const { trackRequestWithTiming, trackRequest } = require('../../../maintenance/metrics');
const { logError } = require('../../../infrastructure/logger');
const { createErrorResponse } = require('../../../infrastructure/error_handler');
const { collectAdminStats, collectHistoricalMinutes } = require('../stats-collector');

async function handleStatsRoutes(req, res) {
  const urlPath = req.urlPath || new URL(req.url, `https://${req.headers.host}`).pathname;
  const method = req.method;

  if (method === 'GET' && urlPath === '/api/stats') {
    try {
      const startTime = Date.now();
      const stats = await collectAdminStats();
      const responseTime = Date.now() - startTime;
      trackRequestWithTiming('/api/stats', true, responseTime);
      res.writeHead(200, { 'Content-Type': 'application/json' });
      res.end(JSON.stringify(stats));
    } catch (err) {
      logError('Admin', `Error in /api/stats: ${err.message}`, err);
      trackRequest('/api/stats', false);
      const errorResponse = createErrorResponse(err, 500);
      res.writeHead(errorResponse.statusCode, errorResponse.headers);
      res.end(errorResponse.body);
    }
    return true;
  }

  if (method === 'GET' && urlPath === '/api/stats/historical') {
    try {
      let minutes = 60;
      if (req.url.includes('?')) {
        const queryString = req.url.split('?')[1];
        const params = new URLSearchParams(queryString);
        const minutesParam = params.get('minutes');
        if (minutesParam) {
          minutes = parseInt(minutesParam, 10);
        }
      }
      const startTime = Date.now();
      const historical = collectHistoricalMinutes(minutes);
      const responseTime = Date.now() - startTime;
      trackRequestWithTiming('/api/stats/historical', true, responseTime);
      res.writeHead(200, { 'Content-Type': 'application/json' });
      res.end(JSON.stringify(historical));
    } catch (err) {
      logError('Admin', `Error in /api/stats/historical: ${err.message}`, err);
      trackRequest('/api/stats/historical', false);
      const errorResponse = createErrorResponse(err, 500);
      res.writeHead(errorResponse.statusCode, errorResponse.headers);
      res.end(errorResponse.body);
    }
    return true;
  }

  return false;
}

module.exports = { handleStatsRoutes };