"""
Request ID middleware for tracking requests across services
"""
import uuid
from fastapi import Request
from starlette.middleware.base import BaseHTTPMiddleware
from starlette.responses import Response
from ..config.logging_config import get_logger

logger = get_logger(__name__)


class RequestIDMiddleware(BaseHTTPMiddleware):
    """Add unique request ID to each request for tracing"""
    
    async def dispatch(self, request: Request, call_next):
        # Generate or get request ID
        request_id = request.headers.get("X-Request-ID") or str(uuid.uuid4())
        
        # Add request ID to request state
        request.state.request_id = request_id
        
        # Log request
        logger.info(
            f"Request started: {request.method} {request.url.path}",
            extra={
                "request_id": request_id,
                "method": request.method,
                "path": request.url.path,
                "client_ip": request.client.host if request.client else None
            }
        )
        
        # Process request
        try:
            response = await call_next(request)
            
            # Add request ID to response headers
            response.headers["X-Request-ID"] = request_id
            
            # Log response
            logger.info(
                f"Request completed: {request.method} {request.url.path} - {response.status_code}",
                extra={
                    "request_id": request_id,
                    "method": request.method,
                    "path": request.url.path,
                    "status_code": response.status_code
                }
            )
            
            return response
        except Exception as e:
            logger.error(
                f"Request failed: {request.method} {request.url.path} - {str(e)}",
                extra={
                    "request_id": request_id,
                    "method": request.method,
                    "path": request.url.path,
                    "error": str(e)
                },
                exc_info=True
            )
            raise