<?php
/**
 * Plugin Name:       Evoka - AI Search Visibility and Schema
 * Plugin URI:        https://wordpress.org/plugins/evoka/
 * Description:       See if AI engines (ChatGPT, Perplexity, Google AI Overviews) can find and cite your site: get an AI-readiness score, a prioritized fix list, and AI-specific structured data.
 * Version:           0.5.0
 * Requires at least: 6.0
 * Requires PHP:      7.4
 * Author:            Evoka
 * License:           GPL-2.0-or-later
 * License URI:       https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain:       evoka
 *
 * @package Evoka
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // No direct access.
}

define( 'EVOKA_VERSION', '0.5.0' );
define( 'EVOKA_FILE', __FILE__ );
define( 'EVOKA_DIR', plugin_dir_path( __FILE__ ) );
define( 'EVOKA_URL', plugin_dir_url( __FILE__ ) );
define( 'EVOKA_BASENAME', plugin_basename( __FILE__ ) );

require_once EVOKA_DIR . 'includes/functions.php';

/**
 * Minimal class loader. Maps Evoka_Foo_Bar => includes/class-foo-bar.php
 * and Evoka_Admin_Foo => admin/class-foo.php.
 */
spl_autoload_register(
	function ( $class_name ) {
		if ( strpos( $class_name, 'Evoka' ) !== 0 ) {
			return;
		}

		$relative = strtolower( substr( $class_name, strlen( 'Evoka_' ) ) );
		$relative = str_replace( '_', '-', $relative );

		// Admin classes (Evoka_Admin_*) live under admin/; everything else under includes/.
		if ( strpos( $relative, 'admin-' ) === 0 ) {
			$path = EVOKA_DIR . 'admin/class-' . $relative . '.php';
		} else {
			$path = EVOKA_DIR . 'includes/class-' . $relative . '.php';
		}

		if ( is_readable( $path ) ) {
			require_once $path;
		}
	}
);

/**
 * Main plugin container. Wires everything together on plugins_loaded.
 */
final class Evoka_Plugin {

	/**
	 * Singleton instance.
	 *
	 * @var Evoka_Plugin|null
	 */
	private static $instance = null;

	/**
	 * Boot the plugin (singleton).
	 *
	 * @return Evoka_Plugin
	 */
	public static function instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
			self::$instance->init();
		}
		return self::$instance;
	}

	/**
	 * Hook everything up.
	 */
	private function init() {
		// Front-end: emit structured data + manage AI-crawler signals.
		$schema = new Evoka_Schema_Generator();
		add_action( 'wp_head', array( $schema, 'output' ), 20 );

		$crawler = new Evoka_Crawler_Controls();
		add_filter( 'robots_txt', array( $crawler, 'filter_robots_txt' ), 20, 2 );

		$llms = new Evoka_Llms_Txt();
		$llms->register();

		// Passive AI crawler/referral logging.
		$visibility = new Evoka_Visibility_Log();
		$visibility->register();

		// Scheduled weekly re-audit + tracked-citation checks.
		$cron = new Evoka_Cron();
		$cron->register();

		// Admin UI (also owns the client-ready report screen).
		if ( is_admin() ) {
			$admin = new Evoka_Admin_Ui();
			$admin->register();
		}

		// Translations: WordPress.org-hosted plugins get them loaded
		// automatically for the "evoka" text domain (WP 4.6+).
	}

	/**
	 * Activation: set defaults and flush rewrites so llms.txt resolves.
	 *
	 * On multisite network activation this runs for the current site only;
	 * other sites fall back to default settings (evoka_get_setting()) and
	 * add the llms.txt rule on their first request (Evoka_Llms_Txt::maybe_flush_rules()).
	 */
	public static function activate() {
		$defaults = array(
			'schema_enabled'   => 1,
			'llms_txt_enabled' => 1,
			'crawler_policy'   => 'allow', // One of: allow, track, block.
			'byok_provider'    => '',      // One of: '' (none), openai, perplexity.
			// NOTE: the API key is stored in a separate option and is the user's own key.
		);
		if ( false === get_option( 'evoka_settings' ) ) {
			add_option( 'evoka_settings', $defaults );
		}

		// Make sure the llms.txt rewrite endpoint exists before flushing.
		( new Evoka_Llms_Txt() )->add_rewrite();
		flush_rewrite_rules();

		// The visibility-log table only matters once the site is Pro, but
		// creating it now avoids a lazy-create on the first logged pageview.
		( new Evoka_Visibility_Log() )->install();
	}

	/**
	 * Deactivation: clear the scheduled audit and remove the llms.txt rule -
	 * on every site when network-deactivated on multisite.
	 *
	 * @param bool $network_wide Whether the plugin is being network-deactivated.
	 */
	public static function deactivate( $network_wide = false ) {
		if ( is_multisite() && $network_wide ) {
			foreach ( get_sites(
				array(
					'fields' => 'ids',
					'number' => 0,
				)
			) as $blog_id ) {
				switch_to_blog( $blog_id );
				self::deactivate_site();
				restore_current_blog();
			}
			return;
		}
		self::deactivate_site();
	}

	/**
	 * Per-site deactivation cleanup.
	 */
	private static function deactivate_site() {
		wp_clear_scheduled_hook( 'evoka_scheduled_audit' );
		Evoka_Llms_Txt::remove_stored_rule();
	}
}

register_activation_hook( __FILE__, array( 'Evoka_Plugin', 'activate' ) );
register_deactivation_hook( __FILE__, array( 'Evoka_Plugin', 'deactivate' ) );

add_action( 'plugins_loaded', array( 'Evoka_Plugin', 'instance' ) );