<?php
/**
 * Plugin Name: Aidentity Generative Engine Optimizer
 * Plugin URI: https://www.aidentity.it/
 * Description: Optimize your WordPress content for ChatGPT, Claude, Perplexity and other AI assistants. Automatically generates llms.txt, FAQ Schema and AI-friendly summaries.
 * Version: 1.0.3
 * Requires at least: 5.8
 * Requires PHP: 7.4
 * Author: Aidentity
 * Author URI: https://www.aidentity.it
 * License: GPL v2 or later
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain: aidentity-generative-engine-optimizer
 * Domain Path: /languages
 *
 * @package Aidentity_GEO
 */

// Block direct access.
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

// Plugin constants.
define( 'AIDENTITY_GEO_VERSION', '1.0.3' );
define( 'AIDENTITY_GEO_PATH', plugin_dir_path( __FILE__ ) );
define( 'AIDENTITY_GEO_URL', plugin_dir_url( __FILE__ ) );
define( 'AIDENTITY_GEO_BASENAME', plugin_basename( __FILE__ ) );

/**
 * Returns the plugin settings merged with the defaults.
 *
 * The activation hook only creates the option on a fresh install and is NOT
 * executed on plugin updates, so settings saved by older versions may lack
 * newer keys (e.g. llms_txt_enabled). Merging with the defaults at runtime
 * guarantees that a missing key behaves as its default value, while keys the
 * user explicitly disabled (stored as false) are respected.
 *
 * @since 1.0.3
 * @return array Plugin settings.
 */
function aidentity_geo_get_settings() {
	$defaults = array(
		'enabled'            => true,
		'auto_faq_schema'    => true,
		'auto_summary'       => true,
		'llms_txt_enabled'   => true,
		'post_types'         => array( 'post', 'page' ),
		'exclude_categories' => array(),
		'exclude_posts'      => array(),
	);

	$settings = get_option( 'aidentity_geo_settings', array() );

	if ( ! is_array( $settings ) ) {
		$settings = array();
	}

	return wp_parse_args( $settings, $defaults );
}

/**
 * Main plugin class.
 *
 * @since 1.0.0
 */
class Aidentity_GEO {

    /**
     * Single class instance.
     *
     * @var Aidentity_GEO|null
     */
    private static $instance = null;

    /**
     * Returns the single class instance.
     *
     * @since 1.0.0
     * @return Aidentity_GEO
     */
    public static function get_instance() {
        if ( null === self::$instance ) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    /**
     * Constructor.
     *
     * @since 1.0.0
     */
    private function __construct() {
        $this->load_dependencies();
        $this->init_hooks();
    }

    /**
     * Loads plugin dependencies.
     *
     * @since 1.0.0
     */
    private function load_dependencies() {
        require_once AIDENTITY_GEO_PATH . 'includes/class-aidentity-geo-llms-txt.php';
        require_once AIDENTITY_GEO_PATH . 'includes/class-aidentity-geo-schema-faq.php';
        require_once AIDENTITY_GEO_PATH . 'includes/class-aidentity-geo-ai-summary.php';
        require_once AIDENTITY_GEO_PATH . 'includes/class-aidentity-geo-settings.php';
    }

    /**
     * Initializes plugin hooks.
     *
     * @since 1.0.0
     */
    private function init_hooks() {
        register_activation_hook( __FILE__, array( $this, 'activate' ) );
        register_deactivation_hook( __FILE__, array( $this, 'deactivate' ) );

        add_action( 'init', array( $this, 'init' ) );
        add_action( 'admin_menu', array( $this, 'admin_menu' ) );
        add_action( 'admin_enqueue_scripts', array( $this, 'admin_scripts' ) );
        add_filter( 'plugin_action_links_' . AIDENTITY_GEO_BASENAME, array( $this, 'plugin_action_links' ) );
    }

    /**
     * Plugin activation.
     *
     * @since 1.0.0
     */
    public function activate() {
        // Set default options.
        $defaults = array(
            'enabled'            => true,
            'auto_faq_schema'    => true,
            'auto_summary'       => true,
            'llms_txt_enabled'   => true,
            'post_types'         => array( 'post', 'page' ),
            'exclude_categories' => array(),
            'exclude_posts'      => array(),
        );

        if ( ! get_option( 'aidentity_geo_settings' ) ) {
            add_option( 'aidentity_geo_settings', $defaults );
        }

        // Regenerate llms.txt.
        if ( class_exists( 'Aidentity_GEO_LLMS_TXT' ) ) {
            Aidentity_GEO_LLMS_TXT::get_instance()->generate_file();
        }

        // Flush rewrite rules.
        flush_rewrite_rules();
    }

    /**
     * Plugin deactivation.
     *
     * @since 1.0.0
     */
    public function deactivate() {
        // Clear transients.
        delete_transient( 'aidentity_geo_llms_txt' );
        delete_transient( 'aidentity_geo_llms_full_txt' );

        flush_rewrite_rules();
    }

    /**
     * Plugin initialization.
     *
     * @since 1.0.0
     */
    public function init() {
        $settings = aidentity_geo_get_settings();

        if ( ! empty( $settings['enabled'] ) ) {
            Aidentity_GEO_LLMS_TXT::get_instance();
            Aidentity_GEO_Schema_FAQ::get_instance();
            Aidentity_GEO_AI_Summary::get_instance();
        }

        Aidentity_GEO_Settings::get_instance();
    }

    /**
     * Adds the admin page.
     *
     * @since 1.0.0
     */
    public function admin_menu() {
        add_options_page(
            __( 'Aidentity Generative Engine Optimizer', 'aidentity-generative-engine-optimizer' ),
            __( 'Aidentity GEO', 'aidentity-generative-engine-optimizer' ),
            'manage_options',
            'aidentity-geo',
            array( Aidentity_GEO_Settings::get_instance(), 'render_page' )
        );
    }

    /**
     * Loads admin scripts and styles.
     *
     * @since 1.0.0
     * @param string $hook Current page hook.
     */
    public function admin_scripts( $hook ) {
        if ( 'settings_page_aidentity-geo' !== $hook ) {
            return;
        }

        wp_enqueue_style(
            'aidentity-geo-admin',
            AIDENTITY_GEO_URL . 'assets/admin.css',
            array(),
            AIDENTITY_GEO_VERSION
        );
    }

    /**
     * Adds links on the plugins page.
     *
     * @since 1.0.0
     * @param array $links Existing links.
     * @return array Modified links.
     */
    public function plugin_action_links( $links ) {
        $settings_link = sprintf(
            '<a href="%s">%s</a>',
            esc_url( admin_url( 'options-general.php?page=aidentity-geo' ) ),
            esc_html__( 'Settings', 'aidentity-generative-engine-optimizer' )
        );

        array_unshift( $links, $settings_link );

        return $links;
    }
}

/**
 * Initializes the plugin.
 *
 * @since 1.0.0
 * @return Aidentity_GEO
 */
function aidentity_geo_init() {
    return Aidentity_GEO::get_instance();
}
add_action( 'plugins_loaded', 'aidentity_geo_init' );