import java.util.Random;
import java.util.ArrayList;

/**
 * This illustrates the use of an ArrayList to store a collection of books
 * 
 * @author alchambers
 * @version sp16
 */
public class BookCase{
    private Random rng;
    private ArrayList<String> bookCase;

    /**
     * Creates a new book case to store books
     */
    public BookCase(){
        rng = new Random();
        bookCase = new ArrayList<String>();
    }
    
    /**
     * Adds a book to the book case
     * @param title the title of the book
     */
    public void addBook(String title){
        bookCase.add(title);
    }
    
    /**
     * Checks if a book is contained in the book case
     * @param findBook the title of the book
     * @return true if the book occurs in the book case, false otherwise
     */    
    public boolean containsBook(String findBook){        
        int i = 0;
        while(i < bookCase.size()){
            String bookCheck = bookCase.get(i);
            if(bookCheck.equals(findBook)){
                return true;
            }
            i++;            
        }
        return false;
    }
    
    /**
     * Returns the title of a random book in the book case
     * @return the title of a randomly chosen book
     */
    public String getRandomBook(){
        int size = bookCase.size();
        String title = bookCase.get(rng.nextInt(size));
        return title;
    }
    
    /**
     * Returns a string representation of the state of the bookcase
     * @return a string representing the bookcase
     */
    public String toString(){
        String str = "";
        
        int i = 0;
        while(i < bookCase.size()){
            String title = bookCase.get(i);
            str += title + "\n";  // str = str + title + "\n";
            i++; // i = i + 1;
        }
        
        return str;
    }
}