# -*- coding: utf-8    # This file contains Unicode characters.

from io import StringIO
from textwrap import dedent

import pytest

from jedi._compatibility import u, is_py3, py_version
from jedi.parser.token import NAME, OP, NEWLINE, STRING, INDENT
from jedi.parser import ParserWithRecovery, load_grammar, tokenize


from ..helpers import unittest


class TokenTest(unittest.TestCase):
    def test_end_pos_one_line(self):
        parsed = ParserWithRecovery(load_grammar(), dedent(u('''
        def testit():
            a = "huhu"
        ''')))
        tok = parsed.module.subscopes[0].statements[0].children[2]
        assert tok.end_pos == (3, 14)

    def test_end_pos_multi_line(self):
        parsed = ParserWithRecovery(load_grammar(), dedent(u('''
        def testit():
            a = """huhu
        asdfasdf""" + "h"
        ''')))
        tok = parsed.module.subscopes[0].statements[0].children[2].children[0]
        assert tok.end_pos == (4, 11)

    def test_simple_no_whitespace(self):
        # Test a simple one line string, no preceding whitespace
        simple_docstring = u('"""simple one line docstring"""')
        simple_docstring_io = StringIO(simple_docstring)
        tokens = tokenize.generate_tokens(simple_docstring_io.readline)
        token_list = list(tokens)
        _, value, _, prefix = token_list[0]
        assert prefix == ''
        assert value == '"""simple one line docstring"""'

    def test_simple_with_whitespace(self):
        # Test a simple one line string with preceding whitespace and newline
        simple_docstring = u('  """simple one line docstring""" \r\n')
        simple_docstring_io = StringIO(simple_docstring)
        tokens = tokenize.generate_tokens(simple_docstring_io.readline)
        token_list = list(tokens)
        assert token_list[0][0] == INDENT
        typ, value, start_pos, prefix = token_list[1]
        assert prefix == '  '
        assert value == '"""simple one line docstring"""'
        assert typ == STRING
        typ, value, start_pos, prefix = token_list[2]
        assert prefix == ' '
        assert typ == NEWLINE

    def test_function_whitespace(self):
        # Test function definition whitespace identification
        fundef = dedent(u('''
        def test_whitespace(*args, **kwargs):
            x = 1
            if x > 0:
                print(True)
        '''))
        fundef_io = StringIO(fundef)
        tokens = tokenize.generate_tokens(fundef_io.readline)
        token_list = list(tokens)
        for _, value, _, prefix in token_list:
            if value == 'test_whitespace':
                assert prefix == ' '
            if value == '(':
                assert prefix == ''
            if value == '*':
                assert prefix == ''
            if value == '**':
                assert prefix == ' '
            if value == 'print':
                assert prefix == '        '
            if value == 'if':
                assert prefix == '    '

    def test_identifier_contains_unicode(self):
        fundef = dedent(u('''
        def 我あφ():
            pass
        '''))
        fundef_io = StringIO(fundef)
        tokens = tokenize.generate_tokens(fundef_io.readline)
        token_list = list(tokens)
        unicode_token = token_list[1]
        if is_py3:
            assert unicode_token[0] == NAME
        else:
            # Unicode tokens in Python 2 seem to be identified as operators.
            # They will be ignored in the parser, that's ok.
            assert unicode_token[0] == OP

    def test_quoted_strings(self):

        string_tokens = [
            'u"test"',
            'u"""test"""',
            'U"""test"""',
            "u'''test'''",
            "U'''test'''",
        ]

        for s in string_tokens:
            parsed = ParserWithRecovery(load_grammar(), u('''a = %s\n''' % s))
            simple_stmt = parsed.module.children[0]
            expr_stmt = simple_stmt.children[0]
            assert len(expr_stmt.children) == 3
            string_tok = expr_stmt.children[2]
            assert string_tok.type == 'string'
            assert string_tok.value == s
            assert string_tok.eval() == 'test'


def test_tokenizer_with_string_literal_backslash():
    import jedi
    c = jedi.Script("statement = u'foo\\\n'; statement").goto_definitions()
    assert c[0]._name._context.obj == 'foo'


def test_ur_literals():
    """
    Decided to parse `u''` literals regardless of Python version. This makes
    probably sense:

    - Python 3+ doesn't support it, but it doesn't hurt
      not be. While this is incorrect, it's just incorrect for one "old" and in
      the future not very important version.
    - All the other Python versions work very well with it.
    """
    def check(literal, is_literal=True):
        io = StringIO(u(literal))
        tokens = tokenize.generate_tokens(io.readline)
        token_list = list(tokens)
        typ, result_literal, _, _ = token_list[0]
        if is_literal:
            assert typ == STRING
            assert result_literal == literal
        else:
            assert typ == NAME

    check('u""')
    check('ur""', is_literal=not is_py3)
    check('Ur""', is_literal=not is_py3)
    check('UR""', is_literal=not is_py3)
    check('bR""')
    # Starting with Python 3.3 this ordering is also possible, but we just
    # enable it for all versions. It doesn't hurt.
    check('Rb""')
    # Starting with Python 3.6 format strings where introduced.
    check('fr""', is_literal=py_version >= 36)
    check('rF""', is_literal=py_version >= 36)
    check('f""', is_literal=py_version >= 36)
    check('F""', is_literal=py_version >= 36)