import logging
import uuid

from django.utils.deprecation import MiddlewareMixin
from .local_storage import set_current_trace_id, get_current_trace_id

logger = logging.getLogger(__name__)

class LoggingMiddleware(MiddlewareMixin):
    def process_request(self, request):
        trace_id = request.headers.get('X-Trace-ID', str(uuid.uuid4()))
        request.META['X-Trace-ID'] = trace_id
        set_current_trace_id(trace_id)

        request_body = ""
        content_type = request.headers.get("Content-Type", "")
        if request.method in ('POST', 'PUT', 'PATCH') and not content_type.startswith("multipart/form-data"):
            request_body = request.body.decode(encoding="utf-8", errors="ignore")

        logger.info(f"Request: {request.method} {request.path} | Trace ID: {trace_id} | "
                    f"Body: {request_body} | Headers: {request.headers}")

    def process_response(self, request, response):
        trace_id = request.META.get('X-Trace-ID', str(uuid.uuid4()))
        try:
            response_body = response.content.decode("utf-8") if response.content else ""
        except Exception as e:
            logger.error(e)
            response_body = ""

        logger.info(f"Response: {request.method} {request.path} | Trace ID: {trace_id} | "
                    f"Status: {response.status_code} | Body: {response_body}")

        response['X-Trace-ID'] = trace_id
        return response

    def process_exception(self, request, exception):
        trace_id = request.META.get('X-Trace-ID', str(uuid.uuid4()))
        logger.error(f"Exception: {request.method} {request.path} | Trace ID: {trace_id} | "
                     f"Error: {exception}")
        
class TraceIDLogFilter(logging.Filter):
    def filter(self, record):
        trace_id = get_current_trace_id()
        record.trace_id = trace_id
        return True