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using System.Collections.Generic;
using Netcode;
namespace StardewModdingAPI.Framework.StateTracking.FieldWatchers
{
/// <summary>A watcher which detects changes to a Netcode collection.</summary>
/// <typeparam name="TValue">The value type within the collection.</typeparam>
internal class NetCollectionWatcher<TValue> : BaseDisposableWatcher, ICollectionWatcher<TValue>
where TValue : class, INetObject<INetSerializable>
{
/*********
** Fields
*********/
/// <summary>The field being watched.</summary>
private readonly NetCollection<TValue> Field;
/// <summary>The pairs added since the last reset.</summary>
private readonly List<TValue> AddedImpl = new();
/// <summary>The pairs removed since the last reset.</summary>
private readonly List<TValue> RemovedImpl = new();
/*********
** Accessors
*********/
/// <summary>Whether the collection changed since the last reset.</summary>
public bool IsChanged => this.AddedImpl.Count > 0 || this.RemovedImpl.Count > 0;
/// <summary>The values added since the last reset.</summary>
public IEnumerable<TValue> Added => this.AddedImpl;
/// <summary>The values removed since the last reset.</summary>
public IEnumerable<TValue> Removed => this.RemovedImpl;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="field">The field to watch.</param>
public NetCollectionWatcher(NetCollection<TValue> field)
{
this.Field = field;
field.OnValueAdded += this.OnValueAdded;
field.OnValueRemoved += this.OnValueRemoved;
}
/// <summary>Update the current value if needed.</summary>
public void Update()
{
this.AssertNotDisposed();
}
/// <summary>Set the current value as the baseline.</summary>
public void Reset()
{
this.AssertNotDisposed();
this.AddedImpl.Clear();
this.RemovedImpl.Clear();
}
/// <summary>Stop watching the field and release all references.</summary>
public override void Dispose()
{
if (!this.IsDisposed)
{
this.Field.OnValueAdded -= this.OnValueAdded;
this.Field.OnValueRemoved -= this.OnValueRemoved;
}
base.Dispose();
}
/*********
** Private methods
*********/
/// <summary>A callback invoked when an entry is added to the collection.</summary>
/// <param name="value">The added value.</param>
private void OnValueAdded(TValue value)
{
this.AddedImpl.Add(value);
}
/// <summary>A callback invoked when an entry is removed from the collection.</summary>
/// <param name="value">The added value.</param>
private void OnValueRemoved(TValue value)
{
this.RemovedImpl.Add(value);
}
}
}
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