<?php
/**
 * Service container and bootstrap.
 *
 * @package LinkTender
 */

defined( 'ABSPATH' ) || exit;

/**
 * Main plugin object. Add-ons reach the services through linktender().
 */
final class LinkTender_Plugin {

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

	/**
	 * Links repository.
	 *
	 * @var LinkTender_Links
	 */
	public $links;

	/**
	 * Content scanner.
	 *
	 * @var LinkTender_Scanner
	 */
	public $scanner;

	/**
	 * HTTP checker.
	 *
	 * @var LinkTender_Checker
	 */
	public $checker;

	/**
	 * Background queue.
	 *
	 * @var LinkTender_Queue
	 */
	public $queue;

	/**
	 * Link editor.
	 *
	 * @var LinkTender_Editor
	 */
	public $editor;

	/**
	 * Admin UI (admin requests only).
	 *
	 * @var LinkTender_Admin|null
	 */
	public $admin = null;

	/**
	 * Returns the instance.
	 *
	 * @return LinkTender_Plugin
	 */
	public static function instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
			self::$instance->boot();
		}
		return self::$instance;
	}

	/**
	 * Wires services and hooks.
	 *
	 * @return void
	 */
	private function boot() {
		$this->links   = new LinkTender_Links();
		$this->scanner = new LinkTender_Scanner( $this->links );
		$this->checker = new LinkTender_Checker();
		$this->queue   = new LinkTender_Queue( $this->links, $this->scanner, $this->checker );
		$this->editor  = new LinkTender_Editor( $this->links, $this->scanner );

		$this->scanner->hooks();
		$this->queue->hooks();
		( new LinkTender_Frontend() )->hooks();

		// Creates or upgrades the tables when an admin screen is opened (also covers sites of a very
		// large network that a network activation has not reached yet). Background batches upgrade
		// too. Front-end page views never change the database schema.
		add_action( 'admin_init', array( 'LinkTender_Install', 'maybe_upgrade' ), 0 );
		add_action( 'wp_initialize_site', array( $this, 'new_site' ), 200 );
		add_action( LinkTender_Install::NETWORK_HOOK, array( 'LinkTender_Install', 'continue_network_install' ) );
		add_filter( 'wpmu_drop_tables', array( 'LinkTender_Install', 'drop_site_tables' ) );

		if ( is_admin() && class_exists( 'LinkTender_Admin' ) ) {
			$this->admin = new LinkTender_Admin( $this );
			$this->admin->hooks();
		}

		/**
		 * Fires when LinkTender is ready. Add-ons should hook here.
		 *
		 * @param LinkTender_Plugin $plugin Plugin instance.
		 */
		do_action( 'linktender_loaded', $this );
	}

	/**
	 * Sets up a new multisite site when the plugin is network-active.
	 *
	 * @param WP_Site $site New site.
	 * @return void
	 */
	public function new_site( $site ) {
		if ( ! function_exists( 'is_plugin_active_for_network' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}
		if ( ! is_plugin_active_for_network( plugin_basename( LINKTENDER_FILE ) ) ) {
			return;
		}
		switch_to_blog( $site->blog_id );
		LinkTender_Install::install_site();
		restore_current_blog();
	}

	/**
	 * Capability needed to use the plugin screens.
	 *
	 * @return string
	 */
	public static function capability() {
		/**
		 * Filters the capability required to view and fix links.
		 *
		 * @param string $cap Capability.
		 */
		return apply_filters( 'linktender_capability', 'edit_others_posts' );
	}
}