import { Request, Response } from 'express';
import { UserModel } from '../models/user';
import { QuizModel } from '../models/quiz';

export class AdminUserController {
  static async getUsers(req: Request, res: Response) {
    try {
      const page = parseInt(req.query.page as string) || 1;
      const limit = parseInt(req.query.limit as string) || 10;

      const result = await UserModel.findAll(limit, (page - 1) * limit);

      res.json({
        success: true,
        data: result.users.map((u) => ({ ...u, password: u.password ?? '' })),
        pagination: {
          page,
          limit,
          total: result.total,
          pages: Math.ceil(result.total / limit)
        }
      });
    } catch (error: any) {
      res.status(500).json({
        success: false,
        message: error.message || '获取用户列表失败'
      });
    }
  }

  static async deleteUser(req: Request, res: Response) {
    try {
      const { userId } = req.body;
      if (!userId) {
        return res.status(400).json({
          success: false,
          message: 'userId不能为空'
        });
      }

      const user = await UserModel.findById(userId);
      if (!user) {
        return res.status(404).json({
          success: false,
          message: '用户不存在'
        });
      }

      await UserModel.delete(userId);

      res.json({
        success: true,
        message: '删除成功'
      });
    } catch (error: any) {
      res.status(500).json({
        success: false,
        message: error.message || '删除用户失败'
      });
    }
  }

  static async exportUsers(req: Request, res: Response) {
    try {
      const result = await UserModel.findAll(10000, 0);
      const data = result.users.map((u) => ({
        ID: u.id,
        姓名: u.name,
        手机号: u.phone,
        密码: u.password ?? '',
        注册时间: u.createdAt
      }));

      res.json({
        success: true,
        data
      });
    } catch (error: any) {
      res.status(500).json({
        success: false,
        message: error.message || '导出用户失败'
      });
    }
  }

  static async importUsers(req: Request, res: Response) {
    try {
      const file = (req as any).file;
      if (!file) {
        return res.status(400).json({
          success: false,
          message: '请上传Excel文件'
        });
      }

      const XLSX = await import('xlsx');
      const workbook = XLSX.read(file.buffer, { type: 'buffer' });
      const sheetName = workbook.SheetNames[0];
      const worksheet = workbook.Sheets[sheetName];
      const rows = XLSX.utils.sheet_to_json(worksheet) as any[];

      const errors: string[] = [];
      let imported = 0;

      for (let i = 0; i < rows.length; i++) {
        const row = rows[i];
        try {
          const name = row['姓名'] || row['name'];
          const phone = row['手机号'] || row['phone'];
          const password = row['密码'] || row['password'] || '';

          if (!name || !phone) {
            errors.push(`第${i + 2}行：姓名或手机号缺失`);
            continue;
          }

          await UserModel.create({ name, phone, password });
          imported++;
        } catch (error: any) {
          if (error.message === '手机号已存在') {
            errors.push(`第${i + 2}行：手机号重复`);
          } else {
            errors.push(`第${i + 2}行：${error.message}`);
          }
        }
      }

      res.json({
        success: true,
        data: {
          imported,
          total: rows.length,
          errors
        }
      });
    } catch (error: any) {
      res.status(500).json({
        success: false,
        message: error.message || '导入用户失败'
      });
    }
  }

  static async getUserRecords(req: Request, res: Response) {
    try {
      const { userId } = req.params;
      const page = parseInt(req.query.page as string) || 1;
      const limit = parseInt(req.query.limit as string) || 10;

      const result = await QuizModel.findRecordsByUserId(userId, limit, (page - 1) * limit);

      res.json({
        success: true,
        data: result.records,
        pagination: {
          page,
          limit,
          total: result.total,
          pages: Math.ceil(result.total / limit)
        }
      });
    } catch (error: any) {
      res.status(500).json({
        success: false,
        message: error.message || '获取用户答题记录失败'
      });
    }
  }

  static async getRecordDetail(req: Request, res: Response) {
    try {
      const { recordId } = req.params;

      const record = await QuizModel.findRecordById(recordId);
      if (!record) {
        return res.status(404).json({
          success: false,
          message: '答题记录不存在'
        });
      }

      const answers = await QuizModel.findAnswersByRecordId(recordId);

      res.json({
        success: true,
        data: {
          record,
          answers
        }
      });
    } catch (error: any) {
      res.status(500).json({
        success: false,
        message: error.message || '获取答题记录详情失败'
      });
    }
  }
}