"""Meetup live room URL builders — ported from NomadCNA."""

from __future__ import annotations

import os
import re
from urllib.parse import urlencode

MIROTALK_URL = os.getenv("MIROTALK_URL", "https://mirotalk.nomadro.com")
LOUNGE_URL = os.getenv("LOUNGE_URL", "https://lounge.nomadro.com")

VIP_ROLES = frozenset({"admin", "owner", "host", "organizer", "moderator"})


def normalize_room(value: str) -> str:
  slug = re.sub(r"[^a-z0-9]+", "-", (value or "").lower()).strip("-")
  return slug[:64] or "nomadro-live"


def create_mirotalk_room_slug(meetup: dict) -> str:
  city = normalize_room(meetup.get("city") or "online")
  date = (meetup.get("date") or "").replace("-", "")[:8]
  time_part = (meetup.get("time") or "0000").replace(":", "")[:4]
  mid = normalize_room(meetup.get("id") or "room")
  return f"nomadro-{city}-{date}-{time_part}-{mid}"


def create_lounge_channel(meetup: dict) -> str:
  if meetup.get("loungeChannel"):
    ch = meetup["loungeChannel"].strip()
    return ch if ch.startswith("#") else f"#{ch}"
  if meetup.get("mirotalkRoom"):
    return f"#{normalize_room(meetup['mirotalkRoom'])}"
  return f"#{create_mirotalk_room_slug(meetup)}"


def build_mirotalk_join_url(meetup: dict, display_name: str = "nomadro") -> str:
  explicit = (meetup.get("meetingUrl") or "").strip()
  if explicit.startswith("http"):
    return explicit
  room = meetup.get("mirotalkRoom") or create_mirotalk_room_slug(meetup)
  return f"{MIROTALK_URL.rstrip('/')}/join?{urlencode({'room': room, 'name': display_name})}"


def build_lounge_chat_url(meetup: dict) -> str:
  channel = create_lounge_channel(meetup).lstrip("#")
  return f"{LOUNGE_URL.rstrip('/')}/#/chan-{channel}"


def can_access_meetup(meetup: dict, user: dict | None, is_vip: bool = False) -> tuple[bool, str]:
  level = meetup.get("access_level") or "public"
  if level == "public":
    return True, ""
  if not user:
    return False, "login_required"
  if level == "members":
    return True, ""
  if level == "vip":
    role = (user.get("role") or "").lower()
    if is_vip or role in VIP_ROLES:
      return True, ""
    return False, "vip_required"
  if level == "hosts":
    role = (user.get("role") or "").lower()
    if role in VIP_ROLES:
      return True, ""
    return False, "host_required"
  return True, ""