'use strict';

function loadScript(path) {
  let script = document.createElement('script');
  let promise = new Promise(resolve => script.onload = resolve);
  script.src = path;
  script.async = false;
  document.head.appendChild(script);
  return promise;
}

function loadScripts(paths) {
  let chain = Promise.resolve();
  for (let path of paths) {
    chain = chain.then(() => loadScript(path));
  }
  return chain;
}

function performChromiumSetup() {
  // Make sure we are actually on Chromium.
  if (!Mojo) {
    return;
  }

  // Load the Chromium-specific resources.
  let prefix = '/resources/chromium';
  let extra = [];
  if (window.location.pathname.includes('/LayoutTests/')) {
    let root = window.location.pathname.match(/.*LayoutTests/);
    prefix = `${root}/external/wpt/resources/chromium`;
    extra = [
      `${root}/resources/bluetooth/bluetooth-fake-adapter.js`,
    ];
  } else if (window.location.pathname.startsWith('/bluetooth/https/')) {
    extra = [
      '/js-test-resources/bluetooth/bluetooth-fake-adapter.js',
    ];
  }
  return loadScripts([
    `${prefix}/mojo_bindings.js`,
    `${prefix}/mojo_layouttest_test.mojom.js`,
    `${prefix}/uuid.mojom.js`,
    `${prefix}/fake_bluetooth.mojom.js`,
    `${prefix}/fake_bluetooth_chooser.mojom.js`,
    `${prefix}/web-bluetooth-test.js`,
  ].concat(extra))
      // Call setBluetoothFakeAdapter() to clean up any fake adapters left over
      // by legacy tests.
      // Legacy tests that use setBluetoothFakeAdapter() sometimes fail to clean
      // their fake adapter. This is not a problem for these tests because the
      // next setBluetoothFakeAdapter() will clean it up anyway but it is a
      // problem for the new tests that do not use setBluetoothFakeAdapter().
      // TODO(crbug.com/569709): Remove once setBluetoothFakeAdapter is no
      // longer used.
      .then(() => typeof setBluetoothFakeAdapter === 'undefined' ?
          undefined : setBluetoothFakeAdapter(''));
}


// These tests rely on the User Agent providing an implementation of the
// Web Bluetooth Testing API.
// https://docs.google.com/document/d/1Nhv_oVDCodd1pEH_jj9k8gF4rPGb_84VYaZ9IG8M_WY/edit?ts=59b6d823#heading=h.7nki9mck5t64
function bluetooth_test(func, name, properties) {
  Promise.resolve()
    .then(() => promise_test(t => Promise.resolve()
      // Trigger Chromium-specific setup.
      .then(performChromiumSetup)
      .then(() => func(t))
      .then(() => navigator.bluetooth.test.allResponsesConsumed())
      .then(consumed => assert_true(consumed)), name, properties));
}

// HCI Error Codes. Used for simulateGATT[Dis]ConnectionResponse.
// For a complete list of possible error codes see
// BT 4.2 Vol 2 Part D 1.3 List Of Error Codes.
const HCI_SUCCESS = 0x0000;
const HCI_CONNECTION_TIMEOUT = 0x0008;

// GATT Error codes. Used for GATT operations responses.
// BT 4.2 Vol 3 Part F 3.4.1.1 Error Response
const GATT_SUCCESS        = 0x0000;
const GATT_INVALID_HANDLE = 0x0001;

// Bluetooth UUID constants:
// Services:
var blocklist_test_service_uuid = "611c954a-263b-4f4a-aab6-01ddb953f985";
var request_disconnection_service_uuid = "01d7d889-7451-419f-aeb8-d65e7b9277af";
// Characteristics:
var blocklist_exclude_reads_characteristic_uuid =
  "bad1c9a2-9a5b-4015-8b60-1579bbbf2135";
var request_disconnection_characteristic_uuid =
  "01d7d88a-7451-419f-aeb8-d65e7b9277af";
// Descriptors:
var blocklist_test_descriptor_uuid = "bad2ddcf-60db-45cd-bef9-fd72b153cf7c";
var blocklist_exclude_reads_descriptor_uuid =
    "bad3ec61-3cc3-4954-9702-7977df514114";

// Sometimes we need to test that using either the name, alias, or UUID
// produces the same result. The following objects help us do that.
var generic_access = {
  alias: 0x1800,
  name: 'generic_access',
  uuid: '00001800-0000-1000-8000-00805f9b34fb'
};
var device_name = {
  alias: 0x2a00,
  name: 'gap.device_name',
  uuid: '00002a00-0000-1000-8000-00805f9b34fb'
};
var reconnection_address = {
  alias: 0x2a03,
  name: 'gap.reconnection_address',
  uuid: '00002a03-0000-1000-8000-00805f9b34fb'
};
var heart_rate = {
  alias: 0x180d,
  name: 'heart_rate',
  uuid: '0000180d-0000-1000-8000-00805f9b34fb'
};
var health_thermometer = {
  alias: 0x1809,
  name: 'health_thermometer',
  uuid: '00001809-0000-1000-8000-00805f9b34fb'
};
var body_sensor_location = {
  alias: 0x2a38,
  name: 'body_sensor_location',
  uuid: '00002a38-0000-1000-8000-00805f9b34fb'
};
var glucose = {
  alias: 0x1808,
  name: 'glucose',
  uuid: '00001808-0000-1000-8000-00805f9b34fb'
};
var battery_service = {
  alias: 0x180f,
  name: 'battery_service',
  uuid: '0000180f-0000-1000-8000-00805f9b34fb'
};
var battery_level = {
  alias: 0x2A19,
  name: 'battery_level',
  uuid: '00002a19-0000-1000-8000-00805f9b34fb'
};
var user_description = {
  alias: 0x2901,
  name: 'gatt.characteristic_user_description',
  uuid: '00002901-0000-1000-8000-00805f9b34fb'
};
var client_characteristic_configuration = {
  alias: 0x2902,
  name: 'gatt.client_characteristic_configuration',
  uuid: '00002902-0000-1000-8000-00805f9b34fb'
};
var measurement_interval = {
  alias: 0x2a21,
  name: 'measurement_interval',
  uuid: '00002a21-0000-1000-8000-00805f9b34fb'
};

// The following tests make sure the Web Bluetooth implementation
// responds correctly to the different types of errors the
// underlying platform might return for GATT operations.

// Each browser should map these characteristics to specific code paths
// that result in different errors thus increasing code coverage
// when testing. Therefore some of these characteristics might not be useful
// for all browsers.
//
// TODO(ortuno): According to the testing spec errorUUID(0x101) to
// errorUUID(0x1ff) should be use for the uuids of the characteristics.
var gatt_errors_tests = [{
  testName: 'GATT Error: Unknown.',
  uuid: errorUUID(0xA1),
  error: new DOMException(
      'GATT Error Unknown.',
      'NotSupportedError')
}, {
  testName: 'GATT Error: Failed.',
  uuid: errorUUID(0xA2),
  error: new DOMException(
      'GATT operation failed for unknown reason.',
      'NotSupportedError')
}, {
  testName: 'GATT Error: In Progress.',
  uuid: errorUUID(0xA3),
  error: new DOMException(
      'GATT operation already in progress.',
      'NetworkError')
}, {
  testName: 'GATT Error: Invalid Length.',
  uuid: errorUUID(0xA4),
  error: new DOMException(
      'GATT Error: invalid attribute length.',
      'InvalidModificationError')
}, {
  testName: 'GATT Error: Not Permitted.',
  uuid: errorUUID(0xA5),
  error: new DOMException(
      'GATT operation not permitted.',
      'NotSupportedError')
}, {
  testName: 'GATT Error: Not Authorized.',
  uuid: errorUUID(0xA6),
  error: new DOMException(
      'GATT operation not authorized.',
      'SecurityError')
}, {
  testName: 'GATT Error: Not Paired.',
  uuid: errorUUID(0xA7),
  // TODO(ortuno): Change to InsufficientAuthenticationError or similiar
  // once https://github.com/WebBluetoothCG/web-bluetooth/issues/137 is
  // resolved.
  error: new DOMException(
      'GATT Error: Not paired.',
      'NetworkError')
}, {
  testName: 'GATT Error: Not Supported.',
  uuid: errorUUID(0xA8),
  error: new DOMException(
      'GATT Error: Not supported.',
      'NotSupportedError')
}];

// Waits until the document has finished loading.
function waitForDocumentReady() {
  return new Promise(resolve => {
    if (document.readyState === 'complete') {
      resolve();
    }

    window.addEventListener('load', () => {
      resolve();
    }, {once: true});
  });
}

function callWithTrustedClick(callback) {
  return waitForDocumentReady()
    .then(() => new Promise(resolve => {
      let button = document.createElement('button');
      button.textContent = 'click to continue test';
      button.style.display = 'block';
      button.style.fontSize = '20px';
      button.style.padding = '10px';
      button.onclick = () => {
        document.body.removeChild(button);
        resolve(callback());
      };
      document.body.appendChild(button);
      test_driver.click(button);
    }));
}

// Calls requestDevice() in a context that's 'allowed to show a popup'.
function requestDeviceWithTrustedClick() {
  let args = arguments;
  return callWithTrustedClick(
      () => navigator.bluetooth.requestDevice.apply(navigator.bluetooth, args));
}

// errorUUID(alias) returns a UUID with the top 32 bits of
// '00000000-97e5-4cd7-b9f1-f5a427670c59' replaced with the bits of |alias|.
// For example, errorUUID(0xDEADBEEF) returns
// 'deadbeef-97e5-4cd7-b9f1-f5a427670c59'. The bottom 96 bits of error UUIDs
// were generated as a type 4 (random) UUID.
function errorUUID(uuidAlias) {
  // Make the number positive.
  uuidAlias >>>= 0;
  // Append the alias as a hex number.
  var strAlias = '0000000' + uuidAlias.toString(16);
  // Get last 8 digits of strAlias.
  strAlias = strAlias.substr(-8);
  // Append Base Error UUID
  return strAlias + '-97e5-4cd7-b9f1-f5a427670c59';
}

// Function to test that a promise rejects with the expected error type and
// message.
function assert_promise_rejects_with_message(promise, expected, description) {
  return promise.then(() => {
    assert_unreached('Promise should have rejected: ' + description);
  }, error => {
    assert_equals(error.name, expected.name, 'Unexpected Error Name:');
    if (expected.message) {
      assert_equals(error.message, expected.message, 'Unexpected Error Message:');
    }
  });
}

function runGarbageCollection()
{
  // Run gc() as a promise.
  return new Promise(
      function(resolve, reject) {
        GCController.collect();
        step_timeout(resolve, 0);
      });
}

function eventPromise(target, type, options) {
  return new Promise(resolve => {
    let wrapper = function(event) {
      target.removeEventListener(type, wrapper);
      resolve(event);
    };
    target.addEventListener(type, wrapper, options);
  });
}

// Helper function to assert that events are fired and a promise resolved
// in the correct order.
// 'event' should be passed as |should_be_first| to indicate that the events
// should be fired first, otherwise 'promiseresolved' should be passed.
// Attaches |num_listeners| |event| listeners to |object|. If all events have
// been fired and the promise resolved in the correct order, returns a promise
// that fulfills with the result of |object|.|func()| and |event.target.value|
// of each of event listeners. Otherwise throws an error.
function assert_promise_event_order_(should_be_first, object, func, event, num_listeners) {
  let order = [];
  let event_promises = [];
  for (let i = 0; i < num_listeners; i++) {
    event_promises.push(new Promise(resolve => {
      let event_listener = (e) => {
        object.removeEventListener(event, event_listener);
        order.push('event');
        resolve(e.target.value);
      };
      object.addEventListener(event, event_listener);
    }));
  }

  let func_promise = object[func]().then(result => {
    order.push('promiseresolved');
    return result;
  });

  return Promise.all([func_promise, ...event_promises])
    .then((result) => {
      if (should_be_first !== order[0]) {
        throw should_be_first === 'promiseresolved' ?
                      `'${event}' was fired before promise resolved.` :
                      `Promise resolved before '${event}' was fired.`;
      }

      if (order[0] !== 'promiseresolved' &&
          order[order.length - 1] !== 'promiseresolved') {
        throw 'Promise resolved in between event listeners.';
      }

      return result;
    });
}

// See assert_promise_event_order_ above.
function assert_promise_resolves_before_event(
  object, func, event, num_listeners=1) {
  return assert_promise_event_order_(
    'promiseresolved', object, func, event, num_listeners);
}

// See assert_promise_event_order_ above.
function assert_promise_resolves_after_event(
  object, func, event, num_listeners=1) {
  return assert_promise_event_order_(
    'event', object, func, event, num_listeners);
}

// Returns a promise that resolves after 100ms unless
// the the event is fired on the object in which case
// the promise rejects.
function assert_no_events(object, event_name) {
  return new Promise((resolve, reject) => {
    let event_listener = (e) => {
      object.removeEventListener(event_name, event_listener);
      assert_unreached('Object should not fire an event.');
    };
    object.addEventListener(event_name, event_listener);
    // TODO: Remove timeout.
    // http://crbug.com/543884
    step_timeout(() => {
      object.removeEventListener(event_name, event_listener);
      resolve();
    }, 100);
  });
}

class TestCharacteristicProperties {
  // |properties| is an array of strings for property bits to be set
  // as true.
  constructor(properties) {
    this.broadcast                 = false;
    this.read                      = false;
    this.writeWithoutResponse      = false;
    this.write                     = false;
    this.notify                    = false;
    this.indicate                  = false;
    this.authenticatedSignedWrites = false;
    this.reliableWrite             = false;
    this.writableAuxiliaries       = false;

    properties.forEach(val => {
      if (this.hasOwnProperty(val))
        this[val] = true;
      else
        throw `Invalid member '${val}'`;
    });
  }
}

function assert_properties_equal(properties, expected_properties) {
  for (let key in expected_properties) {
    assert_equals(properties[key], expected_properties[key]);
  }
}

class EventCatcher {
  constructor(object, event) {
    this.eventFired = false;
    let event_listener = () => {
      object.removeEventListener(event, event_listener);
      this.eventFired = true;
    };
    object.addEventListener(event, event_listener);
  }
}

// Returns a function that when called returns a promise that resolves when
// the device has disconnected. Example:
// device.gatt.connect()
//   .then(gatt => get_request_disconnection(gatt))
//   .then(requestDisconnection => requestDisconnection())
//   .then(() => // device is now disconnected)
function get_request_disconnection(gattServer) {
  return gattServer.getPrimaryService(request_disconnection_service_uuid)
    .then(service => service.getCharacteristic(request_disconnection_characteristic_uuid))
    .then(characteristic => {
      return () => assert_promise_rejects_with_message(
        characteristic.writeValue(new Uint8Array([0])),
        new DOMException(
          'GATT Server is disconnected. Cannot perform GATT operations. ' +
          '(Re)connect first with `device.gatt.connect`.',
          'NetworkError'));
    });
}

function generateRequestDeviceArgsWithServices(services = ['heart_rate']) {
  return [{
    filters: [{ services: services }]
  }, {
    filters: [{ services: services, name: 'Name' }]
  }, {
    filters: [{ services: services, namePrefix: 'Pre' }]
  }, {
    filters: [{ services: services, name: 'Name', namePrefix: 'Pre' }]
  }, {
    filters: [{ services: services }],
    optionalServices: ['heart_rate']
  }, {
    filters: [{ services: services, name: 'Name' }],
    optionalServices: ['heart_rate']
  }, {
    filters: [{ services: services, namePrefix: 'Pre' }],
    optionalServices: ['heart_rate']
  }, {
    filters: [{ services: services, name: 'Name', namePrefix: 'Pre' }],
    optionalServices: ['heart_rate']
  }];
}

// Causes |fake_peripheral| to disconnect and returns a promise that resolves
// once `gattserverdisconnected` has been fired on |device|.
function simulateGATTDisconnectionAndWait(device, fake_peripheral) {
  return Promise.all([
    eventPromise(device, 'gattserverdisconnected'),
    fake_peripheral.simulateGATTDisconnection(),
  ]);
}

// Simulates a pre-connected device with |address|, |name| and
// |knownServiceUUIDs|.
function setUpPreconnectedDevice({
  address = '00:00:00:00:00:00', name = 'LE Device', knownServiceUUIDs = []}) {
  return navigator.bluetooth.test.simulateCentral({state: 'powered-on'})
    .then(fake_central => fake_central.simulatePreconnectedPeripheral({
      address: address,
      name: name,
      knownServiceUUIDs: knownServiceUUIDs,
    }));
}

// Returns a FakePeripheral that corresponds to a simulated pre-connected device
// called 'Health Thermometer'. The device has two known serviceUUIDs:
// 'generic_access' and 'health_thermometer'.
function setUpHealthThermometerDevice() {
  return setUpPreconnectedDevice({
    address: '09:09:09:09:09:09',
    name: 'Health Thermometer',
    knownServiceUUIDs: ['generic_access', 'health_thermometer'],
  });
}

// Returns an array containing two FakePeripherals corresponding
// to the simulated devices.
function setUpHealthThermometerAndHeartRateDevices() {
  return navigator.bluetooth.test.simulateCentral({state: 'powered-on'})
   .then(fake_central => Promise.all([
     fake_central.simulatePreconnectedPeripheral({
       address: '09:09:09:09:09:09',
       name: 'Health Thermometer',
       knownServiceUUIDs: ['generic_access', 'health_thermometer'],
     }),
     fake_central.simulatePreconnectedPeripheral({
       address: '08:08:08:08:08:08',
       name: 'Heart Rate',
       knownServiceUUIDs: ['generic_access', 'heart_rate'],
     })]));
}

// Returns the same fake peripheral as setUpHealthThermometerDevice() except
// that connecting to the peripheral will succeed.
function setUpConnectableHealthThermometerDevice() {
  let fake_peripheral;
  return setUpHealthThermometerDevice()
    .then(_ => fake_peripheral = _)
    .then(() => fake_peripheral.setNextGATTConnectionResponse({
      code: HCI_SUCCESS,
    }))
    .then(() => fake_peripheral);
}

// Returns an object containing a BluetoothDevice discovered using |options|,
// its corresponding FakePeripheral and FakeRemoteGATTServices.
// The simulated device is called 'Health Thermometer' it has two known service
// UUIDs: 'generic_access' and 'health_thermometer' which correspond to two
// services with the same UUIDs. The 'health thermometer' service contains three
// characteristics:
//  - 'temperature_measurement' (indicate),
//  - 'temperature_type' (read),
//  - 'measurement_interval' (read, write, indicate)
// The 'measurement_interval' characteristic contains a
// 'gatt.client_characteristic_configuration' descriptor and a
// 'characteristic_user_description' descriptor.
// The device has been connected to and its attributes are ready to be
// discovered.
function getHealthThermometerDevice(options) {
  let result;
  return getConnectedHealthThermometerDevice(options)
    .then(_ => result = _)
    .then(() => result.fake_peripheral.setNextGATTDiscoveryResponse({
      code: HCI_SUCCESS,
    }))
    .then(() => result);
}

// Similar to getHealthThermometerDevice except that the peripheral has
// two 'health_thermometer' services.
function getTwoHealthThermometerServicesDevice(options) {
  let device;
  let fake_peripheral;
  let fake_generic_access;
  let fake_health_thermometer1;
  let fake_health_thermometer2;

  return getConnectedHealthThermometerDevice(options)
    .then(result => {
      ({
        device,
        fake_peripheral,
        fake_generic_access,
        fake_health_thermometer: fake_health_thermometer1,
      } = result);
    })
    .then(() => fake_peripheral.addFakeService({uuid: 'health_thermometer'}))
    .then(s => fake_health_thermometer2 = s)
    .then(() => fake_peripheral.setNextGATTDiscoveryResponse({
      code: HCI_SUCCESS}))
    .then(() => ({
      device: device,
      fake_peripheral: fake_peripheral,
      fake_generic_access: fake_generic_access,
      fake_health_thermometer1: fake_health_thermometer1,
      fake_health_thermometer2: fake_health_thermometer2
    }));
}

// Returns an object containing a Health Thermometer BluetoothRemoteGattService
// and its corresponding FakeRemoteGATTService.
function getHealthThermometerService() {
  let result;
  return getHealthThermometerDevice()
    .then(r => result = r)
    .then(() => result.device.gatt.getPrimaryService('health_thermometer'))
    .then(service => Object.assign(result, {
      service,
      fake_service: result.fake_health_thermometer,
    }));
}

// Returns an object containing a Measurement Interval
// BluetoothRemoteGATTCharacteristic and its corresponding
// FakeRemoteGATTCharacteristic.
function getMeasurementIntervalCharacteristic() {
  let result;
  return getHealthThermometerService()
    .then(r => result = r)
    .then(() => result.service.getCharacteristic('measurement_interval'))
    .then(characteristic => Object.assign(result, {
      characteristic,
      fake_characteristic: result.fake_measurement_interval,
    }));
}

function getUserDescriptionDescriptor() {
  let result;
  return getMeasurementIntervalCharacteristic()
    .then(r => result = r)
    .then(() => result.characteristic.getDescriptor(
        'gatt.characteristic_user_description'))
    .then(descriptor => Object.assign(result, {
      descriptor,
      fake_descriptor: result.fake_user_description,
    }));
}

// Populates a fake_peripheral with various fakes appropriate for a health
// thermometer.  This resolves to an associative array composed of the fakes,
// including the |fake_peripheral|.
function populateHealthThermometerFakes(fake_peripheral) {
  let fake_generic_access, fake_health_thermometer, fake_measurement_interval,
      fake_user_description, fake_cccd, fake_temperature_measurement,
      fake_temperature_type;
  return fake_peripheral.addFakeService({uuid: 'generic_access'})
    .then(_ => fake_generic_access = _)
    .then(() => fake_peripheral.addFakeService({
        uuid: 'health_thermometer',
    }))
    .then(_ => fake_health_thermometer = _)
    .then(() => fake_health_thermometer.addFakeCharacteristic({
      uuid: 'measurement_interval',
      properties: ['read', 'write', 'indicate'],
    }))
    .then(_ => fake_measurement_interval = _)
    .then(() => fake_measurement_interval.addFakeDescriptor({
      uuid: 'gatt.characteristic_user_description',
    }))
    .then(_ => fake_user_description = _)
    .then(() => fake_measurement_interval.addFakeDescriptor({
      uuid: 'gatt.client_characteristic_configuration',
    }))
    .then(_ => fake_cccd = _)
    .then(() => fake_health_thermometer.addFakeCharacteristic({
      uuid: 'temperature_measurement',
      properties: ['indicate'],
    }))
    .then(_ => fake_temperature_measurement = _)
    .then(() => fake_health_thermometer.addFakeCharacteristic({
      uuid: 'temperature_type',
      properties: ['read'],
    }))
    .then(_ => fake_temperature_type = _)
    .then(() => ({
      fake_peripheral,
      fake_generic_access,
      fake_health_thermometer,
      fake_measurement_interval,
      fake_cccd,
      fake_user_description,
      fake_temperature_measurement,
      fake_temperature_type,
    }));
}

// Similar to getHealthThermometerDevice except the GATT discovery
// response has not been set yet so more attributes can still be added.
function getConnectedHealthThermometerDevice(options) {
  let device, fake_peripheral, fakes;
  return getDiscoveredHealthThermometerDevice(options)
    .then(_ => ({device, fake_peripheral} = _))
    .then(() => fake_peripheral.setNextGATTConnectionResponse({
      code: HCI_SUCCESS,
    }))
    .then(() => populateHealthThermometerFakes(fake_peripheral))
    .then(_ => fakes = _)
    .then(() => device.gatt.connect())
    .then(() => Object.assign({device}, fakes));
}

// Returns an object containing a BluetoothDevice discovered using |options|,
// its corresponding FakePeripheral and FakeRemoteGATTServices.
// The simulated device is called 'Blocklist Device' and it has one known
// service UUIDs |blocklist_test_service_uuid| which
// correspond to a service with the same UUID. The
// |blocklist_test_service_uuid| service contains two characteristics:
//   - |blocklist_exclude_reads_characteristic_uuid| (read, write)
//   - 'gap.peripheral_privacy_flag' (read, write)
// The 'gap.peripheral_privacy_flag' characteristic contains three descriptors:
//   - |blocklist_test_descriptor_uuid|
//   - |blocklist_exclude_reads_descriptor_uuid|
//   - 'gatt.client_characteristic_configuration'
// These are special UUIDs that have been added to the blocklist found at
// https://github.com/WebBluetoothCG/registries/blob/master/gatt_blocklist.txt
// There are also test UUIDs that have been added to the test environment which
// other implementations should add as test UUIDs as well.
// The device has been connected to and its attributes are ready to be
// discovered.
function getBlocklistDevice(
    options = {filters: [{services: [blocklist_test_service_uuid]}]}) {
  let device, fake_peripheral, fake_blocklist_test_service,
      fake_blocklist_exclude_reads_characteristic,
      fake_blocklist_exclude_writes_characteristic,
      fake_blocklist_descriptor,
      fake_blocklist_exclude_reads_descriptor,
      fake_blocklist_exclude_writes_descriptor;
  return setUpPreconnectedDevice({
    address: '11:11:11:11:11:11',
    name: 'Blocklist Device',
    knownServiceUUIDs: ['generic_access', blocklist_test_service_uuid],
  })
      .then(_ => fake_peripheral = _)
      .then(() => requestDeviceWithTrustedClick(options))
      .then(_ => device = _)
      .then(() => fake_peripheral.setNextGATTConnectionResponse({
        code: HCI_SUCCESS,
      }))
      .then(() => device.gatt.connect())
      .then(() => fake_peripheral.addFakeService({
        uuid: blocklist_test_service_uuid,
      }))
      .then(_ => fake_blocklist_test_service = _)
      .then(() => fake_blocklist_test_service.addFakeCharacteristic({
        uuid: blocklist_exclude_reads_characteristic_uuid,
        properties: ['read', 'write'],
      }))
      .then(_ => fake_blocklist_exclude_reads_characteristic = _)
      .then(() => fake_blocklist_test_service.addFakeCharacteristic({
        uuid: 'gap.peripheral_privacy_flag',
        properties: ['read', 'write'],
      }))
      .then(_ => fake_blocklist_exclude_writes_characteristic = _)
      .then(() => fake_blocklist_exclude_writes_characteristic
          .addFakeDescriptor({uuid: blocklist_test_descriptor_uuid}))
      .then(_ => fake_blocklist_descriptor = _)
      .then(() => fake_blocklist_exclude_writes_characteristic
          .addFakeDescriptor({uuid: blocklist_exclude_reads_descriptor_uuid}))
      .then(_ => fake_blocklist_exclude_reads_descriptor = _)
      .then(() => fake_blocklist_exclude_writes_characteristic
          .addFakeDescriptor({
            uuid: 'gatt.client_characteristic_configuration'
          }))
      .then(_ => fake_blocklist_exclude_writes_descriptor = _)
      .then(() => fake_peripheral.setNextGATTDiscoveryResponse({
        code: HCI_SUCCESS,
      }))
      .then(() => ({
        device,
        fake_peripheral,
        fake_blocklist_test_service,
        fake_blocklist_exclude_reads_characteristic,
        fake_blocklist_exclude_writes_characteristic,
        fake_blocklist_descriptor,
        fake_blocklist_exclude_reads_descriptor,
        fake_blocklist_exclude_writes_descriptor,
      }));
}

// Returns an object containing a Blocklist Test BluetoothRemoveGattService and
// its corresponding FakeRemoteGATTService.
function getBlocklistTestService() {
  let result;
  return getBlocklistDevice()
      .then(_ => result = _)
      .then(() =>
          result.device.gatt.getPrimaryService(blocklist_test_service_uuid))
      .then(service => Object.assign(result, {
        service,
        fake_service: result.fake_blocklist_test_service,
      }));
}

// Returns an object containing a blocklisted BluetoothRemoteGATTCharacteristic
// that excludes reads and its corresponding FakeRemoteGATTCharacteristic.
function getBlocklistExcludeReadsCharacteristic() {
  let result, fake_characteristic;
  return getBlocklistTestService()
      .then(_ => result = _)
      .then(() => result.service.getCharacteristic(
          blocklist_exclude_reads_characteristic_uuid))
      .then(characteristic =>
          Object.assign(
              result, {
                characteristic,
                fake_characteristic:
                    result.fake_blocklist_exclude_reads_characteristic
              }));
}

// Returns an object containing a blocklisted BluetoothRemoteGATTCharacteristic
// that excludes writes and its corresponding FakeRemoteGATTCharacteristic.
function getBlocklistExcludeWritesCharacteristic() {
  let result, fake_characteristic;
  return getBlocklistTestService()
      .then(_ => result = _)
      .then(() => result.service.getCharacteristic(
          'gap.peripheral_privacy_flag'))
      .then(characteristic =>
          Object.assign(
              result, {
                characteristic,
                fake_characteristic:
                    result.fake_blocklist_exclude_writes_characteristic
              }));
}

// Returns an object containing a blocklisted BluetoothRemoteGATTDescriptor that
// excludes reads and its corresponding FakeRemoteGATTDescriptor.
function getBlocklistExcludeReadsDescriptor() {
  let result;
  return getBlocklistExcludeWritesCharacteristic()
      .then(_ => result = _)
      .then(() => result.characteristic.getDescriptor(
          blocklist_exclude_reads_descriptor_uuid))
      .then(descriptor => Object.assign(
          result, {
            descriptor,
            fake_descriptor: result.fake_blocklist_exclude_reads_descriptor
          }));
}

// Returns an object containing a blocklisted BluetoothRemoteGATTDescriptor that
// excludes writes and its corresponding FakeRemoteGATTDescriptor.
function getBlocklistExcludeWritesDescriptor() {
  let result;
  return getBlocklistExcludeWritesCharacteristic()
      .then(_ => result = _)
      .then(() => result.characteristic.getDescriptor(
          'gatt.client_characteristic_configuration'))
      .then(descriptor => Object.assign(
          result, {
            descriptor: descriptor,
            fake_descriptor: result.fake_blocklist_exclude_writes_descriptor,
          }));
}

// Returns the same device and fake peripheral as getHealthThermometerDevice()
// after another frame (an iframe we insert) discovered the device,
// connected to it and discovered its services.
function getHealthThermometerDeviceWithServicesDiscovered(options) {
  let device, fake_peripheral, fakes;
  let iframe = document.createElement('iframe');
  return setUpConnectableHealthThermometerDevice()
    .then(_ => fake_peripheral = _)
    .then(() => populateHealthThermometerFakes(fake_peripheral))
    .then(_ => fakes = _)
    .then(() => fake_peripheral.setNextGATTDiscoveryResponse({
      code: HCI_SUCCESS,
    }))
    .then(() => new Promise(resolve => {
      let src = '/bluetooth/resources/health-thermometer-iframe.html';
      // TODO(509038): Can be removed once LayoutTests/bluetooth/* that use
      // health-thermometer-iframe.html have been moved to
      // LayoutTests/external/wpt/bluetooth/*
      if (window.location.pathname.includes('/LayoutTests/')) {
        src = '../../../external/wpt/bluetooth/resources/health-thermometer-iframe.html';
      }
      iframe.src = src;
      document.body.appendChild(iframe);
      iframe.addEventListener('load', resolve);
    }))
    .then(() => new Promise((resolve, reject) => {
      callWithTrustedClick(() => {
        iframe.contentWindow.postMessage({
          type: 'DiscoverServices',
          options: options
        }, '*');
      });

      function messageHandler(messageEvent) {
        if (messageEvent.data == 'DiscoveryComplete') {
          window.removeEventListener('message', messageHandler);
          resolve();
        } else {
          reject(new Error(`Unexpected message: ${messageEvent.data}`));
        }
      }
      window.addEventListener('message', messageHandler);
    }))
    .then(() => requestDeviceWithTrustedClick(options))
    .then(_ => device = _)
    .then(device => device.gatt.connect())
    .then(_ => Object.assign({device}, fakes));
}

// Similar to getHealthThermometerDevice() except the device has no services,
// characteristics, or descriptors.
function getEmptyHealthThermometerDevice(options) {
  return getDiscoveredHealthThermometerDevice(options)
    .then(({device, fake_peripheral}) => {
      return fake_peripheral.setNextGATTConnectionResponse({code: HCI_SUCCESS})
        .then(() => device.gatt.connect())
        .then(() => fake_peripheral.setNextGATTDiscoveryResponse({
          code: HCI_SUCCESS}))
        .then(() => ({
          device: device,
          fake_peripheral: fake_peripheral
        }));
    });
}

// Similar to getHealthThermometerService() except the service has no
// characteristics or included services.
function getEmptyHealthThermometerService(options) {
  let device;
  let fake_peripheral;
  let fake_health_thermometer;
  return getDiscoveredHealthThermometerDevice(options)
    .then(result => ({device, fake_peripheral} = result))
    .then(() => fake_peripheral.setNextGATTConnectionResponse({
      code: HCI_SUCCESS}))
    .then(() => device.gatt.connect())
    .then(() => fake_peripheral.addFakeService({uuid: 'health_thermometer'}))
    .then(s => fake_health_thermometer = s)
    .then(() => fake_peripheral.setNextGATTDiscoveryResponse({
      code: HCI_SUCCESS}))
    .then(() => device.gatt.getPrimaryService('health_thermometer'))
    .then(service => ({
      service: service,
      fake_health_thermometer: fake_health_thermometer,
    }));
}

// Returns a BluetoothDevice discovered using |options| and its
// corresponding FakePeripheral.
// The simulated device is called 'HID Device' it has three known service
// UUIDs: 'generic_access', 'device_information', 'human_interface_device'.
// The primary service with 'device_information' UUID has a characteristics
// with UUID 'serial_number_string'. The device has been connected to and its
// attributes are ready to be discovered.
function getHIDDevice(options) {
  let device, fake_peripheral;
  return getConnectedHIDDevice(options)
    .then(_ => ({device, fake_peripheral} = _))
    .then(() => fake_peripheral.setNextGATTDiscoveryResponse({
      code: HCI_SUCCESS,
    }))
    .then(() => ({device, fake_peripheral}));
}

// Similar to getHealthThermometerDevice except the GATT discovery
// response has not been set yet so more attributes can still be added.
// TODO(crbug.com/719816): Add descriptors.
function getConnectedHIDDevice(options) {
  let device, fake_peripheral;
  return setUpPreconnectedDevice({
      address: '10:10:10:10:10:10',
      name: 'HID Device',
      knownServiceUUIDs: [
        'generic_access',
        'device_information',
        'human_interface_device',
      ],
    })
    .then(_ => (fake_peripheral = _))
    .then(() => requestDeviceWithTrustedClick(options))
    .then(_ => (device = _))
    .then(() => fake_peripheral.setNextGATTConnectionResponse({
      code: HCI_SUCCESS,
    }))
    .then(() => device.gatt.connect())
    .then(() => fake_peripheral.addFakeService({
      uuid: 'generic_access',
    }))
    .then(() => fake_peripheral.addFakeService({
      uuid: 'device_information',
    }))
    // Blocklisted Characteristic:
    // https://github.com/WebBluetoothCG/registries/blob/master/gatt_blocklist.txt
    .then(dev_info => dev_info.addFakeCharacteristic({
      uuid: 'serial_number_string',
      properties: ['read'],
    }))
    .then(() => fake_peripheral.addFakeService({
      uuid: 'human_interface_device',
    }))
    .then(() => ({device, fake_peripheral}));
}

// Similar to getHealthThermometerDevice() except the device
// is not connected and thus its services have not been
// discovered.
function getDiscoveredHealthThermometerDevice(
  options = {filters: [{services: ['health_thermometer']}]}) {
  return setUpHealthThermometerDevice()
  .then(fake_peripheral => {
    return requestDeviceWithTrustedClick(options)
      .then(device => ({
        device: device,
        fake_peripheral: fake_peripheral
      }));
  });
}