package mq

import (
	"context"
	"encoding/json"
	"fmt"
	"github.com/Shopify/sarama"
	"github.com/qit-team/snow-core/redis"
	"qteam/app/utils"
	"qteam/config"

	"strconv"
	"sync"
)

type KafkaMq struct {
}

// 同步
func (n KafkaMq) Produce(name string, log interface{}, delayTime int, args ...interface{}) error {
	kafConfig := sarama.NewConfig()
	kafConfig.Producer.RequiredAcks = sarama.WaitForAll          // 发送完数据需要leader和follow都确认
	kafConfig.Producer.Partitioner = sarama.NewRandomPartitioner // 新选出一个partition
	kafConfig.Producer.Return.Successes = true                   // 成功交付的消息将在success channel返回

	// 构造一个消息
	msg := &sarama.ProducerMessage{}
	msg.Topic = name
	var data, _ = json.Marshal(log)
	msg.Value = sarama.StringEncoder(string(data))
	// 连接kafka
	client, err := sarama.NewSyncProducer(config.GetConf().KafkaUrl, kafConfig)
	if err != nil {
		fmt.Println("producer closed, err:", err)
		return nil
	}
	defer client.Close()
	// 发送消息
	pid, offset, err := client.SendMessage(msg)
	if err != nil {
		utils.Log(nil, "send msg failed, err:", err, pid, offset)
		return nil
	}
	return nil
}

func (n KafkaMq) Consume(name string, hand interface{}) {
	consumer, err := sarama.NewConsumer(config.GetConf().KafkaUrl, nil)
	if err != nil {
		utils.Log(nil, "kafka comsume", err.Error())
		return
	}
	partitionList, err := consumer.Partitions(name) // 根据topic取到所有的分区
	if err != nil {
		utils.Log(nil, "kafka comsume", err.Error())
		return
	}
	//utils.Log(nil,"kafka comsume",name,partitionList)
	for partition := range partitionList { // 遍历所有的分区
		// 针对每个分区创建一个对应的分区消费者
		var offsetReDis, _ = redis.GetRedis().Incr(context.Background(), "kafka_consume:"+strconv.Itoa(int(partition))).Result() //保证多消费者不重复消费
		var offset int64 = sarama.OffsetNewest
		if offsetReDis > 0 {
			//offset = int64(offsetReDis)
		}
		pc, err := consumer.ConsumePartition(name, int32(partition), offset)
		//utils.Log(nil,"partion",int32(partition))
		if err != nil {
			fmt.Printf("failed to start consumer for partition %d,err:%v\n", partition, err)
			return
		}
		defer pc.AsyncClose()
		var wg sync.WaitGroup
		wg.Add(1)
		// 异步从每个分区消费信息
		go func(sarama.PartitionConsumer) {
			for msg := range pc.Messages() {
				defer wg.Done()
				var handler = hand.(func(tag uint64, ch interface{}, msg []byte))
				handler(0, nil, msg.Value)
				//utils.Log(nil,"hand msg",string(msg.Value),msg.Offset)
			}
		}(pc)
		wg.Wait()
	}
}
func (n KafkaMq) DelyConsume(name string, hand interface{}) {

}