using System.Collections.ObjectModel;

namespace NeonSprawl.Server.Game.Encounters;

/// <summary>In-memory reward-table catalog loaded at startup (NEO-101). Game callers should use <see cref="IRewardTableDefinitionRegistry"/> (NEO-102).</summary>
public sealed class RewardTableDefinitionCatalog(
    string rewardTablesDirectory,
    IReadOnlyDictionary<string, RewardTableDefRow> byId,
    int catalogJsonFileCount)
{
    /// <summary>Absolute path to the directory that was enumerated for <c>*_reward_tables.json</c> catalogs.</summary>
    public string RewardTablesDirectory { get; } = rewardTablesDirectory;

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

    public int DistinctRewardTableCount => ById.Count;

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

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