using System;
using System.Runtime.CompilerServices;
using Xunit;
using XWorld.Framework;
using XWorld.Server.Host;

namespace XWorld.Server.Host.Tests
{
    public class AlcUnloadTests
    {
        private sealed class NullOutput : IRoomOutput
        {
            public void Broadcast(NetMessage m) { }
            public void SendTo(int playerId, NetMessage m) { }
        }

        // 在独立方法里加载/运行/卸载，确保局部强引用随方法返回而消失
        [MethodImpl(MethodImplOptions.NoInlining)]
        private static (WeakReference alc, WeakReference asm) LoadRunAndUnload()
        {
            var module = new GameModuleLoader().Load(TestGames.Root, "rps", 1);
            IGameServerRoom room = module.CreateRoom();
            room.OnRoomStart(
                new[]
                {
                    new PlayerInfo { PlayerId = 1, Name = "H", IsAI = false },
                    new PlayerInfo { PlayerId = -1, Name = "AI", IsAI = true },
                },
                new RoomCtx(new DeterministicRandom(1), new ManualClock(), new ConsoleLogger(),
                    new InMemoryStorage(), new NullOutput(), _ => { }));
            room.OnTick(1f); // dt=1 < 5s，仍在 Choosing，仅广播一次快照
            var asmWeak = new WeakReference(room.GetType().Assembly); // 游戏 ALC 内加载的程序集
            room = null;
            return (module.Unload(), asmWeak);
        }

        [Fact]
        public void GameModule_Unload_ReclaimsMemory()
        {
            var (alcWeak, asmWeak) = LoadRunAndUnload();
            for (int i = 0; i < 12 && (alcWeak.IsAlive || asmWeak.IsAlive); i++)
            {
                GC.Collect();
                GC.WaitForPendingFinalizers();
            }
            Assert.False(alcWeak.IsAlive, "游戏模块 ALC 未被回收 —— 存在泄漏引用");
            Assert.False(asmWeak.IsAlive, "游戏程序集未被回收 —— 存在泄漏引用");
        }
    }
}