<?php
defined( 'ABSPATH' ) || exit;

final class EDRAD_Plugin {
	/**
	 * Radar's monitoring tables and options are scoped to the current blog.
	 * On a network activation each site initializes on its first request;
	 * this avoids unbounded synchronous loops through large networks.
	 */
	public static function boot() {
		// WordPress and Plugin Check may bootstrap Radar while installing a
		// temporary site whose core and Radar tables do not yet exist.
		// Do not provision, register recorders, or schedule tasks in that state.
		if ( function_exists( 'wp_installing' ) && wp_installing() ) {
			return;
		}
		// No destructive filesystem actions are registered for multisite.
		if ( get_option( 'edrad_version' ) !== EDRAD_VERSION ) {
			EDRAD_Database::install();
			// Mark ready only after both plugin-owned tables have been created.
			if ( EDRAD_Database::schema_exists() ) {
				update_option( 'edrad_version', EDRAD_VERSION, false );
			}
		}
		// Recheck per-site schema on administrative requests, including sites which
		// retained the version option but lost their tables during network setup.
		add_action( 'admin_init', array( __CLASS__, 'ensure_site_schema' ), 5 );
		if ( is_multisite() ) {
			add_action( 'wp_initialize_site', array( __CLASS__, 'initialize_new_site' ), 100, 1 );
		}
		EDRAD_Settings::register();
		EDRAD_Recorder::register();
		EDRAD_Impact_Monitor::register();
		EDRAD_Compatibility::register();
		EDRAD_Admin::register();
		EDRAD_Performance::register();
		EDRAD_Typography::register();
		if ( ! is_multisite() ) {
			// Rescue integrations and plugin-deactivation actions have not been
			// audited for network plugins. Keep them single-site only.
			EDRAD_Rescue_Blackbox_Bridge::register();
			EDRAD_Native_Recovery::register();
		} else {
			add_action( 'admin_notices', array( __CLASS__, 'multisite_notice' ) );
		}
		add_action( 'edrad_daily_maintenance', array( __CLASS__, 'daily_maintenance' ) );
		if ( ! wp_next_scheduled( 'edrad_daily_maintenance' ) ) {
			wp_schedule_event( time() + HOUR_IN_SECONDS, 'daily', 'edrad_daily_maintenance' );
		}
	}

	/** Activation is allowed for individual sites and the whole network.
	 * Network-wide activation provisions the current blog, then the other
	 * blogs initialize lazily during their first WordPress bootstrap.
	 */
	public static function activate( $network_wide = false ) {
		EDRAD_Database::install();
		$fingerprint = EDRAD_Fingerprint::capture();
		update_option( 'edrad_last_fingerprint', $fingerprint, false );
		if ( ! EDRAD_Database::schema_exists() ) {
			return;
		}
		update_option( 'edrad_version', EDRAD_VERSION, false );
		EDRAD_Database::insert_event(
			array(
				'event_type' => 'baseline_created',
				'severity'   => 1,
				'summary'    => 'Initial system baseline created.',
				'context'    => array( 'fingerprint' => $fingerprint ),
			)
		);
		if ( ! wp_next_scheduled( 'edrad_daily_maintenance' ) ) {
			wp_schedule_event( time() + HOUR_IN_SECONDS, 'daily', 'edrad_daily_maintenance' );
		}
	}

	/**
	 * Repair missing per-site tables. The light-weight checks are limited to
	 * administrators, at most once per day after a successful verification.
	 */
	public static function ensure_site_schema() {
		if ( ! current_user_can( 'manage_options' ) ) {
			return;
		}
		$last_check = (int) get_option( 'edrad_schema_checked_at', 0 );
		if ( $last_check > time() - DAY_IN_SECONDS ) {
			return;
		}
		if ( ! EDRAD_Database::schema_exists() ) {
			EDRAD_Database::install();
		}
		if ( EDRAD_Database::schema_exists() ) {
			update_option( 'edrad_version', EDRAD_VERSION, false );
			update_option( 'edrad_schema_checked_at', time(), false );
		}
	}

	/** Provision a newly created site without touching network-level plugins. */
	public static function initialize_new_site( $site ) {
		if ( ! is_multisite() || ! $site instanceof WP_Site ) {
			return;
		}
		switch_to_blog( (int) $site->blog_id );
		try {
			EDRAD_Database::install();
			if ( EDRAD_Database::schema_exists() ) {
				update_option( 'edrad_version', EDRAD_VERSION, false );
				update_option( 'edrad_schema_checked_at', time(), false );
			}
		} finally {
			restore_current_blog();
		}
	}

	/** No filesystem-based recovery is exposed on Multisite. */
	public static function multisite_notice() {
		if ( ! current_user_can( 'manage_options' ) || ! function_exists( 'get_current_screen' ) ) {
			return;
		}
		$screen = get_current_screen();
		if ( ! $screen || false === strpos( (string) $screen->id, 'error-division-radar' ) ) {
			return;
		}
		echo '<div class="notice notice-info"><p>' . esc_html__( 'Multisite mode: Radar monitors this site independently. Rescue and plugin-isolation actions are disabled on Multisite.', 'error-division-radar' ) . '</p></div>';
	}

	public static function deactivate() {
		wp_clear_scheduled_hook( 'edrad_daily_maintenance' );
	}

	public static function daily_maintenance() {
		EDRAD_Recorder::record_drift_check();
		EDRAD_Database::purge_old_events( EDRAD_Settings::get( 'retention_days' ) );
	}

}