// API, tool, and runtime error types

/// Errors from the API layer (HTTP, JSON, SSE, auth).
#[derive(Clone, Debug, PartialEq)]
pub enum ApiError {
 Http(String),
 Json(String),
 Api(u32, String, bool),
 Sse(String),
 Auth(String),
 RetriesExhausted(u32),
}

impl std::fmt::Display for ApiError {
 fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
 match self {
 ApiError::Http(msg) => write!(f, "Http: {}", msg),
 ApiError::Json(msg) => write!(f, "Json: {}", msg),
 ApiError::Api(status, msg, _retry) => write!(f, "Api({}): {}", status, msg),
 ApiError::Sse(msg) => write!(f, "Sse: {}", msg),
 ApiError::Auth(msg) => write!(f, "Auth: {}", msg),
 ApiError::RetriesExhausted(n) => write!(f, "RetriesExhausted({})", n),
 }
 }
}

/// Errors from tool execution.
#[derive(Clone, Debug, PartialEq)]
pub enum ToolError {
 ExecutionFailed(String),
 InvalidInput(String),
 PermissionDenied(String),
}

impl std::fmt::Display for ToolError {
 fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
 match self {
 ToolError::ExecutionFailed(msg) => write!(f, "ExecutionFailed: {}", msg),
 ToolError::InvalidInput(msg) => write!(f, "InvalidInput: {}", msg),
 ToolError::PermissionDenied(msg) => write!(f, "PermissionDenied: {}", msg),
 }
 }
}

/// Errors from the agent runtime.
#[derive(Clone, Debug, PartialEq)]
pub enum RuntimeError {
 Api(String),
 MaxIterations(u32),
 EmptyResponse,
}

impl std::fmt::Display for RuntimeError {
 fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
 match self {
 RuntimeError::Api(msg) => write!(f, "Api: {}", msg),
 RuntimeError::MaxIterations(n) => write!(f, "MaxIterations({})", n),
 RuntimeError::EmptyResponse => write!(f, "EmptyResponse"),
 }
 }
}