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<?php
namespace Win;
use ReflectionClass;
use ReflectionParameter;
/**
 * Dependence Injector
 * 
 * Se há um apelido para a classe dentro de $container,
 * então ela será utilizada ao invés da classe original.
 */
abstract class DI
{
    /**
     * Armazena os nomes de classes
     * @var string[]
     */
    public static $container = [];
    public static $instances = [];
    /**
     * Cria a classe, injetando as dependências
     * @param string $class
     * @return object
     */
    public static function instance(string $class)
    {
        $class = static::$container[$class] ?? $class;
        if (!key_exists($class, static::$instances)) {
            $args = [];
            $con = (new ReflectionClass($class))->getConstructor();
            /** @var ReflectionParameter[] $params */
            $params = $con ? $con->getParameters() : [];
            foreach ($params as $param) {
                if ($param->getType()) {
                    $args[] = static::instance($param->getType()->getName());
                }
            }
            static::$instances[$class] = new $class(...$args);
        }
        return static::$instances[$class];
    }
}