import static org.junit.jupiter.api.Assertions.*;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

import java.lang.reflect.Method;

class AnimalTest {

	@Test
	@DisplayName("Test comparable implementation for Animal class")
	void comparableTest() {
        ArrayList<Animal> listOfAnimals = new ArrayList<Animal>();
        
        Wolf wolf1 = new Wolf();
        Parrot parrot1 = new Parrot(5, "Feathers");
        Wolf wolf2 = new Wolf(3, "Fuzzy");
        Parrot parrot2 = new Parrot(7, "Polly");
        
        listOfAnimals.add(wolf1);
        listOfAnimals.add(parrot1);
        listOfAnimals.add(wolf2);
        listOfAnimals.add(parrot2);

        ArrayList<Integer> orderedAges = new ArrayList<Integer> (Arrays.asList(0,3,5,7));
        ArrayList<Integer> ages = new ArrayList<Integer>();
        
        Collections.sort(listOfAnimals);
        
        for(Animal animal : listOfAnimals) {
        	ages.add(animal.getAge());
        }
        
        assertEquals(ages, orderedAges, "Testing that comparable sorts by age correctly");
        
        Class animalClass = null;
        
        Class c = wolf1.getClass().getSuperclass();
        	
        if(c.equals("class Animal")) {
        	animalClass = c;
        }else {
        	c = wolf1.getClass().getSuperclass().getSuperclass();
            if(c.equals("class Animal")) {
            	animalClass = c;
            }
        }

        Method[] methods = animalClass.getDeclaredMethods();
        
        Boolean implementsComparable = false;
        Boolean containsCompareTo = false;
        
        for(int i=0;i<methods.length;i++) {
        	String methodName = methods[i].toString();
        	if(methodName.equals("public int Animal.compareTo(java.lang.Object)")) {
        		implementsComparable = true;
        	}else if(methodName.equals("public int Animal.compareTo(Aniaml)")) {
        		containsCompareTo = true;
        	}
        }
        
        assertTrue(implementsComparable, "Testing that Animal implements comparable");
        assertTrue(containsCompareTo, "Testing that Animal contains the compare to method");
        
	}
}