using ClaudeDo.Data;
using ClaudeDo.Data.Models;
using ClaudeDo.Data.Repositories;
using ClaudeDo.Worker.External;
using ClaudeDo.Worker.Git;
using ClaudeDo.Worker.Hub;
using ClaudeDo.Worker.Lifecycle;
using ClaudeDo.Worker.Planning;
using ClaudeDo.Worker.Queue;
using ClaudeDo.Worker.Runner;
using ClaudeDo.Worker.State;
using ClaudeDo.Worker.Tests.Infrastructure;
using ClaudeDo.Worker.Usage;
using ClaudeDo.Worker.Worktrees;
using ClaudeDo.Data.Git;
using ClaudeDo.Worker.Config;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging.Abstractions;
using TaskStatus = ClaudeDo.Data.Models.TaskStatus;

namespace ClaudeDo.Worker.Tests.External;

public sealed class LifecycleMcpToolsTests : 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 static bool GitAvailable => GitRepoFixture.IsGitAvailable();

    public LifecycleMcpToolsTests()
    {
        _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 LifecycleMcpTools BuildSut()
    {
        var cfg = new WorkerConfig
        {
            SandboxRoot = Path.Combine(Path.GetTempPath(), $"cd_{Guid.NewGuid():N}"),
            LogRoot = Path.Combine(Path.GetTempPath(), $"cdl_{Guid.NewGuid():N}"),
        };
        var git = new GitService();
        var dbFactory = _db.CreateFactory();
        var broadcaster = new HubBroadcaster(new CapturingHubContext());
        var wtManager = new WorktreeManager(git, dbFactory, cfg, NullLogger<WorktreeManager>.Instance);
        var state = TaskStateServiceBuilder.Build(dbFactory).State;
        var reset = new TaskResetService(dbFactory, wtManager, broadcaster, state, NullLogger<TaskResetService>.Instance);
        var maintenance = new WorktreeMaintenanceService(dbFactory, git, NullLogger<WorktreeMaintenanceService>.Instance);
        var merge = new TaskMergeService(dbFactory, git, broadcaster, state, new VerifyCommandRunner(), NullLogger<TaskMergeService>.Instance);
        var aggregator = new PlanningAggregator(dbFactory, git, NullLogger<PlanningAggregator>.Instance);
        var planningMerge = new PlanningMergeOrchestrator(
            dbFactory, merge, aggregator, broadcaster, git, state, NullLogger<PlanningMergeOrchestrator>.Instance);
        var svc = new ExternalMcpService(
            _tasks, _lists, CreateQueue(dbFactory, wtManager, state, broadcaster), broadcaster,
            state, git, dbFactory, maintenance, merge, planningMerge,
            new BaseDirtyChecker(git, NullLogger<BaseDirtyChecker>.Instance));
        var reviewSubmission = new InteractiveReviewSubmissionService(dbFactory, git, state, wtManager);
        return new LifecycleMcpTools(_tasks, reset, svc, reviewSubmission);
    }

    private QueueService CreateQueue(
        IDbContextFactory<ClaudeDoDbContext> dbFactory, WorktreeManager wtManager, ITaskStateService state, HubBroadcaster broadcaster)
    {
        var cfg = new WorkerConfig
        {
            SandboxRoot = Path.Combine(Path.GetTempPath(), $"cdq_{Guid.NewGuid():N}"),
            LogRoot = Path.Combine(Path.GetTempPath(), $"cdql_{Guid.NewGuid():N}"),
            QueueBackstopIntervalMs = 50,
        };
        var runner = new TaskRunner(new FakeClaudeProcess(), dbFactory, broadcaster, wtManager, new ClaudeArgsBuilder(), cfg,
            NullLogger<TaskRunner>.Instance, state, new TaskRunTokenRegistry(), new AttachmentStore(), new FakeSessionSkillSeeder(), new FakeTranscriptUsageReader());
        var runCancels = new RunCancellationRegistry(NullLogger<RunCancellationRegistry>.Instance);
        var overrideSlot = new OverrideSlotService(dbFactory, runner, NullLogger<OverrideSlotService>.Instance, runCancels);
        return new QueueService(dbFactory, runner, cfg, NullLogger<QueueService>.Instance,
            new QueueWaker(), new QueuePicker(dbFactory), overrideSlot, state, runCancels,
            new FakeUsageGate(), new UsageState(), broadcaster);
    }

    private async Task<TaskEntity> SeedTaskAsync(
        TaskStatus status, string? workingDir = null, string? handlerBaseCommit = null)
    {
        var listId = Guid.NewGuid().ToString();
        await _lists.AddAsync(new ListEntity { Id = listId, Name = "L", WorkingDir = workingDir, CreatedAt = DateTime.UtcNow });
        var task = new TaskEntity
        {
            Id = Guid.NewGuid().ToString(), ListId = listId, Title = "t",
            Status = status, HandlerBaseCommit = handlerBaseCommit,
            CreatedAt = DateTime.UtcNow, CommitType = "chore",
        };
        await _tasks.AddAsync(task);
        return task;
    }

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

    [Fact]
    public async Task ResetFailedTask_OnFailed_ResetsToIdle()
    {
        var task = await SeedTaskAsync(TaskStatus.Failed);
        var sut = BuildSut();

        var result = await sut.ResetFailedTask(task.Id, CancellationToken.None);

        Assert.True(result.Reset);
        Assert.Equal(task.Id, result.TaskId);
        var loaded = await _tasks.GetByIdAsync(task.Id);
        Assert.Equal(TaskStatus.Idle, loaded!.Status);
    }

    [Fact]
    public async Task ResetFailedTask_OnNonFailed_Throws()
    {
        var task = await SeedTaskAsync(TaskStatus.Done);
        var sut = BuildSut();

        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            sut.ResetFailedTask(task.Id, CancellationToken.None));
    }

    [Fact]
    public async Task ResetFailedTask_NotFound_Throws()
    {
        var sut = BuildSut();
        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            sut.ResetFailedTask("missing", CancellationToken.None));
    }

    // ── SubmitTaskForReview ──

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

        var repo = CreateRepo();
        var task = await SeedTaskAsync(TaskStatus.Idle, workingDir: repo.RepoDir, handlerBaseCommit: repo.BaseCommit);
        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 sut = BuildSut();

        var dto = await sut.SubmitTaskForReview(task.Id, CancellationToken.None);

        Assert.Equal("WaitingForReview", dto.Status);
        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 task = await SeedTaskAsync(TaskStatus.Idle, workingDir: Path.GetTempPath());
        var sut = BuildSut();

        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            sut.SubmitTaskForReview(task.Id, CancellationToken.None));
    }

    [Fact]
    public async Task SubmitTaskForReview_RunningTask_Throws()
    {
        var task = await SeedTaskAsync(TaskStatus.Running, workingDir: Path.GetTempPath(), handlerBaseCommit: "abc123");
        var sut = BuildSut();

        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            sut.SubmitTaskForReview(task.Id, CancellationToken.None));
    }

    [Fact]
    public async Task SubmitTaskForReview_AlreadyDone_Throws_HandlerHeadCommitUntouched()
    {
        var task = await SeedTaskAsync(TaskStatus.Done, workingDir: Path.GetTempPath(), handlerBaseCommit: "abc123");
        var sut = BuildSut();

        var ex = await Assert.ThrowsAsync<InvalidOperationException>(() =>
            sut.SubmitTaskForReview(task.Id, CancellationToken.None));
        Assert.Contains("Idle or Failed", ex.Message);

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

    [Fact]
    public async Task SubmitTaskForReview_NotFound_Throws()
    {
        var sut = BuildSut();
        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            sut.SubmitTaskForReview("missing", CancellationToken.None));
    }
}