<?php

namespace Icinga\Module\Director\Web\Controller;

use Icinga\Application\Icinga;
use Icinga\Data\Paginatable;
use Icinga\Exception\AuthenticationException;
use Icinga\Exception\ConfigurationError;
use Icinga\Exception\NotFoundError;
use Icinga\Module\Director\Db;
use Icinga\Module\Director\Objects\IcingaEndpoint;
use Icinga\Module\Director\Web\Form\FormLoader;
use Icinga\Module\Director\Web\Table\TableLoader;
use Icinga\Web\Controller;
use Icinga\Web\Widget;

abstract class ActionController extends Controller
{
    protected $db;

    protected $isApified = false;

    private $api;

    public function init()
    {
        if ($this->getRequest()->isApiRequest()) {
            if (! $this->hasPermission('director/api')) {
                throw new AuthenticationException('You are not allowed to access this API');
            }

            if (! $this->isApified()) {
                throw new NotFoundError('No such API endpoint found');
            }
        }
    }

    protected function isApified()
    {
        return $this->isApified;
    }

    protected function applyPaginationLimits(Paginatable $paginatable, $limit = 25, $offset = null)
    {
        $limit = $this->params->get('limit', $limit);
        $page = $this->params->get('page', $offset);

        $paginatable->limit($limit, $page > 0 ? ($page - 1) * $limit : 0);

        return $paginatable;
    }

    public function loadForm($name)
    {
        $form = FormLoader::load($name, $this->Module());
        if ($this->getRequest()->isApiRequest()) {
            // TODO: Ask form for API support?
            $form->setApiRequest();
        }

        return $form;
    }

    public function loadTable($name)
    {
        return TableLoader::load($name, $this->Module());
    }

    protected function sendJson($object)
    {
        $this->getResponse()->setHeader('Content-Type', 'application/json', true);
        $this->_helper->layout()->disableLayout();
        $this->_helper->viewRenderer->setNoRender(true);
        if (version_compare(PHP_VERSION, '5.4.0') >= 0) {
            echo json_encode($object, JSON_PRETTY_PRINT) . "\n";
        } else {
            echo json_encode($object);
        }
    }

    protected function sendJsonError($message, $code = null)
    {
        if ($code !== null) {
            $this->setHttpResponseCode((int) $code);
        }

        $this->sendJson((object) array('error' => $message));
    }

    protected function setConfigTabs()
    {
        $this->view->tabs = Widget::create('tabs')->add(
            'deploymentlog',
            array(
                'label' => $this->translate('Deployments'),
                'url'   => 'director/list/deploymentlog'
            )
        )->add(
            'generatedconfig',
            array(
                'label' => $this->translate('Configs'),
                'url'   => 'director/list/generatedconfig'
            )
        )->add(
            'activitylog',
            array(
                'label' => $this->translate('Activity Log'),
                'url'   => 'director/list/activitylog'
            )
        );
        return $this->view->tabs;
    }

    protected function setDataTabs()
    {
        $this->view->tabs = Widget::create('tabs')->add(
            'datalist',
            array(
                'label' => $this->translate('Data lists'),
                'url'   => 'director/data/lists'
            )
        )->add(
            'datafield',
            array(
                'label' => $this->translate('Data fields'),
                'url'   => 'director/data/fields'
            )
        );
        return $this->view->tabs;
    }

    protected function setImportTabs()
    {
        $this->view->tabs = Widget::create('tabs')->add(
            'importsource',
            array(
                'label' => $this->translate('Import source'),
                'url'   => 'director/list/importsource'
            )
        )->add(
            'importrun',
            array(
                'label' => $this->translate('Import history'),
                'url'   => 'director/list/importrun'
            )
        )->add(
            'syncrule',
            array(
                'label' => $this->translate('Sync rule'),
                'url'   => 'director/list/syncrule'
            )
        );
        return $this->view->tabs;
    }

    protected function prepareTable($name)
    {
        $table = $this->loadTable($name)->setConnection($this->db());
        $this->view->filterEditor = $table->getFilterEditor($this->getRequest());
        $this->view->table = $this->applyPaginationLimits($table);
        return $this;
    }

    protected function prepareAndRenderTable($name)
    {
        $this->prepareTable($name)->render('list/table', null, true);
    }

    // TODO: just return json_last_error_msg() for PHP >= 5.5.0
    protected function getLastJsonError()
    {
        switch (json_last_error()) {
            case JSON_ERROR_DEPTH:
                return 'The maximum stack depth has been exceeded';
            case JSON_ERROR_CTRL_CHAR:
                return 'Control character error, possibly incorrectly encoded';
            case JSON_ERROR_STATE_MISMATCH:
                return 'Invalid or malformed JSON';
            case JSON_ERROR_SYNTAX:
                return 'Syntax error';
            case JSON_ERROR_UTF8:
                return 'Malformed UTF-8 characters, possibly incorrectly encoded';
            default:
                return 'An error occured when parsing a JSON string';
        }

        return $this;
    }

    protected function api($endpointName = null)
    {
        if ($this->api === null) {
            if ($endpointName === null) {
                $endpoint = $this->db()->getDeploymentEndpoint();
            } else {
                $endpoint = IcingaEndpoint::load($endpointName, $this->db());
            }

            $this->api = $endpoint->api();
        }

        return $this->api;
    }

    protected function db()
    {
        if ($this->db === null) {
            $resourceName = $this->Config()->get('db', 'resource');
            if ($resourceName) {
                $this->db = Db::fromResourceName($resourceName);
            } else {
                if ($this->getRequest()->isApiRequest()) {
                    throw new ConfigError('Icinga Director is not correctly configured');
                } else {
                    $this->redirectNow('director');
                }
            }
        }

        return $this->db;
    }
}