import { Page } from '@playwright/test';

export interface CoreWebVitals {
  FCP: number;
  LCP: number;
  CLS: number;
  FID: number;
  TTI: number;
}

export interface LighthouseResult {
  score: number;
  audits: Record<string, any>;
}

export class MobilePerformanceMonitor {
  constructor(private page: Page) {}
  
  async getCoreWebVitals(): Promise<CoreWebVitals> {
    const vitals = await this.page.evaluate(() => {
      return new Promise((resolve) => {
        const metrics: any = {};
        
        const observer = new PerformanceObserver((list) => {
          for (const entry of list.getEntries()) {
            if (entry.entryType === 'paint') {
              if (entry.name === 'first-contentful-paint') {
                metrics.FCP = entry.startTime;
              }
            } else if (entry.entryType === 'largest-contentful-paint') {
              metrics.LCP = entry.startTime;
            } else if (entry.entryType === 'layout-shift') {
              if (!metrics.CLS) metrics.CLS = 0;
              metrics.CLS += (entry as any).value;
            }
          }
        });
        
        observer.observe({ entryTypes: ['paint', 'largest-contentful-paint', 'layout-shift'] });
        
        setTimeout(() => {
          observer.disconnect();
          resolve(metrics);
        }, 5000);
      });
    });
    
    return {
      FCP: vitals.FCP || 0,
      LCP: vitals.LCP || 0,
      CLS: vitals.CLS || 0,
      FID: 0,
      TTI: 0,
    };
  }
}