/* 
 * 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 StreamArrayListProcessing {

    public static void main(String[] args) {
        //Point A
        List<String> names = new ArrayList<>();
        names.add("Holiday, Billie");
        names.add("Claudel, Camille");
        names.add("Picasso, Pablo");
        names.add("Gallen-Kallela, Akseli");
        names.add("Zotto, Osvaldo");

        //Point B
        List<String> firstNamesList = names.stream()
                .map(n -> firstName(n))
                .collect(Collectors.toList());
        System.out.print("First names: ");
        for (String firstName : firstNamesList) {
            System.out.print(firstName + " ");
        }
        System.out.println();

        //Point C
        String firstNames = names.stream()
                .map(n -> firstName(n))
                .collect(Collectors.joining(", "));

        System.out.println("First names: " + firstNames);

        //Point D
        String lastNames = names.stream()
                .map(n -> lastName(n))
                .collect(Collectors.joining(", "));

        System.out.println("Last names: " + lastNames);

        //Point E
        String upperCaseFirstNames = names.stream()
                .map(n -> firstName(n))
                .map(n -> n.toUpperCase())
                .collect(Collectors.joining(", "));

        System.out.println("Uppercase first names: " + upperCaseFirstNames);

        //Point F
        String hyphenatedLastNames = names.stream()
                .map(n -> lastName(n))
                .filter(n -> n.contains("-"))
                .collect(Collectors.joining(", "));

        System.out.println("Hyphenated last names: " + hyphenatedLastNames);

        //Point G
        int totalLength = names.stream()
                .map(n -> n.length())
                .reduce(0, (n1, n2) -> n1 + n2);

        System.out.println("Total length: " + totalLength);

        //Point H
        int firstLength = names.stream()
                .map(n -> firstName(n).length())
                .reduce(0, (n1, n2) -> n1 + n2);

        System.out.println("First names length: " + firstLength);

        //Point I
        int lastLength = names.stream()
                .map(n -> lastName(n).length())
                .reduce(0, (n1, n2) -> n1 + n2);

        System.out.println("Last names length: " + lastLength);
    }

    private static String firstName(String directoryStyleName) {
        return directoryStyleName.substring(directoryStyleName.indexOf(",") + 2, directoryStyleName.length());
    }

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