import { createLogger, build } from 'vite';

const end = '?audioworklet';

function bundleAudioWorkletPlugin() /* : PluginOption */ {

  let viteConfig /* : UserConfig */;

  return {

    name: 'vite-plugin-bundle-audioworklet',

    /* apply: 'build', */

    enforce: 'post',

    config(config) {

      viteConfig = config;

    },

    async transform(_code, id) {

      if (!id.endsWith(end)) {

        return;

      }

      const entry = id.replace(end, '');

      const quietLogger = createLogger();

      quietLogger.info = () => undefined;

      const output = await build({

        configFile: false,

        clearScreen: false,

        customLogger: quietLogger,

        build: {

          lib: {

            entry,

            name: '_',

            formats: ['iife'],

          },

          write: false,

        },

      });

      if (!(output instanceof Array)) {

        throw new Error('Expected output to be Array');

      }

      const iife = output[0].output[0].code;

      const encoded = Buffer.from(iife, 'utf8').toString('base64');

      return `export default "data:text/javascript;base64,${encoded}";`;

    },

  };

}

export default bundleAudioWorkletPlugin;