using ClaudeDo.Data;
using ClaudeDo.Data.Git;
using ClaudeDo.Data.Models;
using ClaudeDo.Data.Repositories;
using ClaudeDo.Worker.Config;
using ClaudeDo.Worker.Hub;
using ClaudeDo.Worker.Runner;
using ClaudeDo.Worker.Skills;
using ClaudeDo.Worker.Tests.Infrastructure;
using Microsoft.AspNetCore.SignalR;
using Microsoft.Extensions.Logging.Abstractions;
using Xunit;
using TaskStatus = ClaudeDo.Data.Models.TaskStatus;

namespace ClaudeDo.Worker.Tests.Hub;

/// Covers the two hub methods a worktree-less "list handler" host task (Mission Control's
/// "Let Claude handle it") relies on: CreateMergeHelperTask (task creation + HandlerBaseCommit
/// stamp) and SubmitTaskForReview's worktree-less branch (HandlerHeadCommit stamp + transition).
/// The handler itself merges the tasks it handles directly into the list's working dir -- no
/// worktree of its own -- so these hub methods are the whole story for its review range.
public sealed class MergeHelperTaskHubTests : IDisposable
{
    private readonly DbFixture _db = new();
    private readonly ClaudeDoDbContext _ctx;
    private readonly TaskRepository _tasks;
    private readonly ListRepository _lists;
    private readonly List<GitRepoFixture> _repos = new();
    private readonly RecordingClientProxy _proxy = new();

    private static bool GitAvailable => GitRepoFixture.IsGitAvailable();

    public MergeHelperTaskHubTests()
    {
        _ctx = _db.CreateContext();
        _tasks = new TaskRepository(_ctx);
        _lists = new ListRepository(_ctx);
    }

    public void Dispose()
    {
        foreach (var r in _repos) r.Dispose();
        _ctx.Dispose();
        _db.Dispose();
    }

    private sealed class FakeSessionSkillRegistry : ISessionSkillRegistry
    {
        public Task<IReadOnlyList<string>> InstallAsync(string url, CancellationToken ct) => throw new NotImplementedException();
        public Task UpdateAsync(string sourceUrl, CancellationToken ct) => throw new NotImplementedException();
        public Task RemoveAsync(string sourceUrl, CancellationToken ct) => throw new NotImplementedException();
        public Task<IReadOnlyList<SessionSkillEntity>> ListAsync(CancellationToken ct)
            => Task.FromResult<IReadOnlyList<SessionSkillEntity>>(Array.Empty<SessionSkillEntity>());
    }

    private WorkerHub CreateHub()
    {
        var factory = _db.CreateFactory();
        var git = new GitService();
        var wtManager = new WorktreeManager(git, factory, new WorkerConfig(), NullLogger<WorktreeManager>.Instance);
        var interactiveLaunchSpec = new InteractiveLaunchSpecService(
            factory, new FakeSessionSkillSeeder(), new FakeSessionSkillRegistry(), wtManager, git,
            new WorkerConfig { ClaudeBin = "claude" });
        var built = TaskStateServiceBuilder.Build(factory);

        var hub = new WorkerHub(
            null!, null!, null!, null!, null!, factory, null!, null!, null!,
            null!, null!, null!, null!, null!, null!, null!, built.State, null!, null!,
            null!, new ClaudeDo.Worker.Online.OnlineInboxConfig(), new ClaudeDo.Worker.Online.OnlineTokenStore(),
            new ClaudeDo.Worker.Runner.PendingQuestionRegistry(), null!,
            logBuffer: null, interactiveLaunchSpec: interactiveLaunchSpec, worktreeManager: wtManager, git: git);
        hub.Clients = new FakeHubCallerClients(_proxy);
        hub.Context = new FakeHubCallerContext();
        return hub;
    }

    private GitRepoFixture CreateRepo()
    {
        var f = new GitRepoFixture();
        _repos.Add(f);
        return f;
    }

    private async Task<string> SeedListAsync(string workingDir, string name = "L")
    {
        var listId = Guid.NewGuid().ToString();
        await _lists.AddAsync(new ListEntity { Id = listId, Name = name, WorkingDir = workingDir, CreatedAt = DateTime.UtcNow });
        return listId;
    }

    private async Task<TaskEntity> SeedTaskAsync(
        string listId, TaskStatus status = TaskStatus.Idle, string? handlerBaseCommit = null, string title = "T")
    {
        var task = new TaskEntity
        {
            Id = Guid.NewGuid().ToString(),
            ListId = listId,
            Title = title,
            Status = status,
            HandlerBaseCommit = handlerBaseCommit,
            CreatedAt = DateTime.UtcNow,
        };
        await _tasks.AddAsync(task);
        return task;
    }

    // ── CreateMergeHelperTask ──

    [Fact]
    public async Task CreateMergeHelperTask_CreatesIdleManualTask_StampsBaseCommit_Broadcasts()
    {
        if (!GitAvailable) { Assert.True(true, "git not available -- skipping"); return; }

        var repo = CreateRepo();
        var listId = await SeedListAsync(repo.RepoDir, name: "Alpha");
        var t1 = await SeedTaskAsync(listId, TaskStatus.WaitingForReview, title: "First task");

        var hub = CreateHub();
        var newTaskId = await hub.CreateMergeHelperTask(
            new[] { t1.Id }, listId, "List handler: Alpha", "Tasks handled by this run:");

        var created = await _tasks.GetByIdAsync(newTaskId);
        Assert.NotNull(created);
        Assert.Equal(TaskStatus.Idle, created!.Status);
        Assert.True(created.IsManual);
        Assert.Equal(repo.BaseCommit, created.HandlerBaseCommit);
        Assert.Contains("First task", created.Description);
        Assert.Contains(_proxy.Sent, m => m.method == "TaskUpdated");
    }

    [Fact]
    public async Task CreateMergeHelperTask_UnknownList_Throws()
    {
        var hub = CreateHub();
        await Assert.ThrowsAsync<HubException>(
            () => hub.CreateMergeHelperTask(new[] { "t1" }, "no-such-list", "title", "header"));
    }

    // ── SubmitTaskForReview (worktree-less branch) ──

    [Fact]
    public async Task SubmitTaskForReview_WorktreeLessHandlerTask_StampsHeadCommit_TransitionsToWaitingForReview()
    {
        if (!GitAvailable) { Assert.True(true, "git not available -- skipping"); return; }

        var repo = CreateRepo();
        var listId = await SeedListAsync(repo.RepoDir);
        var task = await SeedTaskAsync(listId, TaskStatus.Idle, handlerBaseCommit: repo.BaseCommit);

        // The handler merged a task's worktree into the list's working dir on its own.
        File.WriteAllText(Path.Combine(repo.RepoDir, "handled.txt"), "content");
        GitRepoFixture.RunGit(repo.RepoDir, "add", "-A");
        GitRepoFixture.RunGit(repo.RepoDir, "commit", "-m", "handled task merge");
        var expectedHead = GitRepoFixture.RunGit(repo.RepoDir, "rev-parse", "HEAD").Trim();

        var hub = CreateHub();
        await hub.SubmitTaskForReview(task.Id);

        var reloaded = await _tasks.GetByIdAsync(task.Id);
        Assert.Equal(TaskStatus.WaitingForReview, reloaded!.Status);
        Assert.Equal(expectedHead, reloaded.HandlerHeadCommit);
    }

    [Fact]
    public async Task SubmitTaskForReview_NoWorktreeAndNoHandlerBaseCommit_Throws()
    {
        var listId = await SeedListAsync(Path.GetTempPath());
        var task = await SeedTaskAsync(listId, TaskStatus.Idle);

        var hub = CreateHub();
        await Assert.ThrowsAsync<HubException>(() => hub.SubmitTaskForReview(task.Id));
    }

    [Fact]
    public async Task SubmitTaskForReview_RunningTask_Throws_RegardlessOfHandlerState()
    {
        var listId = await SeedListAsync(Path.GetTempPath());
        var task = await SeedTaskAsync(listId, TaskStatus.Running, handlerBaseCommit: "abc123");

        var hub = CreateHub();
        await Assert.ThrowsAsync<HubException>(() => hub.SubmitTaskForReview(task.Id));
    }
}

// RecordingClientProxy / FakeHubCallerClients / FakeHubCallerContext are defined once for the
// whole ClaudeDo.Worker.Tests.Hub namespace in PlanningHubTests.cs; reused here as-is.