package kafka

import (
	"context"
	"fmt"

	"git.loafle.net/commons/logging-go"
	occe "git.loafle.net/overflow/commons-go/config/external"
	"github.com/segmentio/kafka-go"
)

var (
	kafkaWriters map[string]*kafka.Writer
)

func InitPackage(config *occe.Kafka) {
	if nil == config {
		return
	}
	if nil == config.Producers || 0 == len(config.Producers) {
		return
	}

	kafkaWriters = make(map[string]*kafka.Writer)

	for n, c := range config.Producers {
		wc := kafka.WriterConfig{
			Brokers:           c.Brokers,
			Topic:             c.Topic,
			Balancer:          &kafka.LeastBytes{},
			MaxAttempts:       c.MaxAttempts,
			QueueCapacity:     c.QueueCapacity,
			BatchSize:         c.BatchSize,
			BatchTimeout:      c.BatchTimeout,
			ReadTimeout:       c.ReadTimeout,
			WriteTimeout:      c.WriteTimeout,
			RebalanceInterval: c.RebalanceInterval,
			RequiredAcks:      c.RequiredAcks,
			Async:             c.Async,
		}
		kafkaWriters[n] = kafka.NewWriter(wc)
	}
}

func StartPackage(config *occe.Kafka) {
	if nil == config {
		return
	}

}

func StopPackage(config *occe.Kafka) {
	if nil == config {
		return
	}

}

func DestroyPackage(config *occe.Kafka) {
	if nil == config {
		return
	}

	for _, w := range kafkaWriters {
		if err := w.Close(); nil != err {
			logging.Logger().Errorf("%v", err)
		}
	}
}

func Write(name string, key []byte, value []byte) error {
	if nil == kafkaWriters {
		return fmt.Errorf("Kafka client is not valid")
	}

	w, ok := kafkaWriters[name]
	if !ok {
		return fmt.Errorf("Kafka client is not valid")
	}

	err := w.WriteMessages(context.Background(),
		kafka.Message{
			Key:   key,
			Value: value,
		},
	)

	return err
}