<?php
/**
 * Plugin singleton - wires all components together.
 *
 * @package AEL42A
 */

namespace AEL42A;

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

/**
 * Main plugin class. Instantiates every component exactly once and owns
 * activation / deactivation lifecycle (rewrite flush, cron scheduling).
 */
class Plugin {

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

	/**
	 * Markdown controller.
	 *
	 * @var Markdown_Controller
	 */
	public $markdown_controller;

	/**
	 * llms.txt / llms-full.txt component.
	 *
	 * @var Llms_Txt
	 */
	public $llms_txt;

	/**
	 * MCP server (REST route + JSON-RPC dispatch).
	 *
	 * @var Mcp_Server
	 */
	public $mcp_server;

	/**
	 * MCP discovery document.
	 *
	 * @var Mcp_Discovery
	 */
	public $mcp_discovery;

	/**
	 * Connect / pairing flow.
	 *
	 * @var Connect
	 */
	public $connect;

	/**
	 * Telemetry counters + opt-in reporter.
	 *
	 * @var Telemetry
	 */
	public $telemetry;

	/**
	 * Existing-content detector (respect llms.txt etc. the site already has).
	 *
	 * @var Existing_Content
	 */
	public $existing_content;

	/**
	 * Admin page (wp-admin only).
	 *
	 * @var \AEL42A\Admin\Admin_Page|null
	 */
	public $admin_page = null;

	/**
	 * Get (and lazily create) the singleton.
	 *
	 * @return Plugin
	 */
	public static function instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Wire components and shared hooks.
	 */
	private function __construct() {
		Cache::register_hooks();

		$this->telemetry           = new Telemetry();
		$this->existing_content    = new Existing_Content();
		$this->markdown_controller = new Markdown_Controller( $this->telemetry );
		$this->llms_txt            = new Llms_Txt( $this->telemetry );
		$this->mcp_server          = new Mcp_Server( new Mcp_Tools(), $this->telemetry );
		$this->mcp_discovery       = new Mcp_Discovery();
		$this->connect             = new Connect( new Api_Client() );

		$this->telemetry->register_hooks();
		$this->existing_content->register_hooks();
		$this->markdown_controller->register_hooks();
		$this->llms_txt->register_hooks();
		$this->mcp_server->register_hooks();
		$this->mcp_discovery->register_hooks();
		$this->connect->register_hooks();

		if ( is_admin() && class_exists( '\\AEL42A\\Admin\\Admin_Page' ) ) {
			$this->admin_page = new Admin\Admin_Page( $this->connect );
			$this->admin_page->register_hooks();
		}

		// Load bundled translations (es_ES, fr_FR, pt_BR ship in /languages).
		// Must run on init: loading text domains earlier trips a _doing_it_wrong
		// notice in WordPress 6.7+.
		add_action( 'init', array( $this, 'load_textdomain' ) );

		// Make sure the daily cron survives environments that wipe cron arrays.
		add_action( 'init', array( $this, 'ensure_cron' ) );
	}

	/**
	 * Load the plugin text domain so bundled .mo files resolve for the
	 * current site locale. Translations live in the plugin's /languages
	 * directory (see the Domain Path header); a user-supplied override in
	 * wp-content/languages/plugins takes precedence automatically.
	 */
	public function load_textdomain() {
		load_plugin_textdomain(
			'ael-42a',
			false,
			dirname( plugin_basename( AEL42A_FILE ) ) . '/languages'
		);
	}

	/**
	 * Schedule the shared daily event if missing.
	 */
	public function ensure_cron() {
		if ( ! wp_next_scheduled( 'ael42a_daily' ) ) {
			wp_schedule_event( time() + HOUR_IN_SECONDS, 'daily', 'ael42a_daily' );
		}
	}

	/**
	 * Activation: register rewrites and flush, schedule cron.
	 */
	public static function activate() {
		// Components are not constructed yet during activation - register the
		// rewrite rules directly so the flush below picks them up.
		Markdown_Controller::add_rewrite_rules();
		Llms_Txt::add_rewrite_rules();
		Mcp_Discovery::add_rewrite_rules();
		flush_rewrite_rules();

		if ( ! wp_next_scheduled( 'ael42a_daily' ) ) {
			wp_schedule_event( time() + HOUR_IN_SECONDS, 'daily', 'ael42a_daily' );
		}

		// Detect artifacts the site already provides (needs a loopback, so
		// it runs as a one-off event shortly after activation rather than
		// inline).
		wp_schedule_single_event( time() + 30, 'ael42a_detect_existing' );
	}

	/**
	 * Deactivation: flush rewrites, clear cron.
	 */
	public static function deactivate() {
		flush_rewrite_rules();
		wp_clear_scheduled_hook( 'ael42a_daily' );
		wp_clear_scheduled_hook( 'ael42a_detect_existing' );
	}
}