using System.Collections.ObjectModel;

namespace NeonSprawl.Server.Game.Items;

/// <summary>In-memory item catalog loaded at startup (NEO-51). Game code should prefer injectable item registry for lookups (NEO-52).</summary>
public sealed class ItemDefinitionCatalog(
    string itemsDirectory,
    IReadOnlyDictionary<string, ItemDefRow> byId,
    int catalogJsonFileCount)
{

    /// <summary>Absolute path to the directory that was enumerated for <c>*_items.json</c> catalogs.</summary>
    public string ItemsDirectory { get; } = itemsDirectory;

    public IReadOnlyDictionary<string, ItemDefRow> ById { get; } = new ReadOnlyDictionary<string, ItemDefRow>(new Dictionary<string, ItemDefRow>(byId, StringComparer.Ordinal));

    public int DistinctItemCount => ById.Count;

    /// <summary>Number of <c>*_items.json</c> files under <see cref="ItemsDirectory"/>.</summary>
    public int CatalogJsonFileCount { get; } = catalogJsonFileCount;

    /// <summary>Resolves a catalog row by stable <paramref name="id"/>.</summary>
    public bool TryGetItem(string id, out ItemDefRow? row) =>
        ById.TryGetValue(id, out row);
}