import * as esbuild from 'esbuild';
import { existsSync } from 'node:fs';

const entries = [
	'src/lib/server/pipeline/worker-entry.ts',
	'src/lib/server/pipeline/embed-worker-entry.ts'
];

try {
	const existing = entries.filter(e => existsSync(e));
	if (existing.length === 0) {
		console.log('[build-workers] No worker entry files found yet, skipping.');
		process.exit(0);
	}

	await esbuild.build({
		entryPoints: existing,
		bundle: true,
		platform: 'node',
		target: 'node20',
		format: 'esm',
		outdir: 'build/workers',
		outExtension: { '.js': '.mjs' },
		alias: {
			'$lib': './src/lib',
			'$lib/server': './src/lib/server'
		},
		external: ['better-sqlite3', '@xenova/transformers'],
		banner: {
			js: "import { createRequire } from 'module'; const require = createRequire(import.meta.url);"
		}
	});

	console.log(`[build-workers] Compiled ${existing.length} worker(s) to build/workers/`);
} catch (err) {
	console.error('[build-workers] Error:', err);
	process.exit(1);
}