using System.Net.Http;
using Microsoft.AspNetCore.SignalR.Client;
using VideoDownloader.Server;

namespace VideoDownloader.Tests.Server;

/// <summary>
/// E2E: SignalR <c>/hubs/queue</c> — MOBILE_PLAN §3 API 설계안의 실시간 큐 푸시.
/// 실제 Kestrel 기동 → 허브 접속(쿼리 토큰 인증) → 스냅샷 조회 + 큐 변경 시 서버 푸시 수신.
/// </summary>
public class QueueHubE2ETests : IDisposable
{
    private readonly string _libDir = Path.Combine(Path.GetTempPath(), $"vd_hub_{Guid.NewGuid():N}");

    public QueueHubE2ETests() => Directory.CreateDirectory(_libDir);

    private sealed class FakeQueue : IQueueAdapter
    {
        public List<QueueItemDto> Items { get; } = new();

        public Task<IReadOnlyList<QueueItemDto>> GetItemsAsync() => Task.FromResult<IReadOnlyList<QueueItemDto>>(Items);
        public Task<string> AddAsync(string url, string? title)
        {
            var item = new QueueItemDto(Guid.NewGuid().ToString("N"), title ?? url, url, "대기", 0);
            Items.Add(item);
            Changed?.Invoke();
            return Task.FromResult(item.Id);
        }
        public Task PauseAsync(string id) => Task.CompletedTask;
        public Task ResumeAsync(string id) => Task.CompletedTask;
        public Task CancelAsync(string id) => Task.CompletedTask;

        public event Action? Changed;
    }

    [Fact]
    public async Task 큐허브_스냅샷_조회와_변경시_푸시_E2E()
    {
        var queue = new FakeQueue();
        await using var server = await ServerHost.StartAsync(new ServerOptions
        {
            Port = 0,
            Token = "hub-token-123",
            LibraryFolder = _libDir,
            Queue = queue,
        });

        await using var conn = new HubConnectionBuilder()
            .WithUrl($"http://127.0.0.1:{server.Port}/hubs/queue?t=hub-token-123")
            .Build();

        var pushed = new TaskCompletionSource<List<QueueItemDto>>(TaskCreationOptions.RunContinuationsAsynchronously);
        conn.On<List<QueueItemDto>>("queueUpdated", items => pushed.TrySetResult(items));

        await conn.StartAsync();

        // 1) 허브 메서드로 현재 스냅샷 조회
        var snapshot = await conn.InvokeAsync<List<QueueItemDto>>("GetQueue");
        Assert.Empty(snapshot);

        // 2) 큐 변경 → 폴링 없이 서버가 밀어줌 (2초 폴링의 실시간 대체)
        await queue.AddAsync("https://x.test/push.mp4", "푸시 영상");
        var items = await pushed.Task.WaitAsync(TimeSpan.FromSeconds(10));
        Assert.Single(items);
        Assert.Equal("푸시 영상", items[0].Title);
    }

    [Fact]
    public async Task 큐허브_잘못된_토큰은_401_거부()
    {
        await using var server = await ServerHost.StartAsync(new ServerOptions
        {
            Port = 0,
            Token = "hub-token-123",
            LibraryFolder = _libDir,
            Queue = new FakeQueue(),
        });

        await using var conn = new HubConnectionBuilder()
            .WithUrl($"http://127.0.0.1:{server.Port}/hubs/queue?t=wrong-token")
            .Build();

        await Assert.ThrowsAsync<HttpRequestException>(() => conn.StartAsync());
    }

    public void Dispose()
    {
        try { Directory.Delete(_libDir, recursive: true); } catch (IOException) { }
    }
}