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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.BL;
using Tango.BL.Entities;
using Tango.MachineStudio.Common;
using System.Data.Entity;
using Tango.MachineStudio.Common.Notifications;
using Tango.MachineStudio.Dispensers.Contracts;
using Tango.Core.Commands;
using Tango.Core.Threading;

namespace Tango.MachineStudio.Dispensers.ViewModels
{
    public class MainViewVM : StudioViewModel<IMainView>
    {
        private ObservablesContext _dbContext;
        private ObservablesContext _activeContext;
        private INotificationProvider _notification;
        private ActionTimer _filter_timer;

        private ObservableCollection<Dispenser> _dispensers;
        public ObservableCollection<Dispenser> Dispensers
        {
            get { return _dispensers; }
            set { _dispensers = value; RaisePropertyChangedAuto(); }
        }

        private Dispenser _selectedDispenser;
        public Dispenser SelectedDispenser
        {
            get { return _selectedDispenser; }
            set { _selectedDispenser = value; RaisePropertyChangedAuto(); InvalidateRelayCommands(); }
        }

        private Dispenser _activeDispenser;
        public Dispenser ActiveDispenser
        {
            get { return _activeDispenser; }
            set { _activeDispenser = value; RaisePropertyChangedAuto(); }
        }

        private ObservableCollection<DispenserType> _dispenserTypes;
        public ObservableCollection<DispenserType> DispenserTypes
        {
            get { return _dispenserTypes; }
            set { _dispenserTypes = value; RaisePropertyChangedAuto(); }
        }

        private String _filter;
        public String Filter
        {
            get { return _filter; }
            set { _filter = value; RaisePropertyChangedAuto(); OnFilterChanged(); }
        }

        public RelayCommand AddDispenserCommand { get; set; }

        public RelayCommand RemoveDispenserCommand { get; set; }

        public
set; } public RelayCommand BackToDispensersCommand { get; set; } public RelayCommand SaveCommand { get; set; } public MainViewVM(INotificationProvider notificationProvider) { _notification = notificationProvider; _filter_timer = new ActionTimer(TimeSpan.FromMilliseconds(200)); ManageDispenserCommand = new RelayCommand(() => LoadSelectedDispenser(), () => SelectedDispenser != null); BackToDispensersCommand = new RelayCommand(() => { View.NavigateTo(DispensersNavigationView.DispensersView); }); SaveCommand = new RelayCommand(SaveActiveDispenser); AddDispenserCommand = new RelayCommand(AddNewDispenser); RemoveDispenserCommand = new RelayCommand(RemoveSelectedDispenser, () => SelectedDispenser != null); } private void OnFilterChanged() { if (Filter != null) { _filter_timer.ResetReplace(() => { IsFree = false; Dispensers = _dbContext.Dispensers.Where(x => x.SerialNumber.ToLower().StartsWith(Filter.ToLower())).Include(x => x.DispenserType).Include(x => x.IdsPacks).ToList().ToObservableCollection(); IsFree = true; }); } } private async void LoadSelectedDispenser(bool isNew = false) { if (_activeContext != null) { _activeContext.Dispose(); } using (_notification.PushTaskItem("Loading dispenser data...")) { try { IsFree = false; _activeContext = ObservablesContext.CreateDefault(); DispenserTypes = (await _activeContext.DispenserTypes.ToListAsync()).ToObservableCollection(); if (!isNew) { ActiveDispenser = await _activeContext.Dispensers.Include(x => x.DispenserType).Include(x => x.IdsPacks).SingleOrDefaultAsync(x => x.Guid == SelectedDispenser.Guid); ActiveDispenser.InitMachine(_activeContext); } else { ActiveDispenser = new Dispenser(); _activeContext.Dispensers.Add(ActiveDispenser); } View.NavigateTo(DispensersNavigationView.DispenserView); } catch (Exception ex) { LogManager.Log(ex, $"Error loading dispenser {SelectedDispenser.SerialNumber}."); _notification.ShowError($"An error occurred while trying to load the selected dispenser data.\n{ex.Message}"); } finally { IsFree = true; InvalidateRelayCommands(); } } } private void AddNewDispenser() { LoadSelectedDispenser(true); } private async void RemoveSelectedDispenser() { if (_notification.ShowQuestion("Are you sure you want to delete the selected dispenser?")) { try { IsFree = false; if (SelectedDispenser.IsInstalled) { _notification.ShowError("Cannot delete an installed dispenser. Please detach it first from it's machine and try again."); return; } _dbContext.Dispensers.Remove(SelectedDispenser); await _dbContext.SaveChangesAsync(); Dispensers.Remove(SelectedDispenser); } catch (Exception ex) { LogManager.Log(ex, $"Error removing dispenser {SelectedDispenser.SerialNumber}."); _notification.ShowError($"An error occurred while trying to remove the selected dispenser.\n{ex.FlattenMessage()}"); } finally { IsFree = true; } } } private async void SaveActiveDispenser() { using (_notification.PushTaskItem("Saving dispenser data...")) { try { IsFree = false; await _activeContext.SaveChangesAsync(); if (SelectedDispenser != null) { await SelectedDispenser.Reload(_dbContext); } View.NavigateTo(DispensersNavigationView.DispensersView); } catch (Exception ex) { LogManager.Log(ex, $"Error saving dispenser {ActiveDispenser.SerialNumber}."); _notification.ShowError($"An error occurred while trying to save the dispenser data.\n{ex.Message}"); } finally { IsFree = true; InvalidateRelayCommands(); } } } public async override void OnApplicationReady() { _dbContext = ObservablesContext.CreateDefault(); await _dbContext.DispenserTypes.LoadAsync(); } } }