// utils.js
// by Luca Bertaiola
// luca@luglio7.com / www.luglio7.com
// v: 1.1

var utils = {

	log : function(obj)
	{
	
		obj = (typeof(obj) === 'object')? obj : {};
	
		// properties
		
		var that		= this;
		
		this.history	= [];
		this.maxRecords	= (typeof(obj.maxRecords) === 'number')? obj.maxRecords : 50;
		
		// methods
		
		this.log = function(record)
		{
			that.history = that.history.reverse();
			that.history.push(record);
			that.history = that.history.reverse();
			
			if(that.history.length > that.maxRecords)
			{
				that.history.pop();
			};
			
			return that.history;
		}
		
		this.last = function()
		{
			if(that.history[0])
			{
				return that.history[0];
			}
			return false;
		}
		
	}, 

	loop : function(obj)
	{
	
		obj = (typeof(obj) === 'object')? obj : {};
	
		// properties
		
		var that		= this;
		
		this.min		= (typeof(obj.min) === 'number')?		obj.min : 0;
		this.max		= (typeof(obj.max) === 'number')?		obj.max : 10;
		this.index		= (typeof(obj.index) === 'number')?		obj.index : this.min;
		this.direction	= (typeof(obj.direction) === 'number')?	obj.direction : 1;
		
		// methods
		
		this.verify	= function()
		{
			// verify index
		
			if( (this.index < this.min) || (this.index > this.max) )
			{
				this.index = this.min;
			}
			
			// verify direction
			
			if((this.direction < 0) || (this.direction > 1) )
			{
				this.direction = 1;
			}
		}
		
		this.next	= function(set)
		{
			this.verify();
			
			var nextIndex;
			
			if(typeof(set) === 'undefined')
				set = true;
			
			if(!this.direction)
			{
				nextIndex = ((this.index - 1) < this.min)? this.max : this.index - 1;
			}
			else
			{
				nextIndex = ((this.index + 1) > this.max)? this.min  : this.index + 1;
			}
			
			if(set)
				this.index = nextIndex;
				
			return nextIndex;
		}
		
		this.last	= function()
		{
			this.verify();
			this.reverse();
			var lastIndex = this.next(false);
			this.reverse();
			
			return lastIndex;
		}
		
		this.reset	= function()
		{
			this.verify();
			this.index = this.min;
			
			return this.index;
		}
		
		this.reverse = function()
		{
			this.verify();
			this.direction = (this.direction == 1)? 0 : 1;
			
			return this.direction;
		}
		
		// verify properties on init
		
		this.verify();
		
	}
	
}