<?php

/**
 * Class MailChimp_WooCommerce_MailChimpApi
 */
class MailChimp_WooCommerce_MailChimpApi
{
    protected $version = '3.0';
    protected $data_center = 'us2';
    protected $api_key = null;
    protected $auth_type = 'key';

    protected static $instance = null;

    /**
     * @return null|MailChimp_WooCommerce_MailChimpApi
     */
    public static function getInstance()
    {
        return static::$instance;
    }

    /**
     * @param $api_key
     * @return MailChimp_WooCommerce_MailChimpApi
     */
    public static function constructInstance($api_key)
    {
        return static::$instance = new MailChimp_WooCommerce_MailChimpApi($api_key);
    }

    /**
     * MailChimpService constructor.
     * @param null $api_key
     */
    public function __construct($api_key = null)
    {
        if (!empty($api_key)) {
            $this->setApiKey($api_key);
        }
    }

    /**
     * @param $key
     * @return $this
     */
    public function setApiKey($key)
    {
        $parts = str_getcsv($key, '-');

        if (count($parts) == 2) {
            $this->data_center = $parts[1];
        }

        $this->api_key = $parts[0];

        return $this;
    }

    /**
     * @param $dc
     * @return $this
     */
    public function setDataCenter($dc)
    {
        $this->data_center = $dc;

        return $this;
    }

    /**
     * @param $version
     * @return $this
     */
    public function setVersion($version)
    {
        $this->version = $version;

        return $this;
    }

    /**
     * @param bool $return_profile
     * @param bool $throw_error
     * @return array|bool|mixed|null|object
     * @throws Exception
     */
    public function ping($return_profile = false, $throw_error = false)
    {
        try {
            $profile = $this->get('/');
            return $return_profile ? $profile : true;
        } catch (MailChimp_WooCommerce_Error $e) {
            if ($throw_error) {
                throw $e;
            }
            return false;
        }
    }

    /**
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function getProfile()
    {
        return $this->get('/');
    }

    /**
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function getAuthorizedApps()
    {
        return $this->get('authorized-apps');
    }

    /**
     * @param $id
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function getAuthorizedAppDetails($id)
    {
        return $this->get("authorized-apps/$id");
    }

    /**
     * @param $client_id
     * @param $client_secret
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function linkAuthorizedApp($client_id, $client_secret)
    {
        return $this->post('authorized-apps', array('client_id' => $client_id, 'client_secret' => $client_secret));
    }

    /**
     * @param $list_id
     * @param $email
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function member($list_id, $email)
    {
        $hash = md5(strtolower(trim($email)));
        return $this->get("lists/$list_id/members/$hash", array());
    }

    /**
     * @param $list_id
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function members($list_id)
    {
        return $this->get("lists/$list_id/members");
    }

    /**
     * @param $list_id
     * @param $email
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function deleteMember($list_id, $email)
    {
        $hash = md5(strtolower(trim($email)));
        return (bool) $this->delete("lists/$list_id/members/$hash", array());
    }

    /**
     * @param $list_id
     * @param $email
     * @param bool $subscribed
     * @param array $merge_fields
     * @param array $list_interests
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function subscribe($list_id, $email, $subscribed = true, $merge_fields = array(), $list_interests = array(), $language = null, $gdpr_fields = null)
    {
        if (is_string($subscribed)) {
            $status = $subscribed;
        } else {
            if ($subscribed === true) {
                $status = 'subscribed';
            } elseif ($subscribed === false) {
                $status = 'pending';
            } else {
                $status = 'transactional';
            }
        }
        $data = array(
            'email_type' => 'html',
            'email_address' => $email,
            'status' => $status,
            'merge_fields' => $merge_fields,
            'interests' => $list_interests,
            'language' => $language,
            'marketing_permissions' => $gdpr_fields,
        );

        if (empty($data['merge_fields'])) {
            unset($data['merge_fields']);
        }

        if (empty($data['interests'])) {
            unset($data['interests']);
        }
        
        if (empty($data['language'])) {
            unset($data['language']);
        }
        
        if (empty($data['marketing_permissions'])) {
            unset($data['marketing_permissions']);
        }

        mailchimp_debug('api.subscribe', "Subscribing {$email}", $data);

        return $this->post("lists/$list_id/members?skip_merge_validation=true", $data);
    }

    /**
     * @param $list_id
     * @param $email
     * @param bool $subscribed
     * @param array $merge_fields
     * @param array $list_interests
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     */
    public function update($list_id, $email, $subscribed = true, $merge_fields = array(), $list_interests = array(), $language = null, $gdpr_fields = null)
    {
        $hash = md5(strtolower(trim($email)));

        if ($subscribed === true) {
            $status = 'subscribed';
        } elseif ($subscribed === false) {
            $status = 'unsubscribed';
        } elseif ($subscribed === null) {
            $status = 'cleaned';
        } else {
            $status = $subscribed;
        }

        $data = array(
            'email_address' => $email,
            'status' => $status,
            'merge_fields' => $merge_fields,
            'interests' => $list_interests,
            'language' => $language,
            'marketing_permissions' => $gdpr_fields,
        );

        if (empty($data['merge_fields'])) {
            unset($data['merge_fields']);
        }

        if (empty($data['interests'])) {
            unset($data['interests']);
        }

        if (empty($data['language'])) {
            unset($data['language']);
        }

        if (empty($data['marketing_permissions'])) {
            unset($data['marketing_permissions']);
        }

        mailchimp_debug('api.update_member', "Updating {$email}", $data);

        return $this->patch("lists/$list_id/members/$hash?skip_merge_validation=true", $data);
    }

    /**
     * @param $list_id
     * @return mixed
     * @throws \Throwable
     */
    public function getSubscribedCount($list_id)
    {
        if (empty($list_id)) {
            return 0;
        }
        return $this->get("lists/{$list_id}/members?status=subscribed&count=1")['total_items'];
    }

    /**
     * @param $list_id
     * @return mixed
     * @throws \Throwable
     */
    public function getUnsubscribedCount($list_id)
    {
        if (empty($list_id)) {
            return 0;
        }
        return $this->get("lists/{$list_id}/members?status=unsubscribed&count=1")['total_items'];
    }

    /**
     * @param $list_id
     * @return mixed
     * @throws \Throwable
     */
    public function getTransactionalCount($list_id)
    {
        if (empty($list_id)) {
            return 0;
        }
        return $this->get("lists/{$list_id}/members?status=transactional&count=1")['total_items'];
    }


    /**
     * @param $list_id
     * @param $email
     * @param bool $fail_silently
     * @param MailChimp_WooCommerce_Order $order
     * @return array|bool|mixed|object|null
     * @throws MailChimp_WooCommerce_Error|\Exception
     */
    public function updateMemberTags($list_id, $email, $fail_silently = false, $order = null)
    {
        $hash = md5(strtolower(trim($email)));
        $tags = mailchimp_get_user_tags_to_update($email, $order);

        if (empty($tags)) return false;

        $data = array(
            'tags' => $tags
        );

        mailchimp_debug('api.update_member_tags', "Updating {$email}", $data);

        try {
            return $this->post("lists/$list_id/members/$hash/tags", $data);
        } catch (\Exception $e) {
            if (!$fail_silently) throw $e;
        }

        return false;
    }

    /**
     * @param $list_id
     * @param $email
     * @param bool $subscribed
     * @param array $merge_fields
     * @param array $list_interests
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function updateOrCreate($list_id, $email, $subscribed = true, $merge_fields = array(), $list_interests = array(), $language = null)
    {
        $hash = md5(strtolower(trim($email)));

        if ($subscribed === true) {
            $status = 'subscribed';
            $status_if_new = 'subscribed';
        } elseif ($subscribed === false) {
            $status = 'unsubscribed';
            $status_if_new = 'pending';
        } elseif ($subscribed === null) {
            $status = 'cleaned';
            $status_if_new = 'subscribed';
        } else {
            $status = $subscribed;
            $status_if_new = 'pending';
        }

        $data = array(
            'email_address' => $email,
            'status' => $status,
            'status_if_new' => $status_if_new,
            'merge_fields' => $merge_fields,
            'interests' => $list_interests,
            'language' => $language
        );

        if (empty($data['merge_fields'])) {
            unset($data['merge_fields']);
        }

        if (empty($data['interests'])) {
            unset($data['interests']);
        }
        
        if (empty($data['language'])) {
            unset($data['language']);
        }
        
        mailchimp_debug('api.update_or_create', "Update Or Create {$email}", $data);

        return $this->put("lists/$list_id/members/$hash", $data);
    }

    /**
     * @param MailChimp_WooCommerce_CreateListSubmission $submission
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function createList(MailChimp_WooCommerce_CreateListSubmission $submission)
    {
        return $this->post('lists', $submission->getSubmission());
    }

    /**
     * @param string $list_id
     * @param MailChimp_WooCommerce_CreateListSubmission $submission
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function updateList($list_id, MailChimp_WooCommerce_CreateListSubmission $submission)
    {
        return $this->patch("lists/{$list_id}", $submission->getSubmission());
    }

    /**
     * @param bool $as_list
     * @param int $count
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function getLists($as_list = false, $count = 100)
    {
        $result = $this->get('lists', array('count' => $count));

        if (!is_array($result)) {
            throw new MailChimp_WooCommerce_RateLimitError('getting lists api failure, retry again.');
        }

        if ($as_list) {
            $lists = array();
            if ($result) {
                $result = (object)$result;
                if (isset($result->lists) && is_array($result->lists)) {
                    foreach ($result->lists as $list) {
                        $list = (object)$list;
                        $lists[$list->id] = $list->name;
                    }
                }
            }

            return $lists;
        }

        return $result;
    }

    /**
     * @param $id
     * @return bool
     */
    public function hasList($id)
    {
        try {
            return (bool) $this->getList($id);
        } catch (\Exception $e) {
            return false;
        }
    }

    /**
     * @param $id
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function getList($id)
    {
        $result = $this->get('lists/' . $id);
        if (!is_array($result)) {
            throw new MailChimp_WooCommerce_RateLimitError('getting list api failure, retry again.');
        }
        return $result;
    }

    /**
     * @param $id
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function deleteList($id)
    {
        return (bool) $this->delete('lists/'.$id);
    }

    /**
     * @return array|mixed
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function getListsWithMergeFields()
    {
        $lists = $this->getLists(true);

        foreach ($lists as $id => $name) {
            $lists[$id] = $this->mergeFields($id, 100);
        }

        return $lists;
    }

    /**
     * @param $list_id
     * @param int $count
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function mergeFields($list_id, $count = 10)
    {
        $result = $this->get("lists/$list_id/merge-fields", array('count' => $count,));

        if (!is_array($result)) {
            throw new MailChimp_WooCommerce_RateLimitError('getting merge field api failure, retry again.');
        }

        return $result;
    }

    /**
     * @param $list_id
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function getInterestGroups($list_id)
    {
        if (empty($list_id)) {
            return array();
        }
        $result = $this->get("lists/$list_id/interest-categories");

        return $result;
    }

    /**
     * @param $list_id
     * @param $group_id
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function getInterestGroupOptions($list_id, $group_id)
    {
        if (empty($list_id) || empty($group_id)) {
            return array();
        }
        $result = $this->get("lists/$list_id/interest-categories/$group_id/interests");

        return $result;
    }

    /**
     * @param $store_id
     * @param int $page
     * @param int $count
     * @param DateTime|null $since
     * @param null $campaign_id
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function orders($store_id, $page = 1, $count = 10, \DateTime $since = null, $campaign_id = null)
    {
        $result = $this->get('ecommerce/stores/'.$store_id.'/orders', array(
            'start' => $page,
            'count' => $count,
            'offset' => ($page * $count),
            'since' => ($since ? $since->format('Y-m-d H:i:s') : null),
            'cid' => $campaign_id,
        ));

        return $result;
    }

    /**
     * @param $store_id
     * @return int|mixed
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function getOrderCount($store_id)
    {
        $data = $this->get("ecommerce/stores/{$store_id}/orders?count=1");
        if (!is_array($data)) {
            return 0;
        }
        return $data['total_items'];
    }

    /**
     * @param $store_id
     * @param bool $throw
     * @return bool|MailChimp_WooCommerce_Store
     * @throws MailChimp_WooCommerce_Error
     */
    public function getStore($store_id, $throw = false)
    {
        try {
            $data = $this->get("ecommerce/stores/$store_id");
            if (!is_array($data)) {
                throw new MailChimp_WooCommerce_RateLimitError('getting store api failure, retry again.');
            }
            if (!isset($data['id']) || !isset($data['name'])) {
                return false;
            }
            $store = new MailChimp_WooCommerce_Store();
            return $store->fromArray($data);
        } catch (MailChimp_WooCommerce_Error $e) {
            if ($throw) throw $e;
            return false;
        } catch (\Exception $e) {
            if ($throw) throw $e;
            return false;
        }
    }

    /**
     * @param $campaign_id
     * @param bool $throw_if_invalid
     * @return array|bool|mixed|object|null
     * @throws Exception
     */
    public function getCampaign($campaign_id, $throw_if_invalid = true)
    {
        // don't let an empty campaign ID do anything
        if (empty($campaign_id)) return false;

        // if we found the campaign ID already and it's been stored in the cache, return it from the cache instead.
        if (($data = get_site_transient('mailchimp-woocommerce-has-campaign-id-'.$campaign_id)) && !empty($data)) {
            return $data;
        }
        if (get_site_transient('mailchimp-woocommerce-no-campaign-id-'.$campaign_id)) {
            return false;
        }
        try {
            $data = $this->get("campaigns/$campaign_id");
            delete_site_transient('mailchimp-woocommerce-no-campaign-id-'.$campaign_id);
            set_site_transient('mailchimp-woocommerce-has-campaign-id-'.$campaign_id, $data, 60 * 30);
            return $data;
        } catch (\Exception $e) {
            mailchimp_debug('campaign_get.error', 'No campaign with provided ID: '. $campaign_id. ' :: '. $e->getMessage(). ' :: in '.$e->getFile().' :: on '.$e->getLine());
            set_site_transient('mailchimp-woocommerce-no-campaign-id-'.$campaign_id, true, 60 * 30);

            if (!$throw_if_invalid) {
                return false;
            }
            throw $e;
        }
    }

    /**
     * @param $store_id
     * @return array|bool
     */
    public function checkConnectedSite($store_id)
    {
        try {
             return $this->get("connected-sites/{$store_id}");
        } catch (MailChimp_WooCommerce_Error $e) {
            return false;
        } catch (\Exception $e) {
            return false;
        }
    }

    /**
     * @param $store_id
     * @return array|bool|mixed|null|object
     */
    public function connectSite($store_id)
    {
        try {
            return $this->post("connected-sites/{$store_id}/actions/verify-script-installation", array());
        } catch (MailChimp_WooCommerce_Error $e) {
            return false;
        } catch (\Exception $e) {
            return false;
        }
    }

    /**
     * @return array|bool
     */
    public function stores()
    {
        try {
            $data = $this->get("ecommerce/stores", array('count' => 1000));

            if (!isset($data['stores']) || empty($data['stores']) || !is_array($data['stores'])) {
                return array();
            }

            $response = array();

            foreach ($data['stores'] as $store_data) {
                $store = new MailChimp_WooCommerce_Store();
                $response[] = $store->fromArray($store_data);
            }

            return $response;
        } catch (MailChimp_WooCommerce_Error $e) {
            return false;
        } catch (\Exception $e) {
            return false;
        }
    }

    /**
     * @param $store_id
     * @param $is_syncing
     * @return array|bool|mixed|null|object
     */
    public function flagStoreSync($store_id, $is_syncing)
    {
        try {
            // pull the store to make sure we have one.
            if (!($store = $this->getStore($store_id))) {
                return false;
            }

            // flag it as ^^^ is_syncing ^^^
            $store->flagSyncing($is_syncing);

            // patch the store data
            return $this->patch("ecommerce/stores/{$store_id}", $store->toArray());

        } catch (\Exception $e) {
            mailchimp_log('flag.store_sync', $e->getMessage(). ' :: in '.$e->getFile().' :: on '.$e->getLine());
        }
        return false;
    }

    /**
     * @param MailChimp_WooCommerce_Store $store
     * @param bool $silent
     * @return bool|MailChimp_WooCommerce_Store
     * @throws Exception
     */
    public function addStore(MailChimp_WooCommerce_Store $store, $silent = true)
    {
        try {
            $this->validateStoreSubmission($store);
            $data = $this->post("ecommerce/stores", $store->toArray());
            $store = new MailChimp_WooCommerce_Store();
            return $store->fromArray($data);
        } catch (\Exception $e) {
            if (!$silent) throw $e;
            return false;
        }
    }

    /**
     * @param MailChimp_WooCommerce_Store $store
     * @param bool $silent
     * @return bool|MailChimp_WooCommerce_Store
     * @throws Exception
     */
    public function updateStore(MailChimp_WooCommerce_Store $store, $silent = true)
    {
        try {
            $this->validateStoreSubmission($store);
            $data = $this->patch("ecommerce/stores/{$store->getId()}", $store->toArray());
            $store = new MailChimp_WooCommerce_Store();
            return $store->fromArray($data);
        } catch (\Exception $e) {
            if (!$silent) throw $e;
            return false;
        }
    }

    /**
     * @param $store_id
     * @return bool
     */
    public function deleteStore($store_id)
    {
        try {
            return (bool) $this->delete("ecommerce/stores/$store_id");
        } catch (MailChimp_WooCommerce_Error $e) {
            mailchimp_error("delete_store {$store_id}", $e->getMessage());
            return false;
        } catch (\Exception $e) {
            mailchimp_error("delete_store {$store_id}", $e->getMessage());
            return false;
        }
    }

    /**
     * @param $store_id
     * @param $customer_id
     * @param boolean $throw
     * @return bool|MailChimp_WooCommerce_Customer
     * @throws Exception
     */
    public function getCustomer($store_id, $customer_id, $throw = false)
    {
        try {
            $data = $this->get("ecommerce/stores/$store_id/customers/$customer_id");
            if (!is_array($data)) {
                throw new MailChimp_WooCommerce_RateLimitError('getting customer api failure, retry again.');
            }
            $customer = new MailChimp_WooCommerce_Customer();
            return $customer->fromArray($data);
        } catch (MailChimp_WooCommerce_Error $e) {
            if ($throw) throw $e;
            return false;
        }
    }

    /**
     * @param MailChimp_WooCommerce_Customer $customer
     * @return bool|MailChimp_WooCommerce_Customer
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function addCustomer(MailChimp_WooCommerce_Customer $customer)
    {
        if (!($this->validateStoreSubmission($customer))) {
            return false;
        }
        $data = $this->post("ecommerce/stores", $customer->toArray());
        if (!is_array($data)) {
            throw new MailChimp_WooCommerce_RateLimitError('adding customer api failure, retry again.');
        }
        $customer = new MailChimp_WooCommerce_Customer();
        return $customer->fromArray($data);
    }

    /**
     * @param $store_id
     * @param int $page
     * @param int $count
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function carts($store_id, $page = 1, $count = 10)
    {
        $result = $this->get('ecommerce/stores/'.$store_id.'/carts', array(
            'start' => $page,
            'count' => $count,
            'offset' => ($page * $count),
        ));

        return $result;
    }

    /**
     * @param $store_id
     * @param MailChimp_WooCommerce_Cart $cart
     * @param bool $silent
     * @return bool|MailChimp_WooCommerce_Cart
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     */
    public function addCart($store_id, MailChimp_WooCommerce_Cart $cart, $silent = true)
    {
        try {
            $email = $cart->getCustomer()->getEmailAddress();

            if (mailchimp_email_is_privacy_protected($email) || mailchimp_email_is_amazon($email)) {
                return false;
            }

            mailchimp_debug('api.addCart', "Adding Cart :: {$email}", $data = $cart->toArray());

            $data = $this->post("ecommerce/stores/$store_id/carts", $data);
            $cart = new MailChimp_WooCommerce_Cart();
            return $cart->setStoreID($store_id)->fromArray($data);
        } catch (MailChimp_WooCommerce_Error $e) {
            if (!$silent) throw $e;
            mailchimp_log('api.addCart', $e->getMessage());
            return false;
        } catch (\Exception $e) {
            if (!$silent) throw $e;
            return false;
        }
    }

    /**
     * @param $store_id
     * @param MailChimp_WooCommerce_Cart $cart
     * @param bool $silent
     * @return bool|MailChimp_WooCommerce_Cart
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     */
    public function updateCart($store_id, MailChimp_WooCommerce_Cart $cart, $silent = true)
    {
        try {
            $email = $cart->getCustomer()->getEmailAddress();

            if (mailchimp_email_is_privacy_protected($email) || mailchimp_email_is_amazon($email)) {
                return false;
            }

            mailchimp_debug('api.updateCart', "Updating Cart :: {$email}", $data = $cart->toArrayForUpdate());

            $data = $this->patch("ecommerce/stores/$store_id/carts/{$cart->getId()}", $data);
            $cart = new MailChimp_WooCommerce_Cart();
            return $cart->setStoreID($store_id)->fromArray($data);
        } catch (MailChimp_WooCommerce_Error $e) {
            if (!$silent) throw $e;
            mailchimp_log('api.updateCart', $e->getMessage());
            return false;
        } catch (\Exception $e) {
            if (!$silent) throw $e;
            return false;
        }
    }

    /**
     * @param $store_id
     * @param $id
     * @return bool|MailChimp_WooCommerce_Cart
     */
    public function getCart($store_id, $id)
    {
        try {
            $data = $this->get("ecommerce/stores/$store_id/carts/$id");
            $cart = new MailChimp_WooCommerce_Cart();
            return $cart->setStoreID($store_id)->fromArray($data);
        } catch (MailChimp_WooCommerce_Error $e) {
            return false;
        } catch (\Exception $e) {
            return false;
        }
    }

    /**
     * @param $store_id
     * @param $id
     * @return bool
     */
    public function deleteCartByID($store_id, $id)
    {
        try {
            return (bool) $this->delete("ecommerce/stores/$store_id/carts/$id");
        } catch (MailChimp_WooCommerce_Error $e) {
            return false;
        } catch (\Exception $e) {
            return false;
        }
    }

    /**
     * @param $store_id
     * @param MailChimp_WooCommerce_Customer $customer
     * @param bool $silent
     * @return bool|MailChimp_WooCommerce_Customer
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     */
    public function updateCustomer($store_id, MailChimp_WooCommerce_Customer $customer, $silent = true)
    {
        try {
            if (!$this->validateStoreSubmission($customer)) {
                return false;
            }
            $data = $this->patch("ecommerce/stores/$store_id/customers/{$customer->getId()}", $customer->toArray());
            $customer = new MailChimp_WooCommerce_Customer();
            return $customer->fromArray($data);
        } catch (MailChimp_WooCommerce_Error $e) {
            if (!$silent) throw $e;
            return false;
        }
    }

    /**
     * @param $store_id
     * @param $customer_id
     * @return bool
     * @throws Exception
     */
    public function deleteCustomer($store_id, $customer_id)
    {
        try {
            return (bool) $this->delete("ecommerce/stores/$store_id/customers/$customer_id");
        } catch (MailChimp_WooCommerce_Error $e) {
            return false;
        }
    }

    /**
     * @param $store_id
     * @param MailChimp_WooCommerce_Order $order
     * @param bool $silent
     * @return bool|MailChimp_WooCommerce_Order
     * @throws Exception
     */
    public function addStoreOrder($store_id, MailChimp_WooCommerce_Order $order, $silent = true)
    {
        try {
            if (!$this->validateStoreSubmission($order)) {
                return false;
            }

            // submit the first one
            $data = $this->post("ecommerce/stores/$store_id/orders", $order->toArray());

            $email_address = $order->getCustomer()->getEmailAddress();

            // if the order is in pending status, we need to submit the order again with a paid status.
            if ($order->shouldConfirmAndPay() && $order->getFinancialStatus() !== 'paid') {
                $order->setFinancialStatus('paid');
                $data = $this->patch("ecommerce/stores/{$store_id}/orders/{$order->getId()}", $order->toArray());
            }

            // update the member tags but fail silently just in case.
            $this->updateMemberTags(mailchimp_get_list_id(), $email_address, true, $order);

            update_option('mailchimp-woocommerce-resource-last-updated', time());
            $order = new MailChimp_WooCommerce_Order();
            return $order->fromArray($data);
        } catch (\Exception $e) {
            if (!$silent) throw $e;
            mailchimp_log('api.add_order.error', $e->getMessage(), array('submission' => $order->toArray()));
            return false;
        }
    }

    /**
     * @param $store_id
     * @param MailChimp_WooCommerce_Order $order
     * @param bool $silent
     * @return bool|MailChimp_WooCommerce_Order
     * @throws Exception
     */
    public function updateStoreOrder($store_id, MailChimp_WooCommerce_Order $order, $silent = true)
    {
        try {
            if (!$this->validateStoreSubmission($order)) {
                return false;
            }
            $order_id = $order->getId();
            $data = $this->patch("ecommerce/stores/{$store_id}/orders/{$order_id}", $order->toArray());

            //update user tags
            $email_address = $order->getCustomer()->getEmailAddress();

            // if products list differs, we should remove the old products and add new ones
            $data_lines = $data['lines'];
            $order_lines = $order->getLinesIds();
            foreach ($data_lines as $line) {
                if (!in_array($line['id'], $order_lines)) {
                    $this->deleteStoreOrderLine($store_id, $order_id, $line['id']);
                }
            }

            // if the order is in pending status, we need to submit the order again with a paid status.
            if ($order->shouldConfirmAndPay() && $order->getFinancialStatus() !== 'paid') {
                $order->setFinancialStatus('paid');
                $data = $this->patch("ecommerce/stores/{$store_id}/orders/{$order_id}", $order->toArray());
            }

            // update the member tags but fail silently just in case.
            $this->updateMemberTags(mailchimp_get_list_id(), $email_address, true, $order);

            $order = new MailChimp_WooCommerce_Order();
            return $order->fromArray($data);
        } catch (\Exception $e) {
            if (!$silent) throw $e;
            mailchimp_log('api.update_order.error', $e->getMessage(), array('submission' => $order->toArray()));
            return false;
        }
    }

    /**
     * @param $store_id
     * @param $order_id
     * @param boolean $throw
     * @return bool|MailChimp_WooCommerce_Order
     * @throws Exception
     */
    public function getStoreOrder($store_id, $order_id, $throw = false)
    {
        try {
            $data = $this->get("ecommerce/stores/$store_id/orders/$order_id");
            if (!is_array($data)) {
                throw new MailChimp_WooCommerce_RateLimitError('getting order api failure, retry again.');
            }
            $order = new MailChimp_WooCommerce_Order();
            return $order->fromArray($data);
        } catch (MailChimp_WooCommerce_Error $e) {
            if ($throw) throw $e;
            return false;
        }
    }

    /**
     * @param $store_id
     * @param $order_id
     * @return bool
     * @throws Exception
     */
    public function deleteStoreOrder($store_id, $order_id)
    {
        try {
            return (bool) $this->delete("ecommerce/stores/$store_id/orders/$order_id");
        } catch (MailChimp_WooCommerce_Error $e) {
            return false;
        }
    }

     /**
     * @param $store_id
     * @param $order_id
     * @param $line_id
     * @return bool
     * @throws Exception
     */
    public function deleteStoreOrderLine($store_id, $order_id, $line_id)
    {
        try {
            return (bool) $this->delete("ecommerce/stores/{$store_id}/orders/{$order_id}/lines/{$line_id}");
        } catch (MailChimp_WooCommerce_Error $e) {
            return false;
        }
    }

    /**
     * @param $store_id
     * @param $product_id
     * @param boolean $throw
     * @return bool|MailChimp_WooCommerce_Product
     * @throws Exception
     */
    public function getStoreProduct($store_id, $product_id, $throw = false)
    {
        try {
            $data = $this->get("ecommerce/stores/$store_id/products/$product_id");
            if (!is_array($data)) {
                throw new MailChimp_WooCommerce_RateLimitError('getting product api failure, retry again.');
            }
            $product = new MailChimp_WooCommerce_Product();
            return $product->fromArray($data);
        } catch (MailChimp_WooCommerce_Error $e) {
            if ($throw) throw $e;
            return false;
        }
    }

    /**
     * @param $store_id
     * @param int $page
     * @param int $count
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function products($store_id, $page = 1, $count = 10)
    {
        $result = $this->get('ecommerce/stores/'.$store_id.'/products', array(
            'start' => $page,
            'count' => $count,
            'offset' => ($page * $count),
        ));

        return $result;
    }

    /**
     * @param $store_id
     * @param MailChimp_WooCommerce_Product $product
     * @param bool $silent
     * @return bool|MailChimp_WooCommerce_Product
     * @throws Exception
     */
    public function addStoreProduct($store_id, MailChimp_WooCommerce_Product $product, $silent = true)
    {
        try {
            if (!$this->validateStoreSubmission($product)) {
                return false;
            }
            $data = $this->post("ecommerce/stores/$store_id/products", $product->toArray());
            update_option('mailchimp-woocommerce-resource-last-updated', time());
            $product = new MailChimp_WooCommerce_Product();
            return $product->fromArray($data);
        } catch (\Exception $e) {
            if (!$silent) throw $e;
            mailchimp_log('api.add_product.error', $e->getMessage(), array('submission' => $product->toArray()));
            return false;
        }
    }

    /**
     * @param $store_id
     * @param MailChimp_WooCommerce_Product $product
     * @param bool $silent
     * @return bool|MailChimp_WooCommerce_Product
     * @throws Exception
     */
    public function updateStoreProduct($store_id, MailChimp_WooCommerce_Product $product, $silent = true)
    {
        try {
            if (!$this->validateStoreSubmission($product)) {
                return false;
            }
            $data = $this->patch("ecommerce/stores/$store_id/products/{$product->getId()}", $product->toArray());
            update_option('mailchimp-woocommerce-resource-last-updated', time());
            $product = new MailChimp_WooCommerce_Product();
            return $product->fromArray($data);
        } catch (\Exception $e) {
            if (!$silent) throw $e;
            mailchimp_log('api.update_product.error', $e->getMessage(), array('submission' => $product->toArray()));
            return false;
        }
    }

    /**
     * @param MailChimp_WooCommerce_Order $order
     * @return array
     */
    public function handleProductsMissingFromAPI(MailChimp_WooCommerce_Order $order)
    {
        $missing_products = array();
        foreach ($order->items() as $order_item) {
            /** @var \MailChimp_WooCommerce_LineItem $order_item */
            // get the line item name from the order detail just in case we need that title for the product.
            $job = new MailChimp_WooCommerce_Single_Product($order_item->getProductId(), $order_item->getFallbackTitle());
            if ($missing_products[$order_item->getId()] = $job->createModeOnly()->fromOrderItem($order_item)->handle()) {
                mailchimp_debug("missing_products.fallback", "Product {$order_item->getId()} had to be re-pushed into Mailchimp");
            }
        }
        return $missing_products;
    }

    /**
     * @return MailChimp_WooCommerce_Product
     */
    public function createEmptyLineItemProductPlaceholder()
    {
        $product = new MailChimp_WooCommerce_Product();
        $product->setId('empty_line_item_placeholder');
        $product->setTitle('Empty Line Item Placeholder');
        $product->setVendor('deleted');

        $variation = new MailChimp_WooCommerce_ProductVariation();
        $variation->setId($product->getId());
        $variation->setTitle($product->getTitle());
        $variation->setInventoryQuantity(0);
        $variation->setVisibility('hidden');
        $variation->setPrice(1);

        $product->addVariant($variation);

        if ((bool) mailchimp_get_data('empty_line_item_placeholder', false)) {
            return $product;
        }

        $store_id = mailchimp_get_store_id();
        $api = mailchimp_get_api();

        try {
            $response = $api->addStoreProduct($store_id, $product);
            mailchimp_set_data('empty_line_item_placeholder', true, 'yes');
            return $response;
        } catch (\Exception $e) {
            return $product;
        }
    }

    /**
     * @param $store_id
     * @param $product_id
     * @return bool
     * @throws Exception
     */
    public function deleteStoreProduct($store_id, $product_id)
    {
        try {
            return (bool) $this->delete("ecommerce/stores/$store_id/products/$product_id");
        } catch (MailChimp_WooCommerce_Error $e) {
            return false;
        }
    }

    /**
     * @param $store_id
     * @param MailChimp_WooCommerce_PromoRule $rule
     * @param bool $throw
     * @return bool|MailChimp_WooCommerce_PromoRule
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     */
    public function addPromoRule($store_id, MailChimp_WooCommerce_PromoRule $rule, $throw = true)
    {
        try {
            if (($response = $this->updatePromoRule($store_id, $rule, false))) {
                return $response;
            }
            $data = $this->post("ecommerce/stores/{$store_id}/promo-rules", $rule->toArray());
            return (new MailChimp_WooCommerce_PromoRule)->fromArray($data);
        } catch (MailChimp_WooCommerce_Error $e) {
            if ($throw) throw $e;
            return false;
        }
    }

    /**
     * @param $store_id
     * @param MailChimp_WooCommerce_PromoRule $rule
     * @param bool $throw
     * @return bool|MailChimp_WooCommerce_PromoRule
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     */
    public function updatePromoRule($store_id, MailChimp_WooCommerce_PromoRule $rule, $throw = true)
    {
        try {
            $data = $this->patch("ecommerce/stores/{$store_id}/promo-rules/{$rule->getId()}", $rule->toArray());
            return (new MailChimp_WooCommerce_PromoRule)->fromArray($data);
        } catch (MailChimp_WooCommerce_Error $e) {
            if ($throw) throw $e;
            return false;
        }
    }

    /**
     * @param $store_id
     * @param $rule
     * @return bool
     * @throws Exception
     */
    public function deletePromoRule($store_id, $rule)
    {
        try {
            $id = $rule instanceof MailChimp_WooCommerce_PromoRule ? $rule->getId() : $rule;
            //print_r(array('id' => $id, 'store' => $store_id));die();
            return (bool) $this->delete("ecommerce/stores/{$store_id}/promo-rules/{$id}");
        } catch (MailChimp_WooCommerce_Error $e) {
            //\Log::error("MC::deletePromoRule :: {$rule->getId()} :: {$e->getMessage()} on {$e->getLine()} in {$e->getFile()}");
            return false;
        }
    }

    /**
     * @param $store_id
     * @param int $page
     * @param int $count
     * @return array
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function getPromoRuleIds($store_id, $page = 1, $count = 10)
    {
        $result = $this->get("ecommerce/stores/{$store_id}/promo-rules", [
            'start' => $page,
            'count' => $count,
            'offset' => $page > 1 ? (($page-1) * $count) : 0,
            'include' => 'id',
        ]);

        $ids = array();
        foreach ($result['promo_rules'] as $rule) {
            $id = (string) $rule['id'];
            $ids[$id] = $id;
        }
        return $ids;
    }

    /**
     * @param $store_id
     * @param int $page
     * @param int $count
     * @param bool $return_original
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function getPromoRules($store_id, $page = 1, $count = 10, $return_original = false)
    {
        $result = $this->get("ecommerce/stores/{$store_id}/promo-rules", [
            'start' => $page,
            'count' => $count,
            'offset' => $page > 1 ? (($page-1) * $count) : 0,
        ]);

        if ($return_original) {
            return $result;
        }

        $rules = array();
        foreach ($result['promo_rules'] as $rule_data) {
            $rule = new MailChimp_WooCommerce_PromoRule();
            $rule->fromArray($rule_data);
            $rules[] = $rule;
        }
        return $rules;
    }

    /**
     * @param $store_id
     * @param $rule_id
     * @param int $page
     * @param int $count
     * @param bool $return_original
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    public function getPromoCodesForRule($store_id, $rule_id, $page = 1, $count = 10, $return_original = false)
    {
        $result = $this->get("ecommerce/stores/{$store_id}/promo-rules/{$rule_id}/promo_codes", [
            'start' => $page,
            'count' => $count,
            'offset' => $page > 1 ? (($page-1) * $count) : 0,
        ]);

        if ($return_original) {
            return $result;
        }

        $rules = array();
        foreach ($result as $rule_data) {
            $rule = new MailChimp_WooCommerce_PromoCode();
            $rule->fromArray($rule_data);
            $rules[] = $rule;
        }
        return $rules;
    }

    /**
     * @param $store_id
     * @param $rule_id
     * @param $code_id
     * @return bool|MailChimp_WooCommerce_PromoCode
     * @throws Exception
     */
    public function getPromoCodeForRule($store_id, $rule_id, $code_id)
    {
        try {
            $data = $this->get("ecommerce/stores/{$store_id}/promo-rules/{$rule_id}/promo-codes/{$code_id}");
            return (new MailChimp_WooCommerce_PromoCode)->fromArray($data);
        } catch (MailChimp_WooCommerce_Error $e) {
            return false;
        }
    }

    /**
     * @param $store_id
     * @param MailChimp_WooCommerce_PromoRule $rule
     * @param MailChimp_WooCommerce_PromoCode $code
     * @param bool $throw
     * @return bool|MailChimp_WooCommerce_PromoCode
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     */
    public function addPromoCodeForRule($store_id, MailChimp_WooCommerce_PromoRule $rule, MailChimp_WooCommerce_PromoCode $code, $throw = true)
    {
        try {
            if (($result = $this->updatePromoCodeForRule($store_id, $rule, $code, false))) {
                return $result;
            }
            $data = $this->post("ecommerce/stores/{$store_id}/promo-rules/{$rule->getId()}/promo-codes", $code->toArray());
            return (new MailChimp_WooCommerce_PromoCode)->fromArray($data);
        } catch (MailChimp_WooCommerce_Error $e) {
            if ($throw) throw $e;
            return false;
        }
    }

    /**
     * @param $store_id
     * @param MailChimp_WooCommerce_PromoRule $rule
     * @param MailChimp_WooCommerce_PromoCode $code
     * @param bool $throw
     * @return bool|MailChimp_WooCommerce_PromoCode
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     */
    public function updatePromoCodeForRule($store_id, MailChimp_WooCommerce_PromoRule $rule, MailChimp_WooCommerce_PromoCode $code, $throw = true)
    {
        try {
            $data = $this->patch("ecommerce/stores/{$store_id}/promo-rules/{$rule->getId()}/promo-codes/{$code->getId()}", $code->toArray());
            return (new MailChimp_WooCommerce_PromoCode)->fromArray($data);
        } catch (MailChimp_WooCommerce_Error $e) {
            if ($throw) throw $e;
            return false;
        }
    }

    /**
     * @param $store_id
     * @param $rule_id
     * @param $code_id
     * @return bool
     */
    public function deletePromoCodeForRule($store_id, $rule_id, $code_id)
    {
        try {
            return (bool) $this->delete("ecommerce/stores/{$store_id}/promo-rules/{$rule_id}/promo-codes/{$code_id}");
        } catch (MailChimp_WooCommerce_Error $e) {
            return false;
        } catch (\Exception $e) {
            return false;
        }
    }

    /**
     * @param $target
     * @return bool
     */
    protected function validateStoreSubmission($target)
    {
        if ($target instanceof MailChimp_WooCommerce_Order) {
            return $this->validateStoreOrder($target);
        } else if ($target instanceof MailChimp_WooCommerce_Customer) {
            return $this->validateStoreCustomer($target);
        }
        return true;
    }

    /**
     * @param MailChimp_WooCommerce_Order $order
     * @return bool
     */
    protected function validateStoreOrder(MailChimp_WooCommerce_Order $order)
    {
        if (!$this->validateStoreCustomer($order->getCustomer())) {
            return false;
        }
        return true;
    }

    /**
     * @param MailChimp_WooCommerce_Customer $customer
     * @return bool
     */
    protected function validateStoreCustomer(MailChimp_WooCommerce_Customer $customer)
    {
        $email = $customer->getEmailAddress();

        if (!is_email($email) || mailchimp_email_is_amazon($email) || mailchimp_email_is_privacy_protected($email)) {
            return false;
        }

        return true;
    }

    /**
     * @param string $list_id
     * @param int $minutes
     * @return false|mixed
     */
    public function getCachedGDPRFields($list_id, $minutes = 5)
    {
        $transient = "mailchimp-woocommerce-gdpr-fields.{$list_id}";
        $GDPRfields = get_site_transient($transient);

        // only return the values if it's a false - or an array
        if (is_array($GDPRfields)) return $GDPRfields;

        try {
            $GDPRfields = $this->getGDPRFields($list_id);
            set_site_transient($transient, $GDPRfields, 60 * $minutes);
        } catch (\Exception $e) {
            $GDPRfields = array();
        }

        return $GDPRfields;
    }

     /**
     * @param 
     * @return 
     */
    public function getGDPRFields($list_id)
    {
        $one_member = $this->get("lists/$list_id/members?fields=members.marketing_permissions&count=1");
        $fields = false;
        
        if (is_array($one_member) &&
            isset($one_member['members']) &&
            isset($one_member['members'][0]) &&
            isset($one_member['members'][0]['marketing_permissions'])) {
            $fields = $one_member['members'][0]['marketing_permissions'];
        }
                
        return $fields;
    }

    /**
     * @param $url
     * @param null $params
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    protected function delete($url, $params = null)
    {
        $curl = curl_init();

        $options = $this->applyCurlOptions('DELETE', $url, $params);

        curl_setopt_array($curl, $options);

        return $this->processCurlResponse($curl);
    }

    /**
     * @param $url
     * @param null $params
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    protected function get($url, $params = null)
    {
        $curl = curl_init();

        $options = $this->applyCurlOptions('GET', $url, $params);

        curl_setopt_array($curl, $options);

        return $this->processCurlResponse($curl);
    }

    /**
     * @param $url
     * @param $body
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     */
    protected function patch($url, $body)
    {
        // process the patch request the normal way
        $curl = curl_init();

        $json = json_encode($body);

        $options = $this->applyCurlOptions('PATCH', $url, array(), array(
            'Expect:',
            'Content-Length: '.strlen($json),
        ));

        $options[CURLOPT_POSTFIELDS] = $json;

        curl_setopt_array($curl, $options);

        return $this->processCurlResponse($curl);
    }

    /**
     * @param $url
     * @param $body
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    protected function post($url, $body)
    {
        $curl = curl_init();

        $json = json_encode($body);

        $options = $this->applyCurlOptions('POST', $url, array(), array(
            'Expect:',
            'Content-Length: '.strlen($json),
        ));

        $options[CURLOPT_POSTFIELDS] = $json;

        curl_setopt_array($curl, $options);

        return $this->processCurlResponse($curl);
    }

    /**
     * @param $url
     * @param $body
     * @return array|mixed|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    protected function put($url, $body)
    {
        $curl = curl_init();

        $json = json_encode($body);

        $options = $this->applyCurlOptions('PUT', $url, array(), array(
            'Expect:',
            'Content-Length: '.strlen($json),
        ));

        $options[CURLOPT_POSTFIELDS] = $json;

        curl_setopt_array($curl, $options);

        return $this->processCurlResponse($curl);
    }

    /**
     * @param string $extra
     * @param null|array $params
     * @return string
     */
    protected function url($extra = '', $params = null)
    {
        $url = "https://{$this->data_center}.api.mailchimp.com/{$this->version}/";

        if (!empty($extra)) {
            $url .= $extra;
        }

        if (!empty($params)) {
            $url .= '?'.(is_array($params) ? http_build_query($params) : $params);
        }

        return $url;
    }

    /**
     * @param $method
     * @param $url
     * @param array $params
     * @param array $headers
     * @return array
     */
    protected function applyCurlOptions($method, $url, $params = array(), $headers = array())
    {
        $env = mailchimp_environment_variables();

        $curl_options = array(
            CURLOPT_USERPWD => "mailchimp:{$this->api_key}",
            CURLOPT_CUSTOMREQUEST => strtoupper($method),
            CURLOPT_URL => $this->url($url, $params),
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_ENCODING => "",
            CURLOPT_MAXREDIRS => 10,
            CURLOPT_TIMEOUT => 30,
            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
            CURLINFO_HEADER_OUT => true,
            CURLOPT_HTTPHEADER => array_merge(array(
                'content-type: application/json',
                'accept: application/json',
                "user-agent: MailChimp for WooCommerce/{$env->version}; PHP/{$env->php_version}; WordPress/{$env->wp_version}; Woo/{$env->wc_version};",
            ), $headers)
        );

        // if we have a dedicated IP address, and have set a configuration for it, we'll use it here.
        if (defined('MAILCHIMP_USE_OUTBOUND_IP')) {
            $curl_options[CURLOPT_INTERFACE] = MAILCHIMP_USE_OUTBOUND_IP;
        }

        // if we need to define a specific http version being used for curl requests, we can override this here.
        if (defined('MAILCHIMP_USE_HTTP_VERSION')) {
            $curl_options[CURLOPT_HTTP_VERSION] = MAILCHIMP_USE_HTTP_VERSION;
        }

        return $curl_options;
    }

    /**
     * @param $curl
     * @return array|mixed|bool|null|object
     * @throws Exception
     * @throws MailChimp_WooCommerce_Error
     * @throws MailChimp_WooCommerce_ServerError
     */
    protected function processCurlResponse($curl)
    {
        $response = curl_exec($curl);

        $err = curl_error($curl);
        $info = curl_getinfo($curl);
        curl_close($curl);

        if ($err) {
            throw new MailChimp_WooCommerce_Error('CURL error :: '.$err, '500');
        }

        $data = json_decode($response, true);

        $http_code = !empty($info) && isset($info['http_code']) ? $info['http_code'] : -1;
        $called_url = !empty($info) && isset($info['url']) ? $info['url'] : 'none';

        // let's block these from doing anything below because the API seems to be having trouble.
        if ($http_code <= 99) {
            throw new MailChimp_WooCommerce_RateLimitError('API is failing - try again.');
        }

        // possibily a successful DELETE operation
        if ($http_code == 204) {
            return true;
        }

        if ($http_code >= 200 && $http_code <= 400) {
            if (is_array($data)) {
                try {
                    $this->checkForErrors($data);
                } catch (\Exception $e) {
                    throw $e;
                }
            }
            return $data;
        }

        if ($http_code >= 400 && $http_code <= 500) {
            if ($http_code == 403) {
                throw new MailChimp_WooCommerce_RateLimitError();
            }

            throw new MailChimp_WooCommerce_Error($data['title'] .' :: '.$data['detail'], $data['status']);
        }

        if ($http_code >= 500) {
            throw new MailChimp_WooCommerce_ServerError($data['detail'], $data['status']);
        }

        if (!is_array($data)) {
            mailchimp_error("api.debug", 'fallback when data is empty from API', array('url' => $called_url, 'response' => $response));
            throw new MailChimp_WooCommerce_ServerError('API response could not be decoded.');
        }

        return null;
    }

    /**
     * @param array $data
     * @return bool
     * @throws MailChimp_WooCommerce_Error
     */
    protected function checkForErrors(array $data)
    {
        // if we have an array of error data push it into a message
        if (isset($data['errors'])) {
            $message = '';
            foreach ($data['errors'] as $error) {
                $message .= '<p>'.$error['field'].': '.$error['message'].'</p>';
            }
            throw new MailChimp_WooCommerce_Error($message, $data['status']);
        }

        // make sure the response is correct from the data in the response array
        if (isset($data['status']) && $data['status'] >= 400) {
            if (isset($data['http_code']) && $data['http_code'] == 403) {
                throw new MailChimp_WooCommerce_RateLimitError();
            }
            throw new MailChimp_WooCommerce_Error($data['detail'], $data['status']);
        }

        return false;
    }
}