import json
import os
from typing import Any, Dict
import asyncio

RABBITMQ_URL = os.getenv("RABBITMQ_URL") or (
    f"amqp://{os.getenv('RABBITMQ_USERNAME', 'user')}:"
    f"{os.getenv('RABBITMQ_PASSWORD', 'bitnami123')}@"
    f"{os.getenv('RABBITMQ_HOST', 'localhost')}:"
    f"{os.getenv('RABBITMQ_PORT', '5672')}"
)
QUEUE_NAME = os.getenv("MAIL_QUEUE", "mail_queue")

async def _publish_async(message: Dict[str, Any]) -> None:
    import aio_pika
    connection = await aio_pika.connect_robust(RABBITMQ_URL)
    try:
        channel = await connection.channel()
        await channel.declare_queue(QUEUE_NAME, durable=True)
        body = json.dumps(message).encode("utf-8")
        await channel.default_exchange.publish(
            aio_pika.Message(body=body, delivery_mode=aio_pika.DeliveryMode.PERSISTENT),
            routing_key=QUEUE_NAME,
        )
    finally:
        await connection.close()

def enqueue_email(to: str, subject: str, body: str) -> None:
    message = {"type": "email", "to": to, "subject": subject, "body": body}
    try:
        loop = asyncio.get_running_loop()
        loop.create_task(_publish_async(message))
    except RuntimeError:
        asyncio.run(_publish_async(message))