"""
IoT 工单只读 ORM 模型

映射 aiot-platform 库的工单表，vsp-service 通过第二个 SQLAlchemy 引擎跨库只读查询。
"""

from datetime import datetime
from typing import Optional

from sqlalchemy import (
    Column, String, Integer, SmallInteger, BigInteger, DateTime, Text,
    create_engine, Index,
)
from sqlalchemy.orm import declarative_base, sessionmaker

from app.config import settings
from app.utils.logger import logger

IotBase = declarative_base()


class IotOpsOrder(IotBase):
    """IoT 通用工单主表（只读）"""
    __tablename__ = "ops_order"

    id = Column(BigInteger, primary_key=True)
    order_code = Column(String(64), comment="工单编号")
    order_type = Column(String(32), comment="工单类型: SECURITY/CLEAN")
    title = Column(String(200), comment="工单标题")
    description = Column(Text, comment="工单描述")
    priority = Column(SmallInteger, comment="优先级: 0低/1中/2高")
    status = Column(String(32), comment="状态: PENDING/ASSIGNED/ARRIVED/PAUSED/COMPLETED/CANCELLED")
    area_id = Column(BigInteger, comment="区域ID")
    location = Column(String(200), comment="位置")
    assignee_id = Column(BigInteger, comment="指派人ID")
    assignee_name = Column(String(100), comment="指派人姓名")
    start_time = Column(DateTime, comment="开始时间")
    end_time = Column(DateTime, comment="结束时间")
    creator = Column(String(64), comment="创建者")
    create_time = Column(DateTime, comment="创建时间")
    update_time = Column(DateTime, comment="更新时间")
    deleted = Column(SmallInteger, default=0, comment="是否删除")
    tenant_id = Column(BigInteger, default=0, comment="租户编号")


class IotOpsOrderSecurityExt(IotBase):
    """安保工单扩展表（只读）"""
    __tablename__ = "ops_order_security_ext"

    id = Column(BigInteger, primary_key=True)
    ops_order_id = Column(BigInteger, nullable=False, comment="工单ID")
    alarm_id = Column(String(64), comment="关联告警ID")
    alarm_type = Column(String(32), comment="告警类型")
    camera_id = Column(String(64), comment="摄像头ID")
    camera_name = Column(String(128), comment="摄像头名称")
    roi_id = Column(String(64), comment="ROI区域ID")
    image_url = Column(String(512), comment="截图URL")
    assigned_user_id = Column(BigInteger, comment="处理人ID")
    assigned_user_name = Column(String(100), comment="处理人姓名")
    result = Column(Text, comment="处理结果")
    result_img_urls = Column(Text, comment="结果图片URL")
    false_alarm = Column(SmallInteger, comment="是否误报")
    dispatched_time = Column(DateTime, comment="派单时间")
    confirmed_time = Column(DateTime, comment="确认时间")
    completed_time = Column(DateTime, comment="完成时间")
    creator = Column(String(64))
    create_time = Column(DateTime)
    updater = Column(String(64))
    update_time = Column(DateTime)
    deleted = Column(SmallInteger, default=0)
    tenant_id = Column(BigInteger, default=0)


class IotOpsOrderCleanExt(IotBase):
    """保洁工单扩展表（只读）"""
    __tablename__ = "ops_order_clean_ext"

    id = Column(BigInteger, primary_key=True)
    ops_order_id = Column(BigInteger, nullable=False, comment="工单ID")
    is_auto = Column(SmallInteger, default=1, comment="是否自动工单")
    expected_duration = Column(Integer, comment="预计作业时长(分钟)")
    arrived_time = Column(DateTime, comment="实际到岗时间")
    completed_time = Column(DateTime, comment="实际完成时间")
    pause_start_time = Column(DateTime, comment="暂停开始时间")
    pause_end_time = Column(DateTime, comment="暂停结束时间")
    total_pause_seconds = Column(Integer, default=0, comment="累计暂停时长(秒)")
    cleaning_type = Column(String(32), comment="保洁类型: ROUTINE/DEEP/SPOT/EMERGENCY")
    difficulty_level = Column(SmallInteger, comment="难度等级(1-5)")
    creator = Column(String(64))
    create_time = Column(DateTime)
    updater = Column(String(64))
    update_time = Column(DateTime)
    deleted = Column(SmallInteger, default=0)
    tenant_id = Column(BigInteger, default=0)
    dispatched_time = Column(DateTime, comment="实际下发时间")
    first_dispatched_time = Column(DateTime, comment="首次下发时间")


# ==================== IoT 数据库连接管理 ====================

_iot_engine = None
_IotSessionLocal = None


def get_iot_engine():
    """获取 IoT 数据库引擎（懒初始化）"""
    global _iot_engine
    if _iot_engine is None:
        iot_url = settings.iot_database_url
        if not iot_url:
            raise RuntimeError("IOT_DATABASE_URL 未配置，无法连接 IoT 数据库")
        # mysql+mysqlconnector 需要 connect_args 传递认证参数
        connect_args = {}
        if "mysqlconnector" in iot_url:
            connect_args = {"use_pure": True, "ssl_disabled": True}
        _iot_engine = create_engine(
            iot_url,
            echo=False,
            pool_recycle=1800,
            pool_pre_ping=True,
            connect_args=connect_args,
        )
        logger.info(f"IoT 数据库引擎已创建")
    return _iot_engine


def get_iot_session():
    """获取 IoT 数据库只读 session"""
    global _IotSessionLocal
    if _IotSessionLocal is None:
        _IotSessionLocal = sessionmaker(
            bind=get_iot_engine(), autocommit=False, autoflush=False,
        )
    return _IotSessionLocal()


def close_iot_db():
    """关闭 IoT 数据库连接"""
    global _iot_engine, _IotSessionLocal
    if _iot_engine:
        _iot_engine.dispose()
        _iot_engine = None
    _IotSessionLocal = None