import staticAdapter from '@sveltejs/adapter-static';
import fs from 'fs/promises';
import path from 'path';

export default function (options = {}) {
  const baseAdapter = staticAdapter(options);

  return {
    ...baseAdapter,
    /**
     * @param {import("@sveltejs/kit").Builder} builder
     */
    async adapt(builder) {
      await baseAdapter.adapt(builder);

      const buildDir = 'build';
      const chunksDir = path.join(buildDir, '_app', 'immutable', 'chunks');

      const files = await fs.readdir(chunksDir);
      const pathsFile = files.find(f => /^paths-\w+\.js$/.test(f));

      if (pathsFile) {
        const filePath = path.join(chunksDir, pathsFile);
        const newContent = `
          export const base = (typeof window !== 'undefined' && window.__sveltekit_base) || '';
          export const assets = base;
        `;
        await fs.writeFile(filePath, newContent);
      }
    }
  };
};