use axum::http::StatusCode;
use axum::response::{IntoResponse, Response};

#[derive(Debug, thiserror::Error)]
pub enum Error {
    #[error("not found")]
    NotFound,
    #[error("bad request: {0}")]
    BadRequest(String),
    #[error(transparent)]
    Db(#[from] sqlx::Error),
    #[error(transparent)]
    Other(#[from] anyhow::Error),
}

impl IntoResponse for Error {
    fn into_response(self) -> Response {
        // Client errors carry their (already user-facing) message; server errors
        // are logged in full but return a generic body so internal detail (SQL
        // text, anyhow chains, file paths) never leaks to the client.
        let (status, message) = match &self {
            Error::NotFound => (StatusCode::NOT_FOUND, "not found".to_string()),
            Error::BadRequest(m) => (StatusCode::BAD_REQUEST, m.clone()),
            Error::Db(e) => {
                tracing::error!(error = %e, "internal db error");
                (
                    StatusCode::INTERNAL_SERVER_ERROR,
                    "internal server error".to_string(),
                )
            }
            Error::Other(e) => {
                tracing::error!(error = format!("{e:#}"), "internal error");
                (
                    StatusCode::INTERNAL_SERVER_ERROR,
                    "internal server error".to_string(),
                )
            }
        };
        (status, axum::Json(serde_json::json!({ "error": message }))).into_response()
    }
}

pub type Result<T> = std::result::Result<T, Error>;