<?php defined('BX_DOL') or die('hack attempt');
/**
 * Copyright (c) UNA, Inc - https://una.io
 * MIT License - https://opensource.org/licenses/MIT
 *
 * @defgroup    UnaCore UNA Core
 * @{
 */

/*
 * Login for Owner/Collaborator account:
 * https://admin.shopify.com/store/your_shop/
 * 
 * Integration:
 * 0. Custom apps creation guide (for a shop Owner/Collaborator, not a Partner):
 * https://help.shopify.com/en/manual/apps/app-types/custom-apps
 * 
 * 1. Make authenticated requests to the REST Admin API:
 * https://shopify.dev/docs/apps/auth/admin-app-access-tokens
 * 
 * 2. REST Admin API reference:
 * https://shopify.dev/docs/api/admin-rest
 * 
 * 3. REST Admin API -> Product
 * https://shopify.dev/docs/api/admin-rest/2023-10/resources/product
 * 
 * 4. REST Admin API -> Order
 * https://shopify.dev/docs/api/admin-rest/2023-10/resources/order
 * 
 */
class BxDolAIProviderShopifyAdmin extends BxDolAIProvider
{
    public static $PROVIDER_NAME = 'shopify_admin';

    protected $_sShopDomain;
    protected $_sAccessToken;

    protected $_sEndpoint;
    protected $_sStorefront;

    public function __construct($aProvider)
    {
        $this->_sProviderName = self::$PROVIDER_NAME;

        parent::__construct($aProvider);

        $this->_sShopDomain = $this->getOption('shop_domain');
        $this->_sAccessToken = $this->getOption('access_token');

        $this->_sEndpoint = "https://{$this->_sShopDomain}/admin/api/2023-10/";
        $this->_sStorefront = "https://{$this->_sShopDomain}/";
    }

    public function getEntry($sId)
    {
        $sProduct = $this->call('products/' . $sId . '.json', [
            'fields' => 'id,title,handle,body_html,tags,variants',
        ], 'get');
        
        if(empty($sProduct))
            return [];

        $aProduct = json_decode($sProduct, true);
        if(empty($aProduct) || !is_array($aProduct) || empty($aProduct['product']))
            return [];

        return $aProduct['product'];
    }

    public function getOptionWebhookUrl()
    {
        return bx_append_url_params(BX_DOL_URL_ROOT . 'agents.php', [
            'p' => $this->_iId,
            'a' => 'webhook'
        ]);
    }

    public function processActionWebhook()
    {
        $sData = @file_get_contents('php://input');

        $this->_log(json_decode($sData, true));

        $sHmacHeader = isset($_SERVER['HTTP_X_SHOPIFY_HMAC_SHA256']) ? $_SERVER['HTTP_X_SHOPIFY_HMAC_SHA256'] : '';
        if(!$this->_verifyWebhook($sData, $sHmacHeader)) {
            http_response_code(401);
            return;
        }

        $oAi = BxDolAI::getInstance();

        $aAutomators = $oAi->getAutomatorsWebhook($this->_iId);
        foreach($aAutomators as $aAutomator)
            $oAi->callAutomator(BX_DOL_AI_AUTOMATOR_WEBHOOK, [
                'automator' => $aAutomator
            ]);

        http_response_code(200);
    }

    public function call($sRequest, $aParams, $sMethod = 'post-json', $aHeaders = [])
    {
        $aHeaders[] = 'Content-Type: application/json';
        if(!empty($this->_sAccessToken))
            $aHeaders[] = 'X-Shopify-Access-Token: ' . $this->_sAccessToken;
        else
            $aHeaders[] = 'Authorization: Basic ' . base64_encode($this->_sApiKey . ':' . $this->_sApiSecretKey);

        $sResponse = bx_file_get_contents($this->_sEndpoint . $sRequest, $aParams, $sMethod, $aHeaders);
        if(empty($sResponse))
            return false;
        
        $aResponse = json_decode($sResponse, true);
        if(empty($aResponse) || !is_array($aResponse))
            return false;

        return $aResponse;
    }

    /**
     * Internal methods.
     */    
    protected function _dateI2S($iTimestamp)
    {
        return date("Y-m-d", $iTimestamp);
    }

    protected function _verifyWebhook($sData, $sHmacHeader)
    {
        $sHmacCalc = base64_encode(hash_hmac('sha256', $sData, $this->getOption('secret_key'), true));
        return hash_equals($sHmacCalc, $sHmacHeader);
    }
}