package demo;
// Creates lists of employees in a company, grouping them by category.
// Then creates a list of all employees from the aforementioned lists.
// Also creates a list of rather arbitrary objects.
// Prints these lists out.
// Demonstrates the use of wildcards in Java.

import java.util.ArrayList;

public class ManageEmployees {
  public static void main(String[] args) {
    ArrayList<WebDeveloper> webDevs = new ArrayList<>();
    webDevs.add(new WebDeveloper("Sir Timothy Berners-Lee"));
    webDevs.add(new WebDeveloper("Brendan Eich"));
    ArrayList<SystemsProgrammer> sysDevs = new ArrayList<>();
    sysDevs.add(new SystemsProgrammer("Grace Hopper"));
    sysDevs.add(new SystemsProgrammer("Donald Knuth"));
    ArrayList<Designer> designers = new ArrayList<>();
    designers.add(new Designer("Roberta Williams"));
    designers.add(new Designer("Sid Meier"));
    ArrayList<Theorist> theorists = new ArrayList<>();
    theorists.add(new Theorist("Shafrira Goldwasser"));
    theorists.add(new Theorist("Stephen Cook"));
    ArrayList<Programmer> devs = new ArrayList<>();
    devs.add(new Programmer("Richard Stallman"));
    devs.add(new Programmer("Bill Joy"));
    ArrayList<Object> objects = new ArrayList<>();
    objects.add(42);
    objects.add("Hello");
    objects.add(new Programmer("Linda Liukas"));

    System.out.println("Web devs: "); printNames(webDevs);
    System.out.println("Sys devs: "); printNames(sysDevs);
    System.out.println("Designers: "); printNames(designers);
    System.out.println("Theorists: "); printNames(theorists);
    System.out.println("General devs: "); printNames(devs);

    ArrayList<Employee> employees = new ArrayList<>();
    addElements(webDevs, employees);
    addElements(sysDevs, employees);
    addElements(designers, employees);
    addElements(theorists, employees);
    addElements(devs, employees);

    System.out.println("All employees: "); printNames(employees);

    System.out.println("Web devs (using toString):"); printAll(webDevs);
    System.out.println("objects (using toString):"); printAll(objects);

    System.out.println("Among web developers: ");
    printFavoriteLanguages(webDevs);

    addElements(webDevs, devs);
    addElements(sysDevs, devs);

    System.out.println("Among all developers: ");
    printFavoriteLanguages(devs);
  }

  // INSERT THE MISSING METHODS HERE ...
    public static <E extends Object> void printNames(ArrayList<E> inputArray) {
           for (E element : inputArray)
                  System.out.print(element);
           System.out.println();
       }

    public static <E> void addElements (ArrayList<E> inputArray1, ArrayList<? super E> inputArray2) {
        for (int i = 0 ; i < inputArray1.size(); i++) {
            inputArray2.add((E) inputArray1.get(i));
            }
        }

    public static <E> void printAll(ArrayList<E> inputArray) {
        for (int i = 0 ; i < inputArray.size() - 1; i++) {
            System.out.println(inputArray);
    }
}

    public static <E extends Programmer> void printFavoriteLanguages(ArrayList<E> inputArray) {
        for (int i = 0 ; i < inputArray.size(); i++) {
            E Employee = inputArray.get(i);
            String Fl = Employee.favoriteLanguage();
            System.out.println(Fl);
        }
    }
}

class Employee {
  private String name;
  public Employee (String name) {
    this.name = name;
  }
  public String name() {
      return name;
  }
}

class Programmer extends Employee {
  public Programmer(String name) {
    super(name);
  }
  public String favoriteLanguage() {
    return "Java";
  }
}

class WebDeveloper extends Programmer {
  public WebDeveloper(String name) {
    super(name);
  }
  public String favoriteLanguage() {
    return "JavaScript";
  }
}

class SystemsProgrammer extends Programmer {
  public SystemsProgrammer(String name) {
    super(name);
  }
  public String favoriteLanguage() {
    return "C";
  }
}

class Theorist extends Employee {
  public Theorist(String name) {
    super(name);
  }
}

class Designer extends Employee {
  public Designer(String name) {
    super(name);
  }
}