import { Argv } from 'yargs';
import { resolve } from 'path';

const DEFAULT_PORT = 3000 as const;

const buildApp = async () => {
	process.stdout.write('Building app...\n');

	const cwd = resolve(__dirname, '..', '..', '..');
	const nextBinPath = resolve(__dirname, '..', '..', '..', 'node_modules', '.bin', 'next');
	const { execa } = await import('execa');

	await execa(nextBinPath, ['build'], {
		stdout: 'inherit',
		stderr: 'inherit',
		cwd,
	});

	process.stdout.write('done\n');
};

const serveApp = async (port: number) => {
	process.stdout.write(`Using port: ${port}...\n`);
	process.stdout.write('Serving app...\n');

	const cwd = resolve(__dirname, '..', '..', '..');
	const nextBinPath = resolve(__dirname, '..', '..', '..', 'node_modules', '.bin', 'next');
	const { execa } = await import('execa');

	await execa(nextBinPath, ['start', '-p', port.toString()], {
		stdout: 'inherit',
		stderr: 'inherit',
		cwd,
	});
};

export const description = 'Start a development server' as const;

export enum ServeReturnCode {
	SUCCESS = 0,
}

export interface ServeArgs {
	port?: number;
	subcommands?: string[];
}

export const builder = (yargs: Argv) => yargs
	.option('port', {
		type: 'number',
		default: DEFAULT_PORT,
		alias: 'p',
	});

const serve = async (args: ServeArgs) => {
	const {
		port = DEFAULT_PORT,
	} = args;

	await buildApp();
	await serveApp(port);
	return ServeReturnCode.SUCCESS;
};

export default serve;