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<?php declare(strict_types=1);

namespace Invoker\Reflection;

use Closure;

use Invoker\Exception\NotCallableException;

use ReflectionException;

use ReflectionFunction;

use ReflectionFunctionAbstract;

use ReflectionMethod;

/**

 * Create a reflection object from a callable or a callable-like.

 *

 * @internal

 */

class CallableReflection

{

    /**

     * @param callable|array|string $callable Can be a callable or a callable-like.

     * @throws NotCallableException|ReflectionException

     */

    public static function create($callable): ReflectionFunctionAbstract

    {

        // Closure

        if ($callable instanceof Closure) {

            return new ReflectionFunction($callable);

        }

        // Array callable

        if (is_array($callable)) {

            [$class, $method] = $callable;

            if (! method_exists($class, $method)) {

                throw NotCallableException::fromInvalidCallable($callable);

            }

            return new ReflectionMethod($class, $method);

        }

        // Callable object (i.e. implementing __invoke())

        if (is_object($callable) && method_exists($callable, '__invoke')) {

            return new ReflectionMethod($callable, '__invoke');

        }

        // Standard function

        if (is_string($callable) && function_exists($callable)) {

            return new ReflectionFunction($callable);

        }

        throw new NotCallableException(sprintf(

            '%s is not a callable',

            is_string($callable) ? $callable : 'Instance of ' . get_class($callable)

        ));

    }

}