// Copyright 2019 getensh.com. All rights reserved.
// Use of this source code is governed by getensh.com.

package mq

import (
	"adm-ads/common.in/jsonrpc2"
	"encoding/json"
	"fmt"
	"log"

	//"github.com/go-kit/kit/transport/amqp"
	//"github.com/go-kit/kit/transport/amqp"
	"github.com/streadway/amqp"
	"os"
	"time"
)

type RabbitmqClient struct {
	Addr string
	Username string
	Passwrod string
	Vhost string
	ExchangeName string
	QueueName string
	RouteBindKey string
	Connection *amqp.Connection
	PubChannel *amqp.Channel
	CallFunc func([]byte)error
	IsPub bool
	ConsumerChannelCount int
}

var AdsMq *RabbitmqClient

func SetAdsMq(client *RabbitmqClient){
	AdsMq = client
}


func InitRabbitmq(addr, username, passwrod, vhost, exchangeName, queueName, routeBindKey string,callFunc func([]byte)error,isPub bool,consumerChannelCount int) *RabbitmqClient {
	// 创建连接
	rabbitmqClient := &RabbitmqClient{Addr: addr,
		Username: username, Passwrod: passwrod,
		Vhost: vhost, ExchangeName: exchangeName,
		RouteBindKey: routeBindKey, QueueName: queueName,
		CallFunc:callFunc,IsPub:isPub,
		ConsumerChannelCount:consumerChannelCount}
	var err error
	rabbitmqClient.Connection ,err = rabbitmqClient.Connect()
	if err != nil{
		fmt.Println("dial err :", err)
		os.Exit(1)
	}

	// 启动发送channel
	if isPub{
		err = rabbitmqClient.InitPubChannel()
		if err != nil {
			os.Exit(2)
		}
	}


	return rabbitmqClient
}

func (r *RabbitmqClient) StartConsumer(){
	// 启动消费channel
	if r.CallFunc!= nil{
		for i:=0;i<r.ConsumerChannelCount;i++{
			err := r.InitConsumerChannel(i)
			if err != nil{
				os.Exit(3)
			}
		}
	}
}


func (r *RabbitmqClient) Connect() (*amqp.Connection,error) {
	// 创建连接
	connectAddr := fmt.Sprintf("amqp://%s:%s@%s/%s", r.Username, r.Passwrod, r.Addr, r.Vhost)
	connect, err := amqp.Dial(connectAddr)
	if err != nil {
		return nil,err
	}

	go func() {
		log.Printf("Closing: %s", <-connect.NotifyClose(make(chan *amqp.Error)))
		log.Printf("Trying to reconnect")
		for {
			err := r.Reconnect()
			if err != nil {
				log.Println("reconnect:", err)
				time.Sleep(3 * time.Second)
			} else {
				break
			}
		}
	}()

	return connect,nil
}

func (r *RabbitmqClient) InitPubChannel() error {
	// 获取通道
	var err error
	r.PubChannel, err = r.Connection.Channel()
	if err != nil {
		return err
	}
	// 创建交换机
	err = r.PubChannel.ExchangeDeclare(r.ExchangeName, "topic", true, false, false, true, nil)
	if err != nil {
		return err
	}

	// 创建队列
	_, err = r.PubChannel.QueueDeclare(r.QueueName, true, false, false, true, nil)
	if err != nil {
		return err
	}
	//  绑定交换机和队列
	err = r.PubChannel.QueueBind(r.QueueName, r.RouteBindKey, r.ExchangeName, true, nil)
	if err != nil {
		return err
	}

	return nil
}



func (r *RabbitmqClient) InitConsumerChannel(index int) error {
	// 获取通道
	channel, err := r.Connection.Channel()
	if err != nil {
		return err
	}
	// 创建交换机
	err = channel.ExchangeDeclare(r.ExchangeName, "topic", true, false, false, true, nil)
	if err != nil {
		return err
	}

	// 创建队列
	_, err = channel.QueueDeclare(r.QueueName, true, false, false, true, nil)
	if err != nil {
		return err
	}
	//  绑定交换机和队列
	err =channel.QueueBind(r.QueueName, r.RouteBindKey, r.ExchangeName, true, nil)
	if err != nil {
		return err
	}

	channel.Qos(1,0,false)

	go ConsumeMsg(r.CallFunc,index,r.QueueName,channel)

	return nil
}


func ConsumeMsg(callFunc func([]byte) error,index int,queueName string,channel *amqp.Channel) {

	defer func() {
		if r := recover(); r != nil {
			err := fmt.Errorf("%+v", r)
			e := &jsonrpc2.Error{}
			if er := json.Unmarshal([]byte(err.Error()), e); er != nil {
				fmt.Println("panic:", err.Error())
			}
		}
	}()

	name := fmt.Sprintf("consumer%d",index)
	deliveries, err := channel.Consume(queueName, name, false, false, false, true, nil)
	if err != nil {
		fmt.Println("consume fail")
		return
	}

	//defer channel.Close()
	closeChan := make(chan *amqp.Error, 1)
	notifyClose := channel.NotifyClose(closeChan)

	for {
		select {
		case e := <-notifyClose:
			fmt.Printf("chan通道错误,e:%s", e.Error())
			close(closeChan)
			return
		case delivery := <-deliveries:
			// 手动ack确认
			// 注意： 这里只要调用了ack就是手动确认模式，
			// multiple 表示的是在此channel中先前所有未确认的deliveries都将被确认
			// 并不是表示设置为false就不进行当前ack确认,multiple=true： 用于设置批量消息确认；
			// 假设：在Channel（ch）上有5,6,7,8这4个delivery(ack) tags未确认；
			//情况1，delivery_tag=8 & multiple=true： 则5,6,7,8这4个tags都将被确认；
			//情况2，delivery_tag=8 & multiple=false：则只有8被确认，而5,6,7将不会被被确认；
			// 不做ack的话，在该消费者连接中断后，会重新投递给其他消费者
			err := callFunc(delivery.Body)
			if err != nil {
				fmt.Println("callFunc:",err.Error())
			}else{
				if err := delivery.Ack(false); err != nil {
					fmt.Println(err.Error())
				}
			}
		}
		/*v, ok := <-deliveries
		if ok {
			// 手动ack确认
			// 注意： 这里只要调用了ack就是手动确认模式，
			// multiple 表示的是在此channel中先前所有未确认的deliveries都将被确认
			// 并不是表示设置为false就不进行当前ack确认,multiple=true： 用于设置批量消息确认；
			// 假设：在Channel（ch）上有5,6,7,8这4个delivery(ack) tags未确认；
			//情况1，delivery_tag=8 & multiple=true： 则5,6,7,8这4个tags都将被确认；
			//情况2，delivery_tag=8 & multiple=false：则只有8被确认，而5,6,7将不会被被确认；
			// 不做ack的话，在该消费者连接中断后，会重新投递给其他消费者
			err := callFunc(v.Body)
			if err != nil {
				fmt.Println("callFunc:",err.Error())
			}else{
				if err := v.Ack(false); err != nil {
					fmt.Println(err.Error())
				}
			}
		} else {
			fmt.Println("Channel close")
			return
		}*/
	}

}

func (r *RabbitmqClient) Reconnect() error {
	// 创建连接
	var err error
	r.Connection ,err = r.Connect()
	if err != nil{
		fmt.Println("dial err :", err)
		return err
	}


	// 启动发送channel
	if r.IsPub{
		err = r.InitPubChannel()
		if err != nil {
			return err
		}
	}


	// 启动消费channel
	if r.CallFunc!= nil{
		for i:=0;i<r.ConsumerChannelCount;i++{
			err = r.InitConsumerChannel(i)
			if err != nil{
				return err
			}
		}
	}
	return nil
}

func (r *RabbitmqClient) PublishMsg(data []byte) (err error) {
	defer func() {
		if r := recover(); r != nil {
			err = fmt.Errorf("%+v", r)
			e := &jsonrpc2.Error{}
			if er := json.Unmarshal([]byte(err.Error()), e); er != nil {
				fmt.Println("panic:", err.Error())
			}
		}
	}()

	err = r.PubChannel.Publish(r.ExchangeName, r.RouteBindKey, true, false, amqp.Publishing{
		DeliveryMode: amqp.Persistent, // 消息持久化
		Timestamp:    time.Now(),
		ContentType:  "text/plain",
		Body:         data,
	})

	if err != nil {
		fmt.Println("publish msg err:", err)
	} else {
		fmt.Println("publish success!!!!")
	}

	return err
}