using System.Collections.ObjectModel;

namespace NeonSprawl.Server.Game.Encounters;

/// <summary>In-memory encounter catalog loaded at startup (NEO-101). Game callers should use <see cref="IEncounterDefinitionRegistry"/> (NEO-102).</summary>
public sealed class EncounterDefinitionCatalog(
    string encountersDirectory,
    IReadOnlyDictionary<string, EncounterDefRow> byId,
    int catalogJsonFileCount)
{
    /// <summary>Absolute path to the directory that was enumerated for <c>*_encounters.json</c> catalogs.</summary>
    public string EncountersDirectory { get; } = encountersDirectory;

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

    public int DistinctEncounterCount => ById.Count;

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

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