import type { H3Error } from 'h3';

/**
 * Logs server-side errors in a compact, readable format.
 *
 * Nitro fires the `error` hook for every request error, whatever the source
 * (API routes, server routes/middleware, SSR rendering). It also fires for
 * expected HTTP errors like 404s, so anything below a 500 is ignored here.
 */
export default defineNitroPlugin((nitroApp) => {
	nitroApp.hooks.hook('error', (err, { event }) => {
		const error = err as Partial<H3Error>;
		const statusCode = error.statusCode ?? 500;

		// Skip expected client errors (404, 401, 422, redirects, ...).
		if (statusCode < 500) {
			return;
		}

		const where = event ? `${event.method} ${event.path}` : 'non-request';
		const tag = error.unhandled ? '[unhandled]' : '';

		console.error(`[server error] ${tag} ${where} -> ${statusCode} ${err.message}`);

		if (error.data !== undefined) {
			console.error('  data:', error.data);
		}

		if (err.cause) {
			console.error('  cause:', err.cause);
		}

		if (err.stack) {
			// Drop the first line (already printed above as the message).
			console.error(err.stack.split('\n').slice(1).join('\n'));
		}
	});
});