# coding: utf-8
from __future__ import unicode_literals

from spacy.gold import biluo_tags_from_offsets, offsets_from_biluo_tags
from spacy.tokens import Doc


def test_gold_biluo_U(en_vocab):
    words = ["I", "flew", "to", "London", "."]
    spaces = [True, True, True, False, True]
    doc = Doc(en_vocab, words=words, spaces=spaces)
    entities = [(len("I flew to "), len("I flew to London"), "LOC")]
    tags = biluo_tags_from_offsets(doc, entities)
    assert tags == ["O", "O", "O", "U-LOC", "O"]


def test_gold_biluo_BL(en_vocab):
    words = ["I", "flew", "to", "San", "Francisco", "."]
    spaces = [True, True, True, True, False, True]
    doc = Doc(en_vocab, words=words, spaces=spaces)
    entities = [(len("I flew to "), len("I flew to San Francisco"), "LOC")]
    tags = biluo_tags_from_offsets(doc, entities)
    assert tags == ["O", "O", "O", "B-LOC", "L-LOC", "O"]


def test_gold_biluo_BIL(en_vocab):
    words = ["I", "flew", "to", "San", "Francisco", "Valley", "."]
    spaces = [True, True, True, True, True, False, True]
    doc = Doc(en_vocab, words=words, spaces=spaces)
    entities = [(len("I flew to "), len("I flew to San Francisco Valley"), "LOC")]
    tags = biluo_tags_from_offsets(doc, entities)
    assert tags == ["O", "O", "O", "B-LOC", "I-LOC", "L-LOC", "O"]


def test_gold_biluo_misalign(en_vocab):
    words = ["I", "flew", "to", "San", "Francisco", "Valley."]
    spaces = [True, True, True, True, True, False]
    doc = Doc(en_vocab, words=words, spaces=spaces)
    entities = [(len("I flew to "), len("I flew to San Francisco Valley"), "LOC")]
    tags = biluo_tags_from_offsets(doc, entities)
    assert tags == ["O", "O", "O", "-", "-", "-"]


def test_roundtrip_offsets_biluo_conversion(en_tokenizer):
    text = "I flew to Silicon Valley via London."
    biluo_tags = ["O", "O", "O", "B-LOC", "L-LOC", "O", "U-GPE", "O"]
    offsets = [(10, 24, "LOC"), (29, 35, "GPE")]
    doc = en_tokenizer(text)
    biluo_tags_converted = biluo_tags_from_offsets(doc, offsets)
    assert biluo_tags_converted == biluo_tags
    offsets_converted = offsets_from_biluo_tags(doc, biluo_tags)
    assert offsets_converted == offsets