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using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using StardewModdingAPI.Events;
using StardewValley;
namespace StardewModdingAPI.Framework
{
/// <summary>A snapshot of a tracked item list.</summary>
internal class SnapshotItemListDiff
{
/*********
** Accessors
*********/
/// <summary>Whether the item list changed.</summary>
public bool IsChanged { get; }
/// <summary>The removed values.</summary>
public Item[] Removed { get; }
/// <summary>The added values.</summary>
public Item[] Added { get; }
/// <summary>The items whose stack sizes changed.</summary>
public ItemStackSizeChange[] QuantityChanged { get; }
/*********
** Public methods
*********/
/// <summary>Update the snapshot.</summary>
/// <param name="added">The added values.</param>
/// <param name="removed">The removed values.</param>
/// <param name="sizesChanged">The items whose stack sizes changed.</param>
public SnapshotItemListDiff(Item[] added, Item[] removed, ItemStackSizeChange[] sizesChanged)
{
this.Removed = removed;
this.Added = added;
this.QuantityChanged = sizesChanged;
this.IsChanged = removed.Length > 0 || added.Length > 0 || sizesChanged.Length > 0;
}
/// <summary>Get a snapshot diff if anything changed in the given data.</summary>
/// <param name="added">The added item stacks.</param>
/// <param name="removed">The removed item stacks.</param>
/// <param name="stackSizes">The items with their previous stack sizes.</param>
/// <param name="changes">The inventory changes, or <c>null</c> if nothing changed.</param>
/// <returns>Returns whether anything changed.</returns>
public static bool TryGetChanges(ISet<Item> added, ISet<Item> removed, IDictionary<Item, int> stackSizes, [NotNullWhen(true)] out SnapshotItemListDiff? changes)
{
KeyValuePair<Item, int>[] sizesChanged = stackSizes.Where(p => p.Key.Stack != p.Value).ToArray();
if (sizesChanged.Any() || added.Any() || removed.Any())
{
changes = new SnapshotItemListDiff(
added: added.ToArray(),
removed: removed.ToArray(),
sizesChanged: sizesChanged.Select(p => new ItemStackSizeChange(p.Key, p.Value, p.Key.Stack)).ToArray()
);
return true;
}
changes = null;
return false;
}
}
}
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