from fastapi import APIRouter, Header, HTTPException

import httpx

from app.schemas import (
  AuthLogin, AuthRegister, AuthResponse, Destination, GoogleLoginRequest,
  FavoriteRequest, FavoriteResponse, ProfileStats, UserProfile,
  UserPlanPayload,
)
from app.services.auth import (
  get_favorites, get_plan, get_user_by_token,
  login_demo, login_google, login_user, register_user, save_plan, toggle_favorite,
)
from app.services.pocketbase import pb

router = APIRouter(prefix="/auth", tags=["auth"])


@router.post("/register", response_model=AuthResponse)
async def register(body: AuthRegister):
  result = register_user(body.email, body.password, body.name)
  if not result:
    raise HTTPException(400, "该邮箱已注册")
  return AuthResponse(**result)


@router.post("/login", response_model=AuthResponse)
async def login(body: AuthLogin):
  result = login_user(body.email, body.password)
  if not result:
    raise HTTPException(401, "邮箱或密码错误")
  return AuthResponse(**result)


@router.get("/me", response_model=UserProfile)
async def me(authorization: str | None = Header(None)):
  token = _extract_token(authorization)
  user = get_user_by_token(token)
  if not user:
    raise HTTPException(401, "未登录")
  return UserProfile(**user)


@router.get("/demo", response_model=AuthResponse)
async def demo_login():
  """一键体验演示账号"""
  result = login_demo()
  if not result:
    raise HTTPException(500, "演示账号不可用")
  return AuthResponse(**result)


@router.post("/google", response_model=AuthResponse)
async def google_login(body: GoogleLoginRequest):
  try:
    async with httpx.AsyncClient(timeout=10) as client:
      res = await client.get(
        "https://oauth2.googleapis.com/tokeninfo",
        params={"id_token": body.id_token},
      )
      res.raise_for_status()
      data = res.json()
  except httpx.HTTPError:
    raise HTTPException(401, "Google 登录验证失败")
  email = data.get("email")
  verified = data.get("email_verified")
  if not email or verified not in (True, "true"):
    raise HTTPException(401, "无效的 Google 账号")
  name = data.get("name") or email.split("@")[0]
  result = login_google(email, name)
  if not result:
    raise HTTPException(500, "登录失败")
  return AuthResponse(**result)


@router.get("/favorites", response_model=FavoriteResponse)
async def list_favorites(authorization: str | None = Header(None)):
  token = _extract_token(authorization)
  if not get_user_by_token(token):
    raise HTTPException(401, "未登录")
  return FavoriteResponse(slugs=get_favorites(token))


@router.get("/favorites/detail", response_model=list[Destination])
async def favorite_details(authorization: str | None = Header(None)):
  token = _extract_token(authorization)
  user = get_user_by_token(token)
  if not user:
    raise HTTPException(401, "未登录")
  slugs = get_favorites(token)
  all_dests = await pb.get_destinations()
  return [Destination(**d) for d in all_dests if d["slug"] in slugs]


@router.get("/profile/stats", response_model=ProfileStats)
async def profile_stats(authorization: str | None = Header(None)):
  token = _extract_token(authorization)
  user = get_user_by_token(token)
  if not user:
    raise HTTPException(401, "未登录")
  favs = get_favorites(token)
  plan = get_plan(token) or {}
  cities = len(plan.get("items") or [])
  levels = [(0, "🌱 新手游民"), (1, "🎒 背包客"), (2, "✈️ 飞行游民"), (3, "🌍 环球游民")]
  explored = max(len(favs), cities)
  level = levels[min(explored, 3)][1]
  return ProfileStats(
    favorites_count=len(favs),
    destinations_explored=explored,
    member_since="2026",
    nomad_level=level,
  )


@router.post("/favorites", response_model=FavoriteResponse)
async def add_favorite(body: FavoriteRequest, authorization: str | None = Header(None)):
  token = _extract_token(authorization)
  if not get_user_by_token(token):
    raise HTTPException(401, "未登录")
  dest = await pb.get_destination(body.destination_slug)
  if not dest:
    raise HTTPException(404, "目的地不存在")
  slugs = toggle_favorite(token, body.destination_slug)
  return FavoriteResponse(slugs=slugs)


@router.get("/plan", response_model=UserPlanPayload)
async def read_plan(authorization: str | None = Header(None)):
  token = _extract_token(authorization)
  if not get_user_by_token(token):
    raise HTTPException(401, "未登录")
  plan = get_plan(token)
  if not plan:
    raise HTTPException(401, "未登录")
  return UserPlanPayload(**plan)


@router.put("/plan", response_model=UserPlanPayload)
async def write_plan(body: UserPlanPayload, authorization: str | None = Header(None)):
  token = _extract_token(authorization)
  if not get_user_by_token(token):
    raise HTTPException(401, "未登录")
  saved = save_plan(
    token,
    [item.model_dump() for item in body.items],
    body.meta.model_dump(),
    body.updated_at or None,
  )
  if not saved:
    raise HTTPException(401, "未登录")
  return UserPlanPayload(**saved)


def _extract_token(authorization: str | None) -> str:
  if not authorization:
    return ""
  if authorization.startswith("Bearer "):
    return authorization[7:]
  return authorization