import esbuild from 'esbuild';
import { fileURLToPath } from 'node:url';
import { dirname, resolve } from 'node:path';

const watch = process.argv.includes('--watch');
const __dirname = dirname(fileURLToPath(import.meta.url));

// isomorphic-git's `.` subpath export only points at the CJS build, which
// does a top-level `require('crypto')` that esbuild can't bundle for the
// browser. The package ships an ESM entry at ./index.js but the exports
// map hides it. Redirect the bare specifier to the ESM file by hand.
const isogitEsmPlugin = {
  name: 'isogit-esm',
  setup(build) {
    const esmEntry = resolve(__dirname, 'node_modules/isomorphic-git/index.js');
    build.onResolve({ filter: /^isomorphic-git$/ }, () => ({ path: esmEntry }));
  },
};

const common = {
  bundle: true,
  format: 'iife',
  target: ['firefox115'],
  platform: 'browser',
  mainFields: ['browser', 'module', 'main'],
  conditions: ['browser', 'import', 'default'],
  logLevel: 'info',
  sourcemap: true,
  minify: false,
  define: {
    'process.env.NODE_ENV': '"production"',
    'global': 'globalThis',
  },
  plugins: [isogitEsmPlugin],
};

// Only the background bundle pulls in isomorphic-git and therefore needs
// the Buffer polyfill. popup/options talk to the background via runtime
// messages and stay tiny.
const polyfillInject = [resolve(__dirname, 'src/common/polyfills.ts')];

const entries = [
  { entryPoints: ['src/background/index.ts'], outfile: 'build/background.js', inject: polyfillInject },
  { entryPoints: ['src/popup/popup.ts'], outfile: 'build/popup.js' },
  { entryPoints: ['src/options/options.ts'], outfile: 'build/options.js' },
];

if (watch) {
  for (const e of entries) {
    const ctx = await esbuild.context({ ...common, ...e });
    await ctx.watch();
  }
  console.log('watching…');
} else {
  await Promise.all(entries.map(e => esbuild.build({ ...common, ...e })));
  console.log('build ok');
}