"""
Custom exceptions for the Document Translation API
"""

from typing import Any, Dict, Optional


class TranslationError(Exception):
    """
    Base exception for translation errors.
    Includes an error code and optional details for structured JSON responses.
    """

    def __init__(
        self,
        message: str,
        code: str = "TRANSLATION_ERROR",
        details: Optional[Dict[str, Any]] = None,
    ):
        self.message = message
        self.code = code
        self.details = details or {}
        super().__init__(message)


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

    def __init__(
        self,
        message: str = "Format de fichier non supporté.",
        details: Optional[Dict[str, Any]] = None,
    ):
        super().__init__(message, code="INVALID_FORMAT", details=details)


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

    def __init__(
        self,
        message: str = "Fichier trop volumineux.",
        details: Optional[Dict[str, Any]] = None,
    ):
        super().__init__(message, code="FILE_TOO_LARGE", details=details)


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

    def __init__(
        self,
        message: str = "Langue non supportée.",
        details: Optional[Dict[str, Any]] = None,
    ):
        super().__init__(message, code="INVALID_FORMAT", details=details)


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

    def __init__(
        self,
        message: str = "Erreur lors du traitement du document.",
        details: Optional[Dict[str, Any]] = None,
    ):
        super().__init__(message, code="INTERNAL_ERROR", details=details)


class TranslationProviderError(TranslationError):
    """Raised when a translation provider returns a structured error."""

    def __init__(
        self, error_code: str, message: str, details: Optional[Dict[str, Any]] = None
    ):
        super().__init__(message, code=error_code, details=details)


class GlossaryNotFoundError(TranslationError):
    """Raised when a glossary is not found or doesn't belong to the user.
    
    Story 3.10: Glossaires - Application lors Traduction LLM
    """

    def __init__(
        self,
        message: str = "Glossaire introuvable ou vous n'avez pas accès à cette ressource.",
        details: Optional[Dict[str, Any]] = None,
    ):
        super().__init__(message, code="GLOSSARY_NOT_FOUND", details=details)


class PromptNotFoundError(TranslationError):
    """Raised when a prompt is not found or doesn't belong to the user.
    
    Story 3.12: Custom Prompts - Application lors Traduction LLM
    """

    def __init__(
        self,
        message: str = "Prompt introuvable ou vous n'avez pas accès à cette ressource.",
        details: Optional[Dict[str, Any]] = None,
    ):
        super().__init__(message, code="PROMPT_NOT_FOUND", details=details)


# Map provider error codes to HTTP status (Story 2.2, 2.3, 2.6)
_PROVIDER_ERROR_HTTP_STATUS = {
    "GOOGLE_QUOTA_EXCEEDED": 429,
    "GOOGLE_INVALID_KEY": 401,
    "GOOGLE_NETWORK_ERROR": 502,
    "GOOGLE_UNSUPPORTED_LANGUAGE": 400,
    "GOOGLE_TEXT_TOO_LONG": 413,
    "ALL_PROVIDERS_FAILED": 502,
}


def handle_translation_error(error: TranslationError) -> tuple[dict, int]:
    """
    Handle a translation error and return a tuple of (response_body, status_code).

    Args:
        error: The TranslationError to handle

    Returns:
        Tuple of (error response dict, HTTP status code)
    """
    status_code = _PROVIDER_ERROR_HTTP_STATUS.get(error.code, 400)

    response = {
        "error": error.code,
        "message": error.message,
        "details": error.details if error.details else {},
    }

    return response, status_code
