"""Simple auth service with in-memory fallback when PocketBase users unavailable."""
import hashlib
import secrets
from typing import Any

from app.data import mock_data

# In-memory store for demo mode
_users: dict[str, dict] = {}
_sessions: dict[str, str] = {}  # token -> user_id
_favorites: dict[str, list[str]] = {}  # user_id -> [slugs]


def _hash_password(password: str) -> str:
  return hashlib.sha256(password.encode()).hexdigest()


def register_user(email: str, password: str, name: str) -> dict[str, Any] | None:
  if email in _users:
    return None
  uid = secrets.token_hex(8)
  _users[email] = {
    "id": uid,
    "email": email,
    "password_hash": _hash_password(password),
    "name": name,
    "avatar": "🧑‍💻",
  }
  _favorites[uid] = []
  token = secrets.token_urlsafe(32)
  _sessions[token] = uid
  return {"token": token, "user": _user_profile(_users[email])}


def login_user(email: str, password: str) -> dict[str, Any] | None:
  user = _users.get(email)
  if not user or user["password_hash"] != _hash_password(password):
    return None
  token = secrets.token_urlsafe(32)
  _sessions[token] = user["id"]
  return {"token": token, "user": _user_profile(user)}


def get_user_by_token(token: str) -> dict | None:
  uid = _sessions.get(token)
  if not uid:
    return None
  for user in _users.values():
    if user["id"] == uid:
      return _user_profile(user)
  return None


def get_favorites(token: str) -> list[str]:
  uid = _sessions.get(token)
  if not uid:
    return []
  return _favorites.get(uid, [])


def toggle_favorite(token: str, slug: str) -> list[str]:
  uid = _sessions.get(token)
  if not uid:
    return []
  favs = _favorites.setdefault(uid, [])
  if slug in favs:
    favs.remove(slug)
  else:
    favs.append(slug)
  return favs


def _user_profile(user: dict) -> dict:
  return {
    "id": user["id"],
    "email": user["email"],
    "name": user["name"],
    "avatar": user.get("avatar", "🧑‍💻"),
  }

# Demo account
_demo = register_user("demo@nomadflow.io", "demo123", "演示用户")
DEMO_TOKEN = _demo["token"] if _demo else ""