import java.util.Scanner;
import java.io.*;

/**
 * CS151 Fall 2007 Lab 12 Solution. <BR.
 * Count the number of lines, words, and characters in a specified file.
 * 
 * @author Scott Russell 
 * @version 11/29/2007
 */
public class FileStats
{
    public static void main(String[] args) 
    {
        String filename = new String();
        
        // if you don't explicitly initialize the reader to null you will get a compile error
        FileReader reader = null;
        
        // set up scanner to get user input from terminal window
        Scanner terminal = new Scanner(System.in);

        if (args.length > 0)
            // use supplied argument
            filename = args[0];
        else
        {
            // get filename from user
            System.out.print("Enter name of file to read: ");
            filename = terminal.next();
        }

        // variable to know when the file has been successfully opened and to exit while loop
        boolean fileNameOK = false;

        // try to open file and if unsuccessful keep prompting user for name and
        // tyring to open until successfull        
        while (!fileNameOK)
        {
            try 
            {                
                // try to create a connection/open it
                reader = new FileReader(filename);
                
                // if file opened without error this line is reached and will exit the loop
                fileNameOK = true;
            }
            catch(FileNotFoundException exception)
            {
                System.out.println("Couldn't open file " + filename + ".");
                System.out.print("Enter name of file to read: ");
                // get name of file from the user
                filename = terminal.next();
            }
        }
        

        // attach a scanner to the successfully opened file
        Scanner input = new Scanner(reader);
        
        // declare and initialize line, word, and character counters
        int numLines = 0;
        int numWords = 0;
        int numChars = 0;
        
        // Keep reading ta line of the file incrementing the counts until there are no lines left
        while (input.hasNextLine())
        {
            // a variable store the contents of the current line
            String line = input.nextLine();
            
            numLines++;
            numChars += line.length();
            
            // get number of words by splitting and checking length of resulting array
            numWords += line.split(" ").length;
        }
        
        // Display the final counts
        System.out.println("File " + filename + " contains " + numLines + " lines, " +
            numWords + " words, and " + numChars + " characters.");
            
        // nicely close the Scanner and file being read
        input.close();
    }
}