package registrationsystem;

import java.time.LocalDate;
import java.time.Period;
import java.time.temporal.ChronoUnit;
import java.util.ArrayList;
import java.util.List;


public class Instructor {

	//instance string variables that describe the employees' personal information.
	public String FirstName;
	public String LastName;
	public String StreetAddress;
	public String City;
	public String PostalCode;

	//instance int variables that describe the employees' employee Number.
	public int EmployeeNumber;

	//instance LocalDate variable that describe the employees' of date of birth and hiring date.
	public LocalDate DateOfBirth;
	public LocalDate HiringDate;

	//instance variable for the CurrentDate for the Students' Age.
	public static LocalDate CurrentDateOfInstructorsAge = LocalDate();

    private static java.time.LocalDate LocalDate() {
    	// TODO Auto-generated method stub
    	return null;
    }

	//instance variable for list of courses.
	public List<Course> Courses = new ArrayList<>();

	//constructor for the variables above.
	public Instructor(String FirstName, String LastName, int EmployeeNumber, String StreetAddress,
			String City, String PostalCode, LocalDate HiringDate, LocalDate DateOfBirth) {
		this.FirstName = FirstName;
		this.LastName = LastName;
		this.StreetAddress = StreetAddress;
		this.City = City;
		this.PostalCode = PostalCode;
		this.EmployeeNumber = EmployeeNumber;
		this.DateOfBirth = DateOfBirth;
		this.HiringDate = HiringDate;

	}

	//get FirstName
	public String getFirstName() {
		return FirstName;
	}

	//set FirstName
	public void setFirstName(String FirstName) {
		this.FirstName = FirstName;
	}

	//get LastName
	public String getLastName() {
		return LastName;
	}

	//set LastName
	public void setLastName(String LastName) {
		this.LastName = LastName;
	}

    @Override
    public String toString(){
     return FirstName + LastName;
    }

	//get StreetAddress
	public String getStreetAddress() {
		return StreetAddress;
	}

	//set StreetAddress
	public void setStreetAddress(String StreetAddress) {
		this.StreetAddress = StreetAddress;
	}

	//get for changing the address within the registration system.
	public String getAddress() {
		return StreetAddress + "," +City+","+PostalCode;
	}

	//set for changing the address within the registration system.
	public void changeAddress(String StreetAddress, String City, String PostalCode) {
		this.StreetAddress = StreetAddress;
		this.City = City;
		this.PostalCode = PostalCode;
	}

	//get City
	public String getCity() {
		return City;
	}

	//set City
	public void getCity(String City) {
		this.City = City;
	}

	//get PostalCode
	public String getPostalCode() {
			return PostalCode;
	}

	//set PostalCode
	public void setPostalCode(String PostalCode) {
		this.PostalCode = PostalCode;
	}

	//get EmployeeNumber
	public int getEmployeeNumber() {
		return EmployeeNumber;
	}

	//set EmployeeNumber
	public void setEmployeetNumber(int EmployeeNumber) {
		this.EmployeeNumber = EmployeeNumber;
	}

	//get DateOfBirth
	public LocalDate getDateOfBirth() {
		return DateOfBirth;
	}

	//set DateOfBirth
    public void setDateOfBirth(LocalDate DateOfBirth) {
    	int age = Period.between(LocalDate(), DateOfBirth).getYears();
    if(age > 80) {
      throw new IllegalArgumentException("Please check the year entered, instructor cannot be over 100 years old.");
    }else {
      this.DateOfBirth = DateOfBirth;
    }
    }

	//get Instructors' Birthday
	public LocalDate getBirthday() {
		return DateOfBirth;
	}

    //set Instructors' Birthday
	public void setBirthday(LocalDate Birthday) {
    	int age = Period.between(LocalDate(), Birthday).getYears();
    if(age > 100) {
      throw new IllegalArgumentException("Please check the year entered, instructor cannot be over 100 years old");
    }else {
      this.DateOfBirth = Birthday;
    }
    }

	//get AgeInYears
	public int getAgeInYears() {
		long diff = ChronoUnit.YEARS.between(DateOfBirth, LocalDate());
		return (int) diff;
	}

	//set AgeInYears
	public void setAgeInYears(LocalDate AgeInYears) {
		this.DateOfBirth = DateOfBirth;
	}

    //get YearsAtCollege
    public int yearsAtCollege() {
    	long diff = ChronoUnit.YEARS.between(HiringDate, LocalDate());
		return (int) diff;
    }

    //set YearsAtCollege
  	public void setyearsAtCollege(LocalDate YearsAtCollege) {
  		this.HiringDate = HiringDate;
  	}

  	//get list Course
  	public List<Course> getCourses() {
  		return Courses;
  	}

  	//set list Course
  	public void setCourses(List<Course> Courses) {
  		this.Courses = Courses;
  	}