/**
 * 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 (statement.indexOf("no") >= 0)
		{
				boolean find = getWord(statement, "no");
				if(find) {
					response = "why so negative?";
				}else {
					response = getRandomResponse();
				}

		}
		else if (statement.indexOf("mother") >= 0
				|| statement.indexOf("father") >= 0
				|| statement.indexOf("sister") >= 0)
		{
			response = "Tell me more about your family.";
		}else if(statement.indexOf("cat") >= 0 || statement.indexOf("dog") >= 0) {

			if(statement.indexOf("cat") >= 0 ) {
				boolean find = getWord(statement, "cat");
				if(find) {
					response = "Tell me more about your cat";
				}else {
					response = getRandomResponse();
				}
			} else if(statement.indexOf("dog") >= 0) {
				boolean find = getWord(statement,"dog");
				if(find) {
					response = "Tell me more about your dog";
				} else {
					response = getRandomResponse();
				}
			}

		}
		else if(statement.indexOf("mr. davis") >= 0 || statement.indexOf("mr. memmo") >= 0 || statement.indexOf("mr. crowley") >= 0) {

			response = "He sounds like a pretty nice guy.";

		}
		else if(statement.indexOf("brother") >= 0) {

			response = "Intereseting. What do you think about your brother?";

		}
		else if(statement.indexOf("death") >= 0 || statement.indexOf("dead") >= 0 ) {
			response = "...thats horrible, im very sorry.";
		}
		else if(statement.indexOf("die") >= 0) {
			boolean find = getWord(statement, "die");
			if(find) {
				response = "...That's horrible, I am very sorry. Tell me about your love for taco.";
			} else {
				response = getRandomResponse();
			}
		} else if(statement.indexOf("i want") >= 0) {

			String thing = statement.substring(6);

			char c = thing.charAt(thing.length() - 1);

			if(c > 'z' || c < 'a') {
				thing = thing.substring(0,thing.length() - 1);
			}
				response = "Would you really be happy if you had" + thing + "?";


		} else if(statement.indexOf("i like") >= 0) {
			String thing = statement.substring(6);

			char c = thing.charAt(thing.length() - 1);

			if(c > 'z' || c < 'a') {
				thing = thing.substring(0,thing.length() - 1);
			}
				response = "What do you like about" + thing + "?";
		} else if(statement.indexOf("i") >= 0 && statement.indexOf("you") >= 0) {

			String answer = statement.substring(statement.indexOf("i") + 1,statement.indexOf("you"));
			if(answer.indexOf("think") >= 0) {
				response = "Well, I am simply a program. I do not have any special capabilities \neither as I am just a simple jumble of code.";
			} else {
				response = "Why do you" + answer + "me?";
			}


		}else if(statement.indexOf("you") >= 0 ) {
			response = "Well, I am simply a program. I do not have any special capabilities \neither as I am just a simple jumble of code.";
		}
		else
		{
			response = getRandomResponse();
		}
		return response;
	}

	/**
	 * Pick a default response to use if nothing else fits.
	 * @return a non-committal string
	 */
	// Function gets a random response
	private String getRandomResponse()
	{
		//Produces a random number, to get a random response
		final int NUMBER_OF_RESPONSES = 6;
		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.";
		}
		else if(whichResponse == 4) {
			response = "The mitochondria is the powerhouse of the cell.";
		}
		else if(whichResponse == 5) {
			response = "Lions have teeth just like you and not me because I am not human.";
		}

		return response;
	}

	//Method that returns a boolean that tells the code whether or not the answer actually contains the correct word
	//To produce the correct response from the getResponse method.
	public boolean getWord(String str, String find) {
		//These strings store the characters before and after the word that is trying to be found
		String firstChar = " ";
		String lastChar = " ";


		if(str.indexOf(find) >= 0) {
			if(str.indexOf(find) > 0) {
				firstChar = str.substring(str.indexOf(find) - 1, str.indexOf(find));
			}
			if(str.indexOf(find) + find.length() < str.length() - 1) {
				lastChar = str.substring(str.indexOf(find) + 3, str.indexOf(find) + 4);
			}
		}
		//Checks whether or not both of the characters are spaces. When they are, it proves that the word we are looking for
		//is in the string as an independent word and not as a part of another word.
		if(firstChar.equals(" ") && lastChar.equals(" ") || lastChar.equals("s")) {
			return true;
		} else if(firstChar.equals(" ") && !lastChar.equals(" ") || !lastChar.equals("s")) {
			for(int i = 0; i< find.length(); i++) {

				char c = find.charAt(i);

				if(c > 'z' || c < 'a') {
					return true;
				}
			}
		}

		return false;
	}
}