const fs = require( 'fs' );
var Terser = require("terser");

var files = [ 'src/impress.js' ];
// Libraries from src/lib
files.push( 'src/lib/gc.js', 'src/lib/util.js', 'src/lib/rotation.js' );
// Plugins from src/plugins
files.push( 'src/plugins/autoplay/autoplay.js',
           'src/plugins/blackout/blackout.js',
           'src/plugins/extras/extras.js',
           'src/plugins/form/form.js',
           'src/plugins/fullscreen/fullscreen.js',
           'src/plugins/goto/goto.js',
           'src/plugins/help/help.js',
           'src/plugins/impressConsole/impressConsole.js',
           'src/plugins/media/media.js',
           'src/plugins/mobile/mobile.js',
           'src/plugins/mouse-timeout/mouse-timeout.js',
           'src/plugins/navigation/navigation.js',
           'src/plugins/navigation-ui/navigation-ui.js',
           'src/plugins/progress/progress.js',
           'src/plugins/rel/rel.js',
           'src/plugins/resize/resize.js',
           'src/plugins/skip/skip.js',
           'src/plugins/stop/stop.js',
           'src/plugins/substep/substep.js',
           'src/plugins/touch/touch.js',
           'src/plugins/toolbar/toolbar.js' );
var output = files.map( ( f )=>{
  return fs.readFileSync( f ).toString();
}).join( '\n' );

var filename = 'js/impress.js';
fs.writeFileSync( filename, '// This file was automatically generated from files in src/ directory.\n\n' + output );
console.log( filename );

// terser --compress --mangle --comments '/^!/' --source-map --output js/impress.min.js js/impress.js
var code = fs.readFileSync( 'js/impress.js' ).toString();
var options = {
  sourceMap: {
   filename: 'js/impress.js',
   url: 'js/impress.min.js.map'
  },
  output: {
    comments: /^!/
  }
};
var result = Terser.minify( {'js/impress.js': code}, options );

filename = 'js/impress.min.js';
fs.writeFileSync( filename, result.code );
console.log( filename );
filename = 'js/impress.min.js.map';
fs.writeFileSync( filename, result.map );
console.log( filename );