import java.io.BufferedReader;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.Random;

/**
 * Opens dictionary file and reads the lines, putting them into array
 * Removes invalid lines (non alphabetical)
 * Selects a random word, and keeps count of words used
 * 
 * @author: Leon Traill
 * @version: 0.01
 */

public class Dictionary
{
    private Random randomGenerator;
    private ArrayList<String> words;
    
    int wordCount;
    
    // Allow different file names to be used
    public Dictionary(String fileName)
    {
        randomGenerator = new Random();
        words = new ArrayList<String>();
        
        try
        {
            // Open the file
            BufferedReader reader = new BufferedReader(new FileReader(fileName));
            String line = reader.readLine();
            int index = 0;
            
            // Read each line and add into array
            while( line != null )
            {
                words.add(line);
                index++;
                line = reader.readLine();
            }
            
            reader.close();
        }
        catch(Exception e)
        {
            System.out.println(e);
        }
    }
    
    /**
     * Remove lines which contain characters not from the alphabet (A-Z, a-z)
     */
    public void cleanList()
    {
        // Check array, remove all non-letter characters            
        for( int index = 0; index < words.size(); index++ )
        {    
            if( index < words.size() && (!words.get(index).matches("[A-Za-z]+")) )
            {
                words.remove(index);
                // Decrement so the loop does not miss entries when removing
                index--;
            }
        }
    }
    
    /**
     * Accessor for currentWord
     * 
     * @return 
     */
    public String chooseNewWord()
    {
        String currentWord;
        int index = randomGenerator.nextInt(words.size());
        currentWord = words.get(index);
        wordCount++;
        
        return currentWord;
    }
        
}