// Some regexes stolen blatently from http://tetlaw.id.au/upload/dev/validation/validation.js

var filters = {
	requiredField: function(v) {
		var item = v.length ? v[0] : v
		var signature = item.tagName.toUpperCase() + (item.type ? "." + item.type.toUpperCase() : "")
		switch(signature) {
			case 'INPUT.TEXT':
			case 'INPUT.PASSWORD':
			case 'TEXTAREA.TEXTAREA':
				return /./.test(trim(v.value)) ? "" : "Field is empty."
			case 'INPUT.RADIO':
			case 'INPUT.CHECKBOX':
				var collection = document.forms[0][v.name]
				// I check for both .checked and .selectedIndex to cover for freak situations like the event list, where
				//	the hidden field is always a checkbox while the visible one is a drop-down
				for(var j = 0; j < collection.length; j++) { if(collection[j].checked | collection[j].selectedIndex > -1) { return "" } }
				return "Please select " + (signature == "INPUT.CHECKBOX" ? "at least one" : "an") + " option."
			case 'SELECT':
			case 'OPTION':
				return /./.test(trim(v[v.selectedIndex].value)) ? "" : "Please select an option."
		}
		return ""
	},
	numericField:  function(v) { return trim(v.value) == "" || !isNaN(trim(v.value)) ? "" : "Not a valid number." },
	digitField:    function(v) { return trim(v.value) == "" || !/[^\d]/.test(clear_space(v.value)) ? "" : "Not a valid number." },
	alphaField:    function(v) { return trim(v.value) == "" || /^[a-zA-Z]+$/.test(clear_space(v.value)) ? "" : "Contains non-letter characters." },
	alphanumField: function(v) { return trim(v.value) == "" || !/\W/.test(clear_space(v.value)) ? "" : "Contains non-alphanumeric characters." },
	//emailField:  function(v) { return trim(v.value) == "" || /\w{1,}[@][\w\-]{1,}([.]([\w\-]{1,})){1,3}$/.test(trim(v.value)) ? "" : "Not a valid email address." },
	//emailField:  function(v) { return trim(v.value) == "" || /^([0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]*\.)+[a-zA-Z]{2,9})$/.test(trim(v.value)) ? "" : "Not a valid email address." },
	emailField:    function(v) { return trim(v.value) == "" || /^([0-9a-zA-Z-!\'%&\*\+\/=\?^`{}\|$~]([-.!\'%&\*\+\/=\?^`{}\|$~\w]*[0-9a-zA-Z\-!\'%&\*\+\/=\?^`{}\|$~])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]*\.)+[a-zA-Z]{2,9})$/.test(trim(v.value)) ? "" : "Not a valid email address." },
	zipField:      function(v) { return trim(v.value) == "" || /^\d\d\d\d\d(-?)(\d\d\d\d)?$/.test(clear_space(v.value)) ? "" : "Not a valid US ZIP code." },
	//phoneField:  function(v) { return trim(v.value) == "" || /^[\d]{10,11}$/.test(strip_non_digits(v.value)) ? "" : "Not a valid phone number." }
	phoneField:    function(v) { return trim(v.value) == "" || /^((\+\d{1,3}(-| )?\(?\d\)?(-| )?\d{1,3})|(\(?\d{2,3}\)?))(-| )?(\d{3,4})(-| )?(\d{4})(( x| ext)\d{1,5}){0,1}$/.test(trim(v.value)) ? "" : "Not a valid phone number." },
	eventField:    function(v) { return this.requiredField(v) }
}

	
validateFields = function(elements) {
	// if we're not really submitting (i.e. we're just refreshing fields), don't run the checks
	if(!document.__is_submitting) { return true }
	
	var content = document.getElementById("content")
	
	errorMessage = ""

	//var elements = specificElement ? [specificElement] : document.forms[0].elements
	var hitElements = new Object()
	for(var i = 0; i < elements.length; i++) {
		if(hitElements[elements[i].name]) { continue }
		
		var parentElement = document.getElementById(elements[i].name + "_Row")
		
		// clear out any old error nodes
		if(parentElement) {
			var errorMessages = children_by_class(parentElement, "errorMessage")
			for(var j = errorMessages.length - 1; j >= 0; j--) { errorMessages[j].parentNode.removeChild(errorMessages[j]) }
		}
	
		if(/\s+notesEventField\s+/.test(" " + elements[i].className + " ")) { continue }

		if(parentElement) parentElement.className = parentElement.className.replace(" missingRequiredField", "")
		if(parentElement) parentElement.className = parentElement.className.replace(" textFieldError", "")
		var classes = elements[i].className.split(/\s/)
		for(filterClass in filters) {
			if(classes.indexOf(filterClass) > -1) {
				var result = filters[filterClass](elements[i])
				if(result != "") {
					errorMessage += elements[i].title + ": " + result + "\n"
					if(parentElement) {
						var itemError = document.createElement('div')
						itemError.className = "errorMessage"
						itemError.style.visibility = "hidden"
						
						itemError.style.opacity = 0
						itemError.style.filter = "alpha(opacity=0)"
						
						itemError.appendChild(document.createElement('span'))
						itemError.firstChild.appendChild(document.createTextNode(result))
						last_real_element(parentElement.childNodes).appendChild(itemError)
						//parentElement.appendChild(itemError)
						
						if(["TEXT", "TEXTAREA", "PASSWORD"].indexOf(elements[i].type.toUpperCase()) > -1) {
							itemError.style.width = elements[i].offsetWidth > 150 ? elements[i].offsetWidth : 150
							itemError.className += " textFieldError"
							parentElement.className += " textFieldError"
						} else {
							itemError.style.width = itemError.firstChild.offsetWidth + 20
						}
						
						itemError.style.visibility = "visible"
						new Effect.Opacity(itemError, {
							duration: 1, 
							transition: Effect.Transitions.linear, 
							from: 0, to: 1 }
						)

						parentElement.className += " missingRequiredField"
					}
					break
				}
			}
		}
		hitElements[elements[i].name] = true
	}

	document.__is_submitting = false
	if(errorMessage != "") { alert(errorMessage); return false }

	if(document.getElementById("submitButton")) {
		document.getElementById("submitButton").disabled = true
		document.getElementById("submitButton").value = "Please wait..."
	}
	
	return true
}

trim = function(v) { return v.replace(/^\s+/, "").replace(/\s+$/, "") }
clear_space = function(v) { return v.replace(/\s/g, "") }
strip_non_digits = function(v) { return v.replace(/[^\d]/g, "") }
last_real_element = function(v) { for(var i = v.length - 1; i >= 0; i--) { if(v[i].nodeType == 1) { return v[i] } } return null }

// modified from http://www.webxpertz.net/forums/showthread.php?t=30555
function children_by_class(container, className) {
	var arr   = []
	var reg   = new RegExp("\\b" + className + "\\b")
	container = document.getElementById(container) || container || document
	var all   = container.all || container.getElementsByTagName("*")

	var elm
	for(index = 0; index < all.length; index++) {
		elm = all[index]
		if(reg.test(elm.className)) { arr[arr.length] = elm }
	}
	return arr
}

// Firefox has this method already, but IE seems to not, so I'll patch in my own iff it doesn't exist
if(!Array.prototype.indexOf) { Array.prototype.indexOf = function(v) { for(var i = 0; i < this.length; i++) if(this[i] == v) return i; return -1 } }