<?php
/**
 * Anonymous statistics, only when the site owner turns them on (Settings → Anonymous statistics; off by default,
 * never asked for on any screen). Once a week the site sends counts of the kinds of problems Fixlight found and
 * fixed, the theme's folder name, the page builder, whether WooCommerce is active and version numbers. Never the
 * site's address, pages, content or anything about its visitors. A random id, made when sharing is turned on and
 * deleted when it is turned off, lets a week's numbers replace the last week's.
 *
 * @package Fixlight
 */

namespace Fixlight;

defined( 'ABSPATH' ) || exit;

/**
 * Opt-in statistics.
 */
class Stats {

	/**
	 * Option: the random id for this install (only while sharing is on).
	 */
	const ID = 'fixlight_stats_id';

	/**
	 * Option: when the counts were last sent.
	 */
	const SENT = 'fixlight_stats_sent';

	/**
	 * Hooks.
	 */
	public static function init() {
		add_action( Background::DAILY_HOOK, array( __CLASS__, 'maybe_send' ), 20 );
		add_action( 'update_option_' . Settings::OPTION, array( __CLASS__, 'settings_changed' ), 10, 2 );
	}

	/**
	 * Makes or forgets the id when sharing is turned on or off.
	 *
	 * @param mixed $old_value Previous settings.
	 * @param mixed $value     New settings.
	 */
	public static function settings_changed( $old_value, $value ) {
		$on = is_array( $value ) && ! empty( $value['share_stats'] );
		if ( $on && ! get_option( self::ID ) ) {
			update_option( self::ID, wp_generate_uuid4(), false );
		}
		if ( ! $on ) {
			delete_option( self::ID );
			delete_option( self::SENT );
		}
	}

	/**
	 * Sends the week's counts when sharing is on and a week has passed (daily cron).
	 *
	 * @param int|null $now Current time (tests).
	 * @return bool Whether the counts were sent.
	 */
	public static function maybe_send( $now = null ) {
		$now = null === $now ? time() : (int) $now;
		if ( ! Settings::get( 'share_stats' ) ) {
			return false;
		}
		// The first save on a new site goes through add_option, which settings_changed doesn't see.
		if ( ! get_option( self::ID ) ) {
			update_option( self::ID, wp_generate_uuid4(), false );
		}
		if ( $now - (int) get_option( self::SENT, 0 ) < 6 * DAY_IN_SECONDS ) {
			return false;
		}
		$response = wp_remote_post(
			Ai_Hosted::base_url() . '/v1/stats',
			array(
				'timeout' => 10,
				'headers' => array( 'Content-Type' => 'application/json' ),
				'body'    => wp_json_encode( self::payload() ),
			)
		);
		$code     = is_wp_error( $response ) ? 0 : (int) wp_remote_retrieve_response_code( $response );
		if ( $code >= 200 && $code < 300 ) {
			update_option( self::SENT, $now, false );
			return true;
		}
		return false;
	}

	/**
	 * What is sent: counts and names of kinds only.
	 *
	 * @return array
	 */
	public static function payload() {
		$summary = Store::summary();
		$rules   = array();
		foreach ( isset( $summary['rules'] ) ? (array) $summary['rules'] : array() as $rule ) {
			if ( isset( $rule['rule'] ) && preg_match( '/^[a-z0-9-]{2,60}$/', (string) $rule['rule'] ) ) {
				$rules[ $rule['rule'] ] = array(
					'found' => (int) $rule['before'],
					'left'  => (int) $rule['after'],
				);
			}
		}
		$fixes = array();
		foreach ( Settings::fixes() as $id => $on ) {
			if ( $on ) {
				$fixes[] = $id;
			}
		}
		return array(
			'id'          => (string) get_option( self::ID ),
			'version'     => FIXLIGHT_VERSION,
			'wp'          => self::major_minor( get_bloginfo( 'version' ) ),
			'php'         => self::major_minor( PHP_VERSION ),
			'theme'       => strtolower( substr( (string) get_template(), 0, 60 ) ),
			'builders'    => self::builders(),
			'woocommerce' => class_exists( 'WooCommerce' ),
			'pages'       => isset( $summary['pages'] ) ? (int) $summary['pages'] : 0,
			'fixes_on'    => $fixes,
			'rules'       => $rules,
		);
	}

	/**
	 * Page builders in use, by family.
	 *
	 * @return string[]
	 */
	public static function builders() {
		$template = strtolower( (string) get_template() );
		$found    = array();
		if ( defined( 'ELEMENTOR_VERSION' ) ) {
			$found[] = 'elementor';
		}
		if ( in_array( $template, array( 'divi', 'extra' ), true ) || defined( 'ET_BUILDER_PLUGIN_VERSION' ) ) {
			$found[] = 'divi';
		}
		if ( class_exists( 'FLBuilder' ) ) {
			$found[] = 'beaver';
		}
		if ( defined( 'WPB_VC_VERSION' ) ) {
			$found[] = 'wpbakery';
		}
		if ( 'bricks' === $template ) {
			$found[] = 'bricks';
		}
		if ( defined( 'CT_VERSION' ) ) {
			$found[] = 'oxygen';
		}
		if ( defined( '__BREAKDANCE_VERSION' ) ) {
			$found[] = 'breakdance';
		}
		if ( ! $found ) {
			$found[] = function_exists( 'wp_is_block_theme' ) && wp_is_block_theme() ? 'block-theme' : 'classic-theme';
		}
		return $found;
	}

	/**
	 * "7.1.3" → "7.1".
	 *
	 * @param string $version Version.
	 * @return string
	 */
	private static function major_minor( $version ) {
		return preg_match( '/^(\d+)\.(\d+)/', (string) $version, $m ) ? $m[1] . '.' . $m[2] : '';
	}
}