"""Typed application errors."""
from __future__ import annotations

from dataclasses import dataclass
from typing import Any


@dataclass
class AppError(Exception):
    """Base application error with a code and message."""

    code: str
    message: str
    details: dict[str, Any] | None = None


class ValidationError(AppError):
    """Raised when client input is invalid."""


class SpeechError(AppError):
    """Raised when STT/TTS fails."""


class LLMError(AppError):
    """Raised when LLM call fails."""