using LehrerApp.Core.Interfaces;

namespace LehrerApp.Data;

public class LiteAttachmentStorage(LiteDbContext db) : IAttachmentStorage
{
    public string Upload(string fileName, Stream content)
    {
        if (content.Length > IAttachmentStorage.MaxSizeBytes)
            throw new InvalidOperationException(
                $"Datei ist größer als {IAttachmentStorage.MaxSizeBytes / 1024 / 1024} MB.");

        var id = Guid.NewGuid().ToString("N");
        db.Attachments.Upload(id, fileName, content);
        return id;
    }

    public Stream? OpenRead(string storageId) =>
        db.Attachments.Exists(storageId) ? db.Attachments.OpenRead(storageId) : null;

    public void Delete(string storageId) => db.Attachments.Delete(storageId);
}