import asyncio
import aio_pika

from config import RABBITMQ_URI


async def setup_fanout_exchange(exchange_name="demo.fanout", queue_name_prefix="demo.fanout.queue-"):
    # 建立连接
    connection = await aio_pika.connect_robust(
        RABBITMQ_URI
    )
    channel = await connection.channel()

    # 1. 声明 Fanout 类型交换器,不存在就创建,存在就复用
    fanout_exchange = await channel.declare_exchange(
        exchange_name,
        aio_pika.ExchangeType.FANOUT,
        durable=True  # 交换器持久化
    )

    # 2. 定义需要绑定的队列名称列表
    queue_names = [queue_name_prefix + str(i) for i in range(3)]

    # 3. 循环创建队列并绑定到交换器
    for name in queue_names:
        # 声明队列（持久化）,不存在就创建,存在就复用
        queue = await channel.declare_queue(
            name,
            durable=True,
            auto_delete=False
        )
        # 绑定队列到 Fanout 交换器（忽略路由键）
        await queue.bind(fanout_exchange, routing_key="")


async def fanout_publish(message: str = "", exchange_name: str = "demo.fanout"):
    # 建立与RabbitMQ的连接
    connection = await aio_pika.connect_robust(
        RABBITMQ_URI
    )

    # 创建通道
    channel = await connection.channel()

    # 声明一个Fanout类型的交换器
    fanout_exchange = await channel.declare_exchange(
        exchange_name,  # 交换器名称
        aio_pika.ExchangeType.FANOUT,  # 交换器类型为FANOUT
        durable=True  # 持久化交换器
    )

    # 构建消息对象
    message = aio_pika.Message(
        body=message.encode("utf-8"),
        delivery_mode=aio_pika.DeliveryMode.PERSISTENT  # 消息持久化
    )

    # 发送消息到Fanout交换器
    # Fanout类型不需要需要指定routing_key，即使指定也会被忽略
    await fanout_exchange.publish(
        message,
        routing_key=""  # 路由键为空
    )
    await connection.close()