var Validator = new Class({
	initialize: function(form,fields,params) {
		this.opt(form,fields,params); 
	},
	opt: function(form,fields,params) {
		this.form = $(form);
		this.labels = $(form).getElements('label');
		this.params = {
			onStart: null,
			onComplete: null,
			responseHTML: '',
			pattern: '',
			patterns: {
				VALID_NOT_ZERO: '/[^0]/',
				VALID_NOT_EMPTY: '/.+/',
				VALID_NUMBER: '/^\d+$/',
				VALID_EMAIL: '/^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/'
				}
			};
		this.fields = {}; 
		Object.extend(this.params,params || {});
		Object.extend(this.fields,fields || {});
	},
	validate: function() {
		for(i in this.fields) { 
			var field = $(i); 
			if(!this.check_field(field, this.fields[i])) {
				this.invalid(field, this.fields[i]);
				return false; 
			} else {
				this.valid(field, this.fields[i]);
			}; 
		}; 
	},
	check_field: function(field, arr) {
		switch(field.nodeName) {
			case 'INPUT':
				switch(field.type) {
					case 'file':
					case 'hidden':
					case 'password':
					case 'text':
						return this.type_text(field, arr); 
						break; 
					case 'checkbox':
						return this.type_checkbox(field, arr);
						break; 
					case 'submit':
					case 'button':
						break;
				};
				break; 
			case 'SELECT':
				return field.multiple ? this.type_multi(field, arr) : this.type_select(field, arr); 
				break;
			case 'TEXTAREA':
				return this.type_text(field, arr); 
				break; 
			case 'DIV':
				return this.type_radio(field, arr); 
				break; 
		};
	},
	type_text: function(field, arr) {
		var value = String($(field).value); 
		var pattern_key = arr.pattern; 
		if(typeof(pattern_key)==='string') {
			var pattern = this.params.patterns[pattern_key]; 
			this.pattern = pattern; 
			this.params.responseHTML = arr.responseHTML; 
			return value.search(eval(pattern))<0 ? false : true; 			
		
		} else if(typeof(pattern_key)==='object') { 
			var ret = false; 
			for(var i=0; i<pattern_key.length; i++) {
				var pattern = this.params.patterns[pattern_key[i]]; 
				ret = value.search(eval(pattern))<0 ? false : true; 
				if(!ret) {
					this.params.pattern = pattern; 
					this.params.responseHTML = arr.responseHTML[i]; 
					this.pattern = pattern; 
					return false;			
				}
			}
			return true; 
		}
	},
	type_radio: function(field, arr) {
		var opts = $(field).getElements('input'); 
		var ret = false; 
		for(var i=0; i<opts.length; i++) {
			ret = opts[i].checked===true ? true : ret; 
		}
		this.params.pattern = arr.pattern; 
		this.params.responseHTML = arr.responseHTML; 
		return ret; 
	},
	type_checkbox: function(field, arr) {
		this.params.pattern = arr.pattern; 
		this.params.responseHTML = arr.responseHTML; 
		return field.checked; 
	},
	type_multi: function(field, arr) {
		this.params.pattern = arr.pattern; 
		this.params.responseHTML = arr.responseHTML; 
		return field.selectedIndex<0 ? false : true; 
	},
	type_select: function(field, arr) {
		this.params.pattern = arr.pattern; 
		this.params.responseHTML = arr.responseHTML; 
		return field.selectedIndex===0 ? false : true; 
	},
	invalid: function(field, arr) {
		alert(this.params.responseHTML); 
		field.addClass('error'); 
		this.labels.each(function(item,index){
				if(item.getProperty('for')==field.id) {
					item.addClass('error'); 
				}
			}); 
		field.ref = this; 
		if(this.params.pattern===this.params.patterns.VALID_EMAIL) { 
			field.value = ''; 
		}
		field.focus(); 
		return false; 
	},
	valid: function(field, arr) {
		field.removeClass('error'); 
		this.labels.each(function(item,index){
			item.removeClass('error'); 
			}); 
		return true; 
	}
});