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using System;
using StardewModdingAPI.Events;
namespace StardewModdingAPI.Framework.Events
{
/// <summary>An event handler wrapper which tracks metadata about an event handler.</summary>
/// <typeparam name="TEventArgs">The event arguments type.</typeparam>
internal class ManagedEventHandler<TEventArgs> : IComparable
{
/*********
** Accessors
*********/
/// <summary>The event handler method.</summary>
public EventHandler<TEventArgs> Handler { get; }
/// <summary>The order in which the event handler was registered, relative to other handlers for this event.</summary>
public int RegistrationOrder { get; }
/// <summary>The event handler priority, relative to other handlers for this event.</summary>
public EventPriority Priority { get; }
/// <summary>The mod which registered the handler.</summary>
public IModMetadata SourceMod { get; set; }
/*********
** Accessors
*********/
/// <summary>Construct an instance.</summary>
/// <param name="handler">The event handler method.</param>
/// <param name="registrationOrder">The order in which the event handler was registered, relative to other handlers for this event.</param>
/// <param name="priority">The event handler priority, relative to other handlers for this event.</param>
/// <param name="sourceMod">The mod which registered the handler.</param>
public ManagedEventHandler(EventHandler<TEventArgs> handler, int registrationOrder, EventPriority priority, IModMetadata sourceMod)
{
this.Handler = handler;
this.RegistrationOrder = registrationOrder;
this.Priority = priority;
this.SourceMod = sourceMod;
}
/// <inheritdoc />
public int CompareTo(object obj)
{
if (!(obj is ManagedEventHandler<TEventArgs> other))
throw new ArgumentException("Can't compare to an unrelated object type.");
int priorityCompare = -this.Priority.CompareTo(other.Priority); // higher value = sort first
return priorityCompare != 0
? priorityCompare
: this.RegistrationOrder.CompareTo(other.RegistrationOrder);
}
}
}
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