package xserver

import (
	"context"
	"github.com/nsqio/go-nsq"
	"sync"
)

func NewConsumer(nsqHost string) *Consumer {
	return &Consumer{
		consumers: make([]*nsq.Consumer, 0),
		host:      nsqHost,
	}
}

type Consumer struct {
	consumers []*nsq.Consumer
	host      string
	wg        sync.WaitGroup
}

func (c *Consumer) Name() string {
	return "consumer"
}

func (s *Consumer) Start() error {
	for _, v := range s.consumers {
		if err := v.ConnectToNSQD(s.host); err != nil {
			return err
		}
	}
	return nil
}
func (s *Consumer) Shutdown(ctx context.Context) error {
	for _, v := range s.consumers {
		v.Stop()
	}
	s.wg.Wait()
	return nil
}

func (s *Consumer) Register(topic, channel string, fun func(msg *nsq.Message) error) error {
	consumer, err := nsq.NewConsumer(topic, channel, nsq.NewConfig())
	if err != nil {
		return err
	}
	consumer.AddHandler(nsq.HandlerFunc(func(msg *nsq.Message) error {
		s.wg.Add(1)
		defer s.wg.Done()
		return fun(msg)
	}))
	s.consumers = append(s.consumers, consumer)
	return nil
}