(function ($) {

    _.templateSettings = {
       // interpolate: /\{\{(.+?)\}\}/g   // {{ }} syntax for templating insteat of  of <%= property %>
    };

    var contacts = [
        { name: "Contact 1", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "[email protected]", type: "family" },
        { name: "Contact 2", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "[email protected]", type: "family" },
        { name: "Contact 3", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "[email protected]", type: "friend" },
        { name: "Contact 4", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "[email protected]", type: "colleague" },
        { name: "Contact 5", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "[email protected]", type: "family" },
        { name: "Contact 6", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "[email protected]", type: "colleague" },
        { name: "Contact 7", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "[email protected]", type: "friend" },
        { name: "Contact 8", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "[email protected]", type: "family" }
    ];

    // A model represents the data of an application; in our application this will be an individual contact, which will have attributes such as a name, a contact number, etc. You could say that an individual model represents the atomic part of the application – the smallest possible unit of functionality.



    var Contact = Backbone.Model.extend({
        defaults: {
            photo: "img/placeholder.png",
            name: "",
            address: "",
            tel: "",
            email: "",
            type: ""
        }
    });

    // A collection is a class for managing groups of models.
    var Directory = Backbone.Collection.extend({
        model: Contact
    });

    var ContactView = Backbone.View.extend({
        tagName: "article",
        className: "contact-container",
        template: $("#contactTemplate").html(),
        editTemplate: _.template($("#contactEditTemplate").html()),
        render: function () {
            var tmpl = _.template(this.template);

            //console.log(this.$el);
            console.log(this.model.toJSON());

            this.$el.html(tmpl(this.model.toJSON()));
            return this;
        },
        events: {
            "click button.delete": "deleteContact",
            "click button.edit": "editContact",
            "change select.type": "addType",
            "click button.save": "saveEdits",
            "click button.cancel": "cancelEdit"
        },
        deleteContact: function () {
           var removedType = this.model.get("type").toLowerCase();
            this.model.destroy();
            this.remove();
            if (_.indexOf(directory.getTypes(), removedType) === -1) {
                directory.$el.find("#filter select").children("[value='" + removedType + "']").remove();
            }
        },
        editContact: function () {
            this.$el.html(this.editTemplate(this.model.toJSON()));
            var newOpt = $("<option/>", {
                html: "<em>Add new...</em>",
                value: "addType"
            });
            this.select = directory.createSelect().addClass("type")
                .val(this.$el.find("#type").val()).append(newOpt)
                .insertAfter(this.$el.find(".name"));
            this.$el.find("input[type='hidden']").remove();


        },
        saveEdits: function (e) {
           e.preventDefault();
            var formData = {},
                prev = this.model.previousAttributes();
            $(e.target).closest("form").find(":input").not(':button').add(".photo").each(function () { // where is .not('button')
                var el = $(this);
                formData[el.attr("class")] = el.val();
            });
            if (formData.photo === "") {
                delete formData.photo;
            }
            this.model.set(formData);
            this.render();
            if (prev.photo === "/img/placeholder.png") {
                delete prev.photo;
            }
            _.each(contacts, function (contact) {
                if (_.isEqual(contact, prev)) {
                    contacts.splice(_.indexOf(contacts, contact), 1, formData);
                }
            });
        },

        addType: function() {
            if (this.select.val() === "addType") {
                this.select.remove();
                $("<input />", {
                    "class": "type"
                }).insertAfter(this.$el.find(".name")).focus();
            }
        },
        cancelEdit: function () {
            this.render();
        },
    });

    var ContactsRouter = Backbone.Router.extend({
        routes: {
            "filter/:type": "urlFilter"
        },
        urlFilter: function (type) {
            directory.filterType = type;
            directory.trigger("change:filterType");
        }
    });

    var DirectoryView = Backbone.View.extend({
        el: $("#contacts"),
        initialize: function () {
            this.collection = new Directory(contacts);
            this.render();
            this.$el.find("#filter").append(this.createSelect());
            this.on("change:filterType", this.filterByType, this);
            this.collection.on("reset", this.render, this);
            this.collection.on("add", this.renderContact, this);
            this.collection.on("remove", this.removeContact, this);
        },
        render: function () {
            this.$el.find("article").remove();

            var that = this;
            _.each(this.collection.models, function (item) {
                that.renderContact(item);
            }, this);
        },
        renderContact: function (item) {
            var contactView = new ContactView({
                model: item
            });
            this.$el.append(contactView.render().el);
        },
        getTypes: function () {
            return _.uniq(this.collection.pluck("type"), false, function (type) {
                return type.toLowerCase();
            });
        },
        createSelect: function () {
            var filter = this.$el.find("#filter"),
                select = $("<select/>", {
                    html: "<option value='all'>All</option>"
                });
            _.each(this.getTypes(), function (item) {
                var option = $("<option/>", {
                    value: item.toLowerCase(),
                    text: item.toLowerCase()
                }).appendTo(select);
            });
            return select;
        },
        events: {
            "change #filter select": "setFilter",
            "click #add": "addContact",
            "click #showForm": "showForm"
        },
        setFilter: function (e) {
            this.filterType = e.currentTarget.value;
            this.trigger("change:filterType");
        },
        filterByType: function () {
            if (this.filterType === "all") {
                this.collection.reset(contacts);
                contactsRouter.navigate("filter/all");
            } else {
                this.collection.reset(contacts, { silent: true });
                var filterType = this.filterType,
                    filtered = _.filter(this.collection.models, function (item) {
                        return item.get("type") === filterType;
                });
                this.collection.reset(filtered);
                contactsRouter.navigate("filter/" + filterType);
            }
        },
        addContact: function (e) {
            e.preventDefault();
            var newModel = {};
            $("#addContact").children("input").each(function (i, el) {
                if ($(el).val() !== "") {
                    newModel[el.id] = $(el).val();
              }
            });
            contacts.push(newModel);
            if (_.indexOf(this.getTypes(), newModel.type) === -1) {
                 this.collection.add(new Contact(newModel));
                this.$el.find("#filter").find("select").remove().end().append(this.createSelect());
            } else {
                this.collection.add(new Contact(newModel));
            }
        },
        removeContact: function (removedModel) {
            var removed = removedModel.attributes;
            if (removed.photo === "/img/placeholder.png") {
                delete removed.photo;
            }
            _.each(contacts, function (contact) {
                if (_.isEqual(contact, removed)) {
                    contacts.splice(_.indexOf(contacts, contact), 1);
                }
            });
        },
        showForm: function () {
            this.$el.find("#addContact").slideToggle();
        }

    });

    var directory = new DirectoryView();
    var contactsRouter = new ContactsRouter();
    Backbone.history.start();

} (jQuery));