const url = require('url');
const state = require('../../infrastructure/state');
const { trackRequest } = require('../../maintenance/metrics');
const { createErrorResponse } = require('../../infrastructure/error_handler');
const { metrics } = require('../../maintenance/metrics');

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

  if (method === 'GET' && urlPath === '/api/status') {
    try {
      const status = {
        isMaster: state.isMaster,
        isConnected: !!state.dnsPass,
        peersCount: state.connectedPeers.size,
        isShuttingDown: state.isShuttingDown || false
      };
      trackRequest('/api/status', true);
      res.writeHead(200, { 'Content-Type': 'application/json' });
      res.end(JSON.stringify(status));
    } catch (err) {
      trackRequest('/api/status', false);
      const errorResponse = createErrorResponse(err, 500);
      res.writeHead(errorResponse.statusCode, errorResponse.headers);
      res.end(errorResponse.body);
    }
    return true;
  }

  if (method === 'POST' && urlPath === '/api/shutdown') {
    try {
      const { logInfo } = require('../../infrastructure/logger');
      
      // Send success response before shutting down
      res.writeHead(200, { 'Content-Type': 'application/json' });
      res.end(JSON.stringify({
        success: true,
        message: 'Graceful shutdown initiated. Process will exit after cleanup completes.'
      }));
      
      // Trigger graceful shutdown after sending response
      setTimeout(() => {
        logInfo('Admin', 'Initiating graceful shutdown (without cleaning storage)...');
        process.emit('SIGTERM');
      }, 500); // Small delay to ensure response is sent
    } catch (err) {
      const errorResponse = createErrorResponse(err, 500);
      res.writeHead(errorResponse.statusCode, errorResponse.headers);
      res.end(errorResponse.body);
    }
    return true;
  }

  if (method === 'GET' && urlPath === '/api/health') {
    try {
      const query = url.parse(req.url, true).query;
      const probeType = query.probe || 'liveness';
      
      const dnsHealthy = !!state.dnsPass && state.dnsPass.opened !== false;
      const proxyHealthy = process.env.DISABLE_PROXY_SERVER !== 'true';
      const swarmHealthy = state.connectedPeers !== undefined;
      
      const corestoreHealthy = state.dnsPass && state.dnsPass.base && state.dnsPass.base.writable !== undefined;
      const hyperswarmHealthy = swarmHealthy;
      
      const dnsServerHealthy = process.env.DISABLE_DNS_SERVER !== 'true';
      const httpsServerHealthy = process.env.DISABLE_PROXY_SERVER !== 'true';
      
      const allServicesHealthy = dnsHealthy && proxyHealthy && swarmHealthy && corestoreHealthy && hyperswarmHealthy;
      const status = allServicesHealthy ? 'healthy' : 'degraded';
      
      const health = {
        status: status,
        timestamp: new Date().toISOString(),
        uptime: Date.now() - (metrics?.startTime || Date.now()),
        probe: probeType,
        services: {
          dns: {
            enabled: dnsServerHealthy,
            healthy: dnsHealthy,
            initialized: !!state.dnsPass,
            details: {
              passReady: state.dnsPass?.opened !== false,
              domainsCount: state.domainToIPMap?.size || 0
            }
          },
          proxy: {
            enabled: httpsServerHealthy,
            healthy: proxyHealthy,
            details: {
              httpsEnabled: process.env.DISABLE_PROXY_SERVER !== 'true',
              httpEnabled: process.env.DISABLE_PROXY_SERVER !== 'true'
            }
          },
          swarm: {
            healthy: swarmHealthy,
            details: {
              connectedPeers: state.connectedPeers?.size || 0,
              isMaster: state.isMaster || false
            }
          }
        },
        dependencies: {
          corestore: {
            healthy: corestoreHealthy,
            details: {
              initialized: !!state.dnsPass,
              writable: state.dnsPass?.base?.writable || false
            }
          },
          hyperswarm: {
            healthy: hyperswarmHealthy,
            details: {
              connectedPeers: state.connectedPeers?.size || 0
            }
          }
        }
      };
      
      if (probeType === 'readiness') {
        const ready = allServicesHealthy && state.dnsPass && state.dnsPass.ready;
        if (!ready) {
          trackRequest('/api/health', false);
          res.writeHead(503, { 'Content-Type': 'application/json' });
          res.end(JSON.stringify({ ...health, status: 'not_ready' }));
          return true;
        }
      }
      
      const statusCode = allServicesHealthy ? 200 : 503;
      trackRequest('/api/health', allServicesHealthy);
      res.writeHead(statusCode, { 'Content-Type': 'application/json' });
      res.end(JSON.stringify(health));
    } catch (err) {
      trackRequest('/api/health', false);
      const errorResponse = createErrorResponse(err, 500);
      res.writeHead(errorResponse.statusCode, errorResponse.headers);
      res.end(errorResponse.body);
    }
    return true;
  }

  return false;
}

module.exports = { handleStatusRoutes };