package Front_desk;

import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.util.*;

public class FileSys {
    String Filename; //String to hold Filename for txt file

    File f = new File(Filename); //file object for file operations

    List<String> file = new ArrayList<>(); // Arraylist to load file elements into list

    PrintWriter pw = null; //initialization of printWriter obeject.


    //Method to write to file.

    void FWrite(String element) {
        try {
            FileWriter FWriter = new FileWriter(Filename, true);
            pw = new PrintWriter(FWriter);
            pw.println(element);
            pw.close();
        }

        catch(Exception e) {
            System.out.println("error Write");
        }
    }

    //Method to Load file into list.

    void Freader() {
        try {

            Scanner Fread = new Scanner(f);

            while(Fread.hasNext()) {
                file.add(Fread.next());
            }
            Fread.close();
        }
        catch (Exception e) {
            System.out.println("error read");
        }
    }

    //Method to print list elements

    void arrListPrint() {
        for (String element : file) {
            System.out.println("element = " + element);
        }
    }

    //Method to search for elements in the list

    void SearchFile (String ElementToSearch) {
        for (int i=0; i<file.size(); i++) {
            if (file.get(i) == ElementToSearch) {
                System.out.println("file found :" + file.get(i));
            }
        }
    }

    //Method to write back to the file

    void ListToFile() {

        try {
            FileWriter FWriter = new FileWriter(Filename, false);
            pw = new PrintWriter(FWriter);

            for (String element : file) {
                pw.println("New: " + element);
            }

            pw.close();
        }
        catch(Exception e) {
            System.out.println("error Write");
        }
    }

    //Method to replace File objects with "empty"

    void MakeEmpty (String ElementToReplace) {

        for (int i=0; i<file.size(); i++) {
            if (file.get(i) == ElementToReplace) {
                file.set(i, "empty");
            }
        }

    }

    //Method to replace File objects

    void ReplaceFile (String ElementToReplace, String ElementToReplaceWith) {

        for (int i=0; i<file.size(); i++) {
            if (file.get(i) == ElementToReplace) {
                file.set(i, ElementToReplaceWith);
            }
        }

    }

}