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concept User {
  long userID;
  S name;
  
  toString { ret name; }
}

concept Channel {
  long channelID;
  S name;
  
  toString { ret name; }
}

sclass Reaction {
  long created;
  User user;
  S emoji;
  
  toString { ret emoji + " (" + user + ")"; }
}

concept Line {
  long msgID;
  bool bot, isPrivate;
  Channel channel;
  User author;
  S text;
  new L<Reaction> reactions;
}

cmodule GLines > DynCRUD<Line> {
  // API
  
  User uniqUser(long userID) {
    ret uniq_sync User(+userID);
  }
  
  Channel uniqChannel(long channelID) {
    ret uniq_sync Channel(+channelID);
  }
  
  Reaction nuReaction(O... params) {
    ret nu Reaction(params);
  }
  
  long getChannelID(S name) {
    ret getLongOrZero channelID(conceptWhere Channel(name := dropPrefix("#", name)));
  }
  
  Line lastLineInChannel(long channelID) {
    Channel channel = conceptWhere Channel(+channelID);
    if (channel == null) null;
    ret last(conceptsWhere Line(+channel));
  }
  
  Line nextToLastLineInChannel(long channelID) {
    Channel channel = conceptWhere Channel(+channelID);
    if (channel == null) null;
    ret nextToLast(conceptsWhere Line(+channel));
  }
  
  L<Line> linesInChannelBy(long channelID, long userID) {
    Channel channel = conceptWhere Channel(+channelID);
    if (channel == null) null;
    User user = conceptWhere User(+userID);
    if (user == null) null;
    ret conceptsWhere Line(+channel, author := user);
  }
  
  L<Line> linesInChannel(long channelID) {
    Channel channel = conceptWhere Channel(+channelID);
    if (channel == null) null;
    ret conceptsWhere Line(+channel);
  }
  
  long idForChannel(S name) {
    ret getChannelID(name);
  }
  
  // attention: Discord user names may change
  long idForUser(S name) {
    ret getLong userID(conceptWhere User(+name));
  }
}