/*!
 * jQuery Plugin: Are-You-Sure (Dirty Form Detection)
 * https://github.com/codedance/jquery.AreYouSure/
 *
 * Copyright (c) 2012-2014, Chris Dance and PaperCut Software http://www.papercut.com/
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://jquery.org/license
 *
 * Author:  chris.dance@papercut.com
 * Version: 1.9.0
 * Date:    13th August 2014
 */
(function ($) {
    $.fn.areYouSure = function (options) {
        var settings = $.extend(
            {
                message: "You have unsaved changes!",
                dirtyClass: "dirty",
                change: null,
                silent: false,
                addRemoveFieldsMarksDirty: false,
                fieldEvents: "change keyup propertychange input",
                fieldSelector: ":input:not(input[type=submit]):not(input[type=button])",
            },
            options
        );

        var getValue = function ($field) {
            if (
                $field.hasClass("ays-ignore") ||
                $field.hasClass("aysIgnore") ||
                $field.attr("data-ays-ignore") ||
                $field.attr("name") === undefined
            ) {
                return null;
            }

            if ($field.is(":disabled")) {
                return "ays-disabled";
            }

            var val;
            var type = $field.attr("type");
            if ($field.is("select")) {
                type = "select";
            }

            switch (type) {
                case "checkbox":
                case "radio":
                    val = $field.is(":checked");
                    break;
                case "select":
                    val = "";
                    $field.find("option").each(function (o) {
                        var $option = $(this);
                        if ($option.is(":selected")) {
                            val += $option.val();
                        }
                    });
                    break;
                default:
                    val = $field.val();
            }

            return val;
        };

        var storeOrigValue = function ($field) {
            $field.data("ays-orig", getValue($field));
        };

        var checkForm = function (evt) {
            var isFieldDirty = function ($field) {
                var origValue = $field.data("ays-orig");
                if (undefined === origValue) {
                    return false;
                }
                return getValue($field) != origValue;
            };

            var $form = $(this).is("form") ? $(this) : $(this).parents("form");

            // Test on the target first as it's the most likely to be dirty
            if (isFieldDirty($(evt.target))) {
                setDirtyStatus($form, true);
                return;
            }

      var $fields = $form.find(settings.fieldSelector);

            if (settings.addRemoveFieldsMarksDirty) {
                // Check if field count has changed
                var origCount = $form.data("ays-orig-field-count");
                if (origCount != $fields.length) {
                    setDirtyStatus($form, true);
                    return;
                }
            }

            // Brute force - check each field
            var isDirty = false;
            $fields.each(function () {
        var $field = $(this);
                if (isFieldDirty($field)) {
                    isDirty = true;
                    return false; // break
                }
            });

            //setDirtyStatus($form, isDirty);
        };

        var initForm = function ($form) {
            var fields = $form.find(settings.fieldSelector);
            $(fields).each(function () {
                storeOrigValue($(this));
            });
            $(fields).unbind(settings.fieldEvents, checkForm);
            $(fields).bind(settings.fieldEvents, checkForm);
            $form.data("ays-orig-field-count", $(fields).length);
            setDirtyStatus($form, false);
        };

        var setDirtyStatus = function ($form, isDirty) {
            var changed = isDirty != $form.hasClass(settings.dirtyClass);
            $form.toggleClass(settings.dirtyClass, isDirty);

            // Fire change event if required
            if (changed) {
                if (settings.change) settings.change.call($form, $form);
                if (isDirty) $form.trigger("dirty.areYouSure", [$form]);
                if (!isDirty) $form.trigger("clean.areYouSure", [$form]);
                $form.trigger("change.areYouSure", [$form]);
            }
        };

        var rescan = function () {
            var $form = $(this);
            var fields = $form.find(settings.fieldSelector);
            $(fields).each(function () {
                var $field = $(this);
                if (!$field.data("ays-orig")) {
                    storeOrigValue($field);
                    $field.bind(settings.fieldEvents, checkForm);
                }
            });
            // Check for changes while we're here
            $form.trigger("checkform.areYouSure");
        };

        var reinitialize = function () {
            initForm($(this));
        };

        if (!settings.silent && !window.aysUnloadSet) {
            window.aysUnloadSet = true;
            $(window).bind("beforeunload", function () {
                var $dirtyForms = $("form").filter("." + settings.dirtyClass);
                if ($dirtyForms.length == 0) {
                    return;
                }
                // Prevent multiple prompts - seen on Chrome and IE
                if (navigator.userAgent.toLowerCase().match(/msie|chrome/)) {
                    if (window.aysHasPrompted) {
                        return;
                    }
                    window.aysHasPrompted = true;
                    window.setTimeout(function () {
                        window.aysHasPrompted = false;
                    }, 900);
                }
                return settings.message;
            });
        }

        return this.each(function (elem) {
            if (!$(this).is("form")) {
                return;
            }
            var $form = $(this);

            $form.submit(function () {
                $form.removeClass(settings.dirtyClass);
            });
            $form.bind("reset", function () {
                setDirtyStatus($form, false);
            });
            // Add a custom events
            $form.bind("rescan.areYouSure", rescan);
            $form.bind("reinitialize.areYouSure", reinitialize);
            $form.bind("checkform.areYouSure", checkForm);
            initForm($form);
        });
    };
})(jQuery);