<?php

defined( 'ABSPATH' ) || exit;

if ( class_exists( 'AIEO_Dark_Screens' ) ) {
	return;
}

class AIEO_Dark_Screens {

	
	const OPTION = 'aieo_dark_screens';
	const MAX    = 60;

	
	public static function rows() {
		$v = get_option( self::OPTION, array() );
		return is_array( $v ) ? $v : array();
	}

	
	public static function log( $page_id ) {
		$id = sanitize_key( (string) $page_id );
		if ( '' === $id ) {
			return;
		}
		$all = self::rows();
		$now = time();
		if ( isset( $all[ $id ] ) && is_array( $all[ $id ] ) ) {
			$all[ $id ]['n']    = (int) $all[ $id ]['n'] + 1;
			$all[ $id ]['last'] = $now;
		} else {
			$all[ $id ] = array( 'n' => 1, 'first' => $now, 'last' => $now );
		}
		if ( count( $all ) > self::MAX ) {
			uasort( $all, static function ( $a, $b ) { return (int) $a['last'] <=> (int) $b['last']; } );
			$all = array_slice( $all, count( $all ) - self::MAX, null, true );
		}
		update_option( self::OPTION, $all, false );
	}

	
	public static function clear( $page_id ) {
		$id  = sanitize_key( (string) $page_id );
		$all = self::rows();
		if ( ! isset( $all[ $id ] ) ) {
			return;
		}
		unset( $all[ $id ] );
		if ( empty( $all ) ) {
			delete_option( self::OPTION );
		} else {
			update_option( self::OPTION, $all, false );
		}
	}

	
	public static function observe( $page_id, array $envelope, array $request ) {
		if ( isset( $envelope['error'] ) ) {
			return;
		}
		$filtered = ( (int) ( $request['page'] ?? 1 ) > 1 ) || '' !== trim( (string) ( $request['search'] ?? '' ) );
		if ( $filtered ) {
			return;
		}
		$rows  = isset( $envelope['rows_assoc'] ) ? (array) $envelope['rows_assoc'] : ( isset( $envelope['rows'] ) ? (array) $envelope['rows'] : array() );
		$total = isset( $envelope['total'] ) ? (int) $envelope['total'] : count( $rows );
		if ( 0 === $total && empty( $rows ) ) {
			self::log( $page_id );
		} else {
			self::clear( $page_id );
		}
	}
}