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

package arraylistplay;

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");

        // 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.println("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 separated
        // 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 firstNameLength = names.stream()
                .map(n -> firstName(n))
                .map(n -> n.length())
                .reduce(0,(n1, n2) -> n1 + n2);

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

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

//        int namesLength = names.stream()
//                .map(n -> names.size())
//                .limit()



    }

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

        return directoryStyleName;
    }

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