"""
MQTT Publisher — 向 chongming Worker 发送 MQTT 请求

用法:
  python publisher.py <worker_type> <operation> [json_payload]

示例（信封协议，meta 可选）:
  python publisher.py example add '{"meta": {"method": "GET"}, "data": {"a": 3, "b": 5}}'
  python publisher.py example add '{"a": 3, "b": 5}'          # 扁平载荷自动包装（method=GET）
  python publisher.py example add '{"meta": {"method": "MQTT"}, "data": {"a": 3, "b": 5}}'
"""

import asyncio
import sys
import json
import logging
from amqtt.client import MQTTClient
from amqtt.mqtt.constants import QOS_1

logging.basicConfig(level=logging.INFO)

# MQTT 主题前缀（与 mqtt_bridge.py 保持一致）
PREFIX = "chongming"

# 默认参数
DEFAULT_WORKER = "example"
DEFAULT_OP = "add"
DEFAULT_PAYLOAD = {"meta": {"method": "GET"}, "data": {"a": 3, "b": 5}}

async def main():
    worker_type = sys.argv[1] if len(sys.argv) > 1 else DEFAULT_WORKER
    operation = sys.argv[2] if len(sys.argv) > 2 else DEFAULT_OP
    payload_str = sys.argv[3] if len(sys.argv) > 3 else json.dumps(DEFAULT_PAYLOAD)

    topic = f"{PREFIX}/{worker_type}/{operation}"
    payload = json.loads(payload_str)
    # 扁平载荷自动包装为信封（method 默认 GET），已含 meta/data 则原样使用
    if not (isinstance(payload, dict) and ("meta" in payload or "data" in payload)):
        payload = {"meta": {"method": "GET"}, "data": payload}

    client = MQTTClient()
    await client.connect("mqtt://localhost:1883/")

    await client.publish(topic, json.dumps(payload).encode("utf-8"), QOS_1)
    print(f"[Publisher] Sent to '{topic}': {payload}")

    await client.disconnect()
    print("[Publisher] Disconnected")

if __name__ == "__main__":
    asyncio.run(main())