Implement random flashcard review mode

Author: wendelinwemhoener

flashcard.txt

@@ -3,3 +3,4 @@ flash1 | dfdfdf | - | - | -
 adfdf | dfdfdf | - | - | -
 dfdfdf | dfdfdfdfdf | - | - | -
 who is this | me | - | - | -
+dfdfdfdaaaaaaaaaaaaa | dd | - | - | -

src/main/java/seedu/duke/flashcard/Flashcard.java

@@ -12,7 +12,11 @@ public class Flashcard {
     private String backText;
     private ArrayList<String> tags;
     private ArrayList<FlashcardReview> reviews;
-    private LocalDateTime nextReviewOn;
+    private LocalDateTime lastReviewOn;
+
+    public void setLastReviewOn(LocalDateTime lastReviewOn) {
+        this.lastReviewOn = lastReviewOn;
+    }
 
     public Flashcard(String frontText, String backText) {
         this.frontText = frontText;
@@ -21,7 +25,7 @@ public Flashcard(String frontText, String backText) {
         tags = new ArrayList<>();
         reviews = new ArrayList<>();
 
-        nextReviewOn = null;
+        lastReviewOn = null;
     }
 
     public String getFrontText() {
@@ -36,6 +40,6 @@ public String toString() {
         return "front text: " + frontText + System.lineSeparator()
                 + "back text: " + backText + System.lineSeparator()
                 + "tags: " + tags.toString() + System.lineSeparator()
-                + "next review due on: " + nextReviewOn + System.lineSeparator();
+                + "next review due on: " + lastReviewOn + System.lineSeparator();
     }
 }

src/main/java/seedu/duke/flashcard/command/StartReviewCommand.java

@@ -3,6 +3,7 @@
 package seedu.duke.flashcard.command;
 
 import seedu.duke.flashcard.FlashcardList;
+import seedu.duke.flashcard.review.FlashcardReview;
 import seedu.duke.flashcard.review.RandomReviewMode;
 import seedu.duke.flashcard.review.ReviewByTagMode;
 import seedu.duke.flashcard.review.ReviewMode;
@@ -34,25 +35,25 @@ public void execute(Scanner scanner, FlashcardList flashcardList) {
             return;
         }
 
-        ReviewMode reviewMode = createReviewMode(choice);
+        ReviewMode reviewMode = createReviewMode(choice, flashcardList);
 
         if (reviewMode instanceof RandomReviewMode) {
-
+            reviewMode.startReviewSession(scanner);
         } else {
             System.out.println("This review mode hasn't yet been implemented." +
                     " Sorry!");
         }
     }
 
-    private ReviewMode createReviewMode(String choice) {
+    private ReviewMode createReviewMode(String choice, FlashcardList flashcardList) {
         ReviewMode reviewMode = null;
 
         if (choice.equals("a")) {
-            reviewMode = new RandomReviewMode();
+            reviewMode = new RandomReviewMode(flashcardList);
         } else if (choice.equals("b")) {
-            reviewMode = new SpacedRepetitionReviewMode();
+            reviewMode = new SpacedRepetitionReviewMode(flashcardList);
         } else if (choice.equals("c")) {
-            reviewMode = new ReviewByTagMode();
+            reviewMode = new ReviewByTagMode(flashcardList);
         }
 
         assert reviewMode != null;

src/main/java/seedu/duke/flashcard/review/RandomReviewMode.java

@@ -2,6 +2,25 @@
 
 package seedu.duke.flashcard.review;
 
+import seedu.duke.flashcard.Flashcard;
+import seedu.duke.flashcard.FlashcardList;
+
+import java.util.ArrayList;
+import java.util.Random;
+
 public class RandomReviewMode extends ReviewMode {
+    public RandomReviewMode(FlashcardList flashcardList) {
+        super(flashcardList);
+    }
+
+    public String getReviewModeName() {
+        return "random review mode";
+    }
+
+    protected Flashcard pickFlashcard() {
+        ArrayList<Flashcard> flashcards = flashcardList.getFlashcards();
+        Random random = new Random();
 
+        return flashcards.get(random.nextInt(flashcards.size()));
+    }
 }

src/main/java/seedu/duke/flashcard/review/ReviewByTagMode.java

@@ -1,4 +1,18 @@
 package seedu.duke.flashcard.review;
 
+import seedu.duke.flashcard.Flashcard;
+import seedu.duke.flashcard.FlashcardList;
+
 public class ReviewByTagMode extends ReviewMode {
+    public ReviewByTagMode(FlashcardList flashcardList) {
+        super(flashcardList);
+    }
+
+    public String getReviewModeName() {
+        return "review by tag mode";
+    }
+
+    protected Flashcard pickFlashcard() {
+        return null;
+    }
 }

src/main/java/seedu/duke/flashcard/review/ReviewMode.java

@@ -2,10 +2,58 @@
 
 package seedu.duke.flashcard.review;
 
+import seedu.duke.flashcard.Flashcard;
+import seedu.duke.flashcard.FlashcardList;
+
+import java.time.LocalDateTime;
+import java.util.Scanner;
+
 public abstract class ReviewMode {
-    public void startReviewSession() {
+    protected FlashcardList flashcardList;
+
+    public ReviewMode(FlashcardList flashcardList) {
+        this.flashcardList = flashcardList;
+    }
+
+    public abstract String getReviewModeName();
+
+    public void startReviewSession(Scanner scanner) {
+        System.out.println("    [Review session has been started]");
+        System.out.println("    [Review mode is: " + getReviewModeName() + "]");
+        System.out.println();
+
+        while (true) {
+            Flashcard flashcardToReview = pickFlashcard();
 
+            printFlashcardFrontTextPrompt(flashcardToReview);
+
+            String input = scanner.nextLine();
+            boolean shouldTerminate = input.equals("quit") || input.equals("q");
+            if (shouldTerminate) {
+                break;
+            }
+
+            System.out.println("    The actual back text is: " + flashcardToReview.getBackText());
+            System.out.println();
+
+            flashcardToReview.setLastReviewOn(LocalDateTime.now());
+        }
+
+        System.out.println("    Success! You have ended this review session.");
     }
 
-    public abstract void reviewSingleFlashcard();
+    protected abstract Flashcard pickFlashcard();
+
+    protected void printFlashcardFrontTextPrompt(Flashcard flashcardToReview) {
+        System.out.println("    " + "-".repeat(76));
+        System.out.println("    The front text is: " + flashcardToReview.getFrontText());
+        System.out.println();
+
+        System.out.println("    [Think of the answer (the back text) in " +
+                "your head]");
+        System.out.println("    [Press <ENTER> when you are ready to " +
+                "compare it,]");
+        System.out.println("    [or enter 'q' or 'quit' to end this " +
+                "review session]");
+    }
 }

src/main/java/seedu/duke/flashcard/review/SpacedRepetitionReviewMode.java

@@ -2,5 +2,19 @@
 
 package seedu.duke.flashcard.review;
 
+import seedu.duke.flashcard.Flashcard;
+import seedu.duke.flashcard.FlashcardList;
+
 public class SpacedRepetitionReviewMode extends ReviewMode {
+    public SpacedRepetitionReviewMode(FlashcardList flashcardList) {
+        super(flashcardList);
+    }
+
+    public String getReviewModeName() {
+        return "spaced repetition mode";
+    }
+
+    protected Flashcard pickFlashcard() {
+        return null;
+    }
 }