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: 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-Kallela, Akseli");
        names.add("Zotto, Osvaldo");
        names.add("Urman, Michelle");


        // Point B: Use map and the toList collector to create an ArrayList of just the first names of the names
        //          ArrayList. Use a for loop to print out the names, separated by spaces.
        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: Use map and the joining collector to create a String of just the first names of the names ArrayList
        //          with each name separates by a comma. Print it.
        String firstNames = names.stream()
                .map(n -> firstName(n))
                .collect(Collectors.joining(", "));

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

        // Point D: By analogy from point C, print a comma-separated list of the last names
        //          in the names ArrayList.
        String lastNames = names.stream()
                .map(n -> lastName(n))
                .collect(Collectors.joining(", "));

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


        // Point E: Print a comma-separated list of all uppercase first names from the list of names
        //          in the names ArrayList.
        String upperCaseFirstNames = names.stream()
                .map(n -> firstName(n))
                .map(n -> n.toUpperCase())
                .collect(Collectors.joining(", "));

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


        // Point F: Print a comma-separated list of all hyphenated last names from the list of names in the
        //          names ArrayList.
        String hyphenatedLastNames = names.stream()
                .map(n -> lastName(n))
                .filter(n -> n.contains("-"))
                .collect(Collectors.joining(", "));

        System.out.println("Hyphenated last names: " + hyphenatedLastNames);
        // Point G: Print the integer value of the total length of all names in the names ArrayList.
        int totalLength = names.stream()
                .map(n -> n.length())
                .reduce(0, (n1,n2) -> n1+n2);

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


        // Point H: Print the integer value of the total length of all first names in the names ArrayList.
        int firstlength = firstNamesList.stream()
                .map(n -> n.length())
                .reduce(0, (n1,n2) -> n1+n2);

        System.out.println("First name length: " + firstlength);


        // Point I: Print the integer value of the product of the length of all the first names
        //          in the names ArrayList.

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

        System.out.println("Product of the first names: " + product);

    }


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

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