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              <div id="movies">
  <ul>
    <li> <span class="fa fa-trash"></span> Groundhog day
    <li> Breakfast Club
  </ul>
</div>
<div id="mocha"></div>

            
          
!
            
              //
////////////////////////////////////////////////////////////////////////////////
// Model 
//
var model = {
  items: [{
    id: 1,
    name: "Terminator",
    description: "I'll be back"
  }, {
    id: 2,
    name: "Avatar",
    description: "They're just pissing on us without even giving us the courtesy of calling it rain"
  }],
  itemId: 2
};

model.present = function(data) {
  data = data || {};

  if (data.deletedItemId !== undefined) {
    var d = -1 ;
    model.items.forEach(function(el,index) {
      if (el.id !== undefined) {
        if (el.id == data.deletedItemId) {
          d = index ;       
        }
      }
    });
    if (d>=0) {
      model.lastDeleted = model.items.splice(d,1)[0] ;
    }
  }  
  if (data.item !== undefined) {
    if (data.item.id !== null) {
      // has been edited
      model.items.forEach(function(el,index) {
        if (el.id !== undefined) {
          if (el.id == data.item.id) {
            model.items[index] = data.item;
          }
        }
      });

    } else {
      // new item
      data.item.id = model.itemId++ ;
      model.items.push(data.item) ;
    }
  }
  
  state.render(model);
}

//
////////////////////////////////////////////////////////////////////////////////
// View
//
var view = {};

// Initial State
view.init = function(model) {
  return view.ready(model);
};

// State representation of the ready state
view.ready = function(model) {
  model.lastEdited = model.lastEdited || {};
  var nameValue = model.lastEdited.name || 'Name';
  var descriptionValue = model.lastEdited.description || 'Description';
  var id = model.lastEdited.id || '';
  var output = (
    '<ul>\n\
               ' + model.items.map(function(e) {
      return ('<li><a href="#" onclick="JavaScript:return actions.delete({\'id\':\''+e.id+'\'});"><i class="fa fa-trash"></i></a>  ' + e.name + '</li>');
    }).join('\n') + '\n\
             </ul>\n'
  );
  return output;
};

//display the state representation
view.display = function(representation) {
  var stateRepresentation = document.getElementById("movies");
  stateRepresentation.innerHTML = representation;
};

// Display initial state
view.display(view.init(model));

////////////////////////////////////////////////////////////////////////////////
// State
//
var state = {
  view: view
};

model.state = state;

// Derive the state representation as a function of the systen
// control state
state.representation = function(model) {
  var representation = 'oops... something went wrong, the system is in an invalid state';

  if (state.ready(model)) {
    representation = state.view.ready(model);
  }

  state.view.display(representation);
};

// Derive the current state of the system
state.ready = function(model) {
  return true;
};

state.render = function(model) {
  state.representation(model)
};

////////////////////////////////////////////////////////////////////////////////
// Actions
//

var actions = {};

actions.save = function(data, present) {
  present = present || model.present;
  data.item = { name: data.name, description: data.description, id: data.id || null };
  present(data);
  return false;
};
actions.delete = function(data, present) {
  present = present || model.present;
  data = {
    deletedItemId: data.id
  };
  present(data);
  return false;
};




////////////////////////////////////////////////////////////////////////////////
/// TESTS
//

mocha.setup('bdd');
var expect = chai.expect;

describe("Canary", function() {
  it('works', () => {
    expect(true).to.equal(true);
  });
});
describe("List", function() {
  it('Delete Single Item', deleteSingleItem);
  it('Add Single Item', addSingleItem);
  it('Edit Single Item', editSingleItem);

  function deleteSingleItem() {
    model.items = [];
    model.items.push({
        id: 1,
        name: "Foo",
        description: "Bar"
      });

    actions.delete({ id: 1 });

    expect(model.items.length).to.equal(0);
  };  
  function addSingleItem() {
    model.items = [];

    actions.save({ 
      name: 'Foo',
      description: 'Bar',
    });

    expect(model.items.length).to.equal(1);
    expect(model.items[0].name).to.equal('Foo');
  };  
  function editSingleItem() {
    model.items = [{
      id: 1,
      name: 'Foo',
      description: 'Bar'
    }];

    actions.save({ 
      id: 1,
      name: 'Foo2',
      description: 'Bar'
    });

    expect(model.items.length).to.equal(1);
    expect(model.items[0].name).to.equal('Foo2');
  };  
});
  
mocha.run();

            
          
!
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