"""Audit logging middleware for API requests."""
from __future__ import annotations

import logging
import time

import jwt
from starlette.middleware.base import BaseHTTPMiddleware
from starlette.requests import Request
from starlette.responses import Response

audit_logger = logging.getLogger("uvicorn.audit")


def _extract_identity(request: Request) -> str:
    """Extract user email from JWT for audit logging."""
    auth_header = request.headers.get("authorization", "")
    if not auth_header.startswith("Bearer "):
        return "anonymous"
    token = auth_header[7:]
    try:
        payload = jwt.decode(token, options={"verify_signature": False, "verify_exp": False})
        return payload.get("email", "unknown")
    except jwt.PyJWTError:
        return "invalid-token"


def _client_ip(request: Request) -> str:
    """Best-effort client IP."""
    forwarded = request.headers.get("x-forwarded-for")
    if forwarded:
        return forwarded.split(",")[0].strip()
    client = request.client
    return client.host if client else "unknown"


class AuditLogMiddleware(BaseHTTPMiddleware):
    """Logs all /api/ requests with method, path, user, IP, status, and duration."""

    async def dispatch(self, request: Request, call_next) -> Response:  # type: ignore[no-untyped-def]
        path = request.url.path
        if not path.startswith("/api/"):
            return await call_next(request)

        start = time.monotonic()
        identity = _extract_identity(request)
        ip = _client_ip(request)
        query = str(request.query_params) if request.query_params else ""

        response = await call_next(request)

        duration_ms = (time.monotonic() - start) * 1000
        audit_logger.info(
            "API request",
            extra={
                "method": request.method,
                "path": path,
                "query": query,
                "user": identity,
                "ip": ip,
                "status": response.status_code,
                "duration_ms": round(duration_ms, 1),
            },
        )
        return response