added TODOs for many things that need to be done in the backend

src/main/java/linux/general/hackyquizbot/QuizBackend.java

@@ -1,48 +1,98 @@
 package linux.general.hackyquizbot;
 
+import java.util.ArrayList;
+
 public class QuizBackend {
 
+	private static Question[] allQuestions;
+	private static String[] categories;
+	
+	static {
+		//TODO: populate allQuestions
+		//TODO: populate categories
+	}
+	
 	public static String[] getCategories() {
-		return null;
+		return categories;
 	}
 
 	public static Question getRandomQuestionForCategory(String category) {
+		//TODO: loop
+			//TODO: pick random question
+			//TODO: check if question is in category, return if it is
+		return null;
+	}
+	
+	public static Question getNewRandomQuestionForCategory(String discordUserID, String category) {
+		//TODO: get list of previously displayed questions for that user
+			//TODO: retrieve list of answers that user has given to get the question IDs from there
+		//TODO: find a random question that isn’t on said list
+		//TODO: add the question to said list and return it
 		return null;
 	}
 
 	public static int getScoreForUser(String discordUserID) {
-		return 0;
+		int score = 0;
+		//TODO: iterate over all questions
+			//TODO: get achieved score for the user for the question
+			//TODO: add to score
+		return score;
 	}
 
 	public static class Question {
 		
+		private String text;
+		private char[] validAnswers;
+		private char[] correctAnswers;
+		private int scoreValue;
+		private int ID;
+		private ArrayList<String> categories = new ArrayList<String>();
+		
 		/**
-		 * 
+		 * @param ID unique ID for the question
 		 * @param question The string for the question text
-		 * @param answers The multiple choice answers 
+		 * @param answers The multiple choice answers
 		 * @param mask A mask to be laid over answers to decide which answers are correct and which aren’t
 		 * @param scoreValue See getQuestionScoreValue()
 		 */
-		public Question(String question, String[] answers, boolean[] mask, int scoreValue) {
-
+		public Question(int ID, String question, String[] answers, boolean[] mask, int scoreValue) {
+			//TODO: build text, valid answers and correct answers
+			this.ID = ID;
+			this.scoreValue = scoreValue;
+		}
+		
+		//TODO: need a way to get back from the answer letter to the text answer and vice versa
+		
+		public boolean isInCategory(String category) {
+			for (int i=0; i<this.categories.size(); i++) {
+				if (this.categories.get(i).equals(category)) return true;
+			}
+			return false;
+		}
+		
+		public void addCategory(String category) {
+			this.categories.add(category);
 		}
 
 		/**
 		 * @return the full question text including multiple choice options with letters that correspond to getValidResponses()
 		 */
 		public String getQuestionTextWithOptions() {
-			return null;
+			return text;
 		}
 
 		/**
 		 * @return a character array containing all the valid answers
 		 */
 		public char[] getValidResponses() {
-			return null;
+			return this.validAnswers;
 		}
 		
+		/**
+		 * @return a character array containing all the correct answers
+		 */
 		public char[] getCorrectResponses() {
-			return null;
+			return this.correctAnswers;
 		}
 
 		/**
@@ -53,7 +103,7 @@ public class QuizBackend {
 		 * @param answer
 		 */
 		public void addAnswer(String discordUserID, char answer) {
-
+			//TODO: store question ID, user ID, and the chosen answer
 		}
 
 		/**
@@ -64,6 +114,12 @@ public class QuizBackend {
 		 * @return
 		 */
 		public int getQuestionScoreValue() {
+			return this.scoreValue;
+		}
+		
+		public int getAchievedScore(String discordUserID) {
+			//TODO: retrieve given answers by user ID and question ID
+			//TODO: calculate score
 			return 0;
 		}
 	}