/* 
A program to perform some basic operations on a list of strings 
using Java streams 
 */

package arraylists;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;


public class StreamArrayListsProcessing {

    public static void main(String[] args){
        //point A: Add some strings which represent names to an ArrayList
        List<String> names = new ArrayList<>();
        names.add("Holiday, Billie");
        names.add("Claudel, Camille");
        names.add("Picasso, Pablo");
        names.add("Gallen-Kallella, Akseli");
        names.add("Zotto, Osvaldo");
        names.add("VanRiper, Daniel");
        names.add("Dendo, Tony");
        names.add("bo-bo, guy");


        //point B
        List<String> firstNamesList = names.stream()
            .map(n -> firstName(n))
            .collect(Collectors.toList());

        System.out.println("First names: ");
        for (String firstName : firstNamesList) {
            System.out.print(firstName + " ");
        }
        System.out.println();
        //point C
        String firstNames = names.stream()
                .map(entireName -> firstName(entireName))
                .collect(Collectors.joining(", "));
        System.out.println("First names: " + firstNames);

        //point D
        String lastNames = names.stream()
                .map(entireName -> lastName(entireName))
                .collect(Collectors.joining(", "));
        System.out.println("Last names: " + lastNames);


        //point E
        String upperCaseFirstNames = names.stream()
                .map(entireName -> firstName(entireName))
                .map(entireName -> entireName.toUpperCase())
                .collect(Collectors.joining(", "));
        System.out.println("Upper Case First Names: " + upperCaseFirstNames);

        //point F
       String hyphenatedLastNames = names.stream()
               .map(Name -> lastName(Name))
               .filter(Name -> Name.contains("-"))
               .collect(Collectors.joining(", "));
       System.out.println("Hyphenated last names : " + hyphenatedLastNames  );

        //point G
        int totalLength = names.stream()
                .map(name -> name.length())
                .reduce(0, (name1, name2) -> name1 + name2);

       System.out.println("Total length: " + totalLength);
        //point H
        int totalLengthFirstNames = names.stream()
                .map(name -> firstName(name))
                .map(name -> name.length())
                .reduce(0, (name, nextName) -> name + nextName);
        System.out.println("Total length of first Names: " + totalLengthFirstNames);


        //point I
        int ProductLength = names.stream()
                .map(name -> name.length())
                .reduce(1, (name1, name2) -> name1 * name2);
        System.out.println("The  product of all the lengths: " + ProductLength);


    }

    private static String firstName(String directoryStyleName) {
        int spaceLocation = directoryStyleName.indexOf(" ");
        String firstName = directoryStyleName.substring(spaceLocation);
        return firstName;
    }

    private static String lastName(String directoryStyleName) {
        int seperatorLocation = directoryStyleName.indexOf(",");
        String lastName =  directoryStyleName.substring(0, seperatorLocation );
        return lastName;
    }

}