package nats

import (
	"git.aionnect.com/aionnect/go-common/utils/logger"
	"git.aionnect.com/aionnect/go-common/utils/mq"
	"github.com/nats-io/nats.go"
	"github.com/spf13/viper"
	"time"
)

// 生产者对象
type Producer struct {
	conn *nats.EncodedConn
	log  *logger.Logger
}

// 新建生产者
func NewProducer() *Producer {
	viper.SetDefault("nats.servers", "nats://127.0.0.1:4222")
	servers := viper.GetString("nats.servers")

	var producer *Producer
	nc, err := nats.Connect(servers, nats.MaxReconnects(5), nats.ReconnectWait(2*time.Second),
		nats.DisconnectHandler(func(nc *nats.Conn) {
			producer.GetLogger().Info("Got disconnected!\n")
		}),
		nats.ReconnectHandler(func(nc *nats.Conn) {
			producer.GetLogger().Infof("Got reconnected to %v!\n", nc.ConnectedUrl())
		}),
		nats.ClosedHandler(func(nc *nats.Conn) {
			producer.GetLogger().Infof("Connection closed. Reason: %q\n", nc.LastError())
		}),
	)
	if nil != err {
		panic(err)
	}
	c, err := nats.NewEncodedConn(nc, nats.JSON_ENCODER)
	producer = &Producer{conn: c}
	return producer
}

// 指定日志记录器
func (p *Producer) SetLogger(log *logger.Logger) {
	if nil == log {
		return
	}
	p.log = log
}

// 获取当前日志记录器
func (p *Producer) GetLogger() *logger.Logger {
	if nil == p.log {
		p.log = logger.New()
	}
	return p.log
}

// 发送单条消息
func (p *Producer) SendJSON(topic string, value interface{}) (result interface{}, err error) {
	if topic == "" {
		return "", nil
	}

	err = p.conn.Publish(topic, value)
	if nil != err {
		return "", err
	}
	return "success", nil
}

// 批量发送消息
func (p *Producer) SendJSONs(messages []*mq.ProducerMessage) (err error) {
	if nil == messages || len(messages) == 0 {
		return
	}
	for i := 0; i < len(messages); i++ {
		if messages[i].Topic == "" {
			continue
		}

		_ = p.conn.Publish(messages[i].Topic, messages[i].Value)
	}
	return
}

// 关闭
func (p *Producer) Close() error {
	p.conn.Close()
	return nil
}