using Microsoft.EntityFrameworkCore;
using LiteCqrs;
using PnvPanel.Application.Common.Interfaces;
using PnvPanel.Application.Common.Models;

namespace PnvPanel.Application.Media.GetImage;

public sealed class GetMediaImageQueryHandler(IAppDbContext dbContext, IFileStorage fileStorage)
    : IQueryHandler<GetMediaImageQuery, Result<MediaImageContent>>
{
    public async Task<Result<MediaImageContent>> Handle(
        GetMediaImageQuery query,
        CancellationToken cancellationToken
    )
    {
        var image = await dbContext
            .MediaImages.AsNoTracking()
            .FirstOrDefaultAsync(i => i.Id == query.ImageId, cancellationToken);

        if (image is null)
            return Result.Failure<MediaImageContent>(MediaErrors.NotFound);

        var stream = await fileStorage.OpenReadAsync(image.StoredFileName, cancellationToken);
        if (stream is null)
            return Result.Failure<MediaImageContent>(MediaErrors.NotFound);

        return Result.Success(new MediaImageContent(stream, image.ContentType, image.FileName));
    }
}