# coding: utf8
from __future__ import unicode_literals

import pytest
from spacy.tokens import Span
from spacy.language import Language
from spacy.pipeline import EntityRuler


@pytest.fixture
def nlp():
    return Language()


@pytest.fixture
def patterns():
    return [
        {"label": "HELLO", "pattern": "hello world"},
        {"label": "BYE", "pattern": [{"LOWER": "bye"}, {"LOWER": "bye"}]},
        {"label": "HELLO", "pattern": [{"ORTH": "HELLO"}]},
        {"label": "COMPLEX", "pattern": [{"ORTH": "foo", "OP": "*"}]}
    ]

@pytest.fixture
def add_ent():
    def add_ent_component(doc):
        doc.ents = [Span(doc, 0, 3, label=doc.vocab.strings['ORG'])]
        return doc
    return add_ent_component


def test_entity_ruler_init(nlp, patterns):
    ruler = EntityRuler(nlp, patterns=patterns)
    assert len(ruler) == len(patterns)
    assert len(ruler.labels) == 3
    assert 'HELLO' in ruler
    assert 'BYE' in ruler
    nlp.add_pipe(ruler)
    doc = nlp("hello world bye bye")
    assert len(doc.ents) == 2
    assert doc.ents[0].label_ == 'HELLO'
    assert doc.ents[1].label_ == 'BYE'


def test_entity_ruler_existing(nlp, patterns, add_ent):
    ruler = EntityRuler(nlp, patterns=patterns)
    nlp.add_pipe(add_ent)
    nlp.add_pipe(ruler)
    doc = nlp("OH HELLO WORLD bye bye")
    assert len(doc.ents) == 2
    assert doc.ents[0].label_ == 'ORG'
    assert doc.ents[1].label_ == 'BYE'


def test_entity_ruler_existing_overwrite(nlp, patterns, add_ent):
    ruler = EntityRuler(nlp, patterns=patterns, overwrite_ents=True)
    nlp.add_pipe(add_ent)
    nlp.add_pipe(ruler)
    doc = nlp("OH HELLO WORLD bye bye")
    assert len(doc.ents) == 2
    assert doc.ents[0].label_ == 'HELLO'
    assert doc.ents[0].text == 'HELLO'
    assert doc.ents[1].label_ == 'BYE'


def test_entity_ruler_existing_complex(nlp, patterns, add_ent):
    ruler = EntityRuler(nlp, patterns=patterns, overwrite_ents=True)
    nlp.add_pipe(add_ent)
    nlp.add_pipe(ruler)
    doc = nlp("foo foo bye bye")
    assert len(doc.ents) == 2
    assert doc.ents[0].label_ == 'COMPLEX'
    assert doc.ents[1].label_ == 'BYE'
    assert len(doc.ents[0]) == 2
    assert len(doc.ents[1]) == 2


def test_entity_ruler_serialize_bytes(nlp, patterns):
    ruler = EntityRuler(nlp, patterns=patterns)
    assert len(ruler) == len(patterns)
    assert len(ruler.labels) == 3
    ruler_bytes = ruler.to_bytes()
    new_ruler = EntityRuler(nlp)
    assert len(new_ruler) == 0
    assert len(new_ruler.labels) == 0
    new_ruler = new_ruler.from_bytes(ruler_bytes)
    assert len(ruler) == len(patterns)
    assert len(ruler.labels) == 3