<?php
/**
 * The core plugin config class.
 *
 * This maintains all the options and settings for this plugin.
 *
 * @since       1.0.0
 * @package     LiteSpeed
 */

namespace LiteSpeed;

defined('WPINC') || exit();

/**
 * Class Conf
 *
 * Maintains all LiteSpeed plugin configuration, including CRUD for single-site
 * and multisite options, upgrade flows, and side effects like purging/cron.
 */
class Conf extends Base {

	const TYPE_SET = 'set';

	/**
	 * IDs that were updated during a save cycle.
	 *
	 * @var array<string|int,mixed>
	 */
	private $_updated_ids = [];

	/**
	 * Whether current blog is the network primary site.
	 *
	 * @var bool
	 */
	private $_is_primary = false;

	/**
	 * Specify init logic to avoid infinite loop when calling conf.cls instance
	 *
	 * @since  3.0
	 * @access public
	 * @return void
	 */
	public function init() {
		// Check if conf exists or not. If not, create them in DB (won't change version if is converting v2.9- data)
		// Conf may be stale, upgrade later
		$this->_conf_db_init();

		/**
		 * Detect if has quic.cloud set
		 *
		 * @since  2.9.7
		 */
		if ( $this->conf( self::O_CDN_QUIC ) ) {
			if ( ! defined( 'LITESPEED_ALLOWED' ) ) {
				define( 'LITESPEED_ALLOWED', true );
			}
		}

		add_action( 'litespeed_conf_append', [ $this, 'option_append' ], 10, 2 );
		add_action( 'litespeed_conf_force', [ $this, 'force_option' ], 10, 2 );

		$this->define_cache();
	}

	/**
	 * Init conf related data
	 *
	 * @since  3.0
	 * @access private
	 * @return void
	 */
	private function _conf_db_init() {
		/**
		 * Try to load options first, network sites can override this later
		 *
		 * NOTE: Load before run `conf_upgrade()` to avoid infinite loop when getting conf in `conf_upgrade()`
		 */
		$this->load_options();

		// Check if debug is on
		// Init debug as early as possible
		if ( $this->conf( Base::O_DEBUG ) ) {
			$this->cls( 'Debug2' )->init();
		}

		$ver = $this->conf( self::_VER );

		/**
		 * Version is less than v3.0, or, is a new installation
		 */
		$ver_check_tag = 'new';
		if ( $ver ) {
			if ( ! defined( 'LSCWP_CUR_V' ) ) {
				define( 'LSCWP_CUR_V', $ver );
			}

			/**
			 * Upgrade conf
			 */
			if ( Core::VER !== $ver ) {
				// Plugin version will be set inside
				// Site plugin upgrade & version change will do in load_site_conf
				$ver_check_tag = Data::cls()->conf_upgrade( $ver );
			}
		}

		/**
		 * Sync latest new options
		 */
		if ( ! $ver || Core::VER !== $ver ) {
			// Load default values
			$this->load_default_vals();

			if ( ! $ver ) {
				// New install
				$this->set_conf( self::$_default_options );

				$ver_check_tag .= ' activate' . ( defined( 'LSCWP_REF' ) ? '_' . constant( 'LSCWP_REF' ) : '' );
			}

			// Init new default/missing options
			foreach ( self::$_default_options as $k => $v ) {
				// If the option existed, bypass updating
				// Bcos we may ask clients to deactivate for debug temporarily, we need to keep the current cfg in deactivation, hence we need to only try adding default cfg when activating.
				self::add_option( $k, $v );
			}

			// Force correct version in case a rare unexpected case that `_ver` exists but empty
			self::update_option( Base::_VER, Core::VER );

			if ( $ver_check_tag ) {
				Cloud::version_check( $ver_check_tag );
			}
		}

		/**
		 * Network sites only
		 *
		 * Override conf if is network subsites and chose `Use Primary Config`
		 */
		$this->_try_load_site_options();

		// Check if debug is on
		// Init debug as early as possible
		if ( $this->conf( Base::O_DEBUG ) ) {
			$this->cls( 'Debug2' )->init();
		}

		// Mark as conf loaded
		if ( ! defined( 'LITESPEED_CONF_LOADED' ) ) {
			define( 'LITESPEED_CONF_LOADED', true );
		}

		if ( ! $ver || Core::VER !== $ver ) {
			// Only trigger once in upgrade progress, don't run always
			$this->update_confs(); // Files only get corrected in activation or saving settings actions.
		}
	}

	/**
	 * Load all latest options from DB
	 *
	 * @since  3.0
	 * @access public
	 *
	 * @param int|null $blog_id Blog ID to load from. Null for current.
	 * @param bool     $dry_run Return options instead of setting them.
	 * @return array<string,mixed>|void
	 */
	public function load_options( $blog_id = null, $dry_run = false ) {
		$options = [];
		foreach ( self::$_default_options as $k => $v ) {
			if ( null !== $blog_id ) {
				$options[ $k ] = self::get_blog_option( $blog_id, $k, $v );
			} else {
				$options[ $k ] = self::get_option( $k, $v );
			}

			// Correct value type
			$options[ $k ] = $this->type_casting( $options[ $k ], $k );
		}

		if ( $dry_run ) {
			return $options;
		}

		// Bypass site special settings
		if ( null !== $blog_id ) {
			// This is to load the primary settings ONLY
			// These options are the ones that can be overwritten by primary
			$options = array_diff_key( $options, array_flip( self::$single_site_options ) );

			$this->set_primary_conf( $options );
		} else {
			$this->set_conf( $options );
		}

		// Append const options
		if ( defined( 'LITESPEED_CONF' ) && LITESPEED_CONF ) {
			foreach ( self::$_default_options as $k => $v ) {
				$const = Base::conf_const( $k );
				if ( defined( $const ) ) {
					$this->set_const_conf( $k, $this->type_casting( constant( $const ), $k ) );
				}
			}
		}
	}

	/**
	 * For multisite installations, the single site options need to be updated with the network wide options.
	 *
	 * @since 1.0.13
	 * @access private
	 * @return void
	 */
	private function _try_load_site_options() {
		if ( ! $this->_if_need_site_options() ) {
			return;
		}

		$this->_conf_site_db_init();

		$this->_is_primary = BLOG_ID_CURRENT_SITE === get_current_blog_id();

		// If network set to use primary setting
		if ( $this->network_conf( self::NETWORK_O_USE_PRIMARY ) && ! $this->_is_primary ) {
			// subsites or network admin
			// Get the primary site settings
			// If it's just upgraded, 2nd blog is being visited before primary blog, can just load default config (won't hurt as this could only happen shortly)
			$this->load_options( BLOG_ID_CURRENT_SITE );
		}

		// Overwrite single blog options with site options
		foreach ( self::$_default_options as $k => $v ) {
			if ( ! $this->has_network_conf( $k ) ) {
				continue;
			}
			// $this->_options[ $k ] = $this->_network_options[ $k ];

			// Special handler to `Enable Cache` option if the value is set to OFF
			if ( self::O_CACHE === $k ) {
				if ( $this->_is_primary ) {
					if ( $this->conf( $k ) !== $this->network_conf( $k ) ) {
						if ( self::VAL_ON2 !== $this->conf( $k ) ) {
							continue;
						}
					}
				} elseif ( $this->network_conf( self::NETWORK_O_USE_PRIMARY ) ) {
					if ( $this->has_primary_conf( $k ) && self::VAL_ON2 !== $this->primary_conf( $k ) ) {
						// This case will use primary_options override always
						continue;
					}
				} elseif ( self::VAL_ON2 !== $this->conf( $k ) ) {
					continue;
				}
			}

			// primary_options will store primary settings + network settings, OR, store the network settings for subsites
			$this->set_primary_conf( $k, $this->network_conf( $k ) );
		}
		// var_dump($this->_options);
	}

	/**
	 * Check if needs to load site_options for network sites
	 *
	 * @since  3.0
	 * @access private
	 * @return bool
	 */
	private function _if_need_site_options() {
		if ( ! is_multisite() ) {
			return false;
		}

		// Check if needs to use site_options or not
		// todo: check if site settings are separate bcos it will affect .htaccess

		/**
		 * In case this is called outside the admin page
		 *
		 * @see  https://codex.wordpress.org/Function_Reference/is_plugin_active_for_network
		 * @since  2.0
		 */
		if ( ! function_exists( 'is_plugin_active_for_network' ) ) {
			require_once ABSPATH . '/wp-admin/includes/plugin.php';
		}
		// If is not activated on network, it will not have site options
		if ( ! is_plugin_active_for_network( Core::PLUGIN_FILE ) ) {
			if ( self::VAL_ON2 === (int) $this->conf( self::O_CACHE ) ) {
				// Default to cache on
				$this->set_conf( self::_CACHE, true );
			}
			return false;
		}

		return true;
	}

	/**
	 * Init site conf and upgrade if necessary
	 *
	 * @since 3.0
	 * @access private
	 * @return void
	 */
	private function _conf_site_db_init() {
		$this->load_site_options();

		$ver = $this->network_conf( self::_VER );

		/**
		 * Don't upgrade or run new installations other than from backend visit
		 * In this case, just use default conf
		 */
		if ( ! $ver || Core::VER !== $ver ) {
			if ( ! is_admin() && ! defined( 'LITESPEED_CLI' ) ) {
				$this->set_network_conf( $this->load_default_site_vals() );
				return;
			}
		}

		/**
		 * Upgrade conf
		 */
		if ( $ver && Core::VER !== $ver ) {
			// Site plugin version will change inside
			Data::cls()->conf_site_upgrade( $ver );
		}

		/**
		 * Is a new installation
		 */
		if ( ! $ver || Core::VER !== $ver ) {
			// Load default values
			$this->load_default_site_vals();

			// Init new default/missing options
			foreach ( self::$_default_site_options as $k => $v ) {
				// If the option existed, bypass updating
				self::add_site_option( $k, $v );
			}
		}
	}

	/**
	 * Get the plugin's site wide options.
	 *
	 * If the site wide options are not set yet, set it to default.
	 *
	 * @since 1.0.2
	 * @access public
	 * @return null|void
	 */
	public function load_site_options() {
		if ( ! is_multisite() ) {
			return null;
		}

		// Load all site options
		foreach ( self::$_default_site_options as $k => $v ) {
			$val = self::get_site_option( $k, $v );
			$val = $this->type_casting( $val, $k, true );
			$this->set_network_conf( $k, $val );
		}
	}

	/**
	 * Append a 3rd party option to default options
	 *
	 * This will not be affected by network use primary site setting.
	 *
	 * NOTE: If it is a multi switch option, need to call `_conf_multi_switch()` first
	 *
	 * @since  3.0
	 * @access public
	 *
	 * @param string $name        Option name.
	 * @param mixed  $default_val Default value.
	 * @return void
	 */
	public function option_append( $name, $default_val ) {
		self::$_default_options[ $name ] = $default_val;
		$this->set_conf( $name, self::get_option( $name, $default_val ) );
		$this->set_conf( $name, $this->type_casting( $this->conf( $name ), $name ) );
	}

	/**
	 * Force an option to a certain value
	 *
	 * @since  2.6
	 * @access public
	 *
	 * @param string $k Option key.
	 * @param mixed  $v Option value.
	 * @return void
	 */
	public function force_option( $k, $v ) {
		if ( ! $this->has_conf( $k ) ) {
			return;
		}

		$v = $this->type_casting( $v, $k );

		if ( $this->conf( $k ) === $v ) {
			return;
		}

		// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_var_export
		Debug2::debug( '[Conf] ** ' . $k . ' forced from ' . var_export( $this->conf( $k ), true ) . ' to ' . var_export( $v, true ) );

		$this->set_conf( $k, $v );
	}

	/**
	 * Define `_CACHE` const in options ( for both single and network )
	 *
	 * @since  3.0
	 * @access public
	 * @return void
	 */
	public function define_cache() {
		// Init global const cache on setting
		$this->set_conf( self::_CACHE, false );
		if ( self::VAL_ON === (int) $this->conf( self::O_CACHE ) || $this->conf( self::O_CDN_QUIC ) ) {
			$this->set_conf( self::_CACHE, true );
		}

		// Check network
		if ( ! $this->_if_need_site_options() ) {
			// Set cache on
			$this->_define_cache_on();
			return;
		}

		// If use network setting
		if ( self::VAL_ON2 === (int) $this->conf( self::O_CACHE ) && $this->network_conf( self::O_CACHE ) ) {
			$this->set_conf( self::_CACHE, true );
		}

		$this->_define_cache_on();
	}

	/**
	 * Define `LITESPEED_ON`
	 *
	 * @since 2.1
	 * @access private
	 * @return void
	 */
	private function _define_cache_on() {
		if ( ! $this->conf( self::_CACHE ) ) {
			return;
		}

		if ( defined( 'LITESPEED_ALLOWED' ) && ! defined( 'LITESPEED_ON' ) ) {
			define( 'LITESPEED_ON', true );
		}
	}

	/**
	 * Save option
	 *
	 * @since  3.0
	 * @access public
	 *
	 * @param array<string,mixed> $the_matrix Option-value map.
	 * @return void
	 */
	public function update_confs( $the_matrix = [] ) {
		if ( $the_matrix ) {
			foreach ( $the_matrix as $id => $val ) {
				$this->update( $id, $val );
			}
		}

		if ( $this->_updated_ids ) {
			foreach ( $this->_updated_ids as $id ) {
				// Check if need to do a purge all or not
				if ( $this->_conf_purge_all( $id ) ) {
					Purge::purge_all( 'conf changed [id] ' . $id );
				}

				// Check if need to purge a tag
				$tag = $this->_conf_purge_tag( $id );
				if ( $tag ) {
					Purge::add( $tag );
				}

				// Update cron
				if ( $this->_conf_cron( $id ) ) {
					$this->cls( 'Task' )->try_clean( $id );
				}

				// Reset crawler bypassed list when any of the options WebP replace, guest mode, or cache mobile got changed
				if ( self::O_IMG_OPTM_WEBP === $id || self::O_GUEST === $id || self::O_CACHE_MOBILE === $id ) {
					$this->cls( 'Crawler' )->clear_disabled_list();
				}
			}
		}

		do_action( 'litespeed_update_confs', $the_matrix );

		// Update related tables
		$this->cls( 'Data' )->correct_tb_existence();

		// Update related files
		$this->cls( 'Activation' )->update_files();

		/**
		 * CDN related actions - Cloudflare
		 */
		$this->cls( 'CDN\Cloudflare' )->try_refresh_zone();

		// If Server IP changed, must test echo
		if ( in_array( self::O_SERVER_IP, $this->_updated_ids, true ) ) {
			$this->cls( 'Cloud' )->init_qc_cli();
		}

		// CDN related actions - QUIC.cloud
		$this->cls( 'CDN\Quic' )->try_sync_conf();
	}

	/**
	 * Save option
	 *
	 * Note: this is direct save, won't trigger corresponding file update or data sync. To save settings normally, always use `Conf->update_confs()`
	 *
	 * @since  3.0
	 * @access public
	 *
	 * @param string $id  Option ID.
	 * @param mixed  $val Option value.
	 * @return void
	 */
	public function update( $id, $val ) {
		// Bypassed this bcos $this->_options could be changed by force_option()
		// if ( $this->_options[ $id ] === $val ) {
		// return;
		// }

		if ( self::_VER === $id ) {
			return;
		}

		if ( self::O_SERVER_IP === $id ) {
			if ( $val && ! Utility::valid_ipv4( $val ) ) {
				$msg = sprintf( __( 'Saving option failed. IPv4 only for %s.', 'litespeed-cache' ), Lang::title( Base::O_SERVER_IP ) );
				Admin_Display::error( $msg );
				return;
			}
		}

		if ( ! array_key_exists( $id, self::$_default_options ) ) {
			if ( defined( 'LSCWP_LOG' ) ) {
				Debug2::debug( '[Conf] Invalid option ID ' . $id );
			}
			return;
		}

		if ( $val && $this->_conf_pswd( $id ) && ! preg_match( '/[^\*]/', (string) $val ) ) {
			return;
		}

		// Special handler for CDN Original URLs
		if ( self::O_CDN_ORI === $id && ! $val ) {
			$site_url = site_url( '/' );
			$parsed   = wp_parse_url( $site_url );
			if ( !empty( $parsed['scheme'] ) ) {
				$site_url = str_replace( $parsed['scheme'] . ':', '', $site_url );
			}

			$val = $site_url;
		}

		// Validate type
		$val = $this->type_casting( $val, $id );

		// Save data
		self::update_option( $id, $val );

		// Handle purge if setting changed
		if ( $this->conf( $id ) !== $val ) {
			$this->_updated_ids[] = $id;

			// Check if need to fire a purge or not (Here has to stay inside `update()` bcos need comparing old value)
			if ( $this->_conf_purge( $id ) ) {
				$old  = (array) $this->conf( $id );
				$new  = (array) $val;
				$diff = array_merge( array_diff( $new, $old ), array_diff( $old, $new ) );
				// If has difference
				foreach ( $diff as $v ) {
					$v = ltrim( (string) $v, '^' );
					$v = rtrim( (string) $v, '$' );
					$this->cls( 'Purge' )->purge_url( $v );
				}
			}
		}

		// Update in-memory data
		$this->set_conf( $id, $val );
	}

	/**
	 * Save network option
	 *
	 * @since  3.0
	 * @access public
	 *
	 * @param string $id  Option ID.
	 * @param mixed  $val Option value.
	 * @return void
	 */
	public function network_update( $id, $val ) {
		if ( ! array_key_exists( $id, self::$_default_site_options ) ) {
			if ( defined( 'LSCWP_LOG' ) ) {
				Debug2::debug( '[Conf] Invalid network option ID ' . $id );
			}
			return;
		}

		if ( $val && $this->_conf_pswd( $id ) && ! preg_match( '/[^\*]/', (string) $val ) ) {
			return;
		}

		// Validate type
		if ( is_bool( self::$_default_site_options[ $id ] ) ) {
			$max = $this->_conf_multi_switch( $id );
			if ( $max && $val > 1 ) {
				$val %= ( $max + 1 );
			} else {
				$val = (bool) $val;
			}
		} elseif ( is_array( self::$_default_site_options[ $id ] ) ) {
			// from textarea input
			if ( ! is_array( $val ) ) {
				$val = Utility::sanitize_lines( $val, $this->_conf_filter( $id ) );
			}
		} elseif ( ! is_string( self::$_default_site_options[ $id ] ) ) {
			$val = (int) $val;
		} else {
			// Check if the string has a limit set
			$val = $this->_conf_string_val( $id, $val );
		}

		// Save data
		self::update_site_option( $id, $val );

		// Handle purge if setting changed
		if ( $this->network_conf( $id ) !== $val ) {
			// Check if need to do a purge all or not
			if ( $this->_conf_purge_all( $id ) ) {
				Purge::purge_all( '[Conf] Network conf changed [id] ' . $id );
			}

			// Update in-memory data
			$this->set_network_conf( $id, $val );
		}

		// No need to update cron here, Cron will register in each init

		if ( $this->has_conf( $id ) ) {
			$this->set_conf( $id, $val );
		}
	}

	/**
	 * Check if one user role is in exclude optimization group settings
	 *
	 * @since 1.6
	 * @access public
	 *
	 * @param  string|null $role The user role.
	 * @return string|false      The set value if already set, otherwise false.
	 */
	public function in_optm_exc_roles( $role = null ) {
		// Get user role
		if ( null === $role ) {
			$role = Router::get_role();
		}

		if ( ! $role ) {
			return false;
		}

		$roles = explode( ',', $role );
		$found = array_intersect( $roles, $this->conf( self::O_OPTM_EXC_ROLES ) );

		return $found ? implode( ',', $found ) : false;
	}

	/**
	 * Set one config value directly
	 *
	 * @since  2.9
	 * @access private
	 * @return void
	 */
	private function _set_conf() {
		/**
		 * NOTE: For URL Query String setting,
		 *      1. If append lines to an array setting e.g. `cache-force_uri`, use `set[cache-force_uri][]=the_url`.
		 *      2. If replace the array setting with one line, use `set[cache-force_uri]=the_url`.
		 *      3. If replace the array setting with multi lines value, use 2 then 1.
		 */
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended, WordPress.Security.ValidatedSanitizedInput
		$raw = !empty( $_GET[ self::TYPE_SET ] ) ? $_GET[ self::TYPE_SET ] : false;
		if ( !$raw || ! is_array( $raw ) ) {
			return;
		}

		// Sanitize the incoming matrix.
		$the_matrix = [];
		foreach ( $raw as $id => $v ) {
			if ( ! $this->has_conf( $id ) ) {
				continue;
			}

			// Append new item to array type settings
			if ( is_array( $v ) && is_array( $this->conf( $id ) ) ) {
				$v = array_merge( $this->conf( $id ), $v );

				// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_var_export
				Debug2::debug( '[Conf] Appended to settings [' . $id . ']: ' . var_export( $v, true ) );
			} else {
				// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_var_export
				Debug2::debug( '[Conf] Set setting [' . $id . ']: ' . var_export( $v, true ) );
			}

			$the_matrix[ $id ] = $v;
		}

		if ( !$the_matrix ) {
			return;
		}

		$this->update_confs( $the_matrix );

		$msg = __( 'Changed setting successfully.', 'litespeed-cache' );
		Admin_Display::success( $msg );

		// Redirect if changed frontend URL
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
		$redirect = ! empty( $_GET['redirect'] ) ? sanitize_text_field( wp_unslash( $_GET['redirect'] ) ) : '';
		if ( $redirect ) {
			wp_safe_redirect( $redirect );
			exit;
		}
	}

	/**
	 * Handle all request actions from main cls
	 *
	 * @since  2.9
	 * @access public
	 * @return void
	 */
	public function handler() {
		$type = Router::verify_type();

		switch ( $type ) {
			case self::TYPE_SET:
				$this->_set_conf();
				break;

			default:
				break;
		}

		Admin::redirect();
	}
}
