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;

function serve() {
  let server;

  function toExit() {
    if (server) server.kill(0);
  }

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

      process.on('SIGTERM', toExit);
      process.on('exit', toExit);
    }
  };
}

const toRollupConfig = component => {
  return {
    input: `svelte/${component}.js`,
    output: {
      sourcemap: true,
      format: 'iife',
      name: 'app',
      file: `docs/build/${component}.js`
    },
    plugins: [
      svelte({
        // customElement: true,
        // 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(`${component}.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('docs'),

      // If we're building for production (npm run build
      // instead of npm run dev), minify
      production && terser()
    ],
    watch: {
      clearScreen: false
    },
    onwarn: function (warning) {
      // Skip certain warnings

      // should intercept ... but doesn't in some rollup versions
      if (warning.code === 'THIS_IS_UNDEFINED') { return; }

      // console.warn everything else
      console.warn(warning.message);
    }

  }
};


export default [
  toRollupConfig('flashpos'),
  toRollupConfig('flasharb'),
  toRollupConfig('main')
];