package interpretacja;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.List;

import wektoryzacja.Graf;

public class WczytanieGrafu {
	public Graf czytaj(File plik) {
		Graf graph = new Graf();
		BufferedReader in = null;
		try {
	        in = new BufferedReader(new FileReader(plik));
	        int n = Integer.parseInt(in.readLine());
	        for (int i = 0; i < n; i++) {
	        	String line = in.readLine();
	        	String[] words = line.split(" ");
	        	int x = Integer.parseInt(words[0]);
	        	int y = Integer.parseInt(words[1]);
	        	int[] node = new int[]{x, y};
	        	graph.dodajWierzcholek(node);
	        }
	        List<int[]> nodes = graph.pobierzWierzcholki();
	        for (int i = 0; i < n; i++) {
	        	String line = in.readLine();
	        	String[] words = line.split(" ");
	        	int[] sourceNode = nodes.get(i);
	        	for (int j = 0; j < words.length; j++) {
	        		int e = Integer.parseInt(words[j]);
	        		int[] destNode = nodes.get(e);
	        		if (sourceNode != destNode) {
	        			graph.dodajKrawedz(sourceNode, destNode);
	        		} else {
	        			System.out.println("Petla w grafie!");
	        		}
	        	}
	        }	        
	        in.close();
	    } catch (IOException ioe) {
	    	if (in != null) {
	    		try { in.close(); } catch (Exception e) {};
	    	}
	    	return null;
	    }
	    return graph;
	}
}