package arraylists;

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

public class StreamArrayListProcessing {

    public static void main(String[] args){
        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");
        names.add("James, LeBron");
        names.add("Lin, Jason");

        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();

        String firstNames = names.stream()
                .map(n -> firstName(n))
                .collect(Collectors.joining(", "));
        System.out.println("First names: " + firstNames);

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

        String upperCasefirstNames = names.stream()
                .map(n -> firstName(n))
                .map(n -> n.toUpperCase())
                .collect(Collectors.joining(", "));
        System.out.println("Uppercase first names: " + upperCasefirstNames);

        String hyphenatedLastNames = names.stream()
                .map(n -> lastName(n))
                .filter(n -> n.contains("-"))
                .collect(Collectors.joining(", "));
        System.out.println("Last names: " + hyphenatedLastNames);

        int totalLength = names.stream()
                .map(n -> n.length())
                .reduce(0, (n1, n2) -> n1 + n2);
        System.out.println("Total length: " + totalLength);

        int totalLengthOfFirstName = firstNamesList.stream()
                .map(n -> n.length())
                .reduce(0, (n1, n2) -> n1 + n2);
        System.out.println("Total length of first name: " + totalLengthOfFirstName);

        int productLength = names.stream()
                .map(n -> n.length())
                .reduce(1, (n1, n2) -> n1 * n2);
        System.out.println("Product length: " + productLength);
    }

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

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