Merge pull request #130 from Team-40-IDATT2003/enhancemet/124-mulig-å…

…-åpne-save-files-og-det-faktisk-husker-deg

slik

src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/Main.java

@@ -2,10 +2,12 @@
 
 import edu.ntnu.idi.idatt2003.g40.mappe.engine.Exchange;
 import edu.ntnu.idi.idatt2003.g40.mappe.model.Player;
+import edu.ntnu.idi.idatt2003.g40.mappe.model.SaveGame;
 import edu.ntnu.idi.idatt2003.g40.mappe.model.Stock;
-import edu.ntnu.idi.idatt2003.g40.mappe.service.StockFileParser;
-import edu.ntnu.idi.idatt2003.g40.mappe.service.StockFileManager;
+import edu.ntnu.idi.idatt2003.g40.mappe.service.GameStateLoader;
 import edu.ntnu.idi.idatt2003.g40.mappe.service.SaveGameService;
+import edu.ntnu.idi.idatt2003.g40.mappe.service.StockFileManager;
+import edu.ntnu.idi.idatt2003.g40.mappe.service.StockFileParser;
 import edu.ntnu.idi.idatt2003.g40.mappe.service.event.EventManager;
 import edu.ntnu.idi.idatt2003.g40.mappe.utils.ConfigValues;
 import edu.ntnu.idi.idatt2003.g40.mappe.utils.ThemeManager;
@@ -86,14 +88,19 @@ public void start(final Stage stage) throws Exception {
     ViewManager viewManager = new ViewManager(stage, eventManager);
 
     List<Stock> stocksInFile;
-    StockFileManager parser1 = new StockFileManager("src/main/resources/sp500.csv");
+    StockFileManager fileManager = new StockFileManager("src/main/resources/sp500.csv");
 
-    StockFileParser converter1 = new StockFileParser();
-    stocksInFile = converter1.getStocksFromStrings(parser1.readFile());
+    StockFileParser fileParser = new StockFileParser();
+    stocksInFile = fileParser.getStocksFromStrings(fileManager.readFile());
 
     Exchange exchange = new Exchange("Exchange", stocksInFile);
     Player player = new Player("Player 1", new BigDecimal("10000"));
 
+    // Bridges the save list to the live player + exchange. Subscribes
+    // to LOAD_SAVE; mutates state; publishes STATE_RESET for widgets.
+    GameStateLoader gameStateLoader = new GameStateLoader(
+            player, exchange, stocksInFile, eventManager);
+
     // Main menu
     MainMenuView mainMenuView = new MainMenuView();
     new MainMenuController(mainMenuView, eventManager);
@@ -210,6 +217,30 @@ public void start(final Stage stage) throws Exception {
             new InGameSettingsController(inGameSettingsView, eventManager, inGameView);
     topBarController.setSettingsAction(inGameSettingsController::show);
 
+    // Auto-save the currently active save when the player quits back
+    // to the main menu. Silent if no save is active (i.e. the user
+    // got into the in-game scene without going through the save list).
+    topBarController.setOnQuitToMainMenu(() -> {
+      System.out.println("[auto-save] Quit triggered, attempting snapshot...");
+      SaveGame snapshot = gameStateLoader.snapshotActiveSave();
+      if (snapshot == null) {
+        System.out.println("[auto-save] No active save - nothing to write.");
+        return;
+      }
+      System.out.println("[auto-save] Snapshot built for '" + snapshot.getName()
+              + "', balance=" + snapshot.getBalance()
+              + ", week=" + snapshot.getWeek()
+              + ", shares=" + snapshot.getOwnedShares().size()
+              + ", txns=" + snapshot.getTransactions().size());
+      try {
+        saveGameService.saveGame(snapshot);
+        System.out.println("[auto-save] Wrote save '" + snapshot.getName() + "' to disk.");
+      } catch (Exception e) {
+        System.err.println("[auto-save] Failed: " + e.getMessage());
+        e.printStackTrace();
+      }
+    });
+
     // Register all views
     viewManager.addView(mainMenuView);
     viewManager.addView(playGameView);

src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/engine/Exchange.java

@@ -103,6 +103,55 @@ public ReadOnlyIntegerProperty weekProperty() {
     return week.getReadOnlyProperty();
   }
 
+  /**
+   * Sets the current week directly.
+   *
+   * <p>
+   * Used by the save-loading flow when applying a
+   * {@link edu.ntnu.idi.idatt2003.g40.mappe.model.SaveGame} to the
+   * exchange. The {@link IntegerProperty} fires a change event so any
+   * listeners that re-render on week changes refresh themselves.
+   * </p>
+   *
+   * @param newWeek the value to set the week to.
+   *
+   * @throws IllegalArgumentException if newWeek is below 1.
+   * */
+  public void setWeek(final int newWeek) throws IllegalArgumentException {
+    if (newWeek < 1) {
+      throw new IllegalArgumentException("Week must be at least 1!");
+    }
+    week.set(newWeek);
+  }
+
+  /**
+   * Resets every known stock on the exchange back to a baseline sales
+   * price.
+   *
+   * <p>
+   * Wipes the price history of each stock that has a matching entry
+   * in {@code baselinePrices} and re-seeds it with the given value.
+   * Used by the save-loading flow so the exchange the loaded save
+   * sees matches the baseline the save started from, regardless of
+   * how the simulation had drifted before.
+   * </p>
+   *
+   * @param baselinePrices map of symbol to the price to seed with.
+   *                       Symbols that aren't on this exchange are
+   *                       skipped.
+   * */
+  public void resetStocksTo(final Map<String, BigDecimal> baselinePrices) {
+    if (baselinePrices == null) {
+      return;
+    }
+    for (Map.Entry<String, BigDecimal> entry : baselinePrices.entrySet()) {
+      Stock stock = stockMap.get(entry.getKey());
+      if (stock != null) {
+        stock.resetPrices(entry.getValue());
+      }
+    }
+  }
+
   /**
    * Method for checking whether exchange has a stock.
    *

src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/engine/TransactionArchive.java

@@ -43,6 +43,18 @@ public boolean add(final Transaction transaction) {
     return transactions.add(transaction);
   }
 
+  /**
+   * Removes every transaction from the archive.
+   *
+   * <p>Used by the save-loading flow when applying a
+   * {@link edu.ntnu.idi.idatt2003.g40.mappe.model.SaveGame} to an
+   * existing player, to make sure no transactions from the previous
+   * save remain.</p>
+   * */
+  public void clear() {
+    transactions.clear();
+  }
+
   /**
    * Checks whether the archive is empty.
    *

src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/model/OwnedShareData.java

@@ -0,0 +1,81 @@
+package edu.ntnu.idi.idatt2003.g40.mappe.model;
+
+import java.math.BigDecimal;
+
+/**
+ * Immutable data record describing a single owned share in a {@link SaveGame}.
+ *
+ * <p>
+ * Holds just enough information to recreate a {@link Share} when the save is
+ * loaded: the stock symbol, the quantity owned and the original purchase
+ * price. The actual {@link Stock} object is looked up on the live
+ * {@link edu.ntnu.idi.idatt2003.g40.mappe.engine.Exchange} when the save is
+ * applied.
+ * </p>
+ *
+ * <p>
+ * Kept as a separate data type (rather than serialising {@link Share}
+ * directly) so the on-disk format stays decoupled from the runtime model
+ * and is easy to read/write through the hand-written JSON parser in
+ * {@link edu.ntnu.idi.idatt2003.g40.mappe.service.SaveGameService}.
+ * </p>
+ */
+public final class OwnedShareData {
+
+  /** Stock symbol this share is for. */
+  private final String symbol;
+
+  /** Quantity of the stock owned. */
+  private final BigDecimal quantity;
+
+  /** Price per unit at the time of purchase. */
+  private final BigDecimal purchasePrice;
+
+  /**
+   * Constructor.
+   *
+   * @param symbol        the stock symbol.
+   * @param quantity      the quantity owned.
+   * @param purchasePrice the price per unit at purchase time.
+   *
+   * @throws IllegalArgumentException if any argument is null.
+   * */
+  public OwnedShareData(final String symbol,
+                        final BigDecimal quantity,
+                        final BigDecimal purchasePrice)
+          throws IllegalArgumentException {
+    if (symbol == null || quantity == null || purchasePrice == null) {
+      throw new IllegalArgumentException("Invalid owned share data!");
+    }
+    this.symbol = symbol;
+    this.quantity = quantity;
+    this.purchasePrice = purchasePrice;
+  }
+
+  /**
+   * Getter method for the symbol.
+   *
+   * @return the stock symbol.
+   * */
+  public String getSymbol() {
+    return symbol;
+  }
+
+  /**
+   * Getter method for the quantity.
+   *
+   * @return the quantity owned.
+   * */
+  public BigDecimal getQuantity() {
+    return quantity;
+  }
+
+  /**
+   * Getter method for the purchase price.
+   *
+   * @return the price per unit at purchase time.
+   * */
+  public BigDecimal getPurchasePrice() {
+    return purchasePrice;
+  }
+}

src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/model/Player.java

@@ -163,6 +163,40 @@ public void withdrawMoney(final BigDecimal amount)
     updateObservableProperties();
   }
 
+  /**
+   * Replaces the players current balance with the given value.
+   *
+   * <p>
+   * Used by the save-loading flow when applying a {@link SaveGame} to
+   * an existing player. Unlike {@link #addMoney} / {@link #withdrawMoney},
+   * this fully overwrites the current value rather than adjusting it.
+   * </p>
+   *
+   * @param newMoney the value to set the balance to.
+   *
+   * @throws IllegalArgumentException if newMoney is null.
+   * */
+  public void setMoney(final BigDecimal newMoney) throws IllegalArgumentException {
+    if (newMoney == null) {
+      throw new IllegalArgumentException("Money cannot be null!");
+    }
+    money = newMoney;
+  }
+
+  /**
+   * Re-publishes the players current money and net-worth to the
+   * {@link FloatProperty} listeners.
+   *
+   * <p>
+   * Used after the save-loading flow has mutated the player state
+   * (money, portfolio, archive) so listeners across the UI refresh.
+   * </p>
+   * */
+  public void refreshProperties() {
+    networthAsFloatProp.setValue(getNetWorth().floatValue());
+    moneyAsFloatProp.setValue(money);
+  }
+
   /**
    * Returns the players portfolio.
    *

src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/model/Portfolio.java

@@ -114,6 +114,18 @@ public List<Share> getShares() {
     return List.copyOf(shares.values());
   }
 
+  /**
+   * Removes every share from the portfolio.
+   *
+   * <p>Used by the save-loading flow when applying a
+   * {@link edu.ntnu.idi.idatt2003.g40.mappe.model.SaveGame} to an
+   * existing player, to make sure no shares from the previous save
+   * remain.</p>
+   * */
+  public void clear() {
+    shares.clear();
+  }
+
   /**
    * Returns an immutable snapshot of all shares whose
    * stock symbol matches the given symbol.