package rabbitmq

import (
	"fmt"
	"os"
	"sync"

	"github.com/gogf/gf/v2/util/guid"
)

var (
	instanceId   string
	instanceOnce sync.Once
)

// getInstanceId 获取当前实例的唯一标识（单例）
// 格式：{hostname}.{uuid8}
func getInstanceId() string {
	instanceOnce.Do(func() {
		// 获取主机名
		hostname, err := os.Hostname()
		if err != nil || hostname == "" {
			hostname = "unknown"
		}

		// 生成8位UUID
		uuid := guid.S()[:8]

		instanceId = fmt.Sprintf("%s.%s", hostname, uuid)
	})
	return instanceId
}

// GetInstanceQueueName 获取当前实例的响应队列名
// 格式：{baseQueue}.{hostname}.{uuid8}
func GetInstanceQueueName(baseQueue string) string {
	if baseQueue == "" {
		baseQueue = "ragflow.response"
	}
	return fmt.Sprintf("%s.%s", baseQueue, getInstanceId())
}