using System.Diagnostics.CodeAnalysis;

namespace NeonSprawl.Server.Game.Encounters;

/// <summary>Adapter over <see cref="EncounterDefinitionCatalog"/> (NEO-102).</summary>
public sealed class EncounterDefinitionRegistry(EncounterDefinitionCatalog catalog) : IEncounterDefinitionRegistry
{
    private readonly IReadOnlyList<EncounterDefRow> _definitionsInIdOrder = BuildDefinitionsInIdOrder(catalog);

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

        return catalog.TryGetEncounter(encounterId, out definition);
    }

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

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

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

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

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

        return list;
    }
}