using System.Diagnostics.CodeAnalysis;

namespace NeonSprawl.Server.Game.Npc;

/// <summary>Adapter over <see cref="NpcBehaviorDefinitionCatalog"/> (NEO-89).</summary>
public sealed class NpcBehaviorDefinitionRegistry(NpcBehaviorDefinitionCatalog catalog) : INpcBehaviorDefinitionRegistry
{
    private readonly IReadOnlyList<NpcBehaviorDefRow> _definitionsInIdOrder = BuildDefinitionsInIdOrder(catalog);

    /// <inheritdoc />
    public bool TryGetDefinition(string? behaviorId, [NotNullWhen(true)] out NpcBehaviorDefRow? definition)
    {
        if (behaviorId is null)
        {
            definition = null;
            return false;
        }

        return catalog.TryGetBehavior(behaviorId, out definition);
    }

    /// <inheritdoc />
    public bool TryNormalizeKnown(string? rawBehaviorId, [NotNullWhen(true)] out string normalized)
    {
        if (rawBehaviorId is null)
        {
            normalized = string.Empty;
            return false;
        }

        normalized = rawBehaviorId.Trim().ToLowerInvariant();
        if (normalized.Length == 0)
        {
            normalized = string.Empty;
            return false;
        }

        return catalog.TryGetBehavior(normalized, out _);
    }

    /// <inheritdoc />
    public IReadOnlyList<NpcBehaviorDefRow> GetDefinitionsInIdOrder() => _definitionsInIdOrder;

    private static IReadOnlyList<NpcBehaviorDefRow> BuildDefinitionsInIdOrder(NpcBehaviorDefinitionCatalog catalog)
    {
        string[] ids = [.. catalog.ById.Keys.OrderBy(k => k, StringComparer.Ordinal)];
        var list = new List<NpcBehaviorDefRow>(ids.Length);
        foreach (var id in ids)
        {
            list.Add(catalog.ById[id]);
        }

        return list;
    }
}