class GrammarlyMetrics {
  private calls = { score: 0, ai: 0, plagiarism: 0 };
  private errors = 0;
  private latencies: number[] = [];

  recordCall(api: 'score' | 'ai' | 'plagiarism', latencyMs: number) {
    this.calls[api]++;
    this.latencies.push(latencyMs);
  }

  recordError() { this.errors++; }

  report() {
    const sorted = [...this.latencies].sort((a, b) => a - b);
    return {
      totalCalls: Object.values(this.calls).reduce((a, b) => a + b, 0),
      callsByAPI: this.calls,
      errors: this.errors,
      p50: sorted[Math.floor(sorted.length * 0.5)] || 0,
      p95: sorted[Math.floor(sorted.length * 0.95)] || 0,
    };
  }
}

function logGrammarlyCall(api: string, duration: number, status: number, textLength: number) {
  console.log(JSON.stringify({
    service: 'grammarly',
    api,
    duration_ms: duration,
    status,
    text_length: textLength,
    timestamp: new Date().toISOString(),
  }));
}

// Alert on error rate > 10%
const errorRate = metrics.errors / (metrics.totalCalls || 1);
if (errorRate > 0.1) {
  console.error(`ALERT: Grammarly error rate ${(errorRate * 100).toFixed(1)}%`);
}