/**
 * h5Validate
 * 
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * Developed under the sponsorship of RootMusic, and Zumba Fitness
 */

/*global jQuery, window, console */
(function ($) {
	'use strict';
	var console = window.console || function () {},
		h5 = { // Public API
			defaults : {
				debug: false,

				RODom: false,

				// HTML5-compatible validation pattern library that can be extended and/or overriden.
				patternLibrary : { //** TODO: Test the new regex patterns. Should I apply these to the new input types?
					// **TODO: password
					phone: /([\+][0-9]{1,3}([ \.\-])?)?([\(][0-9]{1,6}[\)])?([0-9A-Za-z \.\-]{1,32})(([A-Za-z \:]{1,11})?[0-9]{1,4}?)/,

					// Shamelessly lifted from Scott Gonzalez via the Bassistance Validation plugin http://projects.scottsplayground.com/email_address_validation/
					email: /((([a-zA-Z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-zA-Z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-zA-Z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-zA-Z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-zA-Z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-zA-Z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-zA-Z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-zA-Z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-zA-Z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-zA-Z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?/,

					// Shamelessly lifted from Scott Gonzalez via the Bassistance Validation plugin http://projects.scottsplayground.com/iri/
					url: /(https?|ftp):\/\/(((([a-zA-Z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:)*@)?(((\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5]))|((([a-zA-Z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-zA-Z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-zA-Z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-zA-Z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-zA-Z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-zA-Z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-zA-Z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-zA-Z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?)(:\d*)?)(\/((([a-zA-Z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)+(\/(([a-zA-Z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)*)*)?)?(\?((([a-zA-Z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|[\uE000-\uF8FF]|\/|\?)*)?(\#((([a-zA-Z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|\/|\?)*)?/,

					// Number, including positive, negative, and floating decimal. Credit: bassistance
					number: /-?(?:\d+|\d{1,3}(?:,\d{3})+)?(?:\.\d+)?/,

					// Date in ISO format. Credit: bassistance
					dateISO: /\d{4}[\/\-]\d{1,2}[\/\-]\d{1,2}/,

					alpha: /[a-zA-Z]+/,
					alphaNumeric: /\w+/,
					integer: /-?\d+/
				},

				// The prefix to use for dynamically-created class names.
				classPrefix: 'h5-',

				errorClass: 'ui-state-error', // No prefix for these.
				validClass: 'ui-state-valid', // "
				activeClass: 'active', // Prefix will get prepended.
				requiredClass: 'required',
				requiredAttribute: 'required',
				patternAttribute: 'pattern',

				// Attribute which stores the ID of the error container element (without the hash).
				errorAttribute: 'data-h5-errorid',

				// Events API
				customEvents: {
					'validate': true
				},

				// Setup KB event delegation.
				kbSelectors: ':input:not(:button):not(:disabled):not(.novalidate)',
				focusout: true,
				focusin: false,
				change: true,
				keyup: false,
				activeKeyup: true,

				// Setup mouse event delegation.
				mSelectors: '[type="range"]:not(:disabled):not(.novalidate), :radio:not(:disabled):not(.novalidate), :checkbox:not(:disabled):not(.novalidate), select:not(:disabled):not(.novalidate), option:not(:disabled):not(.novalidate)',
				click: true,

				// What do we name the required .data variable?
				requiredVar: 'h5-required',

				// What do we name the pattern .data variable?
				patternVar: 'h5-pattern',
				stripMarkup: true,

				// Run submit related checks and prevent form submission if any fields are invalid?
				submit: true,

				// Move focus to the first invalid field on submit?
				focusFirstInvalidElementOnSubmit: true,

				// When submitting, validate elements that haven't been validated yet?
				validateOnSubmit: true,

				// Callback stubs
				invalidCallback: function () {},
				validCallback: function () {},

				// Elements to validate with allValid (only validating visible elements)
				allValidSelectors: ':input:visible:not(:button):not(:disabled):not(.novalidate)',

				// Mark field invalid.
				// ** TODO: Highlight labels
				// ** TODO: Implement setCustomValidity as per the spec:
				// http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-controls-and-forms.html#dom-cva-setcustomvalidity
				markInvalid: function markInvalid(options) {
					var $element = $(options.element),
						$errorID = $(options.errorID);
					$element.addClass(options.errorClass).removeClass(options.validClass);

					// User needs help. Enable active validation.
					$element.addClass(options.settings.activeClass);

					if ($errorID.length) { // These ifs are technically not needed, but improve server-side performance 
						if ($element.attr('title')) {
							$errorID.text($element.attr('title'));
						}
						$errorID.show();
					}
					$element.data('valid', false);
					options.settings.invalidCallback.call(options.element, options.validity);
					return $element;
				},

				// Mark field valid.
				markValid: function markValid(options) {
					var $element = $(options.element),
						$errorID = $(options.errorID);

					$element.addClass(options.validClass).removeClass(options.errorClass);
					if ($errorID.length) {
						$errorID.hide();
					}
					$element.data('valid', true);
					options.settings.validCallback.call(options.element, options.validity);
					return $element;
				},

				// Unmark field
				unmark: function unmark(options) {
					var $element = $(options.element);
					$element.removeClass(options.errorClass).removeClass(options.validClass);
					$element.form.find("#" + options.element.id).removeClass(options.errorClass).removeClass(options.validClass);
					return $element;
				}
			}
		},

		// Aliases
		defaults = h5.defaults,
		patternLibrary = defaults.patternLibrary,

		createValidity = function createValidity(validity) {
			return $.extend({
				customError: validity.customError || false,
				patternMismatch: validity.patternMismatch || false,
				rangeOverflow: validity.rangeOverflow || false,
				rangeUnderflow: validity.rangeUnderflow || false,
				stepMismatch: validity.stepMismatch || false,
				tooLong: validity.tooLong || false,
				typeMismatch: validity.typeMismatch || false,
				valid: validity.valid || true,
				valueMissing: validity.valueMissing || false
			}, validity);
		},

		methods = {
			/**
			 * Check the validity of the current field
			 * @param  {object}  settings   instance settings
			 * @param  {object}  options
			 *			.revalidate - trigger validation function first?
			 * @return {Boolean}
			 */
			isValid: function (settings, options) {
				var $this = $(this);

				options = (settings && options) || {};

				// Revalidate defaults to true
				if (options.revalidate !== false) {
					$this.trigger('validate');
				}

				return $this.data('valid'); // get the validation result
			},
			allValid: function (config, options) {
				var valid = true,
					formValidity = [],
					$this = $(this),
					$allFields,
					$filteredFields,
					radioNames = [],
					getValidity = function getValidity(e, data) {
						data.e = e;
						formValidity.push(data);
					},
					settings = $.extend({}, config, options); // allow options to override settings

				options = options || {};

				$this.trigger('formValidate', {settings: $.extend(true, {}, settings)});

				// Make sure we're not triggering handlers more than we need to.
				$this.undelegate(settings.allValidSelectors,
					'.allValid', getValidity);
				$this.delegate(settings.allValidSelectors,
					'validated.allValid', getValidity);

				$allFields = $this.find(settings.allValidSelectors);

				// Filter radio buttons with the same name and keep only one,
				// since they will be checked as a group by isValid()
				$filteredFields = $allFields.filter(function(index) {
					var name;

					if(this.tagName === "INPUT"
						&& this.type === "radio") {
						name = this.name;
						if(radioNames[name] === true) {
							return false;
						}
						radioNames[name] = true;
					}
					return true;
				});

				$filteredFields.each(function () {
					var $this = $(this);
					valid = $this.h5Validate('isValid', options) && valid;
				});

				$this.trigger('formValidated', {valid: valid, elements: formValidity});
				return valid;
			},
			validate: function (settings) {
				// Get the HTML5 pattern attribute if it exists.
				// ** TODO: If a pattern class exists, grab the pattern from the patternLibrary, but the pattern attrib should override that value.
				var $this = $(this),
					pattern = $this.filter('[pattern]')[0] ? $this.attr('pattern') : false,

					// The pattern attribute must match the whole value, not just a subset:
					// "...as if it implied a ^(?: at the start of the pattern and a )$ at the end."
					re = new RegExp('^(?:' + pattern + ')$'),
					$radiosWithSameName = null,
					value = ($this.is('[type=checkbox]')) ?
							$this.is(':checked') : ($this.is('[type=radio]') ?
								// Cache all radio buttons (in the same form) with the same name as this one
								($radiosWithSameName = $this.parents('form')
									// **TODO: escape the radio buttons' name before using it in the jQuery selector
									.find('input[name="' + $this.attr('name') + '"]'))
									.filter(':checked')
									.length > 0 : $this.val()),
					errorClass = settings.errorClass,
					validClass = settings.validClass,
					errorIDbare = $this.attr(settings.errorAttribute) || false, // Get the ID of the error element.
					errorID = errorIDbare ? '#' + errorIDbare.replace(/(:|\.|\[|\])/g,'\\$1') : false, // Add the hash for convenience. This is done in two steps to avoid two attribute lookups.
					required = false,
					validity = createValidity({element: this, valid: true}),
					$checkRequired = $('<input required>'),
					maxlength;

				/*	If the required attribute exists, set it required to true, unless it's set 'false'.
				*	This is a minor deviation from the spec, but it seems some browsers have falsey 
				*	required values if the attribute is empty (should be true). The more conformant 
				*	version of this failed sanity checking in the browser environment.
				*	This plugin is meant to be practical, not ideologically married to the spec.
				*/
				// Feature fork
				if ($checkRequired.filter('[required]') && $checkRequired.filter('[required]').length) {
					required = ($this.filter('[required]').length && $this.attr('required') !== 'false');
				} else {
					required = ($this.attr('required') !== undefined);
				}

				if (settings.debug && window.console) {
					console.log('Validate called on "' + value + '" with regex "' + re + '". Required: ' + required); // **DEBUG
					console.log('Regex test: ' + re.test(value) + ', Pattern: ' + pattern); // **DEBUG
				}

				maxlength = parseInt($this.attr('maxlength'), 10);
				if (!isNaN(maxlength) && value.length > maxlength) {
						validity.valid = false;	
						validity.tooLong = true;
				}

				if (required && !value) {
					validity.valid = false;
					validity.valueMissing = true;
				} else if (pattern && !re.test(value) && value) {
					validity.valid = false;
					validity.patternMismatch = true;
				} else {
					if (!settings.RODom) {
						settings.markValid({
							element: this,
							validity: validity,
							errorClass: errorClass,
							validClass: validClass,
							errorID: errorID,
							settings: settings
						});
					}
				}

				if (!validity.valid) {
					if (!settings.RODom) {
						settings.markInvalid({
							element: this,
							validity: validity,
							errorClass: errorClass,
							validClass: validClass,
							errorID: errorID,
							settings: settings
						});
					}
				}
				$this.trigger('validated', validity);

				// If it's a radio button, also validate the other radio buttons with the same name
				// (while making sure the call is not recursive)
				if($radiosWithSameName !== null
					&& settings.alreadyCheckingRelatedRadioButtons !== true) {

					settings.alreadyCheckingRelatedRadioButtons = true;

					$radiosWithSameName
						.not($this)
						.trigger('validate');

					settings.alreadyCheckingRelatedRadioButtons = false;

				}
			},

			/**
			 * Take the event preferences and delegate the events to selected
			 * objects.
			 * 
			 * @param {object} eventFlags The object containing event flags.
			 * 
			 * @returns {element} The passed element (for method chaining).
			 */
			delegateEvents: function (selectors, eventFlags, element, settings) {
				var events = {},
					key = 0,
					validate = function () {
						settings.validate.call(this, settings);
					};
				$.each(eventFlags, function (key, value) {
					if (value) {
						events[key] = key;
					}
				});
				// key = 0;
				for (key in events) {
					if (events.hasOwnProperty(key)) {
						$(element).delegate(selectors, events[key] + '.h5Validate', validate);
					}
				}
				return element;
			},
			/**
			 * Prepare for event delegation.
			 * 
			 * @param {object} settings The full plugin state, including
			 * options. 
			 * 
			 * @returns {object} jQuery object for chaining.
			 */
			bindDelegation: function (settings) {
				var $this = $(this),
					$forms;
				// Attach patterns from the library to elements.
				// **TODO: pattern / validation method matching should
				// take place inside the validate action.
				$.each(patternLibrary, function (key, value) {
					var pattern = value.toString();
					pattern = pattern.substring(1, pattern.length - 1);
					$('.' + settings.classPrefix + key).attr('pattern', pattern);
				});

				$forms = $this.filter('form')
						.add($this.find('form'))
						.add($this.parents('form'));

				$forms
					.attr('novalidate', 'novalidate')
					.submit(checkValidityOnSubmitHandler);
					
				$forms.find("input[formnovalidate][type='submit']").click(function(){
					$(this).closest("form").unbind('submit', checkValidityOnSubmitHandler);
				});

				return this.each(function () {
					var kbEvents = {
							focusout: settings.focusout,
							focusin: settings.focusin,
							change: settings.change,
							keyup: settings.keyup
						},
						mEvents = {
							click: settings.click
						},
						activeEvents = {
							keyup: settings.activeKeyup
						};

					settings.delegateEvents(':input', settings.customEvents, this, settings);
					settings.delegateEvents(settings.kbSelectors, kbEvents, this, settings);
					settings.delegateEvents(settings.mSelectors, mEvents, this, settings);
					settings.delegateEvents(settings.activeClassSelector, activeEvents, this, settings);
					settings.delegateEvents('textarea[maxlength]', {keyup: true}, this, settings);
				});
			}
		},

		/**
		 * Event handler for the form submit event.
		 * When settings.submit is enabled:
		 *  - prevents submission if any invalid fields are found.
		 *  - Optionally validates all fields.
		 *  - Optionally moves focus to the first invalid field.
		 * 
		 * @param {object} evt The jQuery Event object as from the submit event. 
		 * 
		 * @returns {object} undefined if no validation was done, true if validation passed, false if validation didn't.
		 */
		checkValidityOnSubmitHandler = function(evt) {

			var $this,
				settings = getInstance.call(this),
				allValid;

			if(settings.submit !== true) {
				return;
			}

			$this = $(this);
			allValid = $this.h5Validate('allValid', { revalidate: settings.validateOnSubmit === true });

			if(allValid !== true) {
				evt.preventDefault();

				if(settings.focusFirstInvalidElementOnSubmit === true){
					var $invalid = $(settings.allValidSelectors, $this)
									.filter(function(index){
										return $(this).h5Validate('isValid', { revalidate: false }) !== true;
									});

					$invalid.first().focus();
				}
			}

			return allValid;
		},

		instances = [],

		buildSettings = function buildSettings(options) {
			// Combine defaults and options to get current settings.
			var settings = $.extend({}, defaults, options, methods),
				activeClass = settings.classPrefix + settings.activeClass;

			return $.extend(settings, {
				activeClass: activeClass,
				activeClassSelector: '.' + activeClass,
				requiredClass: settings.classPrefix + settings.requiredClass,
				el: this
			});
		},

		getInstance = function getInstance() {
			var $parent = $(this).closest('[data-h5-instanceId]');
			return instances[$parent.attr('data-h5-instanceId')];
		},

		setInstance = function setInstance(settings) {
			var instanceId = instances.push(settings) - 1;
			if (settings.RODom !== true) {
				$(this).attr('data-h5-instanceId', instanceId);
			}
			$(this).trigger('instance', { 'data-h5-instanceId': instanceId });
		};

	$.h5Validate = {
		/**
		 * Take a map of pattern names and HTML5-compatible regular
		 * expressions, and add them to the patternLibrary. Patterns in
		 * the library are automatically assigned to HTML element pattern
		 * attributes for validation.
		 * 
		 * @param {Object} patterns A map of pattern names and HTML5 compatible
		 * regular expressions.
		 * 
		 * @returns {Object} patternLibrary The modified pattern library
		 */
		addPatterns: function (patterns) {
			var patternLibrary = defaults.patternLibrary,
				key;
			for (key in patterns) {
				if (patterns.hasOwnProperty(key)) {
					patternLibrary[key] = patterns[key];
				}
			}
			return patternLibrary;
		},
		/**
		 * Take a valid jQuery selector, and a list of valid values to
		 * validate against.
		 * If the user input isn't in the list, validation fails.
		 * 
		 * @param {String} selector Any valid jQuery selector.
		 *
		 * @param {Array} values A list of valid values to validate selected 
		 * fields against.
		 */
		validValues: function (selector, values) {
			var i = 0,
				ln = values.length,
				pattern = '',
				re;
			// Build regex pattern
			for (i = 0; i < ln; i += 1) {
				pattern = pattern ? pattern + '|' + values[i] : values[i];
			}
			re = new RegExp('^(?:' + pattern + ')$');
			$(selector).data('regex', re);
		}
	};

	$.fn.h5Validate = function h5Validate(options) {
		var	action,
			args,
			settings;

		if (typeof options === 'string' && typeof methods[options] === 'function') {
			// Whoah, hold on there! First we need to get the instance:
			settings = getInstance.call(this);

			args = [].slice.call(arguments, 0);
			action = options;
			args.shift();
			args = $.merge([settings], args);

			// Use settings here so we can plug methods into the instance dynamically?
			return settings[action].apply(this, args);
		}

		settings = buildSettings.call(this, options);
		setInstance.call(this, settings);

		// Returning the jQuery object allows for method chaining.
		return methods.bindDelegation.call(this, settings);
	};
}(jQuery));