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// 订单相关mq
export enum ORDER {
    // 相关业务一个交换机
    EXCHANE = 'order.exchange',
    // 路由key
    ROUTERKEY_CREATE = 'order.create',
    ROUTERKEY_SUMMARY = 'order.#',
    // 两个队列
    QUEUE_NOTIFICATION = 'order.notification',
    QUEUE_SUMMARY = 'order.summary',
    // 死信
    ELX_EXCHANGE = 'order.dlx.exchange',
    ELK_QUEUE = 'order.dlq.queue'
}

import * as rabbimq from "./rabbitmq";
import { ORDER, EX_TYPE } from './rbEnum';
import * as mock from 'mockjs';

export async function create() {
    const connct = rabbimq.connection();
    const channel = await connct.createConfirmChannel();
    // @ts-ignore
    // 统一业务，用一个交换机： 延迟+topic
    await channel.assertExchange(ORDER.EXCHANE, EX_TYPE.DELAY, {
        durable: true,
        arguments: {'x-delayed-type': EX_TYPE.TOPIC }
    });
    // 模拟一些假的数据
    let i = 0;
    while(i < 3){
        i++;
        // N分钟后，对没支付的进行通知
        const time = mock.Random.integer(500, 2000);
        const expiration = 1000 * 60 * 60;
        const content = { id: mock.Random.integer(1000), number: mock.Random.integer(1, 3), time };
        const msg =  JSON.stringify(content);

        // !场景1：创建订单，如果三分钟不付款，则发短信通知
        channel.publish(ORDER.EXCHANE, ORDER.ROUTERKEY_CREATE, Buffer.from(msg), {
            expiration,
            contentType: 'application/json',
            headers: {
                'x-delay': time, // 一定要设置，否则按一般的交换机
            },
            // 消息持久化
            deliveryMode: 2
        }, (err, ok) => {
            // 生产端监听消息是否被ack；比如，记录日志啥的
            // 如果消费端，nack, 则不会再次到这里
            // console.log("是否被ack----ok: ", err, ok);
            if (err !== null) {
                console.warn('【SMS】Message nacked!');
            } else {
                console.log('【SMS】Message acked');
            }
        });
        // !场景2, 发送后，供消费端消费
        channel.publish(ORDER.EXCHANE, ORDER.QUEUE_SUMMARY, Buffer.from(msg), {}, (err, ok) => {
            if (err !== null) {
                console.warn('【summary】Message nacked!');
            } else {
                console.log('【summary】Message acked');
            }
        })

    }
    // 如果创建需要确认的channel，需要等待
    // 生产者消息确认，一旦消息被投递到指定交换机，broker就会ack
    await channel.waitForConfirms()
    await channel.close();
};

import * as rabbimq from "./rabbitmq";
import { Channel, Message } from "amqplib";
import { ORDER, EX_TYPE } from './rbEnum';
import * as mock from 'mockjs';


// 死信队列，针对无效信息的归属地
export async function orderDlq() {
    const connect = rabbimq.connection();
    const channel: Channel = await connect.createChannel();
    await channel.assertExchange(ORDER.ELX_EXCHANGE, EX_TYPE.TOPIC, { durable: true })
    const queueConsumer = await channel.assertQueue(ORDER.ELK_QUEUE, {
        exclusive: true,
    });
    await channel.prefetch(1, false);
    await channel.bindQueue(queueConsumer.queue, ORDER.ELX_EXCHANGE, 'order.#');

    channel.consume(queueConsumer.queue, async msg => {
        // console.info('【死信队列】收到的消息', msg.content.toString());
        channel.ack(msg, false);
    });
}

// 针对没有支付的，发送短信，
export async function orderSms() {
    const args = {
        exchange: ORDER.EXCHANE, exchangeType: EX_TYPE.DELAY,
        routerKey: ORDER.ROUTERKEY_CREATE, queueName: ORDER.QUEUE_NOTIFICATION,
        elx: ORDER.ELX_EXCHANGE, elk: ORDER.ELK_QUEUE
    };
    consumer(args, async (msg, channel) => {
        const { content } = msg;
        // console.log(`【短信】获取消息: ${content}`);
        // 根据消息ID，查询对应用户是否支付，如果支付ack, 否则发送短信&扔到死信队列，之后再说
        const success = mock.Random.boolean();
        if (success) {
            console.info(`【短信】无需发送短信 ${content}`, )
            channel.ack(msg, false);
        } else {
            // !可以扔到短信队列
            console.info(`【短信】该用户尚未支付，发送短信中----- ${content}`);
            channel.nack(msg, false, false);
        }
    })
}

// 创建订单，针对订单相关信息进行处理
export async function orderSummery() {
    const args = {
        exchange: ORDER.EXCHANE, exchangeType: EX_TYPE.DELAY,
        routerKey: ORDER.ROUTERKEY_SUMMARY, queueName: ORDER.QUEUE_SUMMARY,
        elx: ORDER.ELX_EXCHANGE, elk: ORDER.ELK_QUEUE
    };

    consumer(args, async (msg, channel) => {
        const { content, fields: { deliveryTag }, properties: { headers: { retry } } } = msg;
        // console.log(`【订单-消费】获取消息: ${content}`);
        // 模拟业务
        const success = await mock.Random.boolean();
        if (success) {
            console.info('【订单-消费】消费成功', content.toString());
            // broker 从内存磁盘中删除
            channel.ack(msg, false);
        } else {
            // 仍旧保留
            console.info(`【订单-消费】放入死信队列`);
            channel.nack(msg, false, false);
            // 最大重试次数 [加入redis 或 其他队列]
            //     if () {
            //         console.info(`【订单-消费】第 ${retry} 次消费 ${deliveryTag} 失败，尝试重试`);
            //         const requeue = true;
            //         channel.nack(msg, false, requeue);
            //     } else {
            //         console.info(`【订单-消费】第 ${retry} 次消费 ${deliveryTag} 失败，放入死信队列`);
            //         const requeue = false;
            //         channel.nack(msg, false, requeue);
            //     }
        }
    })
}


/**
 * 公用消费端
 * @param exchange 
 * @param exchangeType 
 * @param routerKey 
 * @param elx 死信交换机
 * @param elk 死信队列
 */
async function consumer(args: { exchange: string, exchangeType: any, routerKey: string, queueName: string, elx: string, elk: string },
    callback: (msg: Message, channel: Channel) => {}) {
    const { exchange, exchangeType, routerKey, queueName, elx, elk } = args;
    const connect = rabbimq.connection();
    const channel: Channel = await connect.createConfirmChannel();

    // ! topic + delay
    await channel.assertExchange(exchange, exchangeType, { durable: true, arguments: { 'x-delayed-type': EX_TYPE.TOPIC } })

    const queueConsumer = await channel.assertQueue(queueName, {
        exclusive: true,
        deadLetterExchange: elx,
        deadLetterRoutingKey: elk,
    });
    await channel.prefetch(1, false);
    await channel.bindQueue(queueConsumer.queue, exchange, routerKey);
    channel.consume(queueConsumer.queue, async msg => {
        // console.info('统一收到的消息', msg);
        callback(msg, channel);
    }, { noAck: false });
}