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XLAB2/VerificationReportsWindowViewModel.cs

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+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace XLAB2
+{
+    internal sealed class VerificationReportsWindowViewModel : ObservableObject
+    {
+        private readonly IDialogService _dialogService;
+        private readonly VerificationReportsService _service;
+        private DateTime? _dateFrom;
+        private DateTime? _dateTo;
+        private bool _isBusy;
+        private int _selectedCustomerId;
+        private int _selectedMeasurementAreaId;
+        private VerificationReportSummary _summary;
+        private string _statusText;
+
+        public VerificationReportsWindowViewModel(VerificationReportsService service, IDialogService dialogService)
+        {
+            _service = service;
+            _dialogService = dialogService;
+
+            CustomerItems = new ObservableCollection<DirectoryLookupItem>();
+            MeasurementAreaItems = new ObservableCollection<DirectoryLookupItem>();
+            CustomerRows = new ObservableCollection<VerificationReportCustomerRow>();
+            MeasurementAreaRows = new ObservableCollection<VerificationReportMeasurementAreaRow>();
+            Summary = new VerificationReportSummary();
+
+            CustomerItems.Add(new DirectoryLookupItem { Id = 0, Name = "Все заказчики" });
+            MeasurementAreaItems.Add(new DirectoryLookupItem { Id = 0, Name = "Все области измерений" });
+
+            RefreshCommand = new RelayCommand(delegate { RefreshAsync(); }, delegate { return !IsBusy; });
+
+            UpdateStatus();
+        }
+
+        public ObservableCollection<DirectoryLookupItem> CustomerItems { get; private set; }
+
+        public ObservableCollection<VerificationReportCustomerRow> CustomerRows { get; private set; }
+
+        public DateTime? DateFrom
+        {
+            get { return _dateFrom; }
+            set
+            {
+                if (SetProperty(ref _dateFrom, value))
+                {
+                    OnPropertyChanged("PeriodText");
+                }
+            }
+        }
+
+        public DateTime? DateTo
+        {
+            get { return _dateTo; }
+            set
+            {
+                if (SetProperty(ref _dateTo, value))
+                {
+                    OnPropertyChanged("PeriodText");
+                }
+            }
+        }
+
+        public bool IsBusy
+        {
+            get { return _isBusy; }
+            private set
+            {
+                if (SetProperty(ref _isBusy, value))
+                {
+                    ((RelayCommand)RefreshCommand).RaiseCanExecuteChanged();
+                }
+            }
+        }
+
+        public ObservableCollection<DirectoryLookupItem> MeasurementAreaItems { get; private set; }
+
+        public ObservableCollection<VerificationReportMeasurementAreaRow> MeasurementAreaRows { get; private set; }
+
+        public string PeriodText
+        {
+            get
+            {
+                if (!DateFrom.HasValue && !DateTo.HasValue)
+                {
+                    return "Период: все время.";
+                }
+
+                if (DateFrom.HasValue && DateTo.HasValue)
+                {
+                    return string.Format("Период: с {0:d} по {1:d}.", DateFrom.Value, DateTo.Value);
+                }
+
+                if (DateFrom.HasValue)
+                {
+                    return string.Format("Период: с {0:d}.", DateFrom.Value);
+                }
+
+                return string.Format("Период: по {0:d}.", DateTo.Value);
+            }
+        }
+
+        public ICommand RefreshCommand { get; private set; }
+
+        public int SelectedCustomerId
+        {
+            get { return _selectedCustomerId; }
+            set { SetProperty(ref _selectedCustomerId, value); }
+        }
+
+        public int SelectedMeasurementAreaId
+        {
+            get { return _selectedMeasurementAreaId; }
+            set { SetProperty(ref _selectedMeasurementAreaId, value); }
+        }
+
+        public string StatusText
+        {
+            get { return _statusText; }
+            private set { SetProperty(ref _statusText, value); }
+        }
+
+        public VerificationReportSummary Summary
+        {
+            get { return _summary; }
+            private set { SetProperty(ref _summary, value); }
+        }
+
+        public async Task InitializeAsync()
+        {
+            await ExecuteBusyOperationAsync(async delegate
+            {
+                await LoadFiltersAsync();
+                await RefreshCoreAsync();
+            });
+        }
+
+        private VerificationReportFilter BuildFilter()
+        {
+            if (DateFrom.HasValue && DateTo.HasValue && DateFrom.Value.Date > DateTo.Value.Date)
+            {
+                throw new InvalidOperationException("Дата \"с\" не может быть позже даты \"по\".");
+            }
+
+            return new VerificationReportFilter
+            {
+                CustomerId = SelectedCustomerId > 0 ? SelectedCustomerId : (int?)null,
+                MeasurementAreaId = SelectedMeasurementAreaId > 0 ? SelectedMeasurementAreaId : (int?)null,
+                DateFrom = DateFrom,
+                DateTo = DateTo
+            };
+        }
+
+        private async Task ExecuteBusyOperationAsync(Func<Task> operation)
+        {
+            try
+            {
+                IsBusy = true;
+                await operation();
+            }
+            catch (InvalidOperationException ex)
+            {
+                _dialogService.ShowWarning(ex.Message);
+            }
+            catch (Exception ex)
+            {
+                _dialogService.ShowError(ex.Message);
+            }
+            finally
+            {
+                IsBusy = false;
+            }
+        }
+
+        private async Task LoadFiltersAsync()
+        {
+            var customersTask = Task.Run(delegate { return _service.LoadCustomerItems(); });
+            var measurementAreasTask = Task.Run(delegate { return _service.LoadMeasurementAreaItems(); });
+
+            await Task.WhenAll(customersTask, measurementAreasTask);
+
+            ApplyLookupItems(CustomerItems, customersTask.Result, "Все заказчики");
+            ApplyLookupItems(MeasurementAreaItems, measurementAreasTask.Result, "Все области измерений");
+
+            if (!CustomerItems.Any(delegate(DirectoryLookupItem item) { return item.Id == SelectedCustomerId; }))
+            {
+                SelectedCustomerId = 0;
+            }
+
+            if (!MeasurementAreaItems.Any(delegate(DirectoryLookupItem item) { return item.Id == SelectedMeasurementAreaId; }))
+            {
+                SelectedMeasurementAreaId = 0;
+            }
+        }
+
+        private static void ApplyLookupItems(ObservableCollection<DirectoryLookupItem> target, System.Collections.Generic.IReadOnlyList<DirectoryLookupItem> source, string allItemText)
+        {
+            target.Clear();
+            target.Add(new DirectoryLookupItem { Id = 0, Name = allItemText });
+
+            foreach (var item in source)
+            {
+                target.Add(item);
+            }
+        }
+
+        private async Task RefreshCoreAsync()
+        {
+            var filter = BuildFilter();
+            var report = await Task.Run(delegate { return _service.LoadReport(filter); });
+
+            Summary = report.Summary ?? new VerificationReportSummary();
+
+            CustomerRows.Clear();
+            foreach (var row in report.CustomerRows ?? Array.Empty<VerificationReportCustomerRow>())
+            {
+                CustomerRows.Add(row);
+            }
+
+            MeasurementAreaRows.Clear();
+            foreach (var row in report.MeasurementAreaRows ?? Array.Empty<VerificationReportMeasurementAreaRow>())
+            {
+                MeasurementAreaRows.Add(row);
+            }
+
+            UpdateStatus();
+        }
+
+        private async void RefreshAsync()
+        {
+            await ExecuteBusyOperationAsync(RefreshCoreAsync);
+        }
+
+        private void UpdateStatus()
+        {
+            StatusText = string.Format(
+                "Заказчиков в своде: {0}. Видов измерений в своде: {1}. Поверено: {2}. Годен: {3}. Забракован: {4}.",
+                CustomerRows.Count,
+                MeasurementAreaRows.Count,
+                Summary == null ? 0 : Summary.TotalCount,
+                Summary == null ? 0 : Summary.GoodCount,
+                Summary == null ? 0 : Summary.RejectedCount);
+        }
+    }
+}