/*
 * CS161 Section 001
 * Shows an ArrayList of Pet
 * 
 */

import java.util.ArrayList;

public class Clinic {
	private ArrayList<Pet> ourPets; // the Pets are stored in this ArrayList.

	public Clinic() {
		ourPets = new ArrayList<Pet>();
	}
	
	public void addPet(Pet p) {
		ourPets.add(p);
	}
	
	public int countPets() {
		return ourPets.size();
	}
	
	public ArrayList<Pet> getPets() {
		return ourPets;
	}
	
	public double getAverageWeight() {
		double total = 0; // keeps the running sum of weights
		for(int i=0; i<=ourPets.size(); i++) {
			total = total + ourPets.get(i).getWeight();
		}
		
		/*
		 * Alternative way to traverse the list of Pets.
		for(Pet p : ourPets) {
			total = total + p.getWeight();
		}
		 */
		
		int number = countPets();
		if(number == 0) {
			return 0;
		} else {
			return total/number;
		}
	}

	 
	
	public static void main(String[] args) {
		
		Clinic c = new Clinic();
	
		int numPets = c.countPets();
		

		Pet p1 = new Pet();
		p1.setName("Nemo");
		p1.setWeight(13.5);
		c.addPet(p1);
		System.out.println(c.countPets());

		
		Pet p2 = new Pet("Loki");
		p2.setWeight(12.7);
		c.addPet(p2);
		System.out.println(c.countPets());
		
	
		System.out.println(c); // What does this print? No toString() defined for Clinic.
		System.out.println(c.getPets()); // What does this print? toString defined for ArrayList and Pet.
		System.out.println(c.getAverageWeight());
		
	}
}