<?php
// 4. Models/Model.php – ORM micro 60 lignes, CRUD + relations
namespace Models;
use PDO;
abstract class Model {
    protected static string $table;
    protected array $data = [];
    public function __get($k) { return $this->data[$k]; }
    public function __set($k, $v) { $this->data[$k] = $v; }
    public static function pdo(): PDO {
        static $pdo;
        return $pdo ??= new PDO(DB_DSN, DB_USER, DB_PASS, [PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION]);
    }
    public static function all(): array {
        return static::pdo()->query("SELECT * FROM " . static::$table)->fetchAll(PDO::FETCH_CLASS, static::class);
    }
    public static function find(int $id): ?static {
        $stmt = static::pdo()->prepare("SELECT * FROM " . static::$table . " WHERE id = ?");
        $stmt->execute([$id]);
        return $stmt->fetchObject(static::class) ?: null;
    }
    public function save(): void {
        $cols = implode(',', array_keys($this->data));
        $vals = implode(',', array_fill(0, count($this->data), '?'));
        $sql = $this->data['id'] ?
            "UPDATE " . static::$table . " SET " . implode(' = ?, ', array_keys($this->data)) . " = ? WHERE id = ?" :
            "INSERT INTO " . static::$table . " ($cols) VALUES ($vals)";
        $stmt = static::pdo()->prepare($sql);
        $stmt->execute($this->data['id'] ? array_values(array_merge($this->data, ['id' => $this->data['id']])) : array_values($this->data));
    }
    public function delete(): void {
        static::pdo()->prepare("DELETE FROM " . static::$table . " WHERE id = ?")->execute([$this->data['id']]);
    }
}