1using System;
  2using MVPtoMVVM.domain;
  3using MVPtoMVVM.mvp.views;
  4using MVPtoMVVM.repositories;
  5
  6namespace MVPtoMVVM.mvp.presenters
  7{
  8    public class TodoItemPresenter : ITodoItemPresenter
  9    {
 10        private ITodoItemRepository itemRepository;
 11        private ITodoItemView view;
 12        public int Id { get; set; }
 13
 14        public TodoItemPresenter(ITodoItemRepository itemRepository)
 15        {
 16            this.itemRepository = itemRepository;
 17        }
 18
 19        public void SetView(ITodoItemView view)
 20        {
 21            this.view = view;
 22            InitializeView();
 23        }
 24
 25        private void InitializeView()
 26        {
 27            view.Id = Id;
 28            view.Description = Description;
 29            view.DueDate = DueDate;
 30            view.SaveButtonEnabled = false;
 31        }
 32
 33        private void UpdateControlState()
 34        {
 35            view.SaveButtonEnabled = IsDirty && IsDescriptionValid() && IsDueDateValid();
 36            view.DescriptionHasValidationErrors = !IsDescriptionValid();
 37            view.DescriptionValidationMessage = GetDescriptionValidationMessage();
 38            view.DueDateHasValidationErrors = !IsDueDateValid();
 39            view.DueDateValidationMessage = GetDueDateValidationMessage();
 40            view.IsDueSoon = IsDueSoon();
 41        }
 42
 43        public void SetItem(TodoItem item)
 44        {
 45            Id = item.Id;
 46            Description = item.Description;
 47            DueDate = item.DueDate;
 48            IsDirty = false;
 49        }
 50
 51        public void SaveItem()
 52        {
 53            var item = GetTodoItem();
 54            itemRepository.Save(item);
 55            Id = item.Id;
 56            IsDirty = false;
 57        }
 58
 59        private TodoItem GetTodoItem()
 60        {
 61            return new TodoItem {Id = Id, Description = Description, DueDate = DueDate};
 62        }
 63
 64        public void DeleteItem()
 65        {
 66            var item = GetTodoItem();
 67            view.Remove(item.Id);
 68            itemRepository.Delete(item);            
 69        }
 70
 71        private string description;
 72        public string Description
 73        {
 74            get { return description; }
 75            set { description = value;
 76                IsDirty = true;
 77            }
 78        }
 79
 80        private DateTime dueDate;
 81        public DateTime DueDate
 82        {
 83            get { return dueDate; }
 84            set { dueDate = value;
 85                IsDirty = true;
 86            }
 87        }
 88
 89        private bool isDirty;
 90
 91
 92        public bool IsDirty
 93        {
 94            get { return isDirty; }
 95            private set { isDirty = value;
 96            if (view != null)
 97                UpdateControlState();
 98            }
 99        }
100
101        private bool IsDescriptionValid()
102        {
103            return description.Length > 0;
104        }
105
106        private bool IsDueDateValid()
107        {
108            return dueDate >= DateTime.Today;
109        }
110
111        private bool IsDueSoon()
112        {
113            return dueDate <= DateTime.Today.AddDays(1);
114        }
115
116        private string GetDescriptionValidationMessage()
117        {
118            return IsDescriptionValid() ? null : "You must enter a description";
119        }
120
121        private string GetDueDateValidationMessage()
122        {
123            return IsDueDateValid() ? null : "Due Date must be today or later";
124        }
125    }
126}