var TMOChatHistory = {
	
	add: function(message) {
		TMOHistoryStack.addMessage(message);
	},
	
	get: function() {
		TMOHistoryStack.current();
	},
	
	reset: function() {
		TMOHistoryStack.reset();
	}
};

var TMOHistoryStack = {
	history : [],
	size : 50,
	index : -1,
	
	addMessage : function(message) {
		this._trim();
		this.history.unshift(new TMOChatMessage(message));
	},
	
	current : function() {
		this._next();
		message = this.history[this.index].getText();
		
		return message;
	},
	
	reset : function() {
		this.index = -1;
	},
	
	_next : function() {
		if(this._hasNext()) {
			this.index++;
		} else {
			this.reset();
		}
	},
	
	_hasNext : function() {
		return this.index < this.history.length;
	},
	
	_trim : function() {
		if(this.history.length == this.size) {
			this.history.pop();
		}
	}
};

function TMOChatMessage(message) {
	this.text = message;
}
TMOChatMessage.prototype = {
	
	getText : function() {
		return this.text;
	},
	
	getLength : function() {
		return text.length;
	}
};