"""Custom exception handler that returns consistent JSON error responses."""
from rest_framework.views import exception_handler


def custom_exception_handler(exc, context):
    """Wrap DRF's default handler to always return {'detail': ..., 'code': ...}."""
    response = exception_handler(exc, context)
    if response is not None:
        data = response.data
        # Flatten validation errors into a consistent shape
        if isinstance(data, dict) and "detail" not in data:
            response.data = {"detail": "Validation error", "fields": data, "code": "validation_error"}
    return response