/**
 * Firefrost Gaming - Servers API Worker
 * 
 * Cloudflare Worker that proxies Pterodactyl Panel API
 * to provide live server status for the website.
 * 
 * Deployed: https://servers-api.firefrostgaming.workers.dev
 * Created: April 3, 2026 (Chronicler #56 - The Velocity)
 * 
 * Environment Variables Required:
 *   PANEL_URL - Pterodactyl panel URL (https://panel.firefrostgaming.com)
 *   CLIENT_API_KEY - Pterodactyl client API key
 */

export default {
  async fetch(request, env) {
    // Determine allowed origin
    const origin = request.headers.get('Origin');
    const allowedOrigins = [
      'https://firefrostgaming.com',
      'https://firefrost-website.pages.dev'
    ];
    const allowedOrigin = allowedOrigins.includes(origin) 
      ? origin 
      : 'https://firefrostgaming.com';

    // Handle CORS preflight
    if (request.method === 'OPTIONS') {
      return new Response(null, {
        headers: {
          'Access-Control-Allow-Origin': allowedOrigin,
          'Access-Control-Allow-Methods': 'GET, OPTIONS',
          'Access-Control-Allow-Headers': 'Content-Type'
        }
      });
    }

    const PANEL_URL = env.PANEL_URL;
    const API_KEY = env.CLIENT_API_KEY;

    try {
      // Fetch server list
      const listResponse = await fetch(`${PANEL_URL}/api/client`, {
        headers: {
          'Authorization': `Bearer ${API_KEY}`,
          'Accept': 'application/json'
        }
      });
      
      const listData = await listResponse.json();
      
      if (!listData.data) throw new Error("Failed to fetch server list");

      // Fetch live stats for all servers
      const serverPromises = listData.data.map(async (server) => {
        const id = server.attributes.identifier;
        
        const statsResponse = await fetch(
          `${PANEL_URL}/api/client/servers/${id}/resources`, 
          {
            headers: {
              'Authorization': `Bearer ${API_KEY}`,
              'Accept': 'application/json'
            }
          }
        );
        
        const stats = await statsResponse.json();
        const isRunning = stats.attributes?.current_state === 'running';

        return {
          id: id,
          name: server.attributes.name,
          status: isRunning ? 'Online' : 'Offline',
          players: isRunning ? (stats.attributes?.resources?.players || 0) : 0,
          description: server.attributes.description
        };
      });

      const finalServers = await Promise.all(serverPromises);

      return new Response(JSON.stringify({ servers: finalServers }), {
        headers: {
          'Content-Type': 'application/json',
          'Access-Control-Allow-Origin': allowedOrigin,
          'Cache-Control': 'public, s-maxage=60, max-age=60'
        }
      });

    } catch (error) {
      return new Response(JSON.stringify({ 
        error: "Servers temporarily unreachable", 
        servers: [] 
      }), {
        status: 500,
        headers: { 
          'Content-Type': 'application/json',
          'Access-Control-Allow-Origin': allowedOrigin
        }
      });
    }
  }
}