package apollo

import (
	"fmt"

	"gitea.bvbej.com/bvbej/base-golang/pkg/env"
	"github.com/apolloconfig/agollo/v4"
	"github.com/apolloconfig/agollo/v4/component/log"
	apolloConfig "github.com/apolloconfig/agollo/v4/env/config"
	"github.com/apolloconfig/agollo/v4/storage"
	"github.com/spf13/viper"
)

type clientConfig struct {
	client agollo.Client
	ac     *apolloConfig.AppConfig
	conf   any

	onChange       func(event *storage.ChangeEvent)
	onNewestChange func(*storage.FullChangeEvent)
}

type Option func(*clientConfig)

func WithOnChangeEvent(event func(event *storage.ChangeEvent)) Option {
	return func(conf *clientConfig) {
		conf.onChange = event
	}
}

func WithOnNewestChangeEvent(event func(event *storage.FullChangeEvent)) Option {
	return func(conf *clientConfig) {
		conf.onNewestChange = event
	}
}

func GetApolloConfig(appId, secret string, config any, opt ...Option) error {
	var err error
	namespace := env.Active().Value() + ".yaml"

	c := new(clientConfig)
	c.conf = config
	c.ac = &apolloConfig.AppConfig{
		AppID:          appId,
		Cluster:        "dev",
		IP:             "https://config.bvbej.com",
		NamespaceName:  namespace,
		IsBackupConfig: false,
		Secret:         secret,
		MustStart:      true,
	}
	for _, option := range opt {
		option(c)
	}

	agollo.SetLogger(&log.DefaultLogger{})

	c.client, err = agollo.StartWithConfig(func() (*apolloConfig.AppConfig, error) {
		return c.ac, nil
	})
	if err != nil {
		return fmt.Errorf("get config error:[%s]", err)
	}
	c.client.AddChangeListener(c)

	err = c.serialization()
	if err != nil {
		return fmt.Errorf("unmarshal config error:[%s]", err)
	}

	return nil
}

func (c *clientConfig) serialization() error {
	parser := viper.New()

	parser.SetConfigType("yaml")
	c.client.GetConfigCache(c.ac.NamespaceName).Range(func(key, value any) bool {
		parser.Set(key.(string), value)
		return true
	})

	return parser.Unmarshal(c.conf)
}

func (c *clientConfig) OnChange(event *storage.ChangeEvent) {
	_ = c.serialization()
	if c.onChange != nil {
		c.onChange(event)
	}
}

func (c *clientConfig) OnNewestChange(event *storage.FullChangeEvent) {
	if c.onNewestChange != nil {
		c.onNewestChange(event)
	}
}