<?php
/**
 * Environment and address checks.
 *
 * @package StandChat
 */

namespace StandChat;

defined( 'ABSPATH' ) || exit;

/**
 * Knows whether this WordPress is production and whether its address still
 * matches the Stand Site it's connected to.
 *
 * Stand shows chat only on the Site's domain, which it compares by host:
 * lowercase, without scheme, port, path or a leading "www.". Subdomains count.
 */
final class Environment {

	/**
	 * Normalizes a host or URL the way Stand compares a page with its Site
	 * (the page's host, then SiteService.normalizeDomain): ports don't count.
	 *
	 * @param string $value Host or URL.
	 */
	public static function normalize_domain( string $value ): string {
		$domain = strtolower( trim( $value ) );
		if ( 0 === strpos( $domain, 'https://' ) ) {
			$domain = substr( $domain, 8 );
		} elseif ( 0 === strpos( $domain, 'http://' ) ) {
			$domain = substr( $domain, 7 );
		}
		$domain = (string) strtok( $domain, '/?#' );
		$at     = strrpos( $domain, '@' );
		if ( false !== $at ) {
			$domain = substr( $domain, $at + 1 );
		}
		$domain = 0 === strpos( $domain, '[' ) ? (string) strtok( $domain, ']' ) . ']' : (string) preg_replace( '/:\d*$/', '', $domain );
		if ( 0 === strpos( $domain, 'www.' ) ) {
			$domain = substr( $domain, 4 );
		}
		return $domain;
	}

	/**
	 * This WordPress site's domain, normalized.
	 */
	public static function home_domain(): string {
		return self::normalize_domain( home_url() );
	}

	/**
	 * The environment type from wp_get_environment_type(): production, staging, development or local.
	 */
	public static function type(): string {
		return wp_get_environment_type();
	}

	/**
	 * Whether this is a production install.
	 */
	public static function is_production(): bool {
		return 'production' === self::type();
	}

	/**
	 * The domain of the connected Stand Site, if known.
	 */
	public static function site_domain(): string {
		$connection = Connection::stored_metadata();
		return empty( $connection['site']['domain'] ) ? '' : self::normalize_domain( (string) $connection['site']['domain'] );
	}

	/**
	 * Whether WordPress now runs on another address than the connected Site.
	 */
	public static function domain_mismatch(): bool {
		$site = self::site_domain();
		return '' !== $site && self::home_domain() !== $site;
	}

	/**
	 * Why chat is hidden on this environment, or '' when it isn't.
	 *
	 * @return string '', 'non_production' or 'domain_mismatch'.
	 */
	public static function hidden_reason(): string {
		if ( ! self::is_production() ) {
			// On staging and local copies the owner chooses: hide (default), the demo, or print anyway.
			return 'hide' === Settings::get( 'non_production' ) ? 'non_production' : '';
		}
		// Stand wouldn't show chat on another address, so nothing is printed there.
		return self::domain_mismatch() ? 'domain_mismatch' : '';
	}

	/**
	 * Whether a copy that isn't live prints the Site's script, as set to, on
	 * another address than the Site's: Stand shows no chat there.
	 *
	 * @param array<string, mixed> $settings   Settings.
	 * @param bool                 $production Whether this is a production install.
	 */
	public static function prints_elsewhere( array $settings, bool $production ): bool {
		return ! $production && 'print' === ( $settings['non_production'] ?? '' ) && self::domain_mismatch();
	}

	/**
	 * Path prefix for subdirectory multisite installs ("/blog2"), or ''.
	 * Stand matches paths from the domain root, so Behavior rules and page
	 * patterns for a subsite need this prefix.
	 */
	public static function path_prefix(): string {
		$path = wp_parse_url( home_url( '/' ), PHP_URL_PATH );
		$path = is_string( $path ) ? untrailingslashit( $path ) : '';
		return '/' === $path ? '' : $path;
	}

	/**
	 * Whether this is a subsite of a subdirectory multisite network.
	 */
	public static function is_subdirectory_subsite(): bool {
		return is_multisite() && ! is_subdomain_install() && '' !== self::path_prefix();
	}
}