<?php

namespace BitCode\BitFormPro\Integration\Dropbox;

use WP_Error;
use BitCode\BitForm\Core\Util\HttpHelper;
use BitCode\BitFormPro\Integration\Dropbox\RecordApiHelper as DropboxRecordApiHelper;
use BitCode\BitForm\Core\Integration\IntegrationHandler;
use BitCode\BitForm\Core\Util\ApiResponse;
use BitCode\BitForm\Core\Util\IpTool;

class DropboxHandler
{
    private $formID;
    private $integrationID;
    protected static $apiBaseUri = 'https://api.dropboxapi.com';
    protected static $contentBaseUri = 'https://content.dropboxapi.com';

    public function __construct($integrationID, $fromID)
    {
        $this->formID = $fromID;
        $this->integrationID = $integrationID;
    }

    /**
     * Helps to register ajax function's with wp
     *
     * @return null
     */
    public static function registerAjax()
    {
        add_action('wp_ajax_bitforms_dropbox_authorization', array(__CLASS__, 'checkAuthorization'));
        add_action('wp_ajax_bitforms_dropbox_get_all_folders', array(__CLASS__, 'getAllFolders'));
    }

    /**
     * authorize dropbox
     *
     * @return JSON
     */
    public static function checkAuthorization()
    {
        if (!isset($_REQUEST['_ajax_nonce']) && !wp_verify_nonce($_REQUEST['_ajax_nonce'], 'bitforms_save')) {
            wp_send_json_error(__('Token expired', 'bitformpro'), 401);
        }

        $inputJSON = file_get_contents('php://input');
        $queryParams = json_decode($inputJSON);

        if (empty($queryParams->accessCode) || empty($queryParams->apiKey) || empty($queryParams->apiSecret)) {
            wp_send_json_error(__('Requested parameter is empty', 'bitformpro'), 400);
        }

        $body = [
            'code' => $queryParams->accessCode,
            'grant_type' => 'authorization_code',
            'client_id' => $queryParams->apiKey,
            'client_secret' => $queryParams->apiSecret,
        ];

        $apiEndpoint = self::$apiBaseUri . '/oauth2/token';
        $apiResponse = HttpHelper::post($apiEndpoint, $body);

        if (is_wp_error($apiResponse) || !empty($apiResponse->error)) {
            wp_send_json_error(empty($apiResponse->error_description) ? 'Unknown' : $apiResponse->error_description, 400);
        }
        $apiResponse->generates_on = \time();
        wp_send_json_success($apiResponse, 200);
    }

    /**
     * get dropbox folders List
     *
     * @return JSON
     */
    public static function getAllFolders()
    {
        if (!isset($_REQUEST['_ajax_nonce']) && !wp_verify_nonce($_REQUEST['_ajax_nonce'], 'bitforms_save')) {
            wp_send_json_error(__('Token expired', 'bitformpro'), 401);
        }

        $inputJSON = file_get_contents('php://input');
        $queryParams = json_decode($inputJSON);

        if (empty($queryParams->tokenDetails) || empty($queryParams->apiKey) || empty($queryParams->apiSecret)) {
            wp_send_json_error(__('Requested parameter is empty', 'bitformpro'), 400);
        }

        $token = self::tokenExpiryCheck($queryParams->tokenDetails, $queryParams->apiKey, $queryParams->apiSecret);
        if ($token->access_token !== $queryParams->tokenDetails->access_token) {
            self::saveRefreshedToken($queryParams->formID, $queryParams->id, $token);
        }

        $folders = self::getDropboxFoldersList($token->access_token);
        $data = [];
        if ($folders->entries) {
            foreach ($folders->entries as $folder) {
                $folder = (array)$folder;
                if ($folder['.tag'] == "folder") {
                    $data[] = (object) [
                        'name' => $folder['name'],
                        'lower_path' => $folder['path_lower'],
                    ];
                }
            }
        }

        $response['dropboxFoldersList'] = $data;
        $response['tokenDetails'] = $token;
        wp_send_json_success($response, 200);
    }

    public static function getDropboxFoldersList($token)
    {
        $headers = [
            'Content-Type' => 'application/json; charset=utf-8',
            'Authorization' => 'Bearer ' . $token,
        ];
        $options = [
            'path'  => '',
            'recursive' => true,
            'include_deleted' => false,
            'include_mounted_folders' => true,
            'include_non_downloadable_files' => true
        ];
        $options = json_encode($options);

        $recipientApiEndpoint = self::$apiBaseUri . '/2/files/list_folder';
        $apiResponse = HttpHelper::post($recipientApiEndpoint, $options, $headers);
        if (is_wp_error($apiResponse) || !empty($apiResponse->error)) {
            return false;
        }
        return $apiResponse;
    }

    private static function tokenExpiryCheck($token, $apiKey, $apiSecret)
    {
        if (!$token) {
            return false;
        }

        if (($token->generates_on + $token->expires_in - 30) < time()) {
            $refreshToken = self::refreshToken($token->refresh_token, $apiKey, $apiSecret);
            if (is_wp_error($refreshToken) || !empty($refreshToken->error)) {
                return false;
            }

            $token->access_token = $refreshToken->access_token;
            $token->expires_in = $refreshToken->expires_in;
            $token->generates_on = $refreshToken->generates_on;
        }
        return $token;
    }

    private static function refreshToken($refresh_token, $apiKey, $apiSecret)
    {
        $body = [
            'grant_type' => 'refresh_token',
            'client_id' => $apiKey,
            'client_secret' => $apiSecret,
            'refresh_token' => $refresh_token,
        ];

        $apiEndpoint = self::$apiBaseUri . '/oauth2/token';
        $apiResponse = HttpHelper::post($apiEndpoint, $body);
        if (is_wp_error($apiResponse) || !empty($apiResponse->error)) {
            return false;
        }
        $token = $apiResponse;
        $token->generates_on = \time();
        return $token;
    }

    private static function saveRefreshedToken($formID, $integrationID, $tokenDetails)
    {
        if (empty($formID) || empty($integrationID)) {
            return;
        }

        $integrationHandler = new IntegrationHandler($formID, IpTool::getUserDetail());
        $dropboxDetails = $integrationHandler->getAIntegration($integrationID);
        if (is_wp_error($dropboxDetails)) {
            return;
        }

        $newDetails = json_decode($dropboxDetails[0]->integration_details);
        $newDetails->tokenDetails = $tokenDetails;
        $integrationHandler->updateIntegration($integrationID, $dropboxDetails[0]->integration_name, 'Dropbox', \json_encode($newDetails), 'form');
    }

    public function execute(IntegrationHandler $integrationHandler, $integrationData, $fieldValues, $entryID, $logID)
    {
        $integrationDetails = json_decode($integrationData->integration_details);

        if (empty($integrationDetails->tokenDetails->access_token)) {
            (new ApiResponse())->apiResponse($logID, $this->integrationID, ['type' =>  'record', 'type_name' => 'insert'], 'error', 'Not Authorization By Dropbox.');
            return;
        }

        $actions = $integrationDetails->actions;
        $fieldMap = $integrationDetails->field_map;
        $tokenDetails = self::tokenExpiryCheck($integrationDetails->tokenDetails, $integrationDetails->apiKey, $integrationDetails->apiSecret);
        if ($tokenDetails->access_token !== $integrationDetails->tokenDetails->access_token) {
            self::saveRefreshedToken($this->formID, $this->integrationID, $tokenDetails);
        }

        if (empty($fieldMap)) {
            return new WP_Error('REQ_FIELD_EMPTY', __('Required data not found.', 'bitformpro'));
        }

        $dropboxResponse = (new DropboxRecordApiHelper($tokenDetails->access_token, $this->formID, $entryID))->executeRecordApi($this->integrationID, $logID, $fieldValues, $fieldMap, $actions);
        if (is_wp_error($dropboxResponse)) {
            return $dropboxResponse;
        }
        return $dropboxResponse;
    }
}
