"""
Custom exceptions for the Document Translation API
"""
from fastapi import HTTPException


class TranslationError(Exception):
    """Base exception for translation errors"""
    pass


class UnsupportedFileTypeError(TranslationError):
    """Raised when an unsupported file type is provided"""
    pass


class FileSizeLimitExceededError(TranslationError):
    """Raised when a file exceeds the size limit"""
    pass


class LanguageNotSupportedError(TranslationError):
    """Raised when a language code is not supported"""
    pass


class DocumentProcessingError(TranslationError):
    """Raised when there's an error processing the document"""
    pass


def handle_translation_error(error: Exception) -> HTTPException:
    """
    Convert translation errors to HTTP exceptions
    
    Args:
        error: Exception that occurred
    
    Returns:
        HTTPException with appropriate status code and message
    """
    if isinstance(error, UnsupportedFileTypeError):
        return HTTPException(status_code=400, detail=str(error))
    elif isinstance(error, FileSizeLimitExceededError):
        return HTTPException(status_code=413, detail=str(error))
    elif isinstance(error, LanguageNotSupportedError):
        return HTTPException(status_code=400, detail=str(error))
    elif isinstance(error, DocumentProcessingError):
        return HTTPException(status_code=500, detail=str(error))
    else:
        return HTTPException(status_code=500, detail="An unexpected error occurred during translation")