#!venv/bin/python

from flask import Flask, render_template, jsonify, request, abort, send_file, url_for
from flask_sqlalchemy import SQLAlchemy
from flask_cors import CORS
from lxml import etree
from argparse import ArgumentParser
import requests
import json
import uuid
import markdown
from datetime import datetime, time, timedelta
from html_sanitizer import Sanitizer
from hashlib import sha256

app = Flask(__name__)
db = SQLAlchemy()


class TalkPreference(db.Model):
    """A preference of halfnarp frontend. An array of strings"""

    uid = db.Column(db.String, primary_key=True)
    public_uid = db.Column(db.String, index=True)
    talk_ids = db.Column(db.String)


"""
@app.route("/")
def root():
    return render_template("index.html")
"""

@app.route("/-/talkpreferences", methods=["GET"])
def sessions():
    return send_file("var/talks_local", mimetype="application/json")


@app.route("/-/talkpreferences/<uid>", methods=["GET"])
def get_own_preferences(uid):
    pref = db.session.get(TalkPreference, uid)
    if pref == None:
        abort(404)

    return jsonify(
        {
            "hashed_uid": pref.public_uid,
            "public_url": url_for(
                "get_preferences",
                public_uid=public_uid,
                _external=True,
                _scheme="https",
            ),
            "talk_ids": json.loads(pref.talk_ids),
            "uid": pref.uid,
        }
    )


@app.route("/-/talkpreferences/", methods=["POST"])
def store_preferences():
    try:
        content = request.json
        talk_ids = content["talk_ids"]
    except:
        abort(400)

    if not all(isinstance(elem, str) for elem in talk_ids):
        abort(400)

    uid = str(uuid.uuid4())
    public_uid = str(sha256(uid.encode("utf-8")).hexdigest())

    db.session.add(
        TalkPreference(uid=uid, public_uid=public_uid, talk_ids=json.dumps(talk_ids))
    )
    db.session.commit()
    return jsonify(
        {
            "uid": uid,
            "hashed_uid": str(public_uid),
            "public_url": url_for(
                "get_preferences",
                public_uid=public_uid,
                _external=True,
                _scheme="https",
            ),
            "update_url": url_for(
                "update_preferences", uid=uid, _external=True, _scheme="https"
            ),
        }
    )


@app.route("/-/talkpreferences/<uid>", methods=["POST", "PUT"])
def update_preferences(uid):
    pref = db.session.get(TalkPreference, uid)
    if pref == None:
        abort(404)

    content = request.json
    pref.talk_ids = json.dumps(content["talk_ids"])
    db.session.commit()

    return jsonify({"uid": pref.uid, "hashed_uid": pref.public_uid})


@app.route("/-/talkpreferences/public/<public_uid>", methods=["GET"])
def get_preferences(public_uid):
    pref = (
        db.session.query(TalkPreference)
        .filter(TalkPreference.public_uid == public_uid)
        .first()
    )
    if pref == None:
        abort(404)

    return jsonify({"hash": pref.public_uid, "talk_ids": json.loads(pref.talk_ids)})


def filter_keys_halfnarp(session):
    abstract_html = markdown.markdown(session["abstract"], enable_attributes=False)
    abstract_clean_html = Sanitizer().sanitize(abstract_html)
    slot = session["slot"]

    return {
        "title": session.get("title", "!!! NO TITLE !!!"),
        "duration": 60 * session.get("duration", 40),
        "event_id": session["code"],
        "language": session.get("content_locale", "de"),
        "track_id": session["track_id"],
        "speaker_names": ", ".join(
            [speaker.get("name", "unnamed") for speaker in session.get("speakers", {})]
        ),
        "abstract": abstract_clean_html,
        "room_id": slot.get("room_id", "room_unknown"),
        "start_time": slot.get("start", "1970-01-01"),
    }


def filter_keys_fullnarp(session, speakers):
    abstract_html = markdown.markdown(session["abstract"], enable_attributes=False)
    abstract_clean_html = Sanitizer().sanitize(abstract_html)
    slot = session["slot"]

    speaker_info = []
    for speaker in session.get("speakers", {}):
        speaker_info.append(speakers[speaker["code"]])
        # if len(speakers[speaker['code']]['availabilities']) == 0:
        #     print ( "Track " + str(submission['track_id']) + ": Speaker " + speaker.get('name', 'unname') + " on session: " + session.get('title', '!!! NO TITLE !!!') + " without availability. https://cfp.cccv.de/orga/event/38c3/session/" + session['code'] )

        """This fixes availabilites ranging to or from exactly midnight to the more likely start of availibility at 8am and end of availibility at 3am"""

        for avail in speakers[speaker["code"]]["availabilities"]:
            start_new = datetime.fromisoformat(avail["start"])
            end_new = datetime.fromisoformat(avail["end"])

            start = datetime.fromisoformat(avail["start"])
            end = datetime.fromisoformat(avail["end"])
            if start.time() == time(0, 0):
                start_new = start + timedelta(hours=10)
            if end.time() == time(0, 0):
                end_new = end + timedelta(hours=3)

            if start != start_new or end != end_new:
                print(
                    "Fixing "
                    + str(start)
                    + " - "
                    + str(end)
                    + " to "
                    + str(start_new)
                    + " - "
                    + str(end_new)
                )
                avail["start"] = str(start_new)
                avail["end"] = str(end_new)

    return {
        "title": session.get("title", "!!! NO TITLE !!!"),
        "duration": 60 * session.get("duration", 40),
        "event_id": session["code"],
        "language": session.get("content_locale", "de"),
        "track_id": session["track_id"],
        "speakers": speaker_info,
        "speaker_names": ", ".join(
            [speaker.get("name", "unnamed") for speaker in session.get("speakers", {})]
        ),
        "abstract": abstract_clean_html,
        "room_id": "room" + str(slot.get("room_id", "_unknown")),
        "start_time": slot.get("start", "1970-01-01"),
    }


def fetch_talks(config):
    sess = requests.Session()

    response = sess.get(
        config["pretalx-api-url"] + "/submissions/?format=json&limit=20000",
        stream=True,
        headers={"Authorization": "Token " + config["pretalx-token"]},
    )
    # with open('dump.txt', mode='wb') as localfile:
    #           localfile.write(response.content)
    talks_json = json.loads(response.text)

    response = sess.get(
        config["pretalx-api-url"] + "/speakers/?format=json&limit=20000",
        stream=True,
        headers={"Authorization": "Token " + config["pretalx-token"]},
    )
    speakers_json = json.loads(response.text)
    speakers = dict((speaker["code"], speaker) for speaker in speakers_json["results"])

    sessions = [
        filter_keys_halfnarp(submission)
        for submission in talks_json["results"]
        if submission["state"] == "confirmed"
        and not "non-public" in submission.get("tags", {})
    ]
    with open("var/talks_local", mode="w", encoding="utf8") as sessionsfile:
        json.dump(sessions, sessionsfile)

    sessions = [
        filter_keys_fullnarp(submission, speakers)
        for submission in talks_json["results"]
        if submission["state"] == "confirmed" or submission["state"] == "accepted"
    ]
    with open("var/talks_local_fullnarp", mode="w", encoding="utf8") as sessionsfile:
        json.dump(sessions, sessionsfile)


def export_prefs(config):
    print("[")
    for preference in TalkPreference.query.all():
        print(preference.talk_ids + ",")
    print("[]]")


if __name__ == "__main__":
    parser = ArgumentParser(description="halfnarp2")
    parser.add_argument(
        "-i",
        action="store_true",
        dest="pretalx_import",
        default=False,
        help="import events from pretalx",
    )
    parser.add_argument(
        "-e",
        action="store_true",
        dest="fullnarp_export",
        default=False,
        help="export preferences to json",
    )
    parser.add_argument(
        "-c", "--config", help="Config file location", default="./config.json"
    )
    args = parser.parse_args()

    with open(args.config, mode="r", encoding="utf-8") as json_file:
        config = json.load(json_file)
    config["pretalx-api-url"] = (
        config["pretalx-url"] + "api/events/" + config["pretalx-conference"]
    )

    app.config["SQLALCHEMY_DATABASE_URI"] = config.get(
        "database-uri", "sqlite:///test.db"
    )
    app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
    app.config["SERVER_NAME"] = config.get("server-name", "localhost")
    app.config["SECRET_KEY"] = config.get("server-secret", "<YOUR SERVER SECRET HERE>")

    if app.config["SECRET_KEY"] == "<YOUR SERVER SECRET HERE>":
        print("You must set the server-secret in your config.json")
        sys.exit(1)

    app.jinja_env.trim_blocks = True
    app.jinja_env.lstrip_blocks = True
    CORS()

    db.init_app(app)

    with app.app_context():
        db.create_all()
        if args.pretalx_import:
            fetch_talks(config)
        elif args.fullnarp_export:
            export_prefs(config)
        else:
            app.run(
                host=config.get("host", "127.0.0.1"),
                port=int(config.get("port", "8080")),
            )