package kafka

import (
	"context"
	"git.noahlan.cn/noahlan/ntool/ndef"
	"github.com/Shopify/sarama"
)

type ConsumerGroup struct {
	sarama.ConsumerGroup
	groupId     string
	topics      []string
	unMarshaler ndef.Unmarshaler
}

type ConsumerGroupConfig struct {
	KafkaVersion   sarama.KafkaVersion
	OffsetsInitial int64
	IsReturnErr    bool
	UnMarshaler    ndef.Unmarshaler
}

func NewConsumerGroup(config *ConsumerGroupConfig, addr, topics []string, groupId string) (*ConsumerGroup, error) {
	c := sarama.NewConfig()
	c.Version = config.KafkaVersion
	c.Consumer.Offsets.Initial = config.OffsetsInitial
	c.Consumer.Return.Errors = config.IsReturnErr

	client, err := sarama.NewClient(addr, c)
	if err != nil {
		return nil, err
	}

	consumerGroup, err := sarama.NewConsumerGroupFromClient(groupId, client)
	if err != nil {
		return nil, err
	}
	return &ConsumerGroup{
		ConsumerGroup: consumerGroup,
		groupId:       groupId,
		topics:        topics,
		unMarshaler:   config.UnMarshaler,
	}, nil
}

func (cg *ConsumerGroup) RegisterHandlerAndConsumer(handler sarama.ConsumerGroupHandler) {
	ctx := context.Background()
	for {
		err := cg.ConsumerGroup.Consume(ctx, cg.topics, handler)
		if err != nil {
		}
	}
}