<?php
/**
 * Plugin Name: AgentoWine - AI Wine Assistant
 * Description: Adds the AgentoWine AI chatbot to your site — your virtual AI sommelier for wineries and wine e-commerce.
 * Version: 1.1.3
 * Requires at least: 5.0
 * Requires PHP: 7.4
 * Author: AgentoWine
 * Author URI: https://agentowine.com
 * License: GPL v2 or later
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain: agentowine-chatbot
 * Domain Path: /languages
 */

// Impedisce l'accesso diretto al file
if (!defined('ABSPATH')) {
    exit;
}

// Definisce le costanti del plugin
define('AGENTOWINE_CHATBOT_VERSION', '1.1.3');
define('AGENTOWINE_CHATBOT_PLUGIN_DIR', plugin_dir_path(__FILE__));
define('AGENTOWINE_CHATBOT_PLUGIN_URL', plugin_dir_url(__FILE__));
define('AGENTOWINE_CHATBOT_SCRIPT_URL', 'https://chatbot.agentowine.com/chatbot.js');

/**
 * Classe principale del plugin AgentoWine Chatbot
 */
class AgentoWine_Chatbot {

    /**
     * Istanza singleton
     */
    private static $instance = null;

    /**
     * Ottiene l'istanza singleton
     */
    public static function get_instance() {
        if (null === self::$instance) {
            self::$instance = new self();
        }
        return self::$instance;
    }

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

    /**
     * Inizializza gli hook di WordPress
     */
    private function init_hooks() {
        // Hook per l'admin
        add_action('admin_menu', array($this, 'add_admin_menu'));
        add_action('admin_init', array($this, 'register_settings'));
        add_action('admin_enqueue_scripts', array($this, 'admin_enqueue_scripts'));

        // Hook per il frontend
        add_action('wp_enqueue_scripts', array($this, 'enqueue_chatbot_script'));

        // Hook per i link del plugin
        add_filter('plugin_action_links_' . plugin_basename(__FILE__), array($this, 'add_plugin_action_links'));
    }

    /**
     * Aggiunge il menu di amministrazione
     */
    public function add_admin_menu() {
        add_options_page(
            __('AgentoWine Chatbot', 'agentowine-chatbot'),
            __('AgentoWine Chatbot', 'agentowine-chatbot'),
            'manage_options',
            'agentowine-chatbot',
            array($this, 'render_settings_page')
        );
    }

    /**
     * Registra le impostazioni
     */
    public function register_settings() {
        // Registra Client ID
        register_setting(
            'agentowine_chatbot_settings',
            'agentowine_chatbot_client_id',
            array(
                'type' => 'string',
                'sanitize_callback' => 'sanitize_text_field',
                'default' => ''
            )
        );

        // Registra Posizione
        register_setting(
            'agentowine_chatbot_settings',
            'agentowine_chatbot_position',
            array(
                'type' => 'string',
                'sanitize_callback' => array($this, 'sanitize_position'),
                'default' => 'bottom-right'
            )
        );

        // Registra Posizione Personalizzata (abilitata/disabilitata)
        register_setting(
            'agentowine_chatbot_settings',
            'agentowine_chatbot_custom_position',
            array(
                'type' => 'boolean',
                'sanitize_callback' => array($this, 'sanitize_custom_position_enabled'),
                'default' => false
            )
        );

        // Registra coordinate Desktop
        register_setting(
            'agentowine_chatbot_settings',
            'agentowine_chatbot_custom_position_desktop',
            array(
                'type' => 'array',
                'sanitize_callback' => array($this, 'sanitize_position_coords'),
                'default' => array('top' => '', 'bottom' => '24', 'left' => '', 'right' => '24')
            )
        );

        // Registra coordinate Mobile
        register_setting(
            'agentowine_chatbot_settings',
            'agentowine_chatbot_custom_position_mobile',
            array(
                'type' => 'array',
                'sanitize_callback' => array($this, 'sanitize_position_coords'),
                'default' => array('top' => '', 'bottom' => '16', 'left' => '', 'right' => '16')
            )
        );

        add_settings_section(
            'agentowine_chatbot_main_section',
            __('Configurazione Chatbot', 'agentowine-chatbot'),
            array($this, 'render_section_description'),
            'agentowine-chatbot'
        );

        add_settings_field(
            'agentowine_chatbot_client_id',
            __('Client ID', 'agentowine-chatbot'),
            array($this, 'render_client_id_field'),
            'agentowine-chatbot',
            'agentowine_chatbot_main_section'
        );

        add_settings_field(
            'agentowine_chatbot_position',
            __('Posizione', 'agentowine-chatbot'),
            array($this, 'render_position_field'),
            'agentowine-chatbot',
            'agentowine_chatbot_main_section'
        );
    }

    /**
     * Sanitizza il valore della posizione
     */
    public function sanitize_position($value) {
        $valid_positions = array('bottom-right', 'bottom-left', 'top-right', 'top-left', 'custom');
        return in_array($value, $valid_positions) ? $value : 'bottom-right';
    }

    /**
     * Sanitizza il flag posizione personalizzata
     */
    public function sanitize_custom_position_enabled($value) {
        return (bool) $value;
    }

    /**
     * Sanitizza le coordinate di posizione (desktop o mobile)
     */
    public function sanitize_position_coords($value) {
        if (!is_array($value)) {
            return array('top' => '', 'bottom' => '24', 'left' => '', 'right' => '24');
        }
        $sanitized = array();
        foreach (array('top', 'bottom', 'left', 'right') as $key) {
            $val = isset($value[$key]) ? trim($value[$key]) : '';
            if ($val === '') {
                $sanitized[$key] = '';
            } else {
                $num = intval($val);
                $sanitized[$key] = $num >= 0 ? (string) $num : '';
            }
        }
        return $sanitized;
    }

    /**
     * Descrizione della sezione
     */
    public function render_section_description() {
        echo '<p>' . esc_html__('Inserisci il tuo Client ID per attivare il chatbot AgentoWine sul tuo sito.', 'agentowine-chatbot') . '</p>';
    }

    /**
     * Campo Client ID
     */
    public function render_client_id_field() {
        $client_id = get_option('agentowine_chatbot_client_id', '');
        ?>
        <input 
            type="text" 
            name="agentowine_chatbot_client_id" 
            id="agentowine_chatbot_client_id" 
            value="<?php echo esc_attr($client_id); ?>" 
            class="regular-text"
            placeholder="es. a3680d27-fd23-49f6-ab93-c1c9fd081bad"
        />
        <p class="description">
            <?php esc_html_e('Il Client ID ti viene fornito da AgentoWine quando attivi il servizio.', 'agentowine-chatbot'); ?>
        </p>
        <?php
    }

    /**
     * Campo Posizione
     */
    public function render_position_field() {
        $position = get_option('agentowine_chatbot_position', 'bottom-right');
        $custom_enabled = get_option('agentowine_chatbot_custom_position', false);
        $desktop = get_option('agentowine_chatbot_custom_position_desktop',
            array('top' => '', 'bottom' => '24', 'left' => '', 'right' => '24'));
        $mobile = get_option('agentowine_chatbot_custom_position_mobile',
            array('top' => '', 'bottom' => '16', 'left' => '', 'right' => '16'));

        $positions = array(
            'bottom-right' => __('In basso a destra', 'agentowine-chatbot'),
            'bottom-left'  => __('In basso a sinistra', 'agentowine-chatbot'),
            'top-right'    => __('In alto a destra', 'agentowine-chatbot'),
            'top-left'     => __('In alto a sinistra', 'agentowine-chatbot'),
        );
        ?>
        <!-- Dropdown posizioni predefinite (nascosto quando custom è attivo) -->
        <div id="agentowine-preset-position" style="<?php echo $custom_enabled ? 'display:none;' : ''; ?>">
            <select
                name="agentowine_chatbot_position"
                id="agentowine_chatbot_position"
                <?php echo $custom_enabled ? 'disabled' : ''; ?>
            >
                <?php foreach ($positions as $value => $label): ?>
                    <option value="<?php echo esc_attr($value); ?>" <?php selected($position, $value); ?>>
                        <?php echo esc_html($label); ?>
                    </option>
                <?php endforeach; ?>
            </select>
            <p class="description">
                <?php esc_html_e('Scegli dove posizionare il pulsante del chatbot sullo schermo.', 'agentowine-chatbot'); ?>
            </p>
        </div>

        <!-- Checkbox posizione personalizzata -->
        <label style="display:block; margin-top:10px;">
            <input type="checkbox"
                   name="agentowine_chatbot_custom_position"
                   id="agentowine_chatbot_custom_position"
                   value="1"
                   <?php checked($custom_enabled, true); ?> />
            <?php esc_html_e('Posizione personalizzata', 'agentowine-chatbot'); ?>
        </label>

        <!-- Input hidden per forzare position=custom quando il checkbox è attivo -->
        <input type="hidden"
               name="agentowine_chatbot_position"
               id="agentowine_chatbot_position_hidden"
               value="custom"
               <?php echo $custom_enabled ? '' : 'disabled'; ?> />

        <!-- Campi coordinate personalizzate -->
        <div id="agentowine-custom-position-fields" style="<?php echo $custom_enabled ? '' : 'display:none;'; ?> margin-top:15px;">
            <p><strong><?php esc_html_e('Desktop (px)', 'agentowine-chatbot'); ?></strong></p>
            <table class="agentowine-coords-table">
                <tr>
                    <td>
                        <label>Top</label>
                        <input type="number" name="agentowine_chatbot_custom_position_desktop[top]" value="<?php echo esc_attr($desktop['top']); ?>" min="0" style="width:80px;" placeholder="—" />
                    </td>
                    <td>
                        <label>Bottom</label>
                        <input type="number" name="agentowine_chatbot_custom_position_desktop[bottom]" value="<?php echo esc_attr($desktop['bottom']); ?>" min="0" style="width:80px;" placeholder="—" />
                    </td>
                    <td>
                        <label>Left</label>
                        <input type="number" name="agentowine_chatbot_custom_position_desktop[left]" value="<?php echo esc_attr($desktop['left']); ?>" min="0" style="width:80px;" placeholder="—" />
                    </td>
                    <td>
                        <label>Right</label>
                        <input type="number" name="agentowine_chatbot_custom_position_desktop[right]" value="<?php echo esc_attr($desktop['right']); ?>" min="0" style="width:80px;" placeholder="—" />
                    </td>
                </tr>
            </table>

            <p style="margin-top:12px;"><strong><?php esc_html_e('Mobile (px)', 'agentowine-chatbot'); ?></strong></p>
            <table class="agentowine-coords-table">
                <tr>
                    <td>
                        <label>Top</label>
                        <input type="number" name="agentowine_chatbot_custom_position_mobile[top]" value="<?php echo esc_attr($mobile['top']); ?>" min="0" style="width:80px;" placeholder="—" />
                    </td>
                    <td>
                        <label>Bottom</label>
                        <input type="number" name="agentowine_chatbot_custom_position_mobile[bottom]" value="<?php echo esc_attr($mobile['bottom']); ?>" min="0" style="width:80px;" placeholder="—" />
                    </td>
                    <td>
                        <label>Left</label>
                        <input type="number" name="agentowine_chatbot_custom_position_mobile[left]" value="<?php echo esc_attr($mobile['left']); ?>" min="0" style="width:80px;" placeholder="—" />
                    </td>
                    <td>
                        <label>Right</label>
                        <input type="number" name="agentowine_chatbot_custom_position_mobile[right]" value="<?php echo esc_attr($mobile['right']); ?>" min="0" style="width:80px;" placeholder="—" />
                    </td>
                </tr>
            </table>

            <p class="description">
                <?php esc_html_e('Lascia vuoto un campo per non impostare quella direzione. Specifica almeno un valore verticale (top o bottom) e uno orizzontale (left o right).', 'agentowine-chatbot'); ?>
            </p>
        </div>
        <?php
    }

    /**
     * Renderizza la pagina delle impostazioni
     */
    public function render_settings_page() {
        if (!current_user_can('manage_options')) {
            return;
        }

        // Mostra messaggi di successo dopo il salvataggio
        // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- lettura in sola visualizzazione del flag della Settings API.
        if (isset($_GET['settings-updated'])) {
            add_settings_error(
                'agentowine_chatbot_messages',
                'agentowine_chatbot_message',
                __('Impostazioni salvate con successo!', 'agentowine-chatbot'),
                'updated'
            );
        }
        ?>
        <div class="wrap agentowine-chatbot-settings">
            <div class="agentowine-chatbot-header">
                <img
                    src="<?php echo esc_url(AGENTOWINE_CHATBOT_PLUGIN_URL . 'assets/banner.jpeg'); ?>"
                    alt="<?php esc_attr_e('AgentoWine', 'agentowine-chatbot'); ?>"
                    class="agentowine-banner"
                />
            </div>
            <p class="agentowine-subtitle"><?php esc_html_e('Il tuo sommelier virtuale AI per la cantina', 'agentowine-chatbot'); ?></p>

            <?php settings_errors('agentowine_chatbot_messages'); ?>

            <form action="options.php" method="post">
                <?php
                settings_fields('agentowine_chatbot_settings');
                do_settings_sections('agentowine-chatbot');
                submit_button(__('Salva Impostazioni', 'agentowine-chatbot'));
                ?>
            </form>

            <?php $this->render_status_box(); ?>

            <div class="agentowine-chatbot-help">
                <h3><?php esc_html_e('Hai bisogno di aiuto?', 'agentowine-chatbot'); ?></h3>
                <p>
                    <?php esc_html_e('Per ottenere il tuo Client ID o per qualsiasi domanda, visita', 'agentowine-chatbot'); ?>
                    <a href="https://agentowine.com" target="_blank" rel="noopener noreferrer">agentowine.com</a>
                    <?php esc_html_e('o contattaci a', 'agentowine-chatbot'); ?>
                    <a href="mailto:info@agentowine.com">info@agentowine.com</a>
                </p>
            </div>
        </div>
        <?php
    }

    /**
     * Mostra lo stato del chatbot
     */
    private function render_status_box() {
        $client_id = get_option('agentowine_chatbot_client_id', '');
        $position = get_option('agentowine_chatbot_position', 'bottom-right');
        $is_active = !empty($client_id);

        $position_labels = array(
            'bottom-right' => __('In basso a destra', 'agentowine-chatbot'),
            'bottom-left'  => __('In basso a sinistra', 'agentowine-chatbot'),
            'top-right'    => __('In alto a destra', 'agentowine-chatbot'),
            'top-left'     => __('In alto a sinistra', 'agentowine-chatbot'),
            'custom'       => __('Personalizzata', 'agentowine-chatbot'),
        );
        ?>
        <div class="agentowine-status-box <?php echo $is_active ? 'active' : 'inactive'; ?>">
            <h3><?php esc_html_e('Stato del Chatbot', 'agentowine-chatbot'); ?></h3>
            <?php if ($is_active): ?>
                <p class="status-indicator active">
                    <span class="dashicons dashicons-yes-alt"></span>
                    <?php esc_html_e('Chatbot attivo e funzionante', 'agentowine-chatbot'); ?>
                </p>
                <p class="client-id-info">
                    <strong><?php esc_html_e('Client ID:', 'agentowine-chatbot'); ?></strong> 
                    <code><?php echo esc_html(substr($client_id, 0, 8) . '...' . substr($client_id, -4)); ?></code>
                </p>
                <p class="position-info">
                    <strong><?php esc_html_e('Posizione:', 'agentowine-chatbot'); ?></strong>
                    <?php echo esc_html($position_labels[$position] ?? $position); ?>
                    <?php if ($position === 'custom'):
                        $cp_desktop = get_option('agentowine_chatbot_custom_position_desktop', array());
                        $cp_mobile = get_option('agentowine_chatbot_custom_position_mobile', array());
                    ?>
                        <br/><small>Desktop: <?php
                            $parts = array();
                            foreach ($cp_desktop as $k => $v) { if ($v !== '') $parts[] = "$k: {$v}px"; }
                            echo esc_html(implode(', ', $parts) ?: '—');
                        ?></small>
                        <br/><small>Mobile: <?php
                            $parts = array();
                            foreach ($cp_mobile as $k => $v) { if ($v !== '') $parts[] = "$k: {$v}px"; }
                            echo esc_html(implode(', ', $parts) ?: '—');
                        ?></small>
                    <?php endif; ?>
                </p>
            <?php else: ?>
                <p class="status-indicator inactive">
                    <span class="dashicons dashicons-warning"></span>
                    <?php esc_html_e('Chatbot non configurato. Inserisci il tuo Client ID per attivarlo.', 'agentowine-chatbot'); ?>
                </p>
            <?php endif; ?>
        </div>
        <?php
    }

    /**
     * Carica gli script e gli stili per l'admin
     */
    public function admin_enqueue_scripts($hook) {
        if ('settings_page_agentowine-chatbot' !== $hook) {
            return;
        }

        wp_add_inline_style('wp-admin', $this->get_admin_styles());

        wp_enqueue_script(
            'agentowine-chatbot-admin',
            AGENTOWINE_CHATBOT_PLUGIN_URL . 'assets/admin.js',
            array(),
            AGENTOWINE_CHATBOT_VERSION,
            true
        );
    }

    /**
     * Restituisce gli stili CSS per l'admin
     */
    private function get_admin_styles() {
        return '
            .agentowine-chatbot-settings {
                max-width: 800px;
            }
            .agentowine-chatbot-header {
                margin-bottom: 12px;
            }
            .agentowine-banner {
                display: block;
                width: 100%;
                max-width: 500px;
                height: auto;
                border-radius: 8px;
            }
            .agentowine-subtitle {
                margin: 0 0 20px;
                color: #666;
            }
            .agentowine-status-box {
                background: #f8f9fa;
                border-left: 4px solid #ccc;
                padding: 15px 20px;
                margin: 20px 0;
                border-radius: 0 8px 8px 0;
            }
            .agentowine-status-box.active {
                background: #ecf7ed;
                border-left-color: #46b450;
            }
            .agentowine-status-box.inactive {
                background: #fff8e5;
                border-left-color: #ffb900;
            }
            .agentowine-status-box h3 {
                margin-top: 0;
            }
            .status-indicator {
                display: flex;
                align-items: center;
                gap: 8px;
                font-weight: 500;
            }
            .status-indicator.active {
                color: #46b450;
            }
            .status-indicator.inactive {
                color: #826200;
            }
            .client-id-info,
            .position-info {
                margin-top: 10px;
            }
            .client-id-info code {
                background: #fff;
                padding: 3px 8px;
                border-radius: 4px;
            }
            .agentowine-chatbot-help {
                background: #f0f0f1;
                padding: 15px 20px;
                border-radius: 8px;
                margin-top: 20px;
            }
            .agentowine-chatbot-help h3 {
                margin-top: 0;
            }
            .agentowine-chatbot-help a {
                color: #722F37;
            }
            .agentowine-coords-table td {
                padding: 4px 8px 4px 0;
            }
            .agentowine-coords-table label {
                display: block;
                font-size: 12px;
                color: #666;
                margin-bottom: 2px;
            }
        ';
    }

    /**
     * Accoda lo script del chatbot nel frontend
     */
    public function enqueue_chatbot_script() {
        $client_id = get_option('agentowine_chatbot_client_id', '');

        // Non caricare nulla se non c'è il Client ID
        if (empty($client_id)) {
            return;
        }

        wp_enqueue_script(
            'agentowine-chatbot',
            AGENTOWINE_CHATBOT_SCRIPT_URL,
            array(),
            AGENTOWINE_CHATBOT_VERSION,
            true
        );

        // Ottieni la posizione configurata
        $position = get_option('agentowine_chatbot_position', 'bottom-right');

        // Costruisci oggetto configurazione
        $config = array(
            'position' => $position,
            'theme'    => 'light',
            'clientId' => $client_id,
        );

        // Aggiungi dati posizione personalizzata se abilitata
        if ($position === 'custom') {
            $desktop = get_option('agentowine_chatbot_custom_position_desktop',
                array('top' => '', 'bottom' => '24', 'left' => '', 'right' => '24'));
            $mobile = get_option('agentowine_chatbot_custom_position_mobile',
                array('top' => '', 'bottom' => '16', 'left' => '', 'right' => '16'));
            $config['customPosition'] = array(
                'desktop' => $desktop,
                'mobile'  => $mobile,
            );
        }

        $inline_script = sprintf(
            'document.addEventListener("DOMContentLoaded", function() { if (window.Chatbot) { window.Chatbot.init(%s); } });',
            wp_json_encode($config)
        );
        wp_add_inline_script('agentowine-chatbot', $inline_script, 'after');
    }

    /**
     * Aggiunge link alle azioni del plugin
     */
    public function add_plugin_action_links($links) {
        $settings_link = '<a href="' . esc_url(admin_url('options-general.php?page=agentowine-chatbot')) . '">' . esc_html__('Impostazioni', 'agentowine-chatbot') . '</a>';
        array_unshift($links, $settings_link);
        return $links;
    }
}

// Inizializza il plugin
function agentowine_chatbot_init() {
    return AgentoWine_Chatbot::get_instance();
}
add_action('plugins_loaded', 'agentowine_chatbot_init');

/**
 * Attivazione del plugin
 */
function agentowine_chatbot_activate() {
    // Nessuna azione speciale richiesta all'attivazione
}
register_activation_hook(__FILE__, 'agentowine_chatbot_activate');

/**
 * Disattivazione del plugin
 */
function agentowine_chatbot_deactivate() {
    // Nessuna azione speciale richiesta alla disattivazione
}
register_deactivation_hook(__FILE__, 'agentowine_chatbot_deactivate');

/**
 * Disinstallazione del plugin
 */
function agentowine_chatbot_uninstall() {
    // Rimuove le opzioni salvate
    delete_option('agentowine_chatbot_client_id');
    delete_option('agentowine_chatbot_position');
    delete_option('agentowine_chatbot_custom_position');
    delete_option('agentowine_chatbot_custom_position_desktop');
    delete_option('agentowine_chatbot_custom_position_mobile');
}
register_uninstall_hook(__FILE__, 'agentowine_chatbot_uninstall');