class LoginWithAmazon
{
    /**
     * AmazonPay module instance
     *
     * @var AmazonPay
     */
    public $module;

    /**
     * Consume injected AmazonPay module instance
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param AmazonPay $module
     */
    public function __construct(AmazonPay $module) {
        $this->module = $module;
    }

    /**
     * Refresh login page on error. Redirect to member page on success
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @global \usc_e_shop $usces
     * @return void
     */
    public function memberPageLogin() {
        global $usces;

        $usces->error_message = $this->loginWithAmazonSignIn();
        if (empty($usces->error_message)) {
            $usces->page = 'member';
            /**
             * Mirrored Welcart action hook
             *
             * @ignore
             */
            do_action('usces_action_member_logined');
            add_filter('yoast-ga-push-after-pageview', 'usces_trackPageview_member');
        } else {
            $usces->page = 'login';
            add_filter('yoast-ga-push-after-pageview', 'usces_trackPageview_login');
        }
        add_action('the_post', [$usces, 'action_memberFilter']);
        add_action('template_redirect', [$usces, 'template_redirect']);
    }

    /**
     * Attempts to execute a login to Welcart by obtaining the users email address
     * after a successful login to their Amazon account.
     *
     * This method will return an error if the user has the Amazon login feature turned off on マイページ
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return string|void
     * @throws InvalidArgumentException Thrown by `GetBuyer` API.
     */
    public function loginWithAmazonSignIn() {
        global $wpdb;

        $token = isset($_GET['buyerToken']) ? $_GET['buyerToken'] : '';
        if (empty($token)) {
            return __('Oops! An unknown error occured.', 'wcexaap');
        }

        $result = (new GetBuyer($this->module))->get($token);
        if ($result instanceof GenericError) {
            return $result->message;
        }

        if (empty($result)) {
            return __('Oops! An unknown error occured.', 'wcexaap');
        }

        $buyerInfo = json_decode($result['response'], true);
        $email = $buyerInfo['email'];
        $member_table = $wpdb->prefix . 'usces_member';
        $query = $wpdb->prepare("SELECT ID FROM $member_table WHERE mem_email = %s", $email);
        $id = $wpdb->get_var($query);
        if (!$id) {
            return __('<b>Error:</b> E-mail address is not correct.', 'usces');
        }

        $mmeta = new MemberMeta((int)$id);
        if ($mmeta->getAllowAmazonToWelcartLogin() === false) {
            return __('Cannot login to this account with Amazon.', 'wcexaap');
        }

        $this->executeLogin($email);
        /**
         * Mirrored Welcart action hook
         *
         * @ignore
         */
        do_action('usces_action_after_login');
    }

    /**
     * Login to Welcart with Amazon account email.
     *
     * This is only possible if the user has previously registered with their Amazon account.
     * Forcing a login without first checking whether the account was registered via an Amazon
     * account is a security risk. Forcing a login with only an email match could allow someone
     * to create an Amazon account with the email of the person whose Welcart account they
     * want to highjack and then login with Amazon on a Welcart site to gain access to said
     * persons info.
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @global \wpdb $wpdb
     * @return string|array
     */
    public function loginWithAmazonCheckoutSession() {
        return function () {
            global $wpdb;

            if (usces_is_login()) {
                return;
            }

            if (empty($_REQUEST['amazonCheckoutSessionId'])) {
                return;
            }

            $sessionId = $_REQUEST['amazonCheckoutSessionId'];
            $result = (new CheckoutSession\Get($this->module))->get($sessionId);
            if ($result instanceof GenericError) {
                return;
            }

            $response = json_decode($result['response'], true);
            $email = $response['buyer']['email'];
            $member_table = $wpdb->prefix . 'usces_member';
            $query = $wpdb->prepare("SELECT ID FROM $member_table WHERE mem_email = %s", $email);
            $id = $wpdb->get_var($query);
            if (empty($id)) {
                return;
            }

            $amzmeta = new MemberMeta($id);
            if (!$amzmeta->getAllowAmazonToWelcartLogin()) {
                return;
            }

            $this->executeLogin($email);
            /**
             * Mirrored Welcart action hook
             *
             * @ignore
             */
            do_action('usces_action_after_login');
        };
    }

    /**
     * Populates `$_SESSION['usces_member']` with login data
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @global \usc_e_shop $usces
     * @global \wpdb $wpdb
     * @param string $email
     * @return void
     */
    public function executeLogin($email) {
        global $usces, $wpdb;

        $member_table = $wpdb->prefix . 'usces_member';
        $query = $wpdb->prepare("SELECT * FROM $member_table WHERE mem_email = %s", $email);
        $member = $wpdb->get_row($query, ARRAY_A);
        $_SESSION['usces_member']['ID'] = $member['ID'];
        $_SESSION['usces_member']['mailaddress1'] = $member['mem_email'];
        $_SESSION['usces_member']['mailaddress2'] = $member['mem_email'];
        $_SESSION['usces_member']['point'] = $member['mem_point'];
        $_SESSION['usces_member']['name1'] = $member['mem_name1'];
        $_SESSION['usces_member']['name2'] = $member['mem_name2'];
        $_SESSION['usces_member']['name3'] = $member['mem_name3'];
        $_SESSION['usces_member']['name4'] = $member['mem_name4'];
        $_SESSION['usces_member']['zipcode'] = $member['mem_zip'];
        $_SESSION['usces_member']['pref'] = $member['mem_pref'];
        $_SESSION['usces_member']['address1'] = $member['mem_address1'];
        $_SESSION['usces_member']['address2'] = $member['mem_address2'];
        $_SESSION['usces_member']['address3'] = $member['mem_address3'];
        $_SESSION['usces_member']['tel'] = $member['mem_tel'];
        $_SESSION['usces_member']['fax'] = $member['mem_fax'];
        $_SESSION['usces_member']['delivery_flag'] = $member['mem_delivery_flag'];
        $_SESSION['usces_member']['delivery'] = !empty($member['mem_delivery']) ? unserialize($member['mem_delivery']) : '';
        $_SESSION['usces_member']['registered'] = $member['mem_registered'];
        $_SESSION['usces_member']['nicename'] = $member['mem_nicename'];
        $_SESSION['usces_member']['country'] = $usces->get_member_meta_value('customer_country', $member['ID']);
        $_SESSION['usces_member']['status'] = $member['mem_status'];
        $usces->set_session_custom_member($member['ID']);
        $usces->get_current_member();
    }
}