/*
 * 02100 + 02199 Programming
 * Exercise 29: Reading from a file
 * Author: Torben Gjaldbæk, c9718383
 */

import java.util.StringTokenizer;
import java.io.*;

/*
 * The main method of this class reads two lines of integers from the file
 * 'data.txt' (if possible) and stores these in two arrays.
 *
 * The constant 'size' holds the expected length of each line of integers
 * (i.e. 10).
 *
 * If a line contains more than 'size' integers, the rest of the line (beyond the
 * first 'size' integers) is ignored.
 * If a line containts fewer than 'size' integers, an error message is printed.
 * If a line containts non-integer types, the rest of the line is ignored and
 * an error message is printed.
 *
 * Finally, the resulting arrays are printed.
 */
public class IntArrayReader {

	public static void main (String[] args) {

		final int size = 10;

		// allocate result arrays
		int[] array1 = new int[size];
		int[] array2 = new int[size];

   	try {
     	// create input streams
     	FileReader fileReader = new FileReader("data.txt");
     	BufferedReader inFile = new BufferedReader(fileReader);

   		// count the numbers read from line 1 and 2
  		int numbersRead1 = 0;
   		int numbersRead2 = 0;

     	// read first line
     	String line = inFile.readLine();

			if (line == null) {
				System.out.println("ERROR: Line 1 is empty.\n");
			}
     	else {
     		// use a Stringtokenizer to split the line into tokens
     		StringTokenizer tokenizer = new StringTokenizer(line);

        try {
        	for (int i = 0; i < size && tokenizer.hasMoreTokens(); i++) {
         		String token = tokenizer.nextToken();
         		int result = Integer.parseInt(token);
         		array1[i] = result;
         		numbersRead1++;
         	}
        }
        catch (NumberFormatException exception) {
        	// input could not be converted to integers
         	System.out.println("ERROR: Invalid input (line 1):");
          System.out.println(line);
          System.out.println();
        }
        if (numbersRead1 != size) {
        	// could not read enough numbers
        	System.out.println("ERROR: Could not read " + size + " integers from line 1:");
        	System.out.println(line);
        	System.out.println();
        }

        // read second line
        line = inFile.readLine();

       	if (line == null) {
					System.out.println("ERROR: Line 2 is empty.\n");
       	}
       	else {
	 				tokenizer = new StringTokenizer(line);

       		try {
       			for (int i = 0; i < size && tokenizer.hasMoreTokens(); i++) {
       				String token = tokenizer.nextToken();
       				int result = Integer.parseInt(token);
       				array2[i] = result;
       				numbersRead2++;
       			}
       		}
       		catch (NumberFormatException exception) {
         		System.out.println("ERROR: Invalid input (line 2):");
       	  	System.out.println(line);
       	  	System.out.println();
          }
	        if (numbersRead2 != size) {
	        	System.out.println("ERROR: Could not read " + size + " integers from line 2:");
    	      System.out.println(line);
    	      System.out.println();
        	}
        }
			}

			// close input stream
			inFile.close();

			// print array 1
			System.out.println("Array 1:");
			for (int i = 0; i < numbersRead1; i++) {
				System.out.print(array1[i] + " ");
			}
			System.out.println("\n");

			// print array 2
			System.out.println("Array 2:");
			for (int i = 0; i < numbersRead2; i++) {
				System.out.print(array2[i] + " ");
			}
			System.out.println();

		}
   	catch (FileNotFoundException exception) {
   		System.out.println("ERROR: The file 'data.txt' was not found.");
    }
    catch (IOException exception) {
			System.out.println(exception);
    }
	}
}