// Disposable drill fixture. Marker files simulate observations, not a real DB or deadlock.
import { createServer } from 'node:http';
import { existsSync } from 'node:fs';
import { pathToFileURL } from 'node:url';

import { statusFor } from './health.ts';
export { statusFor } from './health.ts';

/** @param {() => import('./health.ts').HealthState} readState */
export function createFixtureServer(readState) {
	return createServer((request, response) => {
		const status = statusFor(request.url, readState());
		response.writeHead(status, {
			'Content-Type': 'text/plain',
			'Cache-Control': 'no-store',
			'X-Replica': process.env.HOSTNAME ?? 'local'
		});
		response.end(status === 200 ? 'ok\n' : 'unavailable\n');
	});
}

if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) {
	const startedAt = Date.now();
	createFixtureServer(() => ({
		initialized: Date.now() - startedAt >= Number(process.env.STARTUP_MS ?? 50000),
		stuck: existsSync('/tmp/stuck'),
		databaseDown: existsSync('/tmp/database-down')
	})).listen(Number(process.env.PORT ?? 8080), '0.0.0.0');
}