//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
public static List <ChatMessage> GetChatMessages(this ChatDBContext db, int ChatId, int take = 50, int offset = 0)
{
// SELECT * FROM ChatMessages WHERE ChatId=5 Take ORDER BY Id Descending
List <ChatMessage> temp = db.ChatMessages.OrderByDescending(x => x.Id).Where(x => x.ChatId == ChatId).Skip(offset).Take(take).ToList();
return(temp);
}
public static GroupChat AddChat(this ChatDBContext db, String ChatName, String CreatorId)
{
GroupChat gc = new GroupChat();
gc.ChatName = ChatName;
gc.CreateTime = DateTime.Now;
Chats_Participants cp = new Chats_Participants();
cp.AddTime = gc.CreateTime;
cp.UserId = CreatorId;
gc.Participants.Add(cp);
db.Chats.Add(gc);
int temp = db.SaveChanges();
if (temp == 2)
{
return(gc);
}
else
{
return(null);
}
}
public static ChatMessage AddMessage(this ChatDBContext db, int ChatId, string UserId, String message)
{
GroupChat ch = db.Chats.Where(x => x.Id == ChatId && x.Participants.Any(y => y.UserId == UserId && y.ChatId == ChatId)).Single();
if (ch != null)
{
ChatMessage m = new ChatMessage();
m.MessageText = message;
m.SenderId = UserId;
m.SentTime = DateTime.Now;
ch.Messages.Add(m);
db.SaveChanges();
return(m);
}
else
{
//ToDo: log hack attempt
return(null);
}
}
public static GroupChat AddParticipant(this ChatDBContext db, int ChatId, string ParticipantId, string InvitatorId)
{
Chats_Participants cp = db.Chats_Participants.Where(x => x.ChatId == ChatId && x.UserId == ParticipantId).SingleOrDefault();
if (cp == null)
{
cp = new Chats_Participants();
cp.InvitatorId = InvitatorId;
cp.UserId = ParticipantId;
cp.ChatId = ChatId;
cp.AddTime = DateTime.Now;
db.Chats_Participants.Add(cp);
int res = db.SaveChanges();
if (res == 1)
{
return(cp.Chat);
}
}
return(null);
}
public static List <String> ChatUsers(this ChatDBContext db, int ChatId)
{
List <String> AllUsers = db.Chats_Participants.Where(x => x.ChatId == ChatId).Select(x => x.UserId).ToList();
return(AllUsers);
}
public static List <uint> GetUserChatsNames(this ChatDBContext db, String UserId)
{
List <uint> temp = db.Chats_Participants.Where(x => x.UserId == UserId).Select(x => x.Id).ToList();
return(temp);
}
