<?php

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

if ( ! class_exists( 'AIEO_Runtime_TRS_Cache', false ) ) {
class AIEO_Runtime_TRS_Cache {

    
    private static $request_cache = array();

    
    public static function package_hash($instance_id, array $package, array $summary, $version) {
        $dest = isset($package['destination']) && is_array($package['destination']) ? $package['destination'] : array();

        $postcode = (string) ($dest['postcode'] ?? '');
        if (class_exists('AIEO_DMM_Smart_Shipping_Label') &&
            method_exists('AIEO_DMM_Smart_Shipping_Label', 'normalize_postcode')) {
            $postcode = (string) AIEO_DMM_Smart_Shipping_Label::normalize_postcode($postcode);
        }

        $key_parts = array(
            'i'  => (int) $instance_id,
            'co' => strtoupper((string) ($dest['country'] ?? '')),
            'st' => strtoupper((string) ($dest['state']   ?? '')),
            'pc' => $postcode,
            'q'  => (int)   ($summary['total_qty']     ?? 0),
            'w'  => (float) ($summary['total_weight']  ?? 0),
            's'  => (float) ($summary['subtotal']      ?? 0),
            'cs' => $summary['class_subtotal'] ?? array(),
            'cq' => $summary['class_qty']      ?? array(),
            'cw' => $summary['class_weight']   ?? array(),
            'v'  => (string) $version,
        );

        
        
        foreach (array('cs', 'cq', 'cw') as $k) {
            if (is_array($key_parts[$k])) {
                ksort($key_parts[$k]);
            }
        }
        return hash('sha256', wp_json_encode($key_parts));
    }

    
    public static function get($hash) {
        if (!is_string($hash) || $hash === '') { return null; }
        if (array_key_exists($hash, self::$request_cache)) {
            return self::$request_cache[$hash];
        }
        $cached = wp_cache_get('rates_' . $hash, 'aieo_trs');
        if (is_array($cached)) {
            self::$request_cache[$hash] = $cached;
            return $cached;
        }
        return null;
    }

    
    public static function set($hash, array $matched) {
        if (!is_string($hash) || $hash === '') { return; }
        self::$request_cache[$hash] = $matched;
        wp_cache_set('rates_' . $hash, $matched, 'aieo_trs', HOUR_IN_SECONDS);
    }

    
    public static function flush_request_cache() {
        self::$request_cache = array();
    }
}

}