/**
 * UUID+密码/JWT混合认证中间件
 *
 * 1. 必须提供UUID，读取设备信息并存储到res.locals
 * 2. 验证密码或账户JWT（二选一）
 * 3. 适用于需要设备上下文的接口
 */

import { PrismaClient } from "@prisma/client";
import errors from "../utils/errors.js";
import { verifyToken as verifyAccountJWT } from "../utils/jwt.js";
import { verifyDevicePassword } from "../utils/crypto.js";

const prisma = new PrismaClient();

/**
 * UUID+密码/JWT混合认证中间件
 */
export const uuidAuth = async (req, res, next) => {
  try {
    // 1. 获取UUID（必需）
    const uuid = extractUuid(req);
    if (!uuid) {
      return next(errors.createError(400, "需要提供设备UUID"));
    }

    // 2. 查找设备并存储到locals
    const device = await prisma.device.findUnique({
      where: { uuid },
    });

    if (!device) {
      return next(errors.createError(404, "设备不存在"));
    }

    // 存储设备信息到locals
    res.locals.device = device;
    res.locals.deviceId = device.id;

    // 3. 验证密码或JWT（二选一）
    const password = extractPassword(req);
    const jwt = extractJWT(req);

    if (jwt) {
      // 验证账户JWT
      try {
        const accountPayload = await verifyAccountJWT(jwt);
        const account = await prisma.account.findUnique({
          where: { id: accountPayload.accountId },
          include: {
            devices: {
              where: { uuid },
              select: { id: true }
            }
          }
        });

        if (!account) {
          return next(errors.createError(401, "账户不存在"));
        }

        // 检查设备是否绑定到此账户
        if (account.devices.length === 0) {
          return next(errors.createError(403, "设备未绑定到此账户"));
        }

        res.locals.account = account;
        res.locals.isAccountOwner = true; // 标记为账户拥有者
        return next();
      } catch (error) {
        return next(errors.createError(401, "无效的JWT token"));
      }
    } else if (password) {
      // 验证设备密码
      if (!device.password) {
        return next(); // 如果设备未设置密码，允许无密码访问
      }

      const isValid = await verifyDevicePassword(password, device.password);
      if (!isValid) {
        return next(errors.createError(401, "密码错误"));
      }

      return next();
    } else {
      // 如果设备未设置密码，允许无密码访问
      if (!device.password) {
        return next();
      }
      return next(errors.createError(401, "需要提供密码或JWT token"));
    }
  } catch (error) {
    next(error);
  }
};

/**
 * 从请求中提取UUID
 */
function extractUuid(req) {
  return (
    req.headers["x-device-uuid"] ||
    req.query.uuid ||
    req.params.uuid ||
    req.params.deviceUuid ||
    (req.body && req.body.uuid) ||
    (req.body && req.body.deviceUuid)
  );
}

/**
 * 从请求中提取密码
 */
function extractPassword(req) {
  return (
    req.headers["x-device-password"] ||
    req.query.password ||
    req.query.currentPassword
  );
}

/**
 * 从请求中提取JWT
 */
function extractJWT(req) {
  const authHeader = req.headers.authorization;
  if (authHeader && authHeader.startsWith("Bearer ")) {
    return authHeader.substring(7);
  }
  return null;
}