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

/**
 * This illustrates the use of an ArrayList to store a collection of books
 * @author alchambers
 */
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){  
        boolean found = false;
        int counter = 0;

        // In this case, a while loop is a better choice than a for loop
        // becauses we want to iterate WHILE found == false. In other words,
        // we want to iterate WHILE some state is true. You could turn this
        // into a for loop, but it will look a bit messier

        while(found == false && counter < bookCase.size()){
            // Get the title of the book at that position in the list
            String bookTitle = bookCase.get(counter);

            // If findBook equals the title of the book
            if(findBook.equals(bookTitle)){
                found = true;
            }
            // Not the book we were looking for
            else{
                found = false;
            }
            counter++;            
        }
        return found;
    }

    /**
     * Returns the title of a random book in the book case
     * @return the title of a randomly chosen book
     */
    public String getRandomBook(){
        // Get the size of the list
        int size = bookCase.size();

        // Generate a random int between [0, size-1]
        int rand = rng.nextInt(size);

        // Get the title of the book at that random position
        return bookCase.get(rand);
    }

    /**
     * Returns a string representation of the state of the bookcase
     * @return a string representing the bookcase
     */
    public String toString(){

        // In this case, a for loop is the better choice because we want to
        // iterate over each String in the ArrayList. In other words, for 
        // bookCase.size() iterations we want to perform some action
        String str = "The bookcase contains " + bookCase.size() + " books:\n";
        for(int i = 0; i < bookCase.size(); i++){
            String bookTitle = bookCase.get(i);
            str += bookTitle + "\n";
        }
        return str;
    }
}