import * as fs from 'fs';
import * as path from 'path';
import sade from 'sade';
import colors from 'kleur';
import prettyMs from 'pretty-ms';
import * as pkg from '../package.json';

const prog = sade('sapper').version(pkg.version);

prog.command('dev')
	.describe('Start a development server')
	.option('-p, --port', 'Specify a port')
	.option('-o, --open', 'Open a browser window')
	.option('--dev-port', 'Specify a port for development server')
	.option('--hot', 'Use hot module replacement (requires webpack)', true)
	.option('--live', 'Reload on changes if not using --hot', true)
	.option('--bundler', 'Specify a bundler (rollup or webpack)')
	.action(async (opts: {
		port: number,
		open: boolean,
		'dev-port': number,
		live: boolean,
		hot: boolean,
		bundler?: string
	}) => {
		const { dev } = await import('./cli/dev');
		dev(opts);
	});

prog.command('build [dest]')
	.describe('Create a production-ready version of your app')
	.option('-p, --port', 'Default of process.env.PORT', '3000')
	.option('--bundler', 'Specify a bundler (rollup or webpack, blank for auto)')
	.option('--legacy', 'Create separate legacy build')
	.example(`build custom-dir -p 4567`)
	.action(async (dest = 'build', opts: {
		port: string,
		legacy: boolean,
		bundler?: string
	}) => {
		console.log(`> Building...`);

		process.env.NODE_ENV = process.env.NODE_ENV || 'production';
		process.env.SAPPER_DEST = dest;

		const start = Date.now();

		try {
			const { build } = await import('./cli/build');
			await build(opts);

			const launcher = path.resolve(dest, 'index.js');

			fs.writeFileSync(launcher, `
				// generated by sapper build at ${new Date().toISOString()}
				process.env.NODE_ENV = process.env.NODE_ENV || 'production';
				process.env.SAPPER_DEST = __dirname;
				process.env.PORT = process.env.PORT || ${opts.port || 3000};

				console.log('Starting server on port ' + process.env.PORT);
				require('./server.js');
			`.replace(/^\t+/gm, '').trim());

			console.error(`\n> Finished in ${elapsed(start)}. Type ${colors.bold.cyan(`node ${dest}`)} to run the app.`);
		} catch (err) {
			console.log(`${colors.bold.red(`> ${err.message}`)}`);
			process.exit(1);
		}
	});

prog.command('start [dir]')
	.describe('Start your app')
	.option('-p, --port', 'Specify a port')
	.option('-o, --open', 'Open a browser window')
	.action(async (dir = 'build', opts: { port: number, open: boolean }) => {
		const { start } = await import('./cli/start');
		start(dir, opts);
	});

prog.command('export [dest]')
	.describe('Export your app as static files (if possible)')
	.option('--build', '(Re)build app before exporting', true)
	.option('--build-dir', 'Specify a custom temporary build directory', '.sapper/prod')
	.option('--basepath', 'Specify a base path')
	.option('--timeout', 'Milliseconds to wait for a page (--no-timeout to disable)', 5000)
	.option('--legacy', 'Create separate legacy build')
	.option('--bundler', 'Specify a bundler (rollup or webpack, blank for auto)')
	.action(async (dest = 'export', opts: {
		build: boolean,
		legacy: boolean,
		bundler?: string,
		'build-dir': string,
		basepath?: string,
		timeout: number | false
	}) => {
		process.env.NODE_ENV = 'production';
		process.env.SAPPER_DEST = opts['build-dir'];

		const start = Date.now();

		try {
			if (opts.build) {
				console.log(`> Building...`);
				const { build } = await import('./cli/build');
				await build(opts);
				console.error(`\n> Built in ${elapsed(start)}`);
			}

			const { exporter } = await import('./cli/export');
			await exporter(dest, opts);
			console.error(`\n> Finished in ${elapsed(start)}. Type ${colors.bold.cyan(`npx serve ${dest}`)} to run the app.`);
		} catch (err) {
			console.error(colors.bold.red(`> ${err.message}`));
			process.exit(1);
		}
	});

// TODO upgrade

prog.parse(process.argv);

function elapsed(start: number) {
	return prettyMs(Date.now() - start);
}