import {
  inject,
  injectable,
  postConstruct,
} from '@theia/core/shared/inversify';
import { toArray } from '@theia/core/shared/@phosphor/algorithm';
import { IDragEvent } from '@theia/core/shared/@phosphor/dragdrop';
import { DockPanel, Widget } from '@theia/core/shared/@phosphor/widgets';
import { Message, MessageLoop } from '@theia/core/shared/@phosphor/messaging';
import { Disposable } from '@theia/core/lib/common/disposable';
import { BaseWidget } from '@theia/core/lib/browser/widgets/widget';
import { SketchbookTreeWidget } from './sketchbook-tree-widget';
import { nls } from '@theia/core/lib/common';
import { URI } from '../../contributions/contribution';
import {
  BaseSketchbookCompositeWidget,
  SketchbookCompositeWidget,
} from './sketchbook-composite-widget';

@injectable()
export class SketchbookWidget extends BaseWidget {
  static readonly LABEL = nls.localize(
    'arduino/sketch/titleSketchbook',
    'Sketchbook'
  );

  @inject(SketchbookCompositeWidget)
  protected readonly sketchbookCompositeWidget: SketchbookCompositeWidget;

  protected readonly sketchbookTreesContainer: DockPanel;

  constructor() {
    super();
    this.id = 'arduino-sketchbook-widget';
    this.title.caption = SketchbookWidget.LABEL;
    this.title.label = SketchbookWidget.LABEL;
    this.title.iconClass = 'fa fa-arduino-folder';
    this.title.closable = true;
    this.node.tabIndex = 0;
    this.sketchbookTreesContainer = this.createTreesContainer();
  }

  @postConstruct()
  protected init(): void {
    this.sketchbookTreesContainer.addWidget(this.sketchbookCompositeWidget);
  }

  protected override onAfterAttach(message: Message): void {
    super.onAfterAttach(message);
    Widget.attach(this.sketchbookTreesContainer, this.node);
    this.toDisposeOnDetach.push(
      Disposable.create(() => Widget.detach(this.sketchbookTreesContainer))
    );
  }

  /**
   * The currently selected sketchbook tree widget inside the view.
   */
  getTreeWidget(): SketchbookTreeWidget {
    return this.sketchbookCompositeWidget.treeWidget;
  }

  /**
   * An array of all sketchbook tree widgets managed by the view.
   */
  getTreeWidgets(): SketchbookTreeWidget[] {
    return toArray(this.sketchbookTreesContainer.widgets()).reduce(
      (acc, curr) => {
        if (curr instanceof BaseSketchbookCompositeWidget) {
          acc.push(curr.treeWidget);
        }
        return acc;
      },
      [] as SketchbookTreeWidget[]
    );
  }

  activeTreeWidgetId(): string | undefined {
    const selectedTreeWidgets = toArray(
      this.sketchbookTreesContainer.selectedWidgets()
    ).map(({ id }) => id);
    if (selectedTreeWidgets.length > 1) {
      console.warn(
        `Found multiple selected tree widgets: ${JSON.stringify(
          selectedTreeWidgets
        )}. Expected only one.`
      );
    }
    return selectedTreeWidgets.shift();
  }

  async revealSketchNode(treeWidgetId: string, nodeUri: string): Promise<void> {
    const widget = toArray(this.sketchbookTreesContainer.widgets())
      .filter(({ id }) => id === treeWidgetId)
      .shift();
    if (!widget) {
      console.warn(`Could not find tree widget with ID: ${widget}`);
      return;
    }
    // TODO: remove this when the remote/local sketchbooks and their widgets are cleaned up.
    const findTreeWidget = (
      widget: Widget | undefined
    ): SketchbookTreeWidget | undefined => {
      if (widget instanceof SketchbookTreeWidget) {
        return widget;
      }
      if (widget instanceof BaseSketchbookCompositeWidget) {
        return widget.treeWidget;
      }
      return undefined;
    };
    const treeWidget = findTreeWidget(
      toArray(this.sketchbookTreesContainer.widgets())
        .filter(({ id }) => id === treeWidgetId)
        .shift()
    );
    if (!treeWidget) {
      console.warn(`Could not find tree widget with ID: ${treeWidget}`);
      return;
    }
    this.sketchbookTreesContainer.activateWidget(widget);

    const treeNode = await treeWidget.model.revealFile(new URI(nodeUri));
    if (!treeNode) {
      console.warn(`Could not find tree node with URI: ${nodeUri}`);
    }
  }

  protected override onActivateRequest(message: Message): void {
    super.onActivateRequest(message);

    // TODO: focus the active sketchbook
    // if (this.editor) {
    //     this.editor.focus();
    // } else {
    // }
    this.node.focus();
  }

  protected override onResize(message: Widget.ResizeMessage): void {
    super.onResize(message);
    MessageLoop.sendMessage(
      this.sketchbookTreesContainer,
      Widget.ResizeMessage.UnknownSize
    );
    for (const widget of toArray(this.sketchbookTreesContainer.widgets())) {
      MessageLoop.sendMessage(widget, Widget.ResizeMessage.UnknownSize);
    }
  }

  protected override onAfterShow(msg: Message): void {
    super.onAfterShow(msg);
    this.onResize(Widget.ResizeMessage.UnknownSize);
  }

  protected createTreesContainer(): DockPanel {
    const panel = new NoopDragOverDockPanel({
      spacing: 0,
      mode: 'single-document',
    });
    panel.addClass('sketchbook-trees-container');
    panel.node.tabIndex = -1;
    return panel;
  }
}

export class NoopDragOverDockPanel extends DockPanel {
  constructor(options?: DockPanel.IOptions) {
    super(options);
    NoopDragOverDockPanel.prototype['_evtDragOver'] = (event: IDragEvent) => {
      event.preventDefault();
      event.stopPropagation();
      event.dropAction = 'none';
    };
  }
}