<?php
/**
 * Settings storage.
 *
 * @package ThreeDoor
 */

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

/**
 * Reads and writes the plugin settings.
 */
class ThreeDoor_Settings {

	const OPTION = 'threedoor_settings';

	/**
	 * Current settings, merged over the factory settings.
	 *
	 * @return array
	 */
	public static function get() {
		$defaults = ThreeDoor_Rules::defaults();
		$saved    = get_option( self::OPTION, array() );
		if ( ! is_array( $saved ) ) {
			$saved = array();
		}
		$settings          = array_merge( $defaults, $saved );
		$settings['doors'] = array_merge( $defaults['doors'], isset( $saved['doors'] ) ? (array) $saved['doors'] : array() );
		return $settings;
	}

	/**
	 * Save settings and empty REST caches, so the new rules apply at once.
	 *
	 * @param array $settings Settings.
	 * @return void
	 */
	public static function save( array $settings ) {
		update_option( self::OPTION, $settings, false );
		ThreeDoor_Cache::purge();
	}

	/**
	 * Settings from a submitted admin form. Expects unslashed input; only the section named in
	 * $input['section'] changes, everything else is kept from $current.
	 *
	 * @param array $input   Form fields.
	 * @param array $current Current settings.
	 * @return array
	 */
	public static function from_form( array $input, array $current ) {
		$section = isset( $input['section'] ) ? sanitize_key( $input['section'] ) : '';
		$out     = $current;

		if ( 'doors' === $section ) {
			$given = isset( $input['doors'] ) ? (array) $input['doors'] : array();
			foreach ( array_keys( ThreeDoor_Rules::defaults()['doors'] ) as $door ) {
				$out['doors'][ $door ] = ! empty( $given[ $door ] );
			}
		}
		if ( 'guest' === $section ) {
			$out['guest'] = array(
				'default' => ( isset( $input['guest_mode'] ) && 'deny' === $input['guest_mode'] ) ? 'deny' : 'allow',
				'allow'   => self::patterns( isset( $input['guest_allow'] ) ? $input['guest_allow'] : '' ),
				'deny'    => self::patterns( isset( $input['guest_deny'] ) ? $input['guest_deny'] : '' ),
			);
		}
		if ( 'role' === $section ) {
			$role  = isset( $input['role'] ) ? sanitize_key( $input['role'] ) : '';
			$roles = wp_roles()->get_names();
			if ( '' !== $role && 'administrator' !== $role && isset( $roles[ $role ] ) ) {
				$mode = isset( $input['role_mode'] ) ? (string) $input['role_mode'] : 'none';
				if ( in_array( $mode, array( 'allow', 'deny' ), true ) ) {
					$out['roles'][ $role ] = array(
						'default' => $mode,
						'allow'   => self::patterns( isset( $input['role_allow'] ) ? $input['role_allow'] : '' ),
						'deny'    => self::patterns( isset( $input['role_deny'] ) ? $input['role_deny'] : '' ),
					);
				} else {
					unset( $out['roles'][ $role ] );
				}
			}
		}
		if ( 'learn' === $section ) {
			$out['learn'] = ! empty( $input['learn'] );
		}
		return $out;
	}

	/**
	 * Route patterns from a textarea: one per line, # starts a comment.
	 *
	 * @param string $text Text.
	 * @return array
	 */
	public static function patterns( $text ) {
		$out = array();
		foreach ( (array) preg_split( '/\R/', (string) $text ) as $line ) {
			$line = trim( preg_replace( '#</?script[^>]*>#i', '', (string) $line ) );
			$line = trim( wp_strip_all_tags( $line ) );
			if ( '' === $line || '#' === $line[0] ) {
				continue;
			}
			$line = preg_replace( '#[^A-Za-z0-9_\-./*]#', '', $line );
			if ( '' === trim( (string) $line, '/' ) ) {
				continue;
			}
			$out[] = '/' . ltrim( (string) $line, '/' );
		}
		return array_values( array_unique( $out ) );
	}
}