import httpx
from typing import Any

from app.config import settings
from app.data import mock_data


class PocketBaseService:
  def __init__(self):
    self.base_url = settings.pocketbase_url.rstrip("/")
    self._token: str | None = None
    self._available: bool | None = None

  async def is_available(self) -> bool:
    if self._available is not None:
      return self._available
    try:
      async with httpx.AsyncClient(timeout=1.0) as client:
        r = await client.get(f"{self.base_url}/api/health")
        self._available = r.status_code == 200
    except Exception:
      self._available = False
    return self._available

  async def _auth(self, client: httpx.AsyncClient) -> bool:
    if self._token:
      return True
    try:
      r = await client.post(
        f"{self.base_url}/api/admins/auth-with-password",
        json={
          "identity": settings.pocketbase_admin_email,
          "password": settings.pocketbase_admin_password,
        },
      )
      if r.status_code == 200:
        self._token = r.json().get("token")
        return True
    except Exception:
      pass
    return False

  async def list_records(self, collection: str, sort: str = "") -> list[dict[str, Any]]:
    if not await self.is_available():
      return []

    params: dict[str, str] = {"perPage": "200"}
    if sort:
      params["sort"] = sort

    try:
      async with httpx.AsyncClient(timeout=10.0) as client:
        headers = {}
        if await self._auth(client):
          headers["Authorization"] = self._token or ""

        r = await client.get(
          f"{self.base_url}/api/collections/{collection}/records",
          params=params,
          headers=headers,
        )
        if r.status_code == 200:
          items = r.json().get("items", [])
          return items if items else []
    except Exception:
      pass
    return []

  async def create_record(self, collection: str, data: dict[str, Any]) -> dict[str, Any] | None:
    if not await self.is_available():
      return None

    try:
      async with httpx.AsyncClient(timeout=10.0) as client:
        headers = {}
        if await self._auth(client):
          headers["Authorization"] = self._token or ""

        r = await client.post(
          f"{self.base_url}/api/collections/{collection}/records",
          json=data,
          headers=headers,
        )
        if r.status_code in (200, 201):
          return r.json()
    except Exception:
      pass
    return None

  async def get_destinations(
    self, region: str | None = None, search: str | None = None, sort: str = "rating"
  ) -> list[dict]:
    records = await self.list_records("destinations", sort=f"-{sort}" if sort != "cost" else "cost")
    if not records:
      records = mock_data.DESTINATIONS
    else:
      records = [self._map_destination(r) for r in records]

    if region and region != "all":
      records = [d for d in records if d.get("region") == region]
    if search:
      q = search.lower()
      records = [
        d for d in records
        if q in d.get("name", "").lower() or q in d.get("country", "").lower()
      ]
    return self._sort_destinations(records, sort)

  async def get_destination(self, slug: str) -> dict | None:
    records = await self.get_destinations()
    return next((d for d in records if d.get("slug") == slug), None)

  async def get_visas(self) -> list[dict]:
    records = await self.list_records("visas", sort="difficulty")
    return records if records else mock_data.VISAS

  async def get_faqs(self) -> list[dict]:
    records = await self.list_records("faqs", sort="order")
    return records if records else mock_data.FAQS

  async def get_testimonials(self) -> list[dict]:
    records = await self.list_records("testimonials")
    return records if records else mock_data.TESTIMONIALS

  async def get_tools(self) -> list[dict]:
    records = await self.list_records("tools")
    return records if records else mock_data.TOOLS

  async def get_blog_posts(self) -> list[dict]:
    records = await self.list_records("blog_posts", sort="-published_at")
    return records if records else mock_data.BLOG_POSTS

  async def get_blog_post(self, slug: str) -> dict | None:
    posts = await self.get_blog_posts()
    post = next((p for p in posts if p.get("slug") == slug), None)
    if not post:
      return None
    content = post.get("content") or mock_data.BLOG_CONTENT.get(slug, "")
    return {**post, "content": content}

  async def subscribe(self, email: str) -> tuple[bool, str]:
    existing = await self.list_records("subscriptions")
    if any(s.get("email") == email for s in existing):
      return True, "你已经订阅过了，欢迎回来！"

    result = await self.create_record("subscriptions", {"email": email})
    if result:
      return True, "订阅成功！欢迎加入 NomadFlow 社区 🎉"
    # fallback: always succeed in demo mode
    return True, "订阅成功！欢迎加入 NomadFlow 社区 🎉"

  def _map_destination(self, r: dict) -> dict:
    return {
      "id": r.get("id", ""),
      "slug": r.get("slug", ""),
      "name": r.get("name", ""),
      "country": r.get("country", ""),
      "emoji": r.get("emoji", ""),
      "tag": r.get("tag", ""),
      "description": r.get("description", ""),
      "region": r.get("region", ""),
      "cost": r.get("cost", 0),
      "speed": r.get("speed", 0),
      "temperature": r.get("temperature", 0),
      "rating": r.get("rating", 0),
      "hue": r.get("hue", 170),
      "nomads_count": r.get("nomads_count", ""),
      "highlights": r.get("highlights", []),
      "map_x": r.get("map_x", 0),
      "map_y": r.get("map_y", 0),
    }

  def _sort_destinations(self, records: list[dict], sort: str) -> list[dict]:
    if sort == "cost-asc":
      return sorted(records, key=lambda x: x.get("cost", 0))
    if sort == "cost-desc":
      return sorted(records, key=lambda x: x.get("cost", 0), reverse=True)
    if sort == "speed":
      return sorted(records, key=lambda x: x.get("speed", 0), reverse=True)
    return sorted(records, key=lambda x: x.get("rating", 0), reverse=True)


pb = PocketBaseService()