<?php
// {{{ICINGA_LICENSE_HEADER}}}
// {{{ICINGA_LICENSE_HEADER}}}

namespace Icinga\Form\Config\Authentication;

use Exception;
use Icinga\Data\ResourceFactory;
use Icinga\Exception\ConfigurationError;
use Icinga\Authentication\Backend\DbUserBackend;

/**
 * Form class for adding/modifying database authentication backends
 */
class DbBackendForm extends BaseBackendForm
{
    /**
     * The available database resources prepared to be used as select input data
     *
     * @var array
     */
    protected $resources;

    /**
     * Initialize this form
     *
     * Populates $this->resources.
     *
     * @throws  ConfigurationError  In case no database resources can be found
     */
    public function init()
    {
        $this->setName('form_config_authentication_db');
        $this->setSubmitLabel(t('Save Changes'));

        $dbResources = array_keys(
            ResourceFactory::getResourceConfigs('db')->toArray()
        );

        if (empty($dbResources)) {
            throw new ConfigurationError(
                t('There are no database resources')
            );
        }

        // array_combine() is necessary in order to use the array as select input data
        $this->resources = array_combine($dbResources, $dbResources);
    }

    /**
     * @see Form::createElements()
     */
    public function createElements(array $formData)
    {
        return array(
            $this->createElement(
                'text',
                'name',
                array(
                    'required'      => true,
                    'label'         => t('Backend Name'),
                    'helptext'      => t('The name of this authentication provider'),
                )
            ),
            $this->createElement(
                'select',
                'resource',
                array(
                    'required'      => true,
                    'label'         => t('Database Connection'),
                    'helptext'      => t('The database connection to use for authenticating with this provider'),
                    'multiOptions'  => $this->resources
                )
            ),
            $this->createElement(
                'hidden',
                'backend',
                array(
                    'required'  => true,
                    'value'     => 'db'
                )
            )
        );
    }

    /**
     * Validate the current configuration by creating a backend and requesting the user count
     *
     * @return  bool    Whether validation succeeded or not
     *
     * @see BaseBackendForm::isValidAuthenticationBackend()
     */
    public function isValidAuthenticationBackend()
    {
        try {
            $testConnection = ResourceFactory::createResource(ResourceFactory::getResourceConfig(
                $this->getValue('resource')
            ));
            $dbUserBackend = new DbUserBackend($testConnection);
            if ($dbUserBackend->count() < 1) {
                $this->addErrorMessage(t('No users found under the specified database backend'));
                return false;
            }
        } catch (Exception $e) {
            $this->addErrorMessage(sprintf(t('Using the specified backend failed: %s'), $e->getMessage()));
            return false;
        }

        return true;
    }
}