# coding: utf-8
from __future__ import unicode_literals

from spacy.gold import biluo_tags_from_offsets, offsets_from_biluo_tags, Example, DocAnnotation
from spacy.gold import spans_from_biluo_tags, GoldParse, iob_to_biluo
from spacy.gold import GoldCorpus, docs_to_json, align
from spacy.lang.en import English
from spacy.tokens import Doc
from spacy.util import compounding, minibatch
from .util import make_tempdir
import pytest
import srsly


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_overlap(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"),
        (len("I flew to "), len("I flew to San Francisco"), "LOC"),
    ]
    with pytest.raises(ValueError):
        biluo_tags_from_offsets(doc, entities)


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


def test_biluo_spans(en_tokenizer):
    doc = en_tokenizer("I flew to Silicon Valley via London.")
    biluo_tags = ["O", "O", "O", "B-LOC", "L-LOC", "O", "U-GPE", "O"]
    spans = spans_from_biluo_tags(doc, biluo_tags)
    assert len(spans) == 2
    assert spans[0].text == "Silicon Valley"
    assert spans[0].label_ == "LOC"
    assert spans[1].text == "London"
    assert spans[1].label_ == "GPE"


def test_gold_ner_missing_tags(en_tokenizer):
    doc = en_tokenizer("I flew to Silicon Valley via London.")
    biluo_tags = [None, "O", "O", "B-LOC", "L-LOC", "O", "U-GPE", "O"]
    gold = GoldParse(doc, entities=biluo_tags)  # noqa: F841


def test_iob_to_biluo():
    good_iob = ["O", "O", "B-LOC", "I-LOC", "O", "B-PERSON"]
    good_biluo = ["O", "O", "B-LOC", "L-LOC", "O", "U-PERSON"]
    bad_iob = ["O", "O", '"', "B-LOC", "I-LOC"]
    converted_biluo = iob_to_biluo(good_iob)
    assert good_biluo == converted_biluo
    with pytest.raises(ValueError):
        iob_to_biluo(bad_iob)


def test_roundtrip_docs_to_json():
    text = "I flew to Silicon Valley via London."
    tags = ["PRP", "VBD", "IN", "NNP", "NNP", "IN", "NNP", "."]
    heads = [1, 1, 1, 4, 2, 1, 5, 1]
    deps = ["nsubj", "ROOT", "prep", "compound", "pobj", "prep", "pobj", "punct"]
    biluo_tags = ["O", "O", "O", "B-LOC", "L-LOC", "O", "U-GPE", "O"]
    cats = {"TRAVEL": 1.0, "BAKING": 0.0}
    nlp = English()
    doc = nlp(text)
    for i in range(len(tags)):
        doc[i].tag_ = tags[i]
        doc[i].dep_ = deps[i]
        doc[i].head = doc[heads[i]]
    doc.ents = spans_from_biluo_tags(doc, biluo_tags)
    doc.cats = cats
    doc.is_tagged = True
    doc.is_parsed = True

    # roundtrip to JSON
    with make_tempdir() as tmpdir:
        json_file = tmpdir / "roundtrip.json"
        srsly.write_json(json_file, [docs_to_json(doc)])
        goldcorpus = GoldCorpus(train=str(json_file), dev=str(json_file))

    reloaded_example = next(goldcorpus.train_dataset(nlp))
    goldparse = reloaded_example.gold

    assert len(doc) == goldcorpus.count_train()
    assert text == reloaded_example.text
    assert tags == goldparse.tags
    assert deps == goldparse.labels
    assert heads == goldparse.heads
    assert biluo_tags == goldparse.ner
    assert "TRAVEL" in goldparse.cats
    assert "BAKING" in goldparse.cats
    assert cats["TRAVEL"] == goldparse.cats["TRAVEL"]
    assert cats["BAKING"] == goldparse.cats["BAKING"]

    # roundtrip to JSONL train dicts
    with make_tempdir() as tmpdir:
        jsonl_file = tmpdir / "roundtrip.jsonl"
        srsly.write_jsonl(jsonl_file, [docs_to_json(doc)])
        goldcorpus = GoldCorpus(str(jsonl_file), str(jsonl_file))

    reloaded_example = next(goldcorpus.train_dataset(nlp))
    goldparse = reloaded_example.gold

    assert len(doc) == goldcorpus.count_train()
    assert text == reloaded_example.text
    assert tags == goldparse.tags
    assert deps == goldparse.labels
    assert heads == goldparse.heads
    assert biluo_tags == goldparse.ner
    assert "TRAVEL" in goldparse.cats
    assert "BAKING" in goldparse.cats
    assert cats["TRAVEL"] == goldparse.cats["TRAVEL"]
    assert cats["BAKING"] == goldparse.cats["BAKING"]

    # roundtrip to JSONL tuples
    with make_tempdir() as tmpdir:
        jsonl_file = tmpdir / "roundtrip.jsonl"
        # write to JSONL train dicts
        srsly.write_jsonl(jsonl_file, [docs_to_json(doc)])
        goldcorpus = GoldCorpus(str(jsonl_file), str(jsonl_file))
        # load and rewrite as JSONL tuples
        srsly.write_jsonl(jsonl_file, goldcorpus.train_examples)
        goldcorpus = GoldCorpus(str(jsonl_file), str(jsonl_file))

    reloaded_example = next(goldcorpus.train_dataset(nlp))
    goldparse = reloaded_example.gold

    assert len(doc) == goldcorpus.count_train()
    assert text == reloaded_example.text
    assert tags == goldparse.tags
    assert deps == goldparse.labels
    assert heads == goldparse.heads
    assert biluo_tags == goldparse.ner
    assert "TRAVEL" in goldparse.cats
    assert "BAKING" in goldparse.cats
    assert cats["TRAVEL"] == goldparse.cats["TRAVEL"]
    assert cats["BAKING"] == goldparse.cats["BAKING"]


# xfail while we have backwards-compatible alignment
@pytest.mark.xfail
@pytest.mark.parametrize(
    "tokens_a,tokens_b,expected",
    [
        (["a", "b", "c"], ["ab", "c"], (3, [-1, -1, 1], [-1, 2], {0: 0, 1: 0}, {})),
        (
            ["a", "b", "``", "c"],
            ['ab"', "c"],
            (4, [-1, -1, -1, 1], [-1, 3], {0: 0, 1: 0, 2: 0}, {}),
        ),
        (["a", "bc"], ["ab", "c"], (4, [-1, -1], [-1, -1], {0: 0}, {1: 1})),
        (
            ["ab", "c", "d"],
            ["a", "b", "cd"],
            (6, [-1, -1, -1], [-1, -1, -1], {1: 2, 2: 2}, {0: 0, 1: 0}),
        ),
        (
            ["a", "b", "cd"],
            ["a", "b", "c", "d"],
            (3, [0, 1, -1], [0, 1, -1, -1], {}, {2: 2, 3: 2}),
        ),
        ([" ", "a"], ["a"], (1, [-1, 0], [1], {}, {})),
    ],
)
def test_align(tokens_a, tokens_b, expected):
    cost, a2b, b2a, a2b_multi, b2a_multi = align(tokens_a, tokens_b)
    assert (cost, list(a2b), list(b2a), a2b_multi, b2a_multi) == expected
    # check symmetry
    cost, a2b, b2a, a2b_multi, b2a_multi = align(tokens_b, tokens_a)
    assert (cost, list(b2a), list(a2b), b2a_multi, a2b_multi) == expected


def test_goldparse_startswith_space(en_tokenizer):
    text = " a"
    doc = en_tokenizer(text)
    g = GoldParse(doc, words=["a"], entities=["U-DATE"], deps=["ROOT"], heads=[0])
    assert g.words == [" ", "a"]
    assert g.ner == [None, "U-DATE"]
    assert g.labels == [None, "ROOT"]


def test_gold_constructor():
    """Test that the GoldParse constructor works fine"""
    nlp = English()
    doc = nlp("This is a sentence")
    gold = GoldParse(doc, cats={"cat1": 1.0, "cat2": 0.0})

    assert gold.cats["cat1"]
    assert not gold.cats["cat2"]
    assert gold.words == ["This", "is", "a", "sentence"]


def test_gold_orig_annot():
    nlp = English()
    doc = nlp("This is a sentence")
    gold = GoldParse(doc, cats={"cat1": 1.0, "cat2": 0.0})

    assert gold.orig.words == ["This", "is", "a", "sentence"]
    assert gold.cats["cat1"]

    doc_annotation = DocAnnotation(cats={"cat1": 0.0, "cat2": 1.0})
    gold2 = GoldParse.from_annotation(doc, doc_annotation, gold.orig)
    assert gold2.orig.words == ["This", "is", "a", "sentence"]
    assert not gold2.cats["cat1"]


def test_tuple_format_implicit():
    """Test tuple format with implicit GoldParse creation"""

    train_data = [
        ("Uber blew through $1 million a week", {"entities": [(0, 4, "ORG")]}),
        (
            "Spotify steps up Asia expansion",
            {"entities": [(0, 8, "ORG"), (17, 21, "LOC")]},
        ),
        ("Google rebrands its business apps", {"entities": [(0, 6, "ORG")]}),
    ]

    _train(train_data)


def test_tuple_format_implicit_invalid():
    """Test that an error is thrown for an implicit invalid GoldParse field"""

    train_data = [
        ("Uber blew through $1 million a week", {"frumble": [(0, 4, "ORG")]}),
        (
            "Spotify steps up Asia expansion",
            {"entities": [(0, 8, "ORG"), (17, 21, "LOC")]},
        ),
        ("Google rebrands its business apps", {"entities": [(0, 6, "ORG")]}),
    ]

    with pytest.raises(TypeError):
        _train(train_data)


def _train(train_data):
    nlp = English()
    ner = nlp.create_pipe("ner")
    ner.add_label("ORG")
    ner.add_label("LOC")
    nlp.add_pipe(ner)

    optimizer = nlp.begin_training()
    for i in range(5):
        losses = {}
        batches = minibatch(train_data, size=compounding(4.0, 32.0, 1.001))
        for batch in batches:
            nlp.update(batch, sgd=optimizer, losses=losses)


tokens_1 = {
    "ids": [1, 2, 3],
    "words": ["Hi", "there", "everyone"],
    "tags": ["INTJ", "ADV", "PRON"],
}

tokens_2 = {
    "ids": [1, 2, 3, 4],
    "words": ["It", "is", "just", "me"],
    "tags": ["PRON", "AUX", "ADV", "PRON"],
}

text0 = "Hi there everyone It is just me"


def test_merge_sents():
    nlp = English()
    example = Example()
    example.add_token_annotation(**tokens_1)
    example.add_token_annotation(**tokens_2)
    assert len(example.get_gold_parses(merge=False, vocab=nlp.vocab)) == 2
    assert len(example.get_gold_parses(merge=True, vocab=nlp.vocab)) == 1   # this shouldn't change the original object

    merged_example = example.merge_sents()

    token_annotation_1 = example.token_annotations[0]
    assert token_annotation_1.ids == [1, 2, 3]
    assert token_annotation_1.words == ["Hi", "there", "everyone"]
    assert token_annotation_1.tags == ["INTJ", "ADV", "PRON"]

    token_annotation_m = merged_example.token_annotations[0]
    assert token_annotation_m.ids == [1, 2, 3, 4, 5, 6, 7]
    assert token_annotation_m.words == ["Hi", "there", "everyone", "It", "is", "just", "me"]
    assert token_annotation_m.tags == ["INTJ", "ADV", "PRON", "PRON", "AUX", "ADV", "PRON"]


def test_tuples_to_example():
    ex = Example()
    ex.add_token_annotation(**tokens_1)
    ex.add_token_annotation(**tokens_2)
    ex.add_doc_annotation(cats={"TRAVEL": 1.0, "BAKING": 0.0})
    ex_dict = ex.to_dict()

    token_dicts = [
        {
            "ids": [1, 2, 3],
            "words": ["Hi", "there", "everyone"],
            "tags": ["INTJ", "ADV", "PRON"],
            "heads": [],
            "deps": [],
            "entities": [],
            "morphology": [],
            "brackets": [],
        },
        {
            "ids": [1, 2, 3, 4],
            "words": ["It", "is", "just", "me"],
            "tags": ["PRON", "AUX", "ADV", "PRON"],
            "heads": [],
            "deps": [],
            "entities": [],
            "morphology": [],
            "brackets": [],
        },
    ]
    doc_dict = {"cats": {"TRAVEL": 1.0, "BAKING": 0.0}, "links": {}}

    assert ex_dict == {"token_annotations": token_dicts, "doc_annotation": doc_dict}