// cache.go
package cache

import (
	"context"
	"encoding/json"
	"time"

	"github.com/go-redis/redis/v8"
)

var redisClient *redis.Client

func NewRedisClient() *redis.Client {
	if redisClient == nil {
		redisClient = redis.NewClient(&redis.Options{
			Addr:     "localhost:6379",
			Password: "", // 无密码
			DB:       0,  // 默认数据库
		})

		// 测试连接
		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()

		_, err := redisClient.Ping(ctx).Result()
		if err != nil {
			panic("Redis连接失败: " + err.Error())
		}
	}

	return redisClient
}

// SetSecondCacheObject 设置二级缓存
func SetSecondCacheObject(ctx context.Context, key string, value interface{}, expiration time.Duration) error {
	client := NewRedisClient()

	jsonData, err := json.Marshal(value)
	if err != nil {
		return err
	}

	return client.Set(ctx, key, jsonData, expiration).Err()
}

// GetSecondCacheObject 获取二级缓存
func GetSecondCacheObject(ctx context.Context, key string, result interface{}) error {
	client := NewRedisClient()

	data, err := client.Get(ctx, key).Result()
	if err != nil {
		return err
	}

	return json.Unmarshal([]byte(data), result)
}