# coding: utf-8
from __future__ import unicode_literals

import pytest
import re
from spacy.tokens import Doc
from spacy.vocab import Vocab
from spacy.lang.en import English
from spacy.lang.lex_attrs import LEX_ATTRS
from spacy.matcher import Matcher
from spacy.tokenizer import Tokenizer
from spacy.lemmatizer import Lemmatizer
from spacy.symbols import ORTH, LEMMA, POS, VERB, VerbForm_part


def test_issue1242():
    nlp = English()
    doc = nlp('')
    assert len(doc) == 0
    docs = list(nlp.pipe(['', 'hello']))
    assert len(docs[0]) == 0
    assert len(docs[1]) == 1


def test_issue1250():
    """Test cached special cases."""
    special_case = [{ORTH: 'reimbur', LEMMA: 'reimburse', POS: 'VERB'}]
    nlp = English()
    nlp.tokenizer.add_special_case('reimbur', special_case)
    lemmas = [w.lemma_ for w in nlp('reimbur, reimbur...')]
    assert lemmas == ['reimburse', ',', 'reimburse', '...']
    lemmas = [w.lemma_ for w in nlp('reimbur, reimbur...')]
    assert lemmas == ['reimburse', ',', 'reimburse', '...']


def test_issue1257():
    """Test that tokens compare correctly."""
    doc1 = Doc(Vocab(), words=['a', 'b', 'c'])
    doc2 = Doc(Vocab(), words=['a', 'c', 'e'])
    assert doc1[0] != doc2[0]
    assert not doc1[0] == doc2[0]


def test_issue1375():
    """Test that token.nbor() raises IndexError for out-of-bounds access."""
    doc = Doc(Vocab(), words=['0', '1', '2'])
    with pytest.raises(IndexError):
        assert doc[0].nbor(-1)
    assert doc[1].nbor(-1).text == '0'
    with pytest.raises(IndexError):
        assert doc[2].nbor(1)
    assert doc[1].nbor(1).text == '2'


def test_issue1387():
    tag_map = {'VBG': {POS: VERB, VerbForm_part: True}}
    index = {"verb": ("cope","cop")}
    exc = {"verb": {"coping": ("cope",)}}
    rules = {"verb": [["ing", ""]]}
    lemmatizer = Lemmatizer(index, exc, rules)
    vocab = Vocab(lemmatizer=lemmatizer, tag_map=tag_map)
    doc = Doc(vocab, words=["coping"])
    doc[0].tag_ = 'VBG'
    assert doc[0].text == "coping"
    assert doc[0].lemma_ == "cope"


def test_issue1434():
    """Test matches occur when optional element at end of short doc."""
    pattern = [{'ORTH': 'Hello' }, {'IS_ALPHA': True, 'OP': '?'}]
    vocab = Vocab(lex_attr_getters=LEX_ATTRS)
    hello_world = Doc(vocab, words=['Hello', 'World'])
    hello = Doc(vocab, words=['Hello'])
    matcher = Matcher(vocab)
    matcher.add('MyMatcher', None, pattern)
    matches = matcher(hello_world)
    assert matches
    matches = matcher(hello)
    assert matches


@pytest.mark.parametrize('string,start,end', [
    ('a', 0, 1), ('a b', 0, 2), ('a c', 0, 1), ('a b c', 0, 2),
    ('a b b c', 0, 3), ('a b b', 0, 3),])
def test_issue1450(string, start, end):
    """Test matcher works when patterns end with * operator."""
    pattern = [{'ORTH': "a"}, {'ORTH': "b", 'OP': "*"}]
    matcher = Matcher(Vocab())
    matcher.add("TSTEND", None, pattern)
    doc = Doc(Vocab(), words=string.split())
    matches = matcher(doc)
    if start is None or end is None:
        assert matches == []
    assert matches[-1][1] == start
    assert matches[-1][2] == end


def test_issue1488():
    prefix_re = re.compile(r'''[\[\("']''')
    suffix_re = re.compile(r'''[\]\)"']''')
    infix_re = re.compile(r'''[-~\.]''')
    simple_url_re = re.compile(r'''^https?://''')

    def my_tokenizer(nlp):
        return Tokenizer(nlp.vocab, {},
                         prefix_search=prefix_re.search,
                         suffix_search=suffix_re.search,
                         infix_finditer=infix_re.finditer,
                         token_match=simple_url_re.match)

    nlp = English()
    nlp.tokenizer = my_tokenizer(nlp)
    doc = nlp("This is a test.")
    for token in doc:
        assert token.text


def test_issue1494():
    infix_re = re.compile(r'''[^a-z]''')
    test_cases = [('token 123test', ['token', '1', '2', '3', 'test']),
                  ('token 1test', ['token', '1test']),
                  ('hello...test', ['hello', '.', '.', '.', 'test'])]
    new_tokenizer = lambda nlp: Tokenizer(nlp.vocab, {}, infix_finditer=infix_re.finditer)
    nlp = English()
    nlp.tokenizer = new_tokenizer(nlp)
    for text, expected in test_cases:
        assert [token.text for token in nlp(text)] == expected