// LiveValidation 1.3 (standalone version)
// Copyright (c) 2007-2008 Alec Hill (www.livevalidation.com)
// LiveValidation is licensed under the terms of the MIT License

/*********************************************** LiveValidation class ***********************************/

/**
 *	validates a form field in real-time based on validations you assign to it
 *	
 *	@var element {mixed} - either a dom element reference or the string id of the element to validate
 *	@var optionsObj {Object} - general options, see below for details
 *
 *	optionsObj properties:
 *							validMessage {String} 	- the message to show when the field passes validation
 *													  (DEFAULT: "Thankyou!")
 *							onValid {Function} 		- function to execute when field passes validation
 *													  (DEFAULT: function(){ this.insertMessage(this.createMessageSpan()); this.addFieldClass(); } )	
 *							onInvalid {Function} 	- function to execute when field fails validation
 *													  (DEFAULT: function(){ this.insertMessage(this.createMessageSpan()); this.addFieldClass(); })
 *							insertAfterWhatNode {Int} 	- position to insert default message
 *													  (DEFAULT: the field that is being validated)	
 *              onlyOnBlur {Boolean} - whether you want it to validate as you type or only on blur
 *                            (DEFAULT: false)
 *              wait {Integer} - the time you want it to pause from the last keystroke before it validates (ms)
 *                            (DEFAULT: 0)
 *              onlyOnSubmit {Boolean} - whether should be validated only when the form it belongs to is submitted
 *                            (DEFAULT: false)						
 */
var LiveValidation = function(element, optionsObj){
	this.initialize(element, optionsObj);
}

LiveValidation.VERSION = '1.3 standalone';

/** element types constants ****/

LiveValidation.TEXTAREA 		= 1;
LiveValidation.TEXT 			    = 2;
LiveValidation.PASSWORD 		= 3;
LiveValidation.CHECKBOX 		= 4;
LiveValidation.SELECT = 5;
LiveValidation.FILE = 6;

/****** Static methods *******/

/**
 *	pass an array of LiveValidation objects and it will validate all of them
 *	
 *	@var validations {Array} - an array of LiveValidation objects
 *	@return {Bool} - true if all passed validation, false if any fail						
 */
LiveValidation.massValidate = function(validations){
  var returnValue = true;
	for(var i = 0, len = validations.length; i < len; ++i ){
		var valid = validations[i].validate();
		if(returnValue) returnValue = valid;
	}
	return returnValue;
}

/****** prototype ******/

LiveValidation.prototype = {

	validClass: 'LV_valid',
	invalidClass: 'LV_invalid',
	messageClass: 'LV_validation_message',
	validFieldClass: 'LV_valid_field',
	invalidFieldClass: 'LV_invalid_field',

	/**
	 *	initialises all of the properties and events
	 *
	 * @var - Same as constructor above
	 */
	initialize: function(element, optionsObj){
	  var self = this;
	  if(!element) throw new Error("LiveValidation::initialize - No element reference or element id has been provided!");
		this.element = element.nodeName ? element : document.getElementById(element);
		if(!this.element) throw new Error("LiveValidation::initialize - No element with reference or id of '" + element + "' exists!");
	  // default properties that could not be initialised above
		this.validations = [];
	  this.elementType = this.getElementType();
	  this.form = this.element.form;
	  // options
		var options = optionsObj || {};
		this.validMessage = options.validMessage || 'Спасибо!';
		var node = options.insertAfterWhatNode || this.element;
		this.insertAfterWhatNode = node.nodeType ? node : document.getElementById(node);
	  this.onValid = options.onValid || function(){ this.insertMessage(this.createMessageSpan()); this.addFieldClass(); };
	  this.onInvalid = options.onInvalid || function(){ this.insertMessage(this.createMessageSpan()); this.addFieldClass(); };	
		this.onlyOnBlur =  options.onlyOnBlur || false;
		this.wait = options.wait || 0;
	  this.onlyOnSubmit = options.onlyOnSubmit || false;
	  // add to form if it has been provided	  
	  if(this.form){
		this.formObj = LiveValidationForm.getInstance(this.form);
		this.formObj.addField(this);
	  }
	  // events
	  // collect old events
	  this.oldOnFocus = this.element.onfocus || function(){};
	  this.oldOnBlur = this.element.onblur || function(){};
	  this.oldOnClick = this.element.onclick || function(){};
	  this.oldOnChange = this.element.onchange || function(){};
	  this.oldOnKeyup = this.element.onkeyup || function(){};
	  this.element.onfocus = function(e){ self.doOnFocus(e); return self.oldOnFocus.call(this, e); }
	  if(!this.onlyOnSubmit){
		switch(this.elementType){
		  case LiveValidation.CHECKBOX:
			this.element.onclick = function(e){ self.validate(); return self.oldOnClick.call(this, e); }
		  // let it run into the next to add a change event too
		  case LiveValidation.SELECT:
		  case LiveValidation.FILE:
			this.element.onchange = function(e){ self.validate(); return self.oldOnChange.call(this, e); }
			break;
		  default:
			if(!this.onlyOnBlur) this.element.onkeyup = function(e){ self.deferValidation(); return self.oldOnKeyup.call(this, e); }
			this.element.onblur = function(e){ self.doOnBlur(e); return self.oldOnBlur.call(this, e); }
		}
	  }
	},

	/**
	 *	destroys the instance's events (restoring previous ones) and removes it from any LiveValidationForms
	 */
	destroy: function(){
	  if(this.formObj){
		// remove the field from the LiveValidationForm
		this.formObj.removeField(this);
		// destroy the LiveValidationForm if no LiveValidation fields left in it
		this.formObj.destroy();
	  }
	  // remove events - set them back to the previous events
	  this.element.onfocus = this.oldOnFocus;
	  if(!this.onlyOnSubmit){
		switch(this.elementType){
		  case LiveValidation.CHECKBOX:
			this.element.onclick = this.oldOnClick;
		  // let it run into the next to add a change event too
		  case LiveValidation.SELECT:
		  case LiveValidation.FILE:
			this.element.onchange = this.oldOnChange;
			break;
		  default:
			if(!this.onlyOnBlur) this.element.onkeyup = this.oldOnKeyup;
			this.element.onblur = this.oldOnBlur;
		}
	  }
	  this.validations = [];
	  this.removeMessageAndFieldClass();
	},

	/**
	 *	adds a validation to perform to a LiveValidation object
	 *
	 *	@var validationFunction {Function} - validation function to be used (ie Validate.Presence )
	 *	@var validationParamsObj {Object} - parameters for doing the validation, if wanted or necessary
	 * @return {Object} - the LiveValidation object itself so that calls can be chained
	 */
	add: function(validationFunction, validationParamsObj){
	  this.validations.push( {type: validationFunction, params: validationParamsObj || {} } );
	  return this;
	},

	/**
	 *	removes a validation from a LiveValidation object - must have exactly the same arguments as used to add it 
	 *
	 *	@var validationFunction {Function} - validation function to be used (ie Validate.Presence )
	 *	@var validationParamsObj {Object} - parameters for doing the validation, if wanted or necessary
	 * @return {Object} - the LiveValidation object itself so that calls can be chained
	 */
	remove: function(validationFunction, validationParamsObj){
	  var found = false;
	  for( var i = 0, len = this.validations.length; i < len; i++ ){
			if( this.validations[i].type == validationFunction ){
				if (this.validations[i].params == validationParamsObj) {
					found = true;
					break;
				}
			}
	  }
	  if(found) this.validations.splice(i,1);
	  return this;
	},


	/**
	 * makes the validation wait the alotted time from the last keystroke 
	 */
	deferValidation: function(e){
	  if(this.wait >= 300) this.removeMessageAndFieldClass();
		var self = this;
	  if(this.timeout) clearTimeout(self.timeout);
	  this.timeout = setTimeout( function(){ self.validate() }, self.wait); 
	},

	/**
	 * sets the focused flag to false when field loses focus 
	 */
	doOnBlur: function(e){
	  this.focused = false;
	  this.validate(e);
	},

	/**
	 * sets the focused flag to true when field gains focus 
	 */
	doOnFocus: function(e){
	  this.focused = true;
	  this.removeMessageAndFieldClass();
	},

	/**
	 *	gets the type of element, to check whether it is compatible
	 *
	 *	@var validationFunction {Function} - validation function to be used (ie Validate.Presence )
	 *	@var validationParamsObj {Object} - parameters for doing the validation, if wanted or necessary
	 */
	getElementType: function(){
	  switch(true){
		case (this.element.nodeName.toUpperCase() == 'TEXTAREA'):
		return LiveValidation.TEXTAREA;
	  case (this.element.nodeName.toUpperCase() == 'INPUT' && this.element.type.toUpperCase() == 'TEXT'):
		return LiveValidation.TEXT;
	  case (this.element.nodeName.toUpperCase() == 'INPUT' && this.element.type.toUpperCase() == 'PASSWORD'):
		return LiveValidation.PASSWORD;
	  case (this.element.nodeName.toUpperCase() == 'INPUT' && this.element.type.toUpperCase() == 'CHECKBOX'):
		return LiveValidation.CHECKBOX;
	  case (this.element.nodeName.toUpperCase() == 'INPUT' && this.element.type.toUpperCase() == 'FILE'):
		return LiveValidation.FILE;
	  case (this.element.nodeName.toUpperCase() == 'SELECT'):
		return LiveValidation.SELECT;
		case (this.element.nodeName.toUpperCase() == 'INPUT'):
			throw new Error('LiveValidation::getElementType - Cannot use LiveValidation on an ' + this.element.type + ' input!');
		default:
			throw new Error('LiveValidation::getElementType - Element must be an input, select, or textarea!');
	  }
	},

	/**
	 *	loops through all the validations added to the LiveValidation object and checks them one by one
	 *
	 *	@var validationFunction {Function} - validation function to be used (ie Validate.Presence )
	 *	@var validationParamsObj {Object} - parameters for doing the validation, if wanted or necessary
	 * @return {Boolean} - whether the all the validations passed or if one failed
	 */
	doValidations: function(){
		this.validationFailed = false;
		for(var i = 0, len = this.validations.length; i < len; ++i){
			var validation = this.validations[i];
			switch(validation.type){
				case Validate.Presence:
				case Validate.Confirmation:
				case Validate.Acceptance:
					this.displayMessageWhenEmpty = true;
					this.validationFailed = !this.validateElement(validation.type, validation.params); 
					break;
				default:
					this.validationFailed = !this.validateElement(validation.type, validation.params);
					break;
			}
			if(this.validationFailed) return false;	
		}
		this.message = this.validMessage;
		return true;
	},

	/**
	 *	performs validation on the element and handles any error (validation or otherwise) it throws up
	 *
	 *	@var validationFunction {Function} - validation function to be used (ie Validate.Presence )
	 *	@var validationParamsObj {Object} - parameters for doing the validation, if wanted or necessary
	 * @return {Boolean} - whether the validation has passed or failed
	 */
	validateElement: function(validationFunction, validationParamsObj){
		var value = (this.elementType == LiveValidation.SELECT) ? this.element.options[this.element.selectedIndex].value : this.element.value;     
		if(validationFunction == Validate.Acceptance){
			if(this.elementType != LiveValidation.CHECKBOX) throw new Error('LiveValidation::validateElement - Element to validate acceptance must be a checkbox!');
			value = this.element.checked;
		}
		var isValid = true;
		try{    
			validationFunction(value, validationParamsObj);
		} catch(error) {
			if(error instanceof Validate.Error){
				if( value !== '' || (value === '' && this.displayMessageWhenEmpty) ){
					this.validationFailed = true;
					this.message = error.message;
					isValid = false;
				}
			}else{
				throw error;
			}
		}finally{
			return isValid;
		}
	},

	/**
	 *	makes it do the all the validations and fires off the onValid or onInvalid callbacks
	 *
	 * @return {Boolean} - whether the all the validations passed or if one failed
	 */
	validate: function(){
	  if(!this.element.disabled){
		var isValid = this.doValidations();
		if(isValid){
			this.onValid();
			return true;
		}else {
			this.onInvalid();
			return false;
		}
	  }else{
	  return true;
	}
	},

 /**
   *  enables the field
   *
   *  @return {LiveValidation} - the LiveValidation object for chaining
   */
  enable: function(){
	this.element.disabled = false;
	return this;
  },

  /**
   *  disables the field and removes any message and styles associated with the field
   *
   *  @return {LiveValidation} - the LiveValidation object for chaining
   */
  disable: function(){
	this.element.disabled = true;
	this.removeMessageAndFieldClass();
	return this;
  },

	/** Message insertion methods ****************************
	 * 
	 * These are only used in the onValid and onInvalid callback functions and so if you overide the default callbacks,
	 * you must either impliment your own functions to do whatever you want, or call some of these from them if you 
	 * want to keep some of the functionality
	 */

	/**
	 *	makes a span containg the passed or failed message
	 *
	 * @return {HTMLSpanObject} - a span element with the message in it
	 */
	createMessageSpan: function(){
		var span = document.createElement('span');
		var em = document.createElement('em');
		var textNode = document.createTextNode(this.message);
		em.appendChild(textNode);
		span.appendChild(em);
		return span;
	},

	/**
	 *	inserts the element containing the message in place of the element that already exists (if it does)
	 *
	 * @var elementToIsert {HTMLElementObject} - an element node to insert
	 */
	insertMessage: function(elementToInsert){
		this.removeMessage();
		if( (this.displayMessageWhenEmpty && (this.elementType == LiveValidation.CHECKBOX || this.element.value == ''))
		  || this.element.value != '' ){
			var className = this.validationFailed ? this.invalidClass : this.validClass;
			elementToInsert.className += ' ' + this.messageClass + ' ' + className;
			if(this.insertAfterWhatNode.nextSibling){
					this.insertAfterWhatNode.parentNode.insertBefore(elementToInsert, this.insertAfterWhatNode.nextSibling);
			}else{
					this.insertAfterWhatNode.parentNode.appendChild(elementToInsert);
			}
		}
	},


	/**
	 *	changes the class of the field based on whether it is valid or not
	 */
	addFieldClass: function(){
		this.removeFieldClass();
		if(!this.validationFailed){
			if(this.displayMessageWhenEmpty || this.element.value != ''){
				if(this.element.className.indexOf(this.validFieldClass) == -1) this.element.className += ' ' + this.validFieldClass;
			}
		}else{
			if(this.element.className.indexOf(this.invalidFieldClass) == -1) this.element.className += ' ' + this.invalidFieldClass;
		}
	},

	/**
	 *	removes the message element if it exists, so that the new message will replace it
	 */
	removeMessage: function(){
		var nextEl;
		var el = this.insertAfterWhatNode;
		while(el.nextSibling){
			if(el.nextSibling.nodeType === 1){
				nextEl = el.nextSibling;
				break;
			}
			el = el.nextSibling;
		}
		if(nextEl && nextEl.className.indexOf(this.messageClass) != -1) this.insertAfterWhatNode.parentNode.removeChild(nextEl);
	},

	/**
	 *	removes the class that has been applied to the field to indicte if valid or not
	 */
	removeFieldClass: function(){
	  if(this.element.className.indexOf(this.invalidFieldClass) != -1) this.element.className = this.element.className.split(this.invalidFieldClass).join('');
	  if(this.element.className.indexOf(this.validFieldClass) != -1) this.element.className = this.element.className.split(this.validFieldClass).join(' ');
	},

	/**
	 *	removes the message and the field class
	 */
	removeMessageAndFieldClass: function(){
	  this.removeMessage();
	  this.removeFieldClass();
	}

} // end of LiveValidation class

/*************************************** LiveValidationForm class ****************************************/
/**
 * This class is used internally by LiveValidation class to associate a LiveValidation field with a form it is icontained in one
 * 
 * It will therefore not really ever be needed to be used directly by the developer, unless they want to associate a LiveValidation 
 * field with a form that it is not a child of
 */

/**
   *	handles validation of LiveValidation fields belonging to this form on its submittal
   *	
   *	@var element {HTMLFormElement} - a dom element reference to the form to turn into a LiveValidationForm
   */
var LiveValidationForm = function(element){
  this.initialize(element);
}

/**
 * namespace to hold instances
 */
LiveValidationForm.instances = {};

/**
   *	gets the instance of the LiveValidationForm if it has already been made or creates it if it doesnt exist
   *	
   *	@var element {HTMLFormElement} - a dom element reference to a form
   */
LiveValidationForm.getInstance = function(element){
  var rand = Math.random() * Math.random();
  if(!element.id) element.id = 'formId_' + rand.toString().replace(/\./, '') + new Date().valueOf();
  if(!LiveValidationForm.instances[element.id]) LiveValidationForm.instances[element.id] = new LiveValidationForm(element);
  return LiveValidationForm.instances[element.id];
}

LiveValidationForm.prototype = {

  /**
   *	constructor for LiveValidationForm - handles validation of LiveValidation fields belonging to this form on its submittal
   *	
   *	@var element {HTMLFormElement} - a dom element reference to the form to turn into a LiveValidationForm
   */
  initialize: function(element){
	this.name = element.id;
	this.element = element;
	this.fields = [];
	// preserve the old onsubmit event
	this.oldOnSubmit = this.element.onsubmit || function(){};
	var self = this;
	this.element.onsubmit = function(e){
	  return (LiveValidation.massValidate(self.fields)) ? self.oldOnSubmit.call(this, e || window.event) !== false : false;
	}
  },

  /**
   *	adds a LiveValidation field to the forms fields array
   *	
   *	@var element {LiveValidation} - a LiveValidation object
   */
  addField: function(newField){
	this.fields.push(newField);
  },

  /**
   *	removes a LiveValidation field from the forms fields array
   *	
   *	@var victim {LiveValidation} - a LiveValidation object
   */
  removeField: function(victim){
	var victimless = [];
	for( var i = 0, len = this.fields.length; i < len; i++){
		if(this.fields[i] !== victim) victimless.push(this.fields[i]);
	}
	this.fields = victimless;
  },

  /**
   *	destroy this instance and its events
   *
   * @var force {Boolean} - whether to force the detruction even if there are fields still associated
   */
  destroy: function(force){
	// only destroy if has no fields and not being forced
	if (this.fields.length != 0 && !force) return false;
	// remove events - set back to previous events
	this.element.onsubmit = this.oldOnSubmit;
	// remove from the instances namespace
	LiveValidationForm.instances[this.name] = null;
	return true;
  }

}// end of LiveValidationForm prototype

/*************************************** Validate class ****************************************/
/**
 * This class contains all the methods needed for doing the actual validation itself
 *
 * All methods are static so that they can be used outside the context of a form field
 * as they could be useful for validating stuff anywhere you want really
 *
 * All of them will return true if the validation is successful, but will raise a ValidationError if
 * they fail, so that this can be caught and the message explaining the error can be accessed ( as just 
 * returning false would leave you a bit in the dark as to why it failed )
 *
 * Can use validation methods alone and wrap in a try..catch statement yourself if you want to access the failure
 * message and handle the error, or use the Validate::now method if you just want true or false
 */

var Validate = {

	/**
	 *	validates that the field has been filled in
	 *
	 *	@var value {mixed} - value to be checked
	 *	@var paramsObj {Object} - parameters for this particular validation, see below for details
	 *
	 *	paramsObj properties:
	 *							failureMessage {String} - the message to show when the field fails validation 
	 *													  (DEFAULT: "Can't be empty!")
	 */
	Presence: function(value, paramsObj){
		var paramsObj = paramsObj || {};
		var message = paramsObj.failureMessage || "Не должно быть пустым!";
		if(value === '' || value === null || value === undefined){ 
			Validate.fail(message);
		}
		return true;
	},

	/**
	 *	validates that the value is numeric, does not fall within a given range of numbers
	 *	
	 *	@var value {mixed} - value to be checked
	 *	@var paramsObj {Object} - parameters for this particular validation, see below for details
	 *
	 *	paramsObj properties:
	 *							notANumberMessage {String} - the message to show when the validation fails when value is not a number
	 *													  	  (DEFAULT: "Must be a number!")
	 *							notAnIntegerMessage {String} - the message to show when the validation fails when value is not an integer
	 *													  	  (DEFAULT: "Must be a number!")
	 *							wrongNumberMessage {String} - the message to show when the validation fails when is param is used
	 *													  	  (DEFAULT: "Must be {is}!")
	 *							tooLowMessage {String} 		- the message to show when the validation fails when minimum param is used
	 *													  	  (DEFAULT: "Must not be less than {minimum}!")
	 *							tooHighMessage {String} 	- the message to show when the validation fails when maximum param is used
	 *													  	  (DEFAULT: "Must not be more than {maximum}!")
	 *							is {Int} 					- the length must be this long 
	 *							minimum {Int} 				- the minimum length allowed
	 *							maximum {Int} 				- the maximum length allowed
	 *                         onlyInteger {Boolean} - if true will only allow integers to be valid
	 *                                                             (DEFAULT: false)
	 *
	 *  NB. can be checked if it is within a range by specifying both a minimum and a maximum
	 *  NB. will evaluate numbers represented in scientific form (ie 2e10) correctly as numbers				
	 */
	Numericality: function(value, paramsObj){
		var suppliedValue = value;
		var value = Number(value);
		var paramsObj = paramsObj || {};
		var minimum = ((paramsObj.minimum) || (paramsObj.minimum == 0)) ? paramsObj.minimum : null;;
		var maximum = ((paramsObj.maximum) || (paramsObj.maximum == 0)) ? paramsObj.maximum : null;
		var is = ((paramsObj.is) || (paramsObj.is == 0)) ? paramsObj.is : null;
		var notANumberMessage = paramsObj.notANumberMessage || "Должно быть числом!";
		var notAnIntegerMessage = paramsObj.notAnIntegerMessage || "Должно быть числом!";
		var wrongNumberMessage = paramsObj.wrongNumberMessage || "Должно быть " + is + "!";
		var tooLowMessage = paramsObj.tooLowMessage || "Не менее " + minimum + " символов!";
		var tooHighMessage = paramsObj.tooHighMessage || "Не более " + maximum + " символов!";
		if (!isFinite(value)) Validate.fail(notANumberMessage);
		if (paramsObj.onlyInteger && (/\.0+$|\.$/.test(String(suppliedValue))  || value != parseInt(value)) ) Validate.fail(notAnIntegerMessage);
		switch(true){
			case (is !== null):
				if( value != Number(is) ) Validate.fail(wrongNumberMessage);
				break;
			case (minimum !== null && maximum !== null):
				Validate.Numericality(value, {tooLowMessage: tooLowMessage, minimum: minimum});
				Validate.Numericality(value, {tooHighMessage: tooHighMessage, maximum: maximum});
				break;
			case (minimum !== null):
				if( value < Number(minimum) ) Validate.fail(tooLowMessage);
				break;
			case (maximum !== null):
				if( value > Number(maximum) ) Validate.fail(tooHighMessage);
				break;
		}
		return true;
	},

	/**
	 *	validates against a RegExp pattern
	 *	
	 *	@var value {mixed} - value to be checked
	 *	@var paramsObj {Object} - parameters for this particular validation, see below for details
	 *
	 *	paramsObj properties:
	 *							failureMessage {String} - the message to show when the field fails validation
	 *													  (DEFAULT: "Not valid!")
	 *							pattern {RegExp} 		- the regular expression pattern
	 *													  (DEFAULT: /./)
	 *             negate {Boolean} - if set to true, will validate true if the pattern is not matched
   *                           (DEFAULT: false)
	 *
	 *  NB. will return true for an empty string, to allow for non-required, empty fields to validate.
	 *		If you do not want this to be the case then you must either add a LiveValidation.PRESENCE validation
	 *		or build it into the regular expression pattern
	 */
	Format: function(value, paramsObj){
	  var value = String(value);
		var paramsObj = paramsObj || {};
		var message = paramsObj.failureMessage || "Не верно!";
	  var pattern = paramsObj.pattern || /./;
	  var negate = paramsObj.negate || false;
	  if(!negate && !pattern.test(value)) Validate.fail(message); // normal
	  if(negate && pattern.test(value)) Validate.fail(message); // negated
		return true;
	},

	/**
	 *	validates that the field contains a valid email address
	 *	
	 *	@var value {mixed} - value to be checked
	 *	@var paramsObj {Object} - parameters for this particular validation, see below for details
	 *
	 *	paramsObj properties:
	 *							failureMessage {String} - the message to show when the field fails validation
	 *													  (DEFAULT: "Must be a number!" or "Must be an integer!")
	 */
	Email: function(value, paramsObj){
		var paramsObj = paramsObj || {};
		var message = paramsObj.failureMessage || "Должен быть правильный E-mail!";
		Validate.Format(value, { failureMessage: message, pattern: /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i } );
		return true;
	},

	/**
	 *	validates the length of the value
	 *	
	 *	@var value {mixed} - value to be checked
	 *	@var paramsObj {Object} - parameters for this particular validation, see below for details
	 *
	 *	paramsObj properties:
	 *							wrongLengthMessage {String} - the message to show when the fails when is param is used
	 *													  	  (DEFAULT: "Must be {is} characters long!")
	 *							tooShortMessage {String} 	- the message to show when the fails when minimum param is used
	 *													  	  (DEFAULT: "Must not be less than {minimum} characters long!")
	 *							tooLongMessage {String} 	- the message to show when the fails when maximum param is used
	 *													  	  (DEFAULT: "Must not be more than {maximum} characters long!")
	 *							is {Int} 					- the length must be this long 
	 *							minimum {Int} 				- the minimum length allowed
	 *							maximum {Int} 				- the maximum length allowed
	 *
	 *  NB. can be checked if it is within a range by specifying both a minimum and a maximum				
	 */
	Length: function(value, paramsObj){
		var value = String(value);
		var paramsObj = paramsObj || {};
		var minimum = ((paramsObj.minimum) || (paramsObj.minimum == 0)) ? paramsObj.minimum : null;
		var maximum = ((paramsObj.maximum) || (paramsObj.maximum == 0)) ? paramsObj.maximum : null;
		var is = ((paramsObj.is) || (paramsObj.is == 0)) ? paramsObj.is : null;
		var wrongLengthMessage = paramsObj.wrongLengthMessage || "Необходимое количество символов " + is + "!";
		var tooShortMessage = paramsObj.tooShortMessage || "Не менее " + minimum + " символов!";
		var tooLongMessage = paramsObj.tooLongMessage || "Не более " + maximum + " символов!";
		switch(true){
			case (is !== null):
				if( value.length != Number(is) ) Validate.fail(wrongLengthMessage);
				break;
			case (minimum !== null && maximum !== null):
				Validate.Length(value, {tooShortMessage: tooShortMessage, minimum: minimum});
				Validate.Length(value, {tooLongMessage: tooLongMessage, maximum: maximum});
				break;
			case (minimum !== null):
				if( value.length < Number(minimum) ) Validate.fail(tooShortMessage);
				break;
			case (maximum !== null):
				if( value.length > Number(maximum) ) Validate.fail(tooLongMessage);
				break;
			default:
				throw new Error("Validate::Length - Length(s) to validate against must be provided!");
		}
		return true;
	},

	/**
	 *	validates that the value falls within a given set of values
	 *	
	 *	@var value {mixed} - value to be checked
	 *	@var paramsObj {Object} - parameters for this particular validation, see below for details
	 *
	 *	paramsObj properties:
	 *							failureMessage {String} - the message to show when the field fails validation
	 *													  (DEFAULT: "Must be included in the list!")
	 *							within {Array} 			- an array of values that the value should fall in 
	 *													  (DEFAULT: [])	
	 *							allowNull {Bool} 		- if true, and a null value is passed in, validates as true
	 *													  (DEFAULT: false)
	 *             partialMatch {Bool} 	- if true, will not only validate against the whole value to check but also if it is a substring of the value 
	 *													  (DEFAULT: false)
	 *             caseSensitive {Bool} - if false will compare strings case insensitively
	 *                          (DEFAULT: true)
	 *             negate {Bool} 		- if true, will validate that the value is not within the given set of values
	 *													  (DEFAULT: false)			
	 */
	Inclusion: function(value, paramsObj){
		var paramsObj = paramsObj || {};
		var message = paramsObj.failureMessage || "Должно входить в список!";
	  var caseSensitive = (paramsObj.caseSensitive === false) ? false : true;
		if(paramsObj.allowNull && value == null) return true;
	  if(!paramsObj.allowNull && value == null) Validate.fail(message);
		var within = paramsObj.within || [];
	  //if case insensitive, make all strings in the array lowercase, and the value too
	  if(!caseSensitive){ 
		var lowerWithin = [];
		for(var j = 0, length = within.length; j < length; ++j){
			var item = within[j];
		  if(typeof item == 'string') item = item.toLowerCase();
		  lowerWithin.push(item);
		}
		within = lowerWithin;
		if(typeof value == 'string') value = value.toLowerCase();
	  }
		var found = false;
		for(var i = 0, length = within.length; i < length; ++i){
		  if(within[i] == value) found = true;
		if(paramsObj.partialMatch){ 
		  if(value.indexOf(within[i]) != -1) found = true;
		}
		}
		if( (!paramsObj.negate && !found) || (paramsObj.negate && found) ) Validate.fail(message);
		return true;
	},

	/**
	 *	validates that the value does not fall within a given set of values
	 *	
	 *	@var value {mixed} - value to be checked
	 *	@var paramsObj {Object} - parameters for this particular validation, see below for details
	 *
	 *	paramsObj properties:
	 *							failureMessage {String} - the message to show when the field fails validation
	 *													  (DEFAULT: "Must not be included in the list!")
	 *							within {Array} 			- an array of values that the value should not fall in 
	 *													  (DEFAULT: [])
	 *							allowNull {Bool} 		- if true, and a null value is passed in, validates as true
	 *													  (DEFAULT: false)
	 *             partialMatch {Bool} 	- if true, will not only validate against the whole value to check but also if it is a substring of the value 
	 *													  (DEFAULT: false)
	 *             caseSensitive {Bool} - if false will compare strings case insensitively
	 *                          (DEFAULT: true)			
	 */
	Exclusion: function(value, paramsObj){
	  var paramsObj = paramsObj || {};
		paramsObj.failureMessage = paramsObj.failureMessage || "Не должно включаться в список!";
	  paramsObj.negate = true;
		Validate.Inclusion(value, paramsObj);
	  return true;
	},

	/**
	 *	validates that the value matches that in another field
	 *	
	 *	@var value {mixed} - value to be checked
	 *	@var paramsObj {Object} - parameters for this particular validation, see below for details
	 *
	 *	paramsObj properties:
	 *							failureMessage {String} - the message to show when the field fails validation
	 *													  (DEFAULT: "Does not match!")
	 *							match {String} 			- id of the field that this one should match						
	 */
	Confirmation: function(value, paramsObj){
		if(!paramsObj.match) throw new Error("Validate::Confirmation - Error validating confirmation: Id of element to match must be provided!");
		var paramsObj = paramsObj || {};
		var message = paramsObj.failureMessage || "Значения не совпадают!";
		var match = paramsObj.match.nodeName ? paramsObj.match : document.getElementById(paramsObj.match);
		if(!match) throw new Error("Validate::Confirmation - There is no reference with name of, or element with id of '" + paramsObj.match + "'!");
		if(value != match.value){ 
			Validate.fail(message);
		}
		return true;
	},

	/**
	 *	validates that the value is true (for use primarily in detemining if a checkbox has been checked)
	 *	
	 *	@var value {mixed} - value to be checked if true or not (usually a boolean from the checked value of a checkbox)
	 *	@var paramsObj {Object} - parameters for this particular validation, see below for details
	 *
	 *	paramsObj properties:
	 *							failureMessage {String} - the message to show when the field fails validation 
	 *													  (DEFAULT: "Must be accepted!")
	 */
	Acceptance: function(value, paramsObj){
		var paramsObj = paramsObj || {};
		var message = paramsObj.failureMessage || "Должно быть подтверждено!";
		if(!value){ 
			Validate.fail(message);
		}
		return true;
	},

	 /**
	 *	validates against a custom function that returns true or false (or throws a Validate.Error) when passed the value
	 *	
	 *	@var value {mixed} - value to be checked
	 *	@var paramsObj {Object} - parameters for this particular validation, see below for details
	 *
	 *	paramsObj properties:
	 *							failureMessage {String} - the message to show when the field fails validation
	 *													  (DEFAULT: "Not valid!")
	 *							against {Function} 			- a function that will take the value and object of arguments and return true or false 
	 *													  (DEFAULT: function(){ return true; })
	 *							args {Object} 		- an object of named arguments that will be passed to the custom function so are accessible through this object within it 
	 *													  (DEFAULT: {})
	 */
	Custom: function(value, paramsObj){
		var paramsObj = paramsObj || {};
		var against = paramsObj.against || function(){ return true; };
		var args = paramsObj.args || {};
		var message = paramsObj.failureMessage || "Не верно!";
		if(!against(value, args)) Validate.fail(message);
		return true;
	  },

	/**
	 *	validates whatever it is you pass in, and handles the validation error for you so it gives a nice true or false reply
	 *
	 *	@var validationFunction {Function} - validation function to be used (ie Validation.validatePresence )
	 *	@var value {mixed} - value to be checked if true or not (usually a boolean from the checked value of a checkbox)
	 *	@var validationParamsObj {Object} - parameters for doing the validation, if wanted or necessary
	 */
	now: function(validationFunction, value, validationParamsObj){
		if(!validationFunction) throw new Error("Validate::now - Validation function must be provided!");
		var isValid = true;
		try{    
			validationFunction(value, validationParamsObj || {});
		} catch(error) {
			if(error instanceof Validate.Error){
				isValid =  false;
			}else{
				throw error;
			}
		}finally{ 
			return isValid 
		}
	},

	/**
	 * shortcut for failing throwing a validation error
	 *
	 *	@var errorMessage {String} - message to display
	 */
	fail: function(errorMessage){
			throw new Validate.Error(errorMessage);
	},

	Error: function(errorMessage){
		this.message = errorMessage;
		this.name = 'ValidationError';
	}

}