<?php namespace Myth\Auth\Filters;

use CodeIgniter\HTTP\RequestInterface;
use CodeIgniter\HTTP\ResponseInterface;
use CodeIgniter\Filters\FilterInterface;
use Myth\Auth\Exceptions\PermissionException;

class PermissionFilter implements FilterInterface
{
	/**
	 * Do whatever processing this filter needs to do.
	 * By default it should not return anything during
	 * normal execution. However, when an abnormal state
	 * is found, it should return an instance of
	 * CodeIgniter\HTTP\Response. If it does, script
	 * execution will end and that Response will be
	 * sent back to the client, allowing for error pages,
	 * redirects, etc.
	 *
	 * @param RequestInterface $request
	 * @param array|null                         $params
	 *
	 * @return mixed
	 */
	public function before(RequestInterface $request, $params = null)
	{
		if (! function_exists('logged_in'))
		{
			helper('auth');
		}

		if (empty($params))
		{
			return;
		}

		$authenticate = service('authentication');

		// if no user is logged in then send to the login form
		if (! $authenticate->check())
		{
			session()->set('redirect_url', current_url());
			return redirect('login');
		}

		$authorize = service('authorization');
		$result = true;

		// Check each requested permission
		foreach ($params as $permission)
		{
			$result = $result && $authorize->hasPermission($permission, $authenticate->id());
		}

		if (! $result)
		{
			if ($authenticate->silent())
			{
				$redirectURL = session('redirect_url') ?? '/';
				unset($_SESSION['redirect_url']);
				return redirect()->to($redirectURL)->with('error', lang('Auth.notEnoughPrivilege'));
			}
			else {
				throw new PermissionException(lang('Auth.notEnoughPrivilege'));
			}
		}
	}

	//--------------------------------------------------------------------

	/**
	 * Allows After filters to inspect and modify the response
	 * object as needed. This method does not allow any way
	 * to stop execution of other after filters, short of
	 * throwing an Exception or Error.
	 *
	 * @param RequestInterface  $request
	 * @param ResponseInterface $response
	 * @param array|null                          $arguments
	 *
	 * @return void
	 */
	public function after(RequestInterface $request, ResponseInterface $response, $arguments = null)
	{

	}

	//--------------------------------------------------------------------
}
