server/src/error.rs

use serde::Serialize;
use thiserror::Error;

#[derive(Error, Debug)]
pub enum AppError {
    #[error("Network error: {0}")]
    Network(#[from] reqwest::Error),

    #[error("IO error: {0}")]
    Io(#[from] std::io::Error),

    #[error("JSON error: {0}")]
    Json(#[from] serde_json::Error),

    #[error("OAuth error: {0}")]
    OAuth(String),

    #[error("Configuration error: {0}")]
    Config(String),

    #[error("Account error: {0}")]
    Account(String),

    #[error("Proxy error: {0}")]
    Proxy(String),

    #[error("Unknown error: {0}")]
    Unknown(String),
}

// Implement Serialize for API responses
impl Serialize for AppError {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: serde::Serializer,
    {
        serializer.serialize_str(self.to_string().as_str())
    }
}

// Result type alias
pub type AppResult<T> = Result<T, AppError>;

// Implement IntoResponse for Axum
impl axum::response::IntoResponse for AppError {
    fn into_response(self) -> axum::response::Response {
        let status = match &self {
            AppError::Network(_) => axum::http::StatusCode::BAD_GATEWAY,
            AppError::Io(_) => axum::http::StatusCode::INTERNAL_SERVER_ERROR,
            AppError::Json(_) => axum::http::StatusCode::BAD_REQUEST,
            AppError::OAuth(_) => axum::http::StatusCode::UNAUTHORIZED,
            AppError::Config(_) => axum::http::StatusCode::BAD_REQUEST,
            AppError::Account(_) => axum::http::StatusCode::NOT_FOUND,
            AppError::Proxy(_) => axum::http::StatusCode::SERVICE_UNAVAILABLE,
            AppError::Unknown(_) => axum::http::StatusCode::INTERNAL_SERVER_ERROR,
        };

        let body = serde_json::json!({
            "success": false,
            "error": self.to_string()
        });

        (status, axum::Json(body)).into_response()
    }
}