/* 
 * 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 StreamArrayListsProcessng {

    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, Camllie");
        names.add("Picasso, Pablo");
        names.add("Gallen-Kallela, Akseli");
        names.add("Zotto, Osvaldo");
        names.add("Jason, Todd");
        names.add("Thiha, Soe");
        // 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> firstNameList = names.stream().map(n -> firstName(n)).collect(Collectors.toList());
        System.out.print("First names: ");
        for (String firstName : firstNameList) {
            System.out.print(firstName + " ");
        }
        System.out.println();
        // POINT C: Use map and the joining collector to created 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.
        List<String> lastNameList = names.stream().map(n -> lastName(n)).collect(Collectors.toList());
        System.out.print("Last names: ");
        for (String lastName : lastNameList) {
            System.out.print(lastName + " ");
        }
        System.out.println();
        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("HyphenatedLastNames: " + 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 firstNameTotalLength = firstNameList.stream().map(n -> n.length()).reduce(0,(n1, n2) -> n1 + n2);
        System.out.println("Total first names length: " + firstNameTotalLength);
        // POINT I: Print the integer value of the product of the length of all first names in the names ArrayList.
        int namesProductLength = firstNameList.stream().map(n -> n.length()).reduce(1,(n1,n2) -> n1*n2);
        System.out.println("Total product of names length: " + namesProductLength);
    }
    private static String lastName(String directoryStyleName) {
        int lastNameComma = directoryStyleName.indexOf(",");
        String lastName = directoryStyleName.substring(0,lastNameComma);
        return lastName;
    }
    private static String firstName(String directoryStyleName) {
        int firstNameComma = directoryStyleName.indexOf(",");
        String firstName = directoryStyleName.substring(firstNameComma+2);
        return firstName;
    }

}