import lombok.val;
import org.apache.commons.io.FileUtils;


import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class RandomGenerator {

    List createRandomGaussianSequence(int number){
        var list = new ArrayList<>();
        var random = new Random();

        for(var i =0; i < number ; i++){

            list.add(random.nextDouble());
        }


    return list;
    }


    void createFile(String filename,String folder, List<Double> list){

        try {
            FileWriter myWriter = new FileWriter("./"+folder+"/"+filename+".csv");
            String values = "";
            for(Double data: list) {
               values+= data +",";
            }
            //delete last comma
            values = values.replaceAll(", $", "\n");
            myWriter.write(values);
            myWriter.close();

        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }

    void createDirectories(String featureDir, String targetDir) {


        File feature = new File(featureDir);
        File target = new File(targetDir);

        boolean isFeatureDirectoryCreated = feature.mkdir();

        if (isFeatureDirectoryCreated) {
            System.out.println("successfully made");

        } else {
            deleteDir(feature);  // Invoke recursive method
            feature.mkdir();
        }

        boolean isTargetDirectoryCreated = target.mkdir();

        if (isTargetDirectoryCreated) {
            System.out.println("successfully made");

        } else {
            deleteDir(target);  // Invoke recursive method
            feature.mkdir();
        }


    }




    public void deleteDir(File dir) {
        File[] files = dir.listFiles();

        for (File myFile: files) {
            if (myFile.isDirectory()) {
                deleteDir(myFile);
            }
            myFile.delete();

        }
    }


    void createCSV(String featureFolder, String targetFolder, int numberOfFiles, int sizeOfSequence){


     createDirectories(featureFolder, targetFolder);
        for(Integer i=0; i <= numberOfFiles; i++){

            var list = createRandomGaussianSequence(sizeOfSequence);


            //Save Features
            createFile(i.toString(),featureFolder,list.subList(0,list.size()-2));
            //Save Target
            createFile(i.toString(),targetFolder,list.subList(list.size()-2,list.size()-1));




        }




    }

}