import svelte from 'rollup-plugin-svelte';
import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
import livereload from 'rollup-plugin-livereload';
import { terser } from 'rollup-plugin-terser';

const production = !process.env.ROLLUP_WATCH;

export default {
  'input': 'src/main.js',
  'output': {
    'sourcemap': false,
    'format': 'iife',
    'name': 'app',
    'file': 'public/build/bundle.js'
  },
  'plugins': [
    svelte({
      // enable run-time checks when not in production
      'dev': !production,
      // we'll extract any component CSS out into
      // a separate file - better for performance
      'css': css => {
        css.write('public/build/bundle.css');
      }
    }),

    // If you have external dependencies installed from
    // npm, you'll most likely need these plugins. In
    // some cases you'll need additional configuration -
    // consult the documentation for details:
    // https://github.com/rollup/plugins/tree/master/packages/commonjs
    resolve({
      'browser': true,
      'dedupe': ['svelte']
    }),
    commonjs(),

    // In dev mode, call `npm run start` once
    // the bundle has been generated
    !production && serve(),

    // Watch the `public` directory and refresh the
    // browser on changes when not in production
    !production && livereload('public'),

    // If we're building for production (npm run build
    // instead of npm run dev), minify
    production && terser()
  ],
  'watch': {
    'clearScreen': false
  }
};

function serve() {
  let started = false;

  return {
    writeBundle() {
      if (!started) {
        started = true;

        require('child_process').spawn('npm', ['run', 'start', '--', '--dev'], {
          'stdio': ['ignore', 'inherit', 'inherit'],
          'shell': true
        });
      }
    }
  };
}