# =============================================================================
# 企微IT智能服务台 — 统一认证 API
# =============================================================================
# 说明：统一认证入口，整合现有的扫码登录和企微SSO
# 三端认证重构：取消OTP/账号密码登录，统一为企微扫码认证
#
# API 端点列表：
#   GET  /api/auth/qrcode          — 获取扫码登录二维码
#   GET  /api/auth/scan/status    — 轮询扫码状态
#   GET  /api/auth/oauth2/callback — OAuth2回调处理
#   POST /api/auth/bind           — 账号绑定(互联企业)
#   POST /api/auth/verify         — 验证Token
#   POST /api/auth/logout         — 登出
#   GET  /api/auth/me             — 获取当前用户信息
#   POST /api/auth/switch-role    — 切换角色
# =============================================================================

import logging
from typing import Optional

import redis.asyncio as aioredis
from fastapi import APIRouter, Depends, Query, Request
from sqlalchemy.ext.asyncio import AsyncSession

from app.config import settings
from app.database import get_db
from app.dependencies import UserInfo, get_current_user, get_redis
from app.schemas.auth import (
    BindAccountRequest,
    CurrentUserResponse,
    LogoutResponse,
    SwitchRoleRequest,
    SwitchRoleResponse,
    TokenVerifyRequest,
    TokenVerifyResponse,
    UnifiedAuthResponse,
)
from app.services.auth_service import AuthService
from app.services.token_service import TokenService, TOKEN_TTL_SECONDS
from app.utils.response import AppException, success_response

logger = logging.getLogger(__name__)

# 创建路由器
router = APIRouter(prefix="/auth", tags=["统一认证"])

# Token 黑名单 Key 前缀
TOKEN_BLACKLIST_PREFIX = "token:blacklist:"


def _get_auth_service(
    redis_client: aioredis.Redis,
    db: AsyncSession = Depends(get_db),
) -> AuthService:
    """工厂函数：构造统一认证服务。

    Args:
        redis_client: Redis 客户端
        db: 数据库会话

    Returns:
        AuthService: 统一认证服务实例
    """
    return AuthService(redis_client, db)


def _get_client_info(request: Request) -> tuple:
    """获取客户端信息。

    Args:
        request: 请求对象

    Returns:
        tuple: (ip_address, user_agent)
    """
    # 获取客户端 IP
    ip_address = request.client.host if request.client else None
    # 尝试从代理获取真实 IP
    forwarded_for = request.headers.get("X-Forwarded-For")
    if forwarded_for:
        ip_address = forwarded_for.split(",")[0].strip()

    # 获取 User-Agent
    user_agent = request.headers.get("User-Agent", "")

    return ip_address, user_agent


# --------------------------------------------------------------------------
# GET /api/auth/qrcode — 获取扫码登录二维码
# --------------------------------------------------------------------------
@router.get("/qrcode", response_model=None)
async def get_qrcode(
    redis_client: aioredis.Redis = Depends(get_redis),
):
    """获取扫码登录二维码。

    无需鉴权(用户尚未登录)。
    返回 ticket + 企微 OAuth2 授权 URL，前端渲染二维码。

    Returns:
        Dict: 统一响应格式，data 字段包含 qrcode 信息
    """
    try:
        # 复用现有的扫码服务
        from app.services.qrcode_service import QrcodeService

        service = QrcodeService(redis_client)
        result = await service.create_ticket()

        return success_response(data={
            "ticket": result["ticket"],
            "qrcode_url": result["qrcode_url"],
            "qrcode_png_base64": result["qrcode_png_base64"],
            "expires_in": result["expires_in"],
            "expires_at": result["expires_at"].isoformat(),
        })

    except Exception as e:
        logger.error(f"获取扫码二维码异常: {e}", exc_info=True)
        raise AppException(1005, f"获取扫码二维码失败: {str(e)}")


# --------------------------------------------------------------------------
# GET /api/auth/scan/status — 轮询扫码状态
# --------------------------------------------------------------------------
@router.get("/scan/status", response_model=None)
async def get_scan_status(
    ticket: str = Query(..., description="扫码登录票据"),
    redis_client: aioredis.Redis = Depends(get_redis),
):
    """轮询扫码状态。

    无需鉴权(浏览器未登录态访问)。

    状态机:
      - waiting:   ticket 有效，等待扫码
      - scanned:   已扫码，等待 confirm
      - confirmed: 已确认，返回 token
      - expired:   ticket 过期/不存在

    Args:
        ticket: 扫码登录票据

    Returns:
        Dict: 统一响应格式，data 字段包含状态信息
    """
    try:
        # 复用现有的扫码服务
        from app.services.qrcode_service import QrcodeService

        service = QrcodeService(redis_client)
        result = await service.get_poll_state(ticket)

        return success_response(data={
            "status": result["status"],
            "employee_id": result.get("employee_id"),
            "name": result.get("name"),
            "token": result.get("token"),
        })

    except Exception as e:
        logger.error(f"轮询扫码状态异常: ticket={ticket[:8]}..., error={e}", exc_info=True)
        raise AppException(1005, f"轮询扫码状态失败: {str(e)}")


# --------------------------------------------------------------------------
# GET /api/auth/oauth2/url — 获取 OAuth2 授权 URL
# --------------------------------------------------------------------------
@router.get("/oauth2/url", response_model=None)
async def get_oauth2_url(
    redirect_uri: str = Query(..., description="授权成功后的回调地址"),
):
    """获取企微 OAuth2 授权 URL。

    前端在企微内打开时调用此接口，获取授权 URL 后跳转到企微授权页。
    授权成功后企微会携带 code 回调到 redirect_uri。

    Args:
        redirect_uri: 授权成功后的回调地址（三端不同：/h5/、/itadmin/、/itagent/）

    Returns:
        Dict: 统一响应格式，data 字段包含 authorize_url
    """
    import urllib.parse

    # 构建企微 OAuth2 授权 URL
    params = {
        "appid": settings.wecom_corp_id,
        "redirect_uri": redirect_uri,
        "response_type": "code",
        "scope": "snsapi_base",
        "state": "auth_login",
    }
    if getattr(settings, "wecom_agent_id", None):
        params["agentid"] = str(settings.wecom_agent_id)

    query = urllib.parse.urlencode(params)
    authorize_url = f"https://open.work.weixin.qq.com/connect/oauth2/authorize?{query}#wechat_redirect"

    logger.info(f"生成统一认证OAuth授权URL: redirect_uri={redirect_uri}")

    return success_response(data={
        "authorize_url": authorize_url,
        "redirect_uri": redirect_uri,
    })


# --------------------------------------------------------------------------
# GET /api/auth/oauth2/callback — OAuth2回调处理
# --------------------------------------------------------------------------
@router.get("/oauth2/callback", response_model=None)
async def oauth2_callback(
    request: Request,
    code: Optional[str] = Query(None, description="企微 OAuth2 授权 code"),
    state: Optional[str] = Query(None, description="防 CSRF state"),
    errcode: Optional[int] = Query(None, description="企微 OAuth 错误码"),
    errmsg: Optional[str] = Query(None, description="企微 OAuth 错误信息"),
    redis_client: aioredis.Redis = Depends(get_redis),
    db: AsyncSession = Depends(get_db),
):
    """企微 OAuth2 回调处理。

    用 code 换 userid → 查 role → 生成 token → 跳转到目标页面。
    实际上是复用现有的 auth_wecom_sso 逻辑。

    Args:
        code: 企微 OAuth2 授权 code
        state: 防 CSRF state
        errcode: 企微 OAuth 错误码
        errmsg: 企微 OAuth 错误信息

    Returns:
        RedirectResponse: 跳转到目标页面
    """
    from fastapi.responses import RedirectResponse

    # 复用 auth_wecom_sso 的逻辑
    from app.api.auth_wecom_sso import sso_callback

    # 调用现有的 SSO callback
    return await sso_callback(
        request=request,
        code=code,
        state=state,
        errcode=errcode,
        errmsg=errmsg,
        next=None,
        redis_client=redis_client,
        db=db,
    )


# --------------------------------------------------------------------------
# POST /api/auth/verify — 验证 Token
# --------------------------------------------------------------------------
@router.post("/verify", response_model=None)
async def verify_token(
    body: TokenVerifyRequest,
    redis_client: aioredis.Redis = Depends(get_redis),
):
    """验证 Token 有效性。

    Args:
        body: Token 验证请求

    Returns:
        Dict: 统一响应格式，data 字段包含验证结果
    """
    try:
        auth_service = _get_auth_service(redis_client)
        user_info = await auth_service.verify_token(body.token)

        if not user_info:
            return success_response(data=TokenVerifyResponse(
                valid=False,
            ))

        # 获取 Token 剩余有效期
        import hashlib
        token_hash = hashlib.sha256(body.token.encode()).hexdigest()
        key = f"user:token:{token_hash}"
        ttl = await redis_client.ttl(key)
        if ttl < 0:
            ttl = TOKEN_TTL_SECONDS

        return success_response(data=TokenVerifyResponse(
            valid=True,
            employee_id=user_info.get("employee_id"),
            name=user_info.get("name"),
            roles=user_info.get("roles", []),
            current_role=user_info.get("current_role"),
            login_source=user_info.get("login_source"),
            expires_in=ttl,
        ))

    except Exception as e:
        logger.error(f"验证 Token 异常: {e}", exc_info=True)
        raise AppException(1005, f"验证 Token 失败: {str(e)}")


# --------------------------------------------------------------------------
# POST /api/auth/logout — 登出
# --------------------------------------------------------------------------
@router.post("/logout", response_model=None)
async def logout(
    request: Request,
    current_user: UserInfo = Depends(get_current_user),
    redis_client: aioredis.Redis = Depends(get_redis),
):
    """登出：将 Token 加入黑名单并清除 Redis 中的 Token。

    需要鉴权：已登录用户才能登出。

    Args:
        current_user: 当前用户信息

    Returns:
        Dict: 统一响应格式
    """
    try:
        # 从请求头获取 Token
        auth_header = request.headers.get("Authorization", "")
        if auth_header.startswith("Bearer "):
            token = auth_header[7:]

            # 将 Token 加入黑名单
            import hashlib
            token_hash = hashlib.sha256(token.encode()).hexdigest()
            key = f"{TOKEN_BLACKLIST_PREFIX}{token_hash}"
            await redis_client.setex(key, TOKEN_TTL_SECONDS, "1")

            # 清除 Redis 中的 Token
            token_service = TokenService(redis_client)
            await token_service.invalidate_token(token)

            logger.info(f"用户登出: employee_id={current_user.employee_id}")

        return success_response(data=LogoutResponse(
            success=True,
            message="登出成功",
        ))

    except Exception as e:
        logger.error(f"登出异常: {e}", exc_info=True)
        raise AppException(1005, f"登出失败: {str(e)}")


# --------------------------------------------------------------------------
# GET /api/auth/me — 获取当前用户信息
# --------------------------------------------------------------------------
@router.get("/me", response_model=None)
async def get_current_user_info(
    current_user: UserInfo = Depends(get_current_user),
):
    """获取当前用户信息。

    需要鉴权：已登录用户才能调用。

    Args:
        current_user: 当前用户信息

    Returns:
        Dict: 统一响应格式，data 字段包含用户信息
    """
    return success_response(data=CurrentUserResponse(
        employee_id=current_user.employee_id,
        name=current_user.name,
        avatar=current_user.avatar,
        department=current_user.department,
        roles=current_user.roles,
        current_role=current_user.current_role,
        login_source=current_user.login_source,
    ))


# --------------------------------------------------------------------------
# POST /api/auth/switch-role — 切换角色
# --------------------------------------------------------------------------
@router.post("/switch-role", response_model=None)
async def switch_role(
    body: SwitchRoleRequest,
    current_user: UserInfo = Depends(get_current_user),
    redis_client: aioredis.Redis = Depends(get_redis),
    request: Request = None,
):
    """切换当前角色。

    需要鉴权：已登录用户才能调用。

    Args:
        body: 角色切换请求
        current_user: 当前用户信息

    Returns:
        Dict: 统一响应格式
    """
    try:
        # 从请求头获取 Token
        token = None
        auth_header = request.headers.get("Authorization", "")
        if auth_header.startswith("Bearer "):
            token = auth_header[7:]

        if not token:
            raise AppException(1001, "无法获取 Token")

        auth_service = _get_auth_service(redis_client)
        success = await auth_service.switch_role(token, body.role)

        if not success:
            raise AppException(1003, f"切换角色失败：用户没有 {body.role} 角色")

        # 获取更新后的用户信息
        user_info = await auth_service.get_current_user(token)

        logger.info(
            f"用户切换角色: employee_id={current_user.employee_id}, "
            f"new_role={body.role}"
        )

        return success_response(data=SwitchRoleResponse(
            success=True,
            current_role=body.role,
            message="角色切换成功",
        ))

    except AppException:
        raise
    except Exception as e:
        logger.error(f"切换角色异常: {e}", exc_info=True)
        raise AppException(1005, f"切换角色失败: {str(e)}")


# --------------------------------------------------------------------------
# POST /api/auth/bind — 账号绑定(互联企业)
# --------------------------------------------------------------------------
@router.post("/bind", response_model=None)
async def bind_account(
    body: BindAccountRequest,
    request: Request,
    redis_client: aioredis.Redis = Depends(get_redis),
    db: AsyncSession = Depends(get_db),
):
    """账号绑定(互联企业)。

    用于互联企业用户绑定已有账号。

    Args:
        body: 账号绑定请求（含 employee_id, corp_id 等）
        request: 请求对象（用于获取客户端信息）

    Returns:
        Dict: 统一响应格式
    """
    try:
        from sqlalchemy import select
        from app.models.employee import Employee

        # corp_id 默认使用系统配置的主企业ID
        corp_id = body.corp_id or settings.wecom_corp_id
        employee_id = body.employee_id

        # 查询员工信息
        stmt = select(Employee).where(
            Employee.corp_id == corp_id,
            Employee.employee_id == employee_id,
        )
        result = await db.execute(stmt)
        employee = result.scalar_one_or_none()

        if not employee:
            raise AppException(1003, "员工信息不存在，请先通过企微认证")

        # 查询角色
        from app.models.role import Role
        from app.models.user_role import UserRole

        role_stmt = (
            select(Role)
            .join(UserRole, Role.id == UserRole.role_id)
            .where(UserRole.employee_id == employee_id)
        )
        role_result = await db.execute(role_stmt)
        roles = role_result.scalars().all()

        if not roles:
            # 没有绑定角色：跳"无权限"页
            raise AppException(1003, "该员工没有绑定角色，请联系管理员")

        # 选择最高权限角色
        role_priority = {"admin": 3, "agent": 2, "user": 1}
        best_role = max(roles, key=lambda r: role_priority.get(r.name, 0))
        role_name = best_role.name
        role_list = [r.name for r in roles]

        # 获取客户端信息
        ip_address, user_agent = _get_client_info(request)

        # 创建 Token 并记录登录日志
        auth_service = _get_auth_service(redis_client, db)
        result = await auth_service.create_token_and_login(
            employee_id=employee_id,
            name=employee.name,
            roles=role_list,
            corp_id=corp_id,
            login_method="bind",
            login_source="h5",
            department=employee.department,
            avatar=employee.avatar,
            ip_address=ip_address,
            user_agent=user_agent,
        )

        return success_response(data=UnifiedAuthResponse(**result))

    except AppException:
        raise
    except Exception as e:
        logger.error(f"账号绑定异常: {e}", exc_info=True)
        raise AppException(1005, f"账号绑定失败: {str(e)}")