// Bundle the omni_pca side panel into a single ESM file the HA static
// path serves at /api/omni_pca/panel.js.
//
// Usage:
//   node build.mjs           # one-shot production build
//   node build.mjs --watch   # rebuild on source change
//
// Output is intentionally placed at ../www/panel.js so the Python side
// (websocket.py:async_register_side_panel) finds it without extra
// configuration. The frontend dir + the Python integration sit in the
// same custom_components/omni_pca/ tree so end-users just install the
// integration; no separate HACS package needed.

import { build, context } from "esbuild";
import { fileURLToPath } from "node:url";
import { dirname, resolve } from "node:path";

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

const opts = {
  entryPoints: [resolve(__dirname, "src/omni-panel-programs.ts")],
  bundle: true,
  format: "esm",
  target: "es2022",
  minify: !watch,
  sourcemap: watch ? "inline" : false,
  outfile: resolve(__dirname, "../www/panel.js"),
  // Lit ships its own ESM build; bundle it inline so the panel is a
  // single self-contained file (matches how HACS-distributed cards work).
  loader: { ".ts": "ts" },
  banner: {
    js: "// omni_pca side panel — generated by frontend/build.mjs. Edit src/, not this file.",
  },
};

if (watch) {
  const ctx = await context(opts);
  await ctx.watch();
  console.log("watching for changes…");
} else {
  await build(opts);
  console.log("built ->", opts.outfile);
}