#!/usr/bin/env node

/**
 * Monitor authentication health after deployment
 * Run this after activating enhanced auth to watch for issues
 */

const { db } = require('../src/database/db');

console.log('=== Authentication Health Monitor ===\n');
console.log('Monitoring auth system... (Press Ctrl+C to stop)\n');

// Color codes
const GREEN = '\x1b[32m';
const RED = '\x1b[31m';
const YELLOW = '\x1b[33m';
const RESET = '\x1b[0m';

let previousStats = {
  totalAttempts: 0,
  failedAttempts: 0,
  lockedAccounts: 0
};

async function getAuthStats() {
  try {
    const stats = {};
    
    // Total login attempts in last hour
    const totalAttempts = await db('login_attempts')
      .where('attempt_time', '>', new Date(Date.now() - 60 * 60 * 1000).toISOString())
      .count('id as count')
      .first();
    stats.totalAttempts = totalAttempts.count || 0;
    
    // Failed attempts in last hour
    const failedAttempts = await db('login_attempts')
      .where('attempt_time', '>', new Date(Date.now() - 60 * 60 * 1000).toISOString())
      .where('success', false)
      .count('id as count')
      .first();
    stats.failedAttempts = failedAttempts.count || 0;
    
    // Currently locked accounts
    const recentWindow = new Date(Date.now() - 15 * 60 * 1000);
    const lockedAccounts = await db('login_attempts')
      .select('identifier')
      .where('success', false)
      .where('attempt_time', '>=', recentWindow.toISOString())
      .groupBy('identifier')
      .havingRaw('COUNT(*) >= 5');
    stats.lockedAccounts = lockedAccounts.length;
    
    // Success rate
    stats.successRate = stats.totalAttempts > 0 
      ? ((stats.totalAttempts - stats.failedAttempts) / stats.totalAttempts * 100).toFixed(1)
      : 100;
    
    // Recent failures (last 5 minutes)
    const recentFailures = await db('login_attempts')
      .where('success', false)
      .where('attempt_time', '>', new Date(Date.now() - 5 * 60 * 1000).toISOString())
      .orderBy('attempt_time', 'desc')
      .limit(5)
      .select('identifier', 'ip_address', 'attempt_time');
    stats.recentFailures = recentFailures;
    
    return stats;
  } catch (error) {
    return { error: error.message };
  }
}

async function displayStats() {
  const stats = await getAuthStats();
  
  if (stats.error) {
    console.log(`${RED}Error: ${stats.error}${RESET}`);
    console.log('Enhanced auth might not be active yet.\n');
    return;
  }
  
  // Clear console for clean display
  console.clear();
  console.log('=== Authentication Health Monitor ===\n');
  console.log(new Date().toLocaleString());
  console.log('─'.repeat(50));
  
  // Display metrics
  console.log(`\n📊 Last Hour Statistics:`);
  console.log(`   Total Login Attempts: ${stats.totalAttempts}`);
  console.log(`   Failed Attempts: ${stats.failedAttempts}`);
  console.log(`   Success Rate: ${stats.successRate}%`);
  console.log(`   Currently Locked: ${stats.lockedAccounts} accounts`);
  
  // Alerts
  if (stats.failedAttempts > previousStats.failedAttempts + 10) {
    console.log(`\n${RED}⚠️  ALERT: Spike in failed login attempts!${RESET}`);
  }
  
  if (stats.lockedAccounts > 5) {
    console.log(`\n${YELLOW}⚠️  WARNING: Multiple accounts locked (${stats.lockedAccounts})${RESET}`);
  }
  
  if (stats.successRate < 50) {
    console.log(`\n${RED}⚠️  ALERT: Low success rate (${stats.successRate}%)${RESET}`);
  }
  
  // Recent failures
  if (stats.recentFailures && stats.recentFailures.length > 0) {
    console.log(`\n📋 Recent Failed Attempts (last 5 min):`);
    stats.recentFailures.forEach(failure => {
      const time = new Date(failure.attempt_time).toLocaleTimeString();
      console.log(`   ${time} - ${failure.identifier} from ${failure.ip_address}`);
    });
  }
  
  // Health status
  console.log(`\n✅ Status: ${stats.failedAttempts === 0 ? 'Healthy' : 'Active'}`);
  console.log('\nPress Ctrl+C to stop monitoring\n');
  
  previousStats = stats;
}

// Monitor every 10 seconds
setInterval(displayStats, 10000);

// Initial display
displayStats();

// Graceful shutdown
process.on('SIGINT', async () => {
  console.log('\nStopping monitor...');
  await db.destroy();
  process.exit(0);
});