import http from 'http';
import { SentinelClient } from './client';
import { config } from './config';

export function startHealthServer(client: SentinelClient): void {
  const server = http.createServer((req, res) => {
    res.setHeader('Access-Control-Allow-Origin', '*');
    res.setHeader('Access-Control-Allow-Methods', 'GET, OPTIONS');
    res.setHeader('Content-Type', 'application/json');

    if (req.method === 'OPTIONS') {
      res.writeHead(200);
      res.end();
      return;
    }

    if (req.url === '/health') {
      const guilds = client.guilds.cache.size;
      const commands = client.stores.get('commands')?.size || 0;
      
      res.writeHead(200);
      res.end(JSON.stringify({
        status: client.isReady() ? 'online' : 'offline',
        guilds,
        commands,
        uptime: Math.floor(process.uptime()),
        timestamp: new Date().toISOString(),
        bot: {
          tag: client.user?.tag || 'Not ready',
          id: client.user?.id,
        },
      }));
      return;
    }

    if (req.url === '/stats') {
      const guildStats = client.guilds.cache.map(g => ({
        id: g.id,
        name: g.name,
        memberCount: g.memberCount,
      }));

      res.writeHead(200);
      res.end(JSON.stringify({
        guilds: guildStats,
        totalMembers: guildStats.reduce((sum, g) => sum + g.memberCount, 0),
        uptime: Math.floor(process.uptime()),
      }));
      return;
    }

    res.writeHead(404);
    res.end(JSON.stringify({ error: 'Not found' }));
  });

  server.listen(config.health.port, () => {
    console.log(`🏥 Health server running on port ${config.health.port}`);
  });
}