package fsconfig

import (
	"log"
	"os"
	"path/filepath"
	"strconv"
	"strings"

	"github.com/nacos-group/nacos-sdk-go/v2/clients"
	"github.com/nacos-group/nacos-sdk-go/v2/common/constant"
	"github.com/nacos-group/nacos-sdk-go/v2/vo"
	"github.com/zeromicro/go-zero/core/conf"
	"gopkg.in/yaml.v2"
)

type EnvConfig struct {
	NacosServers []string `yaml:"nacos"`
	UserName     string   `yaml:"username"`
	Password     string   `yaml:"password"`
	NamespaceId  string   `yaml:"namespace"`
	DataId       string   `yaml:"dataid"`
	Group        string   `yaml:"group"`
	ProxyServer  struct {
		KeyFile string `yaml:"key"`
		PemFile string `yaml:"pem"`
	} `yaml:"proxyserver"`

	ServerBackend struct {
		KeyFile string `yaml:"key"`
		PemFile string `yaml:"pem"`
	} `yaml:"serverbackend"`
}

var optPathDirs = []string{"/opt", "./", "../", "../../"}

var nacosConfig *EnvConfig

func GetEnvCofing() *EnvConfig {

	if nacosConfig != nil {
		return nacosConfig
	}

	for _, optDir := range optPathDirs {
		if optDir[len(optDir)-1] != '/' {
			optDir = optDir + "/"
		}

		for _, yname := range []string{"env.yaml", "env.yml"} {
			f, err := os.Open(optDir + yname)
			if err != nil {
				// log.Println(err)
				continue
			}
			cfg := &EnvConfig{}
			err = yaml.NewDecoder(f).Decode(&cfg)
			if err != nil {
				// log.Println(err)
				continue
			}

			nacosConfig = cfg
			return nacosConfig
		}
	}

	panic("Can't find env.yaml or env.yml in the specified directories")

}

func init() {

}

func StartNacosConfig(configFile string, cfg any, OnChange func(namespace, group, dataId, data string)) {
	env := GetEnvCofing()

	// 创建serverConfig
	// 支持多个;至少一个ServerConfig
	var serverConfig []constant.ServerConfig

	for _, s := range env.NacosServers {

		sp := strings.Split(s, ":")
		host := sp[0]
		port, err := strconv.ParseUint(sp[1], 10, 64)
		if err != nil {
			panic(err)
		}

		serverConfig = append(serverConfig, constant.ServerConfig{
			IpAddr: host,
			Port:   port,
		})
	}

	// 创建clientConfig
	clientConfig := constant.ClientConfig{
		NamespaceId:         env.NamespaceId, // 如果需要支持多namespace，我们可以场景多个client,它们有不同的NamespaceId。当namespace是public时，此处填空字符串。
		TimeoutMs:           50000,
		NotLoadCacheAtStart: true,
		LogLevel:            "debug",
		LogDir:              "/tmp/nacos/log",
		CacheDir:            "/tmp/nacos/cache",
		Username:            env.UserName,
		Password:            env.Password,
	}

	// 创建服务发现客户端的另一种方式 (推荐)
	// namingClient, err := clients.NewNamingClient(
	// 	vo.NacosClientParam{
	// 		ClientConfig:  &clientConfig,
	// 		ServerConfigs: serverConfig,
	// 	},
	// )
	// if err != nil {
	// 	log.Fatalf("初始化nacos失败: %s", err.Error())
	// }

	// log.Println(namingClient)

	// 创建 Nacos 配置客户端
	configClient, err := clients.CreateConfigClient(map[string]interface{}{
		"clientConfig":  clientConfig,
		"serverConfigs": serverConfig,
	})
	if err != nil {
		log.Fatalf("Failed to create Nacos config client: %v", err)
	}

	cfgYamls := strings.Split(configFile, "/")
	cfgYaml := cfgYamls[len(cfgYamls)-1]
	yamlExt := filepath.Ext(cfgYaml)
	if !(yamlExt == ".yaml" || yamlExt == ".yml") {
		log.Panic(configFile)
	}

	// 获取配置
	content, err := configClient.GetConfig(vo.ConfigParam{
		DataId:   cfgYaml,
		Group:    env.Group,
		OnChange: OnChange,
	})
	if err != nil {
		log.Fatalf("Failed to get config from Nacos: %v", err)
	}

	var selfConfig map[string]interface{} = make(map[string]interface{})
	err = yaml.Unmarshal([]byte(content), &selfConfig)
	if err != nil {
		log.Fatalf("Failed to get config from Nacos: %v", err)
	}

	content, err = configClient.GetConfig(vo.ConfigParam{
		DataId:   "common",
		Group:    env.Group,
		OnChange: nil,
	})
	if err != nil {
		log.Fatalf("Failed to get config from Nacos: %v", err)
	}

	var commonConfig map[string]interface{} = make(map[string]interface{})
	err = yaml.Unmarshal([]byte(content), &commonConfig)
	if err != nil {
		log.Fatalf("Failed to get config from Nacos: %v", err)
	}

	for k, v := range commonConfig {
		selfConfig[k] = v
	}

	data, err := yaml.Marshal(selfConfig)
	if err != nil {
		log.Fatalf("Failed to get config from Nacos: %v", err)
	}

	log.Print("加载成功: ", cfgYaml, "\n环境: ", env.Group, "\n", string(data))
	err = conf.LoadFromYamlBytes(data, cfg)
	if err != nil {
		log.Fatalf("Failed to get config content from Nacos: %v", err)
	}
	// log.Println(content)
}