Friends.FieldValidator = new function() {
    this.prefix = 'FieldValidator-';
    this.createFromTag = function(element, params) {
        new Friends.FieldValidator[params.type](element, params);
    }
    this.getNotes = function(element) {
        var notes = {__visible__: null};
        var tags = y5.Dom.getDescendants(element, '*', new RegExp( this.prefix + 'note-\\w+', 'ig'));
        for(var i = 0, l = tags.length; i < l; i++) {
            var name = y5.Components.getName(tags[i].className, this.prefix + 'note-')
            notes[name] = tags[i];
            if (notes[name].style.display != 'none') {
                notes.__visible__ = notes[name];
            }
        }
        return notes;
    }
    this.showNote = function(notes, note) {
        if (notes.__visible__) {
            notes.__visible__.style.display = 'none';
        }
        if (notes[note]) {
            notes[note].style.display = 'block';
            notes.__visible__ = notes[note];
        }else{
            notes.__visible__ = null;
        }
    };
    this.onlyNumbers = function(string) {
        return /^\d+$/.test(string);
    };

	/**
	 *	input states
	 */
	this.ERROR		= "error";
	this.SUCCESS	= "success";
	this.EMPTY		= "empty";
	this.PROVED		= "proved";
	this.NOT_PROVED	= "notProved";
};

Friends.FieldValidator.ICQ = function(element, params) {
    var _this = this;
    this.field = y5.Dom.getDescendant(element, '*', this.prefix + 'field');
    this.notes = this.getNotes(element);
    function check() {
        _this.check();
    }
    y5.Events.create('keyup', check, element, true);

    this.check = function() {
        var result = this.SUCCESS;
        if (this.field.value.length && !this.onlyNumbers(this.field.value)) {
            result = this.ERROR;
        }
        y5.Events.notify('y5:validationState', this.field, true, {state: result, element: this.field});
        this.showNote(this.notes, result);
    };
};
Friends.FieldValidator.ICQ.prototype = Friends.FieldValidator;

Friends.FieldValidator.Email = function(element, params){
    var _this = this;
    this.field = y5.Dom.getDescendant(element, '*', this.prefix + 'field');
    this.notes = this.getNotes(element);
    function check(e) {
        if (typeof(e.value) != y5.Vars.UNDEF && e.value === null){
            return;
        }
        _this.check(true);
    }
    if (params.eventType) {
        var elements = document.getElementsByTagName(params.eventTargetTagName);
        if (elements.length > 0) {
            var obj = elements[params.eventTargetName];
            new y5.AEventListener(params.eventType,
                function(e) {
                    if (_this.check() == _this.ERROR) {
                        e.preventDefault();
                    }
                }, obj, true);
        }
    }
    else {
        y5.Events.create('change', check, this.field, true);
        y5.Events.observe('y5:change', check, this.field, true);
    }

    this.email = function(string){
        return /^[\w-]+([\.+][\w-]+)*@([\w-]+\.)+[a-z]{2,7}$/i.test(string);
    };

    this.check = function(init) {
        var result = this.NOT_PROVED;
        var email = this.field.value;
        var placeholder =  this.field.getAttribute('placeholder');

        if ((email == '' || placeholder && email == placeholder) && init){
            result = this.EMPTY;
        }else if (new RegExp('\\|' + email + '\\|').test(this.validated)){
            result = this.PROVED;
        }else if(!this.email(email)) {
            result = this.ERROR;
        }
        y5.Events.notify('y5:validationState', this.field, true, {state:result,element:this.field});
        this.showNote(this.notes, result);
        return result;
    };

    this.getValidatedEmails = function(string) {
        return string.replace(/<[^>]*>/ig, '|').replace(/\|\|/ig, '|');
    };

    this.validated = params.data ? this.getValidatedEmails(params.data) : '';
    this.check(true);
}
Friends.FieldValidator.Email.prototype = Friends.FieldValidator;

y5.require(['Events'], function() {y5.loaded('{Friends}.FieldValidator')})