<?php
namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

#[ORM\Entity]
class Author
{
    #[ORM\Id]                    // ← Clé primaire
    #[ORM\GeneratedValue]        // ← Auto-incrément
    #[ORM\Column]               // ← Colonne en base
    private ?int $id = null;

    #[ORM\Column(length: 255)]  // ← VARCHAR(255)
    private ?string $name = null;
    
    // Getters et setters...
}

#[ORM\Entity]
class Author
{
    // Propriétés de base...
    
    #[ORM\OneToMany(
        mappedBy: 'author',           // ← Propriété dans Book
        targetEntity: Book::class,    // ← Classe cible
        cascade: ['persist', 'remove'] // ← Actions auto
    )]
    private Collection $books;

    public function __construct()
    {
        // 🚨 OBLIGATOIRE : Initialiser la collection
        $this->books = new ArrayCollection();
    }
}

public function addBook(Book $book): static
{
    if (!$this->books->contains($book)) {
        $this->books->add($book);
        $book->setAuthor($this); // 🚨 Maintenir la cohérence
    }
    return $this;
}

public function removeBook(Book $book): static
{
    if ($this->books->removeElement($book)) {
        if ($book->getAuthor() === $this) {
            $book->setAuthor(null);
        }
    }
    return $this;
}

#[ORM\Entity]
class Book
{
    // Propriétés de base...
    
    #[ORM\ManyToOne(
        inversedBy: 'books'    // ← Propriété dans Author
    )]
    #[ORM\JoinColumn(nullable: false)] // ← Un livre DOIT avoir un auteur
    private ?Author $author = null;

    public function getAuthor(): ?Author
    {
        return $this->author;
    }

    public function setAuthor(?Author $author): static
    {
        $this->author = $author;
        return $this;
    }
}

#[ORM\Entity]
class Student
{
    #[ORM\ManyToMany(
        targetEntity: Course::class, 
        inversedBy: 'students'
    )]
    #[ORM\JoinTable(name: 'student_course')] // ← Table intermédiaire
    private Collection $courses;

    public function __construct()
    {
        $this->courses = new ArrayCollection();
    }
    
    // Méthodes add/remove similaires...
}

#[ORM\Entity]
class Course
{
    #[ORM\ManyToMany(
        targetEntity: Student::class, 
        mappedBy: 'courses'  // ← Propriété dans Student
    )]
    private Collection $students;

    public function __construct()
    {
        $this->students = new ArrayCollection();
    }
    
    // Méthodes add/remove...
}

#[Route('/test-entities')]
public function testEntities(EntityManagerInterface $em): Response
{
    // Créer un article
    $article = new Article();
    $article->setTitle('Mon premier article');
    
    // Créer un commentaire
    $comment = new Comment();
    $comment->setContent('Super article !');
    $comment->setAuthor('Alice');
    
    // Lier le commentaire à l'article
    $article->addComment($comment);
    
    // Sauvegarder (cascade fait le reste)
    $em->persist($article);
    $em->flush();
    
    return new Response('Succès !');
}