/**
 * Copyright 2013 IBM Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/
 
// Simple node to introduce a pause into a flow

// Require main module
var RED = require("../../red/red");

// main node definition
function DelayNode(n) {
   RED.nodes.createNode(this,n);
   
   this.pauseType = n.pauseType;
   this.timeout = n.timeout * 1000;
   this.rate = 1000/n.rate;
   this.name = n.name;
   this.idList = [];
   this.buffer = [];
   var node= this;
   
   if (this.pauseType == "delay") {
      this.on("input", function(msg) {
        var node= this;
        var id;
        id = setTimeout(function(){
          node.idList.splice(node.idList.indexOf(id),1);
          node.send(msg);
        }, node.timeout);
        this.idList.push(id);
      });
   } else if (this.pauseType == "rate") {
   
     this.intervalID = setInterval(function() {
      if (node.buffer.length > 0) {
        node.send(node.buffer.shift());
      }
     },this.rate);
   
     this.on("input", function(msg) {
       this.buffer.push(msg);
       if (this.buffer.length > 1000) {
         this.warn(this.name + " buffer exceeded 1000 messages");
       }
     });
   }
}

// register node
RED.nodes.registerType("delay",DelayNode);

DelayNode.prototype.close = function() {

   if (this.pauseType == "delay") {
     for (var i=0; i<this.idList.length; i++ ) {
       clearTimeout(this.idList[i]);
     }
     this.idList = [];
   } else if (this.pauseType == "rate") {
     clearInterval(this.intervalID);
     this.buffer = [];
   }
}