<?php

/**
 * @package     MokoJoomCross
 * @subpackage  com_mokojoomcross
 * @author      Moko Consulting <hello@mokoconsulting.tech>
 * @copyright   Copyright (C) 2026 Moko Consulting. All rights reserved.
 * @license     GNU General Public License version 3 or later; see LICENSE
 * SPDX-License-Identifier: GPL-3.0-or-later
 */

namespace Joomla\Component\MokoJoomCross\Administrator\Controller;

defined('_JEXEC') or die;

use Joomla\CMS\Factory;
use Joomla\CMS\Language\Text;
use Joomla\CMS\MVC\Controller\BaseController;
use Joomla\CMS\Plugin\PluginHelper;
use Joomla\CMS\Router\Route;
use Joomla\Component\MokoJoomCross\Administrator\Helper\OAuthHelper;

/**
 * OAuth controller for handling browser-based authorization flows.
 *
 * Endpoints:
 *   task=oauth.authorize  — Initiate OAuth flow (redirect to platform)
 *   task=oauth.callback   — Handle platform redirect with auth code
 */
class OauthController extends BaseController
{
    /**
     * Initiate OAuth authorization for a service.
     *
     * Expects: service_id (int) in request
     */
    public function authorize(): void
    {
        $this->checkToken();

        $serviceId = $this->input->getInt('service_id', 0);

        if (!$serviceId) {
            $this->setRedirect(
                Route::_('index.php?option=com_mokojoomcross&view=services', false),
                Text::_('COM_MOKOJOOMCROSS_OAUTH_NO_SERVICE'),
                'error'
            );

            return;
        }

        $db = \Joomla\CMS\Factory::getDbo();

        $query = $db->getQuery(true)
            ->select('*')
            ->from($db->quoteName('#__mokojoomcross_services'))
            ->where($db->quoteName('id') . ' = ' . $serviceId);

        $db->setQuery($query);
        $service = $db->loadObject();

        if (!$service) {
            $this->setRedirect(
                Route::_('index.php?option=com_mokojoomcross&view=services', false),
                Text::_('COM_MOKOJOOMCROSS_OAUTH_SERVICE_NOT_FOUND'),
                'error'
            );

            return;
        }

        // Get client ID from plugin params
        PluginHelper::importPlugin('mokojoomcross');
        $pluginParams = PluginHelper::getPlugin('mokojoomcross', $service->service_type);
        $params = json_decode($pluginParams->params ?? '{}', true) ?: [];

        $clientId = $params['client_id'] ?? '';

        if (empty($clientId)) {
            $this->setRedirect(
                Route::_('index.php?option=com_mokojoomcross&view=services', false),
                Text::sprintf('COM_MOKOJOOMCROSS_OAUTH_NO_CLIENT_ID', ucfirst($service->service_type)),
                'error'
            );

            return;
        }

        // Generate CSRF nonce and store in session
        $nonce = bin2hex(random_bytes(16));
        Factory::getApplication()->getSession()->set('mokojoomcross.oauth_nonce', $nonce);

        $url = OAuthHelper::getAuthorizeUrl($service->service_type, $serviceId, $clientId, $nonce);

        if (!$url) {
            $this->setRedirect(
                Route::_('index.php?option=com_mokojoomcross&view=services', false),
                Text::sprintf('COM_MOKOJOOMCROSS_OAUTH_NOT_SUPPORTED', ucfirst($service->service_type)),
                'error'
            );

            return;
        }

        $this->app->redirect($url);
    }

    /**
     * Handle OAuth callback from platform.
     *
     * Expects: code (string), state (base64 JSON with service_id)
     */
    public function callback(): void
    {
        $code  = $this->input->getString('code', '');
        $state = $this->input->getString('state', '');
        $error = $this->input->getString('error', '');

        if ($error) {
            $this->setRedirect(
                Route::_('index.php?option=com_mokojoomcross&view=services', false),
                Text::sprintf('COM_MOKOJOOMCROSS_OAUTH_PLATFORM_ERROR', $error),
                'error'
            );

            return;
        }

        if (empty($code) || empty($state)) {
            $this->setRedirect(
                Route::_('index.php?option=com_mokojoomcross&view=services', false),
                Text::_('COM_MOKOJOOMCROSS_OAUTH_INVALID_CALLBACK'),
                'error'
            );

            return;
        }

        $stateData = json_decode(base64_decode($state), true);
        $serviceId   = (int) ($stateData['service_id'] ?? 0);
        $serviceType = $stateData['type'] ?? '';
        $stateNonce  = $stateData['nonce'] ?? '';

        if (!$serviceId || !$serviceType) {
            $this->setRedirect(
                Route::_('index.php?option=com_mokojoomcross&view=services', false),
                Text::_('COM_MOKOJOOMCROSS_OAUTH_INVALID_STATE'),
                'error'
            );

            return;
        }

        // CSRF nonce validation — compare state nonce against session
        $session      = Factory::getApplication()->getSession();
        $sessionNonce = $session->get('mokojoomcross.oauth_nonce', '');
        $session->clear('mokojoomcross.oauth_nonce');

        if (empty($stateNonce) || !hash_equals($sessionNonce, $stateNonce)) {
            $this->setRedirect(
                Route::_('index.php?option=com_mokojoomcross&view=services', false),
                Text::_('COM_MOKOJOOMCROSS_OAUTH_INVALID_STATE'),
                'error'
            );

            return;
        }

        // Get client credentials from plugin params
        PluginHelper::importPlugin('mokojoomcross');
        $pluginParams = PluginHelper::getPlugin('mokojoomcross', $serviceType);
        $params = json_decode($pluginParams->params ?? '{}', true) ?: [];

        $clientId     = $params['client_id'] ?? '';
        $clientSecret = $params['client_secret'] ?? '';

        $tokenData = OAuthHelper::exchangeCode($serviceType, $code, $clientId, $clientSecret);

        if (!empty($tokenData['error'])) {
            $this->setRedirect(
                Route::_('index.php?option=com_mokojoomcross&task=service.edit&id=' . $serviceId, false),
                Text::sprintf('COM_MOKOJOOMCROSS_OAUTH_TOKEN_ERROR', $tokenData['error']),
                'error'
            );

            return;
        }

        OAuthHelper::storeToken($serviceId, $tokenData);

        $this->setRedirect(
            Route::_('index.php?option=com_mokojoomcross&task=service.edit&id=' . $serviceId, false),
            Text::sprintf('COM_MOKOJOOMCROSS_OAUTH_SUCCESS', ucfirst($serviceType)),
            'success'
        );
    }
}