var App_User_Form = qs.createObject();

App_User_Form.prototype = {

    initialize: function (options)
    {
        this.className = 'App_User_Form';
        this.namespace = 'userForm';
        this.options = $.extend({}, options);

        if (this.initElements()) {
            this.initEvents();
        }

        return this;
    },

    initElements: function ()
    {
        this.form = $('#' + this.options.formId);
        if (!$(this.form).size()) {
            this.showError('Form "' + this.options.formId + '" not found.');
            return false;
        }

        this.element = {};

        for (var name in {'firstName': '', 'lastName': '', 'email': ''}) {
            this.element[name] = $('[name=' + name + ']', this.form);
            if (!$(this.form).size()) {
                this.showError('Element "' + name + '" not found');
                return false;
            }
        }

        return true;
    },

    initEvents: function ()
    {
        this.element.firstName.bind('blur.' + this.namespace, _.bind(this.onBlur, this, 'firstName'));
        this.element.lastName.bind('blur.' + this.namespace, _.bind(this.onBlur, this, 'lastName'));
        this.element.email.bind('blur.' + this.namespace, _.bind(this.onBlur, this, 'email'));

        for (var i = 0; i < this.options.addressTypes.length; i++) {
            var type = this.options.addressTypes[i];
            var asBilling = $('[name="' + type + '[asBilling]"]', this.form);
            if (asBilling.size()) {
                asBilling.bind('change.' + this.namespace, _.bind(this.onAsBillingClick, this, asBilling, type));
                this.onAsBillingClick(asBilling, type);
            }
        }

        return this;
    },

    onAsBillingClick: function (asBilling, type)
    {
        for (var i = 0; i < this.options.addressFields.length; i++) {
            var name = this.options.addressFields[i];
            var idTpl = type + '-' + name + '-';
            var selector = '#' + idTpl + 'label, #' + idTpl + 'element';
            if ($(asBilling).is(':checked')) {
                $(selector).addClass('hidden');
            } else {
                $(selector).removeClass('hidden');
                if (!this.getElementValue(type, name)) {
                    this.setElementValue(type, name, this.getElementValue(this.options.inheritedAddress, name));
                }
            }
        }
        return true;
    },

    onBlur: function (name)
    {
        var value = $(this.element[name]).val();
        if (value && !this.getElementValue(this.options.inheritedAddress, name)) {
            this.setElementValue(this.options.inheritedAddress, name, value);
        }

        return this;
    },

    getElementValue: function (type, name)
    {
        return $('#' + type + '-' + name, this.form).val();
    },

    setElementValue: function (type, name, value)
    {
        $('#' + type + '-' + name, this.form).val(value);
    },

    showError: function (error)
    {
        alert(this.className + ' can not be initialized. ' + error);
        return this;
    }
};