// defines:
// variable ws (the websocket)
// variable wsReady (boolean)
// variable wsVerbose (boolean)
// wsSend(msg) (send a message when websocket is ready)
// wsOnMessage(function(event) {...}) (react to messages)
// wsOnOpen(function() {}) (react to opening of websocket)
sclass HInitWebSocket {
  S wsVar = "ws";
  S readyMsg = "WebSocket ready!";
  bool handleEvals = true; // automatically handle {"eval":"jsCode();"}
  
  S headStuff aka get() {
    ret hreconnectingWebSockets() + hscript(js());
  }
  
  LS dependencies() {
    ret ll(hjssnippet(hreconnectingWebSockets_snippetID(), "data-comment" := "ReconnectingWebSocket"));
  }
  
  S js() {
    ret formatDollarVars([[
      var wsReady = false;
      var wsInitialMsgs = [];
      var wsMsgListeners = [];
      var wsOpenListeners = [];
      var wsVerbose = $wsVerbose;
      var wsURL = ((window.location.protocol === "https:") ? "wss://" : "ws://") + window.location.host
        + window.location.pathname + window.location.search;
        
      var ]] + wsVar + [[ = new ReconnectingWebSocket(wsURL);
      
      ]] + wsVar + [[.onopen = function(event) {
        wsReady = true;
        console.log(]] + jsQuote(readyMsg + " ") + [[+ wsURL);
        
        wsOpenListeners.forEach(function(f) { f(); });

        ws.onmessage = function(event) {
          wsMsgListeners.forEach(function(listener) {
            listener(event);
          });
        };

        wsInitialMsgs.forEach(function(msg) {
          if (wsVerbose) console.log("Sending initial msg: " + msg);
          ws.send(msg);
        });
        wsInitialMsgs = [];
      };
      
      // send it now if ws is open already or when ws was opened
      function wsSend(msg) {
        if (wsReady) {
        wsInitialMsgs.push(msg);
          if (wsVerbose) console.log("Sending initial msg: " + msg);
          ws.send(msg);
        }
      }
      
      function wsOnOpen(f) {
        wsOpenListeners.push(f);      
      }
      
      function wsOnMessage(f) {
        wsMsgListeners.push(f);      
      }
      
      ]], +wsVerbose) + (!handleEvals ? "" : "wsOnMessage(" + js_evalOnWebSocketMessage() + ");\n";
  }
}