using System;
using System.Threading.Tasks;
using ZB.MOM.WW.MxGateway.Contracts.Proto;
using ZB.MOM.WW.MxGateway.Worker.MxAccess;
using ZB.MOM.WW.MxGateway.Worker.Sta;
using ZB.MOM.WW.MxGateway.Worker.Tests.TestSupport;

namespace ZB.MOM.WW.MxGateway.Worker.Tests.MxAccess;

public sealed class MxAccessLiveComCreationTests
{
    private const string LiveClientName = "ZB.MOM.WW.MxGateway.Worker.Tests";
    private const string DefaultLiveAddItemReference = "TestChildObject.TestInt";
    private const string DefaultLiveAddItem2Definition = "TestInt";
    private const string DefaultLiveAddItem2Context = "TestChildObject";

    /// <summary>Verifies that StartAsync creates the installed MXAccess COM object on the STA thread when opted in.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [LiveMxAccessFact]
    public async Task StartAsync_WhenOptedIn_CreatesInstalledMxAccessComObjectOnSta()
    {
        using MxAccessStaSession session = new();

        await session.StartAsync(workerProcessId: 1234);
    }

    /// <summary>Verifies that Register and Unregister round-trip server handles with installed MXAccess.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [LiveMxAccessFact]
    public async Task RegisterAndUnregister_WhenOptedIn_RoundTripsInstalledMxAccessServerHandle()
    {
        using MxAccessStaSession session = new();
        await session.StartAsync(workerProcessId: 1234);

        MxCommandReply registerReply = await session.DispatchAsync(new StaCommand(
            "session-1",
            "live-register",
            new MxCommand
            {
                Kind = MxCommandKind.Register,
                Register = new RegisterCommand
                {
                    ClientName = LiveClientName,
                },
            }));

        Assert.Equal(ProtocolStatusCode.Ok, registerReply.ProtocolStatus.Code);
        Assert.True(registerReply.Register.ServerHandle > 0);

        MxCommandReply unregisterReply = await session.DispatchAsync(new StaCommand(
            "session-1",
            "live-unregister",
            new MxCommand
            {
                Kind = MxCommandKind.Unregister,
                Unregister = new UnregisterCommand
                {
                    ServerHandle = registerReply.Register.ServerHandle,
                },
            }));

        Assert.Equal(ProtocolStatusCode.Ok, unregisterReply.ProtocolStatus.Code);
    }

    /// <summary>Verifies that AddItem and RemoveItem round-trip item handles with installed MXAccess.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [LiveMxAccessFact]
    public async Task AddItemAndRemoveItem_WhenOptedIn_RoundTripsInstalledMxAccessItemHandle()
    {
        using MxAccessStaSession session = new();
        await session.StartAsync(workerProcessId: 1234);

        MxCommandReply registerReply = await RegisterLiveSessionAsync(session, "live-add-register");
        int serverHandle = registerReply.Register.ServerHandle;
        int itemHandle = 0;

        try
        {
            MxCommandReply addItemReply = await session.DispatchAsync(new StaCommand(
                "session-1",
                "live-add-item",
                new MxCommand
                {
                    Kind = MxCommandKind.AddItem,
                    AddItem = new AddItemCommand
                    {
                        ServerHandle = serverHandle,
                        ItemDefinition = GetLiveAddItemReference(),
                    },
                }));

            Assert.Equal(ProtocolStatusCode.Ok, addItemReply.ProtocolStatus.Code);
            Assert.True(addItemReply.AddItem.ItemHandle > 0);
            itemHandle = addItemReply.AddItem.ItemHandle;

            MxCommandReply removeItemReply = await session.DispatchAsync(new StaCommand(
                "session-1",
                "live-remove-item",
                new MxCommand
                {
                    Kind = MxCommandKind.RemoveItem,
                    RemoveItem = new RemoveItemCommand
                    {
                        ServerHandle = serverHandle,
                        ItemHandle = itemHandle,
                    },
                }));

            Assert.Equal(ProtocolStatusCode.Ok, removeItemReply.ProtocolStatus.Code);
            itemHandle = 0;
        }
        finally
        {
            if (itemHandle > 0)
            {
                await session.DispatchAsync(new StaCommand(
                    "session-1",
                    "live-remove-item-cleanup",
                    new MxCommand
                    {
                        Kind = MxCommandKind.RemoveItem,
                        RemoveItem = new RemoveItemCommand
                        {
                            ServerHandle = serverHandle,
                            ItemHandle = itemHandle,
                        },
                    }));
            }

            await UnregisterLiveSessionAsync(session, serverHandle, "live-add-unregister");
        }
    }

    /// <summary>Verifies that AddItem2 and RemoveItem preserve item context with installed MXAccess.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [LiveMxAccessFact]
    public async Task AddItem2AndRemoveItem_WhenOptedIn_PreservesContextForInstalledMxAccess()
    {
        using MxAccessStaSession session = new();
        await session.StartAsync(workerProcessId: 1234);

        MxCommandReply registerReply = await RegisterLiveSessionAsync(session, "live-add2-register");
        int serverHandle = registerReply.Register.ServerHandle;
        int itemHandle = 0;

        try
        {
            MxCommandReply addItem2Reply = await session.DispatchAsync(new StaCommand(
                "session-1",
                "live-add-item2",
                new MxCommand
                {
                    Kind = MxCommandKind.AddItem2,
                    AddItem2 = new AddItem2Command
                    {
                        ServerHandle = serverHandle,
                        ItemDefinition = DefaultLiveAddItem2Definition,
                        ItemContext = DefaultLiveAddItem2Context,
                    },
                }));

            Assert.Equal(ProtocolStatusCode.Ok, addItem2Reply.ProtocolStatus.Code);
            Assert.True(addItem2Reply.AddItem2.ItemHandle > 0);
            itemHandle = addItem2Reply.AddItem2.ItemHandle;

            MxCommandReply removeItemReply = await session.DispatchAsync(new StaCommand(
                "session-1",
                "live-remove-item2",
                new MxCommand
                {
                    Kind = MxCommandKind.RemoveItem,
                    RemoveItem = new RemoveItemCommand
                    {
                        ServerHandle = serverHandle,
                        ItemHandle = itemHandle,
                    },
                }));

            Assert.Equal(ProtocolStatusCode.Ok, removeItemReply.ProtocolStatus.Code);
            itemHandle = 0;
        }
        finally
        {
            if (itemHandle > 0)
            {
                await session.DispatchAsync(new StaCommand(
                    "session-1",
                    "live-remove-item2-cleanup",
                    new MxCommand
                    {
                        Kind = MxCommandKind.RemoveItem,
                        RemoveItem = new RemoveItemCommand
                        {
                            ServerHandle = serverHandle,
                            ItemHandle = itemHandle,
                        },
                    }));
            }

            await UnregisterLiveSessionAsync(session, serverHandle, "live-add2-unregister");
        }
    }

    /// <summary>Verifies that Advise and UnAdvise round-trip subscriptions with installed MXAccess.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [LiveMxAccessFact]
    public async Task AdviseAndUnAdvise_WhenOptedIn_RoundTripsInstalledMxAccessSubscription()
    {
        using MxAccessStaSession session = new();
        await session.StartAsync(workerProcessId: 1234);

        MxCommandReply registerReply = await RegisterLiveSessionAsync(session, "live-advise-register");
        int serverHandle = registerReply.Register.ServerHandle;
        int itemHandle = 0;
        bool advised = false;

        try
        {
            MxCommandReply addItemReply = await session.DispatchAsync(new StaCommand(
                "session-1",
                "live-advise-add-item",
                new MxCommand
                {
                    Kind = MxCommandKind.AddItem,
                    AddItem = new AddItemCommand
                    {
                        ServerHandle = serverHandle,
                        ItemDefinition = GetLiveAddItemReference(),
                    },
                }));

            Assert.Equal(ProtocolStatusCode.Ok, addItemReply.ProtocolStatus.Code);
            Assert.True(addItemReply.AddItem.ItemHandle > 0);
            itemHandle = addItemReply.AddItem.ItemHandle;

            MxCommandReply adviseReply = await session.DispatchAsync(new StaCommand(
                "session-1",
                "live-advise",
                new MxCommand
                {
                    Kind = MxCommandKind.Advise,
                    Advise = new AdviseCommand
                    {
                        ServerHandle = serverHandle,
                        ItemHandle = itemHandle,
                    },
                }));

            Assert.Equal(ProtocolStatusCode.Ok, adviseReply.ProtocolStatus.Code);
            advised = true;

            MxCommandReply unAdviseReply = await session.DispatchAsync(new StaCommand(
                "session-1",
                "live-unadvise",
                new MxCommand
                {
                    Kind = MxCommandKind.UnAdvise,
                    UnAdvise = new UnAdviseCommand
                    {
                        ServerHandle = serverHandle,
                        ItemHandle = itemHandle,
                    },
                }));

            Assert.Equal(ProtocolStatusCode.Ok, unAdviseReply.ProtocolStatus.Code);
            advised = false;

            MxCommandReply removeItemReply = await session.DispatchAsync(new StaCommand(
                "session-1",
                "live-advise-remove-item",
                new MxCommand
                {
                    Kind = MxCommandKind.RemoveItem,
                    RemoveItem = new RemoveItemCommand
                    {
                        ServerHandle = serverHandle,
                        ItemHandle = itemHandle,
                    },
                }));

            Assert.Equal(ProtocolStatusCode.Ok, removeItemReply.ProtocolStatus.Code);
            itemHandle = 0;
        }
        finally
        {
            if (advised && itemHandle > 0)
            {
                await session.DispatchAsync(new StaCommand(
                    "session-1",
                    "live-unadvise-cleanup",
                    new MxCommand
                    {
                        Kind = MxCommandKind.UnAdvise,
                        UnAdvise = new UnAdviseCommand
                        {
                            ServerHandle = serverHandle,
                            ItemHandle = itemHandle,
                        },
                    }));
            }

            if (itemHandle > 0)
            {
                await session.DispatchAsync(new StaCommand(
                    "session-1",
                    "live-advise-remove-item-cleanup",
                    new MxCommand
                    {
                        Kind = MxCommandKind.RemoveItem,
                        RemoveItem = new RemoveItemCommand
                        {
                            ServerHandle = serverHandle,
                            ItemHandle = itemHandle,
                        },
                    }));
            }

            await UnregisterLiveSessionAsync(session, serverHandle, "live-advise-unregister");
        }
    }

    private static string GetLiveAddItemReference()
    {
        string itemReference = Environment.GetEnvironmentVariable("MXGATEWAY_LIVE_MXACCESS_ITEM");

        return string.IsNullOrWhiteSpace(itemReference)
            ? DefaultLiveAddItemReference
            : itemReference;
    }

    private static async Task<MxCommandReply> RegisterLiveSessionAsync(
        MxAccessStaSession session,
        string correlationId)
    {
        MxCommandReply reply = await session.DispatchAsync(new StaCommand(
            "session-1",
            correlationId,
            new MxCommand
            {
                Kind = MxCommandKind.Register,
                Register = new RegisterCommand
                {
                    ClientName = LiveClientName,
                },
            }));

        Assert.Equal(ProtocolStatusCode.Ok, reply.ProtocolStatus.Code);
        Assert.True(reply.Register.ServerHandle > 0);

        return reply;
    }

    private static async Task UnregisterLiveSessionAsync(
        MxAccessStaSession session,
        int serverHandle,
        string correlationId)
    {
        MxCommandReply unregisterReply = await session.DispatchAsync(new StaCommand(
            "session-1",
            correlationId,
            new MxCommand
            {
                Kind = MxCommandKind.Unregister,
                Unregister = new UnregisterCommand
                {
                    ServerHandle = serverHandle,
                },
            }));

        Assert.Equal(ProtocolStatusCode.Ok, unregisterReply.ProtocolStatus.Code);
    }
}