/**
 * SQS Technologies
* Bogota - Colombia
* 7416418
*/

var raiz = null;
var ultimo = null;

function Nodo()
{
    var siguiente = null;
    var Id = 0;
    var obj = null;
    
    this.setSiguiente =  function(nodoSiguiente){ siguiente = nodoSiguiente;}
    this.setID =  function(newId){ Id = newId;}
    this.setObj =  function(newObj){ obj = newObj;}

    this.getSiguiente =  function(){ return siguiente;}
    this.getID =  function(){ return Id;}
    this.getObj =  function(){ return obj;}
}

function crearNodo(id, obj)
{
    var nodoNuevo = new Nodo();
    nodoNuevo.setObj(obj);
    nodoNuevo.setID(id);
    
    if(raiz==null)
    {
        raiz = nodoNuevo;
        ultimo = nodoNuevo;
    }
    else
    {
        ultimo.setSiguiente(nodoNuevo);
        ultimo = nodoNuevo;
    }
    return nodoNuevo;
}

function borrarNodo(Id)
{
    var temp = raiz;
    var ultimo = null;
    while(temp != null)
    {
        if(temp.getID() == Id)
        {
            if(temp ==  raiz)
            {
                raiz = raiz.getSiguiente();
                break;
            }
            else
            {
                ultimo.setSiguiente(temp.getSiguiente());
                temp = null;
                break;
            }
        }
        ultimo = temp;
        temp = temp.getSiguiente();
    }
}
var errores = '';
function mostrarNodos()
{
    errores =  '';
    var temp = raiz;
    var text = '';
    while(temp != null)
    {
        var arr = temp.getObj();
        //text+='';
        for(var obj in arr)
        {
            switch(arr[obj].tipo)
            {
                case 's':
                    if(arr[obj].value == '')
                    {
                        errores += '\n\t - El valor de ' + arr[obj].nombre + ' deberia ser escrito. ';
                    }
                    break;
                case 'f':
						if (isDate(arr[obj].value)==false)
						{
							errores += '\n\t - El valor de ' + arr[obj].nombre + ' deberia ser escrito como una fecha dd/mm/yyyy (es posible que tenga un dia que no existe, etc.). ';
						}
                    break;
                case 'n':
                    if(isNaN(arr[obj].value))
                    {
                        errores += '\n\t - El valor de ' + arr[obj].nombre + ' deberia ser un valor numerico. ';
                    }
                    if (arr[obj].value == '')
                    {
                        arr[obj].value = 0;
                    }
                    break;
            }
            if(arr[obj].type == "checkbox")
            {
				text += "°" + (arr[obj].checked ? "true" : "false");
            }
            else
            {
				text += "°" + arr[obj].value;
            }
        }
        text += "|";
        temp = temp.getSiguiente();
    }
    return text;
}

/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		//alert("EL formato de la fecha debe ser : dd/mm/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		//alert("Favor ingresar un mes valido")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		//alert("Favor ingresar un dia valido")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		//alert("favor ingresar 4 numeros para el año, desde"+minYear+" hasta "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		//alert("Fecha invalida")
		return false
	}
return true
}