import { Router } from "express";
const router = Router();
import { jwtAuth } from "../middleware/jwt-auth.js";
import { PrismaClient } from "@prisma/client";
import errors from "../utils/errors.js";

const prisma = new PrismaClient();

/**
 * GET /auto-auth/devices/:uuid/auth-configs
 * 获取设备的所有自动授权配置 (需要 JWT 认证，且设备必须绑定到该账户)
 */
router.get(
  "/devices/:uuid/auth-configs",
  jwtAuth,
  errors.catchAsync(async (req, res, next) => {
    const { uuid } = req.params;
    const account = res.locals.account;

    // 查找设备并验证是否属于当前账户
    const device = await prisma.device.findUnique({
      where: { uuid },
    });

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

    // 验证设备是否绑定到当前账户
    if (!device.accountId || device.accountId !== account.id) {
      return next(errors.createError(403, "该设备未绑定到您的账户"));
    }

    const autoAuths = await prisma.autoAuth.findMany({
      where: { deviceId: device.id },
      orderBy: { createdAt: 'desc' },
    });

    // 返回配置，智能处理密码显示
    const configs = autoAuths.map(auth => {
      // 检查是否是 bcrypt 哈希密码
      const isHashedPassword = auth.password && auth.password.startsWith('$2');

      return {
        id: auth.id,
        password: isHashedPassword ? null : auth.password, // 哈希密码不返回
        isLegacyHash: isHashedPassword, // 标记是否为旧的哈希密码
        deviceType: auth.deviceType,
        isReadOnly: auth.isReadOnly,
        createdAt: auth.createdAt,
        updatedAt: auth.updatedAt,
      };
    });

    return res.json({
      success: true,
      configs,
    });
  })
);

/**
 * POST /auto-auth/devices/:uuid/auth-configs
 * 创建新的自动授权配置 (需要 JWT 认证，且设备必须绑定到该账户)
 * Body: { password?: string, deviceType?: string, isReadOnly?: boolean }
 */
router.post(
  "/devices/:uuid/auth-configs",
  jwtAuth,
  errors.catchAsync(async (req, res, next) => {
    const { uuid } = req.params;
    const account = res.locals.account;
    const { password, deviceType, isReadOnly } = req.body;

    // 查找设备并验证是否属于当前账户
    const device = await prisma.device.findUnique({
      where: { uuid },
    });

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

    // 验证设备是否绑定到当前账户
    if (!device.accountId || device.accountId !== account.id) {
      return next(errors.createError(403, "该设备未绑定到您的账户"));
    }

    // 验证 deviceType 如果提供的话
    const validDeviceTypes = ['teacher', 'student', 'classroom', 'parent'];
    if (deviceType && !validDeviceTypes.includes(deviceType)) {
      return next(errors.createError(400, `设备类型必须是以下之一: ${validDeviceTypes.join(', ')}`));
    }

    // 规范化密码：空字符串视为 null
    const plainPassword = (password !== undefined && password !== '') ? password : null;

    // 查询该设备的所有自动授权配置，本地检查是否存在相同密码
    const allAuths = await prisma.autoAuth.findMany({
      where: { deviceId: device.id },
    });

    const existingAuth = allAuths.find(auth => auth.password === plainPassword);

    if (existingAuth) {
      return next(errors.createError(400, "该密码的自动授权配置已存在"));
    }

    // 创建新的自动授权配置（密码明文存储）
    const autoAuth = await prisma.autoAuth.create({
      data: {
        deviceId: device.id,
        password: plainPassword,
        deviceType: deviceType || null,
        isReadOnly: isReadOnly || false,
      },
    });

    return res.status(201).json({
      success: true,
      config: {
        id: autoAuth.id,
        password: autoAuth.password, // 返回明文密码
        deviceType: autoAuth.deviceType,
        isReadOnly: autoAuth.isReadOnly,
        createdAt: autoAuth.createdAt,
      },
    });
  })
);/**
 * PUT /auto-auth/devices/:uuid/auth-configs/:configId
 * 更新自动授权配置 (需要 JWT 认证，且设备必须绑定到该账户)
 * Body: { password?: string, deviceType?: string, isReadOnly?: boolean }
 */
router.put(
  "/devices/:uuid/auth-configs/:configId",
  jwtAuth,
  errors.catchAsync(async (req, res, next) => {
    const { uuid, configId } = req.params;
    const account = res.locals.account;
    const { password, deviceType, isReadOnly } = req.body;

    // 查找设备并验证是否属于当前账户
    const device = await prisma.device.findUnique({
      where: { uuid },
    });

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

    // 验证设备是否绑定到当前账户
    if (!device.accountId || device.accountId !== account.id) {
      return next(errors.createError(403, "该设备未绑定到您的账户"));
    }

    // 查找自动授权配置
    const autoAuth = await prisma.autoAuth.findUnique({
      where: { id: configId },
    });

    if (!autoAuth) {
      return next(errors.createError(404, "自动授权配置不存在"));
    }

    // 确保配置属于当前设备
    if (autoAuth.deviceId !== device.id) {
      return next(errors.createError(403, "无权操作此配置"));
    }

    // 验证 deviceType
    const validDeviceTypes = ['teacher', 'student', 'classroom', 'parent'];
    if (deviceType && !validDeviceTypes.includes(deviceType)) {
      return next(errors.createError(400, `设备类型必须是以下之一: ${validDeviceTypes.join(', ')}`));
    }

    // 准备更新数据
    const updateData = {};

    if (password !== undefined) {
      // 规范化密码：空字符串视为 null
      const plainPassword = (password !== '') ? password : null;

      // 查询该设备的所有配置，本地检查新密码是否与其他配置冲突
      const allAuths = await prisma.autoAuth.findMany({
        where: { deviceId: device.id },
      });

      const conflictAuth = allAuths.find(auth =>
        auth.id !== configId && auth.password === plainPassword
      );

      if (conflictAuth) {
        return next(errors.createError(400, "该密码已被其他配置使用"));
      }

      updateData.password = plainPassword;
    }

    if (deviceType !== undefined) {
      updateData.deviceType = deviceType || null;
    }

    if (isReadOnly !== undefined) {
      updateData.isReadOnly = isReadOnly;
    }

    // 更新配置
    const updatedAuth = await prisma.autoAuth.update({
      where: { id: configId },
      data: updateData,
    });

    return res.json({
      success: true,
      config: {
        id: updatedAuth.id,
        password: updatedAuth.password, // 返回明文密码
        deviceType: updatedAuth.deviceType,
        isReadOnly: updatedAuth.isReadOnly,
        updatedAt: updatedAuth.updatedAt,
      },
    });
  })
);

/**
 * DELETE /auto-auth/devices/:uuid/auth-configs/:configId
 * 删除自动授权配置 (需要 JWT 认证，且设备必须绑定到该账户)
 */
router.delete(
  "/devices/:uuid/auth-configs/:configId",
  jwtAuth,
  errors.catchAsync(async (req, res, next) => {
    const { uuid, configId } = req.params;
    const account = res.locals.account;

    // 查找设备并验证是否属于当前账户
    const device = await prisma.device.findUnique({
      where: { uuid },
    });

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

    // 验证设备是否绑定到当前账户
    if (!device.accountId || device.accountId !== account.id) {
      return next(errors.createError(403, "该设备未绑定到您的账户"));
    }

    // 查找自动授权配置
    const autoAuth = await prisma.autoAuth.findUnique({
      where: { id: configId },
    });

    if (!autoAuth) {
      return next(errors.createError(404, "自动授权配置不存在"));
    }

    // 确保配置属于当前设备
    if (autoAuth.deviceId !== device.id) {
      return next(errors.createError(403, "无权操作此配置"));
    }

    // 删除配置
    await prisma.autoAuth.delete({
      where: { id: configId },
    });

    return res.status(204).end();
  })
);

/**
 * PUT /auto-auth/devices/:uuid/namespace
 * 修改设备的 namespace (需要 JWT 认证，且设备必须绑定到该账户)
 * Body: { namespace: string }
 */
router.put(
  "/devices/:uuid/namespace",
  jwtAuth,
  errors.catchAsync(async (req, res, next) => {
    const { uuid } = req.params;
    const account = res.locals.account;
    const { namespace } = req.body;

    if (!namespace) {
      return next(errors.createError(400, "需要提供 namespace"));
    }

    // 规范化 namespace：去除首尾空格
    const trimmedNamespace = namespace.trim();

    if (!trimmedNamespace) {
      return next(errors.createError(400, "namespace 不能为空"));
    }

    // 查找设备并验证是否属于当前账户
    const device = await prisma.device.findUnique({
      where: { uuid },
    });

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

    // 验证设备是否绑定到当前账户
    if (!device.accountId || device.accountId !== account.id) {
      return next(errors.createError(403, "该设备未绑定到您的账户"));
    }

    // 检查新的 namespace 是否已被其他设备使用
    if (device.namespace !== trimmedNamespace) {
      const existingDevice = await prisma.device.findUnique({
        where: { namespace: trimmedNamespace },
      });

      if (existingDevice) {
        return next(errors.createError(409, "该 namespace 已被其他设备使用"));
      }
    }

    // 更新设备的 namespace
    const updatedDevice = await prisma.device.update({
      where: { id: device.id },
      data: { namespace: trimmedNamespace },
    });

    return res.json({
      success: true,
      device: {
        id: updatedDevice.id,
        uuid: updatedDevice.uuid,
        name: updatedDevice.name,
        namespace: updatedDevice.namespace,
        updatedAt: updatedDevice.updatedAt,
      },
    });
  })
);

export default router;