package nacos

import (
	"errors"
	"net"
	"os"
	"strconv"
	"strings"
	"sync"

	"github.com/nacos-group/nacos-sdk-go/v2/common/constant"
)

var (
	cc     *constant.ClientConfig
	sc     []constant.ServerConfig
	initMu sync.Once
)

func GetIP(domain string) string {
	if domain == "" {
		return ""
	}
	ips, err := net.LookupIP(domain)
	if err != nil || len(ips) == 0 {
		return ""
	}
	for _, ip := range ips {
		if ipv4 := ip.To4(); ipv4 != nil {
			return ipv4.String()
		}
	}
	return ips[0].String()
}

func InitNacosRegistryConfig() error {
	var initErr error
	initMu.Do(func() {
		hostsStr := os.Getenv("NACOS_HOSTS")
		portStr := os.Getenv("NACOS_PORT")
		if hostsStr == "" || portStr == "" {
			initErr = errors.New("NACOS_HOSTS 和 NACOS_PORT 必须配置")
			return
		}

		nacosPort, err := strconv.Atoi(portStr)
		if err != nil {
			initErr = errors.New("NACOS_PORT 格式错误")
			return
		}

		nacosHosts := strings.Split(hostsStr, ",")
		for _, host := range nacosHosts {
			host = strings.TrimSpace(host)
			if host == "" {
				continue
			}
			ip := GetIP(host)
			if ip == "" {
				ip = host
			}
			serverConfig := constant.NewServerConfig(ip, uint64(nacosPort))
			sc = append(sc, *serverConfig)
		}

		if len(sc) == 0 {
			initErr = errors.New("无有效的 Nacos 服务器地址")
			return
		}

		logDir := os.Getenv("LOG_SAVE_PATH")
		if logDir == "" {
			logDir = "/tmp/nacos/log"
		}

		cc = &constant.ClientConfig{
			NamespaceId:         os.Getenv("NACOS_NAMESPACE"),
			TimeoutMs:           5000,
			NotLoadCacheAtStart: true,
			LogDir:              logDir,
			LogLevel:            "warn",
			Username:            os.Getenv("NACOS_USER"),
			Password:            os.Getenv("NACOS_PASSWORD"),
		}
	})
	return initErr
}