<?php
/**
 * Main plugin container.
 *
 * @package AceloraSiteAccelerator
 */

namespace Acelora\SiteAccelerator\Includes;

use Acelora\SiteAccelerator\Admin\Admin;
use Acelora\SiteAccelerator\Modules\Analytics;
use Acelora\SiteAccelerator\Modules\Browser_Cache;
use Acelora\SiteAccelerator\Modules\CDN;
use Acelora\SiteAccelerator\Modules\Compression_Engine;
use Acelora\SiteAccelerator\Modules\CSS_Optimizer;
use Acelora\SiteAccelerator\Modules\Database_Optimizer;
use Acelora\SiteAccelerator\Modules\Heartbeat_Manager;
use Acelora\SiteAccelerator\Modules\Image_Optimizer;
use Acelora\SiteAccelerator\Modules\JS_Optimizer;
use Acelora\SiteAccelerator\Modules\Lazy_Loading;
use Acelora\SiteAccelerator\Modules\Page_Cache;
use Acelora\SiteAccelerator\Modules\Preloader;

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

/**
 * Coordinates services and modules.
 */
final class Plugin {

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

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

	/**
	 * Logger service.
	 *
	 * @var Logger
	 */
	private $logger;

	/**
	 * Filesystem service.
	 *
	 * @var Filesystem
	 */
	private $filesystem;

	/**
	 * Registered modules.
	 *
	 * @var array<string,object>
	 */
	private $modules = array();

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

		return self::$instance;
	}

	/**
	 * Constructor.
	 */
	private function __construct() {
		$this->settings   = new Settings();
		$this->logger     = new Logger( $this->settings );
		$this->filesystem = new Filesystem( $this->logger );
	}

	/**
	 * Boot plugin.
	 *
	 * @return void
	 */
	public function run() {
		$this->filesystem->prepare();
		$this->register_modules();

		foreach ( $this->modules as $module ) {
			if ( method_exists( $module, 'register' ) ) {
				$module->register();
			}
		}

		( new Cron( $this ) )->register();
		( new Ajax( $this ) )->register();

		( new Admin( $this ) )->register();
	}

	/**
	 * Register module instances.
	 *
	 * @return void
	 */
	private function register_modules() {
		$this->modules = array(
			'page_cache'  => new Page_Cache( $this->settings, $this->logger, $this->filesystem ),
			'preloader'   => new Preloader( $this->settings, $this->logger ),
			'browser'     => new Browser_Cache( $this->settings, $this->logger ),
			'css'         => new CSS_Optimizer( $this->settings ),
			'js'          => new JS_Optimizer( $this->settings ),
			'images'      => new Image_Optimizer( $this->settings, $this->logger ),
			'database'    => new Database_Optimizer( $this->settings, $this->logger ),
			'heartbeat'   => new Heartbeat_Manager( $this->settings ),
			'compression' => new Compression_Engine( $this->settings ),
			'lazy'        => new Lazy_Loading( $this->settings ),
			'cdn'         => new CDN( $this->settings ),
			'analytics'   => new Analytics( $this->settings, $this->logger, $this->filesystem ),
		);
	}

	/**
	 * Get a module.
	 *
	 * @param string $key Module key.
	 * @return object|null
	 */
	public function module( $key ) {
		return isset( $this->modules[ $key ] ) ? $this->modules[ $key ] : null;
	}

	/**
	 * Purge all caches managed by this plugin.
	 *
	 * @return int Deleted file count.
	 */
	public function purge_all_caches() {
		$deleted = 0;
		$cache   = $this->module( 'page_cache' );

		if ( $cache && method_exists( $cache, 'purge_all' ) ) {
			$deleted += absint( $cache->purge_all() );
		}

		$deleted += absint( $this->filesystem->clear_directory( $this->filesystem->asset_cache_dir() ) );

		/**
		 * Fires after Acelora clears plugin-managed caches.
		 *
		 * @param int $deleted Deleted file count.
		 */
		do_action( 'acelora_site_accelerator_cache_purged', $deleted );

		return $deleted;
	}

	/**
	 * Get settings service.
	 *
	 * @return Settings
	 */
	public function settings() {
		return $this->settings;
	}

	/**
	 * Get logger service.
	 *
	 * @return Logger
	 */
	public function logger() {
		return $this->logger;
	}

	/**
	 * Get filesystem service.
	 *
	 * @return Filesystem
	 */
	public function filesystem() {
		return $this->filesystem;
	}
}