const fs = require('fs');
const path = require('path');
const rollup = require('rollup');
const babel = require('rollup-plugin-babel');
const resolve = require('rollup-plugin-node-resolve');
const commonjs = require('rollup-plugin-commonjs');
const banner = require('bannerjs');
const zlib = require('zlib');
const pkg = require('../package.json');
const uglify = require('uglify-js');
require('colors-cli/toxic');

// see below for details on the options
const inputOptions = {
  input: 'src/main.js',
  plugins: [
    resolve(), // so Rollup can find `ms`
    commonjs(), // so Rollup can convert `ms` to an ES module
    babel({
      exclude: 'node_modules/**' // 只编译我们的源代码
    })
  ]
};

const outputOptions = {
  file: pkg.unpkg,
  sourcemap: false,
  format: 'umd',
  name: 'hotkeys',
  banner: banner.multibanner()
};

async function build() {
  // create a bundle
  const bundle = await rollup.rollup(inputOptions);

  const uglifyOption = {
    'compress': {
      'pure_getters': true,
      'unsafe': true,
      'unsafe_comps': true,
      'warnings': false
    },
    'output': {
      'ascii_only': true,
    }
  }

  // console.log(bundle.imports); // an array of external dependencies
  // console.log(bundle.exports); // an array of names exported by the entry point
  // console.log(bundle.modules); // an array of module objects

  const umd = await bundle.generate({
    format: 'umd',
    name: 'hotkeys',
    banner: banner.multibanner()
  });

  const umdMinified = banner.onebanner() + '\n' + uglify.minify(umd.code, uglifyOption).code;
  const common = await bundle.generate({
    format: 'cjs',
    name: 'hotkeys',
    banner: banner.multibanner()
  });
  const commonMinified = banner.onebanner() + '\n' + uglify.minify(common.code, uglifyOption).code;

  write('dist/hotkeys.js', umd.code)
    .then(() => write('dist/hotkeys.min.js', umdMinified, true))
    .then(() => write('dist/hotkeys.common.js', common.code))
    .then(() => write('dist/hotkeys.common.min.js', commonMinified, true));

}

build();

function write(dest, code, zip) {
  return new Promise(function (resolve, reject) {
    function report(extra) {
      console.log((path.relative(process.cwd(), dest)).blue_bt + ' ' + getSize(code).green_bt + (extra || ''))
      resolve()
    }
    if (!fs.existsSync(path.dirname(dest))) {
      fs.mkdirSync(path.dirname(dest));
    }
    fs.writeFile(dest, code, function (err) {
      if (err) return reject(err)
      if (zip) {
        zlib.gzip(code, (err, zipped) => {
          if (err) return reject(err)
          report(' (gzipped: ' + getSize(zipped).green_bt + ')')
        })
      } else {
        report()
      }
    })
  })
}

function getSize(code) {
  return (code.length / 1024).toFixed(2) + 'kb'
}