/**
 * Jeg har skrevet litt på dette prosjektet etter å ha arbeidet med modul 9. 
 * Jeg har innført superklassen person, slik at jeg med subklassene kan skille
 * mellom lærere og studenter. Dette tas hensyn til i noen lab-class-metoder 
 * ved at jeg bruker "instanceof"-metoden. Jeg har også lagt til litt 
 * interaktivitet (inspirert av zuul-spillet). 
 * Dette kan testes ved å prøve å legge til flere studenter i en full klasse.
 * 
 * Jeg bruker i dette prosjektet flere av metodene som sto under læremåla 
 * for modulen, men ikke alle. Jeg har også jobbet med zuul-spillet mens jeg har
 * jobbet med arv, men jeg ønsket ikke å levere dette prosjektet enda ettersom 
 * det er blitt ganske omfattende og krever litt forklaring og finpuss.
 * 
 * Ellers har jeg i modul ni lært om "substitution". Det vil si at ved å bruke
 * super- og subklasser kan en lagre forskjellige objekter i variabler.
 * Under har jeg noen utsagn fra dette prosjektet for å illustrere:
 * Person p1 = new Student();   - dette ville være en godkjent kommando, for person kan lagre alle typer
 *                                personer, inkl. subklassene student og teacher
 * Person p2 = new Person();    - dette er også en godkjent kommando, for person er en person
 * Teacher t1 = new Person();   - dette er derimot IKKE en godkjent kommando, for en ny person kan være både person,         
 *                                teacher og student. Dermed passer ikke dette nødvendigvis inn i Teacher-variabelen t1.
 *
 *Dersom dette ikke er nok for å få godkjent modul 9 kan jeg selvsagt
 *utvide eller levere deler av zuul-prosjektet mitt, skrive mer utfyldende tekst
 *eller ta en tur innom kontoret en dag. :)
 *
 *@author Arild Høyland
 *@version 0.3
 * 
 * -----------------------------------------------------------------------------------------------------------------
 *The LabClass class represents an enrolment list for one lab class. It stores
 * the time, room and participants of the lab, as well as the instructor's name.
 * 
 * @author Michael Kölling and David Barnes
 * @version 2011.07.31
 */
import java.util.*;
public class LabClass extends School
{
    private String room;
    private String time;
    private int capacity;
    private Person teacher;
    private String className = "Biology 101";
        
    /**
     * Create a LabClass with a maximum number of enrolments. All other details
     * are set to default values.
     * @param maxNumberOfStudents student capacity for this class
     */
    public LabClass(int maxNumberOfStudents)
    {
        super();
        room = "unknown";
        time = "unknown";
        students = new ArrayList<Person>();
        capacity = maxNumberOfStudents;
    }

    /**
     * Enrolls a person in this LabClass.
     * @param person (student) to be added to this class
     */
    public String enrollStudent(Person person)
    {
        if (person instanceof Student)   {
            if (students.size() >= capacity) {
                return"The class is full, you cannot enroll. Do you wish to expand the class?";
            }
            else    {
               students.add(person);
               return"Student ' " + person.getName() + "' added to class.";
            }
        }
        else    {
            return"This isn't a student. You can only enroll students.";
        }
    }
    
    
    /**
     * Enrolls a student in a class, after having changed capacity using setCapacityText().
     * Used in enrollStudent(Person person)
     * @param person - person to be enrolled in class
     */
    private void enrollStudentText(Person person)
    {
        boolean finished = false;
        while(!finished)    {
            Scanner inputStudent = new Scanner(System.in);
            System.out.println("Do you wish to add the student to the class?");
            String svarStudent = inputStudent.nextLine().toLowerCase();
                  if (svarStudent.equals("yes"))
                  {
                      students.add(person); 
                      System.out.println("Student '" + person.getName() + " has been added to the class. Number of students in class is now " 
                                            + students.size() + ".\n Application terminated.");
                      finished = true;
                    }
                    else if(svarStudent.equals("no"))
                    {
                        System.out.println("Student has NOT been added to the class. Number of students in class is now: " 
                                            + students.size() + ".\n Application terminated.");
                        finished = true;  
                    }
                    else 
                    {
                        System.out.println("I could not understand you. Please reply either 'yes' or 'no'.");
                    }
        }
    }
       
     /**
     * Return the number of students currently enrolled in this LabClass.
     * @return number of students in class
     */
    public int numberOfstudents()
    {
        return students.size();
    }
    
    /**
     * Change capacity of the class
     * @param capacity max number of students in class
     */
    public void setCapacity(int capacity)
    {
        this.capacity = capacity;
    }
    
    /**
     * Get capacity of this class
     * @return max number of students in class
     */
    public int getCapacity()
    {
        return capacity;
    }
    
    /**
     * Set the room number for this LabClass.
     * @param roomNumber sets room for this class
     */
    public void setRoom(String roomNumber)
    {
        room = roomNumber;
    }
    
    /**
     * Gets the room this class is in
     * @return room this class is held in
     */
    public String getRoom()
    {
        return room;
    }
    
    /**
     * Set the time for this LabClass. The parameter should define the day
     * and the time of day, such as "Friday, 10am".
     * @param timeAndDayString sets the time and day of this class
     */
    public void setTime(String timeString)
    {
        time = timeString;
    }
    
    /**
     * Gets the time and day of the class in the format: DAY, HH:MM
     * @return day and time of class
     */
    public String getTime()
    {
        return time;
    }
    
    /**
     * Gets the name of this class
     * @return returns name of class
     */
    public String getClassName()
    {
        return className;
    }
    
    /**
     * Sets name of this class
     * @param string with new name of class
     */
    public void setClassName(String className)
    {
        this.className = className;
    }
    
    public void printStudents()
    {
        for(Person person : students)   {
            person.print();
        }
    }
    
    /**
     * Print out a class list with other LabClass details to the standard
     * terminal.
     */
    public void printList()
    {
        System.out.println("Lab class: " + room);
        System.out.println("Schedule: " + time);
        System.out.println("Class capacity: " + capacity);
        if(this.teacher == null)
        {
            System.out.println("No teacher assigned!");
        }
        else
        {
            System.out.println("Teacher: " + this.teacher.getName());
        }
        System.out.println("Class list:");
        for(Person person : students) {
            person.print();
        }
        System.out.println("Number of students: " + numberOfstudents());
    }
    
    /**
     * Adds a teacher to this class
     * @param person teacher to add to this class
     */
    public void addTeacher(Person person)
    {
        if(person instanceof Teacher)   {
            if(this.teacher != null)
            {
                boolean finished = false;
                while(finished != true)
                {
                    Scanner input = new Scanner(System.in);
                    System.out.println("\nThere is already a teacher assigned, do you wish to replace this teacher?");
                    String svar = input.nextLine().toLowerCase();
                    if(svar.equals("yes"))
                    {
                        addTeacherText(person);
                        finished = true;
                    }
                    else if(svar.equals("no"))
                    {
                        finished = true;
                        System.out.println("Teacher has not been changed. Application terminated.");
                    }
                    else 
                    {
                        System.out.println("I could not understand you. Please reply either 'yes' or 'no'.");
                    }
                }
            }
            else
            {
                this.teacher = person;
            }
        }
        else    {
            System.out.println("This isn't a teacher. You can only add teachers.");
        }
    }
    
    /**
     * Adds teacher by asking the user for an input in text format
     * Used (called by) addTeacher(Person person)
     * @param person teacher to be added to this class
     */
    private void addTeacherText(Person person)
    {
            this.teacher = person;
            System.out.println("Teacher has been changed. New teacher is " + person.getName() + ". Application terminated.");
    }
    
    public void removeTeacher()
    {
        teacher = null;
    }
        
}