package fr.umlv.rental;

import static java.util.stream.Collectors.toSet;
import static org.junit.jupiter.api.Assertions.assertAll;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Optional;
import java.util.Set;
import java.util.stream.IntStream;
import java.util.stream.Stream;

import org.junit.jupiter.api.Test;

@SuppressWarnings("static-method")
public class RentalTest {
  @Test
  public void shouldCreateCarWhithModelAndYear() {
    var car = new Car("ford mustang", 2014);
    assertEquals("ford mustang", car.getModel());
  }

  @Test
  public void shouldGetErrorWhenCreatingCarWhithoutModel() {
    assertThrows(NullPointerException.class, () -> new Car(null, 2014));
  }
  
  @Test
  public void shouldGetErrorWhenRemovingCarOnEmptyRental() {
    var rental = new CarRental();
    assertThrows(IllegalStateException.class, () -> rental.remove(new Car("ford mustang", 2013)));
  }
  
  @Test
  public void shouldGetErrorWhenAddingNonExistentCarToRental() {
    var rental = new CarRental();
    assertThrows(NullPointerException.class, () -> rental.add(null));
  }

  @Test
  public void shouldAddLotsOfNewCarsToRental() {
    var rental = new CarRental();
    IntStream.range(0, 1_000_000).forEach(i -> rental.add(new Car("foo car", i)));
  }
  
  @Test
  public void shouldRemoveCarOfRental() {
    var rental = new CarRental();
    rental.add(new Car("ford mustang", 2013));
    rental.remove(new Car("ford mustang", 2013));
    assertEquals("", rental.toString());
  }
  
  @Test
  public void shouldConvertRentalToText() {
    var rental = new CarRental();
    rental.add(new Car("audi tt", 2001));
    rental.add(new Car("ford mustang", 2006));
    assertEquals("audi tt 2001\nford mustang 2006", rental.toString());
  }
  
  @Test
  public void shouldFindCarByYearInRental() {
    var rental = new CarRental();
    rental.add(new Car("audi tt", 2012));
    rental.add(new Car("ford mustang", 2014));
    var all = rental.findAllByYear(2014);
    assertTrue(all.contains(new Car("ford mustang", 2014)));
  }
  
  @Test
  public void shouldNotFindAnyCarWhenSearchingNonExistantYear() {
    var rental = new CarRental();
    rental.add(new Car("audi tt", 2015));
    rental.add(new Car("ford mustang", 2013));
    var toSell = rental.findAllByYear(2014);
    assertTrue(toSell.isEmpty());
  }
  
  @Test
  public void shouldVerifyEqualityOfIdenticalCamels() {
    var camel = new Camel(2014);
    assertEquals(camel, new Camel(2014));
  }
  
  @Test
  public void shouldConvertCamelToText() {
    var camel = new Camel(2014);
    assertEquals("camel 2014", camel.toString());
  }
  
  @Test
  public void shouldAddAndRemoveCarsOrCamelsOfRental() {
    var rental = new CarRental();
    rental.add(new Car("ford mustang", 2014));
    rental.add(new Camel(2010));
    rental.remove(new Camel(2010));
    rental.remove(new Car("ford mustang", 2014));
  }
  
  @Test
  public void shouldGetErrorWhenRemovingCamelOnEmptyRental() {
    var rental = new CarRental();
    assertThrows(IllegalStateException.class, () -> rental.remove(new Camel(2010)));
  }
  
  @Test
  public void shouldFindCarsAndCamelsByYearInRental() {
    var rental = new CarRental();
    rental.add(new Car("ford mustang", 2010));
    rental.add(new Camel(2010));
    var list = rental.findAllByYear(2010);
    assertAll(
      () -> assertTrue(list.contains(new Car("ford mustang", 2010))),
      () -> assertTrue(list.contains(new Camel(2010)))
      );
  }
  
  @Test
  public void shouldDistinguishBetweenCarsAndCamelWithSameYear() {
    var rental = new CarRental();
    rental.add(new Car("ford mustang", 2010));
    rental.add(new Camel(2010));
    var list = rental.findAllByYear(2010);
    var set = new HashSet<>(list);
    assertAll(
        () -> assertTrue(set.contains(new Car("ford mustang", 2010))),
        () -> assertTrue(set.contains(new Camel(2010)))
        );
  }
  
  @Test
  public void shouldGetErrorWhenSearchingNonExistentCarInRental() {
    var rental = new CarRental();
    assertThrows(NullPointerException.class, () -> rental.findACarByModel(null));
  }
  
  @Test
  public void shouldComputeInsuranceCostOfRental() {
    var rental = new CarRental();
    rental.add(new Car("audi tt", 2001));
    rental.add(new Car("ford mustang", 2009));
    rental.add(new Camel(2013));
    rental.add(new Camel(2010));
    assertEquals(rental.insuranceCostAt(2017), 1800);
  }
  
  private static Set<Class<?>> implementedInterfaces(Class<?> clazz) {
    return Stream.<Class<?>>iterate(clazz, type -> type != Object.class, Class::getSuperclass)
        .flatMap(type -> Arrays.stream(type.getInterfaces()))
        .collect(toSet());
  }
  
  @Test
  public void shouldCarAndCamelHaveACommonSuperType() {
  assertAll(
        () -> assertFalse(implementedInterfaces(Car.class).isEmpty()),
        () -> assertFalse(implementedInterfaces(Camel.class).isEmpty()),
        () -> assertFalse(Collections.disjoint(implementedInterfaces(Car.class), implementedInterfaces(Camel.class)))
    );
  }
  
  @Test
  public void shouldCarAndCamelSuperAbstractClassIfItExistsNotBePublic() {
    var abstractAndPublic = Modifier.ABSTRACT | Modifier.PUBLIC;
    assertFalse((Car.class.getSuperclass().getModifiers() & abstractAndPublic) == abstractAndPublic);
    assertFalse((Camel.class.getSuperclass().getModifiers() & abstractAndPublic) == abstractAndPublic);
  }
  
  @Test
  public void shouldGetErrorIfWhenAskingAnInsuranceCostWithADateOlderThanTheCarCreation() {
    var rental = new CarRental();
    rental.add(new Car("audi tt", 2001));
    assertThrows(IllegalArgumentException.class, () -> rental.insuranceCostAt(2000));
  }
  
  @Test
  public void shouldGetErrorIfWhenAskingAnInsuranceCostWithADateOlderThanTheCamelBirth() {
    var rental = new CarRental();
    rental.add(new Camel(2013));
    assertThrows(IllegalArgumentException.class, () -> rental.insuranceCostAt(2012));
  }

  @Test
  public void shouldFindACarByModelInRental() {
    var rental = new CarRental();
    rental.add(new Car("ford mustang", 2020));
    rental.add(new Camel(2003));
    Optional<Car> tmp = rental.findACarByModel("ford mustang");
    assertEquals(new Car("ford mustang", 2020), tmp.orElseThrow());
  }
  
  @Test
  public void shouldNotFindACarByNonExistantModelInRental() {
    var rental = new CarRental();
    rental.add(new Car("renault alpine", 1992));
    rental.add(new Camel(1992));
    assertFalse(rental.findACarByModel("ford mustang").isPresent());
  }
}