package ra

import (
	"context"
	"encoding/json"
	"errors"
	rabbitmq "github.com/wagslane/go-rabbitmq"
	"log"
)

type Message struct {
	ID     string `json:"id"`
	Method string `json:"method"`
	Body   []byte `json:"body"`
}

var FuncMap = make(map[string]func(message *Message))

var MQUrl = "amqp://lxz:lxz664278@106.54.33.152:5672/lxz"
var ExchangeName = "Agent_exchange"
var QueueName = "Agent_queue"
var RoutingKey = "192.168.2.122"

var ResultExchangeName = "Server_exchange"

func InitMQ() {

	conn, err := rabbitmq.NewConn(
		MQUrl,
		rabbitmq.WithConnectionOptionsLogging,
	)
	if err != nil {
		panic(err)
	}

	consumer, err := rabbitmq.NewConsumer(
		conn,
		QueueName,
		rabbitmq.WithConsumerOptionsRoutingKey(RoutingKey),
		rabbitmq.WithConsumerOptionsExchangeDeclare,
		rabbitmq.WithConsumerOptionsExchangeName(ExchangeName),
		rabbitmq.WithConsumerOptionsExchangeKind("direct"),
	)
	if err != nil {
		InitMQ()
		return
	}

	err = consumer.Run(func(d rabbitmq.Delivery) (action rabbitmq.Action) {
		// 处理消息
		message, err := processMessage(d.Body)
		if err != nil {
			return
		}
		log.Println("消息：", message)
		//调用函数
		if _, ok := FuncMap[message.Method]; !ok {
			return
		}
		FuncMap[message.Method](message)
		return rabbitmq.Ack
	})
	if err != nil {
		log.Println("消费消息错误：", err)
		InitMQ()
	}
	return
}

func processMessage(msg []byte) (*Message, error) {
	var message Message
	err := json.Unmarshal(msg, &message)
	if err != nil {
		log.Printf("反序列化消息错误：%s\n", err)
		return nil, err
	}
	return &message, nil
}

func newPublisher(conn *rabbitmq.Conn) (*rabbitmq.Publisher, error) {
	pub, err := rabbitmq.NewPublisher(
		conn,
	)
	if err != nil {
		return nil, err
	}

	pub.NotifyReturn(func(r rabbitmq.Return) {
		log.Printf("message returned from server: %s", string(r.Body))
	})

	pub.NotifyPublish(func(c rabbitmq.Confirmation) {
		log.Printf("message confirmed from server. tag: %v, ack: %v", c.DeliveryTag, c.Ack)
	})
	return pub, nil
}

func SendMessage(message Message, key string) error {

	conn, err := rabbitmq.NewConn(
		MQUrl,
		rabbitmq.WithConnectionOptionsLogging,
	)
	defer conn.Close()

	pub, err := newPublisher(conn)
	if err != nil {
		return err
	}
	marshal, err := json.Marshal(message)
	if err != nil {
		log.Printf("序列化消息错误: %s\n", err)
		return err
	}
	confirms, err := pub.PublishWithDeferredConfirmWithContext(
		context.Background(),
		marshal,
		[]string{key},
		rabbitmq.WithPublishOptionsContentType("application/json"),
		rabbitmq.WithPublishOptionsPriority(0),
		rabbitmq.WithPublishOptionsExpiration("60000"),
		rabbitmq.WithPublishOptionsExchange(ResultExchangeName),
	)
	if err != nil {
		return err
	}
	if len(confirms) == 0 || confirms[0] == nil {
		log.Println("no confirms received")
		return errors.New("no confirmations received")
	}

	ok, err := confirms[0].WaitContext(context.Background())
	if err != nil {
		return err
	}
	if !ok {
		log.Println("message was nack'd")
		return errors.New("message was nack'd")
	}
	return nil
}