<?php
/**
 * Saved rules for the conditional shortcode.
 *
 * @package Yangra\Conditional
 */

namespace Yangra\Conditional\Shortcodes;

use Yangra\Conditional\Rules\RuleSanitizer;

defined( 'ABSPATH' ) || exit;

/**
 * Reads the saved rules that `[yangra_conditional rule="…"]` uses, from the
 * `yangra_conditional_saved_rules` option: an array keyed by the saved rule's
 * ID (12 lowercase letters and digits), each `array( 'name' => …, 'rule' => … )`
 * with the rule in the rule format.
 *
 * Reading is Free code, so shortcodes keep working when a Pro license lapses
 * (with Pro conditions skipped). Creating and editing saved rules is Pro.
 */
class SavedRules {

	const OPTION = 'yangra_conditional_saved_rules';

	/**
	 * Rule sanitizer.
	 *
	 * @var RuleSanitizer
	 */
	private $sanitizer;

	/**
	 * Constructor.
	 *
	 * @param RuleSanitizer $sanitizer Rule sanitizer.
	 */
	public function __construct( RuleSanitizer $sanitizer ) {
		$this->sanitizer = $sanitizer;
	}

	/**
	 * A saved rule, sanitized, or null when there's no saved rule with this ID.
	 *
	 * @param string $id Saved rule ID.
	 * @return array{version: int, enabled: bool, action: string, groups: array<int, array{id: string, conditions: array<int, array{id: string, type: string, operator: string, values: array<int, string>}>}>}|null
	 */
	public function get( string $id ): ?array {
		$saved = get_option( self::OPTION, array() );
		if ( '' === $id || ! is_array( $saved ) || ! isset( $saved[ $id ] ) || ! is_array( $saved[ $id ] ) || ! isset( $saved[ $id ]['rule'] ) ) {
			return null;
		}

		return $this->sanitizer->sanitize( $saved[ $id ]['rule'] );
	}

	/**
	 * Every saved rule with a valid ID, sanitized, sorted by name.
	 *
	 * @return array<int, array{id: string, name: string, rule: array{version: int, enabled: bool, action: string, groups: array<int, array{id: string, conditions: array<int, array{id: string, type: string, operator: string, values: array<int, string>}>}>}}>
	 */
	public function all(): array {
		$saved = get_option( self::OPTION, array() );
		if ( ! is_array( $saved ) ) {
			return array();
		}

		$rules = array();
		foreach ( $saved as $id => $item ) {
			if ( ! is_string( $id ) || 1 !== preg_match( '/^[a-z0-9]{12}$/', $id ) || ! is_array( $item ) || ! isset( $item['rule'] ) ) {
				continue;
			}

			$rules[] = array(
				'id'   => $id,
				'name' => isset( $item['name'] ) && is_string( $item['name'] ) ? $item['name'] : '',
				'rule' => $this->sanitizer->sanitize( $item['rule'] ),
			);
		}

		usort(
			$rules,
			static function ( array $a, array $b ): int {
				return array( strtolower( $a['name'] ), $a['id'] ) <=> array( strtolower( $b['name'] ), $b['id'] );
			}
		);

		return $rules;
	}
}