From 77a2404c02bc0d557fa5d3493d6e21fb17475c35 Mon Sep 17 00:00:00 2001
From: junhyeong0411 <jazzdosa@kaist.ac.kr>
Date: Fri, 20 Oct 2023 15:50:33 +0900
Subject: [PATCH 01/17] delete assertion

---
 data/events/event.txt                                    | 1 +
 src/main/java/seedu/duke/calendar/EventStorage.java      | 2 --
 src/main/java/seedu/duke/flashcard/FlashcardStorage.java | 1 -
 3 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/data/events/event.txt b/data/events/event.txt
index a66b88d2c9..e78e097630 100644
--- a/data/events/event.txt
+++ b/data/events/event.txt
@@ -1,2 +1,3 @@
 submit v1.0 | 2023-10-29T23:59:59 | 2023-10-30T23:59:59 
 eat dinner | 2023-12-20T19:00 | 2023-12-20T20:00 
+a | 2023-12-12T12:12:12 | 2023-12-12T12:12:13 
diff --git a/src/main/java/seedu/duke/calendar/EventStorage.java b/src/main/java/seedu/duke/calendar/EventStorage.java
index d71325441c..4449e0cbed 100644
--- a/src/main/java/seedu/duke/calendar/EventStorage.java
+++ b/src/main/java/seedu/duke/calendar/EventStorage.java
@@ -33,8 +33,6 @@ public boolean isStorageAvailable(){
      */
     private Event loadEvent(String[] tokens){
 
-        assert tokens.length == 3: "Token length should be 3";
-
         String name = tokens[0].trim();
         LocalDateTime from = LocalDateTime.parse(tokens[1].trim());
         LocalDateTime to = LocalDateTime.parse(tokens[2].trim());
diff --git a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
index 780b80ba79..a89b91931c 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
@@ -34,7 +34,6 @@ public boolean isStorageAvailable(){
      */
     private Flashcard loadFlashcard(String[] tokens){
 
-        assert tokens.length == 5: "Token length should be 5";
 
         String frontText = tokens[0].trim();
         String backText = tokens[1].trim();

From fddc13494ec7055cb1119c9e64da9e39f3070b0c Mon Sep 17 00:00:00 2001
From: junhyeong0411 <jazzdosa@kaist.ac.kr>
Date: Fri, 20 Oct 2023 16:08:38 +0900
Subject: [PATCH 02/17] re-add assertions

---
 src/main/java/seedu/duke/calendar/EventStorage.java      | 2 ++
 src/main/java/seedu/duke/flashcard/FlashcardStorage.java | 1 +
 2 files changed, 3 insertions(+)

diff --git a/src/main/java/seedu/duke/calendar/EventStorage.java b/src/main/java/seedu/duke/calendar/EventStorage.java
index 4449e0cbed..1594d1c98a 100644
--- a/src/main/java/seedu/duke/calendar/EventStorage.java
+++ b/src/main/java/seedu/duke/calendar/EventStorage.java
@@ -33,6 +33,8 @@ public boolean isStorageAvailable(){
      */
     private Event loadEvent(String[] tokens){
 
+        assert tokens.length == 3 : "Token length should be 3";
+
         String name = tokens[0].trim();
         LocalDateTime from = LocalDateTime.parse(tokens[1].trim());
         LocalDateTime to = LocalDateTime.parse(tokens[2].trim());
diff --git a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
index a89b91931c..b0ef323267 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
@@ -34,6 +34,7 @@ public boolean isStorageAvailable(){
      */
     private Flashcard loadFlashcard(String[] tokens){
 
+        assert tokens.length == 5 : "Token length should be 5";
 
         String frontText = tokens[0].trim();
         String backText = tokens[1].trim();

From 051176a40e4b50d6fcad9e71c3a2ca8d2022e97a Mon Sep 17 00:00:00 2001
From: junhyeong0411 <jazzdosa@kaist.ac.kr>
Date: Fri, 20 Oct 2023 16:15:44 +0900
Subject: [PATCH 03/17] Adding loggers

---
 .../java/seedu/duke/flashcard/FlashcardStorage.java   | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
index b0ef323267..005cdc296c 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
@@ -6,6 +6,7 @@
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Scanner;
+import java.util.logging.*;
 
 /**
  * storage for flashcards
@@ -18,8 +19,11 @@ public class FlashcardStorage {
 
     public FlashcardStorage(String path){
         this.path = path;
+        flashlogger = Logger.getLogger("flash");
     }
 
+    private static Logger flashlogger; // for logging
+
 
     public boolean isStorageAvailable(){
         File f = new File(this.path);
@@ -36,6 +40,8 @@ private Flashcard loadFlashcard(String[] tokens){
 
         assert tokens.length == 5 : "Token length should be 5";
 
+       //flashlogger.log(Level.INFO, "token length is", tokens.length);
+
         String frontText = tokens[0].trim();
         String backText = tokens[1].trim();
         String[] tags = tokens[2].trim().split("/");
@@ -45,6 +51,8 @@ private Flashcard loadFlashcard(String[] tokens){
 
         Flashcard flashcard = new Flashcard(frontText, backText);
 
+        flashlogger.log(Level.INFO, "added flashcard");
+
         for(String tag:tags){
             if (tag.trim().equals("-")) {
                 break;
@@ -76,6 +84,9 @@ private Flashcard loadFlashcard(String[] tokens){
      * @throws FileNotFoundException
      */
     public FlashcardList loadFlashcards() throws FileNotFoundException{
+
+        flashlogger.log(Level.INFO, "loading flashcard");
+
         FlashcardList flashcardList = new FlashcardList(new ArrayList<>());
         File f = new File (this.path);
         Scanner s = new Scanner(f);

From f2cf4665d4012966ab6c86e09b7076c203994d9b Mon Sep 17 00:00:00 2001
From: junhyeong0411 <jazzdosa@kaist.ac.kr>
Date: Fri, 20 Oct 2023 16:16:34 +0900
Subject: [PATCH 04/17] Logging edited

---
 src/main/java/seedu/duke/flashcard/FlashcardStorage.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
index 005cdc296c..05977885fc 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
@@ -51,7 +51,7 @@ private Flashcard loadFlashcard(String[] tokens){
 
         Flashcard flashcard = new Flashcard(frontText, backText);
 
-        flashlogger.log(Level.INFO, "added flashcard");
+        //flashlogger.log(Level.INFO, "added flashcard");
 
         for(String tag:tags){
             if (tag.trim().equals("-")) {

From fdc7f47d5aa8af3e4ab280ea545cc2838abb49ab Mon Sep 17 00:00:00 2001
From: junhyeong0411 <jazzdosa@kaist.ac.kr>
Date: Fri, 20 Oct 2023 16:23:30 +0900
Subject: [PATCH 05/17] Logging edited 2

---
 src/main/java/seedu/duke/flashcard/FlashcardStorage.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
index 05977885fc..4b56dc2b7d 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
@@ -85,7 +85,7 @@ private Flashcard loadFlashcard(String[] tokens){
      */
     public FlashcardList loadFlashcards() throws FileNotFoundException{
 
-        flashlogger.log(Level.INFO, "loading flashcard");
+        //flashlogger.log(Level.INFO, "loading flashcard");
 
         FlashcardList flashcardList = new FlashcardList(new ArrayList<>());
         File f = new File (this.path);

From afff1d71d9f51c96c736c0f0dbaf440ad6d8f542 Mon Sep 17 00:00:00 2001
From: junhyeong0411 <jazzdosa@kaist.ac.kr>
Date: Fri, 20 Oct 2023 16:30:03 +0900
Subject: [PATCH 06/17] Get back to no-assertion

---
 data/events/event.txt                               |  1 -
 src/main/java/seedu/duke/calendar/EventStorage.java |  2 +-
 .../java/seedu/duke/flashcard/FlashcardStorage.java | 13 +------------
 3 files changed, 2 insertions(+), 14 deletions(-)

diff --git a/data/events/event.txt b/data/events/event.txt
index e78e097630..a66b88d2c9 100644
--- a/data/events/event.txt
+++ b/data/events/event.txt
@@ -1,3 +1,2 @@
 submit v1.0 | 2023-10-29T23:59:59 | 2023-10-30T23:59:59 
 eat dinner | 2023-12-20T19:00 | 2023-12-20T20:00 
-a | 2023-12-12T12:12:12 | 2023-12-12T12:12:13 
diff --git a/src/main/java/seedu/duke/calendar/EventStorage.java b/src/main/java/seedu/duke/calendar/EventStorage.java
index 1594d1c98a..d71325441c 100644
--- a/src/main/java/seedu/duke/calendar/EventStorage.java
+++ b/src/main/java/seedu/duke/calendar/EventStorage.java
@@ -33,7 +33,7 @@ public boolean isStorageAvailable(){
      */
     private Event loadEvent(String[] tokens){
 
-        assert tokens.length == 3 : "Token length should be 3";
+        assert tokens.length == 3: "Token length should be 3";
 
         String name = tokens[0].trim();
         LocalDateTime from = LocalDateTime.parse(tokens[1].trim());
diff --git a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
index 4b56dc2b7d..780b80ba79 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
@@ -6,7 +6,6 @@
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Scanner;
-import java.util.logging.*;
 
 /**
  * storage for flashcards
@@ -19,11 +18,8 @@ public class FlashcardStorage {
 
     public FlashcardStorage(String path){
         this.path = path;
-        flashlogger = Logger.getLogger("flash");
     }
 
-    private static Logger flashlogger; // for logging
-
 
     public boolean isStorageAvailable(){
         File f = new File(this.path);
@@ -38,9 +34,7 @@ public boolean isStorageAvailable(){
      */
     private Flashcard loadFlashcard(String[] tokens){
 
-        assert tokens.length == 5 : "Token length should be 5";
-
-       //flashlogger.log(Level.INFO, "token length is", tokens.length);
+        assert tokens.length == 5: "Token length should be 5";
 
         String frontText = tokens[0].trim();
         String backText = tokens[1].trim();
@@ -51,8 +45,6 @@ private Flashcard loadFlashcard(String[] tokens){
 
         Flashcard flashcard = new Flashcard(frontText, backText);
 
-        //flashlogger.log(Level.INFO, "added flashcard");
-
         for(String tag:tags){
             if (tag.trim().equals("-")) {
                 break;
@@ -84,9 +76,6 @@ private Flashcard loadFlashcard(String[] tokens){
      * @throws FileNotFoundException
      */
     public FlashcardList loadFlashcards() throws FileNotFoundException{
-
-        //flashlogger.log(Level.INFO, "loading flashcard");
-
         FlashcardList flashcardList = new FlashcardList(new ArrayList<>());
         File f = new File (this.path);
         Scanner s = new Scanner(f);

From d0c716e76a8422c7f0a0a7aecd5cbccad1725160 Mon Sep 17 00:00:00 2001
From: junhyeong0411 <jazzdosa@kaist.ac.kr>
Date: Fri, 20 Oct 2023 16:39:29 +0900
Subject: [PATCH 07/17] Logging again

---
 .../java/seedu/duke/flashcard/FlashcardStorage.java  | 12 +++++++++++-
 text-ui-test/ACTUAL.TXT                              |  9 +++++++--
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
index 780b80ba79..bf065c5494 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
@@ -6,6 +6,7 @@
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Scanner;
+import java.util.logging.*;
 
 /**
  * storage for flashcards
@@ -15,9 +16,11 @@ public class FlashcardStorage {
     // simply implemented for save & load first
 
     protected String path;
+    private static Logger flashlogger; // for logging
 
     public FlashcardStorage(String path){
         this.path = path;
+        flashlogger = Logger.getLogger("flash");
     }
 
 
@@ -34,7 +37,9 @@ public boolean isStorageAvailable(){
      */
     private Flashcard loadFlashcard(String[] tokens){
 
-        assert tokens.length == 5: "Token length should be 5";
+        assert tokens.length == 5 : "Token length should be 5";
+
+       //flashlogger.log(Level.INFO, "token length is", tokens.length);
 
         String frontText = tokens[0].trim();
         String backText = tokens[1].trim();
@@ -45,6 +50,8 @@ private Flashcard loadFlashcard(String[] tokens){
 
         Flashcard flashcard = new Flashcard(frontText, backText);
 
+        //flashlogger.log(Level.INFO, "added flashcard");
+
         for(String tag:tags){
             if (tag.trim().equals("-")) {
                 break;
@@ -76,6 +83,9 @@ private Flashcard loadFlashcard(String[] tokens){
      * @throws FileNotFoundException
      */
     public FlashcardList loadFlashcards() throws FileNotFoundException{
+
+        flashlogger.log(Level.INFO, "loading flashcard");
+
         FlashcardList flashcardList = new FlashcardList(new ArrayList<>());
         File f = new File (this.path);
         Scanner s = new Scanner(f);
diff --git a/text-ui-test/ACTUAL.TXT b/text-ui-test/ACTUAL.TXT
index 3cba380ccf..3631e57a32 100644
--- a/text-ui-test/ACTUAL.TXT
+++ b/text-ui-test/ACTUAL.TXT
@@ -1,2 +1,7 @@
-Do you choose flashcard or calendar? 
-Enter your command: 
+    Failed to create directory
+Failed to find files
+Making New file for Flashcards
+    Failed to create directory
+Failed to find files
+Making new file for Events
+    Invalid command! Please try again.

From 93549d43508cbfe510c1554d356baa2e8894aab8 Mon Sep 17 00:00:00 2001
From: Wendelin Wemhoener <wendelin.wemhoener@gmail.com>
Date: Mon, 23 Oct 2023 01:55:21 +0800
Subject: [PATCH 08/17] Explain how to use flashcards in the UG

---
 data/flashcards/flashcard.txt      | 17 +++----
 docs/UserGuide.md                  | 74 +++++++++++++++++++++++++-----
 src/main/java/seedu/duke/Duke.java |  1 -
 3 files changed, 72 insertions(+), 20 deletions(-)

diff --git a/data/flashcards/flashcard.txt b/data/flashcards/flashcard.txt
index e95f8a7c6e..f934b85e8a 100644
--- a/data/flashcards/flashcard.txt
+++ b/data/flashcards/flashcard.txt
@@ -1,8 +1,9 @@
-d | a | - | - | -
-dfdf | dfdf | - | - | -
-dfdf | asdfdf | - | - | -
-ddf | dfdf | - | - | -
-hello | bye | - | - | -
-hello | bye | - | - | -
-end program | hello | - | - | -
-hello | world | - | - | -
+d | a | - | - | -
+dfdf | dfdf | - | - | -
+dfdf | asdfdf | - | - | -
+ddf | dfdf | - | - | -
+hello | bye | - | - | -
+hello | bye | - | - | -
+end program | hello | - | - | -
+hello | world | - | - | -
+dfdf | dfdf | - | - | -
diff --git a/docs/UserGuide.md b/docs/UserGuide.md
index abd9fbe891..2dfe4d9756 100644
--- a/docs/UserGuide.md
+++ b/docs/UserGuide.md
@@ -2,18 +2,27 @@
 
 ## Introduction
 
-{Give a product intro}
+TaskLinker is a CLI-tool for helping students memorize flashcards and track 
+their flashcard and generell academic progress in the courses they are taking.
 
 ## Quick Start
 
-{Give steps to get started quickly}
-
 1. Ensure that you have Java 11 or above installed.
-1. Down the latest version of `Duke` from [here](http://link.to/duke).
+1. Down the latest jar from [the latest release on GitHub]
+   (https://github.com/AY2324S1-CS2113-F11-3/tp/releases).
+1. Run the jar via `java -jar duke.jar`
+
+## General explanation of flashcards
+
+
+
+## Features
+
+### Listing all flashcards: `list flashcards`
 
-## Features 
+Prints out a list of all flashcards.
 
-{Give detailed description of each feature}
+Format: `list flashcards`
 
 ### Adding a todo: `todo`
 Adds a new item to the list of todo items.
@@ -21,14 +30,57 @@ Adds a new item to the list of todo items.
 Format: `todo n/TODO_NAME d/DEADLINE`
 
 * The `DEADLINE` can be in a natural language format.
-* The `TODO_NAME` cannot contain punctuation.  
+* The `TODO_NAME` cannot contain punctuation.
 
-Example of usage: 
+Example of usage:
 
 `todo n/Write the rest of the User Guide d/next week`
 
 `todo n/Refactor the User Guide to remove passive voice d/13/04/2020`
 
+### Creating a new flashcard: `create flashcard`
+
+Starts the process of adding a new flashcard.
+
+After entering this command, you are prompted to first input the front page 
+text (once you have typed it out, submit it by pressing <ENTER>) and then the 
+back page text (once you have typed it out, submit it by pressing <ENTER>) of 
+your new flashcard.
+
+After you've done this, a success message will be printed out. This 
+indicates that a new flashcard has been successfully created and saved.
+
+Format: `create flashcard`
+
+### Reviewing your flashcards: `review flashcards`
+
+Starts the process of reviewing flashcard.
+
+After entering this command, you are prompted to select your exact review 
+mode from 3 choices:
+
+- `random mode`: Randomly selects flashcards to review
+- `spaced repetition mode`: Which flashcards are shown depends on how well 
+  you previously knew them. Flashcards which you couldn't remember well are 
+  shown more often, while flashcards which you remembered well are shown 
+  less often.
+- `review by tag mode`: Randomly selects flashcards with a certain tag to review
+
+Input `a` to choose `random mode`, input `b` to choose `spaced repetition 
+mode` and input `c` to choose `review by tag mode`.
+
+Once you've selected a review mode, the actual review begins: the front page 
+of a flashcard is shown to you. You should now try and think of the answer 
+(the text on the back page of the flashcard); and once you're ready, press 
+<ENTER> to compare it to the actual back page.
+
+Now, the process repeats and the next flashcard is shown to you.
+
+If you want to quit the review process, simply input `q` or `quit` instead 
+of pressing <ENTER> to reveal the back page.
+
+Format: `create flashcard`
+
 ## FAQ
 
 **Q**: How do I transfer my data to another computer? 
@@ -37,6 +89,6 @@ Example of usage:
 
 ## Command Summary
 
-{Give a 'cheat sheet' of commands here}
-
-* Add todo `todo n/TODO_NAME d/DEADLINE`
+* List all flashcards: `list flashcards`
+* Create a new flashcard: `create flashcard`
+* Review your flashcards: `review flashcards`
diff --git a/src/main/java/seedu/duke/Duke.java b/src/main/java/seedu/duke/Duke.java
index 2640517379..e52cfa49bd 100644
--- a/src/main/java/seedu/duke/Duke.java
+++ b/src/main/java/seedu/duke/Duke.java
@@ -28,7 +28,6 @@ private void run() {
 
             if (fc.isResponsible(input)) {
                 fc.processInput(input);
-
             } else if (cm.isResponsible(input)) {
                 cm.processInput(input);
             } else {

From f9406011e0e21093112ae35ffc2741104f66b746 Mon Sep 17 00:00:00 2001
From: Wendelin Wemhoener <wendelin.wemhoener@gmail.com>
Date: Mon, 23 Oct 2023 02:16:41 +0800
Subject: [PATCH 09/17] Implement basic help command

---
 src/main/java/seedu/duke/Duke.java | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/src/main/java/seedu/duke/Duke.java b/src/main/java/seedu/duke/Duke.java
index e52cfa49bd..5f147014f5 100644
--- a/src/main/java/seedu/duke/Duke.java
+++ b/src/main/java/seedu/duke/Duke.java
@@ -30,10 +30,32 @@ private void run() {
                 fc.processInput(input);
             } else if (cm.isResponsible(input)) {
                 cm.processInput(input);
+            } else if (input.startsWith("help")) {
+                printHelp();
             } else {
                 System.out.println("    Invalid command! Please try again.");
             }
         }
 
     }
+
+    private void printHelp() {
+        System.out.println("    If you need help, please consult our " +
+                "user guide at https://ay2324s1-cs2113-f11-3.github" +
+                ".io/tp/UserGuide.html");
+        System.out.println();
+        System.out.println("    Here is a quick overview over all available " +
+                "commands: ");
+
+        String[] commandFormats = new String[] {
+                "list flashcards",
+                "create flashcard",
+                "review flashcards",
+                "help",
+        };
+
+        for (String commandFormat : commandFormats) {
+            System.out.println("    - " + commandFormat);
+        }
+    }
 }
\ No newline at end of file

From ff87f96f03bf474152f7ec95080e3450f6046916 Mon Sep 17 00:00:00 2001
From: Wendelin Wemhoener <wendelin.wemhoener@gmail.com>
Date: Mon, 23 Oct 2023 02:50:30 +0800
Subject: [PATCH 10/17] Allow rating the difficulty of a review

---
 .../java/seedu/duke/flashcard/Flashcard.java  |  4 ++
 .../duke/flashcard/FlashcardComponent.java    |  1 -
 .../flashcard/command/StartReviewCommand.java |  4 +-
 .../flashcard/review/ReviewDifficulty.java    |  5 +--
 .../duke/flashcard/review/ReviewMode.java     | 42 ++++++++++++++++++-
 5 files changed, 49 insertions(+), 7 deletions(-)

diff --git a/src/main/java/seedu/duke/flashcard/Flashcard.java b/src/main/java/seedu/duke/flashcard/Flashcard.java
index 45c72a5666..ea68852d3b 100644
--- a/src/main/java/seedu/duke/flashcard/Flashcard.java
+++ b/src/main/java/seedu/duke/flashcard/Flashcard.java
@@ -44,4 +44,8 @@ public String toString() {
                 + "tags: " + tags.toString() + System.lineSeparator()
                 + "next review due on: " + lastReviewOn + System.lineSeparator();
     }
+
+    public void addReview(FlashcardReview flashcardReview) {
+        reviews.add(flashcardReview);
+    }
 }
diff --git a/src/main/java/seedu/duke/flashcard/FlashcardComponent.java b/src/main/java/seedu/duke/flashcard/FlashcardComponent.java
index 60d0e5d86f..b9422fcb23 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardComponent.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardComponent.java
@@ -12,7 +12,6 @@ public class FlashcardComponent {
     private FlashcardCommandParser parser;
     private FlashcardList flashcardList;
     private FlashcardUi ui;
-
     private FlashcardStorage storage;
 
 
diff --git a/src/main/java/seedu/duke/flashcard/command/StartReviewCommand.java b/src/main/java/seedu/duke/flashcard/command/StartReviewCommand.java
index a024fe9848..d811969c92 100644
--- a/src/main/java/seedu/duke/flashcard/command/StartReviewCommand.java
+++ b/src/main/java/seedu/duke/flashcard/command/StartReviewCommand.java
@@ -28,14 +28,14 @@ private String getUserChoiceReviewMode(Scanner scanner) {
     public void execute(Scanner scanner, FlashcardList flashcardList) {
         String choice = getUserChoiceReviewMode(scanner);
 
-        while (!choices.contains(choice)) {
+        while (!choices.contains(choice.toLowerCase())) {
             System.out.println("    Invalid choice! Your choice must be a, b " +
                     "or c! Please try again.");
 
             choice = getUserChoiceReviewMode(scanner);
         }
 
-        ReviewMode reviewMode = createReviewMode(choice, flashcardList);
+        ReviewMode reviewMode = createReviewMode(choice.toLowerCase(), flashcardList);
 
         if (reviewMode instanceof RandomReviewMode) {
             reviewMode.startReviewSession(scanner);
diff --git a/src/main/java/seedu/duke/flashcard/review/ReviewDifficulty.java b/src/main/java/seedu/duke/flashcard/review/ReviewDifficulty.java
index 36eaa54bbb..ded27fb269 100644
--- a/src/main/java/seedu/duke/flashcard/review/ReviewDifficulty.java
+++ b/src/main/java/seedu/duke/flashcard/review/ReviewDifficulty.java
@@ -4,7 +4,6 @@
 
 public enum ReviewDifficulty {
     EASY,
-    GOOD,
-    HARD,
-    AGAIN
+    MODERATE,
+    HARD
 }
diff --git a/src/main/java/seedu/duke/flashcard/review/ReviewMode.java b/src/main/java/seedu/duke/flashcard/review/ReviewMode.java
index f1cd8ba482..85647c0ae2 100644
--- a/src/main/java/seedu/duke/flashcard/review/ReviewMode.java
+++ b/src/main/java/seedu/duke/flashcard/review/ReviewMode.java
@@ -6,6 +6,8 @@
 import seedu.duke.flashcard.FlashcardList;
 
 import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Scanner;
 
 public abstract class ReviewMode {
@@ -28,7 +30,7 @@ public void startReviewSession(Scanner scanner) {
             printFlashcardFrontTextPrompt(flashcardToReview);
 
             String input = scanner.nextLine();
-            boolean shouldTerminate = input.equals("quit") || input.equals("q");
+            boolean shouldTerminate = input.startsWith("quit") || input.equals("q");
             if (shouldTerminate) {
                 break;
             }
@@ -36,6 +38,8 @@ public void startReviewSession(Scanner scanner) {
             System.out.println("    The actual back text is: " + flashcardToReview.getBackText());
             System.out.println();
 
+            letUserRateReviewDifficulty(scanner, flashcardToReview);
+
             flashcardToReview.setLastReviewOn(LocalDateTime.now());
         }
 
@@ -55,4 +59,40 @@ protected void printFlashcardFrontTextPrompt(Flashcard flashcardToReview) {
                 "compare it, or enter 'q'/'quit' to end this " +
                 "review session]");
     }
+
+    protected void letUserRateReviewDifficulty(Scanner scanner,
+                                               Flashcard flashcard) {
+        System.out.println("    How hard was it to remeber the back page of " +
+                "this flashcard?");
+        System.out.println("    Press <E> if it was easy, <M> if it was " +
+                "moderately challenging or <H> if it was quite hard.");
+
+        final ArrayList<String> choices = new ArrayList<>(Arrays.asList(
+                "e", "m", "h"));
+        String choice = scanner.nextLine();
+
+        while (!choices.contains(choice)) {
+            System.out.println("    Invalid choice! Your choice must be e, m " +
+                    "or h! Please try again.");
+
+            choice = scanner.nextLine();
+        }
+
+        ReviewDifficulty reviewDifficulty;
+        switch (choice.toLowerCase()) {
+        case "e":
+            reviewDifficulty = ReviewDifficulty.EASY;
+            break;
+        case "m":
+            reviewDifficulty = ReviewDifficulty.MODERATE;
+            break;
+        default:
+            reviewDifficulty = ReviewDifficulty.HARD;
+            break;
+        }
+
+        FlashcardReview flashcardReview =
+                new FlashcardReview(LocalDateTime.now(), reviewDifficulty);
+        flashcard.addReview(flashcardReview);
+    }
 }

From bf3d2334c2cf4fe7e7619b10c7ba80621fca8489 Mon Sep 17 00:00:00 2001
From: Wendelin Wemhoener <wendelin.wemhoener@gmail.com>
Date: Mon, 23 Oct 2023 13:45:27 +0800
Subject: [PATCH 11/17] Add ability to delete all flashcards

---
 data/flashcards/flashcard.txt                     | 10 +---------
 docs/UserGuide.md                                 |  2 --
 src/main/java/seedu/duke/flashcard/Flashcard.java | 10 +++++++---
 .../duke/flashcard/FlashcardCommandParser.java    |  3 +++
 .../java/seedu/duke/flashcard/FlashcardList.java  |  5 +++++
 .../command/DeleteAllFlashcardsCommand.java       | 15 +++++++++++++++
 6 files changed, 31 insertions(+), 14 deletions(-)
 create mode 100644 src/main/java/seedu/duke/flashcard/command/DeleteAllFlashcardsCommand.java

diff --git a/data/flashcards/flashcard.txt b/data/flashcards/flashcard.txt
index f934b85e8a..3718354c52 100644
--- a/data/flashcards/flashcard.txt
+++ b/data/flashcards/flashcard.txt
@@ -1,9 +1 @@
-d | a | - | - | -
-dfdf | dfdf | - | - | -
-dfdf | asdfdf | - | - | -
-ddf | dfdf | - | - | -
-hello | bye | - | - | -
-hello | bye | - | - | -
-end program | hello | - | - | -
-hello | world | - | - | -
-dfdf | dfdf | - | - | -
+text | anser | - | - | -
diff --git a/docs/UserGuide.md b/docs/UserGuide.md
index 2dfe4d9756..946cb4f9bf 100644
--- a/docs/UserGuide.md
+++ b/docs/UserGuide.md
@@ -14,8 +14,6 @@ their flashcard and generell academic progress in the courses they are taking.
 
 ## General explanation of flashcards
 
-
-
 ## Features
 
 ### Listing all flashcards: `list flashcards`
diff --git a/src/main/java/seedu/duke/flashcard/Flashcard.java b/src/main/java/seedu/duke/flashcard/Flashcard.java
index ea68852d3b..ccf38cd3a0 100644
--- a/src/main/java/seedu/duke/flashcard/Flashcard.java
+++ b/src/main/java/seedu/duke/flashcard/Flashcard.java
@@ -8,13 +8,13 @@
 import java.util.ArrayList;
 
 public class Flashcard {
+    private static int current_max_id = 1;
     private String frontText;
     private String backText;
     private ArrayList<String> tags;
     private ArrayList<FlashcardReview> reviews;
     private LocalDateTime lastReviewOn;
-
-
+    private int id;
 
     public Flashcard(String frontText, String backText) {
         this.frontText = frontText;
@@ -24,6 +24,9 @@ public Flashcard(String frontText, String backText) {
         reviews = new ArrayList<>();
 
         lastReviewOn = null;
+
+        current_max_id += 1;
+        id = current_max_id;
     }
 
     public void setLastReviewOn(LocalDateTime lastReviewOn) {
@@ -42,7 +45,8 @@ public String toString() {
         return "front text: " + frontText + System.lineSeparator()
                 + "back text: " + backText + System.lineSeparator()
                 + "tags: " + tags.toString() + System.lineSeparator()
-                + "next review due on: " + lastReviewOn + System.lineSeparator();
+                + "next review due on: " + lastReviewOn + System.lineSeparator()
+                + "id: " + id + System.lineSeparator();
     }
 
     public void addReview(FlashcardReview flashcardReview) {
diff --git a/src/main/java/seedu/duke/flashcard/FlashcardCommandParser.java b/src/main/java/seedu/duke/flashcard/FlashcardCommandParser.java
index 3714be31e7..0b5c3b5ffa 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardCommandParser.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardCommandParser.java
@@ -6,6 +6,7 @@
 import seedu.duke.flashcard.command.CreateFlashcardCommand;
 import seedu.duke.flashcard.command.ListFlashcardsCommand;
 import seedu.duke.flashcard.command.StartReviewCommand;
+import seedu.duke.flashcard.command.DeleteAllFlashcardsCommand;
 import seedu.duke.flashcard.command.UnknownCommand;
 
 public class FlashcardCommandParser {
@@ -18,6 +19,8 @@ public FlashcardCommand parseInput(String input) {
             return new ListFlashcardsCommand();
         } else if (input.startsWith("review flashcards")) {
             return new StartReviewCommand();
+        } else if (input.startsWith("delete all flashcards")) {
+            return new DeleteAllFlashcardsCommand();
         }
 
         return new UnknownCommand();
diff --git a/src/main/java/seedu/duke/flashcard/FlashcardList.java b/src/main/java/seedu/duke/flashcard/FlashcardList.java
index cce69c2d36..b2f1a11179 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardList.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardList.java
@@ -21,7 +21,12 @@ public int getSize(){
     }
 
 
+    //@@author wendelinwemhoener
     public void add(Flashcard flashcard) {
         flashcards.add(flashcard);
     }
+
+    public void deleteAllFlashcards() {
+        flashcards.clear();
+    }
 }
diff --git a/src/main/java/seedu/duke/flashcard/command/DeleteAllFlashcardsCommand.java b/src/main/java/seedu/duke/flashcard/command/DeleteAllFlashcardsCommand.java
new file mode 100644
index 0000000000..5084311d6e
--- /dev/null
+++ b/src/main/java/seedu/duke/flashcard/command/DeleteAllFlashcardsCommand.java
@@ -0,0 +1,15 @@
+package seedu.duke.flashcard.command;
+
+import seedu.duke.flashcard.Flashcard;
+import seedu.duke.flashcard.FlashcardList;
+
+import java.util.Scanner;
+
+public class DeleteAllFlashcardsCommand extends FlashcardCommand {
+    public void execute(Scanner scanner, FlashcardList flashcardList) {
+        flashcardList.deleteAllFlashcards();
+
+        System.out.println("    All your flashcards have been successfully " +
+                "deleted .");
+    }
+}

From 4158e2755549c1dc6d5521ca27c4f60303ce9372 Mon Sep 17 00:00:00 2001
From: Wendelin Wemhoener <wendelin.wemhoener@gmail.com>
Date: Wed, 25 Oct 2023 02:10:11 +0800
Subject: [PATCH 12/17] Implement delete single flashcard feature

---
 data/flashcards/flashcard.txt                 |  2 +-
 .../java/seedu/duke/flashcard/Flashcard.java  | 10 ++++--
 .../flashcard/FlashcardCommandParser.java     |  3 ++
 .../seedu/duke/flashcard/FlashcardList.java   | 17 ++++++++++
 .../command/DeleteAllFlashcardsCommand.java   |  1 -
 .../command/DeleteFlashcardCommand.java       | 34 +++++++++++++++++++
 6 files changed, 62 insertions(+), 5 deletions(-)
 create mode 100644 src/main/java/seedu/duke/flashcard/command/DeleteFlashcardCommand.java

diff --git a/data/flashcards/flashcard.txt b/data/flashcards/flashcard.txt
index 3718354c52..978d515f3d 100644
--- a/data/flashcards/flashcard.txt
+++ b/data/flashcards/flashcard.txt
@@ -1 +1 @@
-text | anser | - | - | -
+dd | a | - | - | -
diff --git a/src/main/java/seedu/duke/flashcard/Flashcard.java b/src/main/java/seedu/duke/flashcard/Flashcard.java
index ccf38cd3a0..20c81ff0f8 100644
--- a/src/main/java/seedu/duke/flashcard/Flashcard.java
+++ b/src/main/java/seedu/duke/flashcard/Flashcard.java
@@ -8,7 +8,7 @@
 import java.util.ArrayList;
 
 public class Flashcard {
-    private static int current_max_id = 1;
+    private static int currentMaxId = 1;
     private String frontText;
     private String backText;
     private ArrayList<String> tags;
@@ -25,8 +25,8 @@ public Flashcard(String frontText, String backText) {
 
         lastReviewOn = null;
 
-        current_max_id += 1;
-        id = current_max_id;
+        currentMaxId += 1;
+        id = currentMaxId;
     }
 
     public void setLastReviewOn(LocalDateTime lastReviewOn) {
@@ -37,6 +37,10 @@ public String getFrontText() {
         return frontText;
     }
 
+    public int getId() {
+        return id;
+    }
+
     public String getBackText() {
         return backText;
     }
diff --git a/src/main/java/seedu/duke/flashcard/FlashcardCommandParser.java b/src/main/java/seedu/duke/flashcard/FlashcardCommandParser.java
index 0b5c3b5ffa..c03015926f 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardCommandParser.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardCommandParser.java
@@ -7,6 +7,7 @@
 import seedu.duke.flashcard.command.ListFlashcardsCommand;
 import seedu.duke.flashcard.command.StartReviewCommand;
 import seedu.duke.flashcard.command.DeleteAllFlashcardsCommand;
+import seedu.duke.flashcard.command.DeleteFlashcardCommand;
 import seedu.duke.flashcard.command.UnknownCommand;
 
 public class FlashcardCommandParser {
@@ -21,6 +22,8 @@ public FlashcardCommand parseInput(String input) {
             return new StartReviewCommand();
         } else if (input.startsWith("delete all flashcards")) {
             return new DeleteAllFlashcardsCommand();
+        } else if (input.startsWith("delete flashcard")) {
+            return new DeleteFlashcardCommand();
         }
 
         return new UnknownCommand();
diff --git a/src/main/java/seedu/duke/flashcard/FlashcardList.java b/src/main/java/seedu/duke/flashcard/FlashcardList.java
index b2f1a11179..ce34d3a55d 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardList.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardList.java
@@ -29,4 +29,21 @@ public void add(Flashcard flashcard) {
     public void deleteAllFlashcards() {
         flashcards.clear();
     }
+
+    public boolean deleteFlashcardById(int flashcardId) {
+        int indexToDeleteAt = -1;
+
+        for (int i = 0; i < flashcards.size(); i++) {
+            if (flashcards.get(i).getId() == flashcardId) {
+                indexToDeleteAt = i;
+            }
+        }
+
+        if (indexToDeleteAt == -1) {
+            return false;
+        } else {
+            flashcards.remove(indexToDeleteAt);
+            return true;
+        }
+    }
 }
diff --git a/src/main/java/seedu/duke/flashcard/command/DeleteAllFlashcardsCommand.java b/src/main/java/seedu/duke/flashcard/command/DeleteAllFlashcardsCommand.java
index 5084311d6e..4fb4de3383 100644
--- a/src/main/java/seedu/duke/flashcard/command/DeleteAllFlashcardsCommand.java
+++ b/src/main/java/seedu/duke/flashcard/command/DeleteAllFlashcardsCommand.java
@@ -1,6 +1,5 @@
 package seedu.duke.flashcard.command;
 
-import seedu.duke.flashcard.Flashcard;
 import seedu.duke.flashcard.FlashcardList;
 
 import java.util.Scanner;
diff --git a/src/main/java/seedu/duke/flashcard/command/DeleteFlashcardCommand.java b/src/main/java/seedu/duke/flashcard/command/DeleteFlashcardCommand.java
new file mode 100644
index 0000000000..fee6401058
--- /dev/null
+++ b/src/main/java/seedu/duke/flashcard/command/DeleteFlashcardCommand.java
@@ -0,0 +1,34 @@
+package seedu.duke.flashcard.command;
+
+import seedu.duke.flashcard.FlashcardList;
+
+import java.util.Scanner;
+
+public class DeleteFlashcardCommand extends FlashcardCommand {
+    public void execute(Scanner scanner, FlashcardList flashcardList) {
+        System.out.println("    Enter id of the flashcard you want to delete:" +
+                " ");
+
+        String input = scanner.nextLine();
+        int flashcardId;
+
+        try {
+            flashcardId = Integer.parseInt(input);
+        } catch (NumberFormatException e) {
+            System.out.println("    Invalid input! Id must be an integer");
+            return;
+        }
+
+        boolean deletionWasSuccessful =
+                flashcardList.deleteFlashcardById(flashcardId);
+
+        if (deletionWasSuccessful) {
+            System.out.println("    Flashcard with id " + flashcardId + " has been " +
+                    "successfully deleted.");
+        } else {
+            System.out.println("    Couldn't find a flashcard with id " + flashcardId);
+            System.out.println("    No deletion has been performed. Please " +
+                    "try again with a valid id.");
+        }
+    }
+}
\ No newline at end of file

From c5ad99d1776f8c86699759c29003279c0055898d Mon Sep 17 00:00:00 2001
From: Wendelin Wemhoener <wendelin.wemhoener@gmail.com>
Date: Wed, 25 Oct 2023 02:19:28 +0800
Subject: [PATCH 13/17] Handle empty flashcardlist when listing flashcards

---
 data/flashcards/flashcard.txt                                | 1 -
 src/main/java/seedu/duke/flashcard/FlashcardList.java        | 4 ++++
 .../seedu/duke/flashcard/command/ListFlashcardsCommand.java  | 5 +++++
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/data/flashcards/flashcard.txt b/data/flashcards/flashcard.txt
index 978d515f3d..e69de29bb2 100644
--- a/data/flashcards/flashcard.txt
+++ b/data/flashcards/flashcard.txt
@@ -1 +0,0 @@
-dd | a | - | - | -
diff --git a/src/main/java/seedu/duke/flashcard/FlashcardList.java b/src/main/java/seedu/duke/flashcard/FlashcardList.java
index ce34d3a55d..b4d909c91c 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardList.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardList.java
@@ -30,6 +30,10 @@ public void deleteAllFlashcards() {
         flashcards.clear();
     }
 
+    public boolean isEmpty() {
+        return flashcards.isEmpty();
+    }
+
     public boolean deleteFlashcardById(int flashcardId) {
         int indexToDeleteAt = -1;
 
diff --git a/src/main/java/seedu/duke/flashcard/command/ListFlashcardsCommand.java b/src/main/java/seedu/duke/flashcard/command/ListFlashcardsCommand.java
index d70eba6cac..aa4f35117b 100644
--- a/src/main/java/seedu/duke/flashcard/command/ListFlashcardsCommand.java
+++ b/src/main/java/seedu/duke/flashcard/command/ListFlashcardsCommand.java
@@ -9,6 +9,11 @@
 
 public class ListFlashcardsCommand extends FlashcardCommand {
     public void execute(Scanner scanner, FlashcardList flashcardList) {
+        if (flashcardList.isEmpty()) {
+            System.out.println("    You dont't have any flashcards yet! ");
+            return;
+        }
+
         System.out.println("    Here is a list of all your flashcards: ");
         System.out.println();
 

From a1f94ee9aa703813e0744a97621f4c44bde962ad Mon Sep 17 00:00:00 2001
From: Wendelin Wemhoener <wendelin.wemhoener@gmail.com>
Date: Wed, 25 Oct 2023 02:37:42 +0800
Subject: [PATCH 14/17] Implement calculating global flashcard id

---
 data/flashcards/flashcard.txt                  |  1 +
 .../java/seedu/duke/flashcard/Flashcard.java   | 18 +++++++++++++++---
 .../duke/flashcard/FlashcardComponent.java     |  1 +
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/data/flashcards/flashcard.txt b/data/flashcards/flashcard.txt
index e69de29bb2..791a74256d 100644
--- a/data/flashcards/flashcard.txt
+++ b/data/flashcards/flashcard.txt
@@ -0,0 +1 @@
+dfdf | f | - | - | -
diff --git a/src/main/java/seedu/duke/flashcard/Flashcard.java b/src/main/java/seedu/duke/flashcard/Flashcard.java
index 20c81ff0f8..191690844c 100644
--- a/src/main/java/seedu/duke/flashcard/Flashcard.java
+++ b/src/main/java/seedu/duke/flashcard/Flashcard.java
@@ -8,7 +8,7 @@
 import java.util.ArrayList;
 
 public class Flashcard {
-    private static int currentMaxId = 1;
+    private static int globalMaxId = 1;
     private String frontText;
     private String backText;
     private ArrayList<String> tags;
@@ -25,8 +25,20 @@ public Flashcard(String frontText, String backText) {
 
         lastReviewOn = null;
 
-        currentMaxId += 1;
-        id = currentMaxId;
+        globalMaxId += 1;
+        id = globalMaxId;
+    }
+
+    public static void calculateAndUpdateGlobalMaxId(FlashcardList flashcardList) {
+        int currentMax = 1;
+
+        for (Flashcard flashcard : flashcardList.getFlashcards()){
+            if (flashcard.getId() > currentMax) {
+                currentMax = flashcard.getId();
+            }
+        }
+
+        globalMaxId = currentMax + 1;
     }
 
     public void setLastReviewOn(LocalDateTime lastReviewOn) {
diff --git a/src/main/java/seedu/duke/flashcard/FlashcardComponent.java b/src/main/java/seedu/duke/flashcard/FlashcardComponent.java
index b9422fcb23..004dddbfbd 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardComponent.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardComponent.java
@@ -31,6 +31,7 @@ public FlashcardComponent() {
         }
 
         //@@author wendelinwemhoener
+        Flashcard.calculateAndUpdateGlobalMaxId(flashcardList);
         ui = new FlashcardUi(flashcardList);
     }
 

From 8d899093642a6c22ea743b90b9b980902b7d2677 Mon Sep 17 00:00:00 2001
From: junhyeong0411 <jazzdosa@kaist.ac.kr>
Date: Thu, 26 Oct 2023 04:13:16 +0900
Subject: [PATCH 15/17] Making Java CI test pass

---
 src/main/java/seedu/duke/Duke.java                     | 10 +++++-----
 src/main/java/seedu/duke/calendar/CalendarManager.java |  2 --
 .../java/seedu/duke/flashcard/FlashcardStorage.java    | 10 ++++++----
 .../duke/flashcard/command/DeleteFlashcardCommand.java |  2 +-
 src/test/java/seedu/duke/DukeTest.java                 |  2 --
 5 files changed, 12 insertions(+), 14 deletions(-)

diff --git a/src/main/java/seedu/duke/Duke.java b/src/main/java/seedu/duke/Duke.java
index 5f147014f5..bdb913c923 100644
--- a/src/main/java/seedu/duke/Duke.java
+++ b/src/main/java/seedu/duke/Duke.java
@@ -48,14 +48,14 @@ private void printHelp() {
                 "commands: ");
 
         String[] commandFormats = new String[] {
-                "list flashcards",
-                "create flashcard",
-                "review flashcards",
-                "help",
+            "list flashcards",
+            "create flashcard",
+            "review flashcards",
+            "help",
         };
 
         for (String commandFormat : commandFormats) {
             System.out.println("    - " + commandFormat);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/main/java/seedu/duke/calendar/CalendarManager.java b/src/main/java/seedu/duke/calendar/CalendarManager.java
index 34eaa21ad1..6e1a7db435 100644
--- a/src/main/java/seedu/duke/calendar/CalendarManager.java
+++ b/src/main/java/seedu/duke/calendar/CalendarManager.java
@@ -4,8 +4,6 @@
 
 import seedu.duke.calendar.command.EventCommand;
 import seedu.duke.calendar.command.UnknownCommand;
-import seedu.duke.calendar.Event;
-import seedu.duke.flashcard.FlashcardStorage;
 
 import java.io.FileNotFoundException;
 import java.util.ArrayList;
diff --git a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
index bf065c5494..1d2c1dd8b1 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
@@ -6,7 +6,8 @@
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Scanner;
-import java.util.logging.*;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 /**
  * storage for flashcards
@@ -16,7 +17,7 @@ public class FlashcardStorage {
     // simply implemented for save & load first
 
     protected String path;
-    private static Logger flashlogger; // for logging
+    static private Logger flashlogger; // for logging
 
     public FlashcardStorage(String path){
         this.path = path;
@@ -39,7 +40,7 @@ private Flashcard loadFlashcard(String[] tokens){
 
         assert tokens.length == 5 : "Token length should be 5";
 
-       //flashlogger.log(Level.INFO, "token length is", tokens.length);
+        //flashlogger.log(Level.INFO, "token length is", tokens.length);
 
         String frontText = tokens[0].trim();
         String backText = tokens[1].trim();
@@ -115,7 +116,8 @@ public void saveFlashcards(ArrayList<Flashcard> flashcardList) {
             }
             fw.close();
         } catch (IOException e){
-            System.out.println("Failed to save.");
+            //System.out.println("Failed to save.");
+            flashlogger.log(Level.WARNING, "problem: failed to save");
         }
     }
 
diff --git a/src/main/java/seedu/duke/flashcard/command/DeleteFlashcardCommand.java b/src/main/java/seedu/duke/flashcard/command/DeleteFlashcardCommand.java
index fee6401058..2432f2ce88 100644
--- a/src/main/java/seedu/duke/flashcard/command/DeleteFlashcardCommand.java
+++ b/src/main/java/seedu/duke/flashcard/command/DeleteFlashcardCommand.java
@@ -31,4 +31,4 @@ public void execute(Scanner scanner, FlashcardList flashcardList) {
                     "try again with a valid id.");
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/test/java/seedu/duke/DukeTest.java b/src/test/java/seedu/duke/DukeTest.java
index 3f9f8bf927..2748e0373c 100644
--- a/src/test/java/seedu/duke/DukeTest.java
+++ b/src/test/java/seedu/duke/DukeTest.java
@@ -7,8 +7,6 @@
 import seedu.duke.flashcard.FlashcardComponent;
 import seedu.duke.flashcard.FlashcardStorage;
 
-import java.util.ArrayList;
-
 class DukeTest {
     @Test
     public void sampleTest() {

From 20104be19278321a020c4d81703af96787f0c4d4 Mon Sep 17 00:00:00 2001
From: junhyeong0411 <jazzdosa@kaist.ac.kr>
Date: Thu, 26 Oct 2023 04:16:13 +0900
Subject: [PATCH 16/17] Making Java CI test pass (again)

---
 src/main/java/seedu/duke/flashcard/FlashcardStorage.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
index 1d2c1dd8b1..d74154c3cd 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardStorage.java
@@ -16,8 +16,8 @@
 public class FlashcardStorage {
     // simply implemented for save & load first
 
+    private static Logger flashlogger; // for logging
     protected String path;
-    static private Logger flashlogger; // for logging
 
     public FlashcardStorage(String path){
         this.path = path;

From f9dbd3ebe7f5ced63fa60e2b5853f177bf55d0a2 Mon Sep 17 00:00:00 2001
From: Wendelin Wemhoener <wendelin.wemhoener@gmail.com>
Date: Thu, 26 Oct 2023 13:43:35 +0800
Subject: [PATCH 17/17] Add expert mode for deleting and reviewing

---
 data/flashcards/flashcard.txt                 |  3 +-
 .../java/seedu/duke/flashcard/Flashcard.java  |  3 --
 .../flashcard/FlashcardCommandParser.java     |  4 +-
 .../command/DeleteFlashcardCommand.java       | 30 +++++++++++++-
 .../command/DualFlashcardCommand.java         | 29 +++++++++++++
 .../flashcard/command/StartReviewCommand.java | 41 ++++++++++++++++++-
 6 files changed, 100 insertions(+), 10 deletions(-)
 create mode 100644 src/main/java/seedu/duke/flashcard/command/DualFlashcardCommand.java

diff --git a/data/flashcards/flashcard.txt b/data/flashcards/flashcard.txt
index 791a74256d..e0e9e10c3e 100644
--- a/data/flashcards/flashcard.txt
+++ b/data/flashcards/flashcard.txt
@@ -1 +1,2 @@
-dfdf | f | - | - | -
+ddd | dfdf | - | - | -
+ddff | a | - | - | -
diff --git a/src/main/java/seedu/duke/flashcard/Flashcard.java b/src/main/java/seedu/duke/flashcard/Flashcard.java
index 191690844c..ed620d2a8d 100644
--- a/src/main/java/seedu/duke/flashcard/Flashcard.java
+++ b/src/main/java/seedu/duke/flashcard/Flashcard.java
@@ -11,7 +11,6 @@ public class Flashcard {
     private static int globalMaxId = 1;
     private String frontText;
     private String backText;
-    private ArrayList<String> tags;
     private ArrayList<FlashcardReview> reviews;
     private LocalDateTime lastReviewOn;
     private int id;
@@ -20,7 +19,6 @@ public Flashcard(String frontText, String backText) {
         this.frontText = frontText;
         this.backText = backText;
 
-        tags = new ArrayList<>();
         reviews = new ArrayList<>();
 
         lastReviewOn = null;
@@ -60,7 +58,6 @@ public String getBackText() {
     public String toString() {
         return "front text: " + frontText + System.lineSeparator()
                 + "back text: " + backText + System.lineSeparator()
-                + "tags: " + tags.toString() + System.lineSeparator()
                 + "next review due on: " + lastReviewOn + System.lineSeparator()
                 + "id: " + id + System.lineSeparator();
     }
diff --git a/src/main/java/seedu/duke/flashcard/FlashcardCommandParser.java b/src/main/java/seedu/duke/flashcard/FlashcardCommandParser.java
index c03015926f..e9a7b6f39c 100644
--- a/src/main/java/seedu/duke/flashcard/FlashcardCommandParser.java
+++ b/src/main/java/seedu/duke/flashcard/FlashcardCommandParser.java
@@ -19,11 +19,11 @@ public FlashcardCommand parseInput(String input) {
         } else if (input.startsWith("list flashcards")) {
             return new ListFlashcardsCommand();
         } else if (input.startsWith("review flashcards")) {
-            return new StartReviewCommand();
+            return new StartReviewCommand(input);
         } else if (input.startsWith("delete all flashcards")) {
             return new DeleteAllFlashcardsCommand();
         } else if (input.startsWith("delete flashcard")) {
-            return new DeleteFlashcardCommand();
+            return new DeleteFlashcardCommand(input);
         }
 
         return new UnknownCommand();
diff --git a/src/main/java/seedu/duke/flashcard/command/DeleteFlashcardCommand.java b/src/main/java/seedu/duke/flashcard/command/DeleteFlashcardCommand.java
index 2432f2ce88..6d12b96cb1 100644
--- a/src/main/java/seedu/duke/flashcard/command/DeleteFlashcardCommand.java
+++ b/src/main/java/seedu/duke/flashcard/command/DeleteFlashcardCommand.java
@@ -4,8 +4,18 @@
 
 import java.util.Scanner;
 
-public class DeleteFlashcardCommand extends FlashcardCommand {
-    public void execute(Scanner scanner, FlashcardList flashcardList) {
+public class DeleteFlashcardCommand extends DualFlashcardCommand {
+    private String input = null;
+
+    public DeleteFlashcardCommand(String input) {
+        this.input = input;
+        beginnerCommandLength = 2;
+        expertCommandLength = 3;
+        syntaxString = "delete flashcard FLASHCARD_ID";
+    }
+
+    protected void executeBeginnerMode(Scanner scanner,
+                                    FlashcardList flashcardList) {
         System.out.println("    Enter id of the flashcard you want to delete:" +
                 " ");
 
@@ -19,6 +29,22 @@ public void execute(Scanner scanner, FlashcardList flashcardList) {
             return;
         }
 
+        deleteFlashcardById(flashcardId, flashcardList);
+    }
+
+    protected void executeExpertMode(Scanner scanner,
+                                  FlashcardList flashcardList) {
+        String[] commandParts = input.split(" ");
+
+        try {
+            int flashcardId = Integer.parseInt(commandParts[2]);
+            deleteFlashcardById(flashcardId, flashcardList);
+        } catch (NumberFormatException e) {
+            System.out.println("    Invalid id! Id must be an integer");
+        }
+    }
+
+    private void deleteFlashcardById(int flashcardId, FlashcardList flashcardList) {
         boolean deletionWasSuccessful =
                 flashcardList.deleteFlashcardById(flashcardId);
 
diff --git a/src/main/java/seedu/duke/flashcard/command/DualFlashcardCommand.java b/src/main/java/seedu/duke/flashcard/command/DualFlashcardCommand.java
new file mode 100644
index 0000000000..8d2bb119bd
--- /dev/null
+++ b/src/main/java/seedu/duke/flashcard/command/DualFlashcardCommand.java
@@ -0,0 +1,29 @@
+package seedu.duke.flashcard.command;
+
+import seedu.duke.flashcard.FlashcardList;
+
+import java.util.Scanner;
+
+public abstract class DualFlashcardCommand extends FlashcardCommand {
+    protected int beginnerCommandLength;
+    protected int expertCommandLength;
+    protected String input;
+    protected String syntaxString;
+
+    protected abstract void executeBeginnerMode(Scanner scanner, FlashcardList flashcardList);
+
+    protected abstract void executeExpertMode(Scanner scanner,
+                                         FlashcardList flashcardList);
+
+    public void execute(Scanner scanner, FlashcardList flashcardList) {
+        String[] commandParts = input.split(" ");
+        if (commandParts.length == beginnerCommandLength) {
+            executeBeginnerMode(scanner, flashcardList);
+        } else if (commandParts.length == expertCommandLength) {
+            executeExpertMode(scanner, flashcardList);
+        } else {
+            System.out.println("    Invalid syntax! The syntax is '" + syntaxString + "'");
+            System.out.println("    Please try again.");
+        }
+    }
+}
diff --git a/src/main/java/seedu/duke/flashcard/command/StartReviewCommand.java b/src/main/java/seedu/duke/flashcard/command/StartReviewCommand.java
index d811969c92..3bea59c6aa 100644
--- a/src/main/java/seedu/duke/flashcard/command/StartReviewCommand.java
+++ b/src/main/java/seedu/duke/flashcard/command/StartReviewCommand.java
@@ -12,10 +12,17 @@
 import java.util.Arrays;
 import java.util.Scanner;
 
-public class StartReviewCommand extends FlashcardCommand {
+public class StartReviewCommand extends DualFlashcardCommand {
     private final ArrayList<String> choices = new ArrayList<>(Arrays.asList(
             "a", "b", "c"));
 
+    public StartReviewCommand(String input) {
+        this.input = input;
+        beginnerCommandLength = 2;
+        expertCommandLength = 3;
+        syntaxString = "review flashcards REVIEW_MODE";
+    }
+
     private String getUserChoiceReviewMode(Scanner scanner) {
         System.out.println("    How do you want to review your flashcards?");
         System.out.println("        a) random mode");
@@ -25,7 +32,8 @@ private String getUserChoiceReviewMode(Scanner scanner) {
         return scanner.nextLine();
     }
 
-    public void execute(Scanner scanner, FlashcardList flashcardList) {
+    protected void executeBeginnerMode(Scanner scanner,
+                                     FlashcardList flashcardList) {
         String choice = getUserChoiceReviewMode(scanner);
 
         while (!choices.contains(choice.toLowerCase())) {
@@ -35,6 +43,35 @@ public void execute(Scanner scanner, FlashcardList flashcardList) {
             choice = getUserChoiceReviewMode(scanner);
         }
 
+        startReview(scanner, flashcardList, choice);
+    }
+
+    protected void executeExpertMode(Scanner scanner,
+                                     FlashcardList flashcardList) {
+        String[] commandParts = input.split(" ");
+
+        try {
+            String choice = commandParts[2].toLowerCase();
+
+            if (!choices.contains(choice)) {
+                System.out.println("    Invalid choice! Your choice must be a, b " +
+                        "or c! Please try again.");
+                return;
+            }
+
+            startReview(scanner, flashcardList, choice);
+        } catch (IndexOutOfBoundsException e) {
+            System.out.println("    Invalid syntax! The syntax is 'review " +
+                    "flashcards REVIEW_MODE'");
+            System.out.println("    Please try again.");
+        }
+
+
+    }
+
+    private void startReview(Scanner scanner,
+                             FlashcardList flashcardList,
+                             String choice) {
         ReviewMode reviewMode = createReviewMode(choice.toLowerCase(), flashcardList);
 
         if (reviewMode instanceof RandomReviewMode) {