/*
 * 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 = "";

        statement=statement.toLowerCase();

        if (isAlone(statement, "no"))
            response = "Why so negative?";

        else if (isAlone(statement, "i want to")){
            String str="i want to";
            int index=statement.indexOf(str);
            int length=statement.length();
            int eIndex=index+str.length()-1;
            String rest=statement.substring(eIndex+1,length);
            response="what would it mean to you to"+rest;
        }

        //extra feature
        else if (isAlone(statement, "i don't like")){
            String str="i want to";
            int index=statement.indexOf(str);
            int length=statement.length();
            int eIndex=index+str.length()-1;
            String rest=statement.substring(eIndex+1,length);
            response="why don't you like"+rest;
        }

        else if (isAlone(statement, "mother")
        || isAlone(statement, "father")
        || isAlone(statement, "brother")
        || isAlone(statement, "sister"))
            response = "Tell me more about your family.";

        else if (isAlone(statement, "dog")|| isAlone(statement, "cat"))
            response = "Tell me more about your pets.";

        else if (isAlone(statement, "memmo"))
            response = "He seems like a good teacher.";

        else if (isAlone(statement, "math"))
            response = "Do you enjoy doing math?";

        else if (isAlone(statement, "school"))
            response = "School is great for learning.";

        else if (isAlone(statement, "mad"))
            response = "Maybe you should take a walk.";

        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;
    }

    public static boolean isAlone (String in, String str){
        int index=in.indexOf(str);
        int length=in.length();
        int eIndex=index+str.length()-1;

        //input equals keyword
        if(in.indexOf(str)>=0){

            if (in.equals(str))
                return true;

            //space,end of string
            else if(eIndex+1==length && in.substring(index-1,index).equals(" "))
                return true;

            //space,space/puntuation
            else if (index==0 || in.substring(index-1,index).equals(" ")){
                if (in.substring(eIndex+1,eIndex+2).equals(" ")
                || in.substring(eIndex+1,eIndex+2).equals(".")
                || in.substring(eIndex+1,eIndex+2).equals("?")
                || in.substring(eIndex+1,eIndex+2).equals("!"))
                    return true;

                else return false;
            }
            return false;
        }
        return false;
    }
}