Spelunky 2 Biome Skin Randomizer

package randomizer;

import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.Scanner;

import javax.imageio.ImageIO;

import org.apache.commons.io.FileUtils;

// Alternate version of the program that moves everything right into the pack folder and deletes the previous mod!
public class RunAndMove {

    // Set filepath
    static String path = "E:\\User\\Documents\\Game Stuff\\Spelunky 2\\Randomizing\\Biome skins";
    static String dest_path = "D:\\Program Files (x86)\\Steam\\steamapps\\common\\Spelunky 2\\Mods\\Packs\\Cool_tilesets";
    static String alreadyUsed = "";
    static String blockedSkins = "";

    public static void main(String[] args) throws IOException {

        // Clean the output folder first
        System.out.println("Cleaning pack folder...\n");
        File directory = new File(dest_path);
        FileUtils.cleanDirectory(directory);

        // Read the list of tilesets
        // Create array
        List<String> skinGroups = new ArrayList<String>();

        //Start the scanner
        File f = new File(path + "\\source_files\\folder_list.txt");
        Scanner s = new Scanner(f);
        System.out.println("Reading folder list...\n");

        //Go through the lines and save them into the array
        while(s.hasNext()) {
            String line = s.nextLine();
            if(!line.substring(0,2).equals("//")){
                skinGroups.add(line);
            }
        }
        s.close();

        // Read the list of globally blocked skins
        //Start the scanner
        File fNew = new File(path + "\\source_files\\blacklist.txt");
        Scanner sNew = new Scanner(fNew);
        System.out.println("Reading blacklist...");

        //Go through the lines and save them into the array
        while(sNew.hasNext()) {
            String lineNew = sNew.nextLine();
            if(!lineNew.substring(0,2).equals("//")){
                blockedSkins = blockedSkins + "," + lineNew + ",";
            }
        }
        sNew.close();
        System.out.println("Skin blacklist:\n" + blockedSkins + "\n");


        // Call the actual function once for each skin pack
        for(int x = 0; x < skinGroups.size(); x++) {
            randomize(skinGroups.get(x));
        }

        System.out.println("\nCompletely done!");

    }

    public static void combineImages(File source, File dest) throws IOException {
        // Load source images
        BufferedImage base = ImageIO.read(dest);
        BufferedImage overlay = ImageIO.read(source);

        // Create the new image, canvas size is the max. of both image sizes
        int w = Math.max(base.getWidth(), overlay.getWidth());
        int h = Math.max(base.getHeight(), overlay.getHeight());
        BufferedImage combined = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);

        // Paint both images, preserving the alpha channels
        Graphics g = combined.getGraphics();
        g.drawImage(base, 0, 0, null);
        g.drawImage(overlay, 0, 0, null);
        g.dispose();

        // Overwrite the first image (used in output)
        ImageIO.write(combined, "PNG", dest);
    }

    // Function that basically does everything
    public static void randomize(String biomeName) throws IOException {

        // Create skins array
        List<String> skinList = new ArrayList<String>();

        //Start the scanner with our specified folder path from the main
        File f2 = new File(path + "\\source_files\\" + biomeName + "_skins\\skin_list.txt");
        Scanner s2 = new Scanner(f2);

        //Go through the lines and save them into the array unless they are commented out or have already been used or are on the blocklist
        while(s2.hasNext()) {
            String line2 = s2.nextLine();
            if(!line2.substring(0,2).equals("//") && !alreadyUsed.contains("," + line2 + ",") && !blockedSkins.contains("," + line2 + ",")){
                skinList.add(line2);
            }
        }
        s2.close();
        System.out.println("\n" + biomeName + " skin list:\n" + skinList);


        // Create file names array
        List<String> targetFiles = new ArrayList<String>();

        //Start the scanner with our specified folder path from the main
        File f3 = new File(path + "\\source_files\\" + biomeName + "_skins\\target_filenames.txt");
        Scanner s3 = new Scanner(f3);

        //Go through the lines and save them into the array unless they are commented out
        while(s3.hasNext()) {
            String line3 = s3.nextLine();
            if(!line3.substring(0,2).equals("//")){
                targetFiles.add(line3);
            }
        }
        s3.close();


        // Pick random skin from the first array
        Random random = new Random();
        String chosenSkin = skinList.get(random.nextInt(skinList.size()));

        // Save the chosen skin to the list of already used ones
        alreadyUsed = alreadyUsed + "," + chosenSkin + ",";

        // Copy the correct files to the output folder
        System.out.println("Copying " + biomeName + " files...");
        for(int i = 0; i < targetFiles.size(); i++) {
            // If the filename needs to be exact then do it differently!
            if(targetFiles.get(i).contains("exact=")) {
                // Modify the filename first
                File source = new File(path + "\\source_files\\" + biomeName + "_skins\\" + chosenSkin + "\\" + targetFiles.get(i).substring(6) + ".png");
                File dest = new File(dest_path + "\\" + targetFiles.get(i).substring(6) + ".png");

                // If the destination file already exists then combine it with the new one
                if(dest.isFile()) {
                    combineImages(source, dest);
                } else {
                    FileUtils.copyFile(source, dest);
                }

            } else {
                File source = new File(path + "\\source_files\\" + biomeName + "_skins\\" + chosenSkin + "\\" + targetFiles.get(i) + chosenSkin + ".png");
                File dest = new File(dest_path + "\\" + targetFiles.get(i) + biomeName + ".png");

                // If the destination file already exists, combine it with the new one
                if(dest.isFile()) {
                    combineImages(source, dest);
                } else {
                    FileUtils.copyFile(source, dest);
                }
            }

        }

    }

}