<?php
/**
 * Settings service.
 *
 * @package AceloraSiteAccelerator
 */

namespace Acelora\SiteAccelerator\Includes;

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

/**
 * Stores and sanitizes plugin configuration.
 */
class Settings {

	const OPTION = 'acelora_site_accelerator_settings';

	/**
	 * Cached settings.
	 *
	 * @var array|null
	 */
	private $settings = null;

	/**
	 * Default settings.
	 *
	 * @return array
	 */
	public static function defaults() {
		return array(
			'cache'       => array(
				'enabled'            => 1,
				'lifetime'           => 86400,
				'mobile_cache'       => 1,
				'logged_in_cache'    => 0,
				'excluded_urls'      => "/wp-admin\n/wp-login.php\n/cart\n/checkout\n/my-account",
				'excluded_cookies'   => "wordpress_logged_in_\ncomment_author_\nwoocommerce_items_in_cart\nwp_woocommerce_session_",
				'excluded_queries'   => "s\npreview\nnocache\nadd-to-cart",
				'excluded_roles'     => "administrator\neditor",
			),
			'preload'     => array(
				'enabled'      => 1,
				'batch_size'   => 8,
				'sitemap_urls' => '',
			),
			'browser'     => array(
				'enabled' => 1,
				'max_age' => 2592000,
				'etags'   => 1,
			),
			'css'         => array(
				'minify'       => 1,
				'critical_css' => '',
				'exclusions'   => '',
			),
			'js'          => array(
				'minify'     => 1,
				'defer'      => 1,
				'async'      => 0,
				'delay'      => 0,
				'exclusions' => "jquery\nwp-includes/js/dist",
			),
			'images'      => array(
				'optimize_uploads' => 1,
				'webp'             => 1,
				'quality'          => 82,
				'lazy'             => 1,
			),
			'database'    => array(
				'schedule' => 'weekly',
			),
			'heartbeat'   => array(
				'mode'      => 'reduce',
				'frequency' => 60,
				'admin'     => 1,
				'frontend'  => 0,
				'editor'    => 1,
			),
			'compression' => array(
				'enabled' => 1,
			),
			'lazy'        => array(
				'images'     => 1,
				'iframes'    => 1,
				'videos'     => 1,
				'exclusions' => '',
			),
			'cdn'         => array(
				'enabled'    => 0,
				'url'        => '',
				'exclusions' => '',
			),
			'logging'     => array(
				'enabled'        => 1,
				'retention_days' => 14,
			),
			'automation'  => array(
				'enabled'               => 1,
				'cache_cleanup'         => 'daily',
				'preload'               => 'daily',
				'database_optimization' => 'weekly',
				'one_click'             => 'weekly',
			),
		);
	}

	/**
	 * Ensure option exists.
	 *
	 * @return void
	 */
	public static function install_defaults() {
		$current = get_option( self::OPTION );

		if ( false === $current ) {
			add_option( self::OPTION, self::defaults(), '', false );
			add_option( 'acelora_site_accelerator_install_time', time(), '', false );
			return;
		}

		update_option( self::OPTION, self::merge_defaults( $current ), false );
	}

	/**
	 * Get all settings.
	 *
	 * @return array
	 */
	public function all() {
		if ( null === $this->settings ) {
			$stored         = get_option( self::OPTION, array() );
			$this->settings = self::merge_defaults( is_array( $stored ) ? $stored : array() );
		}

		return $this->settings;
	}

	/**
	 * Get a dot-notated setting.
	 *
	 * @param string $key     Dot-notated setting key.
	 * @param mixed  $default Default value.
	 * @return mixed
	 */
	public function get( $key, $default = null ) {
		$value = $this->all();

		foreach ( explode( '.', $key ) as $part ) {
			if ( ! is_array( $value ) || ! array_key_exists( $part, $value ) ) {
				return $default;
			}

			$value = $value[ $part ];
		}

		return $value;
	}

	/**
	 * Save settings.
	 *
	 * @param array $settings Settings.
	 * @return bool
	 */
	public function save( $settings ) {
		$clean          = self::sanitize( self::merge_defaults( $settings ) );
		$this->settings = $clean;

		return update_option( self::OPTION, $clean, false );
	}

	/**
	 * Merge stored values with defaults.
	 *
	 * @param array $settings Settings.
	 * @return array
	 */
	public static function merge_defaults( $settings ) {
		return array_replace_recursive( self::defaults(), is_array( $settings ) ? $settings : array() );
	}

	/**
	 * Sanitize settings recursively.
	 *
	 * @param array $settings Settings.
	 * @return array
	 */
	public static function sanitize( $settings ) {
		$defaults = self::defaults();
		$clean    = self::merge_defaults( $settings );

		foreach ( $defaults as $section => $fields ) {
			foreach ( $fields as $field => $default ) {
				$value = isset( $clean[ $section ][ $field ] ) ? $clean[ $section ][ $field ] : $default;

				if ( is_int( $default ) ) {
					$clean[ $section ][ $field ] = max( 0, absint( $value ) );
				} elseif ( in_array( $field, array( 'url' ), true ) ) {
					$clean[ $section ][ $field ] = esc_url_raw( untrailingslashit( $value ) );
				} elseif ( 'schedule' === $field || false !== strpos( $field, 'optimization' ) || in_array( $field, array( 'cache_cleanup', 'preload', 'one_click', 'mode' ), true ) ) {
					$clean[ $section ][ $field ] = sanitize_key( $value );
				} else {
					$clean[ $section ][ $field ] = is_string( $value ) ? sanitize_textarea_field( wp_unslash( $value ) ) : $value;
				}
			}
		}

		$clean['cache']['lifetime']       = max( 60, absint( $clean['cache']['lifetime'] ) );
		$clean['preload']['batch_size']  = max( 1, min( 50, absint( $clean['preload']['batch_size'] ) ) );
		$clean['images']['quality']      = max( 40, min( 100, absint( $clean['images']['quality'] ) ) );
		$clean['heartbeat']['frequency'] = max( 15, min( 300, absint( $clean['heartbeat']['frequency'] ) ) );
		$clean['browser']['max_age']     = max( 3600, absint( $clean['browser']['max_age'] ) );

		return $clean;
	}

	/**
	 * Convert newline-delimited settings to a cleaned list.
	 *
	 * @param string $value Raw list.
	 * @return array
	 */
	public function list_value( $value ) {
		$lines = preg_split( '/\r\n|\r|\n/', (string) $value );
		$lines = array_map( 'trim', $lines );
		$lines = array_filter( $lines );

		return array_values( array_unique( $lines ) );
	}
}