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// server.js (Bun) — with CORS enabled for WS and HTTP
const rooms = new Map(); // roomId ⇒ Set<ServerWebSocket>

Bun.serve({
  port: Number(Bun.env.PORT) || 7860,

  fetch(req, server) {
    const url = new URL(req.url);

    // Handle CORS preflight
    if (req.method === "OPTIONS") {
      return new Response(null, {
        status: 204,
        headers: {
          "Access-Control-Allow-Origin": "*",
          "Access-Control-Allow-Methods": "GET, POST, OPTIONS",
          "Access-Control-Allow-Headers": "Content-Type, Upgrade",
          "Access-Control-Allow-Credentials": "true",
        },
      });
    }

    // Upgrade to WebSocket if requested
    if (req.headers.get("upgrade")?.toLowerCase() === "websocket") {
      // Accept the upgrade with CORS headers on the handshake
      const upgradeRes = server.upgrade(req, {
        headers: {
          "Access-Control-Allow-Origin": "*",
          "Access-Control-Allow-Credentials": "true",
        },
      });
      return upgradeRes ?? new Response("Upgrade failed", { status: 500 });
    }

    // Serve HTML UI for non-WebSocket requests
    if (url.pathname === "/") {
      return new Response(`<!doctype html>
<html><head>
  <title>Dubem Realtime Rooms</title>
  <meta charset="utf-8"/>
  <style>
    body { font-family: sans-serif; padding: 20px; background: #f0f0f0; }
    #log { border: 1px solid #ccc; height:200px; overflow-y:auto; padding:10px; background:#fff;}
    input, button { margin:5px 0; padding:8px; font-size:16px; }
  </style>
</head><body>
  <h2>Join a Room & Send Messages</h2>
  <input id="room" placeholder="Room ID"/>
  <button onclick="joinRoom()">Join Room</button>
  <div id="log"></div>
  <input id="msg" placeholder="Type a message" style="width:80%;"/>
  <button onclick="sendMsg()">Send</button>
  <script>
    var ws, currentRoom;
    window.addEventListener('load', function() {
      var scheme = location.protocol === 'https:' ? 'wss' : 'ws';
      var socketUrl = scheme + '://' + location.host + '/';
      ws = new WebSocket(socketUrl);
      ws.onopen = function(){ log('🔌 Connected'); };
      ws.onmessage = function(ev){
        var m = JSON.parse(ev.data);
        log('[' + m.roomId + '] ' + m.message);
      };
      ws.onerror = function(){ log('⚠️ WebSocket error'); };
      ws.onclose = function(c){ log('❌ Disconnected (code='+c.code+')'); };
    });
    function joinRoom(){
      var id = document.getElementById('room').value.trim();
      if(!id) return alert('Enter room ID');
      ws.send(JSON.stringify({ action:'join', roomId:id }));
      currentRoom = id; log('➡️ Joined '+id);
    }
    function sendMsg(){
      var t = document.getElementById('msg').value.trim();
      if(!t) return;
      if(!currentRoom) return alert('Join a room first');
      ws.send(JSON.stringify({ action:'post', roomId:currentRoom, message:t }));
      document.getElementById('msg').value = '';
    }
    function log(txt){
      var e = document.getElementById('log');
      e.innerHTML += '<div>'+txt+'</div>';
      e.scrollTop = e.scrollHeight;
    }
  </script>
</body></html>`, {
        headers: {
          "Content-Type": "text/html; charset=utf-8",
          "Access-Control-Allow-Origin": "*",
        }
      });
    }

    return new Response("Not Found", {
      status: 404,
      headers: { "Access-Control-Allow-Origin": "*" },
    });
  },

  websocket: {
    message(ws, raw) {
      let msg;
      try { msg = JSON.parse(raw); } catch { return; }

      if (msg.action === "join" && msg.roomId) {
        // Leave all rooms
        for (const set of rooms.values()) set.delete(ws);
        // Join target room
        let set = rooms.get(msg.roomId);
        if (!set) {
          set = new Set();
          rooms.set(msg.roomId, set);
        }
        set.add(ws);
      }

      if (msg.action === "post" && msg.roomId && msg.message) {
        const set = rooms.get(msg.roomId);
        if (!set) return;
        const payload = JSON.stringify({
          roomId:  msg.roomId,
          message: msg.message,
          timestamp: Date.now(),
        });
        for (const client of set) {
          if (client.readyState === 1) { // OPEN
            client.send(payload);
          }
        }
      }
    },

    close(ws) {
      // Clean up on disconnect
      for (const set of rooms.values()) set.delete(ws);
    }
  }
});

console.log("✅ Bun realtime server running on port " + (Bun.env.PORT || 7860));


// // server.js (Bun)
// // import { serve } from "bun";

// const rooms = new Map(); // roomId ⇒ Set<ServerWebSocket>

// Bun.serve({
//   port: Number(Bun.env.PORT) || 7860,

//   fetch(req, server) {
//     const url = new URL(req.url);

//     // Upgrade to WebSocket if requested
//     if (req.headers.get("upgrade")?.toLowerCase() === "websocket") {
//       // Accept the upgrade and attach room data if needed
//       return server.upgrade(req) ? undefined : new Response("Upgrade failed", { status: 500 });
//     }

//     // Serve HTML UI for non-WebSocket requests
//     if (url.pathname === "/") {
//       return new Response(`<!doctype html>
// <html><head>
//   <title>Dubem Realtime Rooms</title>
//   <meta charset="utf-8"/>
//   <style>
//     body { font-family: sans-serif; padding: 20px; background: #f0f0f0; }
//     #log { border: 1px solid #ccc; height:200px; overflow-y:auto; padding:10px; background:#fff;}
//     input, button { margin:5px 0; padding:8px; font-size:16px; }
//   </style>
// </head><body>
//   <h2>Join a Room & Send Messages</h2>
//   <input id="room" placeholder="Room ID"/>
//   <button onclick="joinRoom()">Join Room</button>
//   <div id="log"></div>
//   <input id="msg" placeholder="Type a message" style="width:80%;"/>
//   <button onclick="sendMsg()">Send</button>
//   <script>
//     var ws, currentRoom;
//     window.addEventListener('load', function() {
//       var scheme = location.protocol === 'https:' ? 'wss' : 'ws';
//       var socketUrl = scheme + '://' + location.host + '/';
//       ws = new WebSocket(socketUrl);
//       ws.onopen = function(){ log('🔌 Connected'); };
//       ws.onmessage = function(ev){
//         var m=JSON.parse(ev.data);
//         log('['+m.roomId+'] '+m.message);
//       };
//       ws.onerror = function(e){ log('⚠️ WebSocket error'); };
//       ws.onclose = function(c){ log('❌ Disconnected (code='+c.code+')'); };
//     });
//     function joinRoom(){
//       var id = document.getElementById('room').value.trim();
//       if(!id) return alert('Enter room ID');
//       ws.send(JSON.stringify({ action:'join', roomId:id }));
//       currentRoom = id; log('➡️ Joined '+id);
//     }
//     function sendMsg(){
//       var t = document.getElementById('msg').value.trim();
//       if(!t) return;
//       if(!currentRoom) return alert('Join a room first');
//       ws.send(JSON.stringify({ action:'post', roomId:currentRoom, message:t }));
//       document.getElementById('msg').value = '';
//     }
//     function log(txt){
//       var e=document.getElementById('log');
//       e.innerHTML+='<div>'+txt+'</div>'; e.scrollTop=e.scrollHeight;
//     }
//   </script>
// </body></html>`, {
//         headers: { "Content-Type": "text/html; charset=utf-8" }
//       });
//     }

//     return new Response("Not Found", { status: 404 });
//   },

//   websocket: {
//     message(ws, raw) {
//       let msg;
//       try { msg = JSON.parse(raw); } catch { return; }

//       if (msg.action === "join" && msg.roomId) {
//         // Leave all rooms
//         for (const set of rooms.values()) set.delete(ws);
//         // Join target room
//         let set = rooms.get(msg.roomId);
//         if (!set) {
//           set = new Set();
//           rooms.set(msg.roomId, set);
//         }
//         set.add(ws);
//       }

//       if (msg.action === "post" && msg.roomId && msg.message) {
//         const set = rooms.get(msg.roomId);
//         if (!set) return;
//         const payload = JSON.stringify({
//           roomId:  msg.roomId,
//           message: msg.message,
//           timestamp: Date.now(),
//         });
//         for (const client of set) {
//           if (client.readyState === 1) { // 1 === OPEN
//             client.send(payload);
//           }
//         }
//       }
//     },
//     close(ws) {
//       // Clean up on disconnect
//       for (const set of rooms.values()) set.delete(ws);
//     }
//   }
// });

// console.log("✅ Bun realtime server running on port " + (Bun.env.PORT || 7860));