"""HTTP request logging middleware."""

import asyncio
import logging
import time
from starlette.middleware.base import BaseHTTPMiddleware
from starlette.requests import Request
from starlette.responses import Response

logger = logging.getLogger(__name__)

# Paths that should not be logged
_SKIP_PREFIXES = ("/assets", "/ws")
_SKIP_PATHS = ("/favicon.ico",)


class LoggingMiddleware(BaseHTTPMiddleware):
    """Logs every HTTP request to the database via db_schema.insert_http_log.

    - Skips static assets, WebSocket, and favicon paths.
    - Measures request duration in milliseconds.
    - Extracts username from request.state.user when available.
    - Writes logs asynchronously (non-blocking).
    - Never lets logging failures break a request.
    """

    async def dispatch(self, request: Request, call_next) -> Response:
        path = request.url.path

        # Skip paths that should not be logged
        if path in _SKIP_PATHS or any(path.startswith(p) for p in _SKIP_PREFIXES):
            return await call_next(request)

        start = time.perf_counter()
        status_code = 500  # default if call_next raises
        try:
            response = await call_next(request)
            status_code = response.status_code
            return response
        finally:
            duration_ms = (time.perf_counter() - start) * 1000
            method = request.method
            user = getattr(request.state, "user", None)
            ip = request.client.host if request.client else None

            # Fire-and-forget: never block the response
            asyncio.create_task(
                self._write_log(method, path, status_code, duration_ms, user, ip)
            )

    @staticmethod
    async def _write_log(
        method: str,
        path: str,
        status_code: int,
        duration_ms: float,
        user: str | None,
        ip: str | None,
    ) -> None:
        """Write the log entry in a thread executor to avoid blocking."""
        try:
            loop = asyncio.get_event_loop()
            await loop.run_in_executor(
                None,
                lambda: _db_insert(method, path, status_code, duration_ms, user, ip),
            )
        except Exception:
            # Logging must never break the request
            logger.debug("Failed to write HTTP log", exc_info=True)


def _db_insert(
    method: str,
    path: str,
    status_code: int,
    duration_ms: float,
    user: str | None,
    ip: str | None,
) -> None:
    """Synchronous DB insert — called inside run_in_executor."""
    try:
        from web.backend.services.db_schema import insert_http_log

        insert_http_log(
            method=method,
            path=path,
            status_code=status_code,
            duration_ms=duration_ms,
            user=user,
            ip=ip,
        )
    except Exception:
        logger.debug("DB insert_http_log failed", exc_info=True)