<?php
/**
 * Wiring — hooks everything together on plugins_loaded.
 */

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

class SXANL_Plugin {

	/** @var SXANL_Plugin|null */
	private static $instance = null;

	public static function instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	private function __construct() {
		add_action( 'init', array( 'SXANL_Migrate', 'run' ), 1 ); // carry over data from the old sxa_ names
		add_action( 'init', array( 'SXANL_Schema', 'maybe_upgrade' ) );
		add_action( SXANL_GeoIP::STAGE_HOOK, array( 'SXANL_GeoIP', 'ensure_data' ) );
		add_action( 'init', array( 'SXANL_GeoIP', 'schedule_staging' ) );
		SXANL_Edition::hook();
		add_action( 'init', array( $this, 'grant_caps_once' ) );

		// Collection.
		add_action( 'rest_api_init', array( 'SXANL_Tracker_Endpoint', 'register_routes' ) );
		add_action( 'rest_api_init', array( 'SXANL_REST_Read', 'register_routes' ) );

		// Full-page caches (LiteSpeed etc.) must never serve a stale API
		// response — the analytics endpoints are per-request dynamic.
		add_filter( 'rest_pre_dispatch', array( $this, 'rest_no_cache' ), 10, 3 );
		add_action( 'init', array( $this, 'purge_page_cache_on_upgrade' ) );

		// Front-end beacon.
		add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_beacon' ) );
		add_action( 'wp_head', array( $this, 'noscript_pixel' ), 99 );
		add_action( 'wp_footer', array( $this, 'maybe_credit' ), 99 );

		// On-site search.
		SXANL_Site_Search::hook();

		// Cron. (The `cron_schedules` filter is registered in the main plugin
		// file so it is also live during activation.)
		add_action( SXANL_Rollup::CRON_HOOK, array( 'SXANL_Rollup', 'run' ) );
		add_action( SXANL_Rollup::SALT_HOOK, array( 'SXANL_Rollup', 'rotate_salt_cron' ) );
		add_action( 'sxanl_geoip_update', array( 'SXANL_GeoIP_Updater', 'run' ) );

		// Admin.
		if ( is_admin() ) {
			SXANL_Admin::hook();
			SXANL_Dashboard_Widgets::hook();
		}

		// Make sure schedules exist even if activation was missed (e.g. mu use).
		add_action( 'init', array( 'SXANL_Rollup', 'schedule' ) );
		add_action( 'init', array( 'SXANL_GeoIP_Updater', 'schedule' ) );
	}

	/**
	 * Tell LiteSpeed (and compatible full-page caches) not to store our REST
	 * responses. Without this, an anonymous GET to e.g. /dashboard?range=28d
	 * gets cached and that one range then freezes while the others update.
	 * `/geojson` is the deliberate exception — a static asset with its own
	 * long Cache-Control.
	 *
	 * @param mixed           $result  Dispatch short-circuit (unchanged).
	 * @param WP_REST_Server  $server  Server instance.
	 * @param WP_REST_Request $request Current request.
	 * @return mixed
	 */
	public function rest_no_cache( $result, $server, $request ) {
		$route = ltrim( (string) $request->get_route(), '/' );
		if ( 0 === strpos( $route, SXANL_REST_NS ) && SXANL_REST_NS . '/geojson' !== $route ) {
			do_action( 'litespeed_control_set_nocache', 'sentrixa-analytics dynamic API' );
			if ( ! headers_sent() ) {
				nocache_headers();
				header( 'X-LiteSpeed-Cache-Control: no-cache' );
			}
		}
		return $result;
	}

	/**
	 * On a version bump, purge the page cache once so no stale API response
	 * (or dashboard HTML) survives the upgrade.
	 */
	public function purge_page_cache_on_upgrade() {
		if ( get_option( 'sxanl_plugin_version' ) === SXANL_VERSION ) {
			return;
		}
		do_action( 'litespeed_purge_all' );
		if ( function_exists( 'wp_cache_flush' ) ) {
			wp_cache_flush();
		}
		update_option( 'sxanl_plugin_version', SXANL_VERSION, false );
	}

	/**
	 * Grant the read capability to administrators + editors, once.
	 */
	public function grant_caps_once() {
		if ( get_option( 'sxanl_caps_granted' ) ) {
			return;
		}
		foreach ( array( 'administrator', 'editor' ) as $role_name ) {
			$role = get_role( $role_name );
			if ( $role ) {
				$role->add_cap( 'view_sentrixa_analytics' );
			}
		}
		update_option( 'sxanl_caps_granted', 1, false );
	}

	/**
	 * Enqueue the beacon on the front end (never in admin, feeds, or REST).
	 */
	public function enqueue_beacon() {
		if ( is_admin() || is_feed() || is_preview() ) {
			return;
		}
		if ( ! SXANL_Settings::get( 'tracking_enabled' ) ) {
			return;
		}
		if ( is_user_logged_in() && ! SXANL_Settings::get( 'track_admins' ) && current_user_can( 'edit_posts' ) ) {
			return;
		}

		wp_enqueue_script(
			'sentrixa-analytics-beacon',
			SXANL_URL . 'assets/js/beacon.js',
			array(),
			SXANL_VERSION,
			true
		);
		wp_localize_script(
			'sentrixa-analytics-beacon',
			'SXANL_BEACON',
			array(
				'hit'    => esc_url_raw( rest_url( SXANL_REST_NS . '/hit' ) ),
				'engage' => 1,
			)
		);
	}

	/**
	 * No-JS fallback: a 1x1 image whose src is the pixel endpoint.
	 * Wrapped in <noscript> so it only fires when the beacon can't.
	 */
	public function noscript_pixel() {
		if ( is_admin() || is_feed() ) {
			return;
		}
		if ( ! SXANL_Settings::get( 'tracking_enabled' ) ) {
			return;
		}
		if ( is_user_logged_in() && ! SXANL_Settings::get( 'track_admins' ) && current_user_can( 'edit_posts' ) ) {
			return;
		}
		$src = add_query_arg(
			array(
				'p' => rawurlencode( sxanl_normalise_path( isset( $_SERVER['REQUEST_URI'] ) ? wp_unslash( $_SERVER['REQUEST_URI'] ) : '/' ) ),
				't' => rawurlencode( sxanl_str_limit( wp_get_document_title(), 120 ) ),
			),
			rest_url( SXANL_REST_NS . '/px' )
		);
		printf(
			'<noscript><img src="%s" alt="" width="1" height="1" style="position:absolute;left:-9999px" referrerpolicy="no-referrer-when-downgrade" /></noscript>' . "\n",
			esc_url( $src )
		);
	}

	/**
	 * Optional "Analytics by Sentrixa" front-end credit (off by default).
	 */
	public function maybe_credit() {
		if ( ! SXANL_Settings::get( 'show_credit' ) ) {
			return;
		}
		printf(
			'<p class="sxa-credit" style="text-align:center;font-size:12px;opacity:.6;margin:1rem 0">%s</p>',
			wp_kses_post(
				sprintf(
					/* translators: %s: Sentrixa link */
					__( 'Privacy-first analytics by %s', 'sentrixa-analytics' ),
					'<a href="https://sentrixa.co.uk/" rel="nofollow">Sentrixa</a>'
				)
			)
		);
	}
}