import { Page } from 'playwright';
import { Logger } from 'winston';
import * as fs from 'fs';
import * as path from 'path';
import * as os from 'os';

/**
 * BackgroundProcedure - Handles setting a virtual background in Teams pre-join screen.
 * 
 * Must be called AFTER the bot is on the pre-join screen but BEFORE clicking "Join now".
 * Only works for authenticated joins (anonymous guests may not have background options).
 */
export class BackgroundProcedure {
  private _page: Page;
  private _logger: Logger;

  constructor(page: Page, logger: Logger) {
    this._page = page;
    this._logger = logger;
  }

  /**
   * Set a virtual background from a URL on the Teams pre-join screen.
   * 
   * @param imageUrl - URL of the background image to download and apply
   * @returns true if background was set successfully
   */
  async setBackgroundFromUrl(imageUrl: string): Promise<boolean> {
    try {
      this._logger.info(`Setting virtual background from: ${imageUrl}`);

      // Download the image to a temp file
      const tempDir = os.tmpdir();
      const tempFile = path.join(tempDir, `poweron-bg-${Date.now()}.jpg`);

      const response = await fetch(imageUrl);
      if (!response.ok) {
        this._logger.error(`Failed to download background image: ${response.status} ${response.statusText}`);
        return false;
      }

      const buffer = Buffer.from(await response.arrayBuffer());
      fs.writeFileSync(tempFile, buffer);
      this._logger.info(`Background image downloaded: ${buffer.length} bytes -> ${tempFile}`);

      // Open background effects panel
      const panelOpened = await this._openBackgroundEffectsPanel();
      if (!panelOpened) {
        this._logger.warn('Could not open background effects panel - skipping background');
        this._cleanup(tempFile);
        return false;
      }

      // Upload the image
      const uploaded = await this._uploadBackgroundImage(tempFile);
      this._cleanup(tempFile);

      if (uploaded) {
        this._logger.info('Virtual background set successfully');
      } else {
        this._logger.warn('Could not upload background image');
      }

      return uploaded;

    } catch (error) {
      this._logger.error(`Background setup failed: ${error}`);
      return false;
    }
  }

  /**
   * Open the background effects panel on the pre-join screen.
   */
  private async _openBackgroundEffectsPanel(): Promise<boolean> {
    const backgroundButtonSelectors = [
      'button[data-tid="toggle-background-effect"]',
      'button[aria-label*="Background" i]',
      'button[aria-label*="Hintergrund" i]',
      'button[aria-label*="background filters" i]',
      'button[aria-label*="Hintergrundeffekte" i]',
      '#video-background-effects-button',
    ];

    for (const selector of backgroundButtonSelectors) {
      try {
        const button = await this._page.$(selector);
        if (button) {
          await button.click();
          this._logger.info(`Clicked background effects button: ${selector}`);
          await this._page.waitForTimeout(2000);
          return true;
        }
      } catch {
        // Continue trying
      }
    }

    this._logger.warn('Background effects button not found');
    return false;
  }

  /**
   * Upload a background image via the file input in the background effects panel.
   */
  private async _uploadBackgroundImage(filePath: string): Promise<boolean> {
    try {
      // Look for "Add new" or "+" button to upload custom image
      const addButtonSelectors = [
        'button[aria-label*="Add new" i]',
        'button[aria-label*="Neu hinzufügen" i]',
        'button[aria-label*="add image" i]',
        'button[aria-label*="Bild hinzufügen" i]',
        'button[data-tid="add-background-image"]',
        '.add-image-button',
      ];

      let addButtonClicked = false;
      for (const selector of addButtonSelectors) {
        try {
          const button = await this._page.$(selector);
          if (button) {
            await button.click();
            this._logger.info(`Clicked add image button: ${selector}`);
            addButtonClicked = true;
            await this._page.waitForTimeout(1000);
            break;
          }
        } catch {
          // Continue
        }
      }

      // Try to find file input (may appear after clicking add, or may already exist)
      const fileInput = await this._page.$('input[type="file"]');
      if (fileInput) {
        await fileInput.setInputFiles(filePath);
        this._logger.info('Background image uploaded via file input');
        await this._page.waitForTimeout(2000);

        // The uploaded image should be auto-selected, but click it to be sure
        // Look for the last image in the background gallery (newly uploaded)
        try {
          const images = await this._page.$$('[data-tid="background-image"], .background-image-item');
          if (images.length > 0) {
            const lastImage = images[images.length - 1];
            await lastImage.click();
            this._logger.info('Selected uploaded background image');
            await this._page.waitForTimeout(1000);
          }
        } catch {
          this._logger.debug('Could not click uploaded image - may be auto-selected');
        }

        return true;
      }

      if (!addButtonClicked) {
        this._logger.warn('No add-image button or file input found');
      }

      return false;

    } catch (error) {
      this._logger.error(`Background image upload failed: ${error}`);
      return false;
    }
  }

  /**
   * Clean up temp file.
   */
  private _cleanup(filePath: string): void {
    try {
      if (fs.existsSync(filePath)) {
        fs.unlinkSync(filePath);
      }
    } catch {
      // Ignore cleanup errors
    }
  }
}