Synnefo

;(function(root){

    // root

    var root = root;

    // setup namepsaces

    var snf = root.synnefo = root.synnefo || {};

    var models = snf.models = snf.models || {}

    var storage = snf.storage = snf.storage || {};

    var ui = snf.ui = snf.ui || {};

    var util = snf.util = snf.util || {};

    var views = snf.views = snf.views || {}

    // shortcuts

    var bb = root.Backbone;

    views.VMCreationPasswordView = views.Overlay.extend({

        view_id: "creation_password_view",

        content_selector: "#creation-password-overlay",

        css_class: 'overlay-password overlay-info',

        overlay_id: "creation-password-overlay",

        subtitle: "",

        title: "Machine password",

        initialize: function(options) {

            views.FeedbackView.__super__.initialize.apply(this, arguments);

            _.bindAll(this, 'show_password');

            this.password = this.$("#new-machine-password");

            this.copy = this.$(".clip-copy");

            this.$(".show-machine").click(_.bind(function(){

                if (this.$(".show-machine").hasClass("in-progress")) {

                    return;

                }

                this.hide();

                snf.ui.main.show_vm_details(storage.vms.get(this.vm_id));

            }, this));

            _.bindAll(this, "handle_vm_added");

            storage.vms.bind("add", this.handle_vm_added);

        },

        handle_vm_added: function() {

            this.$(".show-machine").removeClass("in-progress");

        },

        show_password: function() {

            this.$(".show-machine").addClass("in-progress");

            this.password.text(this.pass);

            if (storage.vms.get(this.vm_id)) {

                this.$(".show-machine").removeClass("in-progress");

            }

        },

        onClose: function() {

            this.password.text("");

            this.vm_id = undefined;

        },

        beforeOpen: function() {

            try { delete this.clipboard } catch (err) { console.log(err) };

            this.clipboard = new util.ClipHelper(this.copy);

        },

        onOpen: function() {

            this.copy.show();

            try {

                this.clipboard.setText(this.pass);

                this.copy.show();

            } catch (err) {

                this.copy.hide();

            }

        },

        show: function(pass, vm_id) {

            this.pass = pass;

            this.vm_id = vm_id;

            views.VMCreationPasswordView.__super__.show.apply(this, arguments);

            this.show_password();

        }

    })

    views.CreateVMStepView = views.View.extend({

        step: "1",

        title: "Image",

        submit: false,

        initialize: function(view) {

            this.parent = view;

            this.el = view.$("div.create-step-cont.step-" + this.step);

            this.header = this.$(".step-header .step-" + this.step);

            this.view_id = "create_step_" + this.step;

            views.CreateVMStepView.__super__.initialize.apply(this);

        },

        show: function() {

            // show current

            this.el.show();

            this.header.addClass("current");

            this.header.show();

            this.update_layout();

        },

        reset: function() {

        }

    })

    views.CreateImageSelectView = views.CreateVMStepView.extend({

        initialize: function() {

            views.CreateImageSelectView.__super__.initialize.apply(this, arguments);

            // elements

            this.images_list_cont = this.$(".images-list-cont");

            this.images_list = this.$(".images-list-cont ul");

            this.image_details = this.$(".images-info-cont");

            this.image_details_desc = this.$(".images-info-cont .description p");

            this.image_details_title = this.$(".images-info-cont h4");

            this.image_details_size = this.$(".images-info-cont .size p");

            this.image_details_os = this.$(".images-info-cont .os p");

            this.image_details_kernel = this.$(".images-info-cont .kernel p");

            this.image_details_gui = this.$(".images-info-cont .gui p");

            this.types = this.$(".type-filter li");

            this.categories_list = this.$(".category-filters");

            // params initialization

            this.type_selections = ["system", "custom"]

            this.selected_type = "system";

            this.selected_categories = [];

            this.images = [];

            // update

            this.update_images();

            // handlers initialization

            this.init_handlers();

            this.init_position();

        },

        init_position: function() {

            //this.el.css({position: "absolute"});

            //this.el.css({top:"10px"})

        },

        init_handlers: function() {

            var self = this;

            this.types.live("click", function() {

                self.select_type($(this).attr("id").replace("type-select-",""));

            })

        },

        update_images: function() {

            this.images = storage.images.active();

            this.images_ids = _.map(this.images, function(img){return img.id});

            if (this.selected_type == "custom") { this.images = []; this.images_ids = []; }

            return this.images;

        },

        update_layout: function() {

            this.select_type(this.selected_type);

        },

        get_categories: function(images) {

            return [];

            return ["Desktop", "Server", "Linux", "Windows"];

        },

        reset_categories: function() {

            var categories = this.get_categories(this.images);

            this.categories_list.find("li").remove();

            _.each(categories, _.bind(function(cat) {

                var el = $("<li />");

                el.text(cat);

                this.categories_list.append(el);

            }, this));

            if (!categories.length) { 

                this.categories_list.parent().find(".clear").hide();

                this.categories_list.parent().find(".empty").show();

            } else {

                this.categories_list.parent().find(".clear").show();

                this.categories_list.parent().find(".empty").hide();

            }

        },

        select_type: function(type) {

            this.selected_type = type;

            this.types.removeClass("selected");

            this.types.filter("#type-select-" + this.selected_type).addClass("selected");

            this.reset_categories();

            this.update_images();

            this.reset_images();

            this.select_image();

        },

        select_image: function(image) {

            if (!image && this.images_ids.length) {

                if (this.selected_image && this.images_ids.indexOf(this.selected_image.id) > -1) {

                    image = this.selected_image;

                } else {

                    image = storage.images.get(this.images_ids[0]);

                }

            }

            if (!this.images_ids.length) { image = this.selected_image || undefined };

            this.selected_image = image;

            this.trigger("change", image);

            if (image) {

                this.image_details.show();

                this.images_list.find(".image-details").removeClass("selected");

                this.images_list.find(".image-details#create-vm-image-" + this.selected_image.id).addClass("selected");

                this.image_details_desc.text(image.get("description"));

                var img = snf.ui.helpers.os_icon_tag(image.get("OS"))

                this.image_details_title.html(img + image.get("name"));

                this.image_details_os.text(_(image.get("OS")).capitalize());

                this.image_details_kernel.text(image.get("kernel"));

                var size = image.get_readable_size();

                this.image_details_size.text(size);

                this.image_details_gui.text(image.get("GUI"));

            } else {

                this.image_details.hide();

            }

            this.validate();

        },

        reset_images: function() {

            this.images_list.find("li").remove();

            _.each(this.images, _.bind(function(img){

                this.add_image(img);

            }, this))

            if (this.images.length) {

                this.images_list.parent().find(".empty").hide();

            } else {

                this.images_list.parent().find(".empty").show();

            }

            this.select_image();

            var self = this;

            this.images_list.find(".image-details").click(function(){

                self.select_image($(this).data("image"));

            });

        },

        show: function() {

            views.CreateImageSelectView.__super__.show.apply(this, arguments);

        },

        add_image: function(img) {

            var image = $(('<li id="create-vm-image-{1}"' +

                           'class="image-details clearfix">{2}{0}' +

                           '<p>{4}</p><span class="size">{3}' +

                           '</span></li>').format(img.get("name"), 

                                                  img.id, 

                                                  snf.ui.helpers.os_icon_tag(img.get("OS")),

                                                  img.get_readable_size(),

                                                  util.truncate(img.get("description"),35)));

            image.data("image", img);

            image.data("image_id", img.id);

            this.images_list.append(image);

        },

        reset: function() {

            this.selected_image = undefined;

            this.reset_images();

        },

        get: function() {

            return {'image': this.selected_image};

        },

        validate: function() {

            if (!this.selected_image) {

                this.parent.$(".form-action.next").hide();

            } else {

                this.parent.$(".form-action.next").show();

            }

        }

    });

    views.CreateFlavorSelectView = views.CreateVMStepView.extend({

        step: 2,

        initialize: function() {

            views.CreateFlavorSelectView.__super__.initialize.apply(this, arguments);

            this.parent.bind("image:change", _.bind(this.handle_image_change, this));

            this.cpus = this.$(".flavors-cpu-list");

            this.disks = this.$(".flavors-disk-list");

            this.mems = this.$(".flavors-mem-list");

            this.predefined_flavors = SUGGESTED_FLAVORS;

            this.predefined_flavors_keys = _.keys(SUGGESTED_FLAVORS);

            this.predefined_flavors_keys = _.sortBy(this.predefined_flavors_keys, _.bind(function(k){

                var flv = this.predefined_flavors[k];

                return flv.ram * flv.cpu * flv.disk;

            }, this));

            this.predefined = this.$(".predefined-list");

            this.update_predefined_flavors();

        },

        handle_image_change: function(data) {

            this.current_image = data;

            this.update_valid_predefined();

            this.update_flavors_data();

            this.reset_flavors();

            this.update_layout();

        },

        reset_flavors: function() {

            this.$(".flavor-opts-list .option").remove();

            this.create_flavors();

        },

        update_predefined_flavors: function() {

            this.predefined.find("li").remove();

            _.each(this.predefined_flavors_keys, _.bind(function(key) {

                var val = this.predefined_flavors[key];

                var el = $(('<li class="predefined-selection" id="predefined-flavor-{0}">' +

                           '{1}</li>').format(key, _(key).capitalize()));

                this.predefined.append(el);

                el.data({flavor: storage.flavors.get_flavor(val.cpu, val.ram, val.disk, this.flavors)})

                el.click(_.bind(function() {

                    this.handle_predefined_click(el);

                }, this))

            }, this));

            this.update_valid_predefined();

        },

        handle_predefined_click: function(el) {

            if (el.hasClass("disabled")) { return };

            this.set_current(el.data("flavor"))

        },

        update_valid_predefined: function() {

            this.update_unavailable_values();

            var self = this;

            this.valid_predefined = _.select(_.map(this.predefined_flavors, function(flv, key){

                var existing = storage.flavors.get_flavor(flv.cpu, flv.ram, flv.disk, self.flavors);

                // non existing

                if (!existing) {

                    return false;

                }

                // not available for image

                if (self.unavailable_values && self.unavailable_values.disk.indexOf(existing.get_disk_size()) > -1) {

                    return false

                }

                return key;

            }), function(ret) { return ret });

            $("li.predefined-selection").addClass("disabled");

            _.each(this.valid_predefined, function(key) {

                $("#predefined-flavor-" + key).removeClass("disabled");

            })

        },

        update_selected_predefined: function() {

            var self = this;

            this.predefined.find("li").removeClass("selected");

            _.each(this.valid_predefined, function(key){

                var flv = self.predefined_flavors[key];

                var exists = storage.flavors.get_flavor(flv.cpu, flv.ram, flv.disk, self.flavors);

                if (exists && (exists.id == self.current_flavor.id)) {

                    $("#predefined-flavor-" + key).addClass("selected");

                }

            })

        },

        update_flavors_data: function() {

            this.flavors = storage.flavors.active();

            this.flavors_data = storage.flavors.get_data(this.flavors);

            var self = this;

            var set = false;

            // FIXME: validate current flavor

            if (!this.current_flavor) {

                _.each(this.valid_predefined, function(key) {

                    var flv = self.predefined_flavors[key];

                    var exists = storage.flavors.get_flavor(flv.cpu, flv.ram, flv.disk, self.flavors);

                    if (exists && !set) {

                        self.set_current(exists);

                        set = true;

                    }

                })

            }

            this.update_unavailable_values();

        },

        update_unavailable_values: function() {

            if (!this.current_image) { this.unavailable_values = {disk:[], ram:[], cpu:[]}; return };

            this.unavailable_values = storage.flavors.unavailable_values_for_image(this.current_image);

        },

        flavor_is_valid: function(flv) {

            if (!flv) { return false };

            var existing = storage.flavors.get_flavor(flv.get("cpu"), flv.get("ram"), flv.get("disk"), this.flavors);

            if (!existing) { return false };

            if (this.unavailable_values && this.unavailable_values.disk.indexOf(flv.get("disk") > -1)) {

                return false

            }

            return true;

        },

        set_valid_current_for: function(t, val) {

            var found = this.flavors[0];

            _.each(this.flavors, function(flv) {

                if (flv.get(t) == val) {

                    found = flv;

                }

            });

            this.set_current(found);

        },

        set_current: function(flv) {

            if (!flv) {

                // user clicked on invalid combination

                // force the first available choice for the

                // type of option he last clicked

                this.set_valid_current_for.apply(this, this.last_choice);

                return;

            }

            this.current_flavor = flv;

            this.trigger("change");

            if (this.current_flavor) {

                this.update_selected_flavor();

                this.update_selected_predefined();

            }

            this.validate();

        },

        select_default_flavor: function() {

        },

        update_selected_from_ui: function() {

            this.set_current(this.ui_selected());

        },

        update_disabled_flavors: function() {

            this.$(".flavor-options.disk li").removeClass("disabled");

            if (!this.unavailable_values) { return }

            this.$("#create-vm-flavor-options .flavor-options.disk li").each(_.bind(function(i, el){

                var el_value = $(el).data("value") * 1000;

                if (this.unavailable_values.disk.indexOf(el_value) > -1) {

                    $(el).addClass("disabled");

                };

            }, this));

        },

        create_flavors: function() {

            var flavors = this.get_active_flavors();

            var valid_flavors = this.get_valid_flavors();

            this.__added_flavors = {'cpu':[], 'ram':[], 'disk':[]};

            _.each(flavors, _.bind(function(flv){

                this.add_flavor(flv);

            }, this));

            var self = this;

            this.$(".flavor-options li.option").click(function(){

                var el = $(this);

                if (el.hasClass("disabled")) { return }

                el.parent().find(".option").removeClass("selected");

                el.addClass("selected");

                if (el.hasClass("mem")) { self.last_choice = ["ram", $(this).data("value")] }

                if (el.hasClass("cpu")) { self.last_choice = ["cpu", $(this).data("value")] }

                if (el.hasClass("disk")) { self.last_choice = ["disk", $(this).data("value")] }

                self.update_selected_from_ui();

            })

        },

        ui_selected: function() {

            var args = [this.$(".option.cpu.selected").data("value"), 

                this.$(".option.mem.selected").data("value"), 

                this.$(".option.disk.selected").data("value"),

            this.flavors];

            var flv = storage.flavors.get_flavor.apply(storage.flavors, args);

            return flv;

        },

        update_selected_flavor: function() {

            var flv = this.current_flavor;

            if (!flv) { return }

            this.$(".option").removeClass("selected");

            this.$(".option.cpu.value-" + flv.get("cpu")).addClass("selected");

            this.$(".option.mem.value-" + flv.get("ram")).addClass("selected");

            this.$(".option.disk.value-" + flv.get("disk")).addClass("selected");

        },

        __added_flavors: {'cpu':[], 'ram':[], 'disk':[]},

        add_flavor: function(flv) {

            var values = {'cpu': flv.get('cpu'), 'mem': flv.get('ram'), 'disk': flv.get('disk')};

            disabled = "";

            if (this.__added_flavors.cpu.indexOf(values.cpu) == -1) {

                var cpu = $(('<li class="option cpu value-{0} {1}">' + 

                             '<span class="value">{0}</span>' + 

                             '<span class="metric">x</span></li>').format(values.cpu, disabled)).data('value', values.cpu);

                this.cpus.append(cpu);

                this.__added_flavors.cpu.push(values.cpu);

            }

            if (this.__added_flavors.ram.indexOf(values.mem) == -1) {

                var mem = $(('<li class="option mem value-{0}">' + 

                             '<span class="value">{0}</span>' + 

                             '<span class="metric">MB</span></li>').format(values.mem)).data('value', values.mem);

                this.mems.append(mem);

                this.__added_flavors.ram.push(values.mem);

            }

            if (this.__added_flavors.disk.indexOf(values.disk) == -1) {

                var disk = $(('<li class="option disk value-{0}">' + 

                              '<span class="value">{0}</span>' + 

                              '<span class="metric">GB</span></li>').format(values.disk)).data('value', values.disk);

                this.disks.append(disk);

                this.__added_flavors.disk.push(values.disk)

            }

        },

        get_active_flavors: function() {

            return storage.flavors.active();

        },

        get_valid_flavors: function() {

            return this.flavors;

        },

        update_layout: function() {

            this.update_selected_flavor();

            this.update_disabled_flavors();

            this.validate();

        },

        reset: function() {

            this.current_image = storage.images.at(0);

            this.flavors = [];

            this.flavors_data = {'cpu':[], 'mem':[], 'disk':[]};

            this.update_flavors_data();

        },

        validate: function() {

            if (!this.current_flavor) {

                this.parent.$(".form-action.next").hide();

            } else {

                this.parent.$(".form-action.next").show();

            }

        },

        get: function() {

            return {'flavor': this.current_flavor}

        }

    });

    views.CreateSubmitView = views.CreateVMStepView.extend({

        step: 3,

        initialize: function() {

            views.CreateSubmitView.__super__.initialize.apply(this, arguments);

            this.roles = this.$("li.predefined-meta.role .values");

            this.confirm = this.$(".confirm-params ul");

            this.name = this.$("input.rename-field");

            this.name_changed = false;

            this.init_suggested_roles();

            this.init_handlers();

        },

        init_suggested_roles: function() {

            var cont = this.roles;

            cont.empty();

            // TODO: get suggested from snf.api.conf

            _.each(window.SUGGESTED_ROLES, function(r){

                var el = $('<span class="val">{0}</span>'.format(r));

                el.data("value", r);

                cont.append(el);

                el.click(function() {

                    $(this).parent().find(".val").removeClass("selected");

                    $(this).toggleClass("selected");

                })

            })

        },

        init_handlers: function() {

            this.name.bind("keypress", _.bind(function(e) {

                this.name_changed = true;

                if (e.keyCode == 13) { this.parent.submit() };    

            }, this));

            this.name.bind("click", _.bind(function() {

                if (!this.name_changed) {

                    this.name.val("");

                }

            }, this))

        },

        show: function() {

            views.CreateSubmitView.__super__.show.apply(this, arguments);

            this.update_layout();

        },

        update_flavor_details: function() {

            var flavor = this.parent.get_params().flavor;

            function set_detail(sel, key) {

                var val = key;

                if (key == undefined) { val = flavor.get(sel) };

                this.$(".confirm-cont.flavor .flavor-" + sel + " .value").text(val)

            }

            set_detail("cpu", flavor.get("cpu") + "x");

            set_detail("ram", flavor.get("ram") + " MB");

            set_detail("disk", util.readablizeBytes(flavor.get("disk") * 1024 * 1024 * 1024));

        },

        update_image_details: function() {

            var image = this.parent.get_params().image;

            function set_detail(sel, key) {

                var val = key;

                if (key == undefined) { val = image.get(sel) };

                this.$(".confirm-cont.image .image-" + sel + " .value").text(val)

            }

            set_detail("description");

            set_detail("name");

            set_detail("os", _(image.get("OS")).capitalize());

            set_detail("gui", image.get("GUI"));

            set_detail("size", image.get_readable_size());

            set_detail("kernel");

        },

        update_layout: function() {

            var params = this.parent.get_params();

            if (!params.image || !params.flavor) { return }

            if (!params.image) { return }

            var vm_name = "My {0} server".format(params.image.get("name"));

            var orig_name = vm_name;

            var existing = true;

            var j = 0;

            while (existing && !this.name_changed) {

                var existing = storage.vms.select(function(vm){return vm.get("name") == vm_name}).length

                if (existing) {

                    j++;

                    vm_name = orig_name + " " + j;

                }

            }

            if (!_(this.name.val()).trim() || !this.name_changed) {

                this.name.val(vm_name);

            }

            this.confirm.find("li.image .value").text(params.flavor.get("image"));

            this.confirm.find("li.cpu .value").text(params.flavor.get("cpu") + "x");

            this.confirm.find("li.mem .value").text(params.flavor.get("ram"));

            this.confirm.find("li.disk .value").text(params.flavor.get("disk"));

            if (!this.name_changed && this.parent.visible()) {

                if (!$.browser.msie && !$.browser.opera) {

                    this.$("#create-vm-name").select();

                } else {

                    window.setTimeout(_.bind(function(){

                        this.$("#create-vm-name").select();

                    }, this), 400)

                }

            }

            var img = snf.ui.helpers.os_icon_path(params.image.get("OS"))

            this.name.css({backgroundImage:"url({0})".format(img)})

            this.update_image_details();

            this.update_flavor_details();

        },

        reset: function() {

            this.roles.find(".val").removeClass("selected");

            this.name_changed = false;

            this.update_layout();

        },

        get_meta: function() {

            if (this.roles.find(".selected").length == 0) {

                return false;

            }

            var role = $(this.roles.find(".selected").get(0)).data("value");

            return {'Role': role }

        },

        get: function() {

            var val = {'name': this.name.val() };

            if (this.get_meta()) {

                val.metadata = this.get_meta();

            }

            return val;

        }

    });

    views.CreateVMView = views.Overlay.extend({

        view_id: "create_vm_view",

        content_selector: "#createvm-overlay-content",

        css_class: 'overlay-createvm overlay-info',

        overlay_id: "metadata-overlay",

        subtitle: false,

        title: "Create new machine",

        initialize: function(options) {

            views.CreateVMView.__super__.initialize.apply(this);

            this.current_step = 1;

            this.password_view = new views.VMCreationPasswordView();

            this.steps = [];

            this.steps[1] = new views.CreateImageSelectView(this);

            this.steps[1].bind("change", _.bind(function(data) {this.trigger("image:change", data)}, this));

            this.steps[2] = new views.CreateFlavorSelectView(this);

            this.steps[3] = new views.CreateSubmitView(this);

            this.cancel_btn = this.$(".create-controls .cancel");

            this.next_btn = this.$(".create-controls .next");

            this.prev_btn = this.$(".create-controls .prev");

            this.submit_btn = this.$(".create-controls .submit");

            this.history = this.$(".steps-history");

            this.history_steps = this.$(".steps-history .steps-history-step");

            this.init_handlers();

        },

        init_handlers: function() {

            var self = this;

            this.next_btn.click(_.bind(function(){

                this.set_step(this.current_step + 1);

                this.update_layout();

            }, this))

            this.prev_btn.click(_.bind(function(){

                this.set_step(this.current_step - 1);

                this.update_layout();

            }, this))

            this.cancel_btn.click(_.bind(function(){

                this.close_all();

            }, this))

            this.submit_btn.click(_.bind(function(){

                this.submit();

            }, this))

            this.history.find(".completed").live("click", function() {

                var step = parseInt($(this).attr("id").replace("vm-create-step-history-", ""));

                self.set_step(step);

                self.update_layout();

            })

        },

        set_step: function(st) {

        },

        validate: function(data) {

            if (_(data.name).trim() == "") {

                this.$(".form-field").addClass("error");

                return false;

            } else {

                return true;

            }

        },

        submit: function() {

            if (this.submiting) { return };

            var data = this.get_params();

            var meta = {};

            if (this.validate(data)) {

                this.submit_btn.addClass("in-progress");

                this.submiting = true;

                if (data.metadata) { meta = data.metadata; }

                storage.vms.create(data.name, data.image, data.flavor, meta, {}, _.bind(function(data){

                    this.close_all();

                    this.password_view.show(data.server.adminPass, data.server.id);

                    this.submiting = false;

                }, this));

            }

        },

        close_all: function() {

            this.hide();

        },

        reset: function() {

            this.current_step = 1;

            this.steps[1].reset();

            this.steps[2].reset();

            this.steps[3].reset();

            this.steps[1].show();

            this.steps[2].show();

            this.steps[3].show();

            this.submit_btn.removeClass("in-progress");

        },

        onShow: function() {

            this.reset()

            this.update_layout();

        },

        update_layout: function() {

            this.show_step(this.current_step);

            this.current_view.update_layout();

        },

        beforeOpen: function() {

            this.submiting = false;

            this.reset();

            this.current_step = 1;

            this.$(".steps-container").css({"margin-left":0 + "px"});

            this.show_step(1);

        },

        set_step: function(step) {

            if (step <= 1) {

                step = 1

            }

            if (step > this.steps.length - 1) {

                step = this.steps.length - 1;

            }

            this.current_step = step;

        },

        show_step: function(step) {

            this.current_view = this.steps[step];

            this.update_controls();

            this.steps[step].show();

            var width = this.el.find('.container').width();

            var left = (step -1) * width * -1;

            this.$(".steps-container").animate({"margin-left": left + "px"}, 300);

            this.update_steps_history();

        },

        update_steps_history: function() {

            var self = this;

            function get_step(s) {

                return self.history.find(".step" + s + "h");

            }

            var current_step = parseInt(this.current_view.step);

            _.each(this.steps, function(stepv) {

                var step = parseInt(stepv.step);

                get_step(step).removeClass("completed").removeClass("current");

                if (step == current_step) {

                    get_step(step).removeClass("completed").addClass("current");

                }

                if (step < current_step) {

                    get_step(step).removeClass("current").addClass("completed");

                }

            });

        },

        update_controls: function() {

            var step = this.current_step;

            if (step == 1) {

                this.prev_btn.hide();

                this.cancel_btn.show();

            } else {

                this.prev_btn.show();

                this.cancel_btn.hide();

            }

            if (step == this.steps.length - 1) {

                this.next_btn.hide();

                this.submit_btn.show();

            } else {

                this.next_btn.show();

                this.submit_btn.hide();

            }

        },

        get_params: function() {

            return _.extend({}, this.steps[1].get(), this.steps[2].get(), this.steps[3].get());

        }

    });

})(this);