import random
import string
from flask import Blueprint, jsonify, request
from ..models import db
from ..models.session import Session, Participant
from ..services.session_recipes import add_recipe_batch, serialize_recipe
from ..services.session_settings import get_match_mode, get_required_likes, get_voting_round

bp = Blueprint("sessions", __name__)


def generate_code():
    return "".join(random.choices(string.ascii_uppercase + string.digits, k=6))


def serialize_session(session):
    return {
        "id": session.id,
        "code": session.code,
        "status": session.status,
        "currentRecipeIndex": session.current_recipe_index,
        "participants": [
            {"id": p.id, "name": p.name, "isHost": p.is_host}
            for p in session.participants
        ],
        "recipes": [serialize_recipe(recipe) for recipe in session.recipes],
        "matchedRecipeId": session.matched_recipe_id,
        "requiredLikes": get_required_likes(session),
        "matchMode": get_match_mode(session),
        "votingRound": get_voting_round(session),
    }


@bp.post("")
def create_session():
    data = request.get_json() or {}
    name = (data.get("name") or "Host").strip()

    code = generate_code()
    while Session.query.filter_by(code=code).first():
        code = generate_code()

    session = Session(code=code)
    db.session.add(session)
    db.session.flush()

    host = Participant(session_id=session.id, name=name, is_host=True)
    db.session.add(host)

    add_recipe_batch(session)

    db.session.commit()
    return jsonify({"session": serialize_session(session), "participantId": host.id})


@bp.post("/<code>/join")
def join_session(code):
    data = request.get_json() or {}
    name = (data.get("name") or "Gast").strip()

    session = Session.query.filter_by(code=code.upper()).first_or_404()
    if session.status != "waiting":
        return jsonify({"error": "Session wurde bereits gestartet."}), 409

    participant = Participant(session_id=session.id, name=name, is_host=False)
    db.session.add(participant)
    db.session.commit()
    return jsonify({"session": serialize_session(session), "participantId": participant.id})


@bp.get("/<code>")
def get_session(code):
    session = Session.query.filter_by(code=code.upper()).first_or_404()
    return jsonify({"session": serialize_session(session)})