"""Custom exceptions for LLM adapters."""

from fastapi import HTTPException


class LLMError(Exception):
    """Base exception for all LLM-related errors."""

    def __init__(self, message: str, status_code: int = 500):
        self.message = message
        self.status_code = status_code
        super().__init__(message)


class LLMAuthenticationError(LLMError):
    """Raised when API authentication fails."""

    def __init__(self, message: str = "LLM authentication failed"):
        super().__init__(message, status_code=401)


class LLMRateLimitError(LLMError):
    """Raised when rate limit is exceeded."""

    def __init__(self, message: str = "LLM rate limit exceeded"):
        super().__init__(message, status_code=429)


class LLMConnectionError(LLMError):
    """Raised when connection to LLM service fails."""

    def __init__(self, message: str = "Could not connect to LLM service"):
        super().__init__(message, status_code=503)


class LLMConfigurationError(LLMError):
    """Raised when LLM configuration is invalid."""

    def __init__(self, message: str = "Invalid LLM configuration"):
        super().__init__(message, status_code=500)


class LLMResponseError(LLMError):
    """Raised when LLM returns an invalid or unexpected response."""

    def __init__(self, message: str = "Invalid response from LLM"):
        super().__init__(message, status_code=502)


def llm_exception_to_http(exc: LLMError) -> HTTPException:
    """Convert an LLMError to a FastAPI HTTPException.

    Args:
        exc: The LLMError to convert

    Returns:
        An HTTPException with appropriate status code and detail
    """
    return HTTPException(status_code=exc.status_code, detail=exc.message)