using Duempelkas.App.Services;
using Duempelkas.App.Services.Models;
using Duempelkas.Infrastructure.Services;
using Xunit;

namespace Duempelkas.Tests;

public class FileOperationTests
{
    [Fact]
    public async Task Cancel_IsNeutral()
    {
        var service = new FileSaveService(new Dialog(null));
        Assert.Equal(FileOperationStatus.Cancelled, (await service.SaveFileAsync([1], "test.pdf")).Status);
    }

    [Fact]
    public async Task SaveAndFailure_AreDistinct_AndOpeningMissingFileIsError()
    {
        var folder = Path.Combine(Path.GetTempPath(), "duempelkas-files-" + Guid.NewGuid().ToString("N"));
        Directory.CreateDirectory(folder);
        try
        {
            var path = Path.Combine(folder, "Prüfung.pdf");
            var service = new FileSaveService(new Dialog(path));
            Assert.Equal(FileOperationStatus.Success, (await service.SaveFileAsync([1, 2, 3], "test.pdf")).Status);
            Assert.Equal(new byte[] { 1, 2, 3 }, await File.ReadAllBytesAsync(path));
            // A directory cannot be overwritten as a file; the existing file is preserved.
            Assert.Equal(FileOperationStatus.Error, (await new FileSaveService(new Dialog(folder)).SaveFileAsync([4], "test.pdf")).Status);
            Assert.Equal(FileOperationStatus.Error, (await service.OpenFileAsync(Path.Combine(folder, "missing.pdf"))).Status);
            Assert.Equal(new byte[] { 1, 2, 3 }, await File.ReadAllBytesAsync(path));
        }
        finally { Directory.Delete(folder, true); }
    }

    private sealed class Dialog(string? path) : IFileDialogService
    {
        public Task<string?> SaveAsync(string suggestedFileName) => Task.FromResult(path);
        public Task<string?> OpenBackupAsync() => Task.FromResult(path);
    }
}