<?php
/**
 * Plugin Name: Affiliate Amazon Shortcode
 * Description: Display Amazon products using a shortcode with keyword, through the Product Advertising API v5 and new Creators API.
 * Version: 1.5
 * Author: OnoDev77
 * License: GPLv2 or later
 * Requires at least: 5.0
 * Requires PHP: 7.2
 * Tested up to: 6.9
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 */

if (!defined('ABSPATH')) exit; // Prevent direct access

if ( ! defined( 'AFFIAMSH_VER' ) ) {
    define( 'AFFIAMSH_VER', '1.5' );
}

/**
 * Migrazione automatica dei dati dalla versione precedente
 * Converte access_key -> access_key_paapi5 per compatibilità
 */
add_action('plugins_loaded', function() {
    $settings = get_option('affiamsh_plugin_settings', []);
    
    // Verifica se è necessaria la migrazione
    // (vecchi campi esistono MA nuovi campi NON esistono)
    $needs_migration = (
        !empty($settings['access_key']) && 
        !empty($settings['secret_key']) &&
        empty($settings['access_key_paapi5']) &&
        empty($settings['access_key_creators'])
    );
    
    if ($needs_migration) {
        // Migra i vecchi dati a PA-API 5.0 (erano quelli usati prima)
        $settings['access_key_paapi5'] = $settings['access_key'];
        $settings['secret_key_paapi5'] = $settings['secret_key'];
        
        // Mantieni i vecchi campi per sicurezza (ma non saranno più usati)
        // Non li cancelliamo per evitare perdita di dati
        
        // Se non c'è api_version impostato, usa paapi5 (era quello prima)
        if (empty($settings['api_version'])) {
            $settings['api_version'] = 'paapi5';
        }
        
        update_option('affiamsh_plugin_settings', $settings);
    }
});

/**
 * Ottiene un OAuth Access Token per Creators API usando AWS Cognito
 * Il token viene cachato per 55 minuti (scade dopo 60)
 */
function affiamsh_get_oauth_token($credential_id, $credential_secret, $version = '2.2') {
    // Verifica se abbiamo un token valido in cache
    $cache_key = 'affiamsh_oauth_token_' . md5($credential_id);
    $cached_token = get_transient($cache_key);
    if ($cached_token !== false) {
        return $cached_token;
    }
    
    // Determina il token endpoint basato sulla versione
    $token_endpoints = [
        '2.1' => 'https://creatorsapi.auth.us-east-1.amazoncognito.com/oauth2/token',  // NA
        '2.2' => 'https://creatorsapi.auth.eu-south-2.amazoncognito.com/oauth2/token',  // EU
        '2.3' => 'https://creatorsapi.auth.us-west-2.amazoncognito.com/oauth2/token',   // FE
    ];
    
    $token_url = $token_endpoints[$version] ?? $token_endpoints['2.2']; // Default EU
    
    // Richiedi nuovo token
    $response = wp_remote_post($token_url, [
        'headers' => [
            'Content-Type' => 'application/x-www-form-urlencoded'
        ],
        'body' => [
            'grant_type' => 'client_credentials',
            'client_id' => $credential_id,
            'client_secret' => $credential_secret,
            'scope' => 'creatorsapi/default'  // Scope corretto per Creators API
        ],
        'timeout' => 15
    ]);
    
    if (is_wp_error($response)) {
        return false;
    }
    
    $http_code = wp_remote_retrieve_response_code($response);
    if ($http_code !== 200) {
        return false;
    }
    
    $body = wp_remote_retrieve_body($response);
    $data = json_decode($body, true);
    
    if (empty($data['access_token'])) {
        return false;
    }
    
    $access_token = $data['access_token'];
    
    // Cachea il token per 55 minuti (scade dopo 60)
    set_transient($cache_key, $access_token, 55 * MINUTE_IN_SECONDS);
    
    return $access_token;
}

/**
 * Funzione helper per ottenere le credenziali
 * Restituisce null se non ci sono credenziali valide
 */
function affiamsh_get_credentials() {
    $settings = get_option('affiamsh_plugin_settings', []);
    $api_version = $settings['api_version'] ?? 'creators';
    
    // Determina quali credenziali usare in base all'API selezionata
    if ($api_version === 'creators') {
        $credential_id = $settings['credential_id_creators'] ?? '';
        $credential_secret = $settings['credential_secret_creators'] ?? '';
        
        $has_credentials = !empty($credential_id) && !empty($credential_secret);
        
        if (!$has_credentials || empty($settings['partner_tag'])) {
            return null;
        }
        
        // Determina la versione basata sul marketplace
        // EU marketplaces usano version 2.2
        $marketplace = $settings['marketplace'] ?? 'www.amazon.com';
        $eu_marketplaces = ['www.amazon.co.uk', 'www.amazon.de', 'www.amazon.fr', 'www.amazon.it', 
                           'www.amazon.es', 'www.amazon.nl', 'www.amazon.ae', 'www.amazon.in',
                           'www.amazon.eg', 'www.amazon.sa', 'www.amazon.se', 'www.amazon.pl',
                           'www.amazon.be', 'www.amazon.ie', 'www.amazon.tr'];
        $na_marketplaces = ['www.amazon.com', 'www.amazon.ca', 'www.amazon.com.mx', 'www.amazon.com.br'];
        $fe_marketplaces = ['www.amazon.co.jp', 'www.amazon.com.au', 'www.amazon.sg'];
        
        if (in_array($marketplace, $eu_marketplaces)) {
            $version = '2.2';
        } elseif (in_array($marketplace, $na_marketplaces)) {
            $version = '2.1';
        } elseif (in_array($marketplace, $fe_marketplaces)) {
            $version = '2.3';
        } else {
            $version = '2.2'; // Default EU
        }
        
        return [
            'credential_id' => $credential_id,
            'credential_secret' => $credential_secret,
            'partner_tag' => $settings['partner_tag'],
            'marketplace' => $marketplace,
            'version' => $version,
            'api_version' => 'creators'
        ];
        
    } else {
        // PA-API 5.0
        $access_key = $settings['access_key_paapi5'] ?? '';
        $secret_key = $settings['secret_key_paapi5'] ?? '';
        
        $has_credentials = !empty($access_key) && !empty($secret_key);
        
        if (!$has_credentials || empty($settings['partner_tag'])) {
            return null;
        }
        
        $marketplaces = affiamsh_get_amazon_marketplaces();
        return [
            'access_key' => $access_key,
            'secret_key' => $secret_key,
            'partner_tag' => $settings['partner_tag'],
            'marketplace' => $settings['marketplace'] ?? 'www.amazon.com',
            'region' => $settings['region'] ?? $marketplaces[$settings['marketplace'] ?? 'www.amazon.com'] ?? 'us-east-1',
            'api_version' => 'paapi5'
        ];
    }
}

// Enqueue plugin styles
add_action('wp_enqueue_scripts', function () {
    wp_enqueue_style(
        'affiamsh-amazon-products-style',
        plugins_url('amazon-products.css', __FILE__),
        [],
        AFFIAMSH_VER
    );
});

// Add the settings menu
add_action('admin_menu', function () {
    add_menu_page(
        'Affiliate Amazon Shortcode Settings',
        'Affiliate Amazon Shortcode',
        'manage_options',
        'affiamsh-amazon-api-settings',
        'affiamsh_amazon_api_settings_page',
        'dashicons-cart'
    );
});

// Get Amazon marketplaces
function affiamsh_get_amazon_marketplaces() {
    return [
        'www.amazon.it' => 'eu-west-1',
        'www.amazon.com' => 'us-east-1',
        'www.amazon.co.uk' => 'eu-west-1',
        'www.amazon.de' => 'eu-central-1',
        'www.amazon.fr' => 'eu-west-1',
        'www.amazon.es' => 'eu-west-1',
        'www.amazon.ca' => 'ca-central-1',
        'www.amazon.co.jp' => 'ap-northeast-1',
        'www.amazon.in' => 'ap-south-1',
    ];
}

// Get image sizes
function affiamsh_get_image_sizes() {
    return [
        'Medium' => 'Images.Primary.Medium',
        'Large' => 'Images.Primary.Large',
    ];
}

// Settings Page
function affiamsh_amazon_api_settings_page() {
    if (isset($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['affiamsh_api_settings_nonce']) &&
        wp_verify_nonce(sanitize_text_field(wp_unslash($_POST['affiamsh_api_settings_nonce'])), 'affiamsh_save_settings')) {

        $marketplace = isset($_POST['marketplace']) ? sanitize_text_field(wp_unslash($_POST['marketplace'])) : '';
        $marketplaces = affiamsh_get_amazon_marketplaces();
        $image_sizes = affiamsh_get_image_sizes();
        
        // ✅ IMPORTANTE: Carica settings esistenti prima di sovrascrivere
        $existing_settings = get_option('affiamsh_plugin_settings', []);

        $settings = [
            // Credenziali PA-API 5.0 (Legacy) - preserva se non nel POST
            'access_key_paapi5' => isset($_POST['access_key_paapi5']) ? sanitize_text_field(wp_unslash($_POST['access_key_paapi5'])) : ($existing_settings['access_key_paapi5'] ?? ''),
            'secret_key_paapi5' => isset($_POST['secret_key_paapi5']) ? sanitize_text_field(wp_unslash($_POST['secret_key_paapi5'])) : ($existing_settings['secret_key_paapi5'] ?? ''),
            // Credenziali Creators API (OAuth 2.0) - preserva se non nel POST
            'credential_id_creators' => isset($_POST['credential_id_creators']) ? sanitize_text_field(wp_unslash($_POST['credential_id_creators'])) : ($existing_settings['credential_id_creators'] ?? ''),
            'credential_secret_creators' => isset($_POST['credential_secret_creators']) ? sanitize_text_field(wp_unslash($_POST['credential_secret_creators'])) : ($existing_settings['credential_secret_creators'] ?? ''),
            // Impostazioni comuni
            'partner_tag' => isset($_POST['partner_tag']) ? sanitize_text_field(wp_unslash($_POST['partner_tag'])) : ($existing_settings['partner_tag'] ?? ''),
            'region' => $marketplaces[$marketplace] ?? 'us-east-1',
            'marketplace' => $marketplace,
            // ✅ IMPORTANTE: Preserva api_version esistente se non nel POST
            'api_version' => isset($_POST['api_version']) ? sanitize_text_field(wp_unslash($_POST['api_version'])) : ($existing_settings['api_version'] ?? 'paapi5'),
            'num_products' => isset($_POST['num_products']) ? absint(wp_unslash($_POST['num_products'])) : 3,
            'num_columns' => isset($_POST['num_columns']) ? absint(wp_unslash($_POST['num_columns'])) : 3,
            'image_size' => isset($_POST['image_size']) ? sanitize_text_field(wp_unslash($_POST['image_size'])) : 'Medium',
            'font_size' => isset($_POST['font_size']) ? affiamsh_validate_font_size(sanitize_text_field(wp_unslash($_POST['font_size']))) : '16px',
        ];
        
        // ✅ ENFORCE FREE LIMITS (max 3 products, max 3 columns)
        $is_pro = affiamsh_is_pro();
        if (!$is_pro) {
            if ($settings['num_products'] > 3) {
                $settings['num_products'] = 3;
                echo '<div class="notice notice-warning"><p><strong>⚠️ FREE version limit:</strong> Number of products set to maximum 3. <a href="' . esc_url(admin_url('admin.php?page=affiamsh-activate-pro')) . '">Upgrade to PRO</a> for up to 9 products.</p></div>';
            }
            if ($settings['num_columns'] > 3) {
                $settings['num_columns'] = 3;
                echo '<div class="notice notice-warning"><p><strong>⚠️ FREE version limit:</strong> Number of columns set to maximum 3.</p></div>';
            }
        }

        update_option('affiamsh_plugin_settings', $settings);
        echo '<div class="updated"><p>Settings saved successfully.</p></div>';
    }

    $settings = get_option('affiamsh_plugin_settings', []);
    $credentials = affiamsh_get_credentials();
    $marketplaces = affiamsh_get_amazon_marketplaces();
    $image_sizes = affiamsh_get_image_sizes();
    ?>
    <div class="wrap">
        <h1>
            Amazon API Settings 
            <?php if (affiamsh_is_pro()): ?>
                <span style="background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; padding: 4px 12px; border-radius: 4px; font-size: 14px; font-weight: 600; margin-left: 10px;">💎 PRO</span>
            <?php else: ?>
                <span style="background: #f0f0f1; color: #50575e; padding: 4px 12px; border-radius: 4px; font-size: 14px; font-weight: 600; margin-left: 10px;">FREE</span>
                <a href="<?php echo esc_url(admin_url('admin.php?page=affiamsh-activate-pro')); ?>" style="background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; padding: 6px 16px; border-radius: 4px; font-size: 14px; font-weight: 600; margin-left: 10px; text-decoration: none; display: inline-block;">
                    ⚡ Upgrade to PRO
                </a>
            <?php endif; ?>
        </h1>
        
        <?php 
        $api_version = $settings['api_version'] ?? 'creators';
        $credentials = affiamsh_get_credentials();
        
        // Mostra avviso se non ci sono credenziali
        if ($credentials === null):
        ?>
        <div class="notice notice-error">
            <p><strong>⚠️ API Credentials Required</strong></p>
            <p>To display Amazon products, you need to configure your API credentials below.</p>
            <p>
                <?php if ($api_version === 'creators'): ?>
                    <a href="https://affiliate-program.amazon.com/creatorsapi" target="_blank">Get Creators API credentials →</a>
                <?php else: ?>
                    Configure your PA-API 5.0 credentials below.
                <?php endif; ?>
            </p>
        </div>
        <?php endif; ?>
        
        <?php 
        // Mostra avviso se usa PA-API 5.0
        if ($api_version === 'paapi5'): 
        ?>
        <div class="notice notice-warning">
            <p><strong>⚠️ Legacy API Selected</strong></p>
            <p>You're currently using PA-API 5.0 which will be deprecated after <strong>January 31, 2026</strong>.</p>
            <p>Please migrate to Creators API as soon as possible to avoid service interruptions.</p>
        </div>
        <?php endif; ?>
        
        <form method="post">
            <?php wp_nonce_field('affiamsh_save_settings', 'affiamsh_api_settings_nonce'); ?>
            <table class="form-table">
                <tr>
                    <th scope="row">API Version</th>
                    <td>
                        <?php
                        // ✅ Default intelligente per backward compatibility
                        // Se esistono credenziali PA-API 5.0 → default 'paapi5'
                        // Altrimenti → default 'creators'
                        $has_paapi5 = !empty($settings['access_key_paapi5']) || !empty($settings['access_key']);
                        $default_api = $has_paapi5 ? 'paapi5' : 'creators';
                        $current_api = $settings['api_version'] ?? $default_api;
                        ?>
                        <select name="api_version" id="affiamsh_api_version" class="regular-text" onchange="affiamsh_toggle_credentials()">
                            <option value="creators" <?php selected($current_api, 'creators'); ?>>
                                Creators API (OAuth 2.0)
                            </option>
                            <option value="paapi5" <?php selected($current_api, 'paapi5'); ?>>
                                PA-API 5.0 (Legacy)
                            </option>
                        </select>
                        <p class="description">Select which Amazon API to use. Creators API is the recommended option going forward.</p>
                    </td>
                </tr>
                
                <!-- Creators API Credentials (OAuth 2.0) -->
                <tr id="affiamsh_creators_section" style="<?php echo $current_api === 'creators' ? '' : 'display:none;'; ?>">
                    <td colspan="2">
                        <h3 style="margin-bottom: 10px;">🆕 Creators API Credentials (OAuth 2.0)</h3>
                        <p class="description">Select which Amazon API to use. Creators API is the recommended option going forward.</p>
                    </td>
                </tr>
                <tr id="affiamsh_creators_credential_id" style="<?php echo $current_api === 'creators' ? '' : 'display:none;'; ?>">
                    <th scope="row">Credential ID (Client ID)</th>
                    <td>
                        <input type="text" name="credential_id_creators" value="<?php echo esc_attr($settings['credential_id_creators'] ?? ''); ?>" class="regular-text" placeholder="xxxxx">
                        <p class="description">Example: 1n26dp0288qdpmtqomel7xxxxx</p>
                    </td>
                </tr>
                <tr id="affiamsh_creators_credential_secret" style="<?php echo $current_api === 'creators' ? '' : 'display:none;'; ?>">
                    <th scope="row">Credential Secret (Client Secret)</th>
                    <td>
                        <input type="text" name="credential_secret_creators" value="<?php echo esc_attr($settings['credential_secret_creators'] ?? ''); ?>" class="regular-text" placeholder="xxxxx">
                        <p class="description">Example: 1nosi490l2rho03dhjnq9f7o3vmufb90drds71kqcfjc1jixxxxx</p>
                    </td>
                </tr>
                
                <!-- PA-API 5.0 Credentials -->
                <tr id="affiamsh_paapi5_section" style="<?php echo $current_api === 'paapi5' ? '' : 'display:none;'; ?>">
                    <td colspan="2">
                        <h3 style="margin-bottom: 10px;">PA-API 5.0 Credentials (Legacy)</h3>
                        <p class="description">PA-API 5.0 credentials (legacy mode).</p>
                    </td>
                </tr>
                <tr id="affiamsh_paapi5_access_key" style="<?php echo $current_api === 'paapi5' ? '' : 'display:none;'; ?>">
                    <th scope="row">Access Key (PA-API 5.0)</th>
                    <td>
                        <input type="text" name="access_key_paapi5" value="<?php echo esc_attr($settings['access_key_paapi5'] ?? ''); ?>" class="regular-text" placeholder="AKIAIOSFODNN7EXAMPLE">
                        <p class="description">Your legacy PA-API 5.0 Access Key</p>
                    </td>
                </tr>
                <tr id="affiamsh_paapi5_secret_key" style="<?php echo $current_api === 'paapi5' ? '' : 'display:none;'; ?>">
                    <th scope="row">Secret Key (PA-API 5.0)</th>
                    <td>
                        <input type="text" name="secret_key_paapi5" value="<?php echo esc_attr($settings['secret_key_paapi5'] ?? ''); ?>" class="regular-text" placeholder="wJalrXUtnFEMI...">
                        <p class="description">Your legacy PA-API 5.0 Secret Key</p>
                    </td>
                </tr>
                
                <tr>
                    <th scope="row">Partner Tag</th>
                    <td>
                        <input type="text" name="partner_tag" value="<?php echo esc_attr($settings['partner_tag'] ?? ''); ?>" class="regular-text" placeholder="e.g., yourid-21" required>
                        <p class="description">Your Amazon Affiliate ID (same for both APIs)</p>
                    </td>
                </tr>
                <tr>
                    <th scope="row">Marketplace</th>
                    <td>
                        <select name="marketplace" class="regular-text">
                            <?php foreach ($marketplaces as $marketplace => $region): ?>
                                <option value="<?php echo esc_attr($marketplace); ?>" <?php selected($settings['marketplace'] ?? 'www.amazon.com', $marketplace); ?>>
                                    <?php echo esc_html($marketplace); ?>
                                </option>
                            <?php endforeach; ?>
                        </select>
                    </td>
                </tr>
                <tr>
                    <th scope="row">Number of Products</th>
                    <td>
                        <select name="num_products" class="regular-text" id="affiamsh_num_products">
                            <?php 
                            $is_pro = affiamsh_is_pro();
                            $current_num = $settings['num_products'] ?? 3;
                            
                            for ($i = 1; $i <= 9; $i++): 
                                $disabled = (!$is_pro && $i > 3) ? 'disabled' : '';
                                $pro_badge = (!$is_pro && $i > 3) ? ' 🔒 PRO' : '';
                            ?>
                                <option value="<?php echo esc_attr($i); ?>" 
                                        <?php selected($current_num, $i); ?>
                                        <?php echo esc_attr($disabled); ?>>
                                    <?php echo esc_html($i . $pro_badge); ?>
                                </option>
                            <?php endfor; ?>
                        </select>
                        <?php if (!$is_pro): ?>
                            <p class="description" style="color: #d63638;">
                                🔒 <strong>FREE version limited to 3 products.</strong> 
                                <a href="<?php echo esc_url(admin_url('admin.php?page=affiamsh-activate-pro')); ?>" style="font-weight: 600;">Upgrade to PRO</a> 
                                to display up to 9 products per shortcode.
                            </p>
                        <?php endif; ?>
                    </td>
                </tr>
                <tr>
                    <th scope="row">Number of Columns</th>
                    <td>
                        <select name="num_columns" class="regular-text" id="affiamsh_num_columns">
                            <?php 
                            $is_pro = affiamsh_is_pro();
                            $current_cols = $settings['num_columns'] ?? 3;
                            
                            for ($i = 1; $i <= 4; $i++): 
                                $disabled = (!$is_pro && $i > 3) ? 'disabled' : '';
                                $pro_badge = (!$is_pro && $i > 3) ? ' 🔒 PRO' : '';
                            ?>
                                <option value="<?php echo esc_attr($i); ?>" 
                                        <?php selected($current_cols, $i); ?>
                                        <?php echo esc_attr($disabled); ?>>
                                    <?php echo esc_html($i . $pro_badge); ?>
                                </option>
                            <?php endfor; ?>
                        </select>
                        <?php if (!$is_pro): ?>
                            <p class="description" style="color: #666;">
                                🔒 4-column layout requires PRO.
                            </p>
                        <?php endif; ?>
                    </td>
                </tr>
                <tr>
                    <th scope="row">Image Size</th>
                    <td>
                        <select name="image_size" class="regular-text">
                            <?php foreach ($image_sizes as $key => $value): ?>
                                <option value="<?php echo esc_attr($key); ?>" <?php selected($settings['image_size'] ?? 'Medium', $key); ?>>
                                    <?php echo esc_html(ucfirst($key)); ?>
                                </option>
                            <?php endforeach; ?>
                        </select>
                    </td>
                </tr>
                <tr>
                    <th scope="row">Font Size</th>
                    <td>
                        <input type="text" name="font_size" value="<?php echo esc_attr($settings['font_size'] ?? '16px'); ?>" class="regular-text">
                        <p class="description">Enter font size, e.g., <code>14px</code>, <code>16px</code>, <code>18px</code></p>
                    </td>
                </tr>
                
                <tr>
                    <th scope="row">Shortcode Format</th>
                    <td>
                        <p>Add this shortcode in your post/page <code>[affiamsh_amazon keyword="Your Keyword"]</code></p>
                    </td>
                </tr>
                
                <tr>
                    <th scope="row">Go Premium</th>
                    <td>
                        <p>Unlock additional features with the Premium version of this plugin. 
                        <a href="https://www.softwareapp.it/affiliate-amazon-shortcode/" target="_blank" rel="nofollow noopener">Learn more</a>.</p>
                    </td>
                </tr>
            </table>
            <?php submit_button('Save Settings'); ?>
        </form>
        
        <?php
        // Mostra pulsante di test se ci sono credenziali
        $test_credentials = affiamsh_get_credentials();
        if ($test_credentials !== null):
        ?>
        <hr style="margin: 30px 0;">
        <h2>Test API Connection</h2>
        <p>Click the button below to test your API credentials with a sample request.</p>
        <form method="post" style="margin-top: 15px;">
            <?php wp_nonce_field('affiamsh_test_api', 'affiamsh_test_api_nonce'); ?>
            <button type="submit" name="test_api" class="button button-secondary">
                🔍 Test API Connection
            </button>
        </form>
        
        <?php
        // Gestione test API
        if (isset($_POST['test_api']) && 
            isset($_POST['affiamsh_test_api_nonce']) &&
            wp_verify_nonce(sanitize_text_field(wp_unslash($_POST['affiamsh_test_api_nonce'])), 'affiamsh_test_api')) {
            
            $test_result = affiamsh_test_api_connection();
            
            if ($test_result['success']) {
                echo '<div class="notice notice-success" style="margin-top: 15px;">';
                echo '<p><strong>✅ API Connection Successful!</strong></p>';
                echo '<p>Your credentials are working correctly.</p>';
                echo '<p>Found ' . esc_html($test_result['item_count']) . ' products for test keyword "laptop".</p>';
                echo '</div>';
            } else {
                echo '<div class="notice notice-error" style="margin-top: 15px;">';
                echo '<p><strong>❌ API Connection Failed</strong></p>';
                echo '<p>' . esc_html($test_result['message']) . '</p>';
                if (!empty($test_result['details'])) {
                    echo '<details><summary>Error Details</summary>';
                    echo '<pre>' . esc_html($test_result['details']) . '</pre>';
                    echo '</details>';
                }
                echo '</div>';
            }
        }
        endif;
        ?>
        
        <script>
        function affiamsh_toggle_credentials() {
            var apiVersion = document.getElementById('affiamsh_api_version').value;
            
            // Elementi Creators API
            var creatorsSection = document.getElementById('affiamsh_creators_section');
            var creatorsCredentialId = document.getElementById('affiamsh_creators_credential_id');
            var creatorsCredentialSecret = document.getElementById('affiamsh_creators_credential_secret');
            
            // Elementi PA-API 5.0
            var paapi5Section = document.getElementById('affiamsh_paapi5_section');
            var paapi5AccessKey = document.getElementById('affiamsh_paapi5_access_key');
            var paapi5SecretKey = document.getElementById('affiamsh_paapi5_secret_key');
            
            if (apiVersion === 'creators') {
                // Mostra Creators API
                creatorsSection.style.display = '';
                creatorsCredentialId.style.display = '';
                creatorsCredentialSecret.style.display = '';
                // Nascondi PA-API 5.0
                paapi5Section.style.display = 'none';
                paapi5AccessKey.style.display = 'none';
                paapi5SecretKey.style.display = 'none';
            } else {
                // Mostra PA-API 5.0
                paapi5Section.style.display = '';
                paapi5AccessKey.style.display = '';
                paapi5SecretKey.style.display = '';
                // Nascondi Creators API
                creatorsSection.style.display = 'none';
                creatorsCredentialId.style.display = 'none';
                creatorsCredentialSecret.style.display = 'none';
            }
        }
        
        <?php if (!affiamsh_is_pro()): ?>
        // ✅ FREE VERSION: Alert quando si clicca su opzioni PRO
        document.addEventListener('DOMContentLoaded', function() {
            // Number of Products select
            var numProductsSelect = document.getElementById('affiamsh_num_products');
            if (numProductsSelect) {
                numProductsSelect.addEventListener('change', function(e) {
                    var selectedValue = parseInt(e.target.value);
                    if (selectedValue > 3) {
                        e.preventDefault();
                        if (confirm('🔒 This feature requires PRO version.\n\n' +
                                  'FREE version is limited to 3 products.\n' +
                                  'Upgrade to PRO to display up to 9 products.\n\n' +
                                  'Click OK to see upgrade options.')) {
                            window.location.href = '<?php echo esc_url(admin_url('admin.php?page=affiamsh-activate-pro')); ?>';
                        }
                        // Reset alla selezione precedente (3 o meno)
                        e.target.value = '3';
                    }
                });
            }
            
            // Number of Columns select
            var numColumnsSelect = document.getElementById('affiamsh_num_columns');
            if (numColumnsSelect) {
                numColumnsSelect.addEventListener('change', function(e) {
                    var selectedValue = parseInt(e.target.value);
                    if (selectedValue > 3) {
                        e.preventDefault();
                        if (confirm('🔒 This feature requires PRO version.\n\n' +
                                  'FREE version is limited to 3 columns.\n' +
                                  'Upgrade to PRO for 4-column layouts.\n\n' +
                                  'Click OK to see upgrade options.')) {
                            window.location.href = '<?php echo esc_url(admin_url('admin.php?page=affiamsh-activate-pro')); ?>';
                        }
                        // Reset alla selezione precedente (3 o meno)
                        e.target.value = '3';
                    }
                });
            }
        });
        <?php endif; ?>
        </script>
    </div>
    <?php
}

// Validate font size
function affiamsh_validate_font_size($value) {
    return preg_match('/^\d+(px|em|rem|%)$/', $value) ? $value : '16px';
}

/**
 * Testa la connessione API con una richiesta di prova
 */
function affiamsh_test_api_connection() {
    $credentials = affiamsh_get_credentials();
    $settings = get_option('affiamsh_plugin_settings', []);
    
    if ($credentials === null) {
        return [
            'success' => false,
            'message' => 'No credentials configured',
            'details' => ''
        ];
    }
    
    $api_version = $credentials['api_version'] ?? 'creators';
    
    // Test per Creators API (OAuth 2.0 Cognito)
    if ($api_version === 'creators') {
        // Step 1: Ottieni OAuth token
        $access_token = affiamsh_get_oauth_token(
            $credentials['credential_id'],
            $credentials['credential_secret'],
            $credentials['version'] ?? '2.2'
        );
        
        if ($access_token === false) {
            return [
                'success' => false,
                'message' => 'OAuth authentication failed. Could not obtain access token from Cognito.',
                'details' => 'Check your Credential ID and Credential Secret. Version: ' . ($credentials['version'] ?? '2.2')
            ];
        }
        
        // Step 2: Test con richiesta API Creators
        $payload = json_encode([
            'keywords' => 'laptop',
            'resources' => ['itemInfo.title'],
            'searchIndex' => 'All',
            'partnerTag' => $credentials['partner_tag'],
            'marketplace' => $credentials['marketplace'],
            'itemCount' => 1
        ]);
        
        // Endpoint Creators API corretto
        $url = 'https://creatorsapi.amazon/catalog/v1/searchItems';
        $url = add_query_arg(['marketplace' => $credentials['marketplace']], $url);
        
        // Headers Creators API con Version
        $headers = [
            'Authorization' => 'Bearer ' . $access_token . ', Version ' . ($credentials['version'] ?? '2.2'),
            'Content-Type' => 'application/json',
            'x-marketplace' => $credentials['marketplace']
        ];
        
        $response = wp_remote_post($url, [
            'headers' => $headers,
            'body'    => $payload,
            'timeout' => 15,
            'method'  => 'POST',
        ]);
        
    } else {
        // Test per PA-API 5.0 (AWS Signature)
        $payload = json_encode([
            'Keywords' => 'laptop',
            'Resources' => ['ItemInfo.Title'],
            'SearchIndex' => 'All',
            'PartnerTag' => $credentials['partner_tag'],
            'PartnerType' => 'Associates',
            'Marketplace' => $credentials['marketplace'],
            'ItemCount' => 1
        ]);
        
        $host = str_replace('www.', 'webservices.', $credentials['marketplace']);
        $uriPath = "/paapi5/searchitems";
        $url = 'https://' . $host . $uriPath;
        
        $awsv4 = new Affiamsh_AwsV4($credentials['access_key'], $credentials['secret_key']);
        $awsv4->setRegionName($credentials['region']);
        $awsv4->setServiceName("ProductAdvertisingAPI");
        $awsv4->setPath($uriPath);
        $awsv4->setPayload($payload);
        $awsv4->setRequestMethod("POST");
        $awsv4->addHeader('content-encoding', 'amz-1.0');
        $awsv4->addHeader('content-type', 'application/json; charset=utf-8');
        $awsv4->addHeader('host', $host);
        $awsv4->addHeader('x-amz-target', 'com.amazon.paapi5.v1.ProductAdvertisingAPIv1.SearchItems');
        
        $headers = $awsv4->getHeaders();
        
        $response = wp_remote_post($url, [
            'headers' => $headers,
            'body'    => $payload,
            'timeout' => 15,
            'method'  => 'POST',
        ]);
    }
    
    // Verifica risposta (comune per entrambe le API)
    if (is_wp_error($response)) {
        return [
            'success' => false,
            'message' => 'Connection error: ' . $response->get_error_message(),
            'details' => ''
        ];
    }
    
    $http_code = wp_remote_retrieve_response_code($response);
    $body = wp_remote_retrieve_body($response);
    
    if ($http_code !== 200) {
        $api_name = $api_version === 'creators' ? 'Creators API' : 'PA-API 5.0';
        
        if ($http_code === 401) {
            $message = 'Authentication failed with ' . $api_name . '. ';
            if ($api_version === 'creators') {
                $message .= 'Make sure your Credential ID and Credential Secret are correct and from Creators API section in Associates Central.';
            } else {
                $message .= 'Check that your Access Key and Secret Key are correct.';
            }
        } else {
            $message = $api_name . ' returned HTTP ' . $http_code;
        }
        
        return [
            'success' => false,
            'message' => $message,
            'details' => $body
        ];
    }
    
    // Successo - conta items
    $data = json_decode($body, true);
    $items = $data['searchResult']['items'] ?? $data['SearchResult']['Items'] ?? [];
    
    return [
        'success' => true,
        'message' => 'Connection successful!',
        'item_count' => count($items),
        'details' => ''
    ];
}

// Shortcode function
function affiamsh_amazon_handler($atts) {
    $atts = shortcode_atts(['keyword' => 'smartphone'], $atts, 'affiamsh_amazon');
    $settings = get_option('affiamsh_plugin_settings', []);
    
    // Ottieni le credenziali
    $credentials = affiamsh_get_credentials();
    
    // Verifica se le credenziali sono state configurate
    if ($credentials === null) {
        $api_version = $settings['api_version'] ?? 'creators';
        $api_name = $api_version === 'creators' ? 'Creators API' : 'PA-API 5.0';
        
        return '<div style="padding: 12px; background: #f8f9fa; border: 1px solid #dee2e6; border-radius: 4px; margin: 20px 0; color: #6c757d; font-size: 14px;">'
            . '<p style="margin: 0; font-weight: 500;">API not configured</p>'
            . '<p style="margin: 5px 0 0 0; font-size: 13px;">Configure ' . esc_html($api_name) . ' in '
            . '<a href="' . esc_url(admin_url('admin.php?page=affiamsh-amazon-api-settings')) . '" style="color: #007bff;">Settings</a></p>'
            . '</div>';
    }
    
    // Determina quale API usare
    $api_version = $settings['api_version'] ?? 'creators';
    
    if ($api_version === 'creators') {
        return affiamsh_call_creators_api($atts, $settings, $credentials);
    } else {
        return affiamsh_call_paapi5($atts, $settings, $credentials);
    }
}
add_shortcode('affiamsh_amazon', 'affiamsh_amazon_handler');

/**
 * Funzione per chiamare la nuova Creators API con OAuth 2.0 Cognito
 */
function affiamsh_call_creators_api($atts, $settings, $credentials) {
    // Ottieni OAuth access token
    $access_token = affiamsh_get_oauth_token(
        $credentials['credential_id'],
        $credentials['credential_secret'],
        $credentials['version'] ?? '2.2'
    );
    
    if ($access_token === false) {
        return '<div style="padding: 12px; background: #f8f9fa; border: 1px solid #dee2e6; border-radius: 4px; margin: 20px 0; color: #6c757d; font-size: 14px;">'
            . '<p style="margin: 0; font-weight: 500;">Authentication failed</p>'
            . '<p style="margin: 5px 0 0 0; font-size: 13px;">Check credentials in <a href="' . esc_url(admin_url('admin.php?page=affiamsh-amazon-api-settings')) . '" style="color: #007bff;">Settings</a></p>'
            . (current_user_can('manage_options') ? '<p style="margin: 5px 0 0 0; font-size: 11px; color: #999;">ID: ' . esc_html(substr($credentials['credential_id'], 0, 10)) . '... (len: ' . strlen($credentials['credential_id']) . ')</p>' : '')
            . '</div>';
    }
    
    // Construct the payload con naming lowerCamelCase per Creators API
    $image_sizes = affiamsh_get_image_sizes();
    $image_size_key = $settings['image_size'] ?? 'Medium';
    $image_size_mapping = [
        'Small' => 'images.primary.small',
        'Medium' => 'images.primary.medium',
        'Large' => 'images.primary.large'
    ];
    $image_resource = $image_size_mapping[$image_size_key] ?? 'images.primary.medium';

    $payload = json_encode([
        'keywords' => $atts['keyword'],
        'resources' => [
            $image_resource,
            'itemInfo.title',
            'itemInfo.features',
            'offersV2.listings.price'
        ],
        'searchIndex' => 'All',
        'partnerTag' => $credentials['partner_tag'],
        'marketplace' => $credentials['marketplace'],
        'itemCount' => absint($settings['num_products'] ?? 3)
    ]);

    // Nuovo endpoint Creators API
    $url = 'https://creatorsapi.amazon/catalog/v1/searchItems';
        $url = add_query_arg(['marketplace' => $credentials['marketplace']], $url);

    // Headers con formato Creators API (include Version!)
    $headers = [
        'Authorization' => 'Bearer ' . $access_token . ', Version ' . ($credentials['version'] ?? '2.2'),
        'Content-Type' => 'application/json',
        'x-marketplace' => $credentials['marketplace']
    ];

    // Perform the API request
    $response = wp_remote_post($url, [
        'headers' => $headers,
        'body'    => $payload,
        'timeout' => 20,
        'method'  => 'POST',
    ]);

    if (is_wp_error($response)) {
        return '<p>Error: ' . esc_html($response->get_error_message()) . '</p>';
    }

    $http_code = wp_remote_retrieve_response_code($response);
    if ($http_code !== 200) {
        $error_body = wp_remote_retrieve_body($response);
        
        // Messaggio discreto per utenti pubblici
        $error_message = '<div style="padding: 12px; background: #f8f9fa; border: 1px solid #dee2e6; border-radius: 4px; margin: 20px 0; color: #6c757d; font-size: 14px;">';
        $error_message .= '<p style="margin: 0; font-weight: 500;">API Error (HTTP ' . esc_html($http_code) . ')</p>';
        
        // Dettagli tecnici SOLO per admin, molto discreti
        if (current_user_can('manage_options')) {
            $error_message .= '<details style="margin-top: 8px;">';
            $error_message .= '<summary style="cursor: pointer; color: #999; font-size: 12px;">Technical details</summary>';
            $error_message .= '<div style="margin-top: 8px; padding: 8px; background: #fff; border: 1px solid #e9ecef; border-radius: 3px; font-size: 11px; color: #666;">';
            
            if ($http_code === 401 || $http_code === 403) {
                $error_message .= '<p style="margin: 0 0 5px 0;">Authentication failed. Possible causes:</p>';
                $error_message .= '<ul style="margin: 5px 0 10px 20px; padding: 0;">';
                $error_message .= '<li>Incorrect credentials</li>';
                $error_message .= '<li>Token expired</li>';
                $error_message .= '<li>Account not eligible (needs 10 sales)</li>';
                $error_message .= '</ul>';
            }
            
            $error_message .= '<div style="font-family: monospace; font-size: 10px; background: #f8f9fa; padding: 6px; border-radius: 2px; overflow: auto;">';
            $error_message .= 'API: Creators API (OAuth 2.0)<br>';
            $error_message .= 'Endpoint: ' . esc_html($url) . '<br>';
            $error_message .= 'Version: ' . esc_html($credentials['version'] ?? '2.2') . '<br>';
            $error_message .= 'Marketplace: ' . esc_html($credentials['marketplace']) . '<br>';
            $error_message .= 'Token: ' . ($access_token ? 'Present' : 'Missing') . '<br><br>';
            $error_message .= 'Response: ' . esc_html($error_body);
            $error_message .= '</div>';
            
            $error_message .= '</div>';
            $error_message .= '</details>';
        }
        
        $error_message .= '</div>';
        
        return $error_message;
    }

    $body = wp_remote_retrieve_body($response);
    $data = json_decode($body, true);
    
    if (empty($data)) {
        return '<p>Error: Unable to parse the Amazon server response.</p>';
    }

    // Gestione risposta Creators API
    if (empty($data['searchResult']['items'])) {
        return '<p>No products found for keyword: ' . esc_html($atts['keyword']) . '</p>';
    }

    $items = $data['searchResult']['items'];
    
    return affiamsh_render_products($items, $settings, $image_size_key);
}

/**
 * Funzione per chiamare la vecchia PA-API 5.0 (Legacy)
 */
function affiamsh_call_paapi5($atts, $settings, $credentials) {
    // Construct the payload con naming PascalCase per PA-API 5.0
    $image_sizes = affiamsh_get_image_sizes();
    $image_size_key = $settings['image_size'] ?? 'Medium';
    $image_size = $image_sizes[$image_size_key] ?? 'Images.Primary.Medium';

    $payload = "{"
    . " \"Keywords\": \"" . esc_js($atts['keyword']) . "\","
    . " \"Resources\": ["
    . "  \"$image_size\","
    . "  \"ItemInfo.ContentInfo\","
    . "  \"ItemInfo.Title\","
    . "  \"Offers.Listings.Price\""
    . " ],"
    . " \"SearchIndex\": \"All\","
    . " \"PartnerTag\": \"" . esc_js($credentials['partner_tag']) . "\","
    . " \"PartnerType\": \"Associates\","
    . " \"Marketplace\": \"" . esc_js($credentials['marketplace']) . "\","
    . " \"ItemCount\": " . absint($settings['num_products'] ?? 3)
    . "}";    

    $host = str_replace('www.', 'webservices.', $credentials['marketplace']);
    $uriPath = "/paapi5/searchitems";
    $url = 'https://' . $host . $uriPath;

    // Sign the request using AwsV4
    $awsv4 = new Affiamsh_AwsV4($credentials['access_key'], $credentials['secret_key']);
    $awsv4->setRegionName($credentials['region']);
    $awsv4->setServiceName("ProductAdvertisingAPI");
    $awsv4->setPath($uriPath);
    $awsv4->setPayload($payload);
    $awsv4->setRequestMethod("POST");
    $awsv4->addHeader('content-encoding', 'amz-1.0');
    $awsv4->addHeader('content-type', 'application/json; charset=utf-8');
    $awsv4->addHeader('host', $host);
    $awsv4->addHeader('x-amz-target', 'com.amazon.paapi5.v1.ProductAdvertisingAPIv1.SearchItems');

    $headers = $awsv4->getHeaders();

    // Perform the API request
    $response = wp_remote_post($url, [
        'headers' => $headers,
        'body'    => $payload,
        'timeout' => 20,
        'method'  => 'POST',
    ]);

    if (is_wp_error($response)) {
        return '<p>Error: ' . esc_html($response->get_error_message()) . '</p>';
    }

    $http_code = wp_remote_retrieve_response_code($response);
    if ($http_code !== 200) {
        $error_body = wp_remote_retrieve_body($response);
        $error_data = json_decode($error_body, true);
        
        // Messaggio discreto per utenti pubblici
        $error_message = '<div style="padding: 12px; background: #f8f9fa; border: 1px solid #dee2e6; border-radius: 4px; margin: 20px 0; color: #6c757d; font-size: 14px;">';
        $error_message .= '<p style="margin: 0; font-weight: 500;">API Error (HTTP ' . esc_html($http_code) . ')</p>';
        
        // Dettagli tecnici SOLO per admin, molto discreti
        if (current_user_can('manage_options')) {
            $error_message .= '<details style="margin-top: 8px;">';
            $error_message .= '<summary style="cursor: pointer; color: #999; font-size: 12px;">Technical details</summary>';
            $error_message .= '<div style="margin-top: 8px; padding: 8px; background: #fff; border: 1px solid #e9ecef; border-radius: 3px; font-size: 11px; color: #666;">';
            
            if ($http_code === 401) {
                $error_message .= '<p style="margin: 0 0 5px 0;">Authentication failed. Possible causes:</p>';
                $error_message .= '<ul style="margin: 5px 0 10px 20px; padding: 0;">';
                $error_message .= '<li>Incorrect Access Key or Secret Key</li>';
                $error_message .= '<li>Credentials expired or revoked</li>';
                $error_message .= '<li>Need to regenerate in Amazon Associates</li>';
                $error_message .= '</ul>';
            }
            
            $error_message .= '<div style="font-family: monospace; font-size: 10px; background: #f8f9fa; padding: 6px; border-radius: 2px; overflow: auto;">';
            $error_message .= 'API: PA-API 5.0 (Legacy)<br>';
            $error_message .= 'Endpoint: ' . esc_html($url) . '<br><br>';
            $error_message .= 'Response: ' . esc_html($error_body);
            $error_message .= '</div>';
            
            $error_message .= '</div>';
            $error_message .= '</details>';
        }
        
        $error_message .= '</div>';
        
        return $error_message;
    }

    $body = wp_remote_retrieve_body($response);
    $data = json_decode($body, true);
    
    if (empty($data)) {
        return '<p>Error: Unable to parse the Amazon server response.</p>';
    }

    if (empty($data['SearchResult']['Items'])) {
        return '<p>No products found.</p>';
    }

    return affiamsh_render_products($data['SearchResult']['Items'], $settings, $image_size_key);
}

/**
 * Funzione per renderizzare i prodotti (comune per entrambe le API)
 */
function affiamsh_render_products($items, $settings, $image_size_key) {
    // Generate HTML
    $num_products = $settings['num_products'] ?? 3;
    $num_columns = $settings['num_columns'] ?? 3;
    $font_size = esc_attr($settings['font_size'] ?? '16px');
    
    // ✅ ENFORCE FREE LIMITS at render time
    $is_pro = affiamsh_is_pro();
    if (!$is_pro) {
        $num_products = min($num_products, 3);  // Max 3 products for FREE
        $num_columns = min($num_columns, 3);    // Max 3 columns for FREE
    }

    // Get PRO options
    $pro_opts = get_option('affiamsh_pro_display_options', [
        'template' => 'card',
        'theme' => 'slate',
        'text_color' => '',
        'title_color' => '',
        'price_color' => ''
    ]);
    
    $template = isset($pro_opts['template']) && !empty($pro_opts['template']) ? $pro_opts['template'] : 'card';
    $theme = isset($pro_opts['theme']) && !empty($pro_opts['theme']) ? $pro_opts['theme'] : 'slate';

    // Build classes
    $container_classes = 'affiamsh-amazon-products template-' . esc_attr($template);
    $container_classes .= ' affiamsh-theme-' . esc_attr($theme);

    // Build inline styles con CSS variables
    $inline_styles = "display: grid; grid-template-columns: repeat(" . esc_attr($num_columns) . ", 1fr); gap: 20px;margin-bottom:20px;";
    
    // Add custom color overrides SOLO se theme è CUSTOM e PRO è attivo
    if ($is_pro && $theme === 'custom') {
        if (!empty($pro_opts['text_color'])) {
            $inline_styles .= " --affiamsh-text: " . esc_attr($pro_opts['text_color']) . " !important;";
        }
        if (!empty($pro_opts['title_color'])) {
            $inline_styles .= " --affiamsh-title: " . esc_attr($pro_opts['title_color']) . " !important;";
        }
        if (!empty($pro_opts['price_color'])) {
            $inline_styles .= " --affiamsh-price: " . esc_attr($pro_opts['price_color']) . " !important;";
        }

        if (!empty($pro_opts['box_bg'])) {
            $inline_styles .= " --affiamsh-bg: " . esc_attr($pro_opts['box_bg']) . " !important;";
        }
        if (!empty($pro_opts['ticket_bg'])) {
            $inline_styles .= " --affiamsh-discount-bg: " . esc_attr($pro_opts['ticket_bg']) . " !important;";
        }
        if (!empty($pro_opts['discount_fg'])) {
            $inline_styles .= " --affiamsh-discount-fg: " . esc_attr($pro_opts['discount_fg']) . " !important;";
        }
        
        if (!empty($pro_opts['box_bg_hover'])) {
            $inline_styles .= " --affiamsh-bg-hover: " . esc_attr($pro_opts['box_bg_hover']) . " !important;";
        }
    }

    $html = '<div class="' . esc_attr($container_classes) . '" style="' . $inline_styles . '">';

    foreach ($items as $index => $item) {
        if ($index >= $num_products) break;
        
        // Supporto per entrambi i formati di naming (camelCase e PascalCase)
        $title = esc_html(
            $item['itemInfo']['title']['displayValue'] ?? 
            $item['ItemInfo']['Title']['DisplayValue'] ?? 
            'Title not available'
        );
        $short_title = (strlen($title) > 50) ? substr($title, 0, 50) . '...' : $title;
        
        $_img_key = strtolower($image_size_key);
        $image = esc_url(
            $item['images']['primary'][$_img_key]['url'] ??
            $item['Images']['Primary'][$image_size_key]['URL'] ??
            ''
        );
        
        $link = esc_url(
            $item['detailPageURL'] ?? 
            $item['DetailPageURL'] ?? 
            '#'
        );
        
        $price =
            $item['offersV2']['listings'][0]['price']['money']['displayAmount'] ??
            $item['offersV2']['listings'][0]['price']['displayAmount'] ??
            $item['offers']['listings'][0]['price']['displayAmount'] ??
            $item['Offers']['Listings'][0]['Price']['DisplayAmount'] ??
            'Price not available';
        
        $percentage =
            $item['offersV2']['listings'][0]['price']['savings']['percentage'] ??
            $item['offers']['listings'][0]['price']['savings']['percentage'] ??
            $item['Offers']['Listings'][0]['Price']['Savings']['Percentage'] ??
            null;

        $html .= '<div class="affiamsh-amazon-product">';
        $html .= '<a href="' . $link . '" target="_blank">';
        $html .= '<img src="' . $image . '" alt="' . $title . '" class="affiamsh-amazon-product-image">';
        $html .= '<div class="affiamsh-amazon-product-title" style="font-size: ' . $font_size . '; font-weight: bold; margin-top: 2px;">' . $short_title . '</div>';
        $html .= '</a>';

        $price_class = 'affiamsh-amazon-product-price';
        
        if ($percentage) {
            $html .= '<p class="' . esc_attr($price_class) . '" style="font-size: ' . $font_size . '; margin: 5px 0;">'
                . '<span class="affiamsh-badge-off">-' . esc_html($percentage) . '%</span> '
                . '<span style="font-weight: bold;">' . esc_html($price) . '</span>'
                . '</p>';
        } else {
            $html .= '<p class="' . esc_attr($price_class) . '" style="font-size: ' . $font_size . '; font-weight: bold; margin: 5px 0;">'
                . esc_html($price)
                . '</p>';
        }

        $html .= '</div>';
    }
    
    $html .= '</div>';

    return $html;
}

/**
 * Classe AwsV4
 */
class Affiamsh_AwsV4 {
    private $accessKey = null;
    private $secretKey = null;
    private $path = null;
    private $regionName = null;
    private $serviceName = null;
    private $httpMethodName = null;
    private $queryParametes = array();
    private $awsHeaders = array();
    private $payload = "";

    private $HMACAlgorithm = "AWS4-HMAC-SHA256";
    private $aws4Request = "aws4_request";
    private $strSignedHeader = null;
    private $xAmzDate = null;
    private $currentDate = null;

    public function __construct($accessKey, $secretKey) {
        $this->accessKey = $accessKey;
        $this->secretKey = $secretKey;
        $this->xAmzDate = $this->getTimeStamp();
        $this->currentDate = $this->getDate();
    }

    function setPath($path) {
        $this->path = $path;
    }

    function setServiceName($serviceName) {
        $this->serviceName = $serviceName;
    }

    function setRegionName($regionName) {
        $this->regionName = $regionName;
    }

    function setPayload($payload) {
        $this->payload = $payload;
    }

    function setRequestMethod($method) {
        $this->httpMethodName = $method;
    }

    function addHeader($headerName, $headerValue) {
        $this->awsHeaders[$headerName] = $headerValue;
    }

    private function prepareCanonicalRequest() {
        $canonicalURL = "";
        $canonicalURL .= $this->httpMethodName . "\n";
        $canonicalURL .= $this->path . "\n" . "\n";
        $signedHeaders = '';
        foreach ($this->awsHeaders as $key => $value) {
            $signedHeaders .= $key . ";";
            $canonicalURL .= $key . ":" . $value . "\n";
        }
        $canonicalURL .= "\n";
        $this->strSignedHeader = substr($signedHeaders, 0, -1);
        $canonicalURL .= $this->strSignedHeader . "\n";
        $canonicalURL .= $this->generateHex($this->payload);
        return $canonicalURL;
    }

    private function prepareStringToSign($canonicalURL) {
        $stringToSign = '';
        $stringToSign .= $this->HMACAlgorithm . "\n";
        $stringToSign .= $this->xAmzDate . "\n";
        $stringToSign .= $this->currentDate . "/" . $this->regionName . "/" . $this->serviceName . "/" . $this->aws4Request . "\n";
        $stringToSign .= $this->generateHex($canonicalURL);
        return $stringToSign;
    }

    private function calculateSignature($stringToSign) {
        $signatureKey = $this->getSignatureKey($this->secretKey, $this->currentDate, $this->regionName, $this->serviceName);
        $signature = hash_hmac("sha256", $stringToSign, $signatureKey, true);
        $strHexSignature = strtolower(bin2hex($signature));
        return $strHexSignature;
    }

    public function getHeaders() {
        $this->awsHeaders['x-amz-date'] = $this->xAmzDate;
        ksort($this->awsHeaders);

        $canonicalURL = $this->prepareCanonicalRequest();
        $stringToSign = $this->prepareStringToSign($canonicalURL);
        $signature = $this->calculateSignature($stringToSign);

        if ($signature) {
            $this->awsHeaders['Authorization'] = $this->buildAuthorizationString($signature);
            return $this->awsHeaders;
        }
    }

    private function buildAuthorizationString($strSignature) {
        return $this->HMACAlgorithm . " " . "Credential=" . $this->accessKey . "/" . $this->getDate() . "/" . $this->regionName . "/" . $this->serviceName . "/" . $this->aws4Request . "," . "SignedHeaders=" . $this->strSignedHeader . "," . "Signature=" . $strSignature;
    }

    private function generateHex($data) {
        return strtolower(bin2hex(hash("sha256", $data, true)));
    }

    private function getSignatureKey($key, $date, $regionName, $serviceName) {
        $kSecret = "AWS4" . $key;
        $kDate = hash_hmac("sha256", $date, $kSecret, true);
        $kRegion = hash_hmac("sha256", $regionName, $kDate, true);
        $kService = hash_hmac("sha256", $serviceName, $kRegion, true);
        $kSigning = hash_hmac("sha256", $this->aws4Request, $kService, true);

        return $kSigning;
    }

    private function getTimeStamp() {
        return gmdate("Ymd\THis\Z");
    }

    private function getDate() {
        return gmdate("Ymd");
    }
}

// === PRO Licensing & Display Options ===
if (!defined('AFFIAMSH_PRO_KEY_PLAIN')) {
    define('AFFIAMSH_PRO_KEY_PLAIN', 'AMSH1899271');
}
if (!function_exists('affiamsh_is_pro')) {
    function affiamsh_is_pro(): bool {
        return (bool) get_option('affiamsh_is_pro', false);
    }
}

add_action('admin_menu', function () {
    add_submenu_page(
        'affiamsh-amazon-api-settings',
        __('Activate PRO', 'affiliate-amazon-shortcode'),
        __('Activate PRO', 'affiliate-amazon-shortcode'),
        'manage_options',
        'affiamsh-activate-pro',
        'affiamsh_pro_activation_page'
    );
    add_submenu_page(
        'affiamsh-amazon-api-settings',
        __('Display (PRO)', 'affiliate-amazon-shortcode'),
        __('Display (PRO)', 'affiliate-amazon-shortcode'),
        'manage_options',
        'affiamsh-pro-display',
        'affiamsh_pro_display_settings_page'
    );
});

add_action('admin_init', function () {
    if (!isset($_POST['affiamsh_activate_pro'])) { return; }
    if (!current_user_can('manage_options')) { return; }
    check_admin_referer('affiamsh_activate_pro');
    $key = isset($_POST['affiamsh_license_key']) ? sanitize_text_field( wp_unslash($_POST['affiamsh_license_key']) ) : '';
    if (hash_equals(AFFIAMSH_PRO_KEY_PLAIN, $key)) {
        update_option('affiamsh_is_pro', 1);
        update_option('affiamsh_license_key', $key);
        add_settings_error('affiamsh_pro', 'pro_ok', __('PRO version successful activated.', 'affiliate-amazon-shortcode'), 'updated');
    } else {
        update_option('affiamsh_is_pro', 0);
        add_settings_error('affiamsh_pro', 'pro_ko', __('License Code Invalid.', 'affiliate-amazon-shortcode'), 'error');
    }
});

add_action('admin_init', function () {
    register_setting('affiamsh_pro_display_group', 'affiamsh_pro_display_options', function ($value) {
        $out = [
            'template'    => 'card',
            'theme'       => 'slate',
            'text_color'  => '',
            'title_color' => '',
            'price_color' => '',
            'box_bg'      => '',
            'ticket_bg'   => '',
            'discount_fg' => '',
            'box_bg_hover' => '',
        ];
        if (is_array($value)) {
            $tpl = isset($value['template']) ? sanitize_text_field($value['template']) : 'card';
            $out['template'] = in_array($tpl, ['card','list'], true) ? $tpl : 'card';

            $allowed_themes = ['slate','blue','emerald','amber','rose','violet','indigo','teal','zinc','custom'];
            $th = isset($value['theme']) ? sanitize_text_field($value['theme']) : 'slate';
            if (!in_array($th, $allowed_themes, true)) { $th = 'slate'; }
            if (!affiamsh_is_pro()) { $th = 'slate'; }
            $out['theme'] = $th;

            if ($th === 'custom') {
                foreach (['text_color','title_color','price_color','box_bg','ticket_bg','discount_fg','box_bg_hover'] as $k) {
                    $c = isset($value[$k]) ? sanitize_text_field($value[$k]) : '';
                    if ($c && preg_match('/^#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$/', $c)) {
                        $out[$k] = $c;
                    }
                }
            } else {
                $out['text_color'] = '';
                $out['title_color'] = '';
                $out['price_color'] = '';
                $out['box_bg'] = '';
                $out['ticket_bg'] = '';
                $out['discount_fg'] = '';
                $out['box_bg_hover'] = ''; 
            }
        }
        return $out;
    });
});

function affiamsh_pro_activation_page() {
    ?>
    <div class="wrap">
        <h1><?php esc_html_e('Activate PRO', 'affiliate-amazon-shortcode'); ?></h1>
        <?php settings_errors('affiamsh_pro'); ?>
        <?php if (affiamsh_is_pro()): ?>
            <p><strong>✅ <?php esc_html_e('PRO attiva.', 'affiliate-amazon-shortcode'); ?></strong></p>
            <p><a href="<?php echo esc_url( wp_nonce_url( admin_url('admin-post.php?action=affiamsh_reset_pro'), 'affiamsh_reset_pro' ) ); ?>" class="button-secondary"><?php esc_html_e('Reset (Back to FREE)', 'affiliate-amazon-shortcode'); ?></a></p><p><?php esc_html_e('Hide watermark and enable custom design options', 'affiliate-amazon-shortcode'); ?></p>
        <?php else: ?>
            <form method="post">
                <?php wp_nonce_field('affiamsh_activate_pro'); ?>
                <table class="form-table">
                    <tr>
                        <th scope="row"><label for="affiamsh_license_key"><?php esc_html_e('License Code', 'affiliate-amazon-shortcode'); ?></label></th>
                        <td><input type="text" id="affiamsh_license_key" name="affiamsh_license_key" class="regular-text" placeholder="AMSH012345678" /></td>
                    </tr>
                </table>
                <p class="submit">
                    <button type="submit" class="button button-primary" name="affiamsh_activate_pro" value="1"><?php esc_html_e('Activate', 'affiliate-amazon-shortcode'); ?></button>
                    <a class="button" rel="noopener nofollow sponsored" target="_blank" href="https://softwareapp.it/affiliate-amazon-shortcode/"><?php esc_html_e('Purchase PRO version', 'affiliate-amazon-shortcode'); ?></a>
                </p>
            </form>
        <?php endif; ?>
    </div>
    <?php
}

function affiamsh_pro_display_settings_page() {
    $opts = get_option('affiamsh_pro_display_options', [
        'template'    => 'card',
        'theme'       => 'slate',
        'text_color'  => '',
        'title_color' => '',
        'price_color' => '',
        'box_bg'      => '',
        'ticket_bg'   => '',
        'discount_fg' => '',
        'box_bg_hover' => '',
    ]);
    $theme = isset($opts['theme']) ? $opts['theme'] : 'slate';
    $is_pro = affiamsh_is_pro();
    $show_colors = ($theme === 'custom');
    ?>
    <div class="wrap">
        <h1><?php esc_html_e('Display (PRO)', 'affiliate-amazon-shortcode'); ?></h1>
        <?php if (!$is_pro): ?>
            <p><?php esc_html_e('Queste opzioni si attivano solo con la versione PRO.', 'affiliate-amazon-shortcode'); ?></p>
        <?php endif; ?>
        <form method="post" action="options.php">
            <?php settings_fields('affiamsh_pro_display_group'); ?>
            <table class="form-table">
                <tr>
                    <th scope="row"><?php esc_html_e('Template', 'affiliate-amazon-shortcode'); ?></th>
                    <td>
                        <select name="affiamsh_pro_display_options[template]" <?php disabled(!$is_pro); ?>>
                            <option value="card" <?php selected($opts['template'], 'card'); ?>>Card</option>
                            <option value="list" <?php selected($opts['template'], 'list'); ?>>List</option>
                        </select>
                        <?php if (!$is_pro): ?><p class="description"><?php esc_html_e('Available in PRO version Card and List style', 'affiliate-amazon-shortcode'); ?></p><?php endif; ?>
                    </td>
                </tr>
                <tr>
                    <th scope="row"><label for="affiamsh_theme"><?php esc_html_e('Theme', 'affiliate-amazon-shortcode'); ?></label></th>
                    <td>
                        <select id="affiamsh_theme" name="affiamsh_pro_display_options[theme]" onchange="affiamsh_toggle_color_fields()" <?php disabled(!$is_pro); ?>>
                            <option value="slate" <?php selected($theme, 'slate'); ?>>Default</option>
                            <option value="blue" <?php selected($theme, 'blue'); ?>>Blue</option>
                            <option value="emerald" <?php selected($theme, 'emerald'); ?>>Emerald</option>
                            <option value="amber" <?php selected($theme, 'amber'); ?>>Amber</option>
                            <option value="rose" <?php selected($theme, 'rose'); ?>>Rose</option>
                            <option value="violet" <?php selected($theme, 'violet'); ?>>Violet</option>
                            <option value="indigo" <?php selected($theme, 'indigo'); ?>>Indigo</option>
                            <option value="teal" <?php selected($theme, 'teal'); ?>>Teal</option>
                            <option value="zinc" <?php selected($theme, 'zinc'); ?>>Zinc</option>
                            <option value="custom" <?php selected($theme, 'custom'); ?>>Custom</option>
                        </select>
                        <p class="description"><?php esc_html_e('Browse ready Themes or select "Custom" to customize all colors', 'affiliate-amazon-shortcode'); ?></p>
                    </td>
                </tr>
                <tr id="affiamsh-color-fields" style="<?php echo $show_colors ? '' : 'display:none;'; ?>">
                    <td colspan="2">
                        <h3><?php esc_html_e('Custom Style Colors', 'affiliate-amazon-shortcode'); ?></h3>
                    </td>
                </tr>
                <tr id="affiamsh-text-color-row" style="<?php echo $show_colors ? '' : 'display:none;'; ?>">
                    <th scope="row"><?php esc_html_e('Text Color', 'affiliate-amazon-shortcode'); ?></th>
                    <td>
                        <input type="text" name="affiamsh_pro_display_options[text_color]" value="<?php echo esc_attr($opts['text_color']); ?>" class="regular-text affiamsh-color-input" placeholder="#333333" />
                        <p class="description">Es. #333333</p>
                    </td>
                </tr>
                <tr id="affiamsh-title-color-row" style="<?php echo $show_colors ? '' : 'display:none;'; ?>">
                    <th scope="row"><?php esc_html_e('Title Color', 'affiliate-amazon-shortcode'); ?></th>
                    <td>
                        <input type="text" name="affiamsh_pro_display_options[title_color]" value="<?php echo esc_attr($opts['title_color']); ?>" class="regular-text affiamsh-color-input" placeholder="#111111" />
                        <p class="description">Es. #111111</p>
                    </td>
                </tr>
                <tr id="affiamsh-price-color-row" style="<?php echo $show_colors ? '' : 'display:none;'; ?>">
                    <th scope="row"><?php esc_html_e('Price Color', 'affiliate-amazon-shortcode'); ?></th>
                    <td>
                        <input type="text" name="affiamsh_pro_display_options[price_color]" value="<?php echo esc_attr($opts['price_color']); ?>" class="regular-text affiamsh-color-input" placeholder="#b12704" />
                        <p class="description">Es. #b12704</p>
                    </td>
                </tr>
                <tr id="affiamsh_box_bg" style="<?php echo $show_colors ? '' : 'display:none;'; ?>">
                    <th scope="row"><?php esc_html_e('Box Background', 'affiliate-amazon-shortcode'); ?></th>
                    <td>
                        <input type="text" name="affiamsh_pro_display_options[box_bg]" value="<?php echo esc_attr($opts['box_bg']); ?>" class="regular-text affiamsh-color-input" placeholder="#ffffff" />
                        <p class="description">Es. #ffffff</p>
                    </td>
                </tr>
                <tr id="affiamsh_box_bg_hover" style="<?php echo $show_colors ? '' : 'display:none;'; ?>">
                    <th scope="row"><?php esc_html_e('Box Hover Background', 'affiliate-amazon-shortcode'); ?></th>
                    <td>
                        <input type="text" name="affiamsh_pro_display_options[box_bg_hover]" value="<?php echo esc_attr($opts['box_bg_hover']); ?>" class="regular-text affiamsh-color-input" placeholder="#f8fafc" />
                        <p class="description">E.g. #f8fafc</p>
                    </td>
                </tr>
                <tr id="affiamsh_ticket_bg" style="<?php echo $show_colors ? '' : 'display:none;'; ?>">
                    <th scope="row"><?php esc_html_e('Ticket Background', 'affiliate-amazon-shortcode'); ?></th>
                    <td>
                        <input type="text" name="affiamsh_pro_display_options[ticket_bg]" value="<?php echo esc_attr($opts['ticket_bg']); ?>" class="regular-text affiamsh-color-input" placeholder="#fff1f2" />
                        <p class="description">Es. #fff1f2</p>
                    </td>
                </tr>
                <tr id="affiamsh_discount_fg" style="<?php echo $show_colors ? '' : 'display:none;'; ?>">
                    <th scope="row"><?php esc_html_e('Discount Color', 'affiliate-amazon-shortcode'); ?></th>
                    <td>
                        <input type="text" name="affiamsh_pro_display_options[discount_fg]" value="<?php echo esc_attr($opts['discount_fg']); ?>" class="regular-text affiamsh-color-input" placeholder="#be123c" />
                        <p class="description">Es. #be123c</p>
                    </td>
                </tr>   
            </table>
            <?php submit_button(); ?>
        </form>
    </div>

    <script>
    function affiamsh_toggle_color_fields() {
        var theme = document.getElementById('affiamsh_theme').value;
        var colorFields = document.getElementById('affiamsh-color-fields');
        var textColorRow = document.getElementById('affiamsh-text-color-row');
        var titleColorRow = document.getElementById('affiamsh-title-color-row');
        var priceColorRow = document.getElementById('affiamsh-price-color-row');
        var boxBgRow = document.getElementById('affiamsh_box_bg');
        var ticketBgRow = document.getElementById('affiamsh_ticket_bg');
        var discountFgRow = document.getElementById('affiamsh_discount_fg');
        var boxBgHoverRow = document.getElementById('affiamsh_box_bg_hover');

        if (theme === 'custom') {
            colorFields.style.display = '';
            textColorRow.style.display = '';
            titleColorRow.style.display = '';
            priceColorRow.style.display = '';
            boxBgRow.style.display = '';
            ticketBgRow.style.display = '';
            discountFgRow.style.display = '';
            boxBgHoverRow.style.display = '';
        } else {
            colorFields.style.display = 'none';
            textColorRow.style.display = 'none';
            titleColorRow.style.display = 'none';
            priceColorRow.style.display = 'none';
            boxBgRow.style.display = 'none';
            ticketBgRow.style.display = 'none';
            discountFgRow.style.display = 'none';
            boxBgHoverRow.style.display = 'none';
        }
    }
    </script>
    <?php
}

add_filter('plugin_action_links_' . plugin_basename(__FILE__), function($links){
    $links[] = '<a href="'. esc_url(admin_url('admin.php?page=affiamsh-amazon-api-settings')) .'">'.esc_html__('Settings','affiliate-amazon-shortcode').'</a>';
    $links[] = '<a href="'. esc_url(admin_url('admin.php?page=affiamsh-activate-pro')) .'">'.esc_html__('Activate PRO','affiliate-amazon-shortcode').'</a>';
    $links[] = '<a target="_blank" rel="noopener nofollow sponsored" href="https://softwareapp.it/affiliate-amazon-shortcode/">'.esc_html__('Purchase PRO','affiliate-amazon-shortcode').'</a>';
    return $links;
});

add_action('admin_post_affiamsh_reset_pro', function () {
    if (!current_user_can('manage_options')) { 
        wp_die( esc_html__( 'Forbidden', 'affiliate-amazon-shortcode' ) );
    }
    check_admin_referer('affiamsh_reset_pro');
    delete_option('affiamsh_is_pro');
    add_settings_error('affiamsh_pro', 'pro_reset', __('PRO disabled. You are in FREE version.', 'affiliate-amazon-shortcode'), 'updated');
    wp_redirect( admin_url('admin.php?page=affiamsh-activate-pro') );
    exit;
});

add_action('wp_enqueue_scripts', function () {
    wp_register_script('affiamsh-frontend', '', [], AFFIAMSH_VER, true);
    wp_enqueue_script('affiamsh-frontend');

    $opts = get_option('affiamsh_pro_display_options', []);

    $data = [
        'isPro'    => affiamsh_is_pro() ? 1 : 0,
        'template' => isset($opts['template']) ? $opts['template'] : 'default',
        'theme'    => isset($opts['theme']) ? $opts['theme'] : 'slate',
    ];

    $js = '(function(d,w){try{var CFG=' . wp_json_encode($data) . ';'
        . 'function injectWatermark(){'
        . 'if(CFG.isPro){return;}'
        . 'var wrappers=d.querySelectorAll(".affiamsh-amazon-products");'
        . 'wrappers.forEach(function(w){'
        . 'if(w.querySelector(".affiamsh-watermark"))return;'
        . 'var wm=d.createElement("span");'
        . 'wm.className="affiamsh-watermark";'
        . 'wm.setAttribute("aria-hidden","true");'
        . 'wm.textContent="Made with Affiliate Amazon Shortcode Plugin";'
        . 'w.appendChild(wm);'
        . 'try{'
        . 'var cs=w.ownerDocument.defaultView.getComputedStyle(w);'
        . 'if(!cs||cs.position==="static"){w.style.position="relative";}'
        . '}catch(e){if(!w.style.position){w.style.position="relative";}}'
        . '});'
        . '}'
        . 'injectWatermark();'
        . 'w.addEventListener("load",injectWatermark);'
        . '}catch(e){}})(document,window);';

    wp_add_inline_script('affiamsh-frontend', $js);
}, 40);

?>