// Derive dist-firefox/ from dist/ by swapping in a Firefox-flavored manifest.
//
// Firefox MV3 differs from Chrome: no service-worker background, no sidePanel
// API/permission, native sidebar instead of side_panel, and a required gecko id
// + data-collection declaration. Everything else (JS/CSS/HTML) is identical.
//
// Runs as part of `npm run build`; also imported by scripts/package.mjs.
//   node scripts/firefox-dist.mjs   (standalone, after `vite build`)

import { cpSync, readFileSync, rmSync, statSync, writeFileSync } from "node:fs";
import { fileURLToPath } from "node:url";
import { dirname, resolve } from "node:path";

const root = resolve(dirname(fileURLToPath(import.meta.url)), "..");
const dist = resolve(root, "dist");
const distFirefox = resolve(root, "dist-firefox");

/** Build dist-firefox/ from dist/. Returns the output dir path. */
export function buildFirefoxDist() {
  try {
    statSync(resolve(dist, "manifest.json"));
  } catch {
    throw new Error("dist/ not built yet — run `vite build` first.");
  }

  const base = JSON.parse(readFileSync(resolve(dist, "manifest.json"), "utf8"));
  const firefox = { ...base };
  firefox.background = { scripts: ["background.js"], type: "module" };
  delete firefox.side_panel;
  // sidePanel is a Chrome-only permission; Firefox warns on the unknown key.
  firefox.permissions = (base.permissions ?? []).filter(
    (p) => p !== "sidePanel",
  );
  firefox.icons = { 128: "icon.svg" };
  firefox.sidebar_action = {
    default_panel: "viewer.html?panel=1",
    default_title: "History Graph",
    default_icon: "icon.svg",
  };
  firefox.browser_specific_settings = {
    gecko: {
      id: "history-graph@chuckdries",
      // 140 is the floor for data_collection_permissions (below it the key is
      // ignored); storage.session only needs 115.
      strict_min_version: "140.0",
      // Everything stays in local IndexedDB / storage.session — nothing is ever
      // transmitted, so we declare no data collection. (Required by AMO.)
      data_collection_permissions: { required: ["none"] },
    },
  };

  rmSync(distFirefox, { recursive: true, force: true });
  cpSync(dist, distFirefox, { recursive: true });
  writeFileSync(
    resolve(distFirefox, "manifest.json"),
    JSON.stringify(firefox, null, 2) + "\n",
  );
  return distFirefox;
}

// Allow running directly: `node scripts/firefox-dist.mjs`.
if (import.meta.url === `file://${process.argv[1]}`) {
  const out = buildFirefoxDist();
  console.log(`Wrote ${out}/manifest.json`);
}