package model;

import java.sql.Date;
import java.text.SimpleDateFormat;
import java.text.ParseException;

public class Human extends Creature{
	private String name;
	private Date dob;

	/**
	 * Constructor
	 * @param name
	 * @param dob
	 */
	public Human(String name, String dob) {
		super();
		this.name = name;
		if (dob != "")
		{
			if (this.isValidDOB(dob)==true)
				this.dob = Date.valueOf(dob);
			else
				throw new IllegalArgumentException("Invalid date of birth.");
		}
	}

	/**
	 * Overloaded Constructor 
	 * @param name
	 */
	public Human(String name) {
		this(name,""); // call other constructor
	}

	
	public String getName(){
		return this.name;
	}
	
	public int getAge() {
		if (this.dob!=null)
		{
			Date now = new Date(System.currentTimeMillis());
			long diff = now.getTime() - this.dob.getTime();
			double age =  diff / 1000 / 60 /60 / 24 / 365.26;
			this.setAge((int) age);
			return (int) age;
		} else {
			return super.getAge();
		}
	}
	
	public boolean isValidDOB(String dob) {
		if (dob == null) return false;
		SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
		
		if (dob.trim().length() != df.toPattern().length()) return false;
	    df.setLenient(false);
	    
	    try {
	        //parse the dob parameter
	        df.parse(dob.trim());
	    } catch (ParseException pe) {
	    	return false;
	    }
	    
	    Date d1 = new Date(System.currentTimeMillis());
	    Date d2 = Date.valueOf(dob);
	    
	    if (d1.before(d2)) // future date? cannot be date of birth.
	    	return false;
	    else
	    	return true;  
	}
}