from fastapi import WebSocket, APIRouter,WebSocketDisconnect,Request,Body,Query
from fastapi import FastAPI, UploadFile, File, Form, Header, Depends
from fastapi.responses import StreamingResponse,JSONResponse
from fastapi.security import OAuth2PasswordBearer
from jose import JWTError, jwt
import logging
from fastapi import HTTPException
from Crypto.Cipher import AES
import base64,uuid,asyncio
import requests
from datetime import datetime,timedelta
from app.database import *
login_router = APIRouter()
logger = logging.getLogger("login")

# 初始化 OAuth2 方案（必须放在使用它的函数之前）
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")  # tokenUrl 对应登录接口路径

# 需要配置的参数（从环境变量获取）
WX_APPID = "wx446813bfb3a6985a"  #"wxed388cef83f109a3"  # 小程序appid
WX_SECRET = "a7455fca777ad59ce96cc154d62f795f"  #"f687afd2c8fae49b4aed2e4a8dd76e6e"  # 小程序密钥
WX_API_URL = "https://api.weixin.qq.com/sns/jscode2session"
JWT_SECRET_KEY = "3e5b8d7f1a9c2b6d4e0f1a9c2b6d4e0f1a9c2b6d4e0f1a9c2b6d4e0f1a9c2b6d"
ALGORITHM = "HS256"

# 伪数据库
fake_db = {
    "users": [],
    "museums": []
}

"""
1. SECRET_KEY 的作用
作用	说明
签名验证	用于签发（sign）和验证（verify）JWT 的合法性，防止令牌被篡改
安全保障	作为加密盐值（salt），确保令牌无法被伪造或逆向破解
身份验证	确保令牌是由可信的服务器颁发的，而非第三方伪造的
"""
# JWT工具函数
def create_jwt(user_id: str) -> str:
    payload = {
        "sub": user_id,
        "exp": datetime.utcnow() + timedelta(days=7)
    }
    return jwt.encode(payload, JWT_SECRET_KEY, algorithm=ALGORITHM)


def decrypt_data(encrypted_data: str, session_key: str, iv: str) -> dict:
    try:

        # Base64解码
        session_key_bin = base64.b64decode(session_key + "=")  # 补齐可能缺失的padding
        encrypted_data_bin = base64.b64decode(encrypted_data)
        iv_bin = base64.b64decode(iv)

        # 创建解密器
        cipher = AES.new(session_key_bin, AES.MODE_CBC, iv_bin)

        # 执行解密
        decrypted = cipher.decrypt(encrypted_data_bin)

        # 去除PKCS#7填充
        pad = decrypted[-1]
        decrypted = decrypted[:-pad]

        # 解析JSON
        result = json.loads(decrypted.decode('utf-8'))
        logging.info(f"解密数据: {result}")
        return result
    except json.JSONDecodeError:
        # 特定错误类型识别
        logging.info(f"解密过程失败: {str(e)}")
        raise ValueError("SESSION_KEY_MISMATCH")
    except Exception as e:
        logging.info(f"解密过程失败: {str(e)}")
        if "padding" in str(e).lower():
            raise ValueError("SESSION_KEY_EXPIRED")
        raise

async def get_wx_session(code: str):
    """
    调用微信接口获取session_key和openid
    返回: {"openid": str, "session_key": str}
    """
    params = {
        "appid": WX_APPID,
        "secret": WX_SECRET,
        "js_code": code,
        "grant_type": "authorization_code"
    }

    try:
        # 调用微信接口
        response = requests.get(WX_API_URL, params=params, timeout=5)
        response.raise_for_status()  # 检查HTTP状态码
        wx_data = response.json()
    except requests.exceptions.RequestException as e:
        raise HTTPException(
            status_code=502,
            detail=f"微信接口请求失败: {str(e)}"
        )
    except ValueError:
        raise HTTPException(
            status_code=502,
            detail="微信接口返回数据解析失败"
        )

    # 处理微信返回错误
    if "errcode" in wx_data:
        error_map = {
            40029: "无效的code",
            45011: "API调用太频繁",
            -1: "微信系统繁忙"
        }
        detail = error_map.get(
            wx_data["errcode"],
            f"微信接口错误: {wx_data.get('errmsg', '未知错误')}"
        )
        raise HTTPException(
            status_code=401,
            detail=detail
        )

    if "openid" not in wx_data:
        raise HTTPException(
            status_code=401,
            detail="微信认证失败：缺少openid"
        )
    return wx_data


@login_router.post("/login")
async def wechat_login(request: Request):
    # 获取原始请求数据
    try:
        data = await request.json()
    except json.JSONDecodeError:
        raise HTTPException(400, "Invalid JSON")
    # 校验必要参数
    required_fields = ["code", "encryptedData", "iv"]
    if not all(k in data for k in required_fields):
        raise HTTPException(400, "Missing required fields")
    code = data.get('code')
    encrypted_data = data['encryptedData']
    iv = data['iv']

    logging.info(f"wechat login data={data}")
    # 关键修改：增加重试机制
    max_retries = 2
    for attempt in range(max_retries):
        try:
            # 每次尝试都重新获取 session_key
            # 微信小程序登录 code 具有一次性特征（有效期约5分钟）
            # 添加冷启动保护延迟
            await asyncio.sleep(0.5)  # 关键延迟

            wx_data = await get_wx_session(code)
            session_key = wx_data["session_key"]
            openid = wx_data["openid"]
            logging.info(f"get_wx_session return {wx_data}")
            # 解密数据
            try:
                result = decrypt_data(encrypted_data, session_key, iv)
            except ValueError as e:
                # 特定错误处理
                if "SESSION_KEY_" in str(e):
                    raise HTTPException(418, "SESSION_KEY_INVALID")
                raise

            if 'purePhoneNumber' not in result:
                logging.warning("解密数据不包含手机号")
                phone_number = None
            else:
                phone_number = result['purePhoneNumber']
                break  # 成功则跳出循环

        except HTTPException as e:
            if attempt < max_retries - 1:
                # 特定错误时刷新 code
                if "invalid session_key" in str(e).lower():
                    logging.warning("Session key 过期，尝试刷新")
                    # 触发前端重新获取 code
                    raise HTTPException(401, "SESSION_KEY_EXPIRED")
                else:
                    logging.error(f"尝试 {attempt + 1} 失败: {str(e)}")
                    await asyncio.sleep(1)  # 短暂等待后重试
            else:
                logging.error(f"最终解密失败: {str(e)}")
                raise HTTPException(400, "Decrypt failed")
        except Exception as e:
            logging.error(f"解密异常: {str(e)}")
            if attempt == max_retries - 1:
                raise HTTPException(400, "Decrypt failed")

    logging.info(f"decrypt_data return {phone_number}")
    # ========== 数据库操作开始 ==========
    # 使用数据库查询替代内存查询
    db_users = get_users(openid=openid)
    user = db_users[0] if db_users else None

    # 用户不存在时创建新用户
    if not user:
        try:
            new_user = {
                "user_id": str(uuid.uuid4()),  # 使用UUID生成唯一ID
                "openid": wx_data["openid"],
                "phone": str(phone_number),
                "status": 1,  # 默认启用状态
                "balance": 0,   # 初始余额设为0
                "is_test_account":0
                # museums字段需要另存关联表，此处暂时保留伪数据
            }
            create_user(new_user)  # 调用CRUD创建方法
            user = new_user
        except Exception as e:  # 捕获唯一约束等异常
            logging.error(f"User creation failed: {str(e)}")
            raise HTTPException(500, "User registration failed")

    # 更新最后登录时间
    update_data = {
        "last_login_time": int(datetime.now().timestamp()),
        "token": create_jwt(user["user_id"])  # 生成新token
    }
    updated_user = update_user(user["user_id"], update_data)
    # ========== 数据库操作结束 ==========

    logging.info(f"login return {user}")
    # 生成token
    return JSONResponse({
        "token": create_jwt(user["user_id"]),
        "user_info": {
            "phone": phone_number,
            "museums": get_museum_avail(user)
        }
    })

fake_phone_number = {
    'hxbtest001':'19912345631',
    'hxbtest002':'19912345632',
    'hxbtest003':'19912345633',
    'hxbtest004':'19912345634',
    'hxbtest005':'19912345635',
}
@login_router.post("/testAccountLogin")
async def test_account_login(request: Request):
    # 获取原始请求数据
    try:
        data = await request.json()
    except json.JSONDecodeError:
        raise HTTPException(400, "Invalid JSON")
    # 校验必要参数
    required_fields = ["account"]
    if not all(k in data for k in required_fields):
        raise HTTPException(400, "Missing required fields")
    account = data.get('account')
    phone_number = fake_phone_number.get(account,'19923145671')
    logging.info(f"decrypt_data return {phone_number}")
    # ========== 数据库操作开始 ==========
    # 使用数据库查询替代内存查询
    db_users = get_users(openid=account)
    user = db_users[0] if db_users else None

    # 用户不存在时创建新用户
    if not user:
        try:
            new_user = {
                "user_id": str(uuid.uuid4()),  # 使用UUID生成唯一ID
                "openid": account,
                "phone": phone_number,
                "status": 1,  # 默认启用状态
                "balance": 0,   # 初始余额设为0
                "is_test_account": 1
                # museums字段需要另存关联表，此处暂时保留伪数据
            }
            create_user(new_user)  # 调用CRUD创建方法
            user = new_user
        except Exception as e:  # 捕获唯一约束等异常
            logging.error(f"User creation failed: {str(e)}")
            raise HTTPException(500, "User registration failed")

    # 更新最后登录时间
    update_data = {
        "last_login_time": int(datetime.now().timestamp()),
        "token": create_jwt(user["user_id"])  # 生成新token
    }
    updated_user = update_user(user["user_id"], update_data)
    # ========== 数据库操作结束 ==========

    logging.info(f"test account login return {user}")
    # 生成token
    return JSONResponse({
        "token": create_jwt(user["user_id"]),
        "user_info": {
            "phone": phone_number,
            "museums": get_museum_avail(user)
        }
    })

def get_museum_avail(user):
    museum_list = get_museums(None, None)
    id_list = [museum['id'] for museum in museum_list]
    return id_list

from Crypto.Cipher import AES
import base64
import json
import requests


def decrypt_wechat_phone(
        encrypted_data: str,
        code: str,
        appid: str,
        secret: str
) -> str:
    """
    微信手机号解密函数（完整本地处理版）

    参数：
    encrypted_data: 前端传递的加密数据
    code: 前端通过uni.login获取的临时code
    appid: 小程序appid
    secret: 小程序appsecret

    返回：
    str: 解密后的手机号

    异常：
    ValueError: 当任何步骤失败时抛出
    """
    # 步骤1：获取session_key
    params = {
        "appid": WX_APPID,
        "secret": WX_SECRET,
        "js_code": code,
        "grant_type": "authorization_code"
    }

    try:
        response = requests.get(WX_API_URL, params=params, timeout=5)
        response.raise_for_status()
        wx_data = response.json()

        if 'session_key' not in wx_data:
            raise ValueError(f"获取session_key失败: {wx_data.get('errmsg', '未知错误')}")

        session_key = wx_data['session_key']
        iv = encrypted_data.split('=')[1][:24]  # 从加密数据中提取iv（根据实际情况调整）
    except Exception as e:
        raise ValueError(f"微信接口请求失败: {str(e)}")

    # 步骤2：执行AES解密
    try:
        # Base64解码
        session_key_bin = base64.b64decode(session_key + "=")  # 补齐可能缺失的padding
        encrypted_data_bin = base64.b64decode(encrypted_data)
        iv_bin = base64.b64decode(iv)

        # 创建解密器
        cipher = AES.new(session_key_bin, AES.MODE_CBC, iv_bin)

        # 执行解密
        decrypted = cipher.decrypt(encrypted_data_bin)

        # 去除PKCS#7填充
        pad = decrypted[-1]
        decrypted = decrypted[:-pad]

        # 解析JSON
        result = json.loads(decrypted.decode('utf-8'))

        if 'purePhoneNumber' not in result:
            raise ValueError("解密数据不包含手机号")

        return result['purePhoneNumber']
    except Exception as e:
        raise ValueError(f"解密过程失败: {str(e)}")


# 在 login_service.py 中添加以下内容

async def optional_current_user(token: str = Depends(oauth2_scheme)):
    """
    可选用户依赖项（不抛出401错误）
    返回: 用户对象 或 None
    """
    try:
        payload = jwt.decode(token, JWT_SECRET_KEY, algorithms=[ALGORITHM])
        user_id = payload.get("sub")
        return get_user_by_id(user_id)
    except (JWTError, StopIteration):
        return None

@login_router.get("/verify")
async def verify_token(user: dict = Depends(optional_current_user)):
    """
    Token 验证接口
    返回格式：
    {
        "valid": bool,
        "user": {
            "user_id": str,
            "phone": str,
            "museums": List[int]
        } | null
    }
    """
    logging.info(f"verify_token user={user}")
    if user:
        return JSONResponse({
            "valid": True,
            "user": {
                "user_id": user["user_id"],
                "phone": user["phone"],
                #"museums": user["museums"]
            }
        })
    else:
        return JSONResponse({
            "valid": False,
            "user": None,
            "detail": "无效的认证凭据"
        })

@login_router.get("/get_museum_list")
async def get_museum_list(current_user = Depends(optional_current_user)):
    #orders = Order.query.filter_by(user_id=current_user.id).all()
    logging.info(f"get_museum_list user={current_user}")
    museums_paid = get_users_museums_by_user_id(current_user.get('user_id'))
    paid_id_list = [museum['museum_id'] for museum in museums_paid]
    logging.info(f"get_museum_list paid={paid_id_list}")
    museum_list = get_museums(None, None)
    for museum in museum_list:
        if museum.get('id') in paid_id_list:
            museum['paid'] = True
        else:
            museum['paid'] = False
    try:
        return JSONResponse(museum_list)
    except Exception as e:
        raise HTTPException(500, str(e))

@login_router.get("/get_museum_id_auth")
async def get_museum_id_auth(current_user = Depends(optional_current_user)):
    try:
        museum_list = get_museums(None, None)
        id_list = [museum['id'] for museum in museum_list]
        logging.info(f"get_museum_id_auth={id_list}")
        return JSONResponse(id_list)
    except Exception as e:
        raise HTTPException(500, str(e))