import { importModuleWithRetry } from "../src/platform/moduleLoading";

function assert(condition: unknown, message: string): asserts condition {
  if (!condition) throw new Error(message);
}

async function verifyModuleImportRetry() {
  let attempts = 0;
  let pauses = 0;
  const module = { id: "files", uiCapabilities: { "files.fileExplorer": {} } };
  const imported = await importModuleWithRetry(async () => {
    attempts += 1;
    if (attempts === 1) throw new TypeError("Synthetic transient import failure");
    return module;
  }, async () => { pauses += 1; });
  assert(imported === module, "a second successful import preserves the real module descriptor");
  assert(attempts === 2 && pauses === 1, "a transient failure gets exactly one bounded retry");

  attempts = 0;
  pauses = 0;
  const terminal = new TypeError("Synthetic final import failure");
  let observed: unknown;
  try {
    await importModuleWithRetry(async () => { attempts += 1; throw terminal; }, async () => { pauses += 1; });
  } catch (error) { observed = error; }
  assert(observed === terminal, "a final failure must be reported, never replaced by an empty or fake module");
  assert(attempts === 2 && pauses === 1, "permanent failure cannot start an unbounded retry loop");

  attempts = 0;
  pauses = 0;
  await importModuleWithRetry(async () => { attempts += 1; return module; }, async () => { pauses += 1; });
  assert(attempts === 1 && pauses === 0, "healthy imports do not pause or repeat");
  console.log("Module import retry tests passed.");
}

void verifyModuleImportRetry().catch((error) => { throw error; });