namespace NeonSprawl.Server.Game.PositionState;

/// <summary>Configured player ids seeded at host start (dev player + Bruno/manual QA fixtures).</summary>
public static class GamePlayerSeed
{
    /// <summary>Distinct normalized player ids from <see cref="GamePositionOptions.DevPlayerId"/> and <see cref="GamePositionOptions.FixturePlayerIds"/>.</summary>
    public static IReadOnlyList<string> GetSeedPlayerIds(GamePositionOptions options)
    {
        var seen = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
        var list = new List<string>();
        Add(options.DevPlayerId, seen, list);
        foreach (var id in options.FixturePlayerIds)
        {
            Add(id, seen, list);
        }

        return list;
    }

    private static void Add(string? raw, HashSet<string> seen, List<string> list)
    {
        var t = raw?.Trim();
        if (string.IsNullOrEmpty(t) || !seen.Add(t))
        {
            return;
        }

        list.Add(t);
    }
}