// Copyright 2021 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.

/*
 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
 * Copyright (C) 2011 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import type * as Common from '../../core/common/common.js';
import * as Host from '../../core/host/host.js';
import * as i18n from '../../core/i18n/i18n.js';
import * as SDK from '../../core/sdk/sdk.js';
import * as Protocol from '../../generated/protocol.js';
import * as SourceMapScopes from '../../models/source_map_scopes/source_map_scopes.js';
import * as LinearMemoryInspector from '../../ui/components/linear_memory_inspector/linear_memory_inspector.js';
import * as ObjectUI from '../../ui/legacy/components/object_ui/object_ui.js';
import * as Components from '../../ui/legacy/components/utils/utils.js';
import * as UI from '../../ui/legacy/legacy.js';

import scopeChainSidebarPaneStyles from './scopeChainSidebarPane.css.js';

const UIStrings = {
  /**
  *@description Loading indicator in Scope Sidebar Pane of the Sources panel
  */
  loading: 'Loading...',
  /**
  *@description Not paused message element text content in Call Stack Sidebar Pane of the Sources panel
  */
  notPaused: 'Not paused',
  /**
  *@description Empty placeholder in Scope Chain Sidebar Pane of the Sources panel
  */
  noVariables: 'No variables',
  /**
  *@description Text in the Sources panel Scope pane describing a closure scope.
  *@example {func} PH1
  */
  closureS: 'Closure ({PH1})',
  /**
  *@description Text that refers to closure as a programming term
  */
  closure: 'Closure',
  /**
  *@description Text in Scope Chain Sidebar Pane of the Sources panel
  */
  exception: 'Exception',
  /**
  *@description Text in Scope Chain Sidebar Pane of the Sources panel
  */
  returnValue: 'Return value',
  /**
  *@description A context menu item in the Scope View of the Sources Panel
  */
  revealInMemoryInspectorPanel: 'Reveal in Memory Inspector panel',
};
const str_ = i18n.i18n.registerUIStrings('panels/sources/ScopeChainSidebarPane.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);
let scopeChainSidebarPaneInstance: ScopeChainSidebarPane;

export class ScopeChainSidebarPane extends UI.Widget.VBox implements UI.ContextFlavorListener.ContextFlavorListener {
  private readonly treeOutline: ObjectUI.ObjectPropertiesSection.ObjectPropertiesSectionsTreeOutline;
  private readonly expandController: ObjectUI.ObjectPropertiesSection.ObjectPropertiesSectionsTreeExpandController;
  private readonly linkifier: Components.Linkifier.Linkifier;
  private infoElement: HTMLDivElement;
  #scopesScript: SDK.Script.Script|null = null;

  private constructor() {
    super(true);

    this.treeOutline = new ObjectUI.ObjectPropertiesSection.ObjectPropertiesSectionsTreeOutline();

    this.treeOutline.setShowSelectionOnKeyboardFocus(/* show */ true);
    this.expandController =
        new ObjectUI.ObjectPropertiesSection.ObjectPropertiesSectionsTreeExpandController(this.treeOutline);
    this.linkifier = new Components.Linkifier.Linkifier();
    this.infoElement = document.createElement('div');
    this.infoElement.className = 'gray-info-message';
    this.infoElement.tabIndex = -1;
    SDK.TargetManager.TargetManager.instance().addModelListener(
        SDK.DebuggerModel.DebuggerModel, SDK.DebuggerModel.Events.DebugInfoAttached, this.debugInfoAttached, this);
    void this.update();
  }

  static instance(): ScopeChainSidebarPane {
    if (!scopeChainSidebarPaneInstance) {
      scopeChainSidebarPaneInstance = new ScopeChainSidebarPane();
    }
    return scopeChainSidebarPaneInstance;
  }

  flavorChanged(_object: Object|null): void {
    void this.update();
  }

  focus(): void {
    if (this.hasFocus()) {
      return;
    }

    if (UI.Context.Context.instance().flavor(SDK.DebuggerModel.DebuggerPausedDetails)) {
      this.treeOutline.forceSelect();
    }
  }

  private sourceMapAttached(
      event: Common.EventTarget.EventTargetEvent<{client: SDK.Script.Script, sourceMap: SDK.SourceMap.SourceMap}>):
      void {
    if (event.data.client === this.#scopesScript) {
      void this.update();
    }
  }

  private setScopeSourceMapSubscription(callFrame: SDK.DebuggerModel.CallFrame|null): void {
    const oldScript = this.#scopesScript;
    this.#scopesScript = callFrame?.script ?? null;

    // Shortcut for the case when we are listening to the same model.
    if (oldScript?.debuggerModel === this.#scopesScript?.debuggerModel) {
      return;
    }

    if (oldScript) {
      oldScript.debuggerModel.sourceMapManager().removeEventListener(
          SDK.SourceMapManager.Events.SourceMapAttached, this.sourceMapAttached, this);
    }

    if (this.#scopesScript) {
      this.#scopesScript.debuggerModel.sourceMapManager().addEventListener(
          SDK.SourceMapManager.Events.SourceMapAttached, this.sourceMapAttached, this);
    }
  }

  private debugInfoAttached(event: Common.EventTarget.EventTargetEvent<SDK.Script.Script>): void {
    if (event.data === this.#scopesScript) {
      void this.update();
    }
  }

  private async update(): Promise<void> {
    // The `resolveThisObject(callFrame)` and `resolveScopeChain(callFrame)` calls
    // below may take a while to complete, so indicate to the user that something
    // is happening (see https://crbug.com/1162416).
    this.infoElement.textContent = i18nString(UIStrings.loading);
    this.contentElement.removeChildren();
    this.contentElement.appendChild(this.infoElement);

    this.linkifier.reset();

    const callFrame = UI.Context.Context.instance().flavor(SDK.DebuggerModel.CallFrame);
    this.setScopeSourceMapSubscription(callFrame);
    const [thisObject, scopeChain] = await Promise.all([
      SourceMapScopes.NamesResolver.resolveThisObject(callFrame),
      SourceMapScopes.NamesResolver.resolveScopeChain(callFrame),
    ]);
    // By now the developer might have moved on, and we don't want to show stale
    // scope information, so check again that we're still on the same CallFrame.
    if (callFrame === UI.Context.Context.instance().flavor(SDK.DebuggerModel.CallFrame)) {
      const details = UI.Context.Context.instance().flavor(SDK.DebuggerModel.DebuggerPausedDetails);
      this.treeOutline.removeChildren();

      if (!details || !callFrame || !scopeChain) {
        this.infoElement.textContent = i18nString(UIStrings.notPaused);
        return;
      }

      this.contentElement.removeChildren();
      this.contentElement.appendChild(this.treeOutline.element);
      let foundLocalScope = false;
      for (let i = 0; i < scopeChain.length; ++i) {
        const scope = scopeChain[i];
        const extraProperties = this.extraPropertiesForScope(scope, details, callFrame, thisObject, i === 0);

        if (scope.type() === Protocol.Debugger.ScopeType.Local) {
          foundLocalScope = true;
        }

        const section = this.createScopeSectionTreeElement(scope, extraProperties);
        if (scope.type() === Protocol.Debugger.ScopeType.Global) {
          section.collapse();
        } else if (!foundLocalScope || scope.type() === Protocol.Debugger.ScopeType.Local) {
          section.expand();
        }

        this.treeOutline.appendChild(section);
        if (i === 0) {
          section.select(/* omitFocus */ true);
        }
      }
      this.sidebarPaneUpdatedForTest();
    }
  }

  private createScopeSectionTreeElement(
      scope: SDK.DebuggerModel.ScopeChainEntry,
      extraProperties: SDK.RemoteObject.RemoteObjectProperty[]): ObjectUI.ObjectPropertiesSection.RootElement {
    let emptyPlaceholder: Common.UIString.LocalizedString|null = null;
    if (scope.type() === Protocol.Debugger.ScopeType.Local || Protocol.Debugger.ScopeType.Closure) {
      emptyPlaceholder = i18nString(UIStrings.noVariables);
    }

    let title = scope.typeName();
    if (scope.type() === Protocol.Debugger.ScopeType.Closure) {
      const scopeName = scope.name();
      if (scopeName) {
        title = i18nString(UIStrings.closureS, {PH1: UI.UIUtils.beautifyFunctionName(scopeName)});
      } else {
        title = i18nString(UIStrings.closure);
      }
    }
    let subtitle: string|null = scope.description();
    if (!title || title === subtitle) {
      subtitle = null;
    }
    const icon = scope.icon();

    const titleElement = document.createElement('div');
    titleElement.classList.add('scope-chain-sidebar-pane-section-header');
    titleElement.classList.add('tree-element-title');
    if (icon) {
      const iconElement = document.createElement('img');
      iconElement.classList.add('scope-chain-sidebar-pane-section-icon');
      iconElement.src = icon;
      titleElement.appendChild(iconElement);
    }
    titleElement.createChild('div', 'scope-chain-sidebar-pane-section-subtitle').textContent = subtitle;
    titleElement.createChild('div', 'scope-chain-sidebar-pane-section-title').textContent = title;

    const section = new ObjectUI.ObjectPropertiesSection.RootElement(
        SourceMapScopes.NamesResolver.resolveScopeInObject(scope), this.linkifier, emptyPlaceholder,
        ObjectUI.ObjectPropertiesSection.ObjectPropertiesMode.All, extraProperties);
    section.title = titleElement;
    section.listItemElement.classList.add('scope-chain-sidebar-pane-section');
    section.listItemElement.setAttribute('aria-label', title);
    this.expandController.watchSection(title + (subtitle ? ':' + subtitle : ''), section);

    return section;
  }

  private extraPropertiesForScope(
      scope: SDK.DebuggerModel.ScopeChainEntry, details: SDK.DebuggerModel.DebuggerPausedDetails,
      callFrame: SDK.DebuggerModel.CallFrame, thisObject: SDK.RemoteObject.RemoteObject|null,
      isFirstScope: boolean): SDK.RemoteObject.RemoteObjectProperty[] {
    if (scope.type() !== Protocol.Debugger.ScopeType.Local || callFrame.script.isWasm()) {
      return [];
    }

    const extraProperties = [];
    if (thisObject) {
      extraProperties.push(new SDK.RemoteObject.RemoteObjectProperty(
          'this', thisObject, undefined, undefined, undefined, undefined, undefined, /* synthetic */ true));
    }
    if (isFirstScope) {
      const exception = details.exception();
      if (exception) {
        extraProperties.push(new SDK.RemoteObject.RemoteObjectProperty(
            i18nString(UIStrings.exception), exception, undefined, undefined, undefined, undefined, undefined,
            /* synthetic */ true));
      }
      const returnValue = callFrame.returnValue();
      if (returnValue) {
        extraProperties.push(new SDK.RemoteObject.RemoteObjectProperty(
            i18nString(UIStrings.returnValue), returnValue, undefined, undefined, undefined, undefined, undefined,
            /* synthetic */ true, callFrame.setReturnValue.bind(callFrame)));
      }
    }

    return extraProperties;
  }

  private sidebarPaneUpdatedForTest(): void {
  }
  wasShown(): void {
    super.wasShown();
    this.treeOutline.registerCSSFiles([scopeChainSidebarPaneStyles]);
    this.registerCSSFiles([scopeChainSidebarPaneStyles]);
  }
}

let openLinearMemoryInspectorInstance: OpenLinearMemoryInspector;

export class OpenLinearMemoryInspector extends UI.Widget.VBox implements UI.ContextMenu.Provider {
  static instance(opts: {
    forceNew: boolean|null,
  } = {forceNew: null}): OpenLinearMemoryInspector {
    const {forceNew} = opts;
    if (!openLinearMemoryInspectorInstance || forceNew) {
      openLinearMemoryInspectorInstance = new OpenLinearMemoryInspector();
    }

    return openLinearMemoryInspectorInstance;
  }

  appendApplicableItems(event: Event, contextMenu: UI.ContextMenu.ContextMenu, target: Object): void {
    if (target instanceof ObjectUI.ObjectPropertiesSection.ObjectPropertyTreeElement) {
      if (target.property && target.property.value &&
          LinearMemoryInspector.LinearMemoryInspectorController.isMemoryObjectProperty(target.property.value)) {
        contextMenu.debugSection().appendItem(
            i18nString(UIStrings.revealInMemoryInspectorPanel),
            this.openMemoryInspector.bind(this, target.property.value));
      }
    }
  }

  private async openMemoryInspector(obj: SDK.RemoteObject.RemoteObject): Promise<void> {
    const controller = LinearMemoryInspector.LinearMemoryInspectorController.LinearMemoryInspectorController.instance();
    Host.userMetrics.linearMemoryInspectorRevealedFrom(Host.UserMetrics.LinearMemoryInspectorRevealedFrom.ContextMenu);
    void controller.openInspectorView(obj);
  }
}