Add state.js with basic tracking and savefile properties

src/tracker/state.js

@@ -0,0 +1,105 @@
+var STATE = (function(){
+  var stateChangedEvents = [];
+  
+  var triggerStateChanged = function(){
+    for(var callback of stateChangedEvents){
+      callback();
+    }
+  };
+  
+  /*
+   * Internal class constructor.
+   */
+  var CLS = function(){
+    this.resetState();
+  };
+  
+  /*
+   * Resets the state to default values.
+   */
+  CLS.prototype.resetState = function(){
+    this._savefile = null;
+    this._isTracking = false;
+    triggerStateChanged();
+  };
+  
+  /*
+   * Returns the savefile object, creates a new one if needed.
+   */
+  CLS.prototype.getSavefile = function(){
+    if (!this._savefile){
+      this._savefile = new SAVEFILE();
+    }
+    
+    return this._savefile;
+  };
+  
+  /*
+   * Returns true if the database file contains any data.
+   */
+  CLS.prototype.hasSavedData = function(){
+    return this._savefile != null;
+  };
+  
+  /*
+   * Returns true if currently tracking message.
+   */
+  CLS.prototype.isTracking = function(){
+    return this._isTracking;
+  };
+  
+  /*
+   * Toggles the tracking state.
+   */
+  CLS.prototype.toggleTracking = function(){
+    this._isTracking = !this._isTracking;
+    triggerStateChanged();
+  };
+  
+  /*
+   * Combines current savefile with the provided one.
+   */
+  CLS.prototype.uploadSavefile = function(readFile){
+    this.getSavefile().combineWith(readFile);
+    triggerStateChanged();
+  };
+  
+  /*
+   * Triggers a savefile download, if available.
+   */
+  CLS.prototype.downloadSavefile = function(){
+    if (this.hasSavedData()){
+      DOM.downloadTextFile("dht.txt", this._savefile.toJson());
+    }
+  };
+  
+  /*
+   * Registers a Discord server and channel.
+   */
+  CLS.prototype.addDiscordChannel = function(serverName, serverType, channelId, channelName){
+    var serverIndex = this.getSavefile().findOrRegisterServer(serverName, serverType);
+    
+    if (this.getSavefile().tryRegisterChannel(serverIndex, channelId, channelName) === true){
+      triggerStateChanged();
+    }
+  };
+  
+  /*
+   * Adds all messages from the array to the specified channel.
+   */
+  CLS.prototype.addDiscordMessages = function(channelId, discordMessageArray){
+    if (this.getSavefile().addMessagesFromDiscord(channelId, discordMessageArray)){
+      triggerStateChanged();
+    }
+  };
+  
+  /*
+   * Adds a listener that is called whenever the state changes. If trigger is true, the callback is ran after adding it to the listener list.
+   */
+  CLS.prototype.onStateChanged = function(callback, trigger){
+    stateChangedEvents.push(callback);
+    trigger && callback();
+  };
+  
+  return new CLS();
+})();