import {AbsQuickLook} from 'scriptable-abstract';

import {MockData} from '../data';
import {MockImage} from '../media/image';

interface QuickLookState {
  lastPreviewedItem: string | Image | Data | null;
}

/**
 * Mock implementation of Scriptable's QuickLook global variable
 * Provides functionality for previewing various types of content
 *
 * @implements QuickLook
 */
export class MockQuickLook extends AbsQuickLook<QuickLookState> {
  static get instance(): MockQuickLook {
    return super.instance as MockQuickLook;
  }

  constructor() {
    super({
      lastPreviewedItem: null,
    });
  }

  /**
   * @inheritdoc
   */
  async present(item: string | Image | Data): Promise<void> {
    // Validate input
    if (item instanceof MockImage || item instanceof MockData || typeof item === 'string') {
      this.setState({lastPreviewedItem: item});
    } else {
      throw new Error('Invalid item type for QuickLook preview');
    }
  }

  /**
   * @additional
   * Get the last previewed item
   */
  getLastPreviewedItem(): string | Image | Data | null {
    return this.state.lastPreviewedItem;
  }

  /**
   * @additional
   * Clear the preview history
   */
  clear(): void {
    this.setState({lastPreviewedItem: null});
  }
}