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<?php
namespace Plariumed\Facades;

use RuntimeException;

abstract class Facade
{
    protected static $app;

    protected static $resolvedInstance;

    /**
     * Get the root object behind the facade.
     *
     * @return mixed
     */
    public static function getFacadeRoot()
    {
        return static::resolveFacadeInstance(static::getFacadeAccessor());
    }

    /**
     * Get the registered name of the component.
     *
     * @return string
     *
     * @throws \RuntimeException
     */
    protected static function getFacadeAccessor()
    {
        throw new RuntimeException('Facade does not implement getFacadeAccessor method.');
    }

    /**
     * Resolve the facade root instance from the container.
     *
     * @param  string|object  $name
     * @return mixed
     */
    protected static function resolveFacadeInstance($name)
    {
        if (is_object($name)) {
            return $name;
        }

        if (isset(static::$resolvedInstance[$name])) {
            return static::$resolvedInstance[$name];
        }

        return static::$resolvedInstance[$name] = static::$app[$name];
    }

    /**
     * Get the application instance behind the facade.
     *
     * @return \Silex\Application
     */
    public static function getFacadeApplication()
    {
        return static::$app;
    }

    /**
     * Set the application instance.
     *
     * @param \Silex\Application $app
     * @return void
     */
    public static function setFacadeApplication($app)
    {
        static::$app = $app;
    }

    /**
     * Handle dynamic, static calls to the object.
     *
     * @param  string  $method
     * @param  array   $args
     * @return mixed
     */
    public static function __callStatic($method, $args)
    {
        $instance = static::getFacadeRoot();

        if (! $instance) {
            throw new RuntimeException('A facade root has not been set.');
        }

        switch (count($args)) {
            case 0:
                return $instance->$method();

            case 1:
                return $instance->$method($args[0]);

            case 2:
                return $instance->$method($args[0], $args[1]);

            case 3:
                return $instance->$method($args[0], $args[1], $args[2]);

            case 4:
                return $instance->$method($args[0], $args[1], $args[2], $args[3]);

            default:
                return call_user_func_array([$instance, $method], $args);
        }
    }
}

<?php
// Example with Silex

class Service
{
  public function foo()
  {
    return 'bar';
  }
}

$app['service'] = $app->share(function () {
  return new Service();
});

Facade::setFacadeApplication($app);

class Srv extendes Facade
{
    protected static function getFacadeAccessor()
    {
        return 'service';
    }
}

echo Srv::foo(); // => bar