package rocketmq

import (
	"context"
	"errors"

	"github.com/apache/rocketmq-client-go/v2"
	"github.com/apache/rocketmq-client-go/v2/primitive"
	"github.com/apache/rocketmq-client-go/v2/producer"
)

type Producer interface {
	// 定制化生产者使用(对于事务消息，目前Go的Sdk不成熟)
	GetRocketMQProducer() rocketmq.Producer
	// 发送消息
	Send(ctx context.Context, topic string, message []byte) error
	SendV2(ctx context.Context, topic string, message []byte) (*primitive.SendResult, error)
	// 发送消息(由于批量消息有特殊的加工，所以目前API不直接提供批量消息的封装，原因如下:)
	// 1、发送批量消息是拿不到message-id的
	// 2、发送批量消息interceptor 的req会是一个Batch的message，具体可以看 github.com/apache/rocketmq-client-go/v2@v2.0.0/producer/producer.go:114
	SendMessage(ctx context.Context, message *primitive.Message) error
	// 获取消息结果（结果可以获取偏移量）
	SendMessageV2(ctx context.Context, message *primitive.Message) (*primitive.SendResult, error)
	// 发送消息携带tag
	SendWithTag(ctx context.Context, topic string, message []byte, tag string) (*primitive.SendResult, error)
}

type rocketMqProducer struct {
	producer rocketmq.Producer
}

// 顺便启动
func newProducer(configs ...producer.Option) (*rocketMqProducer, error) {
	pro, err := rocketmq.NewProducer(configs...)
	if err != nil {
		return nil, err
	}
	infoc(context.Background(), "[RocketMq-Producer] init success, config: %#v", pro)

	// start
	if err := pro.Start(); err != nil {
		errorc(context.Background(), "[RocketMq-Producer] init err, err: %v", err)
		return nil, err
	}
	infoc(context.Background(), "[RocketMq-Producer] start success !")
	return &rocketMqProducer{producer: pro}, nil
}

// 获取producer
func (p *rocketMqProducer) GetRocketMQProducer() rocketmq.Producer {
	return p.producer
}

// @after
// 发送消息 (只允许启动后发送)
func (p *rocketMqProducer) SendMessage(ctx context.Context, message *primitive.Message) error {
	if _, err := p.SendMessageResult(ctx, message); err != nil {
		return err
	}
	return nil
}

// @after
// 发送消息 (只允许启动后发送)
func (p *rocketMqProducer) Send(ctx context.Context, topic string, message []byte) error {
	return p.SendMessage(ctx, primitive.NewMessage(topic, message))
}

// @after
// 发送消息+结果 (只允许启动后发送)
func (p *rocketMqProducer) SendV2(ctx context.Context, topic string, message []byte) (*primitive.SendResult, error) {
	return p.SendMessageResult(ctx, primitive.NewMessage(topic, message))
}

// @after
// 发送消息+结果 (只允许启动后发送)
func (p *rocketMqProducer) SendWithTag(ctx context.Context, topic string, message []byte, tag string) (*primitive.SendResult, error) {
	msg := primitive.NewMessage(topic, message)
	msg = msg.WithTag(tag)
	return p.SendMessageResult(ctx, msg)
}

// @after
// 发送消息+结果 (只允许启动后发送)
func (p *rocketMqProducer) SendMessageV2(ctx context.Context, message *primitive.Message) (*primitive.SendResult, error) {
	return p.SendMessageResult(ctx, message)
}

// @after
// 发送消息+结果 (只允许启动后发送)
func (p *rocketMqProducer) SendMessageResult(ctx context.Context, message *primitive.Message) (*primitive.SendResult, error) {
	if message == nil {
		return nil, errors.New("the rocket mq sent message is nil")
	}
	infoc(ctx, "[RocketMq-Producer] sync send msg, message: %s", message)
	result, err := p.producer.SendSync(ctx, message)
	if err != nil {
		errorc(ctx, "[RocketMq-Producer] sync send err, err: %v", err)
		return nil, err
	}
	infoc(ctx, "[RocketMq-Producer] sync send msg success, queue: %d, offset: %d, msg_id: %s", result.MessageQueue.QueueId, result.QueueOffset, result.MsgID)
	return result, nil
}