function estimateMonthlyCost(config: {
  product: 'residential' | 'web_unlocker' | 'scraping_browser' | 'serp_api';
  requestsPerMonth: number;
  avgPageSizeKB?: number;
}) {
  switch (config.product) {
    case 'residential':
      const gbTransferred = (config.requestsPerMonth * (config.avgPageSizeKB || 200)) / 1_000_000;
      return { cost: gbTransferred * 10, unit: 'GB', quantity: gbTransferred };
    case 'web_unlocker':
      return { cost: config.requestsPerMonth * 0.002, unit: 'requests', quantity: config.requestsPerMonth };
    case 'scraping_browser':
      return { cost: config.requestsPerMonth * 0.008, unit: 'sessions', quantity: config.requestsPerMonth };
    case 'serp_api':
      return { cost: config.requestsPerMonth * 0.003, unit: 'searches', quantity: config.requestsPerMonth };
  }
}

// Example: 50,000 product pages/month
console.log(estimateMonthlyCost({ product: 'web_unlocker', requestsPerMonth: 50000 }));
// { cost: 100, unit: 'requests', quantity: 50000 }
console.log(estimateMonthlyCost({ product: 'residential', requestsPerMonth: 50000, avgPageSizeKB: 300 }));
// { cost: 150, unit: 'GB', quantity: 15 }

// Response caching is the single biggest cost saver
// Cache policy by data freshness requirements
const CACHE_TTLS = {
  product_price: 3600000,     // 1 hour — prices change frequently
  product_details: 86400000,  // 24 hours — descriptions rarely change
  search_results: 1800000,    // 30 minutes — SERPs change often
  static_page: 604800000,     // 7 days — about/contact pages
};

// Track cache savings
let cacheSavings = 0;
function trackCacheHit(product: string) {
  const costPerRequest = { web_unlocker: 0.002, scraping_browser: 0.008, serp_api: 0.003 };
  cacheSavings += costPerRequest[product] || 0.002;
  console.log(`Cache savings this session: $${cacheSavings.toFixed(4)}`);
}

// Individual requests: 50,000 requests * $0.002 = $100
// Web Scraper API: 1 trigger with 50,000 URLs = typically cheaper (volume discounts)

async function bulkScrapeForCost(urls: string[]) {
  // Batch into single trigger — one API call, lower cost
  const response = await fetch(
    `https://api.brightdata.com/datasets/v3/trigger?dataset_id=${DATASET_ID}&format=json`,
    {
      method: 'POST',
      headers: {
        'Authorization': `Bearer ${process.env.BRIGHTDATA_API_TOKEN}`,
        'Content-Type': 'application/json',
      },
      body: JSON.stringify(urls.map(url => ({ url }))),
    }
  );
  return response.json();
}

class BrightDataUsageTracker {
  private dailyRequests = 0;
  private dailyCost = 0;
  private readonly budgetAlert: number;

  constructor(dailyBudgetUSD: number) {
    this.budgetAlert = dailyBudgetUSD * 0.8;
  }

  track(product: string) {
    this.dailyRequests++;
    const costs = { web_unlocker: 0.002, scraping_browser: 0.008, serp_api: 0.003, residential: 0.0001 };
    this.dailyCost += costs[product] || 0.002;

    if (this.dailyCost > this.budgetAlert) {
      console.warn(`BUDGET ALERT: Daily cost $${this.dailyCost.toFixed(2)} exceeds 80% of budget`);
    }
  }

  report() {
    return {
      requests: this.dailyRequests,
      estimatedCost: `$${this.dailyCost.toFixed(2)}`,
      projectedMonthly: `$${(this.dailyCost * 30).toFixed(2)}`,
    };
  }
}