/*
 * 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 10 integers from the file
 * 'data.txt' (if possible) and stores these in two arrays.
 *
 * If a line contains more than 10 integers, the rest of the line (beyond the
 * first 10 integers) is ignored.
 * If a line containts fewer than 10 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) {

		// allocate result arrays
		int[] array1 = new int[10];
		int[] array2 = new int[10];

    	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) {


       			// use a Stringtokenizer to split the line into tokens
       			StringTokenizer tokenizer = new StringTokenizer(line);

                try {
            		for (int i = 0; i < 10 && 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 != 10) {
            		// could not read 10 numbers
            		System.out.println("ERROR: Could not read 10 integers from line 1:");
            		System.out.println(line);
            		System.out.println();
            	}

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

         		if (line != null) {

       				tokenizer = new StringTokenizer(line);

            		try {
            			for (int i = 0; i < 10 && 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 != 10) {
	            		System.out.println("ERROR: Could not read 10 integers from line 2:");
    	        		System.out.println(line);
    	        		System.out.println();
        	    	}

            	}
            	else {
            		System.out.println("ERROR: Line 2 is empty.\n");
            	}
			}
			else {
            	System.out.println("ERROR: Line 1 is empty.\n");
			}

			// 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);
    	}
    }
}