#!/usr/bin/python3

import hashlib
import json
import os
import time
import typing
from typing import cast

import flask
import requests
import sqlalchemy
from sqlalchemy import func, update
from werkzeug.wrappers import Response

from confarchive import database, model

app = flask.Flask(__name__)
app.debug = True

app.config.from_object("config.default")
database.init_app(app)

wikidata_api = "https://www.wikidata.org/w/api.php"


def md5sum(s: str) -> str:
    return hashlib.md5(s.encode("utf-8")).hexdigest()


def wikidata_search(q: str) -> list[dict[str, typing.Any]]:
    q += " haswbstatement:P31=Q5"
    q_md5 = md5sum(q)

    cache_filename = os.path.join("cache", q_md5 + ".json")

    if os.path.exists(cache_filename):
        data = json.load(open(cache_filename))
    else:
        params: dict[str, str | int] = {
            "action": "query",
            "list": "search",
            "format": "json",
            "formatversion": 2,
            "srsearch": q,
            "srlimit": "max",
        }
        r = requests.get(wikidata_api, params=params)
        open(cache_filename, "w").write(r.text)
        data = r.json()
        time.sleep(1)

    return cast(dict[str, typing.Any], data["query"]["search"])


def wikidata_get_item(qid: str) -> typing.Any:
    cache_filename = os.path.join("items", qid + ".json")
    if os.path.exists(cache_filename):
        item = json.load(open(cache_filename))
    else:
        params: dict[str, str | int] = {
            "action": "wbgetentities",
            "ids": qid,
            "format": "json",
            "formatversion": 2,
        }
        r = requests.get(wikidata_api, params=params)
        item = r.json()["entities"][qid]
        with open(cache_filename, "w") as f:
            json.dump(item, f, indent=2)
        time.sleep(0.1)
    return item


def top_speakers() -> sqlalchemy.orm.query.Query:
    q = (
        database.session.query(model.Person, func.count())
        .join(model.ConferencePerson)
        .group_by(model.Person)
        .order_by(func.count().desc())
        .having(func.count() > 5)
    )
    return q


def top_speakers2() -> sqlalchemy.orm.query.Query:
    q = (
        database.session.query(model.Person, func.count())
        .join(model.ConferencePerson)
        .filter(model.Person.name.like("% %"))
        .group_by(model.Person)
        .order_by(func.count().desc())
        .having(func.count() > 2)
    )
    # .order_by(func.length(model.Person.name).desc())
    return q


def top_events() -> sqlalchemy.orm.query.Query:
    q = (
        database.session.query(model.Event.title, func.count())
        .group_by(model.Event.title)
        .order_by(func.count().desc())
        .having(func.count() > 5)
    )
    return q


@app.route("/person/<int:person_id>", methods=["GET", "POST"])
def person(person_id: int) -> str | Response:
    item = model.Person.query.get(person_id)
    if flask.request.method == "POST":
        item.wikidata_qid = flask.request.form["wikidata_qid"] or None
        item.name = flask.request.form["name"]
        database.session.commit()
        assert flask.request.endpoint
        return flask.redirect(
            flask.url_for(flask.request.endpoint, person_id=person_id)
        )

    return flask.render_template("person.html", item=item, Event=model.Event)


@app.route("/event/<int:event_id>")
def event_page(event_id: int) -> str:
    item = model.Event.query.get(event_id)
    return flask.render_template("event.html", item=item)


@app.route("/conference/<short_name>")
def conference_page(short_name: str) -> str:
    item = model.Conference.query.filter_by(short_name=short_name).one_or_none()
    if item is None:
        flask.abort(404)
    return flask.render_template("conference.html", item=item)


@app.route("/people")
def search_people() -> str:
    search_for = flask.request.args["q"]
    assert search_for
    search_for = search_for.strip()
    q = model.Person.query.filter(model.Person.name.ilike(f"%{search_for}%")).order_by(
        model.Person.name
    )
    return flask.render_template("search_people.html", q=q, search_for=search_for)


@app.route("/merge", methods=["GET", "POST"])
def merge() -> str | Response:
    if flask.request.method == "POST":
        search_for = flask.request.form["q"]

        item_ids_str = flask.request.form.getlist("person_id")
        item_ids: list[int] = [int(i) for i in item_ids_str]

        merge_to_id = min(item_ids)
        other_ids = [i for i in item_ids if i != merge_to_id]

        print(other_ids, "->", merge_to_id)

        with database.session.begin():
            print("update ConferencePerson")
            database.session.execute(
                update(model.ConferencePerson)
                .where(model.ConferencePerson.person_id.in_(other_ids))
                .values(person_id=merge_to_id)
            )

            print("update EventPerson")
            database.session.execute(
                update(model.EventPerson)
                .where(model.EventPerson.person_id.in_(other_ids))
                .values(person_id=merge_to_id)
            )

            print("delete people")
            for person_id in other_ids:
                item = model.Person.query.get(person_id)
                database.session.delete(item)

        endpoint = flask.request.endpoint
        assert endpoint
        return flask.redirect(flask.url_for(endpoint, q=search_for))

    else:
        search_for = flask.request.args["q"]

    assert search_for
    search_for = search_for.strip()
    q = model.Person.query.filter(model.Person.name.ilike(f"%{search_for}%")).order_by(
        model.Person.name
    )
    return flask.render_template("merge_people.html", q=q, search_for=search_for)


@app.route("/events")
def events_page() -> str:
    search_for = flask.request.args.get("q")
    if not search_for:
        return flask.render_template("top_events.html", top_events=top_events())

    q = model.Event.query.filter(model.Event.title.ilike(f"%{search_for}%")).order_by(
        model.Event.title
    )
    return flask.render_template("search_events.html", q=q, search_for=search_for)


@app.route("/")
def index() -> str:
    """Start page."""
    if False:
        q = (
            model.Conference.query.order_by(model.Conference.start.desc())
            .add_columns(
                func.count(model.Event.id), func.count(model.ConferencePerson.person_id)
            )
            .group_by(model.Conference)
        )

    q = model.Conference.query.order_by(model.Conference.start.desc())

    count = {
        "conference": model.Conference.query.count(),
        "event": model.Event.query.count(),
        "person": model.Person.query.count(),
    }

    return flask.render_template("index.html", items=q, count=count)


@app.route("/speakers")
def top_speakers_page() -> str:
    """Top speakers page."""
    return flask.render_template("top_speakers.html", top_speakers=top_speakers())


@app.route("/wikidata")
def link_to_wikidata() -> str:
    items = []
    for person, num in top_speakers2():
        if person.wikidata_qid:
            continue
        search_hits = wikidata_search(f'"{person.name}"')
        if not search_hits:
            continue

        if len(search_hits) > 10:
            continue

        hits = []

        for search_hit in search_hits:
            qid = search_hit["title"]
            item = wikidata_get_item(qid)
            if "en" in item["labels"]:
                label = item["labels"]["en"]["value"]
            else:
                label = "[no english label]"

            if "en" in item["descriptions"]:
                description = item["descriptions"]["en"]["value"]
            else:
                description = "[no english description]"

            hits.append(
                {
                    "qid": qid,
                    "label": label,
                    "description": description,
                }
            )

        items.append((person, num, hits))

    return flask.render_template("wikidata.html", items=items)


if __name__ == "__main__":
    app.run(host="0.0.0.0", port=5002)