants.constants.SYSTEM_USER_IDS)
        self.assertEqual(len(constants.constants.SYSTEM_USER_IDS), 2)

    def test_all_comments_are_removed_from_json_text(self):
        """Tests if comments are removed from json text."""
        dummy_constants_filepath = os.path.join(
            feconf.TESTS_DATA_DIR, 'dummy_constants.js')
        with python_utils.open_file(dummy_constants_filepath, 'r') as f:
            actual_text_without_comments = constants.remove_comments(f.read())
            expected_text_without_comments = (
                'var dummy_constants = {\n'
                '  "File_purpose": "This file is for testing comments '
                'removal",\n\n'
                '  "Dummy_constant": "Simple constant",\n\n'
                '  "Dummy_list_constant": ["List", "of", "dummy", '
                '"constants"],\n\n'
                '  "Dummy_constant_without_comment": '
                '"Dummy constant with no comment"\n'
                '};\n')

            self.assertEqual(
                actual_text_without_comments, expected_text_without_comments)