import asyncio
import json
from datetime import date

from fastapi import APIRouter, Query, HTTPException, Request, Path
from mysql.connector import Error as MySQLError
from ds.db import db
from encryption.encrypt_decorator import encrypt_response
from schema.device_schema import (
    DeviceCreateRequest, DeviceResponse, DeviceListResponse,
    DeviceStatusHistoryResponse, DeviceStatusHistoryListResponse
)
from schema.response_schema import APIResponse
from service.device_service import update_online_status_by_ip
from ws.ws import get_current_time_str, aes_encrypt, is_client_connected

router = APIRouter(
    prefix="/api/devices",
    tags=["设备管理"]
)


# 创建设备信息接口
@router.post("/add", response_model=APIResponse, summary="创建设备信息")
@encrypt_response()
async def create_device(device_data: DeviceCreateRequest, request: Request):
    conn = None
    cursor = None
    try:
        conn = db.get_connection()
        cursor = conn.cursor(dictionary=True)

        # 检查设备是否已存在
        cursor.execute("SELECT * FROM devices WHERE client_ip = %s", (device_data.ip,))
        existing_device = cursor.fetchone()
        if existing_device:
            # 更新设备为在线状态
            from service.device_service import update_online_status_by_ip
            update_online_status_by_ip(client_ip=device_data.ip, online_status=1)
            return APIResponse(
                code=200,
                message=f"设备IP {device_data.ip} 已存在、返回已有设备信息",
                data=DeviceResponse(**existing_device)
            )

        # 通过 User-Agent 判断设备类型
        user_agent = request.headers.get("User-Agent", "").lower()
        device_type = "unknown"
        if user_agent == "default":
            device_type = device_data.params.get("os") if (device_data.params and isinstance(device_data.params, dict)) else "unknown"
        elif "windows" in user_agent:
            device_type = "windows"
        elif "android" in user_agent:
            device_type = "android"
        elif "linux" in user_agent:
            device_type = "linux"

        device_params_json = json.dumps(device_data.params) if device_data.params else None

        # 插入新设备
        insert_query = """
            INSERT INTO devices 
            (client_ip, hostname, device_online_status, device_type, alarm_count, params, is_need_handler)
            VALUES (%s, %s, %s, %s, %s, %s, %s)
        """
        cursor.execute(insert_query, (
            device_data.ip,
            device_data.hostname,
            0,
            device_type,
            0,
            device_params_json,
            0
        ))
        conn.commit()

        # 获取新设备并返回
        device_id = cursor.lastrowid
        cursor.execute("SELECT * FROM devices WHERE id = %s", (device_id,))
        new_device = cursor.fetchone()

        return APIResponse(
            code=200,
            message="设备创建成功",
            data=DeviceResponse(**new_device)
        )

    except MySQLError as e:
        if conn:
            conn.rollback()
        raise Exception(f"创建设备失败: {str(e)}") from e
    except json.JSONDecodeError as e:
        raise Exception(f"设备参数JSON序列化失败: {str(e)}") from e
    except Exception as e:
        if conn:
            conn.rollback()
        raise e
    finally:
        db.close_connection(conn, cursor)


# ------------------------------
# 获取设备列表接口
# ------------------------------
@router.get("/", response_model=APIResponse, summary="获取设备列表（支持筛选分页）")
@encrypt_response()
async def get_device_list(
        page: int = Query(1, ge=1, description="页码、默认第1页"),
        page_size: int = Query(10, ge=1, le=100, description="每页条数、1-100之间"),
        device_type: str = Query(None, description="按设备类型筛选"),
        online_status: int = Query(None, ge=0, le=1, description="按在线状态筛选")
):
    conn = None
    cursor = None
    try:
        conn = db.get_connection()
        cursor = conn.cursor(dictionary=True)

        where_clause = []
        params = []

        if device_type:
            where_clause.append("device_type = %s")
            params.append(device_type)
        if online_status is not None:
            where_clause.append("device_online_status = %s")
            params.append(online_status)

        # 统计总数
        count_query = "SELECT COUNT(*) AS total FROM devices"
        if where_clause:
            count_query += " WHERE " + " AND ".join(where_clause)
        cursor.execute(count_query, params)
        total = cursor.fetchone()["total"]

        # 分页查询列表
        offset = (page - 1) * page_size
        list_query = "SELECT * FROM devices"
        if where_clause:
            list_query += " WHERE " + " AND ".join(where_clause)
        list_query += " ORDER BY id DESC LIMIT %s OFFSET %s"
        params.extend([page_size, offset])

        cursor.execute(list_query, params)
        device_list = cursor.fetchall()

        return APIResponse(
            code=200,
            message="获取设备列表成功",
            data=DeviceListResponse(
                total=total,
                devices=[DeviceResponse(**device) for device in device_list]
            )
        )

    except MySQLError as e:
        raise Exception(f"获取设备列表失败: {str(e)}") from e
    finally:
        db.close_connection(conn, cursor)


# ------------------------------
# 获取设备上下线记录接口
# ------------------------------
@router.get("/status-history", response_model=APIResponse, summary="获取设备上下线记录")
@encrypt_response()
async def get_device_status_history(
        client_ip: str = Query(None, description="客户端IP地址（非必填，为空时返回所有设备记录）"),
        page: int = Query(1, ge=1, description="页码、默认第1页"),
        page_size: int = Query(10, ge=1, le=100, description="每页条数、1-100之间"),
        start_date: date = Query(None, description="开始日期、格式YYYY-MM-DD"),
        end_date: date = Query(None, description="结束日期、格式YYYY-MM-DD")
):
    conn = None
    cursor = None
    try:
        conn = db.get_connection()
        cursor = conn.cursor(dictionary=True)

        # 1. 检查设备是否存在（仅传IP时）：强制指定Collation
        if client_ip is not None:
            # 关键调整1：WHERE条件中给d.client_ip指定Collation（与da一致或反之）
            check_query = """
                SELECT id FROM devices 
                WHERE client_ip COLLATE utf8mb4_general_ci = %s COLLATE utf8mb4_general_ci
            """
            cursor.execute(check_query, (client_ip,))
            device = cursor.fetchone()
            if not device:
                raise HTTPException(status_code=404, detail=f"客户端IP为 {client_ip} 的设备不存在")

        # 2. 构建WHERE条件
        where_clause = []
        params = []

        # 关键调整2：传IP时，强制指定da.client_ip的Collation
        if client_ip is not None:
            where_clause.append("da.client_ip COLLATE utf8mb4_general_ci = %s COLLATE utf8mb4_general_ci")
            params.append(client_ip)
        if start_date:
            where_clause.append("DATE(da.created_at) >= %s")
            params.append(start_date.strftime("%Y-%m-%d"))
        if end_date:
            where_clause.append("DATE(da.created_at) <= %s")
            params.append(end_date.strftime("%Y-%m-%d"))

        # 3. 统计总数：JOIN时强制统一Collation
        count_query = """
            SELECT COUNT(*) AS total 
            FROM device_action da 
            LEFT JOIN devices d 
                ON da.client_ip COLLATE utf8mb4_general_ci = d.client_ip COLLATE utf8mb4_general_ci
        """
        if where_clause:
            count_query += " WHERE " + " AND ".join(where_clause)
        cursor.execute(count_query, params)
        total = cursor.fetchone()["total"]

        # 4. 分页查询：JOIN时强制统一Collation
        offset = (page - 1) * page_size
        list_query = """
            SELECT da.*, d.id AS device_id 
            FROM device_action da 
            LEFT JOIN devices d 
                ON da.client_ip COLLATE utf8mb4_general_ci = d.client_ip COLLATE utf8mb4_general_ci
        """
        if where_clause:
            list_query += " WHERE " + " AND ".join(where_clause)
        list_query += " ORDER BY da.created_at DESC LIMIT %s OFFSET %s"
        params.extend([page_size, offset])
        cursor.execute(list_query, params)
        history_list = cursor.fetchall()

        # 后续格式化响应逻辑不变...
        formatted_history = []
        for item in history_list:
            formatted_item = {
                "id": item["id"],
                "device_id": item["device_id"],  # 可能为None（IP无对应设备）
                "client_ip": item["client_ip"],
                "status": item["action"],
                "status_time": item["created_at"]
            }
            formatted_history.append(formatted_item)

        return APIResponse(
            code=200,
            message="获取设备上下线记录成功",
            data=DeviceStatusHistoryListResponse(
                total=total,
                history=[DeviceStatusHistoryResponse(**item) for item in formatted_history]
            )
        )

    except MySQLError as e:
        raise Exception(f"获取设备上下线记录失败: {str(e)}") from e
    finally:
        db.close_connection(conn, cursor)

# ------------------------------
# 通过客户端IP设置设备is_need_handler为0接口
# ------------------------------
@router.post("/need-handler/reset", response_model=APIResponse, summary="解封客户端")
@encrypt_response()
async def reset_device_need_handler(
    client_ip: str = Query(..., description="目标设备的客户端IP地址（必填）")
):
    try:
        from service.device_service import update_is_need_handler_by_client_ip
        success = update_is_need_handler_by_client_ip(
            client_ip=client_ip,
            is_need_handler=0  # 固定设置为0（不需要处理）
        )

        if success:
            online_status = is_client_connected(client_ip)

            # 如果设备在线，则发送消息给前端
            if online_status:
                # 调用 ws 发送一个消息给前端、告诉他已解锁
                unlock_msg = {
                    "type": "unlock",
                    "timestamp": get_current_time_str(),
                    "client_ip": client_ip
                }
                from ws.ws import send_message_to_client
                await send_message_to_client(client_ip, json.dumps(unlock_msg))

                # 休眠 100 ms
                await asyncio.sleep(0.1)

                frame_permit_msg = {
                    "type": "frame",
                    "timestamp": get_current_time_str(),
                    "client_ip": client_ip
                }
                await send_message_to_client(client_ip, json.dumps(frame_permit_msg))

                # 更新设备在线状态为1
                update_online_status_by_ip(client_ip, 1)

            return APIResponse(
                code=200,
                message=f"设备已解封",
                data={
                    "client_ip": client_ip,
                    "is_need_handler": 0,
                    "status_desc": "设备已解封"
                }
            )

    # 捕获工具方法抛出的业务异常（如IP为空、设备不存在）
    except ValueError as e:
        # 业务异常返回400/404状态码（与现有接口异常规范一致）
        raise HTTPException(
            status_code=404 if "设备不存在" in str(e) else 400,
            detail=str(e)
        ) from e

    # 捕获数据库层面异常（如连接失败、SQL执行错误）
    except MySQLError as e:
        raise Exception(f"设置is_need_handler失败：数据库操作异常 - {str(e)}") from e

    # 捕获其他未知异常
    except Exception as e:
        raise Exception(f"设置is_need_handler失败：未知错误 - {str(e)}") from e