import process from 'node:process';
import { z } from 'zod';

export const ServerConfig = z.object({
	port: z.coerce.number().default(3000),
	prefix: z.coerce.string().optional(), // will ensure start with `/`
	origin: z.coerce.string().optional(), // no prefix
	url: z.coerce.string().optional(), // with prefix
});
export type ServerConfig = z.infer<typeof ServerConfig>;

export function getServerConfig(_env = process.env) {
	const { PORT, SERVER_PORT = PORT, SERVER_PREFIX, SERVER_ORIGIN, SERVER_URL } = process.env;

	const data = { port: SERVER_PORT, prefix: SERVER_PREFIX, origin: SERVER_ORIGIN, url: SERVER_URL };
	if (data.prefix && !data.prefix.startsWith('/')) {
		data.prefix = `/${data.prefix}`;
	}

	if (!data.url && data.origin) {
		const u = new URL(data.origin);
		u.pathname = data.prefix || '';
		data.url = u.toString();
	}

	if (data.url && !data.origin) {
		const u = new URL(data.url);
		data.origin = u.origin;
	}

	return ServerConfig.parse(data);
}