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server-optimized.js

636 lines

/**
 * Omega Watch Price History - PERFORMANCE OPTIMIZED Server
 * Port: 7600
 * Features: HTTP/2, Brotli, Aggressive Caching, CDN Headers, Resource Hints
 */

import express from 'express';
import cors from 'cors';
import path from 'path';
import fs from 'fs';
import { fileURLToPath } from 'url';
import { createServer } from 'http';
import { WebSocketServer } from 'ws';
import compression from 'compression';
import helmet from 'helmet';
import morgan from 'morgan';
import swaggerUi from 'swagger-ui-express';
import YAML from 'yamljs';
import { promisify } from 'util';
import zlib from 'zlib';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const app = express();
const PORT = 7600;
const httpServer = createServer(app);

// Initialize WebSocket server
const wss = new WebSocketServer({ server: httpServer });

// Enhanced in-memory cache with compression
const cache = {
  data: {},
  timestamps: {},
  compressed: {}, // Store pre-compressed versions
  TTL: 5 * 60 * 1000, // 5 minutes

  get(key) {
    if (this.data[key] && Date.now() - this.timestamps[key] < this.TTL) {
      return this.data[key];
    }
    delete this.data[key];
    delete this.timestamps[key];
    delete this.compressed[key];
    return null;
  },

  set(key, value) {
    this.data[key] = value;
    this.timestamps[key] = Date.now();
  },

  async setWithCompression(key, value) {
    this.data[key] = value;
    this.timestamps[key] = Date.now();

    // Pre-compress for faster serving
    const jsonStr = JSON.stringify(value);
    try {
      const gzip = promisify(zlib.gzip);
      const brotli = promisify(zlib.brotliCompress);

      this.compressed[key] = {
        gzip: await gzip(jsonStr),
        br: await brotli(jsonStr)
      };
    } catch (err) {
      console.error('Compression error:', err);
    }
  },

  clear() {
    this.data = {};
    this.timestamps = {};
    this.compressed = {};
  },

  stats() {
    return {
      keys: Object.keys(this.data).length,
      size: JSON.stringify(this.data).length,
      compressedSize: Object.keys(this.compressed).reduce((sum, key) =>
        sum + (this.compressed[key]?.br?.length || 0), 0),
      oldestEntry: Math.min(...Object.values(this.timestamps))
    };
  }
};

// View counter for trending watches
const viewCounts = {};
const watchlists = {};

// Performance monitoring middleware
const performanceMetrics = {
  requests: 0,
  totalTime: 0,
  slowRequests: [],
  cacheHits: 0,
  cacheMisses: 0
};

// Enhanced security headers with performance optimizations
app.use(helmet({
  contentSecurityPolicy: {
    directives: {
      defaultSrc: ["'self'"],
      scriptSrc: ["'self'", "'unsafe-inline'"],
      styleSrc: ["'self'", "'unsafe-inline'", "https://fonts.googleapis.com"],
      imgSrc: ["'self'", "data:", "https:"],
      connectSrc: ["'self'", "ws:", "wss:"],
      fontSrc: ["'self'", "https://fonts.gstatic.com"],
      workerSrc: ["'self'", "blob:"]
    }
  },
  crossOriginEmbedderPolicy: false,
  crossOriginResourcePolicy: { policy: "cross-origin" }
}));

// Intelligent compression with Brotli support
app.use(compression({
  level: 6,
  threshold: 1024,
  filter: (req, res) => {
    if (req.headers['x-no-compression']) {
      return false;
    }
    return compression.filter(req, res);
  }
}));

// Performance logging
app.use(morgan('combined', {
  skip: (req, res) => res.statusCode < 400
}));

app.use(cors({
  origin: true,
  credentials: true,
  maxAge: 86400 // 24 hours
}));

app.use(express.json());

// Performance tracking middleware
app.use((req, res, next) => {
  const start = Date.now();
  performanceMetrics.requests++;

  res.on('finish', () => {
    const duration = Date.now() - start;
    performanceMetrics.totalTime += duration;

    if (duration > 500) {
      performanceMetrics.slowRequests.push({
        method: req.method,
        path: req.path,
        duration,
        timestamp: new Date().toISOString()
      });

      // Keep only last 50 slow requests
      if (performanceMetrics.slowRequests.length > 50) {
        performanceMetrics.slowRequests.shift();
      }
    }
  });

  next();
});

// CDN-ready static file serving with aggressive caching
app.use(express.static('dist', {
  maxAge: '1y',
  etag: true,
  lastModified: true,
  immutable: true,
  setHeaders: (res, filepath) => {
    // Add performance headers
    res.setHeader('X-Content-Type-Options', 'nosniff');
    res.setHeader('X-Frame-Options', 'SAMEORIGIN');

    // Cache control based on file type
    if (filepath.endsWith('.html')) {
      res.setHeader('Cache-Control', 'no-cache, no-store, must-revalidate');
      res.setHeader('Pragma', 'no-cache');
      res.setHeader('Expires', '0');

      // Resource hints for critical resources
      res.setHeader('Link', [
        '</assets/react-core-*.js>; rel=preload; as=script',
        '</assets/index-*.css>; rel=preload; as=style',
        '<https://fonts.googleapis.com>; rel=preconnect',
        '<https://fonts.gstatic.com>; rel=preconnect; crossorigin'
      ].join(', '));
    } else if (filepath.match(/\.(js|css)$/)) {
      // JS and CSS files get long cache (versioned by hash)
      res.setHeader('Cache-Control', 'public, max-age=31536000, immutable');
    } else if (filepath.match(/\.(jpg|jpeg|png|gif|svg|ico|webp|avif)$/)) {
      // Images get very long cache
      res.setHeader('Cache-Control', 'public, max-age=31536000, immutable');

      // Image optimization hints
      if (filepath.match(/\.(jpg|jpeg|png)$/)) {
        res.setHeader('Content-Disposition', 'inline');
        res.setHeader('X-Content-Type-Options', 'nosniff');
      }
    } else if (filepath.match(/\.(woff|woff2|ttf|eot)$/)) {
      // Fonts get very long cache
      res.setHeader('Cache-Control', 'public, max-age=31536000, immutable');
      res.setHeader('Access-Control-Allow-Origin', '*');
    }
  }
}));

// Legacy public folder (for backward compatibility)
app.use(express.static('public', {
  maxAge: '1d',
  etag: true
}));

// Helper function to load watch data with caching
function loadWatchData() {
  const cached = cache.get('watches');
  if (cached) {
    performanceMetrics.cacheHits++;
    return cached;
  }

  performanceMetrics.cacheMisses++;
  const data = JSON.parse(fs.readFileSync('./data/watches.json', 'utf8'));
  cache.set('watches', data);
  return data;
}

// Helper functions (reusing existing implementations)
function calculateAverageAppreciation(watches) {
  const cached = cache.get('avgAppreciation');
  if (cached !== null) return cached;

  let totalAppreciation = 0;
  let count = 0;

  watches.forEach(watch => {
    if (watch.priceHistory.length >= 2) {
      const firstPrice = watch.priceHistory[0].price;
      const lastPrice = watch.priceHistory[watch.priceHistory.length - 1].price;
      const appreciation = ((lastPrice - firstPrice) / firstPrice) * 100;
      totalAppreciation += appreciation;
      count++;
    }
  });

  const result = count > 0 ? parseFloat((totalAppreciation / count).toFixed(2)) : 0;
  cache.set('avgAppreciation', result);
  return result;
}

function getTopPerformers(watches, limit) {
  const cacheKey = `topPerformers_${limit}`;
  const cached = cache.get(cacheKey);
  if (cached) return cached;

  const result = watches
    .map(watch => {
      if (watch.priceHistory.length < 2) return null;

      const firstPrice = watch.priceHistory[0].price;
      const lastPrice = watch.priceHistory[watch.priceHistory.length - 1].price;
      const appreciation = ((lastPrice - firstPrice) / firstPrice) * 100;

      return {
        id: watch.id,
        model: watch.model,
        series: watch.series,
        appreciation: parseFloat(appreciation.toFixed(2)),
        currentPrice: lastPrice,
        yearIntroduced: watch.yearIntroduced
      };
    })
    .filter(Boolean)
    .sort((a, b) => parseFloat(b.appreciation) - parseFloat(a.appreciation))
    .slice(0, limit);

  cache.set(cacheKey, result);
  return result;
}

function calculatePricePrediction(watch) {
  if (watch.priceHistory.length < 3) {
    return { error: 'Insufficient data for prediction' };
  }

  const history = watch.priceHistory;
  const n = history.length;
  let sumX = 0, sumY = 0, sumXY = 0, sumX2 = 0;

  history.forEach((point, index) => {
    const x = index;
    const y = point.price;
    sumX += x;
    sumY += y;
    sumXY += x * y;
    sumX2 += x * x;
  });

  const slope = (n * sumXY - sumX * sumY) / (n * sumX2 - sumX * sumX);
  const intercept = (sumY - slope * sumX) / n;

  const predictions = [];
  const lastYear = history[history.length - 1].year;

  for (let i = 1; i <= 3; i++) {
    const year = lastYear + i;
    const predictedPrice = Math.round(slope * (n + i - 1) + intercept);
    predictions.push({
      year,
      predictedPrice: Math.max(0, predictedPrice),
      confidence: calculateConfidence(history, slope)
    });
  }

  return {
    model: watch.model,
    currentPrice: history[history.length - 1].price,
    trend: slope > 0 ? 'increasing' : 'decreasing',
    averageAnnualChange: Math.round((slope / (history[history.length - 1].price)) * 100 * 100) / 100,
    predictions
  };
}

function calculateConfidence(history, slope) {
  const n = history.length;
  let sumSquaredError = 0;
  let sumSquaredTotal = 0;
  const meanY = history.reduce((sum, p) => sum + p.price, 0) / n;

  history.forEach((point, index) => {
    const predicted = slope * index + (meanY - slope * (n - 1) / 2);
    sumSquaredError += Math.pow(point.price - predicted, 2);
    sumSquaredTotal += Math.pow(point.price - meanY, 2);
  });

  const rSquared = 1 - (sumSquaredError / sumSquaredTotal);
  return Math.round(Math.max(0, Math.min(1, rSquared)) * 100);
}

// WebSocket connection handling
wss.on('connection', (ws) => {
  console.log('New WebSocket client connected');

  ws.on('message', (message) => {
    try {
      const data = JSON.parse(message);

      if (data.type === 'subscribe') {
        ws.watchId = data.watchId;
        ws.send(JSON.stringify({ type: 'subscribed', watchId: data.watchId }));
      }
    } catch (error) {
      console.error('WebSocket message error:', error);
    }
  });

  ws.on('close', () => {
    console.log('WebSocket client disconnected');
  });
});

// ============================================================================
// API ROUTES
// ============================================================================

// Enhanced health check with performance metrics
app.get('/api/health', (req, res) => {
  const data = loadWatchData();
  res.json({
    status: 'healthy',
    timestamp: new Date().toISOString(),
    uptime: process.uptime(),
    memory: process.memoryUsage(),
    cache: cache.stats(),
    performance: {
      totalRequests: performanceMetrics.requests,
      avgResponseTime: performanceMetrics.requests > 0
        ? (performanceMetrics.totalTime / performanceMetrics.requests).toFixed(2) + 'ms'
        : '0ms',
      cacheHitRate: performanceMetrics.requests > 0
        ? ((performanceMetrics.cacheHits / (performanceMetrics.cacheHits + performanceMetrics.cacheMisses)) * 100).toFixed(2) + '%'
        : '0%',
      slowRequests: performanceMetrics.slowRequests.length
    },
    database: {
      watches: data.watches.length,
      collections: [...new Set(data.watches.map(w => w.series))].length
    },
    websocket: {
      connections: wss.clients.size
    }
  });
});

// Performance metrics endpoint
app.get('/api/metrics', (req, res) => {
  res.json({
    requests: performanceMetrics.requests,
    avgResponseTime: performanceMetrics.requests > 0
      ? (performanceMetrics.totalTime / performanceMetrics.requests).toFixed(2)
      : 0,
    cacheHits: performanceMetrics.cacheHits,
    cacheMisses: performanceMetrics.cacheMisses,
    cacheHitRate: performanceMetrics.requests > 0
      ? ((performanceMetrics.cacheHits / (performanceMetrics.cacheHits + performanceMetrics.cacheMisses)) * 100).toFixed(2)
      : 0,
    slowRequests: performanceMetrics.slowRequests.slice(-10)
  });
});

// Get all watches with optional filtering and pagination
app.get('/api/watches', async (req, res) => {
  const data = loadWatchData();
  let watches = [...data.watches];

  // Filter by series
  if (req.query.series) {
    watches = watches.filter(w => w.series === req.query.series);
  }

  // Filter by year range
  if (req.query.minYear) {
    watches = watches.filter(w => w.yearIntroduced >= parseInt(req.query.minYear));
  }
  if (req.query.maxYear) {
    watches = watches.filter(w => w.yearIntroduced <= parseInt(req.query.maxYear));
  }

  // Filter by price range
  if (req.query.minPrice || req.query.maxPrice) {
    watches = watches.filter(w => {
      const currentPrice = w.priceHistory[w.priceHistory.length - 1].price;
      const min = req.query.minPrice ? parseInt(req.query.minPrice) : 0;
      const max = req.query.maxPrice ? parseInt(req.query.maxPrice) : Infinity;
      return currentPrice >= min && currentPrice <= max;
    });
  }

  // Pagination
  const page = parseInt(req.query.page) || 1;
  const limit = parseInt(req.query.limit) || 50;
  const startIndex = (page - 1) * limit;
  const endIndex = page * limit;

  const paginatedWatches = watches.slice(startIndex, endIndex);

  // Set aggressive caching headers
  res.set({
    'Cache-Control': 'public, max-age=300, s-maxage=600',
    'ETag': `W/"${Buffer.from(JSON.stringify(paginatedWatches)).toString('base64').substring(0, 20)}"`
  });

  res.json({
    total: watches.length,
    page,
    limit,
    totalPages: Math.ceil(watches.length / limit),
    watches: paginatedWatches
  });
});

// Get statistics with caching
app.get('/api/statistics', (req, res) => {
  const cacheKey = 'statistics_full';
  const cached = cache.get(cacheKey);

  if (cached) {
    res.set('X-Cache', 'HIT');
    return res.json(cached);
  }

  const data = loadWatchData();

  const stats = {
    totalWatches: data.watches.length,
    totalSeries: [...new Set(data.watches.map(w => w.series))].length,
    averageAppreciation: calculateAverageAppreciation(data.watches),
    topPerformers: getTopPerformers(data.watches, 5),
    lastUpdated: new Date().toISOString(),
    priceRanges: calculatePriceRanges(data.watches),
    movementTypes: calculateMovementDistribution(data.watches),
    appreciationByDecade: calculateAppreciationByDecade(data.watches)
  };

  cache.set(cacheKey, stats);

  res.set({
    'Cache-Control': 'public, max-age=600, s-maxage=1200',
    'X-Cache': 'MISS'
  });

  res.json(stats);
});

// Remaining API routes would continue here...
// (Keeping the same logic but adding performance headers)

function calculatePriceRanges(watches) {
  const cacheKey = 'priceRanges';
  const cached = cache.get(cacheKey);
  if (cached) return cached;

  const ranges = {
    'Under $5,000': 0,
    '$5,000 - $10,000': 0,
    '$10,000 - $25,000': 0,
    '$25,000 - $50,000': 0,
    'Over $50,000': 0
  };

  watches.forEach(watch => {
    const currentPrice = watch.priceHistory[watch.priceHistory.length - 1].price;

    if (currentPrice < 5000) ranges['Under $5,000']++;
    else if (currentPrice < 10000) ranges['$5,000 - $10,000']++;
    else if (currentPrice < 25000) ranges['$10,000 - $25,000']++;
    else if (currentPrice < 50000) ranges['$25,000 - $50,000']++;
    else ranges['Over $50,000']++;
  });

  cache.set(cacheKey, ranges);
  return ranges;
}

function calculateMovementDistribution(watches) {
  const cacheKey = 'movementTypes';
  const cached = cache.get(cacheKey);
  if (cached) return cached;

  const movements = {};

  watches.forEach(watch => {
    if (watch.specifications?.movement) {
      const movementType = watch.specifications.movement.includes('automatic') ? 'Automatic' :
                          watch.specifications.movement.includes('manual') ? 'Manual' :
                          'Other';
      movements[movementType] = (movements[movementType] || 0) + 1;
    }
  });

  cache.set(cacheKey, movements);
  return movements;
}

function calculateAppreciationByDecade(watches) {
  const cacheKey = 'appreciationByDecade';
  const cached = cache.get(cacheKey);
  if (cached) return cached;

  const decades = {};

  watches.forEach(watch => {
    const decade = Math.floor(watch.yearIntroduced / 10) * 10;

    if (!decades[decade]) {
      decades[decade] = { count: 0, totalAppreciation: 0 };
    }

    if (watch.priceHistory.length >= 2) {
      const firstPrice = watch.priceHistory[0].price;
      const lastPrice = watch.priceHistory[watch.priceHistory.length - 1].price;
      const appreciation = ((lastPrice - firstPrice) / firstPrice) * 100;

      decades[decade].count++;
      decades[decade].totalAppreciation += appreciation;
    }
  });

  const result = {};
  Object.keys(decades).forEach(decade => {
    result[`${decade}s`] = Math.round(
      (decades[decade].totalAppreciation / decades[decade].count) * 100
    ) / 100;
  });

  cache.set(cacheKey, result);
  return result;
}

// SEO Routes
app.get('/robots.txt', (req, res) => {
  res.type('text/plain');
  res.set('Cache-Control', 'public, max-age=86400');
  res.sendFile(path.join(__dirname, 'public', 'robots.txt'));
});

app.get('/sitemap.xml', (req, res) => {
  res.type('application/xml');
  res.set('Cache-Control', 'public, max-age=86400');
  res.sendFile(path.join(__dirname, 'public', 'sitemap.xml'));
});

// Fallback route - serve React app
app.get('*', (req, res) => {
  res.set({
    'Cache-Control': 'no-cache, no-store, must-revalidate',
    'X-Content-Type-Options': 'nosniff',
    'X-Frame-Options': 'SAMEORIGIN'
  });
  res.sendFile(path.join(__dirname, 'dist', 'index.html'));
});

// Start server
httpServer.listen(PORT, '0.0.0.0', () => {
  console.log(`
╔════════════════════════════════════════════════════════════════╗
║  OMEGA WATCH PRICE HISTORY - PERFORMANCE OPTIMIZED            ║
╚════════════════════════════════════════════════════════════════╝

🚀 Server running on port ${PORT}
📊 Dashboard: http://45.61.58.125:${PORT}
🔌 API: http://45.61.58.125:${PORT}/api
📈 Metrics: http://45.61.58.125:${PORT}/api/metrics

PERFORMANCE FEATURES:
✓ Brotli + Gzip compression
✓ Aggressive caching (TTL: 5min)
✓ CDN-ready headers (1 year cache)
✓ Resource hints (preload, preconnect)
✓ HTTP/2 ready
✓ Performance monitoring
✓ Pre-compressed responses
✓ Smart cache invalidation

BLAZING FAST! 🔥
  `);
});