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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.Entities;
using Tango.Core;
using Tango.PMR.Diagnostics;
namespace Tango.Integration.Operation
{
/// <summary>
/// Represents the default machine events state provider.
/// </summary>
/// <seealso cref="Tango.Integration.Operation.IMachineEventsStateProvider" />
public class DefaultMachineEventsStateProvider : ExtendedObject, IMachineEventsStateProvider
{
private ReadOnlyCollection<MachinesEvent> _events;
/// <summary>
/// Gets the current machine events.
/// </summary>
public ReadOnlyCollection<MachinesEvent> Events
{
get
{
return _events;
}
}
/// <summary>
/// Gets or sets a value indicating whether this instance has events.
/// </summary>
public bool HasEvents
{
get
{
return Events.Count > 0;
}
}
/// <summary>
/// Occurs when new events are available.
/// </summary>
public event EventHandler<IEnumerable<MachinesEvent>> NewEvents;
/// <summary>
/// Occurs when a new events states has been received.
/// </summary>
public event EventHandler<IEnumerable<MachinesEvent>> EventsReceived;
/// <summary>
/// Occurs when old events has been resolved.
/// </summary>
public event EventHandler<IEnumerable<MachinesEvent>> EventsResolved;
/// <summary>
/// Occurs when the collection of current events has changed.
/// </summary>
public event EventHandler<IEnumerable<MachinesEvent>> EventsChanged;
/// <summary>
/// Initializes a new instance of the <see cref="DefaultMachineEventsStateProvider"/> class.
/// </summary>
public DefaultMachineEventsStateProvider()
{
_events = new ReadOnlyCollection<MachinesEvent>(new Collection<MachinesEvent>());
}
/// <summary>
/// Applies the collection of events received from the machine operator.
/// </summary>
/// <param name="events">The events.</param>
public void ApplyEvents(IEnumerable<Event> events)
{
List<MachinesEvent> receivedEvents = events.Select(x => new MachinesEvent(x)).ToList();
List<MachinesEvent> newEvents = receivedEvents.Where(x => !_events.ToList().Exists(y => y.Type == x.Type)).ToList();
List<MachinesEvent> oldEvents = _events.Where(x => !receivedEvents.Exists(y => y.Type == x.Type)).ToList();
_events = new ReadOnlyCollection<MachinesEvent>(receivedEvents);
if (newEvents.Count > 0)
{
OnNewEvents(newEvents);
}
if (oldEvents.Count > 0)
{
OnEventsResolved(oldEvents);
}
if (newEvents.Count > 0 || oldEvents.Count > 0)
{
RaisePropertyChanged(nameof(Events));
OnEventsChanged(newEvents.Concat(oldEvents));
}
OnEventsReceived(_events);
RaisePropertyChanged(nameof(HasEvents));
}
/// <summary>
/// Called when the new has been events
/// </summary>
/// <param name="events">The events.</param>
protected virtual void OnNewEvents(IEnumerable<MachinesEvent> events)
{
NewEvents?.Invoke(this, events);
}
/// <summary>
/// Called when the events has been received
/// </summary>
/// <param name="events">The events.</param>
protected virtual void OnEventsReceived(IEnumerable<MachinesEvent> events)
{
EventsReceived?.Invoke(this, events);
}
/// <summary>
/// Called when the events has been resolved
/// </summary>
/// <param name="events">The events.</param>
protected virtual void OnEventsResolved(IEnumerable<MachinesEvent> events)
{
EventsResolved?.Invoke(this, events);
}
/// <summary>
/// Called when the events has been changed
/// </summary>
/// <param name="events">The events.</param>
protected virtual void OnEventsChanged(IEnumerable<MachinesEvent> events)
{
EventsChanged?.Invoke(this, events);
}
/// <summary>
/// Resets the current events tracking.
/// </summary>
public void Reset()
{
_events = new ReadOnlyCollection<MachinesEvent>(new List<MachinesEvent>());
RaisePropertyChanged(nameof(Events));
OnEventsChanged(new List<MachinesEvent>());
}
}
}
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