import { v4 as uuidv4 } from 'uuid';
import { PackageJSON } from '../types/packages';
import { Plugin } from 'rollup';
import indexJSBuilder from '../utils/index-js-builder';
import { readFileSync } from 'fs';
import path from 'path';

export const INPUT_FILE = `${uuidv4()}.js`;

export function packageBuilder(opts: { entry: string }): Plugin {
  const pkg: PackageJSON = JSON.parse(readFileSync('./package.json').toString('utf-8'));
  const indexHtmlSource = readFileSync(
    path.join(__dirname, '../utils/default-package-index.html')
  ).toString('utf-8');

  return {
    name: 'Studio Package Builder Rollup Plugin',
    resolveId(id): string | null {
      if (id === INPUT_FILE) {
        return id;
      }

      return null;
    },
    async load(id): Promise<string | null> {
      if (id === INPUT_FILE) {
        return indexJSBuilder(pkg, opts.entry);
      }

      return null;
    },
    generateBundle() {
      this.emitFile({
        type: 'asset',
        fileName: 'index.html',
        source: indexHtmlSource
      });
    }
  };
}