(function () {
    var root = window || {};
    root = root.GravJS = root.GravJS || {};

    root.clickedButton = null;
    $(document).on('click', 'button.task', function(e) {
        root.clickedButton = e.target;
    });

    function addTypes (form, factory) {
        var name = factory.getName(),
            types = factory.getTypes();

        for (var i = types.length - 1; i >= 0; i--) {
            form.types[types[i]] = name;

            if (form.scanned) {
                scan(form, type);
            }
        }
    }

    function scan (form, type) {
        for (var i = form.elements.length - 1; i >= 0; i--) {
            if (!type || form.elements[i].type === type) {
                form.elements.splice(i, 1);
            }
        }

        if (Object.keys(form.types).length === 0 || (type && !form.types[type])) {
            return;
        }

        form.findElements().each(function () {
            var el = $(this),
                type = el.data(form.dataIndicator);

            if (type == 'textarea' || type == 'toggleable' || type == 'datetime') {
                var processSpan = function processSpan(element, toggleable) {
                    var on = true;
                    if (!toggleable) {
                        on = $(element).find('input').is(':checked');
                    }

                    $(element).find('label').css('opacity', on ? 1 : 0.7);
                    $(element).siblings('label').css('opacity', on ? 1 : 0.7);

                    if (!on) {
                        $(element).find('input').attr('checked', false).prop('value', 0);
                    } else {
                        $(element).find('input').attr('checked', true).prop('value', 1);
                    }

                    var form_data = $(element).parent().siblings('.form-data');

                    if (on) {
                        form_data.addClass('checked');
                    } else {
                        form_data.removeClass('checked');
                    }

                    form_data.css('opacity', on ? 1 : 0.6);
                    form_data.find('textarea').css('opacity', on ? 1 : 0.6);
                    form_data.find('input').css('opacity', on ? 1 : 0.6);
                };

                var processToggleables = function processToggleables(element) {
                    var elType = $(element)[0].tagName.toLowerCase();

                    if (elType == 'checkbox') {
                        var on = $(element).is(':checked');

                        $(element).siblings('label').css('opacity', on ? 1 : 0.7);
                        $(element).parent().siblings('label').css('opacity', on ? 1 : 0.7);

                        if (!on) {
                            $(element).attr('checked', false).prop('value', 0);
                        } else {
                            $(element).attr('checked', true).prop('value', 1);
                        }

                        var form_data = $(element).parent().parent().siblings('.form-data')

                        form_data.css('opacity', on ? 1 : 0.6);
                        form_data.find('textarea').css('opacity', on ? 1 : 0.6);
                        form_data.find('input').css('opacity', on ? 1 : 0.6);
                    }

                    if (elType == 'span') {
                        processSpan(element);
                    }
                };

                el.on('change input propertychange', function() {
                    processToggleables(this);
                });

                el.find('input').on('change', function() {
                    processToggleables(this);
                });

                if ($(el)[0].className == 'checkboxes toggleable') {
                    var toggles = $(el).parent().siblings('.form-data').find('label');
                    toggles.on('click', function() {
                        processSpan(el, true);
                    });
                }

                processToggleables(this);
            }

            if (form.types[type]) {
                var factory = form.factories[form.types[type]],
                    element = new factory(el, form),
                    name = element.name();

                if (typeof form.toggleables[name] !== 'undefined') {
                    linkToggle(element, form.toggleables[name]);
                    delete form.toggleables[name];
                }

                el.data('grav-field-instance', element);

                form.elements.push({ type: type, element: element });
            }
        });
    }

    function scanToggleable (form) {
        form.toggleables = {};
        form.findElements('toggleable').each(function () {
            var el = $(this);
            form.toggleables[el.data('grav-field-name')] = el;
        });
    }

    function linkToggle (element, toggleable) {
        $(element).on('change', function (value) {
            toggleable.find('input').prop('checked', true);
            toggleable.siblings('label').css('opacity', 1);
            element.disabled(false);
        });

        toggleable.find('input').on('change', function () {
            var el = $(this),
                on = el.is(':checked');

            toggleable.siblings('label').css('opacity', on ? 1 : 0.7);
            element.disabled(!on);
            if (!on) {
                element.el.attr('checked', false).prop('value', 0);
            } else {
                element.el.attr('checked', true).prop('value', 1);
            }
        });

        var on = toggleable.find('input').is(':checked');
        toggleable.siblings('label').css('opacity', on ? 1 : 0.7);
        element.disabled(!on);

        if (!on) {
            element.el.attr('checked', false).prop('value', 0);
        } else {
            element.el.attr('checked', true).prop('value', 1);
        }
    }

    var Form = function (el, options) {
        options = options || {};

        this.form = $(el);
        this.form.data('grav-form-instance', this);
        this.form.on('submit', function (e) {
            this.submit(this.ajax);
            e.preventDefault();
            return false;
        }.bind(this));

        this.scanned = false;

        this.fieldIndicator = options.fieldIndicator || 'data-grav-field';
        this.dataIndicator = options.dataIndicator || (this.fieldIndicator.indexOf('data-') === 0 ? this.fieldIndicator.substr(5) : 'grav-field');
        this.ajax = options.ajax || false;

        this.elements = [];

        this.factories = {};
        this.types = {};

        if (typeof options.globalFactories === 'undefined' || options.globalFactories) {
            for (var name in Form.factories) { if (Form.factories.hasOwnProperty(name)) {
                    this.registerFactory(Form.factories[name]);
                }
            }
        }

        scanToggleable(this);
        scan(this);
        this.scanned = true;

        //Refresh root.currentValues as toggleables have been initialized
        root.currentValues = getState();
    };

    Form.factories = {};

    Form.findElements = function(el, selector, notIn, notSelf) {
        el = $(el);
        notIn = notIn || selector,
        notSelf = notSelf ? true : false;

        return el.find(selector).filter(function() {
            var parent = notSelf ? $(this) : $(this).parent();
                nearestMatch = parent.closest(notIn);
            return nearestMatch.length == 0 || el.find(nearestMatch).length == 0;
        });
    };

    Form.registerFactory = function (factory, context) {
        context = context || Form.factories;
        context[factory.getName()] = factory;
        return true;
    };

    Form.extendFactory = function (parentName, factory, context) {
        context = context || Form.factories;

        if (!context[parentName]) {
            return false;
        }

        return Form.registerFactory(factory.getName(), $.extend({}, context[parentName], factory));
    };

    Form.prototype.findElements = function(type) {
        var selector = '[' + this.fieldIndicator + (type ? '="' + type + '"' : '') + ']';

        return Form.findElements(this.form, selector);
    };

    Form.prototype.registerFactory = function(factory) {
        var registered = Form.registerFactory(factory, this.factories);

        if (registered) {
            addTypes(this, this.factories[factory.getName()]);
        }
    };

    Form.prototype.extendFactory = function(parentName, factory) {
        var registered = Form.extendFactory(parentN, factory, this.factories);

        if (registered) {
            addTypes(this, this.factories[factory.getName()]);
        }
    };

    Form.prototype.getElements = function() {
        if (!this.scanned) {
            scan(this);
            this.scanned = true;
        }

        return this.elements;
    };

    Form.prototype.getValues = function(all) {
        var elements = this.getElements(),
            values = {};

        for (var i = elements.length - 1; i >= 0; i--) {
            var e = elements[i].element,
                isInDOM = $('body').find(e.el).length;

            if (!all && (!isInDOM || !e.valid() || e.disabled())) {
                continue;
            }

            $.extend(values, e.formValues());
        }

        return values;
    };

    Form.prototype.submit = function(ajax) {
        // TODO: workaround, need to rework forms
        this.scanned = false; // force to rescan items
        var action = this.form.attr('action') || document.location,
            method = this.form.attr('method') || 'POST',
            values = {};

        // Get form values that are not handled by JS framework
        Form.findElements(this.form, 'input, textarea', '', false).each(function(input) {
            var input = $(this),
                name = input.attr('name'),
                parent = input.parent('[data-grav-disabled]'),
                value = input.val();

            if (input.is(':disabled') || (parent && parent.data('grav-disabled') == 'true')) { return; }

            if (name) {
                values[name] = value;
            }
        });

        $.extend(values, this.getValues());

        if ($(root.clickedButton).attr('name') == 'task') {
            values.task = $(root.clickedButton).attr('value');
            if (values.task == 'saveas') {
                values.lang = $(root.clickedButton).attr('lang');
            }
            if (values.task == 'switchlanguage') {
                values.lang = $(root.clickedButton).attr('lang');
                values.redirect = $(root.clickedButton).attr('redirect');
            }
        }

        if (!values.task) {
            values.task = 'save';
        }

        if (!ajax) {
            var form = $('<form>').attr({ method: method, action: action });

            for (var name in values) {
                if (values.hasOwnProperty(name)) {
                    $('<input>').attr({ type: 'hidden', name: name, value: values[name] }).appendTo(form);
                }
            }

            return form.appendTo('body').submit();
        } else {
            return $.ajax({ method: method, url: action, data: values });
        }
    };

    root.Form = Form;
})();