InventoryTransaction.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace RPGCore.Inventory.Slots;

/// <summary>
/// <para>Represents a tranfer of items between inventories.</para>
/// </summary>
/// <remarks>
/// <para>When a game client wants to move items from one inventory to another, they construct their desired transaction.</para>
/// <para>A transaction can consist of adding, removing, moving or destroying items.</para>
/// </remarks>
public class InventoryTransaction : IEquatable<InventoryTransaction>
{
	public static readonly InventoryTransaction None = new(TransactionStatus.None, Array.Empty<ItemTransaction>());

	public TransactionStatus Status { get; set; }
	public IReadOnlyList<ItemTransaction> Items { get; set; }

	public InventoryTransaction()
	{
	}

	public InventoryTransaction(TransactionStatus status, IReadOnlyList<ItemTransaction> items)
	{
		Status = status;
		Items = items;
	}

	/// <inheritdoc/>
	public override bool Equals(object obj)
	{
		return Equals(obj as InventoryTransaction);
	}

	public bool Equals(InventoryTransaction other)
	{
		if (Status != other.Status)
		{
			return false;
		}

		if ((Items?.Count ?? 0) != (other.Items?.Count ?? 0))
		{
			return false;
		}

		for (int i = 0; i < Items.Count; i++)
		{
			var thisItem = Items[i];
			var otherItem = other.Items[i];

			if (thisItem != otherItem)
			{
				return false;
			}
		}

		return true;
	}

	/// <inheritdoc/>
	public override int GetHashCode()
	{
		int hashCode = 2143614870;
		hashCode = hashCode * -1521134295 + Status.GetHashCode();
		hashCode = hashCode * -1521134295 + EqualityComparer<IReadOnlyList<ItemTransaction>>.Default.GetHashCode(Items);
		return hashCode;
	}

	/// <inheritdoc/>
	public override string ToString()
	{
		var sb = new StringBuilder();

		sb.Append(nameof(InventoryTransaction));
		sb.Append("(");
		sb.Append("Status: ");
		sb.Append(Status.ToString());
		sb.Append(", [");

		for (int i = 0; i < Items.Count; i++)
		{
			sb.Append(Items[i]);

			if (i != Items.Count - 1)
			{
				sb.Append(", ");
			}
		}

		sb.Append("])");

		return sb.ToString();
	}

	public static bool operator ==(InventoryTransaction left, InventoryTransaction right)
	{
		return EqualityComparer<InventoryTransaction>.Default.Equals(left, right);
	}

	public static bool operator !=(InventoryTransaction left, InventoryTransaction right)
	{
		return !(left == right);
	}
}