Holzleitner---Backend--aktuell-/crates/api/src/error.rs

use axum::Json;
use axum::http::StatusCode;
use axum::response::{IntoResponse, Response};
use holzleitner_application::error::ApplicationError;
use holzleitner_application::ports::AuthError;
use serde_json::json;

/// HTTP-Adapter für Application-Fehler. Mappt jede Variante auf
/// einen Statuscode + JSON-Body. Verhindert, dass interne Details
/// (z. B. SQL-Fehler) versehentlich in die Antwort durchschlagen —
/// das eigentliche Detail wird über `tracing` geloggt.
pub struct ApiError(pub ApplicationError);

impl From<ApplicationError> for ApiError {
    fn from(value: ApplicationError) -> Self {
        Self(value)
    }
}

impl From<AuthError> for ApiError {
    fn from(err: AuthError) -> Self {
        // Auth-Detail für Debugging loggen, aber NICHT an den Client geben —
        // dort sehen wir nur „Unauthorized" / „internal error".
        tracing::debug!(error = %err, "auth verification failed");
        ApiError(err.into())
    }
}

impl IntoResponse for ApiError {
    fn into_response(self) -> Response {
        let (status, code) = match &self.0 {
            ApplicationError::NotFound => (StatusCode::NOT_FOUND, "not_found"),
            ApplicationError::Unauthorized => (StatusCode::UNAUTHORIZED, "unauthorized"),
            ApplicationError::Forbidden => (StatusCode::FORBIDDEN, "forbidden"),
            ApplicationError::Validation(_) => (StatusCode::BAD_REQUEST, "validation"),
            ApplicationError::Conflict(_) => (StatusCode::CONFLICT, "conflict"),
            ApplicationError::Repository(_)
            | ApplicationError::External(_)
            | ApplicationError::Unexpected(_) => {
                tracing::error!(error = %self.0, "internal error");
                (StatusCode::INTERNAL_SERVER_ERROR, "internal_error")
            }
        };

        let body = Json(json!({
            "error": code,
            "message": self.0.to_string(),
        }));

        (status, body).into_response()
    }
}