<?php

namespace App\Utils;

use Hyperf\Redis\RedisFactory;
use Hyperf\Redis\RedisProxy;
use function Hyperf\Support\make;

class RedisInfoHelper
{
    protected static RedisProxy|null $redis = null;

    /**
     * 初始化 Redis 实例
     */
    protected static function getRedis(): RedisProxy|null
    {
        if (!self::$redis) {
            $factory = make(RedisFactory::class);
            // 默认使用 default pool
            self::$redis = $factory->get('default');
        }
        return self::$redis;
    }

    /**
     * 获取 Redis 运行信息
     */
    public static function getInfo(): array
    {
        $redis = self::getRedis();
        $info = $redis->info(); // 返回数组形式

        // 解析需要的字段
        $used_memory = isset($info['used_memory']) ? self::formatBytes($info['used_memory']) : '0 B';
        $used_cpu = isset($info['used_cpu_sys']) && isset($info['used_cpu_user'])
            ? round($info['used_cpu_sys'] + $info['used_cpu_user'], 2)
            : 0;

        return [
            'version'          => $info['redis_version'] ?? 'unknown',
            'mode'             => $info['redis_mode'] ?? 'unknown',
            'port'             => $info['tcp_port'] ?? 0,
            'clients'          => $info['connected_clients'] ?? 0,
            'uptime_days'      => $info['uptime_in_days'] ?? 0,
            'used_memory'      => $used_memory,
            'used_cpu'         => $used_cpu . " 秒",
            'maxmemory'        => isset($info['maxmemory']) ? self::formatBytes($info['maxmemory']) : 'unlimited',
            'aof_enabled'      => isset($info['aof_enabled']) && $info['aof_enabled'] == 1,
            'rdb_last_bgsave_status' => $info['rdb_last_bgsave_status'] ?? 'unknown',
            'keys'             => $info['db0'] ?? '0',
            'net_input_bytes'  => isset($info['total_net_input_bytes']) ? self::formatBytes($info['total_net_input_bytes']) : '0 B',
            'net_output_bytes' => isset($info['total_net_output_bytes']) ? self::formatBytes($info['total_net_output_bytes']) : '0 B',
        ];
    }

    /**
     * 格式化字节为易读形式
     */
    protected static function formatBytes(int $bytes): string
    {
        if ($bytes <= 0) {
            return '0 B';
        }

        $units = ['B', 'KB', 'MB', 'GB', 'TB'];
        $i = (int) floor(log($bytes, 1024));
        return sprintf('%.2f %s', $bytes / pow(1024, $i), $units[$i]);
    }
}