from __future__ import annotations

import logging
from typing import Any, Dict, Optional

import requests
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.utils import timezone

logger = logging.getLogger(__name__)


class WebEgressError(Exception):
    def __init__(
        self,
        message: str,
        *,
        status_code: Optional[int] = None,
        response_data: Optional[Dict[str, Any]] = None,
    ):
        super().__init__(message)
        self.status_code = status_code
        self.response_data = response_data or {}


class WebEgressClient:
    def __init__(
        self,
        *,
        base_url: Optional[str] = None,
        service_token: Optional[str] = None,
        timeout: Optional[float] = None,
    ):
        self.base_url = (
            base_url
            or getattr(settings, "ONLINE_CLASS_WEB_EGRESS_SERVICE_URL", "")
        ).rstrip("/")
        self.service_token = (
            service_token
            or getattr(settings, "ONLINE_CLASS_WEB_EGRESS_SERVICE_TOKEN", "")
        )
        self.timeout = timeout or getattr(
            settings, "ONLINE_CLASS_WEB_EGRESS_TIMEOUT", 20.0
        )

        if not self.base_url:
            raise ImproperlyConfigured(
                "ONLINE_CLASS_WEB_EGRESS_SERVICE_URL must be configured."
            )

    def start_recording(self, payload: Dict[str, Any]) -> Dict[str, Any]:
        return self._request("POST", "/api/web-egress/start/", json=payload)

    def stop_recording(self, payload: Dict[str, Any]) -> Dict[str, Any]:
        return self._request("POST", "/api/web-egress/stop/", json=payload)

    def get_status(self, *, room_id: str, session_id: int) -> Dict[str, Any]:
        return self._request(
            "GET",
            "/api/web-egress/status/",
            params={"room_id": room_id, "session_id": session_id},
        )

    def _request(self, method: str, path: str, **kwargs) -> Dict[str, Any]:
        headers = kwargs.pop("headers", {})
        headers["Content-Type"] = "application/json"
        if self.service_token:
            headers["Authorization"] = f"Bearer {self.service_token}"

        request_url = f"{self.base_url}{path}"

        try:
            response = requests.request(
                method,
                request_url,
                headers=headers,
                timeout=self.timeout,
                **kwargs,
            )
        except requests.RequestException as exc:
            logger.exception(
                "[WebEgressClient] Request failed method=%s url=%s error=%s",
                method,
                request_url,
                str(exc),
            )
            raise WebEgressError("Failed to reach WebEgress service.") from exc

        data = self._safe_json(response)
        if response.status_code >= 400:
            message = (
                (data or {}).get("message")
                or (data or {}).get("detail")
                or response.text
                or "WebEgress service request failed."
            )
            logger.error(
                "[WebEgressClient] Non-success response method=%s url=%s status=%s message=%s payload=%s",
                method,
                request_url,
                response.status_code,
                message,
                data,
            )
            raise WebEgressError(
                message,
                status_code=response.status_code,
                response_data=data,
            )

        if data is None:
            raise WebEgressError("WebEgress service returned an invalid response.")

        if isinstance(data, dict) and data.get("status") is False:
            raise WebEgressError(
                data.get("message") or data.get("detail") or "WebEgress failed.",
                status_code=response.status_code,
                response_data=data,
            )

        return data

    @staticmethod
    def _safe_json(response: requests.Response) -> Optional[Dict[str, Any]]:
        try:
            return response.json()
        except ValueError:
            return None


def is_web_egress_recording_status(status_value: str) -> bool:
    return str(status_value or "").strip().lower() in {
        "starting",
        "recording",
        "stopping",
    }


def stop_session_web_egress_if_active(session) -> bool:
    """
    Best-effort stop for an active WebEgress recording.

    Returns True when a stop request was sent, otherwise False.
    This helper never raises and is safe to call from close-session flows.
    """
    if not getattr(settings, "ONLINE_CLASS_WEB_EGRESS_ENABLED", False):
        return False

    if not session or not is_web_egress_recording_status(
        getattr(session, "web_egress_status", "")
    ):
        return False

    try:
        client = WebEgressClient()
        client.stop_recording(
            {
                "session_id": session.id,
                "room_id": session.room_id,
                "egress_id": session.web_egress_id,
            }
        )
    except (ImproperlyConfigured, WebEgressError) as exc:
        logger.warning(
            "[WebEgress] Failed to stop active recording during session close - session_id=%s room_id=%s error=%s",
            session.id,
            session.room_id,
            str(exc),
        )
        return False

    session.web_egress_status = "stopping"
    if not session.web_egress_stopped_at:
        session.web_egress_stopped_at = timezone.now()
        session.save(
            update_fields=[
                "web_egress_status",
                "web_egress_stopped_at",
                "updated_at",
            ]
        )
    else:
        session.save(update_fields=["web_egress_status", "updated_at"])

    logger.info(
        "[WebEgress] Stop requested during session close - session_id=%s room_id=%s egress_id=%s",
        session.id,
        session.room_id,
        session.web_egress_id,
    )
    return True