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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Impostor.Api;
using Impostor.Api.Events;
using Impostor.Api.Events.Managers;
using Impostor.Server.Events.Register;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
namespace Impostor.Server.Events
{
internal class EventManager : IEventManager
{
private readonly ConcurrentDictionary<Type, TemporaryEventRegister> _temporaryEventListeners;
private readonly ConcurrentDictionary<Type, List<EventHandler>> _cachedEventHandlers;
private readonly ILogger<EventManager> _logger;
private readonly IServiceProvider _serviceProvider;
public EventManager(ILogger<EventManager> logger, IServiceProvider serviceProvider)
{
_logger = logger;
_serviceProvider = serviceProvider;
_temporaryEventListeners = new ConcurrentDictionary<Type, TemporaryEventRegister>();
_cachedEventHandlers = new ConcurrentDictionary<Type, List<EventHandler>>();
}
/// <inheritdoc />
public IDisposable RegisterListener<TListener>(TListener listener, Func<Func<Task>, Task> invoker = null)
where TListener : IEventListener
{
if (listener == null)
{
throw new ArgumentNullException(nameof(listener));
}
var eventListeners = RegisteredEventListener.FromType(listener.GetType());
var disposes = new IDisposable[eventListeners.Count];
foreach (var eventListener in eventListeners)
{
IRegisteredEventListener wrappedEventListener = new WrappedRegisteredEventListener(eventListener, listener);
if (invoker != null)
{
wrappedEventListener = new InvokedRegisteredEventListener(wrappedEventListener, invoker);
}
var register = _temporaryEventListeners.GetOrAdd(
wrappedEventListener.EventType,
_ => new TemporaryEventRegister());
register.Add(wrappedEventListener);
}
if (eventListeners.Count > 0)
{
_cachedEventHandlers.TryRemove(typeof(TListener), out _);
}
return new MultiDisposable(disposes);
}
/// <inheritdoc />
public bool IsRegistered<TEvent>()
where TEvent : IEvent
{
if (_cachedEventHandlers.TryGetValue(typeof(TEvent), out var handlers))
{
return handlers.Count > 0;
}
return GetHandlers<TEvent>().Any();
}
/// <inheritdoc />
public async ValueTask CallAsync<T>(T @event)
where T : IEvent
{
try
{
if (!_cachedEventHandlers.TryGetValue(typeof(T), out var handlers))
{
handlers = CacheEventHandlers<T>();
}
foreach (var (handler, eventListener) in handlers)
{
await eventListener.InvokeAsync(handler, @event, _serviceProvider);
}
}
catch (ImpostorCheatException)
{
throw;
}
catch (Exception e)
{
_logger.LogError(e, "Invocation of event {0} threw an exception.", @event.GetType().Name);
}
}
private List<EventHandler> CacheEventHandlers<TEvent>()
where TEvent : IEvent
{
var handlers = GetHandlers<TEvent>()
.OrderByDescending(e => e.Listener.Priority)
.ToList();
_cachedEventHandlers[typeof(TEvent)] = handlers;
return handlers;
}
/// <summary>
/// Get all the event listeners for the given event type.
/// </summary>
/// <returns>The event listeners.</returns>
private IEnumerable<EventHandler> GetHandlers<TEvent>()
where TEvent : IEvent
{
var eventType = typeof(TEvent);
var interfaces = eventType.GetInterfaces();
foreach (var @interface in interfaces)
{
if (_temporaryEventListeners.TryGetValue(@interface, out var cb))
{
foreach (var eventListener in cb.GetEventListeners())
{
yield return new EventHandler(null, eventListener);
}
}
}
foreach (var handler in _serviceProvider.GetServices<IEventListener>())
{
if (handler is IManualEventListener manualEventListener && manualEventListener.CanExecute<TEvent>())
{
yield return new EventHandler(handler, new ManualRegisteredEventListener(manualEventListener));
continue;
}
var events = RegisteredEventListener.FromType(handler.GetType());
foreach (var eventHandler in events)
{
if (eventHandler.EventType != typeof(TEvent) && !interfaces.Contains(eventHandler.EventType))
{
continue;
}
yield return new EventHandler(handler, eventHandler);
}
}
if (_temporaryEventListeners.TryGetValue(eventType, out var cb2))
{
foreach (var eventListener in cb2.GetEventListeners())
{
yield return new EventHandler(null, eventListener);
}
}
}
}
}
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