Hacky-Quizbot/src/main/java/linux/general/hackyquizbot/QuizHandler.java

package linux.general.hackyquizbot;

import java.util.concurrent.ExecutionException;

import org.javacord.api.entity.message.Message;
import org.javacord.api.entity.user.User;

import com.vdurmont.emoji.EmojiParser;

import linux.general.hackyquizbot.QuizBackend.Question;

public class QuizHandler {
	private User user;
	private Question lastQuestion;

	public QuizHandler(User user) {
		this.user = user;
		if (QuizBackend.shouldGetMoreQuestions(user.getIdAsString())) {
			try {
				Message message = user.sendMessage("Hi! I'm Hacky.\n"
						+ "I will be sending you a bunch of multiple-choice questions. "
						+ "You can answer by selecting one or more of the reactions on the message and confirm your selection by selecting the :white_check_mark: reaction."
						+ " Please contact @BodgeMaster#0344 if there are any issues.\n\n"
						+ "Select the :white_check_mark: reaction to continue.").get();
				message.addReaction(EmojiParser.parseToUnicode(":white_check_mark:"));
				message.addReactionAddListener(event -> {
					// HACK: Testing for an exception to find out whether the event was caused by a
					// user or by the bot itself because reactions added by the bot allow to check
					// for user where reactions added by actual users don’t.
					try {
						if (!event.getUser().get().isYourself() && event.getReaction().get().getEmoji()
								.equalsEmoji(EmojiParser.parseToUnicode(":white_check_mark:"))) {
							event.getMessage().get().getChannel().sendMessage(
									"This should not work. If you ever see this message, please inform @BodgeMaster#0344 that there is more to this arbitrary limitation in the Discord API than expected.");
						}
					} catch (Exception e) {
						System.err.println("Assuming the reaction event was caused by the user...");
						System.err.println("User ID: "+this.user.getIdAsString()); //test if we can get the user ID that way
					}
					// TODO: trigger question dispatch
					// TODO: remove ReactionAddListener
				});
			} catch (InterruptedException | ExecutionException e) {
				// TODO Auto-generated catch block
				System.err.println("Something went wrong while trying to get the sent message object.");
				e.printStackTrace();
			}
			// TODO: add white question mark reaction

			// TODO: add reaction handler (preferably to channel?)
		} else {
			user.sendMessage(
					"You have already had the maximum amount of questions that you can get with the current question set.");
		}
	}

}