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.List;
import java.util.Optional;
import java.util.Set;
import java.util.stream.IntStream;
import java.util.stream.Stream;

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

@SuppressWarnings("static-method")
public class RentalTest {
  @Test @Tag("Q1")
  public void shouldCreateCarWhithModelAndYear() {
    var car = new Car("ford mustang", 2014);
    assertEquals("ford mustang", car.getModel());
  }
  @Test @Tag("Q1")
  public void shouldGetErrorWhenCreatingCarWhithoutModel() {
    assertThrows(NullPointerException.class, () -> new Car(null, 2014));
  }
  
  @Test @Tag("Q2")
  public void shouldPrintACarWhithTheModelAndYear() {
    var car = new Car("ford mustang", 2019);
    assertEquals("ford mustang 2019", car.toString());
  }
  
  @Test @Tag("Q3")
  public void shouldAddLotsOfNewCarsToRental() {
    var rental = new CarRental();
    IntStream.range(0, 1_000_000).forEach(i -> rental.add(new Car("foo car", i)));
  }
  @Test @Tag("Q3")
  public void shouldGetErrorWhenAddingNonExistentCarToRental() {
    var rental = new CarRental();
    assertThrows(NullPointerException.class, () -> rental.add(null));
  }
  
  @Test @Tag("Q4")
  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 @Tag("Q4")
  public void shouldConvertRentalToEmptyTextIfEmpty() {
    var rental = new CarRental();
    assertEquals("", rental.toString());
  }
  
  @Test @Tag("Q5")
  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 @Tag("Q5")
  public void shouldGetErrorWhenRemovingANullCar() {
    var rental = new CarRental();
    assertThrows(NullPointerException.class, () -> rental.remove(null));
  }
  @Test @Tag("Q5")
  public void shouldEqualsAndHashCodeCorrectlyWritten() {
    var set = new HashSet<Car>();
    set.add(new Car("ford mustang", 2013));
    set.remove(new Car("ford mustang", 2013));
    assertTrue(set.isEmpty());
  }
  @Test @Tag("Q5")
  public void shouldEqualsTestStringsUsingEquals() {
  	var rental = new CarRental();
  	rental.add(new Car("ford mustang", 2017));
  	rental.remove(new Car(new String("ford mustang"), 2017));
  	assertEquals("", rental.toString());
  }
  
  @Test @Tag("Q7")
  public void shouldFindCarByYearInRental() {
    var rental = new CarRental();
    rental.add(new Car("audi tt", 2012));
    rental.add(new Car("ford mustang", 2014));
    var list = rental.findAllByYear(2014);
    assertAll(
    		() -> assertEquals(1, list.size()),
    		() -> assertEquals(list, List.of(new Car("ford mustang", 2014)))
    		);
  }
  @Test @Tag("Q7")
  public void shouldNotFindAnyCarWhenSearchingNonExistantYear() {
    var rental = new CarRental();
    rental.add(new Car("audi tt", 2015));
    rental.add(new Car("ford mustang", 2013));
    var list = rental.findAllByYear(2014);
    assertTrue(list.isEmpty());
  }
  
  @Test @Tag("Q8")
  public void shouldAddCarsOrCamelsOfRental() {
    var rental = new CarRental();
    rental.add(new Camel(2010));
    rental.add(new Car("ford mustang", 2014));
    rental.remove(new Car("ford mustang", 2014));
    assertEquals("camel 2010", rental.toString());
  }
  @Test @Tag("Q8")
  public void shouldAddAndRemoveCarsOrCamelsOfRental() {
    var rental = new CarRental();
    rental.add(new Camel(2010));
    rental.add(new Car("ford mustang", 2014));
    rental.remove(new Camel(2010));
    assertEquals("ford mustang 2014", rental.toString());
  }
  @Test @Tag("Q8")
  public void shouldACamelCanBeUsedWithASet() {
  	var set = new HashSet<Camel>();
    set.add(new Camel(2013));
    set.remove(new Camel(2013));
    assertTrue(set.isEmpty());
  }
  @Test @Tag("Q8")
  public void shouldACamelBeUsedWithAList() {
    var camel = new Camel(2014);
    var list = List.of(camel);
    assertEquals("[camel 2014]", list.toString());
  }
  @Test @Tag("Q8")
  public void shouldGetErrorWhenRemovingCamelOnEmptyRental() {
    var rental = new CarRental();
    assertThrows(IllegalStateException.class, () -> rental.remove(new Camel(2010)));
  }
  @Test @Tag("Q8")
  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 @Tag("Q8")
  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)))
        );
  }
  
  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 @Tag("Q9")
  public void shouldCarAndCamelHaveACommonSuperType() {
  assertAll(
        () -> assertFalse(implementedInterfaces(Car.class).isEmpty()),
        () -> assertFalse(implementedInterfaces(Camel.class).isEmpty()),
        () -> assertFalse(Collections.disjoint(implementedInterfaces(Car.class), implementedInterfaces(Camel.class)))
    );
  }
  @Test @Tag("Q9")
  public void shouldCarAndCamelSuperAbstractClassBePublic() {
    var abstractAndPublic = Modifier.ABSTRACT | Modifier.PUBLIC;
    assertFalse((Car.class.getSuperclass().getModifiers() & abstractAndPublic) == abstractAndPublic);
    assertFalse((Camel.class.getSuperclass().getModifiers() & abstractAndPublic) == abstractAndPublic);
  }
  
  @Test @Tag("Q11")
  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);
  }
  @Test @Tag("Q11")
  public void shouldEmptyCarRentalHasAnInsuranceCostOfZero() {
    var rental = new CarRental();
    assertEquals(0, rental.insuranceCostAt(2000));
  }
  @Test @Tag("Q11")
  public void shouldGetErrorIfWhenAskingAnInsuranceCostWithADateOlderThanTheCarCreation() {
    var rental = new CarRental();
    rental.add(new Car("audi tt", 2001));
    assertThrows(IllegalArgumentException.class, () -> rental.insuranceCostAt(2000));
  }
  @Test @Tag("Q11")
  public void shouldGetErrorIfWhenAskingAnInsuranceCostWithADateOlderThanTheCamelBirth() {
    var rental = new CarRental();
    rental.add(new Camel(2013));
    assertThrows(IllegalArgumentException.class, () -> rental.insuranceCostAt(2012));
  }

  @Test @Tag("Q12")
  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 @Tag("Q12")
  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());
  }
  @Test @Tag("Q12")
  public void shouldGetErrorWhenSearchingANullCar() {
    var rental = new CarRental();
    assertThrows(NullPointerException.class, () -> rental.findACarByModel(null));
  }
}