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XLAB2/EkzEditWindowViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Windows.Input;
+
+namespace XLAB2
+{
+    internal sealed class EkzEditWindowViewModel : ObservableObject
+    {
+        private readonly IReadOnlyList<EkzDirectoryItem> _existingItems;
+        private string _inventoryNumber;
+        private string _notes;
+        private int _ownerOrganizationId;
+        private string _serialNumber;
+        private int _typeSizeId;
+        private string _validationMessage;
+
+        public EkzEditWindowViewModel(EkzDirectoryItem seed, bool isNew, IReadOnlyList<EkzDirectoryItem> existingItems, EkzDirectoryService service)
+        {
+            var source = seed ?? new EkzDirectoryItem();
+            _existingItems = existingItems ?? Array.Empty<EkzDirectoryItem>();
+
+            Id = source.Id;
+            IsNew = isNew;
+            TypeSizeItems = service.LoadTypeSizeReferences();
+            OwnerItems = service.LoadFrpdReferences();
+            TypeSizeId = source.TypeSizeId;
+            OwnerOrganizationId = source.OwnerOrganizationId;
+            SerialNumber = source.SerialNumber ?? string.Empty;
+            InventoryNumber = source.InventoryNumber ?? string.Empty;
+            Notes = source.Notes ?? string.Empty;
+
+            ConfirmCommand = new RelayCommand(Confirm);
+            CancelCommand = new RelayCommand(Cancel);
+        }
+
+        public event EventHandler<bool?> CloseRequested;
+
+        public ICommand CancelCommand { get; private set; }
+
+        public ICommand ConfirmCommand { get; private set; }
+
+        public int Id { get; private set; }
+
+        public bool IsNew { get; private set; }
+
+        public string InventoryNumber
+        {
+            get { return _inventoryNumber; }
+            set { SetProperty(ref _inventoryNumber, value); }
+        }
+
+        public string Notes
+        {
+            get { return _notes; }
+            set { SetProperty(ref _notes, value); }
+        }
+
+        public IReadOnlyList<DirectoryLookupItem> OwnerItems { get; private set; }
+
+        public int OwnerOrganizationId
+        {
+            get { return _ownerOrganizationId; }
+            set { SetProperty(ref _ownerOrganizationId, value); }
+        }
+
+        public string SerialNumber
+        {
+            get { return _serialNumber; }
+            set { SetProperty(ref _serialNumber, value); }
+        }
+
+        public string Title
+        {
+            get { return IsNew ? "Новый экземпляр" : "Редактирование экземпляра"; }
+        }
+
+        public IReadOnlyList<DirectoryLookupItem> TypeSizeItems { get; private set; }
+
+        public int TypeSizeId
+        {
+            get { return _typeSizeId; }
+            set { SetProperty(ref _typeSizeId, value); }
+        }
+
+        public string ValidationMessage
+        {
+            get { return _validationMessage; }
+            private set { SetProperty(ref _validationMessage, value); }
+        }
+
+        public EkzDirectoryItem ToResult()
+        {
+            return new EkzDirectoryItem
+            {
+                Id = Id,
+                TypeSizeId = TypeSizeId,
+                OwnerOrganizationId = OwnerOrganizationId,
+                SerialNumber = Normalize(SerialNumber),
+                InventoryNumber = Normalize(InventoryNumber),
+                Notes = Normalize(Notes)
+            };
+        }
+
+        private void Cancel(object parameter)
+        {
+            RaiseCloseRequested(false);
+        }
+
+        private void Confirm(object parameter)
+        {
+            var serialNumber = Normalize(SerialNumber);
+            var inventoryNumber = Normalize(InventoryNumber);
+            var notes = Normalize(Notes);
+
+            if (TypeSizeId <= 0)
+            {
+                ValidationMessage = "Укажите типоразмер СИ.";
+                return;
+            }
+
+            if (OwnerOrganizationId <= 0)
+            {
+                ValidationMessage = "Укажите организацию-владельца.";
+                return;
+            }
+
+            if (string.IsNullOrWhiteSpace(serialNumber))
+            {
+                ValidationMessage = "Укажите заводской номер.";
+                return;
+            }
+
+            if (serialNumber.Length > EkzDirectoryRules.SerialNumberMaxLength)
+            {
+                ValidationMessage = string.Format("Заводской номер не должен превышать {0} символов.", EkzDirectoryRules.SerialNumberMaxLength);
+                return;
+            }
+
+            if (!string.IsNullOrWhiteSpace(inventoryNumber) && inventoryNumber.Length > EkzDirectoryRules.InventoryNumberMaxLength)
+            {
+                ValidationMessage = string.Format("Инвентарный номер не должен превышать {0} символов.", EkzDirectoryRules.InventoryNumberMaxLength);
+                return;
+            }
+
+            if (!string.IsNullOrWhiteSpace(notes) && notes.Length > EkzDirectoryRules.NotesMaxLength)
+            {
+                ValidationMessage = string.Format("Примечание не должно превышать {0} символов.", EkzDirectoryRules.NotesMaxLength);
+                return;
+            }
+
+            var duplicate = _existingItems.FirstOrDefault(delegate(EkzDirectoryItem item)
+            {
+                return item != null
+                       && item.Id != Id
+                       && item.TypeSizeId == TypeSizeId
+                       && item.OwnerOrganizationId == OwnerOrganizationId
+                       && string.Equals(item.SerialNumber ?? string.Empty, serialNumber ?? string.Empty, StringComparison.OrdinalIgnoreCase);
+            });
+
+            if (duplicate != null)
+            {
+                ValidationMessage = "Экземпляр с таким типоразмером, владельцем и заводским номером уже существует.";
+                return;
+            }
+
+            ValidationMessage = string.Empty;
+            RaiseCloseRequested(true);
+        }
+
+        private static string Normalize(string value)
+        {
+            return string.IsNullOrWhiteSpace(value) ? string.Empty : value.Trim();
+        }
+
+        private void RaiseCloseRequested(bool? dialogResult)
+        {
+            var handler = CloseRequested;
+            if (handler != null)
+            {
+                handler(this, dialogResult);
+            }
+        }
+    }
+}