/**
 * QUIXZOOM Zoomer API (Simple - no dependencies)
 * 
 * Endpoints för Zoomer-hantering:
 * - CRUD för Zoomers
 * - Onboarding progress
 * - Quality scores
 * - Mission assignment
 * - Regional coordinators
 */

const http = require('http');
const url = require('url');

// Mock database
const zoomers = new Map();
const missions = new Map();

// Demo data
const demoZoomer = {
  id: 'zoomer_bangkok_001',
  name: 'Somchai',
  email: 'somchai@example.com',
  phone: '+66-81-234-5678',
  location: 'Bangkok, Sukhumvit',
  level: 4,
  status: 'trusted',
  role: 'regional_coordinator',
  area: 'Sukhumvit',
  createdAt: '2026-06-15',
  scores: {
    overall: 0.84,
    gps: [3, 4, 3, 5, 4, 3, 4, 5, 3, 4],
    image: [0.9, 0.85, 0.9, 0.8, 0.9, 0.85, 0.9, 0.9, 0.85, 0.9],
    corrections: 2,
    approvedObservations: 45,
    totalObservations: 50,
    confirmations: 8,
    responseTime: [300, 450, 200, 600, 350, 400, 250, 500, 300, 350],
    completionRate: [1, 1, 1, 1, 0, 1, 1, 1, 1, 1],
  },
};

zoomers.set(demoZoomer.id, demoZoomer);

function calculateQualityScore(zoomer) {
  const scores = zoomer.scores;
  
  const avgGps = scores.gps.length > 0
    ? scores.gps.reduce((a, b) => a + b, 0) / scores.gps.length
    : 999;
  const gpsScore = Math.max(0, 1 - (avgGps / 10));
  
  const avgImage = scores.image.length > 0
    ? scores.image.reduce((a, b) => a + b, 0) / scores.image.length
    : 0;
  
  const correctionRate = scores.totalObservations > 0
    ? scores.corrections / scores.totalObservations
    : 0;
  const correctionScore = Math.max(0, 1 - correctionRate);
  
  const approvalRate = scores.totalObservations > 0
    ? scores.approvedObservations / scores.totalObservations
    : 0;
  
  const confirmationScore = Math.min(1, scores.confirmations / 10);
  
  const avgResponse = scores.responseTime.length > 0
    ? scores.responseTime.reduce((a, b) => a + b, 0) / scores.responseTime.length
    : 3600;
  const responseScore = Math.max(0, 1 - (avgResponse / 3600));
  
  const avgCompletion = scores.completionRate.length > 0
    ? scores.completionRate.reduce((a, b) => a + b, 0) / scores.completionRate.length
    : 0;
  
  const overall =
    gpsScore * 0.20 +
    avgImage * 0.20 +
    correctionScore * 0.15 +
    approvalRate * 0.20 +
    confirmationScore * 0.10 +
    responseScore * 0.10 +
    avgCompletion * 0.05;
  
  return {
    overall: Math.round(overall * 100) / 100,
    breakdown: {
      gps: Math.round(gpsScore * 100) / 100,
      image: Math.round(avgImage * 100) / 100,
      corrections: Math.round(correctionScore * 100) / 100,
      approval: Math.round(approvalRate * 100) / 100,
      confirmations: Math.round(confirmationScore * 100) / 100,
      response: Math.round(responseScore * 100) / 100,
      completion: Math.round(avgCompletion * 100) / 100,
    },
  };
}

const server = http.createServer((req, res) => {
  const parsedUrl = url.parse(req.url, true);
  const path = parsedUrl.pathname;
  const method = req.method;
  
  res.setHeader('Content-Type', 'application/json');
  res.setHeader('Access-Control-Allow-Origin', '*');
  
  // GET /api/v1/zoomers
  if (path === '/api/v1/zoomers' && method === 'GET') {
    const results = Array.from(zoomers.values());
    res.writeHead(200);
    res.end(JSON.stringify({
      success: true,
      count: results.length,
      zoomers: results,
    }));
    return;
  }
  
  // GET /api/v1/zoomers/:id
  const zoomerMatch = path.match(/^\/api\/v1\/zoomers\/([^\/]+)$/);
  if (zoomerMatch && method === 'GET') {
    const zoomer = zoomers.get(zoomerMatch[1]);
    if (zoomer) {
      res.writeHead(200);
      res.end(JSON.stringify({ success: true, zoomer }));
    } else {
      res.writeHead(404);
      res.end(JSON.stringify({ success: false, error: 'Zoomer not found' }));
    }
    return;
  }
  
  // GET /api/v1/zoomers/:id/score
  const scoreMatch = path.match(/^\/api\/v1\/zoomers\/([^\/]+)\/score$/);
  if (scoreMatch && method === 'GET') {
    const zoomer = zoomers.get(scoreMatch[1]);
    if (zoomer) {
      res.writeHead(200);
      res.end(JSON.stringify({
        success: true,
        score: calculateQualityScore(zoomer),
      }));
    } else {
      res.writeHead(404);
      res.end(JSON.stringify({ success: false, error: 'Zoomer not found' }));
    }
    return;
  }
  
  // GET /api/v1/stats
  if (path === '/api/v1/stats' && method === 'GET') {
    const allZoomers = Array.from(zoomers.values());
    const stats = {
      total: allZoomers.length,
      byLevel: {
        0: allZoomers.filter(z => z.level === 0).length,
        1: allZoomers.filter(z => z.level === 1).length,
        2: allZoomers.filter(z => z.level === 2).length,
        3: allZoomers.filter(z => z.level === 3).length,
        4: allZoomers.filter(z => z.level === 4).length,
      },
      byStatus: {
        onboarding: allZoomers.filter(z => z.status === 'onboarding').length,
        active: allZoomers.filter(z => z.status === 'active').length,
        trusted: allZoomers.filter(z => z.status === 'trusted').length,
      },
      coordinators: allZoomers.filter(z => z.role === 'regional_coordinator').length,
      avgScore: allZoomers.length > 0
        ? allZoomers.reduce((sum, z) => sum + calculateQualityScore(z).overall, 0) / allZoomers.length
        : 0,
    };
    
    res.writeHead(200);
    res.end(JSON.stringify({ success: true, stats }));
    return;
  }
  
  // GET /api/v1/coordinators
  if (path === '/api/v1/coordinators' && method === 'GET') {
    const coordinators = Array.from(zoomers.values())
      .filter(z => z.role === 'regional_coordinator');
    
    res.writeHead(200);
    res.end(JSON.stringify({
      success: true,
      count: coordinators.length,
      coordinators,
    }));
    return;
  }
  
  // Health check
  if (path === '/health' && method === 'GET') {
    res.writeHead(200);
    res.end(JSON.stringify({ status: 'ok', service: 'zoomer-api' }));
    return;
  }
  
  // 404
  res.writeHead(404);
  res.end(JSON.stringify({ success: false, error: 'Not found' }));
});

const PORT = 3003;
server.listen(PORT, () => {
  console.log(`╔════════════════════════════════════════════════════════════╗`);
  console.log(`║     ZOOMER API RUNNING ON PORT ${PORT}                     ║`);
  console.log(`╚════════════════════════════════════════════════════════════╝\n`);
  console.log('Endpoints:');
  console.log('  GET  /api/v1/zoomers              - List all zoomers');
  console.log('  GET  /api/v1/zoomers/:id          - Get zoomer details');
  console.log('  GET  /api/v1/zoomers/:id/score    - Get quality score');
  console.log('  GET  /api/v1/stats                - System stats');
  console.log('  GET  /api/v1/coordinators         - List coordinators');
  console.log('  GET  /health                      - Health check');
  console.log('\nDemo zoomer: zoomer_bangkok_001');
});