#!/usr/bin/env node
'use strict';

const BASE_URL = process.env.BENCHMARK_URL || 'http://localhost:3001';
const ITERATIONS = 5;
const MEAN_THRESHOLD_MS = parseInt(process.env.SLOW_THRESHOLD_MS || '500', 10);

const ENDPOINTS = [
  { label: 'GET /api/paychecks', path: `/api/paychecks?year=${new Date().getFullYear()}&month=${new Date().getMonth() + 1}` },
  { label: 'GET /api/financing', path: '/api/financing' },
  { label: 'GET /api/summary/annual', path: `/api/summary/annual?year=${new Date().getFullYear()}` },
];

async function measureEndpoint(endpoint) {
  const times = [];
  for (let i = 0; i < ITERATIONS; i++) {
    const start = Date.now();
    const res = await fetch(`${BASE_URL}${endpoint.path}`);
    const duration = Date.now() - start;
    if (!res.ok) {
      console.warn(`  [warn] ${endpoint.label} returned HTTP ${res.status}`);
    }
    times.push(duration);
  }
  const min = Math.min(...times);
  const max = Math.max(...times);
  const mean = Math.round(times.reduce((a, b) => a + b, 0) / times.length);
  return { min, mean, max };
}

(async () => {
  console.log(`Benchmarking ${BASE_URL} (${ITERATIONS} iterations each, threshold ${MEAN_THRESHOLD_MS}ms)\n`);

  let failed = false;

  for (const endpoint of ENDPOINTS) {
    let stats;
    try {
      stats = await measureEndpoint(endpoint);
    } catch (err) {
      console.error(`  [error] ${endpoint.label}: ${err.message}`);
      failed = true;
      continue;
    }

    const flag = stats.mean >= MEAN_THRESHOLD_MS ? ' *** SLOW ***' : '';
    console.log(`${endpoint.label}`);
    console.log(`  min=${stats.min}ms  mean=${stats.mean}ms  max=${stats.max}ms${flag}`);

    if (stats.mean >= MEAN_THRESHOLD_MS) {
      failed = true;
    }
  }

  console.log('');
  if (failed) {
    console.error('FAIL: one or more endpoints exceeded the threshold or errored.');
    process.exit(1);
  } else {
    console.log('PASS: all endpoints within threshold.');
  }
})();