<?php
/**
 * Plugin Name:       AI-Ready WP
 * Plugin URI:        https://studiomeyer.io/store/ai-ready-wp
 * Description:       Make your WordPress site discoverable by AI agents. Generates agents.json, agent-card.json, llms.txt, JSON-LD schemas, and more.
 * Version:           4.1.1
 * Requires at least: 6.0
 * Tested up to:      6.9.4
 * Requires PHP:      8.0
 * Author:            StudioMeyer
 * Author URI:        https://studiomeyer.io
 * License:           GPL v2 or later
 * License URI:       https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain:       ai-ready-wp
 * Domain Path:       /languages
 */

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

// Plugin constants
define( 'AIREWP_VERSION', '4.1.1' );
define( 'AIREWP_ROOT_PATH', function_exists( 'get_home_path' ) ? get_home_path() : ABSPATH );
define( 'AIREWP_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
define( 'AIREWP_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
define( 'AIREWP_PLUGIN_BASENAME', plugin_basename( __FILE__ ) );
define( 'AIREWP_OPTION_KEY', 'airewp_settings' );

// Include core files
require_once AIREWP_PLUGIN_DIR . 'includes/class-settings.php';
require_once AIREWP_PLUGIN_DIR . 'includes/class-rewrite.php';
require_once AIREWP_PLUGIN_DIR . 'includes/class-dashboard.php';
require_once AIREWP_PLUGIN_DIR . 'includes/class-indexnow.php';
require_once AIREWP_PLUGIN_DIR . 'includes/generators/class-agents-json.php';
require_once AIREWP_PLUGIN_DIR . 'includes/generators/class-agent-card.php';
require_once AIREWP_PLUGIN_DIR . 'includes/generators/class-llms-txt.php';
require_once AIREWP_PLUGIN_DIR . 'includes/generators/class-json-ld.php';
require_once AIREWP_PLUGIN_DIR . 'includes/class-rest-api.php';
require_once AIREWP_PLUGIN_DIR . 'includes/class-robots-txt.php';
require_once AIREWP_PLUGIN_DIR . 'includes/class-crawler-analytics.php';
require_once AIREWP_PLUGIN_DIR . 'includes/class-abilities.php';

// v4.0 Modules
require_once AIREWP_PLUGIN_DIR . 'includes/modules/class-seo.php';

/**
 * Main plugin class.
 */
final class AI_Ready_WP {

    private static ?self $instance = null;

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

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

    private function init_hooks(): void {
        // Components
        new AIREWP_Settings();
        new AIREWP_Rewrite();
        new AIREWP_Dashboard();

        // IndexNow
        new AIREWP_IndexNow();

        // Generators
        new AIREWP_Agents_JSON();
        new AIREWP_Agent_Card();
        new AIREWP_LLMS_Txt();
        new AIREWP_JSON_LD();

        // REST API
        new AIREWP_REST_API();

        // AI Bot Management in robots.txt (v3.0)
        new AIREWP_Robots_Txt();

        // AI Crawler Analytics (v3.0)
        new AIREWP_Crawler_Analytics();

        // WP Abilities API integration — WP 6.9+ (v3.0)
        new AIREWP_Abilities();

        // v4.0 Modules
        new AIREWP_SEO();

        // Regenerate files when settings or content change
        add_action( 'airewp_settings_updated', [ $this, 'regenerate_all' ] );
        add_action( 'save_post', [ $this, 'on_content_change' ], 20, 2 );
        add_action( 'delete_post', [ $this, 'schedule_regeneration' ] );
        add_action( 'airewp_cron_regenerate', [ $this, 'regenerate_all' ] );

        // Schedule daily regeneration
        if ( ! wp_next_scheduled( 'airewp_cron_regenerate' ) ) {
            wp_schedule_event( time(), 'daily', 'airewp_cron_regenerate' );
        }
    }

    /**
     * Get plugin settings with defaults.
     */
    public static function get_settings(): array {
        $defaults = [
            // Business info
            'company_name'     => get_bloginfo( 'name' ),
            'company_desc'     => get_bloginfo( 'description' ),
            'company_url'      => home_url(),
            'company_email'    => get_option( 'admin_email' ),
            'company_phone'    => '',
            'company_address'  => '',
            'company_city'     => '',
            'company_zip'      => '',
            'company_country'  => '',
            'company_logo'     => '',
            'industry'         => 'general',
            'languages'        => [ get_locale() ],

            // Services (comma-separated)
            'services'         => '',

            // Social
            'social_x'         => '',
            'social_linkedin'  => '',
            'social_instagram' => '',
            'social_facebook'  => '',
            'social_github'    => '',

            // Features toggles
            'enable_agents_json'        => true,
            'enable_agent_card'         => true,
            'enable_llms_txt'           => true,
            'enable_json_ld'            => true,
            'enable_indexnow'           => true,
            'enable_rest_api'           => true,
            'enable_robots_ai'          => true,   // v3.0
            'enable_crawler_analytics'  => true,   // v3.0

            // Robots.txt AI policy (v3.0)
            'robots_block_training'     => true,   // Block training bots by default
            'robots_block_retrieval'    => false,  // Allow retrieval/search bots

            // IndexNow
            'indexnow_key'     => '',

            // JSON-LD
            'schema_type'      => 'Organization', // Organization or LocalBusiness

            // v4.0 — SEO Module
            'enable_seo'            => true,

            // Advanced
            'custom_tools'     => '',
            'custom_skills'    => '',
        ];

        $saved = get_option( AIREWP_OPTION_KEY, [] );
        return wp_parse_args( $saved, $defaults );
    }

    /**
     * Regenerate all static files.
     */
    public function regenerate_all(): void {
        $settings = self::get_settings();

        // agents.json
        if ( $settings['enable_agents_json'] ) {
            AIREWP_Agents_JSON::generate( $settings );
        }

        // agent-card.json
        if ( $settings['enable_agent_card'] ) {
            AIREWP_Agent_Card::generate( $settings );
        } else {
            foreach ( [ 'agent-card.json', 'agent.json' ] as $card_name ) {
                $card_file = self::get_well_known_dir() . $card_name;
                self::delete_file( $card_file );
            }
        }

        // llms.txt
        if ( $settings['enable_llms_txt'] ) {
            AIREWP_LLMS_Txt::generate( $settings );
        }

        // IndexNow
        if ( $settings['enable_indexnow'] && ! empty( $settings['indexnow_key'] ) ) {
            AIREWP_IndexNow::generate_key_file( $settings['indexnow_key'] );
        }

        do_action( 'airewp_files_regenerated', $settings );
    }

    /**
     * Handle content changes — regenerate files and ping IndexNow.
     */
    public function on_content_change( int $post_id, \WP_Post $post ): void {
        // Skip revisions, autosaves, non-public post types
        if ( wp_is_post_revision( $post_id ) || wp_is_post_autosave( $post_id ) ) {
            return;
        }
        if ( 'publish' !== $post->post_status ) {
            return;
        }

        $this->schedule_regeneration();

        // Ping IndexNow for this specific URL
        $settings = self::get_settings();
        if ( $settings['enable_indexnow'] && ! empty( $settings['indexnow_key'] ) ) {
            AIREWP_IndexNow::ping_url( get_permalink( $post_id ), $settings );
        }
    }

    /**
     * Schedule a debounced regeneration (avoid running on every single save).
     */
    public function schedule_regeneration(): void {
        if ( ! wp_next_scheduled( 'airewp_cron_regenerate' ) ) {
            wp_schedule_single_event( time() + 30, 'airewp_cron_regenerate' );
        }
    }

    /**
     * Get the output directory for generated files.
     */
    public static function get_output_dir(): string {
        return AIREWP_ROOT_PATH;
    }

    /**
     * Get the .well-known directory, creating it if needed.
     */
    public static function get_well_known_dir(): string {
        $dir = AIREWP_ROOT_PATH . '.well-known/';
        global $wp_filesystem;
        if ( empty( $wp_filesystem ) ) {
            require_once ABSPATH . 'wp-admin/includes/file.php';
            WP_Filesystem();
        }
        if ( ! $wp_filesystem->is_dir( $dir ) ) {
            wp_mkdir_p( $dir );
        }
        return $dir;
    }

    /**
     * Write a file using WP_Filesystem.
     */
    public static function write_file( string $path, string $content ): bool {
        global $wp_filesystem;
        if ( empty( $wp_filesystem ) ) {
            require_once ABSPATH . 'wp-admin/includes/file.php';
            WP_Filesystem();
        }
        return $wp_filesystem->put_contents( $path, $content, FS_CHMOD_FILE );
    }

    /**
     * Delete a file using WP_Filesystem.
     */
    public static function delete_file( string $path ): bool {
        global $wp_filesystem;
        if ( empty( $wp_filesystem ) ) {
            require_once ABSPATH . 'wp-admin/includes/file.php';
            WP_Filesystem();
        }
        if ( $wp_filesystem->exists( $path ) ) {
            return $wp_filesystem->delete( $path );
        }
        return true;
    }
}

// Activation
register_activation_hook( __FILE__, function (): void {
    // Generate IndexNow key on activation
    $settings = AI_Ready_WP::get_settings();
    if ( empty( $settings['indexnow_key'] ) ) {
        $settings['indexnow_key'] = bin2hex( random_bytes( 32 ) );
        update_option( AIREWP_OPTION_KEY, $settings );
    }

    // Flush rewrite rules
    AIREWP_Rewrite::add_rules();
    flush_rewrite_rules();

    // Generate all files
    AI_Ready_WP::instance()->regenerate_all();
} );

// Deactivation
register_deactivation_hook( __FILE__, function (): void {
    wp_clear_scheduled_hook( 'airewp_cron_regenerate' );
    flush_rewrite_rules();
} );

// Boot
AI_Ready_WP::instance();