using ClaudeDo.Data;
using ClaudeDo.Localization;
using ClaudeDo.Ui.Localization;
using ClaudeDo.Ui.Services;
using ClaudeDo.Ui.ViewModels;
using ClaudeDo.Ui.ViewModels.Conflicts;
using ClaudeDo.Ui.ViewModels.Islands;
using ClaudeDo.Ui.ViewModels.Modals;
using Microsoft.EntityFrameworkCore;

namespace ClaudeDo.Ui.Tests.ViewModels;

// "New list" pre-creates the DB row and then opens List Settings on it. Cancelling (or closing)
// that modal used to leave an untitled empty list behind — CreateListAsync rolls the row back
// unless the modal reports Saved (or Deleted, which already handled itself).
public class ListsIslandCreateListCancelTests : IDisposable
{
    private readonly string _dbPath;

    public ListsIslandCreateListCancelTests()
    {
        _dbPath = Path.Combine(Path.GetTempPath(), $"claudedo_newlist_cancel_{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);
    }

    // Stands in for the modal window: either leaves the VM untouched (cancel / window close)
    // or runs its Save command.
    private sealed class FakeDialogService(bool save) : IDialogService
    {
        public Task ShowListSettingsAsync(ListSettingsModalViewModel vm) =>
            save ? vm.SaveCommand.ExecuteAsync(null) : Task.CompletedTask;

        public Task ShowAboutAsync(AboutModalViewModel vm) => throw new NotImplementedException();
        public Task ShowWeeklyReportAsync(WeeklyReportModalViewModel vm) => throw new NotImplementedException();
        public Task ShowUsageMonitorAsync(UsageMonitorModalViewModel vm) => throw new NotImplementedException();
        public Task ShowSettingsAsync(SettingsModalViewModel vm) => throw new NotImplementedException();
        public Task ShowRepoImportAsync(RepoImportModalViewModel vm) => throw new NotImplementedException();
        public Task ShowWorktreesOverviewAsync(WorktreesOverviewModalViewModel vm) => throw new NotImplementedException();
        public Task<IReadOnlyList<string>?> ShowMergeHelperSelectionAsync(MergeHelperSelectionModalViewModel vm) => throw new NotImplementedException();
        public Task ShowWorkerConnectionAsync(WorkerConnectionModalViewModel vm) => throw new NotImplementedException();
        public Task ShowConflictResolverAsync(ConflictResolverViewModel vm) => throw new NotImplementedException();
        public Task ShowLogVisualizerAsync(LogVisualizerViewModel vm) => throw new NotImplementedException();
        public Task<bool> ConfirmAsync(string message) => Task.FromResult(true);
        public Task ShowErrorAsync(string message) => Task.CompletedTask;
        public void ShowMissionControl(MissionControlViewModel vm) => throw new NotImplementedException();
        public void ShowCheatSheets(CheatSheetsViewModel vm) => throw new NotImplementedException();
    }

    private sealed class ListSettingsProvider(Func<ListSettingsModalViewModel> create) : IServiceProvider
    {
        public object? GetService(Type serviceType) =>
            serviceType == typeof(ListSettingsModalViewModel) ? create() : null;
    }

    private async Task<ListsIslandViewModel> RunCreateListAsync(bool save)
    {
        var factory = new TestDbFactory(NewContext);
        var worker = new DefaultStub();
        var services = new ListSettingsProvider(() => new ListSettingsModalViewModel(worker, factory));
        var vm = new ListsIslandViewModel(factory, services) { Dialogs = new FakeDialogService(save) };
        await vm.LoadAsync();

        await vm.CreateListCommand.ExecuteAsync(null);
        return vm;
    }

    [Fact]
    public async Task CancellingListSettings_RemovesThePreCreatedList()
    {
        var vm = await RunCreateListAsync(save: false);

        await using var db = NewContext();
        Assert.Empty(db.Lists);
        Assert.Empty(vm.UserLists);
    }

    [Fact]
    public async Task SavingListSettings_KeepsTheNewList()
    {
        var vm = await RunCreateListAsync(save: true);

        await using var db = NewContext();
        Assert.Single(db.Lists);
        Assert.Single(vm.UserLists);
    }
}