text: /**
   * Copyright JS Foundation and other contributors, http://js.foundation
   *
   * 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.
   **/
  
  var util = require("util");
  var EventEmitter = require("events").EventEmitter;
  var when = require("when");
  
  var redUtil = require("../util");
  var Log = require("../log");
  var context = require("./context");
  var flows = require("./flows");
  
  function Node(n) {
      this.id = n.id;
      this.type = n.type;
      this.z = n.z;
      this._closeCallbacks = [];
  
      if (n.name) {
          this.name = n.name;
      }
      if (n._alias) {
          this._alias = n._alias;
      }
      this.updateWires(n.wires);
  }
  
  util.inherits(Node, EventEmitter);
  
  Node.prototype.updateWires = function(wires) {
      //console.log("UPDATE",this.id);
      this.wires = wires || [];
      delete this._wire;
  
      var wc = 0;
      this.wires.forEach(function(w) {
          wc+=w.length;
      });
      this._wireCount = wc;
      if (wc === 0) {
          // With nothing wired to the node, no-op send
          this.send = function(msg) {}
      } else {
          this.send = Node.prototype.send;
          if (this.wires.length === 1 && this.wires[0].length === 1) {
              // Single wire, so we can shortcut the send when
              // a single message is sent
              this._wire = this.wires[0][0];
          }
      }
  
  }
  Node.prototype.context = function() {
      if (!this._context) {
          this._context = context.get(this._alias||this.id,this.z);
      }
      return this._context;
  }
  
  Node.prototype._on = Node.prototype.on;
  
  Node.prototype.on = function(event, callback) {
      var node = this;
      if (event == "close") {
          this._closeCallbacks.push(callback);
      } else {
          this._on(event, callback);
      }
  };
  
  Node.prototype.close = function(removed) {
      //console.log(this.type,this.id,removed);
      var promises = [];
      var node = this;
      for (var i=0;i<this._closeCallbacks.length;i++) {
          var callback = this._closeCallbacks[i];
          if (callback.length > 0) {
              promises.push(
                  when.promise(function(resolve) {
                      var args = [];
                      if (callback.length === 2) {
                          args.push(!!removed);
                      }
                      args.push(resolve);
                      callback.apply(node, args);
                  })
              );
          } else {
              callback.call(node);
          }
      }
      if (promises.length > 0) {
          return when.settle(promises).then(function() {
              if (this._context) {
                 return context.delete(this._alias||this.id,this.z);
              }
          });
      } else {
          if (this._context) {
              return context.delete(this._alias||this.id,this.z);
          }
          return;
      }
  };
  
  Node.prototype.send = function(msg) {
      var msgSent = false;
      var node;
  
      if (msg === null || typeof msg === "undefined") {
          return;
      } else if (!util.isArray(msg)) {
          if (this._wire) {
              // A single message and a single wire on output 0
              // TODO: pre-load flows.get calls - cannot do in constructor
              //       as not all nodes are defined at that point
              if (!msg._msgid) {
                  msg._msgid = redUtil.generateId();
              }
              this.metric("send",msg);
              node = flows.get(this._wire);
              /* istanbul ignore else */
              if (node) {
                  node.receive(msg);
              }
              return;
          } else {
              msg = [msg];
          }
      }
  
      var numOutputs = this.wires.length;
  
      // Build a list of send events so that all cloning is done before
      // any calls to node.receive
      var sendEvents = [];
  
      var sentMessageId = null;
  
      // for each output of node eg. [msgs to output 0, msgs to output 1, ...]
      for (var i = 0; i < numOutputs; i++) {
          var wires = this.wires[i]; // wires leaving output i
          /* istanbul ignore else */
          if (i < msg.length) {
              var msgs = msg[i]; // msgs going to output i
              if (msgs !== null && typeof msgs !== "undefined") {
                  if (!util.isArray(msgs)) {
                      msgs = [msgs];
                  }
                  var k = 0;
                  // for each recipent node of that output
                  for (var j = 0; j < wires.length; j++) {
                      node = flows.get(wires[j]); // node at end of wire j
                      if (node) {
                          // for each msg to send eg. [[m1, m2, ...], ...]
                          for (k = 0; k < msgs.length; k++) {
                              var m = msgs[k];
                              if (m !== null && m !== undefined) {
                                  m._origin = this.id;
                                  /* istanbul ignore else */
                                  if (!sentMessageId) {
                                      sentMessageId = m._msgid;
                                  }
                                  if (msgSent) {
                                      var clonedmsg = redUtil.cloneMessage(m);
                                      sendEvents.push({n:node,m:clonedmsg});
                                  } else {
                                      sendEvents.push({n:node,m:m});
                                      msgSent = true;
                                  }
                              }
                          }
                      }
                  }
              }
          }
      }
      /* istanbul ignore else */
      if (!sentMessageId) {
          sentMessageId = redUtil.generateId();
      }
      this.metric("send",{_msgid:sentMessageId});
  
      for (i=0;i<sendEvents.length;i++) {
          var ev = sendEvents[i];
          /* istanbul ignore else */
          if (!ev.m._msgid) {
              ev.m._msgid = sentMessageId;
          }
          ev.n.receive(ev.m);
      }
  };
  
  Node.prototype.receive = function(msg) {
      if (!msg) {
          msg = {};
      }
      if (!msg._msgid) {
          msg._msgid = redUtil.generateId();
      }
      this.metric("receive",msg);
      try {
          this.emit("input", msg);
      } catch(err) {
          this.error(err,msg);
      }
  };
  
  function log_helper(self, level, msg) {
      var o = {
          level: level,
          id: self.id,
          type: self.type,
          msg: msg
      };
      if (self._alias) {
          o._alias = self._alias;
      }
      if (self.z) {
          o.z = self.z;
      }
      if (self.name) {
          o.name = self.name;
      }
      Log.log(o);
  }
  
  Node.prototype.log = function(msg) {
      log_helper(this, Log.INFO, msg);
  };
  
  Node.prototype.warn = function(msg) {
      log_helper(this, Log.WARN, msg);
  };
  
  Node.prototype.error = function(logMessage,msg) {
      if (typeof logMessage != 'boolean') {
          logMessage = logMessage || "";
      }
      var handled = false;
      if (msg) {
          handled = flows.handleError(this,logMessage,msg);
      }
      if (!handled) {
          log_helper(this, Log.ERROR, logMessage);
      }
  };
  
  Node.prototype.debug = function(msg) {
      log_helper(this, Log.DEBUG, msg);
  }
  
  Node.prototype.trace = function(msg) {
      log_helper(this, Log.TRACE, msg);
  }
  
  /**
   * If called with no args, returns whether metric collection is enabled
   */
  Node.prototype.metric = function(eventname, msg, metricValue) {
      if (typeof eventname === "undefined") {
          return Log.metric();
      }
      var metrics = {};
      metrics.level = Log.METRIC;
      metrics.nodeid = this.id;
      metrics.event = "node."+this.type+"."+eventname;
      metrics.msgid = msg._msgid;
      metrics.value = metricValue;
      Log.log(metrics);
  }
  
  /**
   * status: { fill:"red|green", shape:"dot|ring", text:"blah" }
   */
  Node.prototype.status = function(status) {
      flows.handleStatus(this,status);
  };
  module.exports = Node;
  