rssume 0.2.0

RSS middleware with AI-powered translation and summarization
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use axum::http::StatusCode;
use axum::response::{IntoResponse, Response};

#[derive(Debug, thiserror::Error)]
pub enum AppError {
    #[error("config error: {0}")]
    Config(String),
    #[error("io error: {0}")]
    Io(#[from] std::io::Error),
    #[error("storage error: {0}")]
    Storage(String),
    #[error("rss fetch error: {0}")]
    Fetch(String),
    #[error("rss parse error: {0}")]
    Parse(String),
    #[error("llm api error: {0}")]
    Llm(String),
    #[error("not found: {0}")]
    NotFound(String),
}

impl From<toml::de::Error> for AppError {
    fn from(e: toml::de::Error) -> Self {
        AppError::Config(e.to_string())
    }
}

impl From<toml::ser::Error> for AppError {
    fn from(e: toml::ser::Error) -> Self {
        AppError::Config(e.to_string())
    }
}

impl From<tera::Error> for AppError {
    fn from(e: tera::Error) -> Self {
        AppError::Storage(format!("template: {}", e))
    }
}

impl IntoResponse for AppError {
    fn into_response(self) -> Response {
        let (status, msg) = match &self {
            AppError::NotFound(_) => (StatusCode::NOT_FOUND, self.to_string()),
            _ => (StatusCode::INTERNAL_SERVER_ERROR, self.to_string()),
        };
        (status, msg).into_response()
    }
}