package com.company;

import java.io.File;
import java.io.FileWriter;
import java.util.ArrayList;
import java.util.Formatter;
import java.util.Scanner;

public class ReadGraph {
    public Graph readOfFile(){
        File fIn = new File("In0205.txt");
        File fInP = new File("In0205P.txt");
        Graph graph = null;

        if(!fIn.exists()){
            try{
                fIn.createNewFile();
            }catch (Exception e){
                System.out.println(e.getMessage());
            }
        }
        if(!fInP.exists()){
            try{
                fInP.createNewFile();
            }catch (Exception e){
                System.out.println(e.getMessage());
            }
        }

        if(fIn.canRead()){
            try{

                Scanner scFIn = new Scanner(fIn);

                int licznik = -1;
                int ilosc = 0;


                while(scFIn.hasNextLine()){
                    Pomocniczy(scFIn.nextLine());

                    Scanner scFInP = new Scanner(fInP);
                    if(licznik == -1){
                        licznik++;
                        ilosc = scFInP.nextInt();
                        graph = new Graph(ilosc);
                    }
                    else{
                        while (scFInP.hasNext()){
                        graph.addEdge(licznik,(scFInP.nextInt()-1));
                        }

                        licznik++;
                    }


                    scFInP.close();
                }

                scFIn.close();
            }catch (Exception e){
                System.out.println(e.getMessage());
            }
        }
        return graph;
    }

    protected void Pomocniczy(String linia){
        try{
            File fInP = new File("In0205P.txt");
            FileWriter fw = new FileWriter(fInP, false);
            Formatter formatter = new Formatter(fw);

            formatter.format("%s",linia);

            formatter.close();  fw.close();
        }catch (Exception e){
            System.out.println(e.getMessage());
        }
    }
}