using FinalFactory.Rendezvous.Client;
using FinalFactory.Rendezvous.Contracts;
using FinalFactory.Rendezvous.Server.Abuse;
using FinalFactory.Rendezvous.Server.Browser;
using FinalFactory.Rendezvous.Server.Http;
using FinalFactory.Rendezvous.Server.Provisioning;
using FinalFactory.Rendezvous.Server.Sessions;
using FinalFactory.Rendezvous.Server.State;
using FinalFactory.Rendezvous.Tests.Provisioning;
using FinalFactory.Rendezvous.Tests.State;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Hosting.Server;
using Microsoft.AspNetCore.Hosting.Server.Features;
using Microsoft.AspNetCore.Routing;
using Microsoft.Extensions.DependencyInjection;

namespace FinalFactory.Rendezvous.Tests.Client;

public sealed class RendezvousClientIntegrationTests
{
    [Fact]
    public async Task PublisherAndBrowserClientsCompleteTheRealSessionLifecycleAndPaging()
    {
        await using ClientTestHost host = await ClientTestHost.StartAsync();
        RendezvousPublisherClient publisher = new(host.HttpClient);
        RendezvousSessionBrowserClient browser = new(host.HttpClient);
        List<PublishedSession> sessions = [];

        for (int index = 0; index < 3; index++)
        {
            RendezvousClientResult<PublishedSession> registered = await publisher.RegisterAsync(
                CreateRegistration(index),
                host.PublisherCredential);
            PublishedSession session = AssertSuccess(registered);
            sessions.Add(session);
            Assert.True(host.Capabilities.TryFingerprint(
                session.HostPresenceCapability,
                out SecretFingerprint fingerprint));
            StoreResult<StoredListing> bound = host.Store.BindHostPresence(new(
                session.HostPresenceHandle,
                fingerprint,
                new(AddressFamilyKind.Ipv4, $"203.0.113.{80 + index}", 41_000 + index),
                null));
            Assert.Equal(StoreResultCode.Success, bound.Code);
        }

        PublishedSession first = sessions[0];
        RendezvousClientResult<RenewLeaseResponse> renewed = await publisher.RenewAsync(
            first,
            host.PublisherCredential);
        Assert.True(renewed.IsSuccess, renewed.Message);
        Assert.Equal(renewed.Value!.ExpiresAt, first.ExpiresAt);

        UpdateSessionRequest update = new()
        {
            BuildVersion = "2.0.0",
            DisplayName = "SDK host updated",
            Capacity = new() { CurrentPlayers = 2, MaximumPlayers = 8 },
            Metadata = new() { ["mode"] = "online-coop" },
        };
        RendezvousClientResult<bool> updated = await publisher.UpdateAsync(
            first,
            update,
            host.PublisherCredential);
        Assert.True(updated.IsSuccess, updated.Message);

        BrowseSessionsRequest browseRequest = new()
        {
            GameId = new("space-game"),
            EnvironmentId = new("production"),
            RegionId = new("eu-central"),
            ProtocolVersion = 7,
            PageSize = 1,
            ExcludeFull = true,
        };
        IReadOnlyList<SessionListing> listings = AssertSuccess(
            await browser.BrowseAllAsync(browseRequest));
        Assert.Equal(3, listings.Count);
        Assert.Equal("SDK host updated", listings.Single(item => item.ListingId == first.ListingId).DisplayName);

        GetSessionResponse direct = AssertSuccess(await browser.GetAsync(
            first.ListingId,
            new("space-game"),
            new("production"),
            7));
        Assert.Equal("2.0.0", direct.Session.BuildVersion);

        foreach (PublishedSession session in sessions)
        {
            RendezvousClientResult<bool> deregistered = await publisher.DeregisterAsync(
                session,
                host.PublisherCredential);
            Assert.True(deregistered.IsSuccess, deregistered.Message);
            Assert.Equal(StoreResultCode.NotFound, host.Store.GetListing(session.ListingId, false).Code);
        }
    }

    private static T AssertSuccess<T>(RendezvousClientResult<T> result)
    {
        Assert.True(result.IsSuccess, result.Message);
        return Assert.IsAssignableFrom<T>(result.Value);
    }

    private static RegisterSessionRequest CreateRegistration(int index) => new()
    {
        IdempotencyKey = $"sdk-integration-{index}",
        GameId = new("space-game"),
        EnvironmentId = new("production"),
        RegionId = new("eu-central"),
        ProtocolVersion = 7,
        BuildVersion = "1.0.0",
        DisplayName = $"SDK host {index}",
        Visibility = ListingVisibility.Public,
        Capacity = new() { CurrentPlayers = 1, MaximumPlayers = 8 },
        Metadata = new() { ["mode"] = "online-coop" },
    };

    private sealed class ClientTestHost : IAsyncDisposable
    {
        private readonly WebApplication _application;

        private ClientTestHost(
            WebApplication application,
            HttpClient httpClient,
            InMemoryEphemeralRendezvousStore store,
            EphemeralCapabilityIssuer capabilities,
            string publisherCredential)
        {
            _application = application;
            HttpClient = httpClient;
            Store = store;
            Capabilities = capabilities;
            PublisherCredential = publisherCredential;
        }

        internal HttpClient HttpClient { get; }
        internal InMemoryEphemeralRendezvousStore Store { get; }
        internal EphemeralCapabilityIssuer Capabilities { get; }
        internal string PublisherCredential { get; }

        internal static async Task<ClientTestHost> StartAsync()
        {
            ManualRendezvousClock clock = new(ProvisioningTestData.Now);
            EphemeralStoreOptions stateOptions = new();
            InMemoryEphemeralRendezvousStore store = new(stateOptions, clock, clock);
            EphemeralCapabilityIssuer capabilities = new();
            ProvisioningRuntime provisioning = ProvisioningRuntime.Create(
                ProvisioningTestData.CreateOptions(),
                ProvisioningTestData.CreateSecrets("secret-1"),
                clock.UtcNow);
            DedicatedPublisherPrincipal principal = ProvisioningTestData.CreateDedicatedPublisher();
            string credential = provisioning.Credentials.Issue(principal, clock.UtcNow);

            WebApplicationBuilder builder = WebApplication.CreateBuilder();
            builder.WebHost.UseUrls("http://127.0.0.1:0");
            builder.Services.ConfigureHttpJsonOptions(static options =>
                ContractJson.Configure(options.SerializerOptions));
            builder.Services.Configure<RouteHandlerOptions>(static options =>
                options.ThrowOnBadRequest = true);
            builder.Services.AddProblemDetails();
            builder.Services.AddExceptionHandler<RendezvousExceptionHandler>();
            builder.Services.AddOptions<AbuseProtectionOptions>();
            builder.Services.AddSingleton<AbuseProtectionService>();
            builder.Services.AddSingleton(provisioning);
            builder.Services.AddSingleton(provisioning.Credentials);
            builder.Services.AddSingleton(provisioning.PublisherAuthorization);
            builder.Services.AddSingleton<IEphemeralRendezvousStore>(store);
            builder.Services.AddSingleton<IWallClock>(clock);
            builder.Services.AddSingleton(capabilities);
            builder.Services.AddSingleton<ISessionCapabilityService>(capabilities);
            builder.Services.AddSingleton(SessionLeaseTiming.From(stateOptions));
            builder.Services.AddSingleton<SessionLeaseService>();
            builder.Services.AddSingleton<SessionBrowserCursorCodec>();
            builder.Services.AddSingleton<SessionBrowserService>();

            WebApplication app = builder.Build();
            app.UseExceptionHandler();
            app.UseMiddleware<HttpAbuseProtectionMiddleware>();
            app.MapRendezvousContractEndpoints();
            await app.StartAsync();
            IServer server = app.Services.GetRequiredService<IServer>();
            string address = Assert.Single(server.Features.Get<IServerAddressesFeature>()!.Addresses);
            return new(
                app,
                new HttpClient { BaseAddress = new Uri(address) },
                store,
                capabilities,
                credential);
        }

        public async ValueTask DisposeAsync()
        {
            HttpClient.Dispose();
            await _application.StopAsync();
            await _application.DisposeAsync();
        }
    }
}