"""
Global exception definitions.
Domain-specific exceptions should be in their respective modules.
"""
from typing import Any


class AppException(Exception):
    """Base exception for all application errors."""
    
    def __init__(
        self,
        message: str = "An error occurred",
        status_code: int = 500,
        details: dict[str, Any] | None = None,
    ):
        self.message = message
        self.status_code = status_code
        self.details = details or {}
        super().__init__(self.message)


class OllamaConnectionError(AppException):
    """Raised when cannot connect to Ollama service."""
    
    def __init__(self, message: str = "Cannot connect to Ollama service"):
        super().__init__(message=message, status_code=503)


class OllamaTimeoutError(AppException):
    """Raised when Ollama request times out."""
    
    def __init__(self, message: str = "Ollama request timed out"):
        super().__init__(message=message, status_code=504)


class ModelNotFoundError(AppException):
    """Raised when requested model is not available."""
    
    def __init__(self, model_name: str):
        super().__init__(
            message=f"Model '{model_name}' not found",
            status_code=404,
            details={"model": model_name}
        )


class ValidationError(AppException):
    """Raised for validation errors."""
    
    def __init__(self, message: str, details: dict[str, Any] | None = None):
        super().__init__(message=message, status_code=422, details=details)