using System.Net;
using System.Net.Sockets;
using System.Text.Json;
using NucleicApp.Services;
using NucleicProtocol.Interop;

namespace NucleicApp.Tests;

public sealed class RendererCoreTests
{
    [Fact]
    public void StoreProjectsSessionsApprovalsAndSettingsFromHostMessagesOnly()
    {
        using var store = new RendererStore();
        store.Apply(TestRepository.Fixture("host", "sessionList"));
        store.Apply(TestRepository.Fixture("host", "approvalRequested"));
        store.Apply(TestRepository.Fixture("host", "dashboard"));
        store.Apply(TestRepository.Fixture("host", "settings"));

        var session = Assert.Single(store.Sessions);
        Assert.Equal("session-1", session.Id);
        Assert.Equal("awaitingApproval", session.Status);
        Assert.Equal(1, session.PendingApprovalCount);
        Assert.Equal("approval-1", Assert.Single(store.PendingApprovals).Id);
        Assert.NotNull(store.Dashboard);
        Assert.True(store.Settings!.Value.GetProperty("resolveApprovalsViaCloud").GetBoolean());

        store.Apply(TestRepository.Fixture("host", "approvalResolved"));
        Assert.Empty(store.PendingApprovals);
    }

    [Fact]
    public async Task HostConnectionReadsRendezvousAndRequestsInitialStateOnReady()
    {
        var directory = Directory.CreateTempSubdirectory("nucleic-renderer-");
        try
        {
            var rendezvousPath = Path.Combine(directory.FullName, "hostd.json");
            await File.WriteAllTextAsync(rendezvousPath, JsonSerializer.Serialize(
                ProtocolInteropTests.ValidRendezvous()));
            using var store = new RendererStore();
            var client = new FakeProtocolClient();
            var factory = new FakeProtocolClientFactory(client);
            await using var connection = new HostConnection(
                store, Path.Combine(directory.FullName, "identity"), factory,
                InlineRendererDispatcher.Instance);

            await connection.StartLocalAsync(rendezvousPath);
            Assert.Equal("host-1", client.Rendezvous?.HostId);
            client.EmitState("{\"state\":\"ready\",\"hostID\":\"host-1\",\"welcome\":{}}");
            Assert.Equal(HostConnectionState.Connected, connection.State);

            var tags = client.Intents.Select(json => ProtocolMessage.Parse(json).Tag).ToArray();
            Assert.Equal(["listSessions", "listDashboard", "listPeers"], tags);

            client.EmitMessage(TestRepository.Fixture("host", "sessionUpdated"));
            Assert.Equal("session-1", Assert.Single(store.Sessions).Id);
        }
        finally { directory.Delete(recursive: true); }
    }

    [Fact]
    public async Task HostConnectionKeepsRetryingAfterSynchronousAdmissionFailures()
    {
        var directory = Directory.CreateTempSubdirectory("nucleic-reconnect-");
        try
        {
            var rendezvousPath = Path.Combine(directory.FullName, "hostd.json");
            await File.WriteAllTextAsync(rendezvousPath, JsonSerializer.Serialize(
                ProtocolInteropTests.ValidRendezvous()));
            using var store = new RendererStore();
            var client = new FakeProtocolClient();
            client.ConnectLocalResults.Enqueue(ProtocolResult.InvalidState);
            client.ConnectLocalResults.Enqueue(ProtocolResult.InvalidState);
            client.ConnectLocalResults.Enqueue(ProtocolResult.Ok);
            await using var connection = new HostConnection(
                store, Path.Combine(directory.FullName, "identity"),
                new FakeProtocolClientFactory(client), InlineRendererDispatcher.Instance);

            await connection.StartLocalAsync(rendezvousPath);
            await WaitUntilAsync(() => client.ConnectLocalCount == 3, TimeSpan.FromSeconds(3));

            Assert.Equal(3, client.ConnectLocalCount);
            Assert.Equal(HostConnectionState.Reconnecting, connection.State);
        }
        finally { directory.Delete(recursive: true); }
    }

    [Fact]
    public async Task LauncherAcceptsOnlyALiveLoopbackRendezvous()
    {
        var directory = Directory.CreateTempSubdirectory("nucleic-launcher-");
        var listener = new TcpListener(IPAddress.Loopback, 0);
        listener.Start();
        try
        {
            var record = ProtocolInteropTests.ValidRendezvous() with
            {
                Port = ((IPEndPoint)listener.LocalEndpoint).Port,
            };
            var path = Path.Combine(directory.FullName, "hostd.json");
            await File.WriteAllTextAsync(path, JsonSerializer.Serialize(record));
            var launcher = new HostdLauncher(new HostdLaunchOptions(
                Path.Combine(directory.FullName, "must-not-launch.exe"), path));
            var result = await launcher.EnsureRunningAsync();
            Assert.Equal(record.Port, result.Port);
        }
        finally
        {
            listener.Stop();
            directory.Delete(recursive: true);
        }
    }

    private static async Task WaitUntilAsync(Func<bool> condition, TimeSpan timeout)
    {
        using var deadline = new CancellationTokenSource(timeout);
        while (!condition()) await Task.Delay(10, deadline.Token);
    }
}