using System.Collections.ObjectModel;

namespace NeonSprawl.Server.Game.Npc;

/// <summary>In-memory NPC behavior catalog loaded at startup (NEO-88). Game callers should use <see cref="INpcBehaviorDefinitionRegistry"/>.</summary>
public sealed class NpcBehaviorDefinitionCatalog(
    string npcBehaviorsDirectory,
    IReadOnlyDictionary<string, NpcBehaviorDefRow> byId,
    int catalogJsonFileCount)
{
    /// <summary>Absolute path to the directory that was enumerated for <c>*_npc_behaviors.json</c> catalogs.</summary>
    public string NpcBehaviorsDirectory { get; } = npcBehaviorsDirectory;

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

    public int DistinctBehaviorCount => ById.Count;

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

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