import java.util.*;
/**
 * Created by dan on 6/14/17.
 */
public class StringUtilities {
    /**
     * @return `Hello World` as a string
     */
    public String getHelloWorld() {
        return "Hello World";
    }

    /**
     * @param firstSegment a string to be added to
     * @param secondSegment a string to add
     * @return the concatenation of two strings, `firstSegment`, and `secondSegment`
     */
    public String concatenation(String firstSegment, String secondSegment){
        return (firstSegment + secondSegment);
    }

    /**
     * @param firstSegment a string to be added to
     * @param secondSegment a string to add
     * @return the concatenation of an integer, `firstSegment`, and a String, `secondSegment`
     */
    public String concatenation(int firstSegment, String secondSegment){
        return (firstSegment + secondSegment);
    }

    /**
     * @param input a string to be manipulated
     * @return the first 3 characters of `input`
     */
    public String getPrefix(String input){
        return (input.substring(0,3));
    }

    /**
     * @param input a string to be manipulated
     * @return the last 3 characters of `input`
     */
    public String getSuffix(String input){
        return (input.substring(input.length()-3));
    }

    /**
     * @param inputValue the value to be compared
     * @param comparableValue the value to be compared against
     * @return the equivalence of two strings, `inputValue` and `comparableValue`
     */
    public Boolean compareTwoStrings(String inputValue, String comparableValue){
        return inputValue.equals(comparableValue);
    }

    /**
     * @param inputValue the value input from user
     * @return the middle character of `inputValue`
     */
    public Character getMiddleCharacter(String inputValue){
        if ((inputValue.length() % 2) == 1 ){
            return inputValue.charAt(inputValue.length()/2);
        }else{
            return inputValue.charAt((inputValue.length()-1)/2);
        }
    }   

    /**
     * @param spaceDelimitedString a string, representative of a sentence, containing spaces
     * @return the first sequence of characters
     */
    public String getFirstWord(String spaceDelimitedString){
        //indexOf searches for the first instance of something
        int firstSpace = spaceDelimitedString.indexOf(" ");
        return spaceDelimitedString.substring(0,firstSpace);
    }

    /**
     * @param spaceDelimitedString a string delimited by spaces
     * @return the second word of a string delimited by spaces.
     */
    public String getSecondWord(String spaceDelimitedString){
        //scanner.next searches for the next word
        Scanner scanner = new Scanner(spaceDelimitedString);
        scanner.next();
        return scanner.next();
    }

    /**
     * @param stringToReverse
     * @return an identical string with characters in reverse order.
     */
    public String reverse(String stringToReverse){
        String newString = "";
        for (int x = stringToReverse.length()-1; x >= 0; x--){
            newString += stringToReverse.charAt(x);
        }
        return newString;
    }

    /**
     * @param input
     * @return an identical string with spaces removed.
     */
    public String removeWhitespace(String input){
        return input.replace(" ","");
    }

    /**
     * @param input
     * @return an identical string with spaces in the front and end removed.
     */
    public String trim(String input){
        return input.trim();
    }
}