using ClaudeDo.Data;
using ClaudeDo.Data.Models;
using ClaudeDo.Localization;
using ClaudeDo.Ui.Localization;
using ClaudeDo.Ui.Services;
using ClaudeDo.Ui.ViewModels.Islands;
using Microsoft.EntityFrameworkCore;
using TaskStatus = ClaudeDo.Data.Models.TaskStatus;

namespace ClaudeDo.Ui.Tests.ViewModels;

// UX-Audit #1: SetStatusOnRow/CancelRunningTask/RejectReviewToQueue/RejectReviewToIdle used
// to swallow worker failures with a bare `catch { }` — nothing surfaced in the footer strip.
// These now raise ErrorReported.
public class TasksIslandErrorFeedbackTests : IDisposable
{
    private readonly string _dbPath;

    public TasksIslandErrorFeedbackTests()
    {
        _dbPath = Path.Combine(Path.GetTempPath(), $"claudedo_tasksisland_error_feedback_test_{Guid.NewGuid():N}.db");
        using var ctx = NewContext();
        ctx.Database.EnsureCreated();

        var dir = AppContext.BaseDirectory;
        while (dir is not null && !Directory.Exists(Path.Combine(dir, "src", "ClaudeDo.Localization", "locales")))
            dir = Path.GetDirectoryName(dir);
        Loc.Current = new Localizer(
            LocaleStore.Load(Path.Combine(dir!, "src", "ClaudeDo.Localization", "locales")), "en");
    }

    public void Dispose()
    {
        try { File.Delete(_dbPath); } catch { }
        try { File.Delete(_dbPath + "-wal"); } catch { }
        try { File.Delete(_dbPath + "-shm"); } catch { }
    }

    private ClaudeDoDbContext NewContext()
    {
        var opts = new DbContextOptionsBuilder<ClaudeDoDbContext>()
            .UseSqlite($"Data Source={_dbPath}")
            .Options;
        return new ClaudeDoDbContext(opts);
    }


    private sealed class ThrowingWorkerClient : StubWorkerClient
    {
        public Exception? ThrowOnSetTaskStatus;
        public Exception? ThrowOnCancelTask;
        public Exception? ThrowOnRejectToQueue;
        public Exception? ThrowOnRejectToIdle;
        public Exception? ThrowOnSetTaskDone;
        public Exception? ThrowOnUnsetTaskDone;
        public Exception? ThrowOnDequeueTask;
        public readonly List<string> DequeuedTaskIds = new();

        public override Task<BaseDirtyWarningDto?> SetTaskStatusAsync(string taskId, TaskStatus status)
        {
            if (ThrowOnSetTaskStatus is not null) throw ThrowOnSetTaskStatus;
            return Task.FromResult<BaseDirtyWarningDto?>(null);
        }

        public override Task CancelTaskAsync(string taskId)
        {
            if (ThrowOnCancelTask is not null) throw ThrowOnCancelTask;
            return Task.CompletedTask;
        }

        public override Task RejectReviewToQueueAsync(string taskId, string feedback)
        {
            if (ThrowOnRejectToQueue is not null) throw ThrowOnRejectToQueue;
            return Task.CompletedTask;
        }

        public override Task RejectReviewToIdleAsync(string taskId)
        {
            if (ThrowOnRejectToIdle is not null) throw ThrowOnRejectToIdle;
            return Task.CompletedTask;
        }

        public override Task SetTaskDoneAsync(string taskId)
        {
            if (ThrowOnSetTaskDone is not null) throw ThrowOnSetTaskDone;
            return Task.CompletedTask;
        }

        public override Task UnsetTaskDoneAsync(string taskId)
        {
            if (ThrowOnUnsetTaskDone is not null) throw ThrowOnUnsetTaskDone;
            return Task.CompletedTask;
        }

        public override Task DequeueTaskAsync(string taskId)
        {
            DequeuedTaskIds.Add(taskId);
            if (ThrowOnDequeueTask is not null) throw ThrowOnDequeueTask;
            return Task.CompletedTask;
        }
    }

    [Fact]
    public async Task SetStatusOnRow_WhenWorkerThrows_RaisesErrorReported()
    {
        var worker = new ThrowingWorkerClient { ThrowOnSetTaskStatus = new Exception("status update offline") };
        var vm = new TasksIslandViewModel(new TestDbFactory(NewContext), worker);

        string? reportedError = null;
        vm.ErrorReported += msg => reportedError = msg;

        var row = new TaskRowViewModel { Id = "task-status-1", Status = TaskStatus.Idle };
        await vm.SetStatusOnRowAsync(row, TaskStatus.Queued);

        Assert.NotNull(reportedError);
        Assert.Contains("status update offline", reportedError);
    }

    [Fact]
    public async Task CancelRunningTask_WhenWorkerThrows_RaisesErrorReported()
    {
        var worker = new ThrowingWorkerClient { ThrowOnCancelTask = new Exception("cancel offline") };
        var vm = new TasksIslandViewModel(new TestDbFactory(NewContext), worker);

        string? reportedError = null;
        vm.ErrorReported += msg => reportedError = msg;

        var row = new TaskRowViewModel { Id = "task-cancel-1", Status = TaskStatus.Running };
        await vm.CancelRunningTaskCommand.ExecuteAsync(row);

        Assert.NotNull(reportedError);
        Assert.Contains("cancel offline", reportedError);
    }

    [Fact]
    public async Task RejectReviewToQueue_WhenWorkerThrows_RaisesErrorReported()
    {
        var worker = new ThrowingWorkerClient { ThrowOnRejectToQueue = new Exception("reject-to-queue offline") };
        var vm = new TasksIslandViewModel(new TestDbFactory(NewContext), worker);

        string? reportedError = null;
        vm.ErrorReported += msg => reportedError = msg;

        var row = new TaskRowViewModel { Id = "task-reject-queue-1", Status = TaskStatus.WaitingForReview };
        await vm.RejectReviewToQueueAsync(row, "needs another pass");

        Assert.NotNull(reportedError);
        Assert.Contains("reject-to-queue offline", reportedError);
    }

    [Fact]
    public async Task RejectReviewToIdle_WhenWorkerThrows_RaisesErrorReported()
    {
        var worker = new ThrowingWorkerClient { ThrowOnRejectToIdle = new Exception("reject-to-idle offline") };
        var vm = new TasksIslandViewModel(new TestDbFactory(NewContext), worker);

        string? reportedError = null;
        vm.ErrorReported += msg => reportedError = msg;

        var row = new TaskRowViewModel { Id = "task-reject-idle-1", Status = TaskStatus.WaitingForReview };
        await vm.RejectReviewToIdleCommand.ExecuteAsync(row);

        Assert.NotNull(reportedError);
        Assert.Contains("reject-to-idle offline", reportedError);
    }

    [Fact]
    public async Task ToggleDone_MarkDone_WhenWorkerThrows_RaisesErrorReported_AndRevertsRow()
    {
        var worker = new ThrowingWorkerClient { ThrowOnSetTaskDone = new Exception("mark done offline") };
        var vm = new TasksIslandViewModel(new TestDbFactory(NewContext), worker);

        string? reportedError = null;
        vm.ErrorReported += msg => reportedError = msg;

        var row = new TaskRowViewModel { Id = "task-toggle-done-1", Status = TaskStatus.Idle, Done = false };
        await vm.ToggleDoneCommand.ExecuteAsync(row);

        Assert.NotNull(reportedError);
        Assert.Contains("mark done offline", reportedError);
        Assert.False(row.Done);
        Assert.Equal(TaskStatus.Idle, row.Status);
    }

    [Fact]
    public async Task ToggleDone_Untoggle_WhenWorkerThrows_RaisesErrorReported_AndRevertsRow()
    {
        var worker = new ThrowingWorkerClient { ThrowOnUnsetTaskDone = new Exception("unmark done offline") };
        var vm = new TasksIslandViewModel(new TestDbFactory(NewContext), worker);

        string? reportedError = null;
        vm.ErrorReported += msg => reportedError = msg;

        var row = new TaskRowViewModel { Id = "task-toggle-done-2", Status = TaskStatus.Done, Done = true };
        await vm.ToggleDoneCommand.ExecuteAsync(row);

        Assert.NotNull(reportedError);
        Assert.Contains("unmark done offline", reportedError);
        Assert.True(row.Done);
        Assert.Equal(TaskStatus.Done, row.Status);
    }

    [Fact]
    public async Task ToggleDone_MarkDone_WhenWorkerSucceeds_UpdatesRow_NoError()
    {
        var worker = new ThrowingWorkerClient();
        var vm = new TasksIslandViewModel(new TestDbFactory(NewContext), worker);

        string? reportedError = null;
        vm.ErrorReported += msg => reportedError = msg;

        var row = new TaskRowViewModel { Id = "task-toggle-done-3", Status = TaskStatus.Idle, Done = false };
        await vm.ToggleDoneCommand.ExecuteAsync(row);

        Assert.Null(reportedError);
        Assert.True(row.Done);
        Assert.Equal(TaskStatus.Done, row.Status);
    }

    [Fact]
    public async Task RemoveFromQueue_WhenWorkerThrows_RaisesErrorReported_AndRevertsRow()
    {
        var worker = new ThrowingWorkerClient { ThrowOnDequeueTask = new Exception("dequeue offline") };
        var vm = new TasksIslandViewModel(new TestDbFactory(NewContext), worker);

        string? reportedError = null;
        vm.ErrorReported += msg => reportedError = msg;

        var row = new TaskRowViewModel { Id = "task-dequeue-1", Status = TaskStatus.Queued };
        await vm.RemoveFromQueueCommand.ExecuteAsync(row);

        Assert.NotNull(reportedError);
        Assert.Contains("dequeue offline", reportedError);
        Assert.Equal(TaskStatus.Queued, row.Status);
    }

    [Fact]
    public async Task RemoveFromQueue_CascadesToQueuedChildren_ViaGuardedHubCall()
    {
        var listId = Guid.NewGuid().ToString();
        var parentId = Guid.NewGuid().ToString();
        var childId = Guid.NewGuid().ToString();
        await using (var db = NewContext())
        {
            db.Lists.Add(new ListEntity { Id = listId, Name = "L", CreatedAt = DateTime.UtcNow });
            db.Tasks.Add(new TaskEntity
            {
                Id = parentId, ListId = listId, Title = "parent", Status = TaskStatus.Queued,
                Number = 1, CreatedAt = DateTime.UtcNow,
            });
            db.Tasks.Add(new TaskEntity
            {
                Id = childId, ListId = listId, Title = "child", Status = TaskStatus.Queued,
                Number = 2, ParentTaskId = parentId, BlockedByTaskId = parentId, CreatedAt = DateTime.UtcNow,
            });
            await db.SaveChangesAsync();
        }

        var worker = new ThrowingWorkerClient();
        var vm = new TasksIslandViewModel(new TestDbFactory(NewContext), worker);
        var parentRow = new TaskRowViewModel { Id = parentId, Status = TaskStatus.Queued, HasQueuedSubtasks = true };
        var childRow = new TaskRowViewModel { Id = childId, ParentTaskId = parentId, Status = TaskStatus.Queued, BlockedByTaskId = parentId };
        vm.Items.Add(parentRow);
        vm.Items.Add(childRow);

        await vm.RemoveFromQueueCommand.ExecuteAsync(parentRow);

        Assert.Contains(childId, worker.DequeuedTaskIds);
        Assert.Contains(parentId, worker.DequeuedTaskIds);
        Assert.Equal(TaskStatus.Idle, childRow.Status);
        Assert.Null(childRow.BlockedByTaskId);
        Assert.Equal(TaskStatus.Idle, parentRow.Status);
        Assert.False(parentRow.HasQueuedSubtasks);
    }
}