// src/AcDream.Core/Plugins/WorldGameState.cs
using AcDream.Plugin.Abstractions;

namespace AcDream.Core.Plugins;

public sealed class WorldGameState : IGameState
{
    private readonly List<WorldEntitySnapshot> _entities = new();

    public IReadOnlyList<WorldEntitySnapshot> Entities => _entities;

    /// <summary>Called by the host as each entity is hydrated.</summary>
    public void Add(WorldEntitySnapshot snapshot) => _entities.Add(snapshot);

    /// <summary>
    /// Remove any snapshot with the given local <c>Id</c>. Used when the
    /// server re-sends <c>CreateObject</c> for an entity already known to
    /// acdream — the host deletes the old snapshot before adding the new
    /// one so plugins don't see stale duplicates.
    /// </summary>
    public void RemoveById(uint id) => _entities.RemoveAll(e => e.Id == id);
}