Umbra-Bookshelf/Old/bd-simpleemail/inc/class-email-admin.php

<?php
/**
 * Email Admin Class
 */

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

class BD_SimpleEmail_Admin {
    private static $instance = null;

    public static function instance() {
        if (null === self::$instance) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    private function __construct() {
        add_action('admin_enqueue_scripts', array($this, 'enqueue_assets'));
    }

    public function enqueue_assets($hook) {
        $screen = get_current_screen();
        
        if (strpos($hook, 'bd-simpleemail') !== false || strpos($hook, 'bd-email') !== false) {
            wp_enqueue_style('bd-email-admin', BD_EMAIL_URI . 'assets/admin.css', array(), BD_EMAIL_VERSION);
            wp_enqueue_script('bd-email-admin', BD_EMAIL_URI . 'assets/admin.js', array('jquery'), BD_EMAIL_VERSION, true);
        }
    }

    public static function subscribers_page() {
        global $wpdb;
        $table_name = $wpdb->prefix . 'bd_subscribers';

        if (isset($_POST['bd_export_subscribers'])) {
            header('Content-Type: text/csv');
            header('Content-Disposition: attachment; filename=subscribers.csv');
            
            $subscribers = $wpdb->get_results("SELECT email, first_name, status, subscribed_at FROM {$table_name} WHERE status = 'subscribed'");
            
            echo 'Email,First Name,Status,Subscribed Date' . "\n";
            foreach ($subscribers as $sub) {
                echo esc_csv($sub->email) . ',' . esc_csv($sub->first_name) . ',' . esc_csv($sub->status) . ',' . esc_csv($sub->subscribed_at) . "\n";
            }
            exit;
        }

        $subscribers = $wpdb->get_results("SELECT * FROM {$table_name} ORDER BY subscribed_at DESC");
        $total = count($subscribers);
        $subscribed = $wpdb->get_var("SELECT COUNT(*) FROM {$table_name} WHERE status = 'subscribed'");
        $unsubscribed = $wpdb->get_var("SELECT COUNT(*) FROM {$table_name} WHERE status = 'unsubscribed'");

        echo '<div class="wrap">';
        echo '<h1>' . esc_html__('Subscribers', 'bd-simpleemail') . '</h1>';
        
        echo '<div class="bd-email-stats">';
        echo '<div class="stat-box"><h2>' . esc_html($total) . '</h2><p>Total</p></div>';
        echo '<div class="stat-box"><h2>' . esc_html($subscribed) . '</h2><p>Active</p></div>';
        echo '<div class="stat-box"><h2>' . esc_html($unsubscribed) . '</h2><p>Unsubscribed</p></div>';
        echo '</div>';
        
        echo '<form method="post">';
        echo '<p><input type="submit" name="bd_export_subscribers" class="button" value="' . esc_attr__('Export CSV', 'bd-simpleemail') . '"></p>';
        echo '</form>';
        
        echo '<table class="widefat">';
        echo '<thead><tr><th>ID</th><th>Email</th><th>First Name</th><th>Status</th><th>Subscribed</th><th>Unsubscribed</th></tr></thead>';
        echo '<tbody>';
        
        foreach ($subscribers as $sub) {
            echo '<tr>';
            echo '<td>' . esc_html($sub->id) . '</td>';
            echo '<td>' . esc_html($sub->email) . '</td>';
            echo '<td>' . esc_html($sub->first_name) . '</td>';
            echo '<td>' . esc_html($sub->status) . '</td>';
            echo '<td>' . esc_html($sub->subscribed_at) . '</td>';
            echo '<td>' . ($sub->unsubscribed_at ? esc_html($sub->unsubscribed_at) : '-') . '</td>';
            echo '</tr>';
        }
        
        echo '</tbody></table></div>';
    }

    public static function new_newsletter_page() {
        $error = '';
        $success = '';

        if (isset($_POST['bd_send_newsletter']) && check_admin_referer('bd_send_newsletter')) {
            $subject = sanitize_text_field($_POST['subject']);
            $content = wp_kses_post($_POST['content']);
            $ai_generate = isset($_POST['ai_generate']);
            $publish_blog = isset($_POST['publish_blog']);

            if ($ai_generate && $subject) {
                $prompt = sanitize_textarea_field($_POST['ai_prompt']);
                $content = self::generate_newsletter($subject, $prompt);
            }

            if ($content) {
                $result = BD_Email_Sender::send_newsletter($subject, $content);

                if ($result['success']) {
                    self::log_newsletter($subject, $content, $result['count']);
                    $success = sprintf(__('Newsletter sent to %d subscribers!', 'bd-simpleemail'), $result['count']);

                    if ($publish_blog) {
                        self::publish_as_blog_post($subject, $content);
                    }
                } else {
                    $error = $result['message'];
                }
            } else {
                $error = __('Content is required', 'bd-simpleemail');
            }
        }

        if ($ai_settings = BD_SimpleEmail::get_settings()) {
            $has_ai = !empty($ai_settings['gemini_api_key']);
        } else {
            $has_ai = false;
        }

        echo '<div class="wrap">';
        echo '<h1>' . esc_html__('New Newsletter', 'bd-simpleemail') . '</h1>';

        if ($error) {
            echo '<div class="error"><p>' . esc_html($error) . '</p></div>';
        }

        if ($success) {
            echo '<div class="updated"><p>' . esc_html($success) . '</p></div>';
        }

        if (!$has_ai) {
            echo '<div class="notice notice-warning"><p>' . esc_html__('Gemini API key not configured. AI generation disabled.', 'bd-simpleemail') . '</p></div>';
        }

        echo '<form method="post" id="newsletter-form">';
        wp_nonce_field('bd_send_newsletter');

        echo '<table class="form-table">';
        echo '<tr><th>' . esc_html__('Subject', 'bd-simpleemail') . '</th>';
        echo '<td><input type="text" name="subject" class="large-text" required></td></tr>';

        if ($has_ai) {
            echo '<tr><th>' . esc_html__('AI Generate', 'bd-simpleemail') . '</th>';
            echo '<td><input type="checkbox" name="ai_generate" id="ai_generate" value="1"> <label for="ai_generate">' . esc_html__('Use Gemini AI to generate content', 'bd-simpleemail') . '</label></td></tr>';

            echo '<tr class="ai-prompt-row" style="display:none;"><th>' . esc_html__('Prompt', 'bd-simpleemail') . '</th>';
            echo '<td><textarea name="ai_prompt" rows="4" class="large-text" placeholder="Describe what the newsletter should contain..."></textarea></td></tr>';
        }

        echo '<tr><th>' . esc_html__('Content', 'bd-simpleemail') . '</th>';
        echo '<td><textarea name="content" rows="20" class="large-text" id="newsletter-content"></textarea></td></tr>';

        echo '<tr><th>' . esc_html__('Options', 'bd-simpleemail') . '</th>';
        echo '<td><input type="checkbox" name="publish_blog" id="publish_blog" value="1"> <label for="publish_blog">' . esc_html__('Also publish as blog post', 'bd-simpleemail') . '</label></td></tr>';
        echo '</table>';

        echo '<p><input type="submit" name="bd_send_newsletter" class="button button-primary" value="' . esc_attr__('Send Newsletter', 'bd-simpleemail') . '"></p>';
        echo '</form>';

        echo '<script>';
        echo "jQuery(document).ready(function($) {";
        echo "$('#ai_generate').on('change', function() {";
        echo "$('.ai-prompt-row').toggle(this.checked);";
        echo "});";
        echo "});";
        echo '</script>';

        echo '</div>';
    }

    public static function settings_page() {
        if (isset($_POST['bd_save_email_settings'])) {
            update_option('bdm_gmail_address', sanitize_email($_POST['gmail_address']));
            update_option('bdm_sender_name', sanitize_text_field($_POST['sender_name']));
            update_option('bdm_reply_to', sanitize_email($_POST['reply_to']));

            if (!empty($_POST['gmail_password'])) {
                update_option('bdm_gmail_password', BD_Email_Sender::encrypt_password($_POST['gmail_password']));
            }

            if (!empty($_POST['gemini_api_key'])) {
                update_option('bdm_gemini_api_key', sanitize_text_field($_POST['gemini_api_key']));
            }

            echo '<div class="updated"><p>' . esc_html__('Settings saved.', 'bd-simpleemail') . '</p></div>';
        }

        $settings = BD_SimpleEmail::get_settings();
        $business = BD_SimpleEmail::get_business_info();

        echo '<div class="wrap">';
        echo '<h1>' . esc_html__('BD SimpleEmail Settings', 'bd-simpleemail') . '</h1>';

        echo '<form method="post">';
        wp_nonce_field('bd_email_settings');

        echo '<h2>' . esc_html__('Gmail Configuration', 'bd-simpleemail') . '</h2>';
        echo '<p>' . esc_html__('Configure your Gmail account for sending newsletters via SMTP.', 'bd-simpleemail') . '</p>';

        echo '<table class="form-table">';
        echo '<tr><th>' . esc_html__('Gmail Address', 'bd-simpleemail') . '</th>';
        echo '<td><input type="email" name="gmail_address" value="' . esc_attr($settings['gmail_address']) . '" class="regular-text"></td></tr>';

        echo '<tr><th>' . esc_html__('App Password', 'bd-simpleemail') . '</th>';
        echo '<td><input type="password" name="gmail_password" class="regular-text" placeholder="Leave blank to keep current">';
        echo '<p class="description"><a href="https://support.google.com/accounts/answer/185833" target="_blank">' . esc_html__('Learn how to generate an app password', 'bd-simpleemail') . '</a></p></td></tr>';

        echo '<tr><th>' . esc_html__('Sender Name', 'bd-simpleemail') . '</th>';
        echo '<td><input type="text" name="sender_name" value="' . esc_attr($settings['sender_name']) . '" class="regular-text"></td></tr>';

        echo '<tr><th>' . esc_html__('Reply-To', 'bd-simpleemail') . '</th>';
        echo '<td><input type="email" name="reply_to" value="' . esc_attr($settings['reply_to']) . '" class="regular-text"></td></tr>';
        echo '</table>';

        echo '<h2>' . esc_html__('Gemini AI', 'bd-simpleemail') . '</h2>';
        echo '<table class="form-table">';
        echo '<tr><th>' . esc_html__('API Key', 'bd-simpleemail') . '</th>';
        echo '<td><input type="text" name="gemini_api_key" value="' . esc_attr($settings['gemini_api_key']) . '" class="regular-text">';
        echo '<p class="description"><a href="https://makersuite.google.com/app/apikey" target="_blank">' . esc_html__('Get your API key', 'bd-simpleemail') . '</a></p></td></tr>';
        echo '</table>';

        echo '<h2>' . esc_html__('Business Information (CAN-SPAM)', 'bd-simpleemail') . '</h2>';
        echo '<p>' . esc_html__('These fields are required for CAN-SPAM compliance and appear in email footers.', 'bd-simpleemail') . '</p>';
        echo '<table class="form-table">';
        echo '<tr><th>' . esc_html__('Business Name', 'bd-simpleemail') . '</th>';
        echo '<td>' . esc_html($business['name'] ?: '-') . '</td></tr>';
        echo '<tr><th>' . esc_html__('Address', 'bd-simpleemail') . '</th>';
        echo '<td>' . esc_html($business['address_1']) . '<br>' . esc_html($business['address_2']) . '<br>' . esc_html($business['city']) . '<br>' . esc_html($business['country']) . '</td></tr>';
        echo '<tr><th>' . esc_html__('Phone', 'bd-simpleemail') . '</th>';
        echo '<td>' . esc_html($business['phone'] ?: '-') . '</td></tr>';
        echo '</table>';

        echo '<p><input type="submit" name="bd_save_email_settings" class="button button-primary" value="' . esc_attr__('Save Settings', 'bd-simpleemail') . '"></p>';
        echo '</form></div>';
    }

    private static function generate_newsletter($subject, $prompt) {
        $settings = BD_SimpleEmail::get_settings();
        
        if (empty($settings['gemini_api_key'])) {
            return '';
        }

        $system_instruction = "You are a professional newsletter writer for an author. Write engaging, concise newsletter content in HTML format. Use <p> for paragraphs, <h2> for headings, and <ul> for lists. Keep it friendly but professional.";

        $full_prompt = $system_instruction . "\n\nSubject: " . $subject . "\n\nAdditional instructions: " . $prompt;

        $api_url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-pro:generateContent?key=' . $settings['gemini_api_key'];

        $body = array(
            'contents' => array(
                array(
                    'parts' => array(
                        array('text' => $full_prompt)
                    )
                )
            ),
            'generationConfig' => array(
                'temperature' => 0.9,
                'maxOutputTokens' => 2048,
            ),
        );

        $response = wp_remote_post($api_url, array(
            'body' => json_encode($body),
            'headers' => array(
                'Content-Type' => 'application/json',
            ),
        ));

        if (is_wp_error($response)) {
            return '';
        }

        $data = json_decode(wp_remote_retrieve_body($response), true);
        
        if (isset($data['candidates'][0]['content']['parts'][0]['text'])) {
            return $data['candidates'][0]['content']['parts'][0]['text'];
        }

        return '';
    }

    private static function log_newsletter($subject, $content, $recipient_count) {
        global $wpdb;
        $table_name = $wpdb->prefix . 'bd_newsletters';

        $wpdb->insert($table_name, array(
            'subject' => $subject,
            'body_html' => $content,
            'sent_at' => current_time('mysql'),
            'recipient_count' => $recipient_count,
        ));
    }

    private static function publish_as_blog_post($subject, $content) {
        $post_id = wp_insert_post(array(
            'post_title' => $subject,
            'post_content' => $content,
            'post_status' => 'publish',
            'post_type' => 'post',
        ));

        return $post_id;
    }
}