using System.Runtime.CompilerServices;
using AcDream.App.Net;
using AcDream.App.UI;
using AcDream.Core.Chat;
using AcDream.Core.Social;
using AcDream.UI.Abstractions;

namespace AcDream.App.Tests.Net;

public sealed class LiveSessionCommandRouterTests
{
    [Fact]
    public void InactiveAndDisposedRouter_CannotReachTransport()
    {
        var sent = new List<string>();
        var router = NewRouter(sendTalk: sent.Add);

        router.Publish(new SendServerCommandCmd("@before"));
        router.Activate();
        router.Activate();
        router.Publish(new SendServerCommandCmd("@active"));
        router.Dispose();
        router.Dispose();
        router.Publish(new SendServerCommandCmd("@after"));

        Assert.Equal(["@active"], sent);
        Assert.False(router.IsActive);
    }

    [Fact]
    public void TellAndLegacyChannel_PreserveOutboundAndEchoPolicy()
    {
        var tells = new List<(string Target, string Text)>();
        var channels = new List<(uint Id, string Text)>();
        var chat = new ChatLog();
        var router = NewRouter(
            chat: chat,
            sendTell: (target, text) => tells.Add((target, text)),
            sendChannel: (id, text) => channels.Add((id, text)));
        router.Activate();

        router.Publish(new SendChatCmd(ChatChannelKind.Tell, "Friend", "hello"));
        router.Publish(new SendChatCmd(ChatChannelKind.Fellowship, null, "group"));

        Assert.Equal([("Friend", "hello")], tells);
        Assert.Equal([(0x00000800u, "group")], channels);
        Assert.Collection(
            chat.Snapshot(),
            entry =>
            {
                Assert.Equal(ChatKind.Tell, entry.Kind);
                Assert.Equal("Friend", entry.Sender);
            },
            entry =>
            {
                Assert.Equal(ChatKind.Channel, entry.Kind);
                Assert.Equal("Fellowship", entry.ChannelName);
            });
    }

    [Fact]
    public void TurbineChannel_UsesRuntimeRoomCookieAndNoOptimisticEcho()
    {
        var turbine = new TurbineChatState();
        turbine.OnChannelsReceived(
            allegianceRoom: 0u,
            generalRoom: 0x70000001u,
            tradeRoom: 0u,
            lfgRoom: 0u,
            roleplayRoom: 0u,
            olthoiRoom: 0u,
            societyRoom: 0u,
            societyCelestialHandRoom: 0u,
            societyEldrytchWebRoom: 0u,
            societyRadiantBloodRoom: 0u);
        var sent = new List<(uint Room, uint Type, uint Dispatch, uint Sender, string Text, uint Cookie)>();
        var chat = new ChatLog();
        var router = NewRouter(
            chat: chat,
            turbine: turbine,
            playerGuid: () => 0x50000001u,
            sendTurbine: (room, type, dispatch, sender, text, cookie) =>
                sent.Add((room, type, dispatch, sender, text, cookie)));
        router.Activate();

        router.Publish(new SendChatCmd(ChatChannelKind.General, null, "world"));

        Assert.Collection(sent, message =>
        {
            Assert.Equal(0x70000001u, message.Room);
            Assert.Equal(0x02u, message.Type);
            Assert.Equal(0x02u, message.Dispatch);
            Assert.Equal(0x50000001u, message.Sender);
            Assert.Equal("world", message.Text);
            Assert.Equal(1u, message.Cookie);
        });
        Assert.Equal(0, chat.Count);
    }

    [Fact]
    public void ActivateAfterDispose_IsRejected()
    {
        var router = NewRouter();
        router.Dispose();

        Assert.Throws<ObjectDisposedException>(router.Activate);
    }

    [Fact]
    public async Task ConcurrentDispose_WaitsForInFlightTransportThenMakesRouterInert()
    {
        using var sendEntered = new ManualResetEventSlim();
        using var releaseSend = new ManualResetEventSlim();
        var sent = new List<string>();
        var router = NewRouter(sendTalk: text =>
        {
            sendEntered.Set();
            releaseSend.Wait();
            sent.Add(text);
        });
        router.Activate();

        Task publish = Task.Run(() =>
            router.Publish(new SendServerCommandCmd("@active")));
        Assert.True(sendEntered.Wait(TimeSpan.FromSeconds(5)));
        using var disposeStarted = new ManualResetEventSlim();
        Task dispose = Task.Run(() =>
        {
            disposeStarted.Set();
            router.Dispose();
        });
        Assert.True(disposeStarted.Wait(TimeSpan.FromSeconds(5)));
        Task firstCompletion = await Task.WhenAny(
            dispose,
            Task.Delay(TimeSpan.FromMilliseconds(100)));
        Assert.NotSame(dispose, firstCompletion);

        releaseSend.Set();
        await Task.WhenAll(publish, dispose);
        router.Publish(new SendServerCommandCmd("@after"));

        Assert.Equal(["@active"], sent);
        Assert.False(router.IsActive);
    }

    [Fact]
    public void ReentrantDisposeFromLog_PreventsLaterTransportAndEcho()
    {
        var turbine = new TurbineChatState();
        turbine.OnChannelsReceived(
            0u, 0x70000001u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u);
        var sent = new List<string>();
        var chat = new ChatLog();
        LiveSessionCommandRouter? router = null;
        router = NewRouter(
            chat: chat,
            turbine: turbine,
            sendTurbine: (_, _, _, _, text, _) => sent.Add(text),
            log: _ => router!.Dispose());
        router.Activate();

        router.Publish(new SendChatCmd(ChatChannelKind.General, null, "world"));

        Assert.Empty(sent);
        Assert.Equal(0, chat.Count);
        Assert.False(router.IsActive);
    }

    [Fact]
    public void RetainedDisposedRouter_ReleasesCapturedTransportGraph()
    {
        (LiveSessionCommandRouter router, WeakReference<object> transport) =
            CreateRouterWithCapturedTransport();

        router.Dispose();
        ForceFullCollection();

        Assert.False(transport.TryGetTarget(out _));
        GC.KeepAlive(router);
    }

    [Fact]
    public void DelayedConfirmationCallback_ReleasesTransportAndBecomesInert()
    {
        (LiveSessionCommandRouter router, WeakReference<object> transport, Action<bool> callback) =
            CreateRouterWithDelayedConfirmation();

        router.Dispose();
        ForceFullCollection();

        Assert.False(transport.TryGetTarget(out _));
        callback(true);
        Assert.False(router.IsActive);
        GC.KeepAlive(callback);
        GC.KeepAlive(router);
    }

    private static LiveSessionCommandRouter NewRouter(
        ChatLog? chat = null,
        TurbineChatState? turbine = null,
        Func<uint>? playerGuid = null,
        Action<string>? sendTalk = null,
        Action<string, string>? sendTell = null,
        Action<uint, string>? sendChannel = null,
        Action<uint, uint, uint, uint, string, uint>? sendTurbine = null,
        Action<string>? log = null,
        ClientCommandController.Bindings? clientBindings = null) => new(
        new LiveSessionCommandBindings(
            clientBindings ?? NewClientBindings(),
            chat ?? new ChatLog(),
            turbine ?? new TurbineChatState(),
            playerGuid ?? (() => 0u),
            sendTalk ?? (_ => { }),
            sendTell ?? ((_, _) => { }),
            sendChannel ?? ((_, _) => { }),
            sendTurbine ?? ((_, _, _, _, _, _) => { }),
            log));

    [MethodImpl(MethodImplOptions.NoInlining)]
    private static (LiveSessionCommandRouter, WeakReference<object>)
        CreateRouterWithCapturedTransport()
    {
        object transport = new object();
        var weak = new WeakReference<object>(transport);
        var router = NewRouter(sendTalk: _ => GC.KeepAlive(transport));
        return (router, weak);
    }

    [MethodImpl(MethodImplOptions.NoInlining)]
    private static (LiveSessionCommandRouter, WeakReference<object>, Action<bool>)
        CreateRouterWithDelayedConfirmation()
    {
        object transport = new object();
        var weak = new WeakReference<object>(transport);
        Action<bool>? callback = null;
        ClientCommandController.Bindings bindings = NewClientBindings() with
        {
            ShowConfirmation = (_, completion) => callback = completion,
            Suicide = () => GC.KeepAlive(transport),
        };
        var router = NewRouter(clientBindings: bindings);
        router.Activate();
        router.Publish(new ExecuteClientCommandCmd(ClientCommandId.Die, string.Empty));
        return (router, weak, Assert.IsType<Action<bool>>(callback));
    }

    [MethodImpl(MethodImplOptions.NoInlining)]
    private static void ForceFullCollection()
    {
        GC.Collect();
        GC.WaitForPendingFinalizers();
        GC.Collect();
    }

    private static ClientCommandController.Bindings NewClientBindings() => new(
        TeleportToLifestone: () => { },
        TeleportToMarketplace: () => { },
        TeleportToPkArena: () => { },
        TeleportToPkLiteArena: () => { },
        TeleportToHouse: () => { },
        TeleportToMansion: () => { },
        QueryAge: () => { },
        QueryBirth: () => { },
        ToggleFrameRate: () => { },
        ToggleUiLock: () => { },
        ShowSystemMessage: _ => { },
        ShowWeenieError: _ => { },
        PlayerPublicWeenieBitfield: () => null,
        ClientVersion: () => "test",
        CurrentPosition: () => null,
        LastOutsideCorpsePosition: () => null,
        ShowConfirmation: (_, _) => { },
        Suicide: () => { },
        ClearChat: _ => { },
        SaveUi: _ => { },
        LoadUi: _ => { },
        SaveAutoUi: () => { },
        LoadAutoUi: () => { },
        IsAway: () => false,
        SetAway: _ => { },
        SetAwayMessage: _ => { },
        AcceptLootPermits: () => false,
        SetAcceptLootPermits: _ => { },
        DisplayConsent: () => { },
        ClearConsent: () => { },
        RemoveConsent: _ => { },
        SendEmote: _ => { },
        Friends: new FriendsState(),
        AddFriend: _ => { },
        RemoveFriend: _ => { },
        ClearFriends: () => { },
        RequestLegacyFriends: () => { },
        Squelch: new SquelchState(),
        ModifyCharacterSquelch: (_, _, _, _) => { },
        ModifyAccountSquelch: (_, _) => { },
        ModifyGlobalSquelch: (_, _) => { },
        LastTeller: () => null,
        ClearDesiredComponents: () => { },
        HasOpenVendor: () => false,
        FillComponentBuyList: (_, _) => { });
}