using System.Net;
using System.Net.Http.Headers;
using System.Net.Http.Json;
using System.Text;
using System.Text.Json;
using FinalFactory.Rendezvous.Contracts;
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.Sessions;

public sealed class SessionHttpEndpointTests
{
    [Fact]
    public async Task AuthenticatedHttpLifecycleReturnsStableContractsAndStatuses()
    {
        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 publisherCredential = 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.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>();
        await using WebApplication app = builder.Build();
        app.UseExceptionHandler();
        app.MapRendezvousContractEndpoints();
        await app.StartAsync();
        IServer server = app.Services.GetRequiredService<IServer>();
        string address = Assert.Single(server.Features.Get<IServerAddressesFeature>()!.Addresses);
        using HttpClient client = new() { BaseAddress = new Uri(address) };
        RegisterSessionRequest registration = new()
        {
            IdempotencyKey = "http-register-1",
            GameId = new("space-game"),
            EnvironmentId = new("production"),
            RegionId = new("eu-central"),
            ProtocolVersion = 7,
            BuildVersion = "1.4.2",
            DisplayName = "HTTP host",
            Visibility = ListingVisibility.Public,
            Capacity = new() { CurrentPlayers = 1, MaximumPlayers = 8 },
            Metadata = new Dictionary<string, string>(StringComparer.Ordinal)
            {
                ["mode"] = "co-op",
            },
        };

        HttpResponseMessage unauthenticated = await client.PostAsJsonAsync(
            "/v1/sessions",
            registration,
            ContractJson.Options);
        Assert.Equal(HttpStatusCode.Unauthorized, unauthenticated.StatusCode);
        Assert.Equal("Bearer", Assert.Single(unauthenticated.Headers.WwwAuthenticate).Scheme);
        ApiError? authenticationError = await unauthenticated.Content.ReadFromJsonAsync<ApiError>(
            ContractJson.Options);
        Assert.Equal(RendezvousErrorCode.AuthenticationRequired, authenticationError!.Code);

        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(
            "Bearer",
            publisherCredential);
        string invalidJson = JsonSerializer.Serialize(registration, ContractJson.Options)
            .Replace("\"public\"", "\"futureVisibility\"", StringComparison.Ordinal);
        HttpResponseMessage invalid = await client.PostAsync(
            "/v1/sessions",
            new StringContent(invalidJson, Encoding.UTF8, "application/json"));
        Assert.Equal(HttpStatusCode.BadRequest, invalid.StatusCode);
        ApiError? invalidError = await invalid.Content.ReadFromJsonAsync<ApiError>(ContractJson.Options);
        Assert.Equal(RendezvousErrorCode.InvalidRequest, invalidError!.Code);

        HttpResponseMessage created = await client.PostAsJsonAsync(
            "/v1/sessions",
            registration,
            ContractJson.Options);
        Assert.Equal(HttpStatusCode.Created, created.StatusCode);
        RegisterSessionResponse? session = await created.Content.ReadFromJsonAsync<RegisterSessionResponse>(
            ContractJson.Options);
        Assert.NotNull(session);
        Assert.Equal($"/v1/sessions/{session.ListingId}", created.Headers.Location!.OriginalString);
        Assert.True(capabilities.TryFingerprint(
            session.HostPresenceCapability,
            out SecretFingerprint presenceFingerprint));
        store.BindHostPresence(new(
            session.HostPresenceHandle,
            presenceFingerprint,
            new(AddressFamilyKind.Ipv4, "203.0.113.80", 41_000),
            null));

        BrowseSessionsResponse? browser = await client.GetFromJsonAsync<BrowseSessionsResponse>(
            "/v1/sessions?contractVersion=1&gameId=space-game&environmentId=production&protocolVersion=7&regionId=eu-central&pageSize=10&excludeFull=true",
            ContractJson.Options);
        Assert.Equal(session.ListingId, Assert.Single(browser!.Items).ListingId);
        GetSessionResponse? direct = await client.GetFromJsonAsync<GetSessionResponse>(
            $"/v1/sessions/{session.ListingId}?contractVersion=1&gameId=space-game&environmentId=production&protocolVersion=7",
            ContractJson.Options);
        Assert.Equal(session.ListingId, direct!.Session.ListingId);

        HttpResponseMessage renewed = await client.PostAsJsonAsync(
            $"/v1/sessions/{session.ListingId}/renew",
            new RenewLeaseRequest { LeaseToken = session.LeaseToken },
            ContractJson.Options);
        Assert.Equal(HttpStatusCode.OK, renewed.StatusCode);
        Assert.NotNull(await renewed.Content.ReadFromJsonAsync<RenewLeaseResponse>(ContractJson.Options));

        HttpResponseMessage updated = await client.PutAsJsonAsync(
            $"/v1/sessions/{session.ListingId}",
            new UpdateSessionRequest
            {
                LeaseToken = session.LeaseToken,
                BuildVersion = "1.4.3",
                DisplayName = "HTTP host updated",
                Capacity = new() { CurrentPlayers = 2, MaximumPlayers = 8 },
                Metadata = new Dictionary<string, string> { ["mode"] = "co-op" },
            },
            ContractJson.Options);
        Assert.Equal(HttpStatusCode.NoContent, updated.StatusCode);

        using HttpRequestMessage deleteRequest = new(
            HttpMethod.Delete,
            $"/v1/sessions/{session.ListingId}")
        {
            Content = JsonContent.Create(
                new DeleteSessionRequest { LeaseToken = session.LeaseToken },
                options: ContractJson.Options),
        };
        HttpResponseMessage deleted = await client.SendAsync(deleteRequest);
        Assert.Equal(HttpStatusCode.NoContent, deleted.StatusCode);
        Assert.Equal(StoreResultCode.NotFound, store.GetListing(session.ListingId, false).Code);

        await app.StopAsync();
    }
}