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: Stop/Enqueue/Dequeue/Reset&Retry used to swallow worker failures with a
// bare `catch { }` — nothing surfaced in the footer strip. These now raise ErrorReported.
public class DetailsIslandErrorFeedbackTests : IDisposable
{
    private readonly string _dbPath;

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

        // Loc is a process-wide ambient singleton other tests also mutate — pin it to
        // the real locale data so this test's assertions don't depend on run order.
        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 TestDbFactory : IDbContextFactory<ClaudeDoDbContext>
    {
        private readonly Func<ClaudeDoDbContext> _create;
        public TestDbFactory(Func<ClaudeDoDbContext> create) => _create = create;
        public ClaudeDoDbContext CreateDbContext() => _create();
    }

    private sealed class NullServiceProvider : IServiceProvider
    {
        public object? GetService(Type serviceType) => null;
    }

    private sealed class StubNotesApi : ClaudeDo.Ui.Services.Interfaces.INotesApi
    {
        public Task<List<DailyNoteDto>> ListAsync(DateOnly day) =>
            Task.FromResult(new List<DailyNoteDto>());
        public Task<DailyNoteDto?> AddAsync(DateOnly day, string text) =>
            Task.FromResult<DailyNoteDto?>(null);
        public Task UpdateAsync(string id, string text) => Task.CompletedTask;
        public Task DeleteAsync(string id) => Task.CompletedTask;
    }

    private sealed class ThrowingWorkerClient : StubWorkerClient
    {
        public bool Connected { get; set; } = true;
        public override bool IsConnected => Connected;
        public Exception? ThrowOnCancelTask;
        public Exception? ThrowOnSetTaskStatus;
        public Exception? ThrowOnSetTaskDone;
        public Exception? ThrowOnUnsetTaskDone;

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

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

        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;
        }
    }

    private DetailsIslandViewModel BuildVm(StubWorkerClient worker)
    {
        var factory = new TestDbFactory(NewContext);
        return new DetailsIslandViewModel(
            factory, worker, new NullServiceProvider(), new StubNotesApi(), new ClaudeDo.Ui.Services.MergeCoordinator());
    }

    [Fact]
    public async Task Stop_WhenWorkerOffline_ReportsError()
    {
        var worker = new ThrowingWorkerClient { Connected = false };
        var vm = BuildVm(worker);
        vm.Bind(new TaskRowViewModel { Id = "task-stop-offline", Status = TaskStatus.Running });
        vm.Monitor.ApplyState(TaskStatus.Running);

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

        await vm.StopCommand.ExecuteAsync(null);

        Assert.NotNull(reportedError);
        Assert.NotEqual(string.Empty, reportedError);
    }

    [Fact]
    public async Task Stop_WhenWorkerThrows_ReportsError()
    {
        var worker = new ThrowingWorkerClient { ThrowOnCancelTask = new Exception("cancel slot busy") };
        var vm = BuildVm(worker);
        vm.Bind(new TaskRowViewModel { Id = "task-stop-throw", Status = TaskStatus.Running });
        vm.Monitor.ApplyState(TaskStatus.Running);

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

        await vm.StopCommand.ExecuteAsync(null);

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

    [Fact]
    public async Task Enqueue_WhenWorkerThrows_ReportsError()
    {
        var worker = new ThrowingWorkerClient { ThrowOnSetTaskStatus = new Exception("queue offline") };
        var vm = BuildVm(worker);
        vm.Bind(new TaskRowViewModel { Id = "task-enqueue-throw", Status = TaskStatus.Idle });
        vm.Monitor.ApplyState(TaskStatus.Idle);

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

        await vm.EnqueueCommand.ExecuteAsync(null);

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

    [Fact]
    public async Task Dequeue_WhenWorkerThrows_ReportsError()
    {
        var worker = new ThrowingWorkerClient { ThrowOnSetTaskStatus = new Exception("dequeue offline") };
        var vm = BuildVm(worker);
        vm.Bind(new TaskRowViewModel { Id = "task-dequeue-throw", Status = TaskStatus.Queued });
        vm.Monitor.ApplyState(TaskStatus.Queued);

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

        await vm.DequeueCommand.ExecuteAsync(null);

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

    [Fact]
    public async Task ResetAndRetry_WhenWorkerThrows_ReportsError()
    {
        var worker = new ThrowingWorkerClient { ThrowOnSetTaskStatus = new Exception("reset offline") };
        var vm = BuildVm(worker);
        vm.Bind(new TaskRowViewModel { Id = "task-reset-throw", Status = TaskStatus.Failed });
        vm.Monitor.ApplyState(TaskStatus.Failed);
        vm.ConfirmAsync = _ => Task.FromResult(true);

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

        await vm.ResetAndRetryCommand.ExecuteAsync(null);

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

    [Fact]
    public async Task ToggleDone_MarkDone_WhenWorkerThrows_ReportsError_AndRevertsTask()
    {
        var worker = new ThrowingWorkerClient { ThrowOnSetTaskDone = new Exception("mark done offline") };
        var vm = BuildVm(worker);
        vm.Bind(new TaskRowViewModel { Id = "task-toggle-done-throw", Status = TaskStatus.Idle, Done = false });
        vm.Monitor.ApplyState(TaskStatus.Idle);

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

        await vm.ToggleDoneCommand.ExecuteAsync(null);

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

    [Fact]
    public async Task ToggleDone_Untoggle_WhenWorkerThrows_ReportsError_AndRevertsTask()
    {
        var worker = new ThrowingWorkerClient { ThrowOnUnsetTaskDone = new Exception("unmark done offline") };
        var vm = BuildVm(worker);
        vm.Bind(new TaskRowViewModel { Id = "task-untoggle-done-throw", Status = TaskStatus.Done, Done = true });
        vm.Monitor.ApplyState(TaskStatus.Done);

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

        await vm.ToggleDoneCommand.ExecuteAsync(null);

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

    [Fact]
    public async Task ToggleDone_MarkDone_WhenWorkerSucceeds_UpdatesTask_NoError()
    {
        var worker = new ThrowingWorkerClient();
        var vm = BuildVm(worker);
        vm.Bind(new TaskRowViewModel { Id = "task-toggle-done-ok", Status = TaskStatus.Idle, Done = false });
        vm.Monitor.ApplyState(TaskStatus.Idle);

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

        await vm.ToggleDoneCommand.ExecuteAsync(null);

        Assert.Null(reportedError);
        Assert.True(vm.Task!.Done);
        Assert.Equal(TaskStatus.Done, vm.Task!.Status);
    }
}