"""模块：子服务器 AppConfig
Django 启动时自动完成 MSYNC Socket.IO 桥接——连接、注册、认证、心跳。"""

import logging
import threading
from django.apps import AppConfig
from django.conf import settings

logger = logging.getLogger(__name__)

# 与主服务器约定的 SDK 最低版本——版本不一致时启动警告
REQUIRED_GVSDSDK_VERSION = '1.1.0'


class SubServerConfig(AppConfig):
    default_auto_field = 'django.db.models.BigAutoField'
    name = 'apps.sub_server'
    verbose_name = 'SMANAGE 子服务器'
    verbose_name_plural = 'SMANAGE 子服务器'

    def ready(self):
        # 1) 校验 gvsdsdk 版本与主服务器一致
        self._check_sdk_version()
        # 2) 注册实验本地事务处理器（供主服务器 Saga 编排回调）
        self._register_local_handlers()
        # 3) 启动 MSYNC 桥接
        self._connect_msync()

    def _register_local_handlers(self):
        try:
            from .local_handlers import RegisterExperimentHandlers
            RegisterExperimentHandlers()
            logger.info('实验本地事务处理器已注册: demo_a/demo_b/demo_fail/demo_flaky')
        except Exception as e:
            logger.error(f'实验本地事务处理器注册失败: {e}')

    def _check_sdk_version(self):
        try:
            import gvsdsdk
            info = gvsdsdk.get_version_info()
            logger.info(f'[SDK] 加载: v{info["Version"]} @ {info["Location"]}')
            ok, msg = gvsdsdk.check_min_version(REQUIRED_GVSDSDK_VERSION)
            if ok:
                logger.info(f'[SDK] {msg}')
            else:
                logger.warning(f'[SDK] 版本不符！{msg}。双端 gvsdsdk 版本必须一致！')
        except ImportError as e:
            logger.error(f'[SDK] gvsdsdk 未安装: {e}')
        except Exception as e:
            logger.error(f'[SDK] 版本检查失败: {e}')

    def _connect_msync(self):
        try:
            from msync_client.sio_client import MSyncSocketClient

            msync_client = MSyncSocketClient(
                master_url=settings.MSYNC_MASTER_URL,
                service_name=settings.MSYNC_SERVICE_NAME,
                service_domain=settings.MSYNC_SERVICE_DOMAIN,
                service_secret=settings.MSYNC_SERVICE_SECRET,
                scope=settings.MSYNC_SERVICE_SCOPE,
                heartbeat_interval=settings.MSYNC_HEARTBEAT_INTERVAL,
                metadata={'DBName': settings.DATABASES['default']['NAME']},
            )

            setattr(settings, 'MSYNC_CLIENT', msync_client)

            t = threading.Thread(target=msync_client.Connect, daemon=True)
            t.start()
            logger.info('MSYNC Socket.IO 桥接线程已启动')
        except Exception as e:
            logger.error(f'MSYNC 桥接启动失败: {e}')