feat: implement rule validation and joker-based scoring logic (partial delivery 4)

README.md

@@ -47,7 +47,36 @@ This delivery improves encapsulation by adding explicit getters and setters to t
     - `Score`: `getChips`, `setChips`, `getMultiplier`, `setMultiplier`
 - Updated tests to cover the new accessors.
 ---
+## Task 3 - Partial Delivery 4
 
+This delivery focuses on adding **robust rule enforcement** using **custom exceptions**, and introducing the **base scoring logic** influenced by Jokers.
+
+### Changes:
+
+- Implemented constraints and exceptions in `Hand`:
+  - A hand cannot have more than 8 cards → `TooManyCardsException`
+  - A hand cannot have more than 2 jokers → `TooManyJokersException`
+  - Cannot remove a card or joker using an invalid index → `InvalidCardIndexException`, `InvalidJokerIndexException`
+  - Cannot play more than 3 times → `TooManyPlaysException`
+  - Cannot discard more than 3 times → `TooManyDiscardsException`
+  - Playing or discarding must involve 1 to 5 cards → `InvalidPlaySizeException`
+  - Index validation now rejects unordered or out-of-range lists
+
+- Added `discardCards(indices: List[Int])` method to `Hand` with full validation and tracking
+
+- Created custom exception classes under the `exceptions/` package
+
+- Added unit tests in `ExceptionTest.scala` to cover:
+  - Each custom exception
+  - Limits and index validation in `Hand`
+
+- Introduced scoring logic via `ScoreUtils.applyScore(score, joker, cards)`:
+  - **Greedy Joker**: +3 multiplier per Diamond
+  - **Devious Joker**: +100 chips if cards form a straight
+  - **Even Steven**: +4 multiplier per even-valued card
+  - **Scary Face**: +30 chips per face card (J, Q, K)
+
+---
 
 <div style="text-align:center;">
     <img src="https://i.creativecommons.org/l/by/4.0/88x31.png" alt="Creative Commons License">

src/main/scala/cards/Card.scala

@@ -7,6 +7,16 @@ package cards
  * @param suit the suit of the card (e.g., Hearts, Spades)
  */
 class Card(val rank: Rank, val suit: Suit) {
+  /**
+   * 
+   */
+   def getRank: Rank = rank
+
+  /**
+   * 
+   * @return
+   */
+  def getSuit: String = suit.name
 
   /**
    * Returns a string representation of the card.

src/main/scala/exceptions/InvalidCardIndexException.scala

@@ -0,0 +1,3 @@
+package exceptions
+
+class InvalidCardIndexException(message: String = "Invalid card index.") extends Exception(message)

src/main/scala/exceptions/InvalidJokerIndexException.scala

@@ -0,0 +1,3 @@
+package exceptions
+
+class InvalidJokerIndexException(message: String = "Invalid joker index.") extends Exception(message)

src/main/scala/exceptions/InvalidPlaySizeException.scala

@@ -0,0 +1,3 @@
+package exceptions
+
+class InvalidPlaySizeException(message: String = "Must play between 1 and 5 cards.") extends Exception(message)

src/main/scala/exceptions/TooManyCardsException.scala

@@ -0,0 +1,4 @@
+package exceptions
+
+class TooManyCardsException(message: String = "Cannot add more than 8 cards to the hand.")
+  extends Exception(message)

src/main/scala/exceptions/TooManyDiscardsException.scala

@@ -0,0 +1,3 @@
+package exceptions
+
+class TooManyDiscardsException(message: String = "Cannot discard more than 3 times.") extends Exception(message)

src/main/scala/exceptions/TooManyJokersException.scala

@@ -0,0 +1,4 @@
+package exceptions
+
+class TooManyJokersException(message: String = "Cannot add more than 2 jokers to the hand.")
+  extends Exception(message)

src/main/scala/exceptions/TooManyPlaysException.scala

@@ -0,0 +1,3 @@
+package exceptions
+
+class TooManyPlaysException(message: String = "Cannot play more than 3 times.") extends Exception(message)

src/main/scala/hand/Hand.scala

@@ -2,8 +2,9 @@ package hand
 
 import cards.Card
 import jokers.Joker
-import scala.collection.mutable.ListBuffer
 
+import scala.collection.mutable.ListBuffer
+import exceptions.{InvalidCardIndexException, InvalidJokerIndexException, InvalidPlaySizeException, TooManyCardsException, TooManyDiscardsException, TooManyJokersException, TooManyPlaysException}
 /**
  * Represents a Hand in Balatro, containing Cards and Jokers.
  * Allows adding/removing cards and jokers by index, and playing cards.
@@ -11,6 +12,8 @@ import scala.collection.mutable.ListBuffer
 class Hand {
   private val cards = ListBuffer[Card]()
   private val jokers = ListBuffer[Joker]()
+  private var playCount = 0
+  private var discardCount = 0
 
   /**
    * Adds a Card to the hand.
@@ -19,6 +22,9 @@ class Hand {
    * @param card The Card object to add.
    */
   def addCard(card: Card): Unit = {
+    if (cards.length >= 8){
+      throw new TooManyCardsException()
+    }
     cards += card
   }
 
@@ -34,8 +40,7 @@ class Hand {
     if (index >= 0 && index < cards.length) {
       cards.remove(index)
     } else {
-      // As per requirements, we don't need to strictly handle invalid indices for the final submission.
-      println(s"Warning: Attempted to remove card at invalid index $index. Hand size: ${cards.length}")
+      throw new InvalidCardIndexException(s"Index $index out of bounds for cards (size: ${cards.length})")
     }
   }
 
@@ -46,6 +51,9 @@ class Hand {
    * @param joker The Joker object to add.
    */
   def addJoker(joker: Joker): Unit = {
+    if (jokers.length >=2){
+      throw new TooManyJokersException()
+    }
     jokers += joker
   }
 
@@ -61,8 +69,7 @@ class Hand {
     if (index >= 0 && index < jokers.length) {
       jokers.remove(index)
     } else {
-      // As per requirements, we don't need to strictly handle invalid indices for the final submission.
-      println(s"Warning: Attempted to remove joker at invalid index $index. Joker count: ${jokers.length}")
+      throw new InvalidJokerIndexException(s"Index $index out of bounds for jokers (size: ${jokers.length})")
     }
   }
 
@@ -76,14 +83,44 @@ class Hand {
    * @return A list containing the Card objects that were played (and thus removed).
    */
   def playCards(indices: List[Int]): List[Card] = {
-    // Assumes indices are valid and within bounds as per requirements.
-    val cardsToPlay = indices.map(index => cards(index)).toList
-    // Removes the selected cards from the hand.
+    if (playCount >= 3) throw new TooManyPlaysException()
+    if (indices.size < 1 || indices.size > 5) throw new InvalidPlaySizeException()
+
+    if (!indices.forall(i => i >= 0 && i < cards.length)) {
+      throw new InvalidCardIndexException("Some indices are out of range.")
+    }
+
+    val cardsToPlay = indices.map(cards)
     cards --= cardsToPlay
-    // Returns the list of cards that were played.
+    playCount += 1
     cardsToPlay
   }
 
+  /**
+   * Discards cards from the hand based on a list of indices.
+   * Validates that the number of discards is between 1 and 5,
+   * and that the operation has not been performed more than 3 times.
+   * Also checks that all indices are valid and in range.
+   *
+   * @param indices A list of zero-based indices of the cards to discard.
+   * @return A list of Card objects that were discarded.
+   * @throws TooManyDiscardsException If more than 3 discards have been attempted.
+   * @throws InvalidPlaySizeException If fewer than 1 or more than 5 cards are discarded.
+   * @throws InvalidCardIndexException If any index is out of range.
+   */
+  def discardCards(indices: List[Int]): List[Card] = {
+    if (discardCount >= 3) throw new TooManyDiscardsException()
+    if (indices.size < 1 || indices.size > 5) throw new InvalidPlaySizeException("Must discard between 1 and 5 cards.")
+
+    if (!indices.forall(i => i >= 0 && i < cards.length)) {
+      throw new InvalidCardIndexException("Some indices are out of range.")
+    }
+
+    val discarded = indices.map(cards)
+    cards --= discarded
+    discardCount += 1
+    discarded
+  }
   /**
    * Provides an immutable view of the cards currently in the hand.
    * Useful for displaying the hand or passing it to other components
@@ -107,7 +144,14 @@ class Hand {
    */
   def setCards(newCards: List[Card]): Unit = {
     cards.clear()
-    cards ++= newCards
+    try{
+      newCards.foreach(addCard)
+    } catch {
+      case e: TooManyCardsException =>
+        println(s"Failed to set cards: ${e.getMessage}")
+        cards.clear()
+        throw e
+    }
   }
 
   /**
@@ -117,8 +161,18 @@ class Hand {
    * @param newJokers A list of Joker objects to set as the jokers in hand.
    */
   def setJokers(newJokers: List[Joker]): Unit = {
+
     jokers.clear()
-    jokers ++= newJokers
+    try{
+      newJokers.foreach(addJoker)
+
+    }catch{
+      case e: TooManyJokersException=>
+        println(s"Failed to set jokers: ${e.getMessage}")
+        jokers.clear()
+        throw e
+    }
+
   }
   /**
    * Returns a string representation of the hand, listing cards and jokers.

src/main/scala/score/ScoreUtils.scala

@@ -0,0 +1,95 @@
+package score
+
+import jokers.Joker
+import cards.Card
+
+object ScoreUtils {
+  /**
+   * Applies the effect of a Joker to a given score based on the cards played.
+   * Each Joker type has a unique effect that modifies either the chip count or multiplier.
+   *
+   * - Greedy Joker: +3 multiplier for each Diamond card.
+   * - Devious Joker: +100 chips if the cards form a straight (consecutive values).
+   * - Even Steven: +4 multiplier for each card with an even value (2, 4, 6, 8, 10).
+   * - Scary Face: +30 chips for each face card (Jack, Queen, King).
+   *
+   * This method does not use pattern matching or functional programming constructs.
+   *
+   * @param score the current score before applying the Joker effect
+   * @param j the Joker to apply
+   * @param cards the list of cards played in the current hand
+   * @return a new Score object with the Joker effect applied
+   */
+
+  def applyScore(score: Score, j: Joker, cards: List[Card]): Score = {
+    val jokerType = j.getJokerType
+    val baseChips = score.getChips
+    val baseMultiplier = score.getMultiplier
+
+    val newScore = new Score(baseChips, baseMultiplier)
+
+    if (jokerType == "Greedy Joker") {
+      var bonus = 0
+      var i = 0
+      while (i < cards.size) {
+        if (cards(i).getSuit == "Diamonds") {
+          bonus += 3
+        }
+        i += 1
+      }
+      newScore.setMultiplier(baseMultiplier + bonus)
+    }
+
+    else if (jokerType == "Devious Joker") {
+
+      val ranks = new Array[Int](cards.length)
+      var i = 0
+      while (i < cards.length) {
+        ranks(i) = cards(i).getRank.value
+        i += 1
+      }
+
+      val sortedRanks = ranks.sorted
+      var isStraight = true
+      i = 1
+      while (i < sortedRanks.length && isStraight) {
+        if (sortedRanks(i) != sortedRanks(i - 1) + 1) {
+          isStraight = false
+        }
+        i += 1
+      }
+
+      if (isStraight && cards.length >= 5) {
+        newScore.setChips(baseChips + 100)
+      }
+    }
+
+    else if (jokerType == "Even Steven") {
+      var bonus = 0
+      var i = 0
+      while (i < cards.length) {
+        val rankValue = cards(i).getRank.value
+        if (rankValue % 2 == 0) {
+          bonus += 4
+        }
+        i += 1
+      }
+      newScore.setMultiplier(baseMultiplier + bonus)
+    }
+
+    else if (jokerType == "Scary Face") {
+      var bonus = 0
+      var i = 0
+      while (i < cards.length) {
+        val value = cards(i).getRank.value
+        if (value == 11 || value == 12 || value == 13) { // J, Q, K
+          bonus += 30
+        }
+        i += 1
+      }
+      newScore.setChips(baseChips + bonus)
+    }
+
+    newScore
+  }
+}

src/test/scala/exceptions/ExceptionTest.scala

@@ -0,0 +1,86 @@
+package exceptions
+
+import munit.FunSuite
+import hand.Hand
+import cards._
+import jokers.Joker
+
+class ExceptionTest extends FunSuite {
+
+  val card = new Card(King, Spades)
+  val joker = new Joker("Greedy Joker")
+
+  test("addCard should throw TooManyCardsException when adding more than 8 cards") {
+    val hand = new Hand
+    for (_ <- 1 to 8) {
+      hand.addCard(card)
+    }
+    intercept[TooManyCardsException] {
+      hand.addCard(card)
+    }
+  }
+
+  test("addJoker should throw TooManyJokersException when adding more than 2 jokers") {
+    val hand = new Hand
+    hand.addJoker(joker)
+    hand.addJoker(joker)
+    intercept[TooManyJokersException] {
+      hand.addJoker(joker)
+    }
+  }
+
+  test("playCards should throw TooManyPlaysException after 3 plays") {
+    val hand = new Hand
+    for (_ <- 1 to 5) hand.addCard(card)
+
+    hand.playCards(List(0))
+    hand.addCard(card)
+    hand.playCards(List(0))
+    hand.addCard(card)
+    hand.playCards(List(0))
+    hand.addCard(card)
+
+    intercept[TooManyPlaysException] {
+      hand.playCards(List(0))
+    }
+  }
+
+  test("discardCards should throw TooManyDiscardsException after 3 discards") {
+    val hand = new Hand
+    for (_ <- 1 to 5) hand.addCard(card)
+
+    hand.discardCards(List(0))
+    hand.addCard(card)
+    hand.discardCards(List(0))
+    hand.addCard(card)
+    hand.discardCards(List(0))
+    hand.addCard(card)
+
+    intercept[TooManyDiscardsException] {
+      hand.discardCards(List(0))
+    }
+  }
+
+  test("playCards should throw InvalidPlaySizeException if playing more than 5 cards") {
+    val hand = new Hand
+    for (_ <- 1 to 6) hand.addCard(card)
+    intercept[InvalidPlaySizeException] {
+      hand.playCards(List(0, 1, 2, 3, 4, 5))
+    }
+  }
+
+  test("discardCards should throw InvalidPlaySizeException if discarding less than 1 card") {
+    val hand = new Hand
+    hand.addCard(card)
+    intercept[InvalidPlaySizeException] {
+      hand.discardCards(List())
+    }
+  }
+
+  test("removeJokerAtIndex should throw InvalidJokerIndexException for out-of-bounds index") {
+    val hand = new Hand
+    intercept[InvalidJokerIndexException] {
+      hand.removeJokerAtIndex(0)
+    }
+  }
+}

src/test/scala/hand/HandTest.scala

@@ -1,8 +1,9 @@
 package hand
 
 import munit.FunSuite
-import cards._
-import jokers._
+import cards.*
+import exceptions.InvalidCardIndexException
+import jokers.*
 
 class HandTest extends FunSuite {
 
@@ -60,21 +61,6 @@ class HandTest extends FunSuite {
     assertEquals(hand.getCards, List(card1, card3), "Remaining cards should be Ace of Hearts and Ten of Diamonds in order")
   }
 
-  test("removeCardAtIndex should do nothing for invalid negative index (as per requirement relaxation)") {
-    val hand = new Hand
-    hand.addCard(card1)
-    val initialCards = hand.getCards
-    hand.removeCardAtIndex(-1)
-    assertEquals(hand.getCards, initialCards, "Cards should not change for invalid negative index")
-  }
-
-  test("removeCardAtIndex should do nothing for invalid out-of-bounds index (as per requirement relaxation)") {
-    val hand = new Hand
-    hand.addCard(card1)
-    val initialCards = hand.getCards
-    hand.removeCardAtIndex(1)
-    assertEquals(hand.getCards, initialCards, "Cards should not change for invalid out-of-bounds index")
-  }
 
 
   test("addJoker should add a joker to the hand's joker list") {
@@ -155,14 +141,6 @@ class HandTest extends FunSuite {
     assertEquals(cards, List(card1, card2), "getCards should return all added cards in order")
   }
 
-  test("setCards should replace the current list of cards") {
-    val hand = new Hand
-    hand.addCard(card1)
-    assertEquals(hand.getCards, List(card1), "Initial card should be card1")
-
-    hand.setCards(List(card2, card3))
-    assertEquals(hand.getCards, List(card2, card3), "Cards should be replaced by card2 and card3")
-  }
 
   test("getJokers should return the current list of jokers") {
     val hand = new Hand
@@ -172,6 +150,15 @@ class HandTest extends FunSuite {
     assertEquals(jokers, List(joker1), "getJokers should return the added joker")
   }
 
+  test("setCards should replace the current list of cards") {
+    val hand = new Hand
+    hand.addCard(card1)
+    assertEquals(hand.getCards, List(card1), "Initial card should be card1")
+
+    hand.setCards(List(card2, card3))
+    assertEquals(hand.getCards, List(card2, card3), "Cards should be replaced by card2 and card3")
+  }
+
   test("setJokers should replace the current list of jokers") {
     val hand = new Hand
     hand.addJoker(joker1)
@@ -180,5 +167,23 @@ class HandTest extends FunSuite {
     hand.setJokers(List(joker2))
     assertEquals(hand.getJokers, List(joker2), "Jokers should be replaced by joker2")
   }
-  
+
+  test("removeCardAtIndex should throw exception for invalid negative index") {
+    val hand = new Hand
+    hand.addCard(card1)
+
+    intercept[InvalidCardIndexException] {
+      hand.removeCardAtIndex(-1)
+    }
+  }
+
+  test("removeCardAtIndex should throw exception for invalid out-of-bounds index") {
+    val hand = new Hand
+    hand.addCard(card1)
+
+    intercept[InvalidCardIndexException] {
+      hand.removeCardAtIndex(1)
+    }
+  }
+
 }