/**
 * A program to carry on conversations with a human user.
 * This is the initial version that:
 * <ul><li>
 *       Uses indexOf to find strings
 * </li><li>
 *          Handles responding to simple words and phrases
 * </li></ul>
 * This version uses a nested if to handle default responses.
 * @author Laurie White
 * @version April 2012
 */
public class Magpie2
{
    /**
     * Get a default greeting
     * @return a greeting
     */
    public String getGreeting()
    {
        return "Hello, let's talk.";
    }

    /**
     * Gives a response to a user statement
     *
     * @param statement
     *            the user statement
     * @return a response based on the rules given
     */
    public String getResponse(String statement)
    {
        String response = "";
        String trimStatement = statement.trim();
        if (statement.indexOf("no") >= 0)
        {
            response = "Why so negative?";
        }
        else if (statement.indexOf("mother") >= 0
                || statement.indexOf("father") >= 0
                || statement.indexOf("sister") >= 0
                || statement.indexOf("brother") >= 0)
        {
            response = "Tell me more about your family.";
        }
        else if (statement.indexOf("Dog") >= 0
                || statement.indexOf("dog") >= 0
                || statement.indexOf("Cat") >= 0
                || statement.indexOf("cat") >= 0)
        {
            response = "Tell me more about your pets.";
        }
        else if (statement.indexOf("Mr.") >= 0
                || statement.indexOf("mr.") >= 0)
        {
            response = "He sounds like a good teacher.";
        }
        else if (trimStatement.length() == 0)
        {
			response = "Please say something";
        }
        else
        {
            response = getRandomResponse();
        }
        return response;
    }

	/**
	 * Pick a default response to use if nothing else fits.
	 * @return a non-committal string
	 */
	private String getRandomResponse()
	{
		final int NUMBER_OF_RESPONSES = 4;
		double r = Math.random();
		int whichResponse = (int)(r * NUMBER_OF_RESPONSES);
		String response = "";

		if (whichResponse == 0)
		{
			response = "Interesting, tell me more.";
		}
		else if (whichResponse == 1)
		{
			response = "Hmmm.";
		}
		else if (whichResponse == 2)
		{
			response = "Do you really think so?";
		}
		else if (whichResponse == 3)
		{
			response = "You don't say.";
		}

		return response;
	}
}