using ClaudeDo.Data;
using ClaudeDo.Data.Git;
using ClaudeDo.Data.Models;
using ClaudeDo.Data.Repositories;
using ClaudeDo.Worker.Config;
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.Tests.Infrastructure;
using ClaudeDo.Worker.Tests.Services;
using ClaudeDo.Worker.Usage;
using ClaudeDo.Worker.Worktrees;
using Microsoft.Extensions.Logging.Abstractions;
using ModelContextProtocol;
using TaskStatus = ClaudeDo.Data.Models.TaskStatus;

namespace ClaudeDo.Worker.Tests.External;

// A synchronously-collecting IProgress<T>: Progress<T> marshals through the SynchronizationContext
// captured at construction, which is unreliable to assert on immediately in a test.
file sealed class SyncProgress<T> : IProgress<T>
{
    public readonly List<T> Reports = new();
    public void Report(T value) => Reports.Add(value);
}

public sealed class WorktreeMcpToolsTests : IDisposable
{
    private readonly DbFixture _db = new();
    private readonly ClaudeDoDbContext _ctx;
    private readonly TaskRepository _tasks;
    private readonly ListRepository _lists;
    private readonly HubBroadcaster _broadcaster;
    private readonly List<GitRepoFixture> _repos = new();
    private readonly List<(string repoDir, string wtPath)> _worktreeCleanups = new();
    private int _numberSeed;

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

    public WorktreeMcpToolsTests()
    {
        _ctx = _db.CreateContext();
        _tasks = new TaskRepository(_ctx);
        _lists = new ListRepository(_ctx);
        _broadcaster = new HubBroadcaster(new CapturingHubContext());
    }

    public void Dispose()
    {
        foreach (var (repoDir, wtPath) in _worktreeCleanups)
        {
            try { GitRepoFixture.RunGit(repoDir, "worktree", "remove", "--force", wtPath); } catch { }
        }
        foreach (var r in _repos) r.Dispose();
        _ctx.Dispose();
        _db.Dispose();
    }

    private async Task<(TaskEntity task, ListEntity list, WorktreeContext wt)> SeedWorktreeAsync(
        TaskStatus status = TaskStatus.Done)
    {
        var repo = new GitRepoFixture();
        _repos.Add(repo);

        var listId = Guid.NewGuid().ToString();
        var list = new ListEntity { Id = listId, Name = "L", WorkingDir = repo.RepoDir, CreatedAt = DateTime.UtcNow };
        await _lists.AddAsync(list);
        var task = await SeedTaskAsync(listId, status: status);

        var cfg = new WorkerConfig { WorktreeRootStrategy = "sibling" };
        var mgr = new WorktreeManager(new GitService(), _db.CreateFactory(), cfg, NullLogger<WorktreeManager>.Instance);
        var wt = await mgr.CreateAsync(task, list, CancellationToken.None);
        _worktreeCleanups.Add((repo.RepoDir, wt.WorktreePath));
        return (task, list, wt);
    }

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

    private async Task<TaskEntity> SeedTaskAsync(
        string listId, string title = "t", TaskStatus status = TaskStatus.Idle, string? parentId = null)
    {
        var task = new TaskEntity
        {
            Id = Guid.NewGuid().ToString(),
            ListId = listId,
            Title = title,
            Status = status,
            ParentTaskId = parentId,
            CreatedAt = DateTime.UtcNow,
            CommitType = "chore",
            Number = ++_numberSeed,
        };
        await _tasks.AddAsync(task);
        return task;
    }

    // queue is accepted (and ignored) so every extracted test body can keep calling
    // BuildSut(CreateQueue()) unchanged -- WorktreeMcpTools itself has no QueueService dependency.
    private WorktreeMcpTools BuildSut(QueueService queue)
    {
        var git = new GitService();
        var factory = _db.CreateFactory();
        var maintenance = new WorktreeMaintenanceService(factory, git, NullLogger<WorktreeMaintenanceService>.Instance);
        return new WorktreeMcpTools(_tasks, git, factory, maintenance);
    }

    // GetTaskWorktree_AfterMerge_ExposesMergeCommit needs a real merge first -- MergeTask lives on
    // MergeMcpTools now, not here. A fresh instance is fine (TaskMergeService/GitService are
    // git-disk- and DB-backed, no shared in-memory state to worry about for a plain merge).
    private MergeMcpTools BuildMergeSut()
    {
        var git = new GitService();
        var factory = _db.CreateFactory();
        var state = TaskStateServiceBuilder.Build(factory).State;
        var merge = new TaskMergeService(factory, git, _broadcaster, state, new VerifyCommandRunner(), NullLogger<TaskMergeService>.Instance);
        var aggregator = new PlanningAggregator(factory, git, NullLogger<PlanningAggregator>.Instance);
        var planningMerge = new PlanningMergeOrchestrator(
            factory, merge, aggregator, _broadcaster, git, state, NullLogger<PlanningMergeOrchestrator>.Instance);
        return new MergeMcpTools(_tasks, _lists, _broadcaster, git, factory, merge, planningMerge);
    }

    private QueueService CreateQueue()
    {
        var tempDir = Path.Combine(Path.GetTempPath(), $"claudedo_worktree_{Guid.NewGuid():N}");
        Directory.CreateDirectory(tempDir);
        var cfg = new WorkerConfig
        {
            SandboxRoot = Path.Combine(tempDir, "sandbox"),
            LogRoot = Path.Combine(tempDir, "logs"),
            QueueBackstopIntervalMs = 50,
        };
        var fake = new FakeClaudeProcess();
        var hubCtx = new CapturingHubContext();
        var broadcaster = new HubBroadcaster(hubCtx);
        var dbFactory = _db.CreateFactory();
        var wtManager = new WorktreeManager(new GitService(), dbFactory, cfg, NullLogger<WorktreeManager>.Instance);
        var argsBuilder = new ClaudeArgsBuilder();
        var state = TaskStateServiceBuilder.Build(dbFactory).State;
        var runner = new TaskRunner(fake, dbFactory, broadcaster, wtManager, argsBuilder, cfg,
            NullLogger<TaskRunner>.Instance, state, new TaskRunTokenRegistry(), new AttachmentStore(), new FakeSessionSkillSeeder(), new FakeTranscriptUsageReader());
        var waker = new ClaudeDo.Worker.Queue.QueueWaker();
        var picker = new ClaudeDo.Worker.Queue.QueuePicker(dbFactory);
        var runCancels = new RunCancellationRegistry(NullLogger<RunCancellationRegistry>.Instance);
        var overrideSlot = new OverrideSlotService(dbFactory, runner, NullLogger<OverrideSlotService>.Instance, runCancels);
        var usageState = new UsageState();
        return new QueueService(dbFactory, runner, cfg, NullLogger<QueueService>.Instance, waker, picker, overrideSlot, state, runCancels,
            new FakeUsageGate(), usageState, broadcaster,
            new UsageLimitAutoContinueCoordinator(dbFactory, usageState, overrideSlot, broadcaster, NullLogger<UsageLimitAutoContinueCoordinator>.Instance));
    }

    [Fact]
    public async Task GetTaskWorktree_NoWorktree_Throws()
    {
        var listId = await SeedListAsync();
        var task = await SeedTaskAsync(listId);
        var sut = BuildSut(CreateQueue());

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

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

        var (task, _, wt) = await SeedWorktreeAsync();
        var sut = BuildSut(CreateQueue());

        var info = await sut.GetTaskWorktree(task.Id, CancellationToken.None);

        Assert.Equal(wt.BranchName, info.Branch);
        Assert.Equal(wt.BaseCommit, info.BaseCommit);
        Assert.Equal(0, info.Ahead);
        Assert.False(info.IsDirty);
    }

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

        var (task, _, _) = await SeedWorktreeAsync();
        var sut = BuildSut(CreateQueue());

        var info = await sut.GetTaskWorktree(task.Id, CancellationToken.None);

        Assert.Null(info.MergeCommit);
    }

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

        var (task, list, wt) = await SeedWorktreeAsync(TaskStatus.Done);
        File.WriteAllText(Path.Combine(wt.WorktreePath, "added.txt"), "new\n");
        GitRepoFixture.RunGit(wt.WorktreePath, "add", "-A");
        GitRepoFixture.RunGit(wt.WorktreePath, "commit", "-m", "feat: add file");

        var target = await new GitService().GetCurrentBranchAsync(list.WorkingDir!, CancellationToken.None);
        var mergeSut = BuildMergeSut();
        await mergeSut.MergeTask(task.Id, target, true, false, false, cancellationToken: CancellationToken.None);

        var sut = BuildSut(CreateQueue());
        var info = await sut.GetTaskWorktree(task.Id, CancellationToken.None);

        var expected = GitRepoFixture.RunGit(list.WorkingDir!, "rev-parse", "HEAD").Trim();
        Assert.Equal(expected, info.MergeCommit);
    }

    [Fact]
    public async Task GetTaskDiff_NoWorktree_Throws()
    {
        var listId = await SeedListAsync();
        var task = await SeedTaskAsync(listId);
        var sut = BuildSut(CreateQueue());

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

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

        var (task, list, wt) = await SeedWorktreeAsync();
        File.WriteAllText(Path.Combine(wt.WorktreePath, "added.txt"), "content");

        var cfg = new WorkerConfig { WorktreeRootStrategy = "sibling" };
        var mgr = new WorktreeManager(new GitService(), _db.CreateFactory(), cfg, NullLogger<WorktreeManager>.Instance);
        await mgr.CommitIfChangedAsync(wt, task, list, CancellationToken.None);

        var sut = BuildSut(CreateQueue());
        var diff = await sut.GetTaskDiff(task.Id, false, null, CancellationToken.None);

        Assert.Contains("added.txt", diff.Files);
        Assert.False(diff.Truncated);
    }

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

        var (task, list, wt) = await SeedWorktreeAsync();
        File.WriteAllText(Path.Combine(wt.WorktreePath, "added.txt"), "content");
        File.WriteAllText(Path.Combine(wt.WorktreePath, "other.txt"), "other content");

        var cfg = new WorkerConfig { WorktreeRootStrategy = "sibling" };
        var mgr = new WorktreeManager(new GitService(), _db.CreateFactory(), cfg, NullLogger<WorktreeManager>.Instance);
        await mgr.CommitIfChangedAsync(wt, task, list, CancellationToken.None);

        var sut = BuildSut(CreateQueue());
        var diff = await sut.GetTaskDiff(task.Id, false, ["added.txt"], CancellationToken.None);

        Assert.Equal(new[] { "added.txt" }, diff.Files);
        Assert.DoesNotContain("other.txt", diff.Content);
    }

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

        var (task, list, wt) = await SeedWorktreeAsync();
        File.WriteAllText(Path.Combine(wt.WorktreePath, "added.txt"), "content");
        File.WriteAllText(Path.Combine(wt.WorktreePath, "other.txt"), "other content");

        var cfg = new WorkerConfig { WorktreeRootStrategy = "sibling" };
        var mgr = new WorktreeManager(new GitService(), _db.CreateFactory(), cfg, NullLogger<WorktreeManager>.Instance);
        await mgr.CommitIfChangedAsync(wt, task, list, CancellationToken.None);

        var sut = BuildSut(CreateQueue());
        var diff = await sut.GetTaskDiff(task.Id, true, ["other.txt"], CancellationToken.None);

        Assert.Equal(new[] { "other.txt" }, diff.Files);
        Assert.DoesNotContain("added.txt", diff.Content);
    }

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

        var repo = new GitRepoFixture();
        _repos.Add(repo);
        var listId = Guid.NewGuid().ToString();
        await _lists.AddAsync(new ListEntity { Id = listId, Name = "L", WorkingDir = repo.RepoDir, CreatedAt = DateTime.UtcNow });
        var task = await SeedTaskAsync(listId, status: TaskStatus.WaitingForReview);
        // No WorktreeEntity for this task -- it's a worktree-less list-handler host task
        // (Mission Control's "Let Claude handle it"): the handler merged its own commit
        // straight into the list's working dir after HandlerBaseCommit was stamped.

        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 headCommit = GitRepoFixture.RunGit(repo.RepoDir, "rev-parse", "HEAD").Trim();

        using (var ctx = _db.CreateContext())
        {
            var t = await ctx.Tasks.FindAsync(task.Id);
            t!.HandlerBaseCommit = repo.BaseCommit;
            t.HandlerHeadCommit = headCommit;
            await ctx.SaveChangesAsync();
        }

        var sut = BuildSut(CreateQueue());
        var diff = await sut.GetTaskDiff(task.Id, false, null, CancellationToken.None);

        Assert.Contains("handled.txt", diff.Files);
        Assert.False(diff.Truncated);
    }

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

        var repo = new GitRepoFixture();
        _repos.Add(repo);
        var listId = Guid.NewGuid().ToString();
        await _lists.AddAsync(new ListEntity { Id = listId, Name = "L", WorkingDir = repo.RepoDir, CreatedAt = DateTime.UtcNow });
        var task = await SeedTaskAsync(listId, status: TaskStatus.WaitingForReview);

        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 headCommit = GitRepoFixture.RunGit(repo.RepoDir, "rev-parse", "HEAD").Trim();

        using (var ctx = _db.CreateContext())
        {
            var t = await ctx.Tasks.FindAsync(task.Id);
            t!.HandlerBaseCommit = repo.BaseCommit;
            t.HandlerHeadCommit = headCommit;
            await ctx.SaveChangesAsync();
        }

        var sut = BuildSut(CreateQueue());
        var diff = await sut.GetTaskDiff(task.Id, true, null, CancellationToken.None);

        Assert.Contains("handled.txt", diff.Content);
    }

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

        var original = WorktreeMcpTools.ProgressReportInterval;
        WorktreeMcpTools.ProgressReportInterval = TimeSpan.Zero;
        try
        {
            var (task, list, wt) = await SeedWorktreeAsync();
            File.WriteAllText(Path.Combine(wt.WorktreePath, "added.txt"), "content");
            var cfg = new WorkerConfig { WorktreeRootStrategy = "sibling" };
            var mgr = new WorktreeManager(new GitService(), _db.CreateFactory(), cfg, NullLogger<WorktreeManager>.Instance);
            await mgr.CommitIfChangedAsync(wt, task, list, CancellationToken.None);

            var sut = BuildSut(CreateQueue());
            var progress = new SyncProgress<ProgressNotificationValue>();

            var diff = await sut.GetTaskDiff(task.Id, false, null, CancellationToken.None, progress);

            Assert.Contains("added.txt", diff.Files);
            Assert.NotEmpty(progress.Reports);
            Assert.All(progress.Reports, r => Assert.Contains("computing diff", r.Message));
        }
        finally
        {
            WorktreeMcpTools.ProgressReportInterval = original;
        }
    }

    [Fact]
    public async Task ListWorktrees_Empty_ReturnsEmpty()
    {
        var sut = BuildSut(CreateQueue());

        var rows = await sut.ListWorktrees(CancellationToken.None);

        Assert.Empty(rows);
    }

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

        var (task, _, _) = await SeedWorktreeAsync();
        var sut = BuildSut(CreateQueue());

        var rows = await sut.ListWorktrees(CancellationToken.None);

        Assert.Contains(rows, r => r.TaskId == task.Id);
    }

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

        var original = WorktreeMcpTools.ProgressReportInterval;
        WorktreeMcpTools.ProgressReportInterval = TimeSpan.Zero;
        try
        {
            await SeedWorktreeAsync();
            var sut = BuildSut(CreateQueue());
            var progress = new SyncProgress<ProgressNotificationValue>();

            var rows = await sut.ListWorktrees(CancellationToken.None, progress);

            Assert.NotEmpty(rows);
            Assert.NotEmpty(progress.Reports);
        }
        finally
        {
            WorktreeMcpTools.ProgressReportInterval = original;
        }
    }

    [Fact]
    public async Task CleanupTaskWorktree_NotFound_Throws()
    {
        var sut = BuildSut(CreateQueue());

        await Assert.ThrowsAsync<InvalidOperationException>(
            () => sut.CleanupTaskWorktree("does-not-exist", false, CancellationToken.None));
    }

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

        var (task, _, _) = await SeedWorktreeAsync(TaskStatus.Running);
        var sut = BuildSut(CreateQueue());

        var ex = await Assert.ThrowsAsync<InvalidOperationException>(
            () => sut.CleanupTaskWorktree(task.Id, false, CancellationToken.None));
        Assert.Contains("running", ex.Message, StringComparison.OrdinalIgnoreCase);
    }

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

        var (task, _, wt) = await SeedWorktreeAsync(TaskStatus.Done);
        var sut = BuildSut(CreateQueue());

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

        Assert.True(result.Removed);
        Assert.False(Directory.Exists(wt.WorktreePath));
    }

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

        var original = WorktreeMcpTools.ProgressReportInterval;
        WorktreeMcpTools.ProgressReportInterval = TimeSpan.Zero;
        try
        {
            var (task, _, wt) = await SeedWorktreeAsync(TaskStatus.Done);
            var sut = BuildSut(CreateQueue());
            var progress = new SyncProgress<ProgressNotificationValue>();

            var result = await sut.CleanupTaskWorktree(task.Id, false, CancellationToken.None, progress);

            Assert.True(result.Removed);
            Assert.False(Directory.Exists(wt.WorktreePath));
            Assert.NotEmpty(progress.Reports);
        }
        finally
        {
            WorktreeMcpTools.ProgressReportInterval = original;
        }
    }
}