// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import {
  getElementWithinComponent,
  getEventPromise,
  renderElementIntoDOM,
} from '../../../testing/DOMHelpers.js';
import {describeWithLocale} from '../../../testing/EnvironmentHelpers.js';

import * as LinearMemoryInspectorComponents from './components.js';

const DISPLAY_SELECTOR = 'devtools-linear-memory-inspector-interpreter-display';
const SETTINGS_SELECTOR = 'devtools-linear-memory-inspector-interpreter-settings';
const TOOLBAR_SELECTOR = '.settings-toolbar';
export const ENDIANNESS_SELECTOR = '[data-endianness]';

function assertSettingsRenders(component: HTMLElement) {
  const settings = getElementWithinComponent(
      component, SETTINGS_SELECTOR, LinearMemoryInspectorComponents.ValueInterpreterSettings.ValueInterpreterSettings);
  assert.isNotNull(settings);
}

function assertDisplayRenders(component: HTMLElement) {
  const display = getElementWithinComponent(
      component, DISPLAY_SELECTOR, LinearMemoryInspectorComponents.ValueInterpreterDisplay.ValueInterpreterDisplay);
  assert.isNotNull(display);
}

function clickSettingsButton(
    component: LinearMemoryInspectorComponents.LinearMemoryValueInterpreter.LinearMemoryValueInterpreter) {
  const settingsButton = getElementWithinComponent(component, '[data-settings]', HTMLButtonElement);
  settingsButton.click();
}

describeWithLocale('LinearMemoryValueInterpreter', () => {
  function setUpComponent() {
    const buffer = new Uint8Array([34, 234, 12, 3]).buffer;
    const component = new LinearMemoryInspectorComponents.LinearMemoryValueInterpreter.LinearMemoryValueInterpreter();
    component.data = {
      value: buffer,
      endianness: LinearMemoryInspectorComponents.ValueInterpreterDisplayUtils.Endianness.LITTLE,
      valueTypes: new Set([LinearMemoryInspectorComponents.ValueInterpreterDisplayUtils.ValueType.INT8]),
      memoryLength: buffer.byteLength,
    };
    renderElementIntoDOM(component);
    return component;
  }

  it('renders the settings toolbar', () => {
    const component = setUpComponent();
    const settingsToolbar = getElementWithinComponent(component, TOOLBAR_SELECTOR, HTMLDivElement);
    assert.isNotNull(settingsToolbar);
  });

  it('renders value display as default', () => {
    const component = setUpComponent();
    assertDisplayRenders(component);
  });

  it('switches between value display and value settings', () => {
    const component = setUpComponent();
    assertDisplayRenders(component);

    clickSettingsButton(component);

    assertSettingsRenders(component);
  });

  it('listens on TypeToggleEvents', async () => {
    const component = setUpComponent();
    clickSettingsButton(component);

    const settings = getElementWithinComponent(
        component, SETTINGS_SELECTOR,
        LinearMemoryInspectorComponents.ValueInterpreterSettings.ValueInterpreterSettings);
    const eventPromise =
        getEventPromise<LinearMemoryInspectorComponents.LinearMemoryValueInterpreter.ValueTypeToggledEvent>(
            component, 'valuetypetoggled');
    const expectedType = LinearMemoryInspectorComponents.ValueInterpreterDisplayUtils.ValueType.FLOAT64;
    const expectedChecked = true;
    const typeToggleEvent =
        new LinearMemoryInspectorComponents.ValueInterpreterSettings.TypeToggleEvent(expectedType, expectedChecked);
    settings.dispatchEvent(typeToggleEvent);

    const event = await eventPromise;
    assert.strictEqual(event.data.type, expectedType);
    assert.strictEqual(event.data.checked, expectedChecked);
  });

  it('renders the endianness options', () => {
    const component = setUpComponent();
    const input = getElementWithinComponent(component, ENDIANNESS_SELECTOR, HTMLSelectElement);
    assert.deepEqual(input.value, LinearMemoryInspectorComponents.ValueInterpreterDisplayUtils.Endianness.LITTLE);
    const options = input.querySelectorAll('option');
    const endiannessSettings = Array.from(options).map(option => option.value);
    assert.deepEqual(endiannessSettings, [
      LinearMemoryInspectorComponents.ValueInterpreterDisplayUtils.Endianness.LITTLE,
      LinearMemoryInspectorComponents.ValueInterpreterDisplayUtils.Endianness.BIG,
    ]);
  });

  it('triggers an event on changing endianness', async () => {
    const component = setUpComponent();
    const input = getElementWithinComponent(component, ENDIANNESS_SELECTOR, HTMLSelectElement);

    const eventPromise =
        getEventPromise<LinearMemoryInspectorComponents.LinearMemoryValueInterpreter.EndiannessChangedEvent>(
            component, 'endiannesschanged');
    const changeEvent = new Event('change');
    input.dispatchEvent(changeEvent);

    const event = await eventPromise;
    assert.deepEqual(event.data, LinearMemoryInspectorComponents.ValueInterpreterDisplayUtils.Endianness.LITTLE);
  });
});