<?php

namespace SiteSync;

use SiteSync\Admin;
use SiteSync\Settings;
use SiteSync\REST_Controller;
use SiteSync\Cron;
use SiteSync\Transport;
use SiteSync\Sync_Engine;
use SiteSync\State;

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

require_once SITE_SYNC_PLUGIN_DIR . 'includes/class-settings.php';
require_once SITE_SYNC_PLUGIN_DIR . 'includes/class-admin.php';
require_once SITE_SYNC_PLUGIN_DIR . 'includes/class-rest-controller.php';
require_once SITE_SYNC_PLUGIN_DIR . 'includes/class-auth.php';
require_once SITE_SYNC_PLUGIN_DIR . 'includes/class-cron.php';
require_once SITE_SYNC_PLUGIN_DIR . 'includes/class-log.php';
require_once SITE_SYNC_PLUGIN_DIR . 'includes/class-logger.php';
require_once SITE_SYNC_PLUGIN_DIR . 'includes/class-transport.php';
require_once SITE_SYNC_PLUGIN_DIR . 'includes/class-sync-engine.php';
require_once SITE_SYNC_PLUGIN_DIR . 'includes/class-state.php';

/**
 * Main plugin class for SiteSync.
 *
 * Handles initialization, hooks, and provides access to core components.
 */
class Plugin {
    /**
     * The singleton instance of the Plugin class.
     *
     * @var self
     */
    private static $instance;

    /**
     * Settings instance.
     *
     * @var Settings
     */
    private $settings;

    /**
     * Admin instance.
     *
     * @var Admin
     */
    private $admin;

    /**
     * REST controller instance.
     *
     * @var REST_Controller
     */
    private $rest;

    /**
     * Cron instance.
     *
     * @var Cron
     */
    private $cron;

    /**
     * Handles data transport between sites.
     *
     * @var Transport
     */
    private $transport;

    /**
     * Sync engine instance.
     *
     * @var Sync_Engine
     */
    private $engine;

    /**
     * State instance.
     *
     * @var State
     */
    private $state;

    /**
     * Constructs the Plugin instance and initializes core components.
     */
    private function __construct() {
        $this->settings  = new Settings();
        $this->state     = new State();
        $this->transport = new Transport( $this->settings );
        $this->engine    = new Sync_Engine( $this->settings, $this->transport, $this->state );
        $this->admin     = new Admin( $this->settings, $this->state, $this->engine );
        $this->rest      = new REST_Controller( $this->settings, $this->engine );
        $this->cron      = new Cron( $this->settings );
        $this->register_hooks();
    }

    /**
     * Returns the singleton instance of the Plugin class.
     *
     * @return self
     */
    public static function instance(): self {
        if ( ! self::$instance ) {
            self::$instance = new self();
        }

        return self::$instance;
    }

    /**
     * Registers hooks for admin, REST controller, cron, and sync engine.
     *
     * @return void
     */
    public function register_hooks(): void {
        $this->admin->hooks();
        $this->rest->hooks();
        $this->cron->hooks();
        $this->engine->hooks();
    }

    /**
     * Handles plugin activation tasks such as setting defaults and configuring cron.
     *
     * @return void
     */
    public static function activate(): void {
        $settings = new Settings();
        $settings->ensure_defaults();
        Cron::configure( true, $settings->get( 'sync_interval' ) );
    }

    /**
     * Handles plugin deactivation tasks such as clearing scheduled cron events.
     *
     * @return void
     */
    public static function deactivate(): void {
        Cron::clear_event();
    }
}