<?php
/**
 * Probes PHP, database and hosting limits. Feeds preflight checks and time budgets.
 *
 * @package AccessNow\Replica
 */

namespace AccessNow\Replica;

use AccessNow\Replica\Util\Paths;

defined( 'ABSPATH' ) || exit;

/**
 * Environment facts.
 */
final class Environment {

	/**
	 * Whether a PHP function exists and is not disabled by the host.
	 *
	 * @param string $name Function name.
	 */
	public static function can_call( $name ) {
		if ( ! function_exists( $name ) ) {
			return false;
		}
		$disabled = array_map( 'trim', explode( ',', strtolower( (string) ini_get( 'disable_functions' ) ) ) );
		return ! in_array( strtolower( $name ), $disabled, true );
	}

	/**
	 * memory_limit in bytes (0 = unlimited).
	 */
	public static function memory_limit() {
		$limit = (string) ini_get( 'memory_limit' );
		if ( '' === $limit || '-1' === $limit ) {
			return 0;
		}
		return (int) wp_convert_hr_to_bytes( $limit );
	}

	/**
	 * max_execution_time in seconds (0 = unlimited).
	 */
	public static function max_execution_time() {
		return (int) ini_get( 'max_execution_time' );
	}

	/**
	 * Whether this site runs on a local development host.
	 */
	public static function is_local_site() {
		$host = (string) wp_parse_url( home_url(), PHP_URL_HOST );
		return self::is_local_host( $host );
	}

	/**
	 * Whether a host name is local (localhost, loopback, .test, .local).
	 *
	 * @param string $host Host.
	 */
	public static function is_local_host( $host ) {
		$host = strtolower( trim( (string) $host, '[]' ) );
		return in_array( $host, array( 'localhost', '127.0.0.1', '::1' ), true )
			|| (bool) preg_match( '/\.(test|local|localhost)$/', $host );
	}

	/**
	 * Seconds one job slice may run for.
	 */
	public static function slice_seconds() {
		$setting = (int) Settings::get( 'slice_seconds' );
		$slice   = $setting > 0 ? $setting : ( self::is_local_site() ? 20 : 15 );
		if ( defined( 'WP_CLI' ) && WP_CLI ) {
			$slice = max( $slice, 120 );
		}
		$max = self::max_execution_time();
		if ( $max > 0 ) {
			$slice = min( $slice, max( 5, $max - 8 ) );
		}
		return $slice;
	}

	/**
	 * Site, PHP and database facts (used by preflight and the hello operation).
	 *
	 * @return array<string, mixed>
	 */
	public static function facts() {
		global $wpdb, $wp_version;

		$db_version = (string) $wpdb->get_var( 'SELECT VERSION()' ); // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- Server version, read once for the preflight report.

		return array(
			'site'  => array(
				'home'        => home_url(),
				'siteurl'     => site_url(),
				'abspath'     => wp_normalize_path( ABSPATH ),
				'content_dir' => Paths::content_dir(),
				'content_url' => content_url(),
				'uploads_dir' => Paths::uploads_dir(),
				'uploads_url' => wp_upload_dir( null, false )['baseurl'],
				'plugins_dir' => Paths::plugins_dir(),
				'mu_dir'      => Paths::mu_plugins_dir(),
				'themes_dir'  => Paths::themes_dir(),
				'prefix'      => $wpdb->prefix,
				'base_prefix' => $wpdb->base_prefix,
				'multisite'   => is_multisite(),
				'wp_version'  => $wp_version,
				'db_version'  => (int) get_option( 'db_version' ),
				'template'    => get_option( 'template' ),
				'stylesheet'  => get_option( 'stylesheet' ),
				'locale'      => get_locale(),
				'name'        => get_bloginfo( 'name' ),
				'active_plugins' => array_values( (array) get_option( 'active_plugins', array() ) ),
			),
			'php'   => array(
				'version'            => PHP_VERSION,
				'sapi'               => PHP_SAPI,
				'os'                 => PHP_OS,
				'memory_limit'       => self::memory_limit(),
				'max_execution_time' => self::max_execution_time(),
				'set_time_limit'     => self::can_call( 'set_time_limit' ),
				'disk_free_space'    => self::can_call( 'disk_free_space' ),
				'open_basedir'       => (string) ini_get( 'open_basedir' ),
				'zlib'               => function_exists( 'gzencode' ),
				'gcm'                => Secrets::has_gcm(),
				'curl'               => function_exists( 'curl_init' ),
				'server_software'    => isset( $_SERVER['SERVER_SOFTWARE'] ) ? sanitize_text_field( wp_unslash( $_SERVER['SERVER_SOFTWARE'] ) ) : '',
			),
			'db'    => array(
				'version'            => $db_version,
				'mariadb'            => false !== stripos( $db_version, 'mariadb' ),
				'charset'            => $wpdb->charset,
				'collate'            => $wpdb->collate,
				'max_allowed_packet' => (int) $wpdb->get_var( 'SELECT @@max_allowed_packet' ), // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- A server setting, read once for the preflight report.
				'lower_case_table_names' => (int) $wpdb->get_var( 'SELECT @@lower_case_table_names' ),
				'mysqli'             => $wpdb->dbh instanceof \mysqli,
			),
			'plugin' => array(
				'version'  => ACCESSNOW_REPLICA_VERSION,
				'protocol' => ACCESSNOW_REPLICA_PROTOCOL,
			),
			'time'  => time(),
		);
	}
}