import { Page, Locator, PageScreenshotOptions } from '@playwright/test';
import { testLogger } from '../shared/utils/test-logger';
import * as path from 'path';
import * as fs from 'fs';

export interface ScreenshotConfig {
  outputDir: string;
  filename: string;
  fullPage: boolean;
  quality?: number;
  type: 'png' | 'jpeg';
  timeout: number;
}

export interface ScreenshotMetadata {
  filename: string;
  path: string;
  timestamp: string;
  testName?: string;
  description?: string;
}

export class ScreenshotHelper {
  private page: Page;
  private outputDir: string;
  private defaultConfig: Partial<ScreenshotConfig>;
  private screenshots: Map<string, ScreenshotMetadata> = new Map();

  constructor(page: Page, outputDir: string = 'test-results/screenshots') {
    this.page = page;
    this.outputDir = outputDir;
    this.defaultConfig = {
      outputDir,
      fullPage: false,
      type: 'png',
      timeout: 5000
    };
    this.ensureOutputDir();
    testLogger.info(`ScreenshotHelper initialized with output dir: ${outputDir}`);
  }

  setDefaultConfig(config: Partial<ScreenshotConfig>): void {
    this.defaultConfig = { ...this.defaultConfig, ...config };
    testLogger.debug('Default screenshot config updated');
  }

  async capture(config: Partial<ScreenshotConfig> = {}): Promise<string> {
    const finalConfig = { ...this.defaultConfig, ...config };
    const filename = this.generateFilename(finalConfig.filename);
    const filePath = path.join(finalConfig.outputDir || this.outputDir, filename);

    testLogger.info(`Capturing screenshot: ${filename}`);

    const options: PageScreenshotOptions = {
      path: filePath,
      type: finalConfig.type,
      fullPage: finalConfig.fullPage,
      timeout: finalConfig.timeout
    };

    if (finalConfig.quality && finalConfig.type === 'jpeg') {
      options.quality = finalConfig.quality;
    }

    await this.page.screenshot(options);

    const metadata: ScreenshotMetadata = {
      filename,
      path: filePath,
      timestamp: new Date().toISOString()
    };

    this.screenshots.set(filename, metadata);

    testLogger.info(`Screenshot captured: ${filePath}`);
    return filePath;
  }

  async captureElement(locator: Locator, config: Partial<ScreenshotConfig> = {}): Promise<string> {
    const finalConfig = { ...this.defaultConfig, ...config };
    const filename = this.generateFilename(finalConfig.filename);
    const filePath = path.join(finalConfig.outputDir || this.outputDir, filename);

    testLogger.info(`Capturing element screenshot: ${filename}`);

    const options: PageScreenshotOptions = {
      path: filePath,
      type: finalConfig.type,
      timeout: finalConfig.timeout
    };

    if (finalConfig.quality && finalConfig.type === 'jpeg') {
      options.quality = finalConfig.quality;
    }

    await locator.screenshot(options);

    const metadata: ScreenshotMetadata = {
      filename,
      path: filePath,
      timestamp: new Date().toISOString()
    };

    this.screenshots.set(filename, metadata);

    testLogger.info(`Element screenshot captured: ${filePath}`);
    return filePath;
  }

  async captureFullPage(config: Partial<ScreenshotConfig> = {}): Promise<string> {
    return this.capture({ ...config, fullPage: true });
  }

  async captureViewport(config: Partial<ScreenshotConfig> = {}): Promise<string> {
    return this.capture({ ...config, fullPage: false });
  }

  async captureOnFailure(testName: string, error?: Error): Promise<string> {
    const filename = `failure-${testName}-${Date.now()}`;
    const filePath = await this.captureFullPage({ filename });

    testLogger.error(`Screenshot captured on failure: ${testName}`, error);

    if (error) {
      const errorLogPath = path.join(this.outputDir, `failure-${testName}-${Date.now()}.log`);
      const errorLog = `
Test Name: ${testName}
Timestamp: ${new Date().toISOString()}
Error: ${error.message}
Stack Trace:
${error.stack}
      `.trim();

      fs.writeFileSync(errorLogPath, errorLog);
      testLogger.info(`Error log saved: ${errorLogPath}`);
    }

    return filePath;
  }

  async captureWithDescription(description: string, config: Partial<ScreenshotConfig> = {}): Promise<string> {
    const filename = `${description}-${Date.now()}`;
    const filePath = await this.capture({ ...config, filename });

    const metadata = this.screenshots.get(filename);
    if (metadata) {
      metadata.description = description;
      this.screenshots.set(filename, metadata);
    }

    return filePath;
  }

  async captureBeforeAction(actionName: string, config: Partial<ScreenshotConfig> = {}): Promise<string> {
    const filename = `before-${actionName}-${Date.now()}`;
    return this.capture({ ...config, filename });
  }

  async captureAfterAction(actionName: string, config: Partial<ScreenshotConfig> = {}): Promise<string> {
    const filename = `after-${actionName}-${Date.now()}`;
    return this.capture({ ...config, filename });
  }

  async captureStep(stepName: string, config: Partial<ScreenshotConfig> = {}): Promise<string> {
    const filename = `step-${stepName}-${Date.now()}`;
    return this.capture({ ...config, filename });
  }

  async captureMultiple(configs: Partial<ScreenshotConfig>[]): Promise<string[]> {
    testLogger.info(`Capturing ${configs.length} screenshots`);

    const filePaths: string[] = [];

    for (let i = 0; i < configs.length; i++) {
      const filePath = await this.capture(configs[i]);
      filePaths.push(filePath);
    }

    testLogger.info(`Captured ${filePaths.length} screenshots`);
    return filePaths;
  }

  async captureWithDelay(delay: number, config: Partial<ScreenshotConfig> = {}): Promise<string> {
    testLogger.info(`Waiting ${delay}ms before capturing screenshot`);

    await this.page.waitForTimeout(delay);

    return this.capture(config);
  }

  async captureOnHover(locator: Locator, config: Partial<ScreenshotConfig> = {}): Promise<string> {
    testLogger.info('Capturing screenshot on hover');

    await locator.hover();
    await this.page.waitForTimeout(300);

    return this.capture(config);
  }

  async captureOnFocus(locator: Locator, config: Partial<ScreenshotConfig> = {}): Promise<string> {
    testLogger.info('Capturing screenshot on focus');

    await locator.focus();
    await this.page.waitForTimeout(300);

    return this.capture(config);
  }

  async captureVisibleArea(config: Partial<ScreenshotConfig> = {}): Promise<string> {
    testLogger.info('Capturing visible area screenshot');

    const viewportSize = this.page.viewportSize();
    if (viewportSize) {
      const clip = {
        x: 0,
        y: 0,
        width: viewportSize.width,
        height: viewportSize.height
      };

      const finalConfig = { ...this.defaultConfig, ...config };
      const filename = this.generateFilename(finalConfig.filename);
      const filePath = path.join(finalConfig.outputDir || this.outputDir, filename);

      const options: PageScreenshotOptions = {
        path: filePath,
        type: finalConfig.type,
        clip,
        timeout: finalConfig.timeout
      };

      if (finalConfig.quality && finalConfig.type === 'jpeg') {
        options.quality = finalConfig.quality;
      }

      await this.page.screenshot(options);

      const metadata: ScreenshotMetadata = {
        filename,
        path: filePath,
        timestamp: new Date().toISOString()
      };

      this.screenshots.set(filename, metadata);

      testLogger.info(`Visible area screenshot captured: ${filePath}`);
      return filePath;
    }

    return this.captureViewport(config);
  }

  async captureElementBounds(locator: Locator, config: Partial<ScreenshotConfig> = {}): Promise<string> {
    testLogger.info('Capturing element bounds screenshot');

    const box = await locator.boundingBox();
    if (box) {
      const finalConfig = { ...this.defaultConfig, ...config };
      const filename = this.generateFilename(finalConfig.filename);
      const filePath = path.join(finalConfig.outputDir || this.outputDir, filename);

      const options: PageScreenshotOptions = {
        path: filePath,
        type: finalConfig.type,
        clip: box,
        timeout: finalConfig.timeout
      };

      if (finalConfig.quality && finalConfig.type === 'jpeg') {
        options.quality = finalConfig.quality;
      }

      await this.page.screenshot(options);

      const metadata: ScreenshotMetadata = {
        filename,
        path: filePath,
        timestamp: new Date().toISOString()
      };

      this.screenshots.set(filename, metadata);

      testLogger.info(`Element bounds screenshot captured: ${filePath}`);
      return filePath;
    }

    return this.captureElement(locator, config);
  }

  getScreenshotPath(filename: string): string | undefined {
    const metadata = this.screenshots.get(filename);
    return metadata?.path;
  }

  getAllScreenshots(): ScreenshotMetadata[] {
    return Array.from(this.screenshots.values());
  }

  getScreenshotCount(): number {
    return this.screenshots.size;
  }

  clearScreenshots(): void {
    this.screenshots.clear();
    testLogger.info('Screenshots cleared');
  }

  deleteScreenshot(filename: string): boolean {
    const metadata = this.screenshots.get(filename);
    
    if (metadata && fs.existsSync(metadata.path)) {
      fs.unlinkSync(metadata.path);
      this.screenshots.delete(filename);
      testLogger.info(`Screenshot deleted: ${filename}`);
      return true;
    }

    return false;
  }

  deleteAllScreenshots(): void {
    const screenshotValues = Array.from(this.screenshots.values());
    for (const metadata of screenshotValues) {
      if (fs.existsSync(metadata.path)) {
        fs.unlinkSync(metadata.path);
      }
    }

    this.screenshots.clear();
    testLogger.info('All screenshots deleted');
  }

  async compareScreenshots(beforePath: string, afterPath: string): Promise<boolean> {
    testLogger.info(`Comparing screenshots: ${beforePath} vs ${afterPath}`);

    const beforeExists = fs.existsSync(beforePath);
    const afterExists = fs.existsSync(afterPath);

    if (!beforeExists || !afterExists) {
      testLogger.warn('Screenshot comparison failed: files not found');
      return false;
    }

    const beforeStats = fs.statSync(beforePath);
    const afterStats = fs.statSync(afterPath);

    const areEqual = beforeStats.size === afterStats.size;

    testLogger.info(`Screenshot comparison result: ${areEqual}`);
    return areEqual;
  }

  async createScreenshotReport(): Promise<string> {
    testLogger.info('Creating screenshot report');

    const reportPath = path.join(this.outputDir, 'screenshot-report.md');
    const screenshots = this.getAllScreenshots();

    let report = '# Screenshot Report\n\n';
    report += `Generated at: ${new Date().toISOString()}\n`;
    report += `Total screenshots: ${screenshots.length}\n\n`;
    report += '## Screenshots\n\n';

    for (const screenshot of screenshots) {
      report += `### ${screenshot.filename}\n`;
      report += `- **Path**: ${screenshot.path}\n`;
      report += `- **Timestamp**: ${screenshot.timestamp}\n`;
      if (screenshot.description) {
        report += `- **Description**: ${screenshot.description}\n`;
      }
      report += '\n';
    }

    fs.writeFileSync(reportPath, report);
    testLogger.info(`Screenshot report created: ${reportPath}`);

    return reportPath;
  }

  private generateFilename(filename?: string): string {
    if (filename) {
      return `${filename}.${this.defaultConfig.type || 'png'}`;
    }
    return `screenshot-${Date.now()}.${this.defaultConfig.type || 'png'}`;
  }

  private ensureOutputDir(): void {
    if (!fs.existsSync(this.outputDir)) {
      fs.mkdirSync(this.outputDir, { recursive: true });
      testLogger.info(`Output directory created: ${this.outputDir}`);
    }
  }
}