using NSubstitute;
using PnvPanel.Application.Common.Interfaces;
using PnvPanel.Application.Media;
using PnvPanel.Application.Media.GetImage;
using PnvPanel.Application.Tests.TestSupport;
using PnvPanel.Domain.Media;
using Xunit;

namespace PnvPanel.Application.Tests.Media;

public class GetMediaImageQueryHandlerTests
{
    private readonly IFileStorage _fileStorage = Substitute.For<IFileStorage>();

    [Fact]
    public async Task Handle_WhenImageExists_ReturnsContentStream()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var image = MediaImage.Create("shot.png", "stored-name", "image/png", 10, Guid.NewGuid());
        dbContext.MediaImages.Add(image);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        _fileStorage
            .OpenReadAsync("stored-name", Arg.Any<CancellationToken>())
            .Returns(new MemoryStream([1, 2, 3]));

        var handler = new GetMediaImageQueryHandler(dbContext, _fileStorage);

        var result = await handler.Handle(
            new GetMediaImageQuery(image.Id),
            CancellationToken.None
        );

        Assert.True(result.IsSuccess);
        Assert.Equal("image/png", result.Value.ContentType);
        Assert.Equal("shot.png", result.Value.FileName);
    }

    [Fact]
    public async Task Handle_WhenRowExistsButFileMissing_ReturnsNotFound()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var image = MediaImage.Create("shot.png", "stored-name", "image/png", 10, Guid.NewGuid());
        dbContext.MediaImages.Add(image);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        _fileStorage
            .OpenReadAsync("stored-name", Arg.Any<CancellationToken>())
            .Returns((Stream?)null);

        var handler = new GetMediaImageQueryHandler(dbContext, _fileStorage);

        var result = await handler.Handle(
            new GetMediaImageQuery(image.Id),
            CancellationToken.None
        );

        Assert.False(result.IsSuccess);
        Assert.Equal(MediaErrors.NotFound, result.Error);
    }

    [Fact]
    public async Task Handle_WhenImageUnknown_ReturnsNotFound()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var handler = new GetMediaImageQueryHandler(dbContext, _fileStorage);

        var result = await handler.Handle(
            new GetMediaImageQuery(Guid.NewGuid()),
            CancellationToken.None
        );

        Assert.False(result.IsSuccess);
        Assert.Equal(MediaErrors.NotFound, result.Error);
    }
}