/**
 * Any copyright is dedicated to the Public Domain.
 * http://creativecommons.org/publicdomain/zero/1.0/
 */

/* exported testGenerator, disableWorkerTest */
var disableWorkerTest = "Need a way to set temporary prefs from a worker";

var testGenerator = testSteps();

function* testSteps() {
  const name = this.window
    ? window.location.pathname
    : "test_maximal_structured_clone_size.js";
  const megaBytes = 1024 * 1024;
  const kMaxIdbMessageSize = 20; // in MB

  let chunks = new Array(kMaxIdbMessageSize);
  for (let i = 0; i < kMaxIdbMessageSize; i++) {
    chunks[i] = new ArrayBuffer(1 * megaBytes);
  }

  if (this.window) {
    SpecialPowers.pushPrefEnv(
      {
        set: [
          [
            "dom.indexedDB.maxStructuredCloneSize",
            kMaxIdbMessageSize * megaBytes,
          ],
        ],
      },
      continueToNextStep
    );
    yield undefined;
  } else {
    setMaxStructuredCloneSize(kMaxIdbMessageSize * megaBytes);
  }

  let openRequest = indexedDB.open(name, 1);
  openRequest.onerror = errorHandler;
  openRequest.onupgradeneeded = grabEventAndContinueHandler;
  openRequest.onsuccess = unexpectedSuccessHandler;
  let event = yield undefined;

  let db = event.target.result;

  is(db.objectStoreNames.length, 0, "Correct objectStoreNames list");

  let objectStore = db.createObjectStore("test store", { keyPath: "id" });
  is(db.objectStoreNames.length, 1, "Correct objectStoreNames list");
  is(
    db.objectStoreNames.item(0),
    objectStore.name,
    "Correct object store name"
  );

  function testTooLargeError(aOperation, aObject) {
    try {
      objectStore[aOperation](aObject).onerror = errorHandler;
      ok(false, "UnknownError is expected to be thrown!");
    } catch (e) {
      ok(e instanceof DOMException, "got a DOM exception");
      is(e.name, "UnknownError", "correct error");
      ok(!!e.message, "Error message: " + e.message);
      ok(
        e.message.startsWith(
          `IDBObjectStore.${aOperation}: The structured clone is too large`
        ),
        "Correct error message prefix."
      );
    }
  }

  info("Verify IDBObjectStore.add() - object is too large");
  testTooLargeError("add", { id: 1, data: chunks });

  info(
    "Verify IDBObjectStore.add() - object size is closed to the maximal size."
  );
  chunks.length = chunks.length - 1;
  let request = objectStore.add({ id: 1, data: chunks });
  request.onerror = errorHandler;
  request.onsuccess = grabEventAndContinueHandler;
  yield undefined;

  openRequest.onsuccess = continueToNextStep;
  yield undefined;

  db.close();

  finishTest();
}