// @reference templates
// @reference ../lib
// @reference ~/styles/todos

$(function(){
  
  window.Todo = Backbone.Model.extend({

    defaults: function() {
      return {
        done:  false,
        order: Todos.nextOrder()
      };
    },

    toggle: function() {
      this.save({done: !this.get("done")});
    }

  });

  window.TodoList = Backbone.Collection.extend({

    model: Todo,

    localStorage: new Store("todos"),

    done: function() {
      return this.filter(function(todo){ return todo.get('done'); });
    },

    remaining: function() {
      return this.without.apply(this, this.done());
    },

    nextOrder: function() {
      if (!this.length) return 1;
      return this.last().get('order') + 1;
    },

    comparator: function(todo) {
      return todo.get('order');
    }

  });

  window.Todos = new TodoList;

  window.TodoView = Backbone.View.extend({
    
    tagName:  "li",
    
    events: {
      "click .check"              : "toggleDone",
      "dblclick div.todo-text"    : "edit",
      "click span.todo-destroy"   : "clear",
      "keypress .todo-input"      : "updateOnEnter"
    },
    
    initialize: function() {
      this.template = JST["item"];
      this.model.bind('change', this.render, this);
      this.model.bind('destroy', this.remove, this);
    },
    
    render: function() {
      $(this.el).html(this.template.render(this.model.toJSON()));
      this.setText();
      return this;
    },
    
    setText: function() {
      var text = this.model.get('text');
      this.$('.todo-text').text(text);
      this.input = this.$('.todo-input');
      this.input.bind('blur', _.bind(this.close, this)).val(text);
    },
    
    toggleDone: function() {
      this.model.toggle();
    },
    
    edit: function() {
      $(this.el).addClass("editing");
      this.input.focus();
    },
    
    close: function() {
      this.model.save({text: this.input.val()});
      $(this.el).removeClass("editing");
    },
    
    updateOnEnter: function(e) {
      if (e.keyCode == 13) this.close();
    },
    
    remove: function() {
      $(this.el).remove();
    },
    
    clear: function() {
      this.model.destroy();
    }
    
  });

  window.AppView = Backbone.View.extend({
    
    el: $("#todoapp"),
    
    events: {
      "keypress #new-todo":  "createOnEnter",
      "keyup #new-todo":     "showTooltip",
      "click .todo-clear a": "clearCompleted"
    },
    
    initialize: function() {
      this.template = JST["stats"];
      this.input    = this.$("#new-todo");
      
      Todos.bind('add',   this.addOne, this);
      Todos.bind('reset', this.addAll, this);
      Todos.bind('all',   this.render, this);
      
      Todos.fetch();
    },
    
    render: function() {
      this.$('#todo-stats').html(this.template.render({
        total:      Todos.length,
        done:       Todos.done().length,
        remaining:  Todos.remaining().length,
        isItemsPlural: Todos.remaining().length !== 1
      }));
    },
    
    addOne: function(todo) {
      var view = new TodoView({model: todo});
      $("#todo-list").append(view.render().el);
    },
    
    addAll: function() {
      Todos.each(this.addOne);
    },
    
    createOnEnter: function(e) {
      var text = this.input.val();
      if (!text || e.keyCode != 13) return;
      Todos.create({text: text});
      this.input.val('');
    },
    
    clearCompleted: function() {
      _.each(Todos.done(), function(todo){ todo.destroy(); });
      return false;
    },
    
    showTooltip: function(e) {
      var tooltip = this.$(".ui-tooltip-top");
      var val = this.input.val();
      tooltip.fadeOut();
      if (this.tooltipTimeout) clearTimeout(this.tooltipTimeout);
      if (val == '' || val == this.input.attr('placeholder')) return;
      var show = function(){ tooltip.show().fadeIn(); };
      this.tooltipTimeout = _.delay(show, 1000);
    }
    
  });
    
  window.App = new AppView;
    
});