"""
Flask endpoints for reference (citation) endpoints. Eg, listing references
"inbound" and "outbound" from a specific release or work.
"""

import json
from typing import Optional

from flask import Response, jsonify, render_template, request
from fuzzycat.grobid_unstructured import (
    grobid_api_process_citation,
    grobid_ref_to_release,
    transform_grobid_ref_xml,
)
from fuzzycat.simple import close_fuzzy_biblio_matches, close_fuzzy_release_matches

from fatcat_tools.references import (
    RefHits,
    RefHitsEnriched,
    enrich_inbound_refs,
    enrich_outbound_refs,
    get_inbound_refs,
    get_outbound_refs,
)
from fatcat_tools.transforms.access import release_access_options
from fatcat_tools.transforms.entities import entity_to_dict
from fatcat_web import AnyResponse, api, app
from fatcat_web.cors import crossdomain
from fatcat_web.entity_helpers import generic_get_entity
from fatcat_web.forms import ReferenceMatchForm


def _refs_web(
    direction: str,
    release_ident: Optional[str] = None,
    work_ident: Optional[str] = None,
    openlibrary_id: Optional[str] = None,
    wikipedia_article: Optional[str] = None,
) -> RefHitsEnriched:
    offset_arg = request.args.get("offset", "0")
    offset: int = max(0, int(offset_arg)) if offset_arg.isnumeric() else 0
    limit_arg = request.args.get("limit", "30")
    limit: int = min(max(0, int(limit_arg)), 100) if limit_arg.isnumeric() else 30
    if direction == "in":
        hits = get_inbound_refs(
            release_ident=release_ident,
            work_ident=work_ident,
            openlibrary_work=openlibrary_id,
            es_client=app.es_client,
            offset=offset,
            limit=limit,
        )
        enriched_hits = hits.as_enriched(
            enrich_inbound_refs(
                hits.result_refs,
                fatcat_api_client=api,
                expand="container,files,webcaptures",
            )
        )
    elif direction == "out":
        hits = get_outbound_refs(
            release_ident=release_ident,
            wikipedia_article=wikipedia_article,
            work_ident=work_ident,
            es_client=app.es_client,
            offset=offset,
            limit=limit,
        )
        enriched_hits = hits.as_enriched(
            enrich_outbound_refs(
                hits.result_refs,
                fatcat_api_client=api,
                expand="container,files,webcaptures",
            )
        )
    else:
        raise ValueError()
    return enriched_hits


@app.route("/release/<string(length=26):ident>/refs-in", methods=["GET"])
def release_view_refs_inbound(ident: str) -> AnyResponse:
    if request.accept_mimetypes.best == "application/json":
        return release_view_refs_inbound_json(ident)

    release = generic_get_entity("release", ident)
    hits = _refs_web("in", release_ident=ident)
    return (
        render_template(
            "release_view_fuzzy_refs.html", direction="in", entity=release, hits=hits
        ),
        200,
    )


@app.route("/release/<string(length=26):ident>/refs-out", methods=["GET"])
def release_view_refs_outbound(ident: str) -> AnyResponse:
    if request.accept_mimetypes.best == "application/json":
        return release_view_refs_outbound_json(ident)

    release = generic_get_entity("release", ident)
    hits = _refs_web("out", release_ident=ident)
    return (
        render_template(
            "release_view_fuzzy_refs.html", direction="out", entity=release, hits=hits
        ),
        200,
    )


@app.route("/openlibrary/OL<int:id_num>W/refs-in", methods=["GET"])
def openlibrary_view_refs_inbound(id_num: int) -> AnyResponse:
    if request.accept_mimetypes.best == "application/json":
        return openlibrary_view_refs_inbound_json(id_num)

    openlibrary_id = f"OL{id_num}W"
    hits = _refs_web("in", openlibrary_id=openlibrary_id)
    return (
        render_template(
            "openlibrary_view_fuzzy_refs.html",
            openlibrary_id=openlibrary_id,
            direction="in",
            hits=hits,
        ),
        200,
    )


@app.route(
    "/wikipedia/<string(length=2):wiki_lang>:<string:wiki_article>/refs-out", methods=["GET"]
)
def wikipedia_view_refs_outbound(wiki_lang: str, wiki_article: str) -> AnyResponse:
    if request.accept_mimetypes.best == "application/json":
        return wikipedia_view_refs_outbound_json(wiki_lang, wiki_article)

    wiki_url = f"https://{wiki_lang}.wikipedia.org/wiki/{wiki_article}"
    wiki_article = wiki_article.replace("_", " ")
    wikipedia_article = wiki_lang + ":" + wiki_article
    hits = _refs_web("out", wikipedia_article=wikipedia_article)
    return (
        render_template(
            "wikipedia_view_fuzzy_refs.html",
            wiki_article=wiki_article,
            wiki_lang=wiki_lang,
            wiki_url=wiki_url,
            direction="out",
            hits=hits,
        ),
        200,
    )


@app.route("/reference/match", methods=["GET", "POST"])
def reference_match() -> AnyResponse:

    grobid_status = None
    grobid_dict = None

    form = ReferenceMatchForm()
    if not form.is_submitted() and request.args.get("submit_type"):
        form = ReferenceMatchForm(request.args)

    if form.is_submitted() or request.args.get("title"):
        if form.validate():
            if form.submit_type.data == "parse":
                resp_xml = grobid_api_process_citation(form.raw_citation.data)
                if not resp_xml:
                    grobid_status = "failed"
                    return (
                        render_template(
                            "reference_match.html", form=form, grobid_status=grobid_status
                        ),
                        400,
                    )
                grobid_dict = transform_grobid_ref_xml(resp_xml)
                if not grobid_dict:
                    grobid_status = "empty"
                    return (
                        render_template(
                            "reference_match.html", form=form, grobid_status=grobid_status
                        ),
                        200,
                    )
                # print(grobid_dict)
                release_stub = grobid_ref_to_release(grobid_dict)
                # remove empty values from GROBID parsed dict
                grobid_dict = {k: v for k, v in grobid_dict.items() if v is not None}
                form = ReferenceMatchForm.from_grobid_parse(grobid_dict, form.raw_citation.data)
                grobid_status = "success"
                matches = (
                    close_fuzzy_release_matches(
                        es_client=app.es_client, release=release_stub, match_limit=10
                    )
                    or []
                )
            elif form.submit_type.data == "match":
                matches = (
                    close_fuzzy_biblio_matches(
                        es_client=app.es_client, biblio=form.data, match_limit=10
                    )
                    or []
                )
            else:
                raise NotImplementedError()

            for m in matches:
                # expand releases more completely
                m.release = api.get_release(
                    m.release.ident,
                    expand="container,files,filesets,webcaptures",
                    hide="abstract,refs",
                )
                # hack in access options
                m.access_options = release_access_options(m.release)

            return (
                render_template(
                    "reference_match.html",
                    form=form,
                    grobid_dict=grobid_dict,
                    grobid_status=grobid_status,
                    matches=matches,
                ),
                200,
            )

        elif form.errors:
            return render_template("reference_match.html", form=form), 400

    return render_template("reference_match.html", form=form), 200


### Pseudo-APIs #############################################################


@app.route("/release/<string(length=26):ident>/refs-out.json", methods=["GET", "OPTIONS"])
@crossdomain(origin="*", headers=["access-control-allow-origin", "Content-Type"])
def release_view_refs_outbound_json(ident: str) -> AnyResponse:
    hits = _refs_web("out", release_ident=ident)
    return Response(hits.json(exclude_unset=True), mimetype="application/json")


@app.route("/release/<string(length=26):ident>/refs-in.json", methods=["GET", "OPTIONS"])
@crossdomain(origin="*", headers=["access-control-allow-origin", "Content-Type"])
def release_view_refs_inbound_json(ident: str) -> AnyResponse:
    hits = _refs_web("in", release_ident=ident)
    return Response(hits.json(exclude_unset=True), mimetype="application/json")


@app.route("/openlibrary/OL<int:id_num>W/refs-in.json", methods=["GET", "OPTIONS"])
@crossdomain(origin="*", headers=["access-control-allow-origin", "Content-Type"])
def openlibrary_view_refs_inbound_json(id_num: int) -> AnyResponse:
    openlibrary_id = f"OL{id_num}W"
    hits = _refs_web("in", openlibrary_id=openlibrary_id)
    return Response(hits.json(exclude_unset=True), mimetype="application/json")


@app.route(
    "/wikipedia/<string(length=2):wiki_lang>:<string:wiki_article>/refs-out.json",
    methods=["GET", "OPTIONS"],
)
@crossdomain(origin="*", headers=["access-control-allow-origin", "Content-Type"])
def wikipedia_view_refs_outbound_json(wiki_lang: str, wiki_article: str) -> AnyResponse:
    wiki_article = wiki_article.replace("_", " ")
    wikipedia_article = wiki_lang + ":" + wiki_article
    hits = _refs_web("out", wikipedia_article=wikipedia_article)
    return Response(hits.json(exclude_unset=True), mimetype="application/json")


@app.route("/reference/match.json", methods=["GET", "OPTIONS"])
@crossdomain(origin="*", headers=["access-control-allow-origin", "Content-Type"])
def reference_match_json() -> AnyResponse:
    form = ReferenceMatchForm(request.args)
    if form.validate():
        if form.submit_type.data == "match":
            matches = (
                close_fuzzy_biblio_matches(
                    es_client=app.es_client, biblio=form.data, match_limit=10
                )
                or []
            )
        else:
            raise NotImplementedError()
        resp = []
        for m in matches:
            # expand releases more completely
            m.release = api.get_release(
                m.release.ident,
                expand="container,files,filesets,webcaptures",
                hide="abstract,refs",
            )
            # hack in access options
            m.access_options = release_access_options(m.release)

            # and manually convert to dict (for jsonify)
            info = m.__dict__
            info["release"] = entity_to_dict(m.release)
            info["access_options"] = [o.dict() for o in m.access_options]
            resp.append(info)
        return jsonify(resp), 200
    else:
        return Response(
            json.dumps(dict(errors=form.errors)), mimetype="application/json", status=400
        )