// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import * as i18n from '../../core/i18n/i18n.js';
import * as SDK from '../../core/sdk/sdk.js';
import * as Buttons from '../../ui/components/buttons/buttons.js';
import * as UIHelpers from '../../ui/helpers/helpers.js';
import * as UI from '../../ui/legacy/legacy.js';
import {html, render, type TemplateResult} from '../../ui/lit/lit.js';
import * as VisualLogging from '../../ui/visual_logging/visual_logging.js';

import {ElementsPanel} from './ElementsPanel.js';
import elementStatePaneWidgetStyles from './elementStatePaneWidget.css.js';

const {bindToSetting} = UI.UIUtils;

const UIStrings = {
  /**
   * @description Title of a section in the Element State Pane Widget of the Elements panel. The
   * controls in this section allow users to force a particular state on the selected element, e.g. a
   * focused state via :focus or a hover state via :hover.
   */
  forceElementState: 'Force element state',
  /**
   * @description Tooltip text in Element State Pane Widget of the Elements panel. For a button that
   * opens a tool that toggles the various states of the selected element on/off.
   */
  toggleElementState: 'Toggle Element State',
  /**
   * @description The name of a checkbox setting in the Element & Page State Pane Widget of the Elements panel.. This setting
   * emulates/pretends that the webpage is focused.
   */
  emulateFocusedPage: 'Emulate a focused page',
  /**
   * @description Explanation text for the 'Emulate a focused page' setting in the Rendering tool.
   */
  emulatesAFocusedPage: 'Keep page focused. Commonly used for debugging disappearing elements.',
  /**
   * @description Similar with forceElementState but allows users to force specific state of the selected element.
   */
  forceElementSpecificStates: 'Force specific element state',
  /**
   * @description Text that is usually a hyperlink to more documentation
   */
  learnMore: 'Learn more',
} as const;
const str_ = i18n.i18n.registerUIStrings('panels/elements/ElementStatePaneWidget.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);
enum SpecificPseudoStates {
  ENABLED = 'enabled',
  DISABLED = 'disabled',
  VALID = 'valid',
  INVALID = 'invalid',
  USER_VALID = 'user-valid',
  USER_INVALID = 'user-invalid',
  REQUIRED = 'required',
  OPTIONAL = 'optional',
  READ_ONLY = 'read-only',
  READ_WRITE = 'read-write',
  IN_RANGE = 'in-range',
  OUT_OF_RANGE = 'out-of-range',
  VISITED = 'visited',
  LINK = 'link',
  CHECKED = 'checked',
  INDETERMINATE = 'indeterminate',
  PLACEHOLDER_SHOWN = 'placeholder-shown',
  AUTOFILL = 'autofill',
  OPEN = 'open',
  TARGET_CURRENT = 'target-current',
}

interface ElementState {
  state: string;
  checked?: boolean;
  disabled?: boolean;
  hidden?: boolean;
  type: 'persistent'|'specific';
}

interface ViewInput {
  states: ElementState[];
  onStateCheckboxClicked: (event: MouseEvent) => void;
}

type View = (input: ViewInput, output: object, target: HTMLElement) => void;

export const DEFAULT_VIEW: View = (input, _output, target) => {
  const createElementStateCheckbox = (state: ElementState): TemplateResult => {
    // clang-format off
    return html`
        <div id=${state.state}>
          <devtools-checkbox class="small" @click=${input.onStateCheckboxClicked}
              jslog=${VisualLogging.toggle(state.state).track({change: true})} ?checked=${state.checked} ?disabled=${state.disabled}
              title=${':' + state.state}>
          <span class="source-code">${':' + state.state}</span>
        </devtools-checkbox>
        </div>`;
    // clang-format on
  };

  // clang-format off
  render(html`
    <style>${elementStatePaneWidgetStyles}</style>
    <div class="styles-element-state-pane"
        jslog=${VisualLogging.pane('element-states')}>
      <div class="page-state-checkbox">
        <devtools-checkbox class="small" title=${i18nString(UIStrings.emulatesAFocusedPage)}
            ${bindToSetting('emulate-page-focus')}>${
          i18nString(UIStrings.emulateFocusedPage)}</devtools-checkbox>
        <devtools-button
            @click=${() => UIHelpers.openInNewTab('https://developer.chrome.com/docs/devtools/rendering/apply-effects#emulate_a_focused_page')}
           .data=${{
              variant: Buttons.Button.Variant.ICON,
              iconName: 'help',
              size: Buttons.Button.Size.SMALL,
              jslogContext: 'learn-more',
              title: i18nString(UIStrings.learnMore),
            } as Buttons.Button.ButtonData}></devtools-button>
      </div>
      <div class="section-header">
        <span>${i18nString(UIStrings.forceElementState)}</span>
      </div>
      <div class="pseudo-states-container" role="presentation">
        ${input.states.filter(({type}) => type === 'persistent').map(state => createElementStateCheckbox(state))}
      </div>
      <details class="specific-details" ?hidden=${input.states.filter(({type}) => type === 'specific') .every(state => state.hidden)}>
        <summary class="force-specific-element-header section-header">
          <span>${i18nString(UIStrings.forceElementSpecificStates)}</span>
        </summary>
        <div class="pseudo-states-container specific-pseudo-states" role="presentation">
          ${input.states
              .filter(({type, hidden}) => type === 'specific' && !hidden)
              .map(state => createElementStateCheckbox(state))}
        </div>
      </details>
    </div>`, target);
  // clang-format on
};

export class ElementStatePaneWidget extends UI.Widget.Widget {
  readonly #duals: Map<SpecificPseudoStates, SpecificPseudoStates>;
  #cssModel?: SDK.CSSModel.CSSModel|null;
  readonly #states = new Map<string, ElementState>();
  readonly #view: View;

  constructor(view: View = DEFAULT_VIEW) {
    super({useShadowDom: true});
    this.#view = view;
    this.#duals = new Map();
    const setDualStateCheckboxes = (first: SpecificPseudoStates, second: SpecificPseudoStates): void => {
      this.#duals.set(first, second);
      this.#duals.set(second, first);
    };

    // Populate element states
    this.#states.set('active', {state: 'active', type: 'persistent'});
    this.#states.set('hover', {state: 'hover', type: 'persistent'});
    this.#states.set('focus', {state: 'focus', type: 'persistent'});
    this.#states.set('focus-within', {state: 'focus-within', type: 'persistent'});
    this.#states.set('focus-visible', {state: 'focus-visible', type: 'persistent'});
    this.#states.set('target', {state: 'target', type: 'persistent'});

    this.#states.set(SpecificPseudoStates.ENABLED, {state: SpecificPseudoStates.ENABLED, type: 'specific'});
    this.#states.set(SpecificPseudoStates.DISABLED, {state: SpecificPseudoStates.DISABLED, type: 'specific'});
    this.#states.set(SpecificPseudoStates.VALID, {state: SpecificPseudoStates.VALID, type: 'specific'});
    this.#states.set(SpecificPseudoStates.INVALID, {state: SpecificPseudoStates.INVALID, type: 'specific'});
    this.#states.set(SpecificPseudoStates.USER_VALID, {state: SpecificPseudoStates.USER_VALID, type: 'specific'});
    this.#states.set(SpecificPseudoStates.USER_INVALID, {state: SpecificPseudoStates.USER_INVALID, type: 'specific'});
    this.#states.set(SpecificPseudoStates.REQUIRED, {state: SpecificPseudoStates.REQUIRED, type: 'specific'});
    this.#states.set(SpecificPseudoStates.OPTIONAL, {state: SpecificPseudoStates.OPTIONAL, type: 'specific'});
    this.#states.set(SpecificPseudoStates.READ_ONLY, {state: SpecificPseudoStates.READ_ONLY, type: 'specific'});
    this.#states.set(SpecificPseudoStates.READ_WRITE, {state: SpecificPseudoStates.READ_WRITE, type: 'specific'});
    this.#states.set(SpecificPseudoStates.IN_RANGE, {state: SpecificPseudoStates.IN_RANGE, type: 'specific'});
    this.#states.set(SpecificPseudoStates.OUT_OF_RANGE, {state: SpecificPseudoStates.OUT_OF_RANGE, type: 'specific'});
    this.#states.set(SpecificPseudoStates.VISITED, {state: SpecificPseudoStates.VISITED, type: 'specific'});
    this.#states.set(SpecificPseudoStates.LINK, {state: SpecificPseudoStates.LINK, type: 'specific'});
    this.#states.set(SpecificPseudoStates.CHECKED, {state: SpecificPseudoStates.CHECKED, type: 'specific'});
    this.#states.set(SpecificPseudoStates.INDETERMINATE, {state: SpecificPseudoStates.INDETERMINATE, type: 'specific'});
    this.#states.set(
        SpecificPseudoStates.PLACEHOLDER_SHOWN, {state: SpecificPseudoStates.PLACEHOLDER_SHOWN, type: 'specific'});
    this.#states.set(SpecificPseudoStates.AUTOFILL, {state: SpecificPseudoStates.AUTOFILL, type: 'specific'});
    this.#states.set(SpecificPseudoStates.OPEN, {state: SpecificPseudoStates.OPEN, type: 'specific'});
    this.#states.set(
        SpecificPseudoStates.TARGET_CURRENT, {state: SpecificPseudoStates.TARGET_CURRENT, type: 'specific'});

    setDualStateCheckboxes(SpecificPseudoStates.VALID, SpecificPseudoStates.INVALID);
    setDualStateCheckboxes(SpecificPseudoStates.USER_VALID, SpecificPseudoStates.USER_INVALID);
    setDualStateCheckboxes(SpecificPseudoStates.READ_ONLY, SpecificPseudoStates.READ_WRITE);
    setDualStateCheckboxes(SpecificPseudoStates.IN_RANGE, SpecificPseudoStates.OUT_OF_RANGE);
    setDualStateCheckboxes(SpecificPseudoStates.ENABLED, SpecificPseudoStates.DISABLED);
    setDualStateCheckboxes(SpecificPseudoStates.VISITED, SpecificPseudoStates.LINK);

    UI.Context.Context.instance().addFlavorChangeListener(SDK.DOMModel.DOMNode, this.requestUpdate, this);
  }

  private onStateCheckboxClicked(event: MouseEvent): void {
    const node = UI.Context.Context.instance().flavor(SDK.DOMModel.DOMNode);
    if (!node || !(event.target instanceof UI.UIUtils.CheckboxLabel)) {
      return;
    }
    const state = event.target.title.slice(1);
    if (!state) {
      return;
    }
    const checked = event.target.checked;
    const dual = this.#duals.get(state as SpecificPseudoStates);
    if (checked && dual) {
      node.domModel().cssModel().forcePseudoState(node, dual, false);
    }
    node.domModel().cssModel().forcePseudoState(node, state, checked);
  }

  private updateModel(cssModel: SDK.CSSModel.CSSModel|null): void {
    if (this.#cssModel === cssModel) {
      return;
    }
    if (this.#cssModel) {
      this.#cssModel.removeEventListener(SDK.CSSModel.Events.PseudoStateForced, this.requestUpdate, this);
    }
    this.#cssModel = cssModel;
    if (this.#cssModel) {
      this.#cssModel.addEventListener(SDK.CSSModel.Events.PseudoStateForced, this.requestUpdate, this);
    }
  }

  override wasShown(): void {
    super.wasShown();
    this.requestUpdate();
  }

  override async performUpdate(): Promise<void> {
    let node = UI.Context.Context.instance().flavor(SDK.DOMModel.DOMNode);
    if (node) {
      node = node.enclosingElementOrSelf();
    }
    this.updateModel(node ? node.domModel().cssModel() : null);
    if (node) {
      const nodePseudoState = node.domModel().cssModel().pseudoState(node);
      for (const state of this.#states.values()) {
        state.disabled = Boolean(node.pseudoType());
        state.checked = Boolean(nodePseudoState && nodePseudoState.indexOf(state.state) >= 0);
      }
    } else {
      for (const state of this.#states.values()) {
        state.disabled = true;
        state.checked = false;
      }
    }
    await this.#updateElementSpecificStatesTable(node);
    ButtonProvider.instance().item().setToggled([...this.#states.values()].some(input => input.checked));
    const viewInput = {
      states: [...this.#states.values()],
      onStateCheckboxClicked: this.onStateCheckboxClicked.bind(this),
    };
    this.#view(viewInput, {}, this.contentElement);
  }

  async #updateElementSpecificStatesTable(node: SDK.DOMModel.DOMNode|null = null): Promise<void> {
    if (!node || node.nodeType() !== Node.ELEMENT_NODE) {
      [...this.#states.values()].filter(({type}) => type === 'specific').forEach(state => {
        state.hidden = true;
      });
      return;
    }
    const hideSpecificCheckbox = (pseudoClass: SpecificPseudoStates, hide: boolean): void => {
      const state = this.#states.get(pseudoClass);
      if (state) {
        state.hidden = hide;
      }
    };
    const isElementOfTypes = (node: SDK.DOMModel.DOMNode, types: string[]): boolean => {
      return types.includes(node.nodeName()?.toLowerCase());
    };
    const isAnchorElementWithHref = (node: SDK.DOMModel.DOMNode): boolean => {
      return isElementOfTypes(node, ['a']) && node.getAttribute('href') !== undefined;
    };
    const isInputWithTypeRadioOrCheckbox = (node: SDK.DOMModel.DOMNode): boolean => {
      return isElementOfTypes(node, ['input']) &&
          (node.getAttribute('type') === 'checkbox' || node.getAttribute('type') === 'radio');
    };
    const isContentEditable = (node: SDK.DOMModel.DOMNode): boolean => {
      return node.getAttribute('contenteditable') !== undefined ||
          Boolean(node.parentNode && isContentEditable(node.parentNode));
    };
    const isDisabled = (node: SDK.DOMModel.DOMNode): boolean => {
      return node.getAttribute('disabled') !== undefined;
    };
    const isMutable = (node: SDK.DOMModel.DOMNode): boolean => {
      if (isElementOfTypes(node, ['input', 'textarea'])) {
        return node.getAttribute('readonly') === undefined && !isDisabled(node);
      }
      return isContentEditable(node);
    };
    // An autonomous custom element is called a form-associated custom element if the element is associated with a custom element definition whose form-associated field is set to true.
    // https://html.spec.whatwg.org/multipage/custom-elements.html#form-associated-custom-element
    const isFormAssociatedCustomElement = async(node: SDK.DOMModel.DOMNode): Promise<boolean> => {
      function getFormAssociatedField(this: HTMLElement): boolean {
        return ('formAssociated' in this.constructor && this.constructor.formAssociated === true);
      }
      const response = await node.callFunction(getFormAssociatedField);
      return response ? response.value : false;
    };
    const isFormAssociated = await isFormAssociatedCustomElement(node);

    if (isElementOfTypes(node, ['button', 'input', 'select', 'textarea', 'optgroup', 'option', 'fieldset']) ||
        isFormAssociated) {
      hideSpecificCheckbox(SpecificPseudoStates.ENABLED, !isDisabled(node));
      hideSpecificCheckbox(SpecificPseudoStates.DISABLED, isDisabled(node));
    } else {
      hideSpecificCheckbox(SpecificPseudoStates.ENABLED, true);
      hideSpecificCheckbox(SpecificPseudoStates.DISABLED, true);
    }

    if (isElementOfTypes(node, ['button', 'fieldset', 'input', 'object', 'output', 'select', 'textarea', 'img']) ||
        isFormAssociated) {
      hideSpecificCheckbox(SpecificPseudoStates.VALID, false);
      hideSpecificCheckbox(SpecificPseudoStates.INVALID, false);
    } else {
      hideSpecificCheckbox(SpecificPseudoStates.VALID, true);
      hideSpecificCheckbox(SpecificPseudoStates.INVALID, true);
    }

    if (isElementOfTypes(node, ['input', 'select', 'textarea'])) {
      hideSpecificCheckbox(SpecificPseudoStates.USER_VALID, false);
      hideSpecificCheckbox(SpecificPseudoStates.USER_INVALID, false);
      if (node.getAttribute('required') === undefined) {
        hideSpecificCheckbox(SpecificPseudoStates.REQUIRED, false);
        hideSpecificCheckbox(SpecificPseudoStates.OPTIONAL, true);
      } else {
        hideSpecificCheckbox(SpecificPseudoStates.REQUIRED, true);
        hideSpecificCheckbox(SpecificPseudoStates.OPTIONAL, false);
      }
    } else {
      hideSpecificCheckbox(SpecificPseudoStates.USER_VALID, true);
      hideSpecificCheckbox(SpecificPseudoStates.USER_INVALID, true);
      hideSpecificCheckbox(SpecificPseudoStates.REQUIRED, true);
      hideSpecificCheckbox(SpecificPseudoStates.OPTIONAL, true);
    }

    if (isMutable(node)) {
      hideSpecificCheckbox(SpecificPseudoStates.READ_WRITE, true);
      hideSpecificCheckbox(SpecificPseudoStates.READ_ONLY, false);
    } else {
      hideSpecificCheckbox(SpecificPseudoStates.READ_WRITE, false);
      hideSpecificCheckbox(SpecificPseudoStates.READ_ONLY, true);
    }

    if (isElementOfTypes(node, ['input']) &&
        (node.getAttribute('min') !== undefined || node.getAttribute('max') !== undefined)) {
      hideSpecificCheckbox(SpecificPseudoStates.IN_RANGE, false);
      hideSpecificCheckbox(SpecificPseudoStates.OUT_OF_RANGE, false);
    } else {
      hideSpecificCheckbox(SpecificPseudoStates.IN_RANGE, true);
      hideSpecificCheckbox(SpecificPseudoStates.OUT_OF_RANGE, true);
    }

    if (isElementOfTypes(node, ['a', 'area']) && node.getAttribute('href') !== undefined) {
      hideSpecificCheckbox(SpecificPseudoStates.VISITED, false);
      hideSpecificCheckbox(SpecificPseudoStates.LINK, false);
    } else {
      hideSpecificCheckbox(SpecificPseudoStates.VISITED, true);
      hideSpecificCheckbox(SpecificPseudoStates.LINK, true);
    }

    if (isInputWithTypeRadioOrCheckbox(node) || isElementOfTypes(node, ['option'])) {
      hideSpecificCheckbox(SpecificPseudoStates.CHECKED, false);
    } else {
      hideSpecificCheckbox(SpecificPseudoStates.CHECKED, true);
    }

    if (isInputWithTypeRadioOrCheckbox(node) || isElementOfTypes(node, ['progress'])) {
      hideSpecificCheckbox(SpecificPseudoStates.INDETERMINATE, false);
    } else {
      hideSpecificCheckbox(SpecificPseudoStates.INDETERMINATE, true);
    }

    if (isElementOfTypes(node, ['input', 'textarea'])) {
      hideSpecificCheckbox(SpecificPseudoStates.PLACEHOLDER_SHOWN, false);
    } else {
      hideSpecificCheckbox(SpecificPseudoStates.PLACEHOLDER_SHOWN, true);
    }

    if (isElementOfTypes(node, ['input'])) {
      hideSpecificCheckbox(SpecificPseudoStates.AUTOFILL, false);
    } else {
      hideSpecificCheckbox(SpecificPseudoStates.AUTOFILL, true);
    }

    if (isElementOfTypes(node, ['input', 'select', 'dialog', 'details'])) {
      hideSpecificCheckbox(SpecificPseudoStates.OPEN, false);
    } else {
      hideSpecificCheckbox(SpecificPseudoStates.OPEN, true);
    }

    if (isAnchorElementWithHref(node) || node.pseudoType() === 'scroll-marker') {
      hideSpecificCheckbox(SpecificPseudoStates.TARGET_CURRENT, false);
    } else {
      hideSpecificCheckbox(SpecificPseudoStates.TARGET_CURRENT, true);
    }
  }
}

let buttonProviderInstance: ButtonProvider;
export class ButtonProvider implements UI.Toolbar.Provider {
  private readonly button: UI.Toolbar.ToolbarToggle;
  private view: ElementStatePaneWidget;
  private constructor() {
    this.button = new UI.Toolbar.ToolbarToggle(i18nString(UIStrings.toggleElementState), 'hover');
    this.button.addEventListener(UI.Toolbar.ToolbarButton.Events.CLICK, this.clicked, this);
    this.button.element.classList.add('element-state');
    this.button.element.setAttribute('jslog', `${VisualLogging.toggleSubpane('element-states').track({click: true})}`);
    this.button.element.style.setProperty('--dot-toggle-top', '12px');
    this.button.element.style.setProperty('--dot-toggle-left', '18px');
    this.view = new ElementStatePaneWidget();
  }
  static instance(opts: {
    forceNew: boolean|null,
  } = {forceNew: null}): ButtonProvider {
    const {forceNew} = opts;
    if (!buttonProviderInstance || forceNew) {
      buttonProviderInstance = new ButtonProvider();
    }
    return buttonProviderInstance;
  }
  private clicked(): void {
    ElementsPanel.instance().showToolbarPane(!this.view.isShowing() ? this.view : null, this.button);
  }
  item(): UI.Toolbar.ToolbarToggle {
    return this.button;
  }
}