// META: title=IDBVersionChangeEvent
// META: global=window,worker
// META: script=resources/support.js

// Spec: https://w3c.github.io/IndexedDB/#events

'use strict';

async_test(t => {
  let db;
  const dbname = location + '-' + t.name;

  indexedDB.deleteDatabase(dbname);

  const openrq = indexedDB.open(dbname, 3);

  openrq.onupgradeneeded = t.step_func((e) => {
    assert_equals(e.oldVersion, 0, 'old version (upgradeneeded)');
    assert_equals(e.newVersion, 3, 'new version (upgradeneeded)');
    assert_true(
        e instanceof IDBVersionChangeEvent,
        'upgradeneeded instanceof IDBVersionChangeEvent');
  });

  openrq.onsuccess = t.step_func((e) => {
    db = e.target.result;

    db.onversionchange = t.step_func((e) => {
      assert_equals(e.oldVersion, 3, 'old version (versionchange)');
      assert_equals(e.newVersion, null, 'new version (versionchange)');
      assert_true(
          e instanceof IDBVersionChangeEvent,
          'versionchange instanceof IDBVersionChangeEvent');
      db.close();
    });

    // Errors
    db.onerror = fail(t, 'db.error');
    db.onabort = fail(t, 'db.abort');

    setTimeout(t.step_func(deleteDB), 10);
  });

  // Errors
  openrq.onerror = fail(t, 'open.error');
  openrq.onblocked = fail(t, 'open.blocked');

  function deleteDB(e) {
    const deleterq = indexedDB.deleteDatabase(dbname);

    deleterq.onsuccess = t.step_func((e) => {
      assert_equals(
          e.result, undefined, 'result (delete.success for nonexistent db)');
      assert_equals(e.oldVersion, 3, 'old version (delete.success)');
      assert_equals(e.newVersion, null, 'new version (delete.success)');
      assert_true(
          e instanceof IDBVersionChangeEvent,
          'delete.success instanceof IDBVersionChangeEvent');

      setTimeout(deleteNonExistentDB, 10);
    });

    // Errors
    deleterq.onerror = fail(t, 'delete.error');
    deleterq.onblocked = fail(t, 'delete.blocked');
  }

  function deleteNonExistentDB(e) {
    const deleterq = indexedDB.deleteDatabase('db-does-not-exist');

    deleterq.onsuccess = t.step_func((e) => {
      assert_equals(
          e.result, undefined, 'result (delete.success for nonexistent db)');
      assert_equals(
          e.oldVersion, 0, 'old version (delete.success for nonexistent db)');
      assert_equals(
          e.newVersion, null,
          'new version (delete.success for nonexistent db)');
      assert_true(
          e instanceof IDBVersionChangeEvent,
          'delete.success instanceof IDBVersionChangeEvent');

      setTimeout(function() {
        t.done();
      }, 10);
    });

    // Errors
    deleterq.onerror = fail(t, 'delete.error');
    deleterq.onblocked = fail(t, 'delete.blocked');
  }
}, 'IDBVersionChangeEvent fired in upgradeneeded, versionchange and deleteDatabase');