Umbra-Bookshelf/umbra-bookshelf/includes/email/class-umbra-simple-email.php

<?php
// Copyright 2026 Umbra Tools (umbratools.com)
// SPDX-License-Identifier: GPL-2.0-or-later

/**
 * Main SimpleEmail Plugin Class
 *
 * @package Umbra_Simple_Email
 */

if (!defined('ABSPATH')) {
    exit;
}

class Umbra_Simple_Email {
    private static $instance = null;

    /**
     * Get instance
     *
     * @return Umbra_Simple_Email
     */
    public static function instance() {
        if (null === self::$instance) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    /**
     * Constructor
     */
    private function __construct() {
        $this->init_hooks();
    }

    /**
     * Initialize hooks
     */
    private function init_hooks() {
        add_action('admin_menu', array($this, 'add_menu_pages'));
        add_action('admin_post_bdm_signup_submit', array($this, 'handle_signup'));
        add_action('admin_post_bdm_unsubscribe_submit', array($this, 'handle_unsubscribe'));
        add_action('wp_ajax_bdm_ajax_signup', array($this, 'ajax_signup'));
        add_action('wp_ajax_nopriv_bdm_ajax_signup', array($this, 'ajax_signup'));

        add_shortcode('bdm_signup', array($this, 'signup_shortcode'));
    }

    /**
     * Add admin menu pages
     */
    public function add_menu_pages() {
        // The top-level "Umbra Bookshelf" menu is registered once by the plugin
        // bootstrap (Umbra_Bookshelf::register_admin_menu); this module only
        // contributes submenus beneath it.
        add_submenu_page(
            'umbra-bookshelf',
            esc_html__('Subscribers', 'umbra-bookshelf'),
            esc_html__('Subscribers', 'umbra-bookshelf'),
            'manage_options',
            'umbra-bookshelf-subscribers',
            array('Umbra_Simple_Email_Admin', 'subscribers_page')
        );

        add_submenu_page(
            'umbra-bookshelf',
            esc_html__('New Newsletter', 'umbra-bookshelf'),
            esc_html__('New Newsletter', 'umbra-bookshelf'),
            'manage_options',
            'umbra-bookshelf-newsletter',
            array('Umbra_Simple_Email_Admin', 'new_newsletter_page')
        );

        add_submenu_page(
            'umbra-bookshelf',
            esc_html__('Email Settings', 'umbra-bookshelf'),
            esc_html__('Email Settings', 'umbra-bookshelf'),
            'manage_options',
            'umbra-bookshelf-email-settings',
            array('Umbra_Simple_Email_Admin', 'settings_page')
        );
    }

    /**
     * Handle signup form submission
     */
    public function handle_signup() {
        if (!isset($_POST['bdm_signup_nonce']) || !wp_verify_nonce($_POST['bdm_signup_nonce'], 'bdm_signup')) {
            wp_safe_redirect(add_query_arg('error', 'invalid', home_url('/signup/')));
            exit;
        }

        $email = sanitize_email($_POST['email']);

        if (!$email) {
            wp_safe_redirect(add_query_arg('error', 'invalid', home_url('/signup/')));
            exit;
        }

        $first_name = sanitize_text_field($_POST['first_name'] ?? '');

        $result = self::subscribe($email, $first_name);

        if ($result) {
            wp_safe_redirect(add_query_arg('success', '1', home_url('/signup/')));
        } else {
            wp_safe_redirect(add_query_arg('error', 'exists', home_url('/signup/')));
        }
        exit;
    }

    /**
     * Handle unsubscribe form submission
     */
    public function handle_unsubscribe() {
        if (!isset($_POST['bdm_unsubscribe_nonce']) || !wp_verify_nonce($_POST['bdm_unsubscribe_nonce'], 'bdm_unsubscribe')) {
            wp_safe_redirect(add_query_arg('error', 'invalid', home_url('/unsubscribe/')));
            exit;
        }

        $email = sanitize_email($_POST['email']);

        if ($email) {
            self::unsubscribe($email);
        }

        wp_safe_redirect(add_query_arg('success', '1', home_url('/unsubscribe/')));
        exit;
    }

    /**
     * Handle AJAX signup
     */
    public function ajax_signup() {
        check_ajax_referer('bdm_ajax_signup');

        $email = sanitize_email($_POST['email'] ?? '');

        if (!$email || !is_email($email)) {
            wp_send_json_error(array('message' => esc_html__('Invalid email address', 'umbra-bookshelf')));
        }

        $first_name = sanitize_text_field($_POST['first_name'] ?? '');
        $opt_in = isset($_POST['opt_in']) && $_POST['opt_in'];

        if (!$opt_in) {
            wp_send_json_error(array('message' => esc_html__('Please confirm your subscription', 'umbra-bookshelf')));
        }

        $result = self::subscribe($email, $first_name);

        if ($result) {
            wp_send_json_success(array('message' => esc_html__('Thank you for subscribing!', 'umbra-bookshelf')));
        } else {
            wp_send_json_error(array('message' => esc_html__('You are already subscribed or cannot be added', 'umbra-bookshelf')));
        }
    }

    /**
     * Subscribe a new email
     *
     * @param string $email      Email address.
     * @param string $first_name First name.
     * @return bool
     */
    public static function subscribe($email, $first_name = '') {
        global $wpdb;
        $table_name = $wpdb->prefix . 'bd_subscribers';

        $exists = $wpdb->get_var($wpdb->prepare(
            "SELECT id FROM {$table_name} WHERE email = %s",
            $email
        ));

        if ($exists) {
            return false;
        }

        $result = $wpdb->insert($table_name, array(
            'email'         => $email,
            'first_name'    => $first_name,
            'status'        => 'subscribed',
            'subscribed_at' => current_time('mysql'),
            'ip_address'    => $_SERVER['REMOTE_ADDR'] ?? '',
        ));

        return $result !== false;
    }

    /**
     * Unsubscribe an email
     *
     * @param string $email Email address.
     * @return bool
     */
    public static function unsubscribe($email) {
        global $wpdb;
        $table_name = $wpdb->prefix . 'bd_subscribers';

        return $wpdb->update(
            $table_name,
            array(
                'status'           => 'unsubscribed',
                'unsubscribed_at'  => current_time('mysql'),
            ),
            array('email' => $email)
        ) !== false;
    }

    /**
     * Get subscribers
     *
     * @param string $status Status filter.
     * @return array
     */
    public static function get_subscribers($status = 'subscribed') {
        global $wpdb;
        $table_name = $wpdb->prefix . 'bd_subscribers';

        return $wpdb->get_results($wpdb->prepare(
            "SELECT * FROM {$table_name} WHERE status = %s ORDER BY subscribed_at DESC",
            $status
        ));
    }

    /**
     * Get subscriber count
     *
     * @param string $status Status filter.
     * @return int
     */
    public static function get_subscriber_count($status = 'subscribed') {
        global $wpdb;
        $table_name = $wpdb->prefix . 'bd_subscribers';

        return (int) $wpdb->get_var($wpdb->prepare(
            "SELECT COUNT(*) FROM {$table_name} WHERE status = %s",
            $status
        ));
    }

    /**
     * Get plugin settings
     *
     * @return array
     */
    public static function get_settings() {
        return array(
            'gmail_address'  => get_option('bdm_gmail_address', ''),
            'gmail_password' => get_option('bdm_gmail_password', ''),
            'sender_name'   => get_option('bdm_sender_name', get_bloginfo('name')),
            'reply_to'      => get_option('bdm_reply_to', ''),
            'gemini_api_key'=> get_option('bdm_gemini_api_key', ''),
        );
    }

    /**
     * Get business info from theme options
     *
     * @return array
     */
    public static function get_business_info() {
        $options = get_option('bdm_theme_options', array());

        return array(
            'name'       => $options['business_name'] ?? '',
            'address_1'  => $options['business_address_1'] ?? '',
            'address_2'  => $options['business_address_2'] ?? '',
            'city'       => $options['business_city'] ?? '',
            'country'    => $options['business_country'] ?? '',
            'phone'      => $options['business_phone'] ?? '',
        );
    }

    /**
     * Generate unsubscribe token
     *
     * @param string $email Email address.
     * @return string
     */
    public static function generate_unsubscribe_token($email) {
        $secret_key = defined('AUTH_KEY') ? AUTH_KEY : 'bdm_unsubscribe_secret';
        return hash_hmac('sha256', $email, $secret_key);
    }

    /**
     * Verify unsubscribe token
     *
     * @param string $email Email address.
     * @param string $token Token to verify.
     * @return bool
     */
    public static function verify_unsubscribe_token($email, $token) {
        return hash_equals(self::generate_unsubscribe_token($email), $token);
    }

    /**
     * Signup shortcode
     *
     * @param array $atts Shortcode attributes.
     * @return string
     */
    public function signup_shortcode($atts = array()) {
        $atts = shortcode_atts(array(), $atts);

        ob_start();
        ?>
        <form id="bdm-signup-form" class="bdm-signup-form">
            <?php wp_nonce_field('bdm_ajax_signup', 'bdm_signup_nonce'); ?>
            <p class="form-field">
                <label for="bdm-email"><?php esc_html_e('Email Address', 'umbra-bookshelf'); ?> *</label>
                <input type="email" id="bdm-email" name="email" required>
            </p>
            <p class="form-field">
                <label for="bdm-first-name"><?php esc_html_e('First Name', 'umbra-bookshelf'); ?></label>
                <input type="text" id="bdm-first-name" name="first_name">
            </p>
            <p class="form-field checkbox-field">
                <input type="checkbox" id="bdm-opt-in" name="opt_in" value="1" required>
                <label for="bdm-opt-in"><?php esc_html_e('I agree to receive email updates.', 'umbra-bookshelf'); ?></label>
            </p>
            <p class="form-submit">
                <button type="submit" class="submit-btn"><?php esc_html_e('Subscribe', 'umbra-bookshelf'); ?></button>
            </p>
            <div class="form-response" style="display:none;"></div>
        </form>
        <script>
        (function() {
            'use strict';
            var form = document.getElementById('bdm-signup-form');
            if (!form) return;

            form.addEventListener('submit', function(e) {
                e.preventDefault();
                var formData = new FormData(form);
                formData.append('action', 'bdm_ajax_signup');
                var response = form.querySelector('.form-response');

                fetch('<?php echo admin_url('admin-ajax.php'); ?>', {
                    method: 'POST',
                    body: formData,
                    credentials: 'same-origin'
                })
                .then(function(res) { return res.json(); })
                .then(function(data) {
                    if (data.success) {
                        response.innerHTML = '<p class="success">' + data.data.message + '</p>';
                        form.reset();
                    } else {
                        response.innerHTML = '<p class="error">' + data.data.message + '</p>';
                    }
                    response.style.display = 'block';
                })
                .catch(function() {
                    response.innerHTML = '<p class="error"><?php esc_html_e('An error occurred. Please try again.', 'umbra-bookshelf'); ?></p>';
                    response.style.display = 'block';
                });
            });
        })();
        </script>
        <?php
        return ob_get_clean();
    }
}