package mq

import (
	amqp "github.com/rabbitmq/amqp091-go"
)

// MQClient 是 RabbitMQ 的封装结构体
type MQClient struct {
	Conn    *amqp.Connection
	Channel *amqp.Channel
}

var MQ *MQClient // 全局复用实例

// InitMQ 初始化 RabbitMQ 连接和通道
func InitMQ(rabbitURL string) (*MQClient, error) {
	if rabbitURL == "" {
		rabbitURL = "amqp://guest:guest@localhost:5672/"
	}

	conn, err := amqp.Dial(rabbitURL)
	if err != nil {
		return nil, err
	}

	ch, err := conn.Channel()
	if err != nil {
		return nil, err
	}

	MQ = &MQClient{Conn: conn, Channel: ch}
	return MQ, nil
}

// Close 关闭连接和通道
func (c *MQClient) Close() {
	if c.Channel != nil {
		_ = c.Channel.Close()
	}
	if c.Conn != nil {
		_ = c.Conn.Close()
	}
}

// Publish 发布消息到指定队列
func (c *MQClient) Publish(queue string, body []byte) error {
	return c.Channel.Publish(
		"",    // exchange
		queue, // routing key
		false,
		false,
		amqp.Publishing{
			ContentType: "application/json",
			Body:        body,
		},
	)
}

// DeclareQueue 声明队列
func (c *MQClient) DeclareQueue(name string) (amqp.Queue, error) {
	return c.Channel.QueueDeclare(
		name,
		true,  // durable
		false, // auto-delete
		false, // exclusive
		false, // no-wait
		nil,   // arguments
	)
}

// Consume 注册消费者
func (c *MQClient) Consume(queue string) (<-chan amqp.Delivery, error) {
	return c.Channel.Consume(
		queue,
		"",    // consumer tag
		true,  // auto ack
		false, // exclusive
		false, // no local
		false, // no wait
		nil,   // args
	)
}