"""Oasis cloud client."""

from __future__ import annotations

from datetime import timedelta
import logging
from typing import Any
from urllib.parse import urljoin

from aiohttp import ClientResponseError, ClientSession

from ..exceptions import UnauthenticatedError
from ..utils import now

_LOGGER = logging.getLogger(__name__)

BASE_URL = "https://app.grounded.so"
PLAYLISTS_REFRESH_LIMITER = timedelta(minutes=5)


class OasisCloudClient:
    """Cloud client for Oasis.

    Responsibilities:
    - Manage aiohttp session (optionally owned)
    - Manage access token
    - Provide async_* helpers for:
        * login/logout
        * user info
        * devices
        * tracks/playlists
        * latest software metadata
    """

    _session: ClientSession | None
    _owns_session: bool
    _access_token: str | None

    # these are "cache" fields for tracks/playlists
    _playlists_next_refresh: float
    playlists: list[dict[str, Any]]
    _playlist_details: dict[int, dict[str, str]]

    def __init__(
        self,
        *,
        session: ClientSession | None = None,
        access_token: str | None = None,
    ) -> None:
        self._session = session
        self._owns_session = session is None
        self._access_token = access_token

        # simple in-memory caches
        self._playlists_next_refresh = 0.0
        self.playlists = []
        self._playlist_details = {}

    @property
    def session(self) -> ClientSession:
        """Return (or lazily create) the aiohttp ClientSession."""
        if self._session is None or self._session.closed:
            self._session = ClientSession()
            self._owns_session = True
        return self._session

    async def async_close(self) -> None:
        """Close owned session (call from HA unload / cleanup)."""
        if self._session and not self._session.closed and self._owns_session:
            await self._session.close()

    @property
    def access_token(self) -> str | None:
        return self._access_token

    @access_token.setter
    def access_token(self, value: str | None) -> None:
        self._access_token = value

    async def async_login(self, email: str, password: str) -> None:
        """Login via the cloud and store the access token."""
        response = await self._async_request(
            "POST",
            urljoin(BASE_URL, "api/auth/login"),
            json={"email": email, "password": password},
        )
        token = response.get("access_token") if isinstance(response, dict) else None
        self.access_token = token
        _LOGGER.debug("Cloud login succeeded, token set: %s", bool(token))

    async def async_logout(self) -> None:
        """Logout from the cloud."""
        await self._async_auth_request("GET", "api/auth/logout")
        self.access_token = None

    async def async_get_user(self) -> dict:
        """Get current user info."""
        return await self._async_auth_request("GET", "api/auth/user")

    async def async_get_devices(self) -> list[dict[str, Any]]:
        """Get user devices (raw JSON from API)."""
        return await self._async_auth_request("GET", "api/user/devices")

    async def async_get_playlists(
        self, personal_only: bool = False
    ) -> list[dict[str, Any]]:
        """Get playlists from the cloud (cached by PLAYLISTS_REFRESH_LIMITER)."""
        if self._playlists_next_refresh <= now():
            params = {"my_playlists": str(personal_only).lower()}
            playlists = await self._async_auth_request(
                "GET", "api/playlist", params=params
            )
            if playlists:
                self.playlists = playlists
            self._playlists_next_refresh = now() + PLAYLISTS_REFRESH_LIMITER
        return self.playlists

    async def async_get_track_info(self, track_id: int) -> dict[str, Any] | None:
        """Get single track info from the cloud."""
        try:
            return await self._async_auth_request("GET", f"api/track/{track_id}")
        except ClientResponseError as err:
            if err.status == 404:
                return {"id": track_id, "name": f"Unknown Title (#{track_id})"}
        except Exception as ex:  # noqa: BLE001
            _LOGGER.exception("Error fetching track %s: %s", track_id, ex)
        return None

    async def async_get_tracks(
        self, tracks: list[int] | None = None
    ) -> list[dict[str, Any]]:
        """Get multiple tracks info from the cloud (handles pagination)."""
        response = await self._async_auth_request(
            "GET",
            "api/track",
            params={"ids[]": tracks or []},
        )
        if not response:
            return []
        track_details = response.get("data", [])
        while next_page_url := response.get("next_page_url"):
            response = await self._async_auth_request("GET", next_page_url)
            track_details += response.get("data", [])
        return track_details

    async def async_get_latest_software_details(self) -> dict[str, int | str]:
        """Get latest software metadata from cloud."""
        return await self._async_auth_request("GET", "api/software/last-version")

    async def _async_auth_request(self, method: str, url: str, **kwargs: Any) -> Any:
        """Perform an authenticated cloud request."""
        if not self.access_token:
            raise UnauthenticatedError("Unauthenticated")

        headers = kwargs.pop("headers", {}) or {}
        headers["Authorization"] = f"Bearer {self.access_token}"

        return await self._async_request(
            method,
            url if url.startswith("http") else urljoin(BASE_URL, url),
            headers=headers,
            **kwargs,
        )

    async def _async_request(self, method: str, url: str, **kwargs: Any) -> Any:
        """Low-level HTTP helper for both cloud and (if desired) device HTTP."""
        session = self.session
        _LOGGER.debug(
            "%s %s",
            method,
            session._build_url(url).update_query(  # pylint: disable=protected-access
                kwargs.get("params"),
            ),
        )
        response = await session.request(method, url, **kwargs)

        if response.status == 200:
            if response.content_type == "application/json":
                return await response.json()
            if response.content_type == "text/plain":
                return await response.text()
            if response.content_type == "text/html" and BASE_URL in url:
                text = await response.text()
                if "login-page" in text:
                    raise UnauthenticatedError("Unauthenticated")
            return None

        if response.status == 401:
            raise UnauthenticatedError("Unauthenticated")

        response.raise_for_status()