package com.bwie.auth.utils;

import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.DirectExchange;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.rabbit.core.RabbitAdmin;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.HashMap;
import java.util.Map;

@Component
public class DLXQueue {
    // routingKey
    private static final String DEAD_ROUTING_KEY = "dead.routingkey";
    private static final String ROUTING_KEY = "routingkey";
    private static final String DEAD_EXCHANGE = "dead.exchange";
    private static final String EXCHANGE = "common.exchange";
    @Autowired
    RabbitTemplate rabbitTemplate;
    @Resource
    RabbitAdmin rabbitAdmin;

    /**
     * 发送死信队列，过期后进入死信交换机，进入死信队列
     *
     * @param queueName     队列名称
     * @param deadQueueName 死信队列名称
     * @param params        消息内容
     * @param expiration    过期时间 毫秒
     */
    public void sendDLXQueue(String queueName, String deadQueueName, Object params, Integer expiration) {
        /**
         * ----------------------------------先创建一个ttl队列和死信队列--------------------------------------------
         */
        Map<String, Object> map = new HashMap<>();
        // 队列设置存活时间，单位ms, 必须是整形数据。
        map.put("x-message-ttl", expiration);
        // 设置死信交换机
        map.put("x-dead-letter-exchange", DEAD_EXCHANGE);
        // 设置死信交换器路由
        map.put("x-dead-letter-routing-key", DEAD_ROUTING_KEY);
        /*参数1：队列名称  参数2：持久化  参数3：是否排他 参数4：自动删除队列  参数5：队列参数*/
        Queue queue = new Queue(queueName, true, false, false, map);
        rabbitAdmin.declareQueue(queue);
        /**
         * ---------------------------------创建交换机---------------------------------------------
         */
        DirectExchange directExchange = new DirectExchange(EXCHANGE, true, false);
        rabbitAdmin.declareExchange(directExchange);
        /**
         * ---------------------------------队列绑定交换机---------------------------------------------
         */
        Binding binding = BindingBuilder.bind(queue).to(directExchange).with(ROUTING_KEY);
        rabbitAdmin.declareBinding(binding);
        /**
         * ---------------------------------在创建一个死信交换机和队列，接收死信队列---------------------------------------------
         */
        DirectExchange deadExchange = new DirectExchange(DEAD_EXCHANGE, true, false);
        rabbitAdmin.declareExchange(deadExchange);

        Queue deadQueue = new Queue(deadQueueName, true, false, false);
        rabbitAdmin.declareQueue(deadQueue);
        /**
         * ---------------------------------队列绑定死信交换机---------------------------------------------
         */
        // 将队列和交换机绑定
        Binding deadbinding = BindingBuilder.bind(deadQueue).to(deadExchange).with(DEAD_ROUTING_KEY);
        rabbitAdmin.declareBinding(deadbinding);
        // 发送消息
        rabbitTemplate.convertAndSend(EXCHANGE, ROUTING_KEY, params);
    }
}