# Code borrowed from DaCy (Kenneth)


"""
TODO:
- Save data to HF datasets
- save as docbin using # docbin.to_disk(path, store_user_data=True)
"""

import json
from collections import defaultdict
from pathlib import Path

import spacy
from conllu import parse
from spacy.tokens import Doc, DocBin, Span, Token
from spacy.training.corpus import Corpus

file_path = Path(__file__)
assets_path = file_path.parent.parent / "assets"
corpus_path = file_path.parent.parent / "corpus"

Doc.set_extension("domain", default=None)
Doc.set_extension("sent_id", default=None)
Doc.set_extension("sent_ids", default=None)
Doc.set_extension("conllu", default=None)
Doc.set_extension("doc_id", default=None)
Token.set_extension("qid", default=None)


def load_cdt(custom_split_ids: bool = True):
    """
    Load the copenhagen dependency treebank / DaCoref dataset
    """
    cdt_path = assets_path / "dacoref" / "CDT_coref.conllu"
    with cdt_path.open(encoding="utf-8") as f:
        text = f.read()

    sentences = parse(
        text,
        fields=[
            "id",
            "form",
            "lemma",
            "upos",
            "xpos",
            "feats",
            "head",
            "deprel",
            "deps",
            "misc",
            "coref_id",
            "coref_rel",
            "doc_id",
            "qid",
        ],
    )

    if not custom_split_ids:  # use the ones specified by the authors
        split_ids = {"train": [], "dev": [], "test": []}

        for split in split_ids:
            split_path = assets_path / "dacoref" / f"CDT_{split}_ids.json"
            with split_path.open(encoding="utf-8") as f:
                split_ids[split] = json.load(f)

    else:  # use the one we created that respects the DDT splits
        with open(assets_path / "CDT_ddt_compatible_splits.json") as f:
            split_ids = json.load(f)

    return sentences, split_ids


def _add_sent_id(docs, split, dataset):
    path = assets_path / dataset / f"{split}.conllu"
    with path.open(encoding="utf-8") as f:
        text = f.read()
    sentences = parse(text)
    for sent, doc in zip(sentences, docs):
        assert doc.text.strip() == sent.metadata["text"].strip()
        doc._.sent_id = sent.metadata["sent_id"]
        doc._.conllu = sent


def load_da_ddt():
    """
    Loads the UD Danish Dependency Treebank
    """
    nlp = spacy.blank("da")
    ddt_path = corpus_path / "da_ddt"

    # With a single file
    ddt = {}
    for split in ["train", "dev", "test"]:
        path = ddt_path / f"{split}.spacy"
        corpus = Corpus(path, shuffle=False)
        examples = list(corpus(nlp))
        docs = [e.reference for e in examples]
        ddt[split] = docs
        _add_sent_id(docs, split, dataset="da_ddt")

    return ddt


def load_dane():
    """
    Loads the UD Danish Dependency Treebank
    """
    nlp = spacy.blank("da")
    dane_path = corpus_path / "dane"

    # With a single file
    dane = {}
    for split in ["train", "dev", "test"]:
        path = dane_path / f"{split}.spacy"
        corpus = Corpus(path, shuffle=False)
        examples = list(corpus(nlp))
        docs = [e.reference for e in examples]
        dane[split] = docs
        _add_sent_id(docs, split, dataset="dane")
    return dane

# original
#def add_dane_to_ddt(ddt, dane):
#    """
#    Add the dane data to the ddt data
#    """
#    for split in ["train", "dev", "test"]:
#        assert len(ddt[split]) == len(dane[split])
#        for doc, dane_doc in zip(ddt[split], dane[split]):
#            
#            # assert doc.text.strip() == dane_doc.text.strip() <-- Removed to not crash script because of whitespace misalignment. Mikkel
#            # Claude recommended this check instead due to benign whitespace misalignment (see diagnose_dane_to_ddt_mismatch.py):
#            assert [t.text for t in doc] == [t.text for t in dane_doc], (
#                f"token mismatch at {doc._.sent_id}: "
#                f"{[t.text for t in doc]!r} vs {[t.text for t in dane_doc]!r}"
#            )
#
#            assert doc._.sent_id == dane_doc._.sent_id
#            # convert dane ents to ddt ents
#            ents = [Span(doc, e.start, e.end, label=e.label_) for e in dane_doc.ents]
#            doc.ents = ents
#    return ddt

def add_dane_to_ddt(ddt, dane):
    """
    Add the dane data to the ddt data
    """
    dane_ddt_path = corpus_path / "dane_ddt"
    dane_ddt_path.mkdir(parents=True, exist_ok=True)
    for split in ["train", "dev", "test"]:
        assert len(ddt[split]) == len(dane[split])
        doc_bin = DocBin(store_user_data=True)   # moved inside, fresh per split
        for doc, dane_doc in zip(ddt[split], dane[split]):
            assert [t.text for t in doc] == [t.text for t in dane_doc], (
                f"token mismatch at {doc._.sent_id}: "
                f"{[t.text for t in doc]!r} vs {[t.text for t in dane_doc]!r}"
            )
            assert doc._.sent_id == dane_doc._.sent_id
            ents = [Span(doc, e.start, e.end, label=e.label_) for e in dane_doc.ents]
            doc.ents = ents
            doc_bin.add(doc)                     # actually add the modified doc
        save_path = dane_ddt_path / f"{split}.spacy"
        doc_bin.to_disk(save_path)
    return ddt

def combine_docs(cdt_sentences, ddt_dane):
    sent_id_to_doc_instance = {}
    for _split, docs in ddt_dane.items():
        for doc in docs:
            assert doc._.sent_id not in sent_id_to_doc_instance
            sent_id_to_doc_instance[doc._.sent_id] = doc

    # combine documents
    doc_to_be_created: dict[str, list[str]] = {}
    sent_id_to_sent = {}
    for sent in cdt_sentences:
        sent_id = sent.metadata["sent_id"]
        doc_id = sent[0]["doc_id"]
        if doc_id not in doc_to_be_created:
            doc_to_be_created[doc_id] = []
        doc_to_be_created[doc_id].append(sent_id)
        sent_id_to_sent[sent_id] = sent

    # create docs
    domain_mapping = {
        "mz": "magazine",
        "bn": "broadcast",
        "nw": "newswire",
    }
    docs = []
    for doc_id, sent_ids in doc_to_be_created.items():
        _docs = [sent_id_to_doc_instance.pop(sent_id) for sent_id in sent_ids]
        doc = Doc.from_docs(_docs)
        doc._.doc_id = doc_id
        doc._.sent_ids = sent_ids
        doc._.domain = domain_mapping[doc_id.split("/")[0]]
        doc._.conllu = [sent_id_to_sent[sent_id] for sent_id in sent_ids]
        docs.append(doc)

    # add the remaining docs
    for sent_id in list(sent_id_to_doc_instance.keys()):
        doc = sent_id_to_doc_instance.pop(sent_id)
        docs.append(doc)
    return docs


def add_coreference(cdt_sentences, docs):
    doc_id_to_doc_instance = {doc._.doc_id: doc for doc in docs}
    doc_id_to_cdt_sent = defaultdict(list)
    for sent in cdt_sentences:
        doc_id = sent[0]["doc_id"]
        doc_id_to_cdt_sent[doc_id].append(sent)

    for doc_id, sents in doc_id_to_cdt_sent.items():
        clustermap = defaultdict(list)
        doc = doc_id_to_doc_instance[doc_id]
        tokens = [t for sent in sents for t in sent]
        assert len(doc) == len(tokens)
        for token, s_token in zip(tokens, doc):  # type: ignore
            coref_rel = token["coref_rel"]
            if coref_rel == "-":
                continue
            clusters = sorted(coref_rel.split("|"), reverse=True)
            for mention in clusters:
                full_mention = mention.startswith("(") and mention.endswith(")")
                start_mention = mention.startswith("(")
                end_mention = mention.endswith(")")
                if full_mention:
                    cid = mention[1:-1]
                    clustermap[cid].insert(0, (s_token.i, s_token.i + 1))
                elif start_mention:
                    cid = mention[1:]
                    clustermap[cid].append(s_token.i)
                elif end_mention:
                    cid = mention[:-1]
                    start = clustermap[cid].pop()
                    clustermap[cid].insert(0, (start, s_token.i + 1))
        for i, (_key, vals) in enumerate(clustermap.items()):
            spans = [doc[start:end] for start, end in vals]
            skey = f"coref_clusters_{i}"
            doc.spans[skey] = spans

        # parse and get heads
        for i, (_key, val) in enumerate(clustermap.items()):
            heads = [doc[start:end].root.i for start, end in val]
            heads = list(set(heads))
            if len(heads) == 1:
                continue
            spans = [doc[hh : hh + 1] for hh in heads]
            skey = f"coref_head_clusters_{i}"
            doc.spans[skey] = spans
    return docs


def add_qid(docs):
    # add QID to each token
    for doc in docs:
        if doc._.doc_id is None:
            continue
        sents = doc._.conllu
        tokens = [t for sent in sents for t in sent]
        qid_spans = {}  # construct qid spans to check if any of them are not entities
        qid = None
        start = None
        for t, s_t in zip(tokens, doc):
            end_of_span = qid is not None and (t["qid"] == "-" or t["qid"] != qid)
            if end_of_span:
                qid_spans[(start, s_t.i)] = qid
                start = None
                qid = None
            if t["qid"] != "-":
                qid = t["qid"]
                assert qid.startswith("Q")
                s_t._.qid = qid
                if start is None:
                    start = s_t.i
        if start is not None:
            qid_spans[(start, s_t.i)] = qid  # type: ignore

        ents_spans = {(ent.start, ent.end) for ent in doc.ents}
        for qid_span in qid_spans:
            if qid_span[1] - qid_span[0] == 1:
                continue  # ignore single token spans
            if qid_span not in ents_spans:
                print(
                    f"{doc[qid_span[0]:qid_span[1]]} with QID {qid_spans[qid_span]} is not in entities",
                )
            # great no problems here!!

        # map QID to each entity
        new_ents = []
        for ent in doc.ents:
            start, end = ent.start, ent.end
            qids = [t["qid"] for t in tokens[start:end]]
            unique_qid = len(set(qids)) == 1
            if unique_qid:
                qid = qids[0]
                new_ent = Span(doc, start, end, label=ent.label_, kb_id=qid)
            else:
                print(f"Ent {ent} has multiple QIDs: {qids}")
                new_ent = Span(doc, start, end, label=ent.label_)
            new_ents.append(new_ent)
        doc.ents = new_ents
    return docs


cdt_sentences, cdf_split_ids = load_cdt()
doc_id_to_split_mapping = {
    id_: split for split, ids in cdf_split_ids.items() for id_ in ids
}

ddt = load_da_ddt()
dane = load_dane()
ddt_dane = add_dane_to_ddt(ddt, dane)

# add doc_id
sent_id_to_doc_id = {}
for sent in cdt_sentences:
    sent_id_to_doc_id[sent.metadata["sent_id"]] = sent[0]["doc_id"]
for split in ["train", "dev", "test"]:
    for doc in ddt_dane[split]:
        if doc._.sent_id in sent_id_to_doc_id:
            doc._.doc_id = sent_id_to_doc_id[doc._.sent_id]

# check that splits are the same  -- they are not
# for split in ["train", "dev", "test"]:
#     for doc in ddt_dane[split]:
#         assert doc_id_to_split_mapping[doc._.doc_id] == split

# any doc id in cdt that is not in ddt_dane
doc_ids = {doc._.doc_id for split, docs in ddt_dane.items() for doc in docs}
doc_ids_cdt = {sent[0]["doc_id"] for sent in cdt_sentences}
assert len(doc_ids_cdt - doc_ids) == 0

docs = combine_docs(cdt_sentences, ddt_dane)
docs = add_coreference(cdt_sentences, docs)
#docs = add_qid(docs)

doc_bin = DocBin(store_user_data=True)
for doc in docs:
    doc_bin.add(doc)

save_path = corpus_path / "cdt_ddt" / "data.spacy"
save_path.parent.mkdir(parents=True, exist_ok=True)
doc_bin.to_disk(save_path)

# do it again for the cdt only but do it in splits:
for split in ["train", "dev", "test"]:
    doc_bin = DocBin(store_user_data=True)
    for doc in docs:
        if doc._.doc_id is None:
            continue
        _split = doc_id_to_split_mapping[doc._.doc_id]
        if _split != split:
            continue
        doc_bin.add(doc)

    save_path = corpus_path / "cdt" / f"{split}.spacy"
    save_path.parent.mkdir(parents=True, exist_ok=True)
    doc_bin.to_disk(save_path)