package rocketmq

import (
	"context"
	"fmt"
	"time"

	"git.shuncheng.lu/bigthing/gocommon/pkg/internal/util"
	"git.shuncheng.lu/bigthing/gocommon/pkg/trace"
	"github.com/SkyAPM/go2sky"
	"github.com/SkyAPM/go2sky/propagation"
	"github.com/apache/rocketmq-client-go/v2/primitive"
)

/**
skywalking rocket-mq trace效果：
整体图：https://tyut.oss-accelerate.aliyuncs.com/image/2021/3-11/d1abf52d32e1476b9ca597d3bbc1d2a8.png

生产者图：https://tyut.oss-accelerate.aliyuncs.com/image/2021/3-11/dd1a106c07494b619d84c41b7aa5585a.png
消费者图：https://tyut.oss-accelerate.aliyuncs.com/image/2021/3-11/2378d0f6a726441097da2b578c9f607c.png
*/

const (
	rocketMQProducer = 38
	rocketMQConsumer = 39
)

const (
	peerName   = "No peer"
	language   = "Go"
	timeFormat = "2006-01-02 15:04:05"
)

// trace-config
var (
	newSkyWalkingProducerExitSpan = func(ctx context.Context, msg *primitive.Message) go2sky.Span {
		span, err := trace.GinNewExitSpan(ctx, "RocketMQ/Producer/"+msg.Topic, peerName, func(header string) error {
			msg.WithProperty(propagation.Header, header)
			return nil
		})
		if span == nil || err != nil {
			return nil
		}
		return span
	}
	newSkyWalkingConsumerEntrySpan = func(ctx context.Context, msg *primitive.MessageExt) (go2sky.Span, context.Context) {
		span, ctx, err := trace.GinNewEntrySpan(ctx, "RocketMQ/Consumer/"+msg.Topic, func() (s string, e error) {
			return msg.GetProperty(propagation.Header), nil
		})
		if span == nil || err != nil {
			return nil, ctx
		}
		return span, ctx
	}
)

func SetNewSkyWalkingConsumerEntrySpan(foo func(ctx context.Context, msg *primitive.MessageExt) (go2sky.Span, context.Context)) {
	newSkyWalkingConsumerEntrySpan = foo
}
func SetNewSkyWalkingProducerExitSpan(foo func(ctx context.Context, msg *primitive.Message) go2sky.Span) {
	newSkyWalkingProducerExitSpan = foo
}

func milliseconds2String(milliseconds int64) string {
	return time.Unix(milliseconds/1000, 0).Format(timeFormat)
}

func GetMessageTraceId(message *primitive.MessageExt) string {
	if message == nil {
		return ""
	}
	refSc := &propagation.SpanContext{}
	_ = refSc.DecodeSW8(message.GetProperty(propagation.Header))
	return refSc.TraceID
}

func getSkyWalkingConsumerTraceInterceptor() func(ctx context.Context, req, reply interface{}, next primitive.Invoker) error {
	return func(ctx context.Context, req, reply interface{}, next primitive.Invoker) error {
		var (
			spans []go2sky.Span = nil
		)
		messages, isOk := req.([]*primitive.MessageExt)
		if isOk && newSkyWalkingConsumerEntrySpan != nil {
			spans = make([]go2sky.Span, 0, len(messages))
			for index, _ := range messages {
				span, _ := newRocketMQConsumerSpan(ctx, messages[index])
				if span != nil {
					spans = append(spans, span)
				}
			}
		}
		if spans != nil {
			defer func() {
				for _, elem := range spans {
					if elem != nil {
						elem.End()
					}
				}
			}()
		}
		return next(ctx, req, reply)
	}
}

func newRocketMQConsumerSpan(ctx context.Context, message *primitive.MessageExt) (go2sky.Span, context.Context) {
	span, ctx := newSkyWalkingConsumerEntrySpan(ctx, message)
	if span == nil {
		return nil, ctx
	}
	span.SetComponent(rocketMQConsumer)
	span.Tag("mq.topic", message.Topic)
	span.Tag("mq.msg_id", message.MsgId)
	span.Tag("consumer.language", language)
	span.Tag("producer.time", milliseconds2String(message.StoreTimestamp))
	span.Tag("consumer.time", time.Now().Format(timeFormat))
	span.Tag("consumer.hostname", util.CurrentServerHostName())
	return span, ctx
}

func getSkyWalkingProducerTraceInterceptor() func(ctx context.Context, req, reply interface{}, next primitive.Invoker) error {
	return func(ctx context.Context, req, reply interface{}, next primitive.Invoker) error {
		var (
			span go2sky.Span
		)
		// 消息
		msg, isOk := req.(*primitive.Message)
		if isOk && newSkyWalkingProducerExitSpan != nil {
			span = newSkyWalkingProducerExitSpan(ctx, msg)
		}

		// end
		if span != nil {
			defer span.End()
		}

		// invoke
		if err := next(ctx, req, reply); err != nil {
			if span != nil {
				span.Error(time.Now(), fmt.Sprintf("%v", err))
			}
			return err
		}

		// handler result
		result, isOk := reply.(*primitive.SendResult)
		if isOk && span != nil {
			span.SetComponent(rocketMQProducer)
			span.Tag("mq.topic", msg.Topic)
			if tags := msg.GetTags(); tags != "" {
				span.Tag("mq.tags", tags)
			}
			span.Tag("mq.msg_id", result.MsgID)
			span.Tag("mq.broker.name", result.MessageQueue.BrokerName)
			span.Tag("mq.queue", util.ToString(result.MessageQueue.QueueId))
			span.Tag("mq.offset", util.ToString(result.QueueOffset))
			span.Tag("mq.status", util.ToString(result.Status))
			span.Tag("mq.trace", util.ToString(result.TraceOn))
			span.Tag("producer.language", language)
			span.Tag("producer.time", time.Now().Format(timeFormat))
			span.Tag("producer.hostname", util.CurrentServerHostName())
		}
		return nil
	}
}