#!/usr/bin/env node
/**
 * Build the Node.js sidecar for Tauri production.
 *
 * Bundles packages/server/src/local/service.ts into a single JS file
 * at app/src-tauri/resources/service.js using esbuild JS API.
 *
 * Usage:
 *   node scripts/build-sidecar.mjs
 */

import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const root = path.resolve(__dirname, '..');
const resourcesDir = path.join(root, 'app', 'src-tauri', 'resources');
const outFile = path.join(resourcesDir, 'service.js');
const entryPoint = path.join(root, 'packages', 'server', 'src', 'local', 'service.ts');
// Metafile goes to a temp path (NOT resources/) so it's neither bundled into
// the app nor left as an untracked repo artifact. stage-sidecar-deps.mjs reads
// it back from the same well-known path. Keep the two in sync.
const metaFile = path.join(os.tmpdir(), 'waggle-sidecar-meta.json');

// Ensure resources directory exists
fs.mkdirSync(resourcesDir, { recursive: true });

console.log('[build-sidecar] Bundling server into', outFile);

// Native modules that can't be bundled — must be installed alongside the sidecar
const EXTERNAL = [
  'better-sqlite3',
  '@vscode/sqlite3',
  'bullmq',
  'ioredis',
  'pg',
  'postgres',
  'drizzle-orm',
  'drizzle-orm/*',
  'mammoth',
  'pdf-parse',
  'exceljs',
  'archiver',
  '@fastify/static',
  '@huggingface/transformers',
  'onnxruntime-node',
  'onnxruntime-common',
  'onnxruntime-web',
  'sharp',
  'playwright-core',
  'playwright-core/*',
  '@playwright/*',
  'chromium-bidi',
  'chromium-bidi/*',
];

try {
  // Dynamic import esbuild (available via vite dependency)
  const esbuild = await import('esbuild');

  const result = await esbuild.build({
    entryPoints: [entryPoint],
    bundle: true,
    platform: 'node',
    target: 'node20',
    format: 'esm',
    outfile: outFile,
    external: EXTERNAL,
    // P4/D12: @waggle/shared and @waggle/hive-mind-core export ONLY their
    // gitignored dist/ (unlike core/agent/server, which export src/*.ts).
    // Without these aliases the bundle silently embeds whatever dist/ was
    // last compiled — the same stale-server-in-the-binary class D12 exists
    // to kill — and a clean checkout can't build at all without
    // build:packages. Alias to source so the bundle ALWAYS compiles from
    // src, like the vitest aliases do. (No subpath imports of either
    // package exist — verified before aliasing the bare names.)
    alias: {
      '@waggle/shared': path.join(root, 'packages', 'shared', 'src', 'index.ts'),
      '@waggle/hive-mind-core': path.join(root, 'packages', 'hive-mind-core', 'src', 'index.ts'),
    },
    sourcemap: true,
    minify: true,
    // metafile lets stage-sidecar-deps.mjs enumerate exactly which of the
    // EXTERNAL packages the bundle actually `require()`s at runtime, so it
    // stages precisely that set (and its transitive prod deps) into
    // resources/node_modules/ — no more, no less. Written next to the bundle.
    metafile: true,
    banner: {
      js: '// Waggle Sidecar — bundled server for Tauri desktop\n'
        + '// Generated by scripts/build-sidecar.mjs\n'
        + 'import { createRequire } from "node:module";\n'
        + 'const require = createRequire(import.meta.url);\n',
    },
    logLevel: 'warning',
  });

  if (result.errors.length > 0) {
    console.error('[build-sidecar] Build errors:', result.errors);
    process.exit(1);
  }

  if (result.warnings.length > 0) {
    console.warn(`[build-sidecar] ${result.warnings.length} warnings (non-blocking)`);
  }

  fs.writeFileSync(metaFile, JSON.stringify(result.metafile));
  console.log('[build-sidecar] Wrote esbuild metafile', metaFile);

  const stat = fs.statSync(outFile);
  const sizeMB = (stat.size / 1024 / 1024).toFixed(1);
  console.log(`[build-sidecar] Done. Output: ${sizeMB} MB`);

  // Copy marketplace seed database if it exists
  const marketplaceDb = path.join(root, 'packages', 'marketplace', 'seed', 'marketplace.db');
  if (fs.existsSync(marketplaceDb)) {
    fs.copyFileSync(marketplaceDb, path.join(resourcesDir, 'marketplace.db'));
    console.log('[build-sidecar] Copied marketplace.db seed');
  }
} catch (err) {
  console.error('[build-sidecar] Build failed:', err.message);
  process.exit(1);
}