app/core/exceptions.py

from __future__ import annotations

from typing import Any


class MediaAPIError(Exception):
    """A safe, client-facing application error."""

    code = "MEDIA_API_ERROR"
    status_code = 400

    def __init__(self, message: str, details: Any | None = None) -> None:
        super().__init__(message, details)
        self.message = message
        self.details = details

    def __str__(self) -> str:
        return self.message


class InputError(MediaAPIError):
    code = "INVALID_INPUT"
    status_code = 422


class DownloadError(MediaAPIError):
    code = "DOWNLOAD_FAILED"
    status_code = 400


class ProcessingError(MediaAPIError):
    code = "PROCESSING_FAILED"
    status_code = 422


class NotFoundError(MediaAPIError):
    code = "NOT_FOUND"
    status_code = 404


class TemplateNotFoundError(MediaAPIError):
    """Raised when a requested template reference is unavailable."""

    code = "TEMPLATE_NOT_FOUND"
    status_code = 404


class TemplateValidationError(MediaAPIError):
    """Raised when a template definition or runtime parameter is invalid."""

    code = "INVALID_TEMPLATE"
    status_code = 422


class TemplateExecutionError(MediaAPIError):
    """Raised when a validated template cannot produce its declared output."""

    code = "TEMPLATE_EXECUTION_FAILED"
    status_code = 422