"""
    Pygments SQL lexers tests
    ~~~~~~~~~~~~~~~~~~~~~~~~~

    :copyright: Copyright 2006-present by the Pygments team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""

import pytest

from pygments.lexers.sql import name_between_bracket_re, \
    name_between_backtick_re, tsql_go_re, tsql_declare_re, \
    tsql_variable_re, MySqlLexer, TransactSqlLexer

from pygments.token import Comment, Name, Number, Punctuation, Whitespace


@pytest.fixture(scope='module')
def lexer():
    yield TransactSqlLexer()


def _assert_are_tokens_of_type(lexer, examples, expected_token_type):
    for test_number, example in enumerate(examples.split(), 1):
        token_count = 0
        for token_type, token_value in lexer.get_tokens(example):
            if token_type != Whitespace:
                token_count += 1
                assert token_type == expected_token_type, \
                    'token_type #%d for %s is be %s but must be %s' % \
                    (test_number, token_value, token_type, expected_token_type)
        assert token_count == 1, \
            '%s must yield exactly 1 token instead of %d' % \
            (example, token_count)


def _assert_tokens_match(lexer, text, expected_tokens_without_trailing_newline):
    actual_tokens = tuple(lexer.get_tokens(text))
    if (len(actual_tokens) >= 1) and (actual_tokens[-1] == (Whitespace, '\n')):
        actual_tokens = tuple(actual_tokens[:-1])
    assert expected_tokens_without_trailing_newline == actual_tokens, \
        f'text must yield expected tokens: {text}'


def test_can_lex_float(lexer):
    _assert_are_tokens_of_type(lexer,
                               '1. 1.e1 .1 1.2 1.2e3 1.2e+3 1.2e-3 1e2',
                               Number.Float)
    _assert_tokens_match(lexer,
                         '1e2.1e2',
                         ((Number.Float, '1e2'), (Number.Float, '.1e2')))


def test_can_reject_almost_float(lexer):
    _assert_tokens_match(lexer, '.e1', ((Punctuation, '.'), (Name, 'e1')))


def test_can_lex_integer(lexer):
    _assert_are_tokens_of_type(lexer, '1 23 456', Number.Integer)


def test_can_lex_names(lexer):
    _assert_are_tokens_of_type(
        lexer,
        'thingy thingy123 _thingy _ _123 Ähnliches Müll #temp1 ##temp2',
        Name)


def test_can_lex_comments(lexer):
    _assert_tokens_match(lexer, '--\n', ((Comment.Single, '--\n'),))
    _assert_tokens_match(lexer, '/**/', (
        (Comment.Multiline, '/*'), (Comment.Multiline, '*/')
    ))
    _assert_tokens_match(lexer, '/*/**/*/', (
        (Comment.Multiline, '/*'),
        (Comment.Multiline, '/*'),
        (Comment.Multiline, '*/'),
        (Comment.Multiline, '*/'),
    ))


def test_can_match_analyze_text_res():
    assert ['`a`', '`bc`'] == \
        name_between_backtick_re.findall('select `a`, `bc` from some')
    assert ['[a]', '[bc]'] == \
        name_between_bracket_re.findall('select [a], [bc] from some')
    assert tsql_declare_re.search('--\nDeClaRe @some int;')
    assert tsql_go_re.search('select 1\ngo\n--')
    assert tsql_variable_re.search('create procedure dbo.usp_x @a int, @b int')


def test_can_analyze_text():
    mysql_lexer = MySqlLexer()
    tsql_lexer = TransactSqlLexer()
    code_to_expected_lexer_map = {
        'select `a`, `bc` from some': mysql_lexer,
        'select [a], [bc] from some': tsql_lexer,
        '-- `a`, `bc`\nselect [a], [bc] from some': tsql_lexer,
        '-- `a`, `bc`\nselect [a], [bc] from some; go': tsql_lexer,
    }
    sql_lexers = set(code_to_expected_lexer_map.values())
    for code, expected_lexer in code_to_expected_lexer_map.items():
        ratings_and_lexers = list((lexer.analyse_text(code), lexer.name) for lexer in sql_lexers)
        best_rating, best_lexer_name  = sorted(ratings_and_lexers, reverse=True)[0]
        expected_rating = expected_lexer.analyse_text(code)
        message = (
            f'lexer must be {expected_lexer.name} (rating {expected_rating:.2f}) instead of '
            f'{best_lexer_name} (rating {best_rating:.2f}) for analyse_text() on code:\n{code}')
        assert expected_lexer.name == best_lexer_name, message
