const assert = require("node:assert/strict");
const { test } = require("node:test");
const fs = require("node:fs/promises");
const os = require("node:os");
const path = require("node:path");
const vm = require("node:vm");
const { writeOutput } = require("../scripts/write-output.cjs");

test("build output keeps the previous script available until complete replacement", async t => {
  const folder = await fs.mkdtemp(path.join(os.tmpdir(), "opportunities-build-"));
  t.after(() => fs.rm(folder, { recursive: true, force: true }));
  const file = path.join(folder, "background.js");
  await writeOutput(file, "old script");
  await writeOutput(file, "new script", { ...fs, async rename(from, to) {
    assert.equal(await fs.readFile(to, "utf8"), "old script");
    assert.equal(await fs.readFile(from, "utf8"), "new script");
    return fs.rename(from, to);
  } });
  assert.equal(await fs.readFile(file, "utf8"), "new script");
  await writeOutput(file, "new script", { ...fs, writeFile() { assert.fail("Unchanged scripts must not be rewritten"); } });
  for (const operation of ["writeFile", "rename"]) {
    await assert.rejects(writeOutput(file, "failed update", { ...fs, async [operation]() {
      throw new Error("Synthetic publication failure");
    } }), /Synthetic publication failure/);
    assert.equal(await fs.readFile(file, "utf8"), "new script");
    assert.deepEqual(await fs.readdir(folder), ["background.js"]);
  }
});

test("packaged background scripts start and register listeners without DOM or network", async () => {
  for (const target of ["chromium", "firefox"]) {
    const folder = path.join(__dirname, "../dist", target);
    const manifest = JSON.parse(await fs.readFile(path.join(folder, "manifest.json"), "utf8"));
    const files = manifest.background.scripts || [manifest.background.service_worker];
    const listeners = [];
    const api = { runtime: { onMessage: { addListener: handler => listeners.push(handler) } } };
    const context = vm.createContext({ [target === "firefox" ? "browser" : "chrome"]: api,
      setTimeout, fetch() { assert.fail("No startup network requests"); } });
    for (const file of files) {
      new vm.Script(await fs.readFile(path.join(folder, file), "utf8"), { filename: file }).runInContext(context);
    }
    assert.equal(listeners.length, 1, target);
    for (const entry of manifest.content_scripts) {
      for (const file of entry.js) new vm.Script(await fs.readFile(path.join(folder, file), "utf8"));
    }
  }
});