// Resolve client config from CLI args or environment variables.
// Precedence: CLI args > env vars > error
//
// Env vars:
//   CCC_SECRETS  path to secrets file
//   CCC_USER     username to authenticate as

import { readFileSync } from 'fs';

function get_arg(argv, flag) {
	const i = argv.indexOf(flag);
	return i !== -1 ? argv[i + 1] : null;
}

export function load_client_config(argv) {
	const secrets_path = get_arg(argv, '--secrets') || process.env.CCC_SECRETS;
	const username     = get_arg(argv, '--user')    || process.env.CCC_USER;

	if (!secrets_path) {
		console.error('Secrets file required: --secrets <path> or CCC_SECRETS=<path>');
		process.exit(1);
	}
	if (!username) {
		console.error('Username required: --user <name> or CCC_USER=<name>');
		process.exit(1);
	}

	let secrets;
	try {
		secrets = JSON.parse(readFileSync(secrets_path, 'utf8'));
	} catch (err) {
		console.error(`Cannot read secrets file: ${err.message}`);
		process.exit(1);
	}

	const user_entry = secrets.users?.[username];
	if (!user_entry) {
		console.error(`User '${username}' not found in secrets file`);
		process.exit(1);
	}

	return { username, secret: user_entry.secret };
}

export function get_remaining(argv) {
	const result = [];
	let i = 2;
	while (i < argv.length) {
		if (argv[i] === '--secrets' || argv[i] === '--user') {
			i += 2;
		} else {
			result.push(argv[i]);
			i++;
		}
	}
	return result;
}