private List <FriendRelationEntity> FindRelations(FriendRelationRequest request)
{
return(_context.FriendRelationEntity.Where(x =>
((x.FriendListOwnerID == request.FriendListOwnerID) &&
(x.FriendID == request.FriendID)) ||
((x.FriendID == request.FriendListOwnerID) &&
(x.FriendListOwnerID == request.FriendID)))
.ToList());
}
public string Accept(FriendRelationRequest request)
{
if (request.FriendListOwnerID == request.FriendID)
{
return(Error.CANNOT_ADD_YOURSELF);
}
var relation = _context.FriendRelationEntity.FirstOrDefault(x =>
(x.FriendListOwnerID == request.FriendListOwnerID) &&
(x.FriendID == request.FriendID));
if (relation == null || relation.Accepted)
{
return(Error.RELATION_DOES_NOT_EXIST_OR_ACCEPTED);
}
relation.Accepted = true;
_context.SaveChanges();
return(Error.OK);
}
public string Delete(FriendRelationRequest request)
{
if (request.FriendListOwnerID == request.FriendID)
{
return(Error.CANNOT_DELETE_YOURSELF);
}
var relations = FindRelations(request);
if (relations.Count != 2)
{
return(string.Format(Error.RELATION_DOES_NOT_EXIST, request.FriendID, request.FriendListOwnerID));
}
foreach (var relation in relations)
{
_context.FriendRelationEntity.Remove(relation);
}
_context.SaveChanges();
return(Error.OK);
}
public string Add(FriendRelationRequest request)
{
if (request.FriendListOwnerID == request.FriendID)
{
return(Error.CANNOT_ADD_YOURSELF);
}
var relations = FindRelations(request);
if (relations.Count == 2)
{
return(Accept(request));
}
if (_context.UserEntity.FirstOrDefault(x => x.ID == request.FriendID) == null)
{
return(string.Format(Error.CANNOT_FIND_USER, request.FriendID));
}
if (_context.UserEntity.FirstOrDefault(x => x.ID == request.FriendListOwnerID) == null)
{
return(string.Format(Error.CANNOT_FIND_USER, request.FriendListOwnerID));
}
_context.FriendRelationEntity.Add(new FriendRelationEntity
{
FriendListOwnerID = request.FriendListOwnerID,
FriendID = request.FriendID,
Accepted = true
});
_context.FriendRelationEntity.Add(new FriendRelationEntity
{
FriendListOwnerID = request.FriendID,
FriendID = request.FriendListOwnerID,
Accepted = false
});
_context.SaveChanges();
return(Error.OK);
}
