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using Microsoft.EntityFrameworkCore;
using SixLabors.ImageSharp;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Timeline.Entities;
using Timeline.Models;
using Timeline.Services.Data;
namespace Timeline.Services.DatabaseManagement
{
public class TimelinePostContentToDataMigration : IDatabaseCustomMigration
{
private readonly IDataManager _dataManager;
public TimelinePostContentToDataMigration(IDataManager dataManager)
{
_dataManager = dataManager;
}
public string GetName() => "TimelinePostContentToData";
public async Task ExecuteAsync(DatabaseContext database, CancellationToken cancellationToken)
{
#pragma warning disable CS0618
var postEntities = await database.TimelinePosts.ToListAsync(cancellationToken);
foreach (var postEntity in postEntities)
{
if (postEntity.Content is null)
{
postEntity.Deleted = true;
}
else
{
if (postEntity.ContentType == "text")
{
var tag = await _dataManager.RetainEntry(Encoding.UTF8.GetBytes(postEntity.Content));
database.TimelinePostData.Add(new TimelinePostDataEntity
{
DataTag = tag,
Kind = MimeTypes.TextPlain,
Index = 0,
PostId = postEntity.Id,
LastUpdated = postEntity.LastUpdated
});
}
else
{
var data = await _dataManager.GetEntryAndCheck(postEntity.Content, "Old image content does not have corresponding data with the tag.");
var format = Image.DetectFormat(data);
database.TimelinePostData.Add(new TimelinePostDataEntity
{
DataTag = postEntity.Content,
Kind = format.DefaultMimeType,
Index = 0,
PostId = postEntity.Id,
LastUpdated = postEntity.LastUpdated
});
}
}
postEntity.Content = null;
postEntity.ContentType = null;
postEntity.ExtraContent = null;
}
await database.SaveChangesAsync(cancellationToken);
#pragma warning restore CS0618
}
}
}
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