/* 
a program to perform some basic operations on a list of Strings using Java streams. 
*/

package arraylist;

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("Ibanez, Diego");
        names.add("Bonilla, Walter");
        names.add("Gayguy, Christopher");

        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("Hyphenated last names: " + hyphenatedLastNames);

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

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

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

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

        int namesProduct = names.stream()
                .map(n -> n.length())
                .reduce(1, (n1, n2) -> n1 * n2);

        System.out.println("Names product: " + namesProduct);
    }

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

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