Resolve "Implement functionality to upload custom text file"

Closes #20 (closed)

src/main/java/edu/ntnu/idatt2003/Controller/MainPageController.java

@@ -2,8 +2,17 @@ package edu.ntnu.idatt2003.controller;
 
 import edu.ntnu.idatt2003.model.ChaosGame;
 import edu.ntnu.idatt2003.model.ChaosGameDescriptionFactory;
+import edu.ntnu.idatt2003.model.ChaosGameFileHandler;
 import edu.ntnu.idatt2003.view.MainPageView;
 
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+import java.util.InputMismatchException;
+
 /**
  * The controller class for the main page of the ChaosGame application.
  * This class is responsible for initializing the game and the view,
@@ -13,6 +22,8 @@ public class MainPageController {
   private final ChaosGame game;
   private final MainPageView view;
 
+  private static final String TRANSFORMATIONS_PATH = "src/main/resources/transformations/";
+
   /**
    * The constructor for the MainPageController class.
    * The constructor initializes the game and the view,
@@ -55,6 +66,51 @@ public class MainPageController {
     game.runSteps(steps);
   }
 
+  /**
+   * Validates the file that is uploaded., and calls storeFile if the
+   * file exists and is formatted correctly.
+   *
+   * @param file The file to upload.
+   * @throws InputMismatchException If the file is not found or the input is invalid.
+   */
+  public void uploadFile(File file) {
+    try {
+      validateFile(file);
+      if (!Files.exists(Path.of(TRANSFORMATIONS_PATH + file.getName()))
+              || view.askConfirmation("File already exists. Do you want to overwrite it?")) {
+        storeFile(file);
+      }
+    } catch (Exception e) {
+      view.showAlert(e.getMessage());
+    }
+  }
+
+  private void validateFile(File file)
+          throws InputMismatchException, FileNotFoundException {
+    try {
+      new ChaosGameFileHandler().readFromFile(file);
+    } catch (InputMismatchException e) {
+      throw new InputMismatchException(e.getMessage());
+    } catch (FileNotFoundException e) {
+      throw new FileNotFoundException(e.getMessage());
+    }
+  }
+
+  /**
+   * Stores the file in the resources/transformations folder of the project.
+   *
+   * @param file The file to store.
+   */
+  private void storeFile(File file) {
+    try {
+      String projectPath = System.getProperty("user.dir");
+      String destinationPath = projectPath + File.separator
+              + TRANSFORMATIONS_PATH + file.getName();
+      Files.copy(file.toPath(), Path.of(destinationPath), StandardCopyOption.REPLACE_EXISTING);
+    } catch (IOException e) {
+      throw new InputMismatchException("Error copying file: " + e.getMessage());
+    }
+  }
   /**
    * Change the transformation-type of the chaos game.
    *