import sys
from contextlib import asynccontextmanager
from typing import Dict, Any

import yaml
from v2.nacos import ClientConfigBuilder, GRPCConfig, NacosNamingService, RegisterInstanceParam, DeregisterInstanceParam, NacosConfigService, ConfigParam

try:
    import asyncore
except ImportError:
    import pyasyncore

    sys.modules['asyncore'] = pyasyncore
import logging.config

import uvicorn
from fastapi import FastAPI, Depends
from fastapi import HTTPException
from fastapi.responses import JSONResponse

from app.api.api_route import router
from app.core.config import settings, get_settings, Settings
from app.schemas.response_template import ResponseModel
from logging_env import LOGGER_CONFIG_DICT
from starlette.middleware.cors import CORSMiddleware

logging.config.dictConfig(LOGGER_CONFIG_DICT)
logging.getLogger("pika").setLevel(logging.WARNING)

logger = logging.getLogger(__name__)

naming_client: NacosNamingService | None = None
config_client: NacosConfigService | None = None
current_config: dict = {}

# ==================== 配置区 ====================
NACOS_SERVER = "18.167.251.121:28848"  # ← 改成你 Nacos 的公网IP:8848（推荐标准端口）
NACOS_USERNAME = "nacos"
NACOS_PASSWORD = "Aidlab123123!"
NAMESPACE_ID = "zcr"  # 你的 namespace_id
SERVICE_NAME = "fastapi-demo-service"
SERVICE_GROUP = "DEFAULT_GROUP"
SERVICE_PORT = 8040  # FastAPI 监听端口
REGISTER_IP = "10.1.1.43"

# 配置相关
CONFIG_DATA_ID = "aida.python"
CONFIG_GROUP = "LOCAL"

nacos_config_data: Dict[str, Any] = {}


@asynccontextmanager
async def lifespan(app: FastAPI):
    """FastAPI 生命周期管理：启动时注册，关闭时注销"""
    global naming_client, config_client
    global nacos_config_data, settings

    client_config = (
        ClientConfigBuilder()
        .username(NACOS_USERNAME)
        .password(NACOS_PASSWORD)
        .namespace_id(NAMESPACE_ID)
        .server_address(NACOS_SERVER)
        .log_level("DEBUG")  # 先开 DEBUG 方便排查
        .grpc_config(GRPCConfig(grpc_timeout=5000))
        .build()
    )
    # Naming Service（服务注册发现）
    naming_client = await NacosNamingService.create_naming_service(client_config)
    logger.info("Nacos NamingService 初始化成功")
    config_client = await NacosConfigService.create_config_service(client_config)
    logger.info("Nacos ConfigService 初始化成功")

    # ==================== 1. 获取配置 ====================
    try:
        config_param = ConfigParam(data_id=CONFIG_DATA_ID, group=CONFIG_GROUP, )
        config_content = await config_client.get_config(config_param)
        logger.info(f"获取配置: {config_content}")
        if config_content:
            loaded = yaml.safe_load(config_content) or {}
            nacos_config_data = loaded
            # 用 Nacos 配置覆盖 settings
            for key, value in loaded.items():
                if hasattr(settings, key):
                    setattr(settings, key, value)
            logger.info(f"✅ Nacos 配置加载成功: {CONFIG_DATA_ID} | 覆盖字段数量: {len(loaded)}")
        else:
            logger.warning("Nacos 返回配置为空，使用 .env + 默认值")

        # 2. 注册动态监听器（配置变更自动刷新）
        async def listener(content: str):

            try:
                new_config = yaml.safe_load(content) if content else {}
                nacos_config_data = new_config
                # 实时覆盖 settings
                for key, value in new_config.items():
                    if hasattr(settings, key):
                        old_val = getattr(settings, key)
                        setattr(settings, key, value)
                        if old_val != value:
                            logger.info(f"🔄 配置更新 → {key}: {old_val} → {value}")
                logger.info(f"【Nacos 动态更新】{CONFIG_DATA_ID}")
            except Exception as e:
                logger.error(f"Nacos 配置解析失败: {e}")

        await config_client.add_listener(CONFIG_DATA_ID, CONFIG_GROUP, listener)
        logger.info("✅ Nacos 配置监听器已注册（支持热更新）")
    except Exception as e:
        logger.error(f"获取配置失败: {e}")
        current_config["content"] = "获取配置失败"

    # ====================2. 注册到 Nacos ====================
    try:
        register_param = RegisterInstanceParam(
            service_name=SERVICE_NAME,
            group_name=SERVICE_GROUP,
            ip=REGISTER_IP,
            port=SERVICE_PORT,
            weight=1.0,
            cluster_name="DEFAULT",
            metadata={"version": "1.0", "framework": "fastapi"},
            enabled=True,
            healthy=True,
            ephemeral=False,  # ← 先用 False 测试，成功后再改成 True
        )

        response = await naming_client.register_instance(request=register_param)
        logger.info(f"Nacos 注册成功！Response: {response}")
        print(f"✅ 服务已注册到 Nacos: {SERVICE_NAME} @ {REGISTER_IP}:{SERVICE_PORT}")
    except Exception as e:
        logger.error(f"Nacos 注册失败: {e}")

    yield  # FastAPI 正常运行

    # ====================3. 应用关闭时注销 ====================
    if naming_client:
        try:
            deregister_param = DeregisterInstanceParam(
                service_name=SERVICE_NAME,
                group_name=SERVICE_GROUP,
                ip=REGISTER_IP,
                port=SERVICE_PORT,
                cluster_name="DEFAULT",
            )
            await naming_client.deregister_instance(request=deregister_param)
            logger.info("Nacos 注销成功")
        except Exception as e:
            logger.warning(f"Nacos 注销失败: {e}")


app = FastAPI(lifespan=lifespan, docs_url="/docs", redoc_url='/re-docs', openapi_url=f"/openapi.json", description=''' Base frame with FastAPI - Super Resolution API ''')
app.add_middleware(CORSMiddleware, allow_origins=["*"], allow_credentials=True, allow_methods=["*"], allow_headers=["*"], )
app.include_router(router=router)


@app.exception_handler(HTTPException)
async def http_exception_handler(exc: HTTPException):
    return JSONResponse(
        status_code=exc.status_code,
        content=ResponseModel(code=exc.status_code, msg=exc.detail, data=exc.detail).dict()
    )


@app.get("/health")
async def health():
    return {"status": "ok", "env": settings.SERVE_ENV}


@app.get("/config")
async def show_config(s: Settings = Depends(get_settings)):
    """查看当前完整配置（生产环境建议加权限）"""
    return s.model_dump()


if __name__ == '__main__':
    uvicorn.run(app, host="0.0.0.0", port=settings.PORT)