import {
  Controller,
  Get,
  Post,
  Put,
  Delete,
  Param,
  Body,
  Query,
  UseGuards,
  Request,
  Res,
  UseInterceptors,
  UploadedFile,
} from '@nestjs/common';
import { FileInterceptor } from '@nestjs/platform-express';
import type { Response } from 'express';
import { OccupanciesService } from './occupancies.service';
import { CheckInDto, CheckOutDto, TransferRoomDto, BatchCheckOutDto } from './dto/occupancy.dto';
import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
import { OperationLogsService } from '../operation-logs/operation-logs.service';
import { extractRequestInfo } from '../common/request-utils';
import { RequirePermission } from '../auth/decorators/permission.decorator';
import * as ExcelJS from 'exceljs';

@UseGuards(JwtAuthGuard)
@Controller('occupancies')
export class OccupanciesController {
  constructor(
    private service: OccupanciesService,
    private logService: OperationLogsService,
  ) {}

  @Get()
  @RequirePermission('occupancy:view')
  findAll(
    @Query('roomId') roomId?: string,
    @Query('studentId') studentId?: string,
    @Query('active') active?: string,
  ) {
    return this.service.findAll({
      roomId: roomId ? +roomId : undefined,
      studentId: studentId ? +studentId : undefined,
      active: active === 'true',
    });
  }

  @Post('batch-check-out')
  @RequirePermission('occupancy:checkout')
  async batchCheckOut(@Body() dto: BatchCheckOutDto, @Request() req: any) {
    const { ipAddress, userAgent } = extractRequestInfo(req);
    const result = await this.service.batchCheckOut(dto);
    await this.logService.log({
      userId: req.user?.id,
      username: req.user?.username,
      module: '入住管理',
      action: '批量退宿',
      detail: `退宿 ${dto.ids.length} 人，日期 ${dto.checkOutDate}`,
      ipAddress,
      userAgent,
    });
    return result;
  }

  @Post('check-in')
  @RequirePermission('occupancy:checkin')
  async checkIn(@Body() dto: CheckInDto, @Request() req: any) {
    const { ipAddress, userAgent } = extractRequestInfo(req);
    const result = await this.service.checkIn(dto);
    await this.logService.log({
      userId: req.user?.id,
      username: req.user?.username,
      module: '入住管理',
      action: '办理入住',
      targetId: result.id,
      targetType: 'occupancy',
      detail: `学生${dto.studentId} 入住房间${dto.roomId}`,
      ipAddress,
      userAgent,
    });
    return result;
  }

  @Put(':id/check-out')
  @RequirePermission('occupancy:checkout')
  async checkOut(@Param('id') id: string, @Body() dto: CheckOutDto, @Request() req: any) {
    const { ipAddress, userAgent } = extractRequestInfo(req);
    const result = await this.service.checkOut(+id, dto);
    await this.logService.log({
      userId: req.user?.id,
      username: req.user?.username,
      module: '入住管理',
      action: '办理退宿',
      targetId: +id,
      targetType: 'occupancy',
      ipAddress,
      userAgent,
    });
    return result;
  }

  @Put(':id/transfer')
  @RequirePermission('occupancy:transfer')
  async transferRoom(@Param('id') id: string, @Body() dto: TransferRoomDto, @Request() req: any) {
    const { ipAddress, userAgent } = extractRequestInfo(req);
    const result = await this.service.transferRoom(+id, dto);
    await this.logService.log({
      userId: req.user?.id,
      username: req.user?.username,
      module: '入住管理',
      action: '调换宿舍',
      targetId: +id,
      targetType: 'occupancy',
      detail: `换到房间${dto.newRoomId}`,
      ipAddress,
      userAgent,
    });
    return result;
  }

  @Delete(':id')
  @RequirePermission('occupancy:view')
  async remove(@Param('id') id: string, @Request() req: any) {
    const { ipAddress, userAgent } = extractRequestInfo(req);
    const result = await this.service.remove(+id);
    await this.logService.log({
      userId: req.user?.id,
      username: req.user?.username,
      module: '入住管理',
      action: '删除入住记录',
      targetId: +id,
      targetType: 'occupancy',
      ipAddress,
      userAgent,
    });
    return result;
  }

  @Post('batch-delete')
  @RequirePermission('occupancy:view')
  async batchRemove(@Body() body: { ids: number[] }, @Request() req: any) {
    const { ipAddress, userAgent } = extractRequestInfo(req);
    const result = await this.service.batchRemove(body.ids || []);
    await this.logService.log({
      userId: req.user?.id,
      username: req.user?.username,
      module: '入住管理',
      action: '批量删除入住记录',
      detail: `IDs: ${(body.ids || []).join(',')}`,
      ipAddress,
      userAgent,
    });
    return result;
  }

  @Get('export')
  @RequirePermission('occupancy:view')
  async exportExcel(@Query('active') active?: string, @Res() res?: Response) {
    const records = await this.service.findAll({ active: active === 'true' });
    const workbook = new ExcelJS.Workbook();
    const ws = workbook.addWorksheet('入住记录');
    ws.columns = [
      { header: '宿舍号', key: 'roomNumber', width: 12 },
      { header: '楼栋', key: 'building', width: 12 },
      { header: '学生姓名', key: 'studentName', width: 12 },
      { header: '性别', key: 'gender', width: 8 },
      { header: '电话', key: 'phone', width: 18 },
      { header: '学号/身份证', key: 'idNumber', width: 22 },
      { header: '所属机构', key: 'organization', width: 18 },
      { header: '负责人/班主任', key: 'supervisor', width: 15 },
      { header: '入住日期', key: 'checkInDate', width: 14 },
      { header: '退宿日期', key: 'checkOutDate', width: 14 },
      { header: '计费起始', key: 'billingStartDate', width: 14 },
      { header: '计费截止', key: 'billingEndDate', width: 14 },
      { header: '退宿原因', key: 'checkOutReason', width: 12 },
    ];
    ws.getRow(1).font = { bold: true };
    ws.getRow(1).fill = { type: 'pattern', pattern: 'solid', fgColor: { argb: 'FFE0E0E0' } };
    for (const r of records) {
      ws.addRow({
        roomNumber: r.room?.roomNumber || '',
        building: r.room?.building || '',
        studentName: r.student?.name || '',
        gender: r.student?.gender || '',
        phone: r.student?.phone || '',
        idNumber: r.student?.idNumber || '',
        organization: r.student?.organization || '',
        supervisor: r.student?.supervisor || '',
        checkInDate: r.checkInDate || '',
        checkOutDate: r.checkOutDate || '',
        billingStartDate: r.billingStartDate || '',
        billingEndDate: r.billingEndDate || '',
        checkOutReason: r.checkOutReason || '',
      });
    }
    res!.setHeader(
      'Content-Type',
      'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
    );
    res!.setHeader('Content-Disposition', 'attachment; filename=occupancies.xlsx');
    await workbook.xlsx.write(res!);
    res!.end();
  }

  @Get('template')
  @RequirePermission('occupancy:view')
  async downloadTemplate(@Res() res: Response) {
    const workbook = new ExcelJS.Workbook();
    const ws = workbook.addWorksheet('入住名单导入模板');
    ws.columns = [
      { header: '宿舍号', key: 'roomNumber', width: 12 },
      { header: '床位号', key: 'bedNumber', width: 8 },
      { header: '姓名', key: 'name', width: 12 },
      { header: '性别', key: 'gender', width: 8 },
      { header: '民族', key: 'ethnicity', width: 10 },
      { header: '电话', key: 'phone', width: 15 },
      { header: '学号/身份证', key: 'idNumber', width: 22 },
      { header: '入住时间', key: 'checkInDate', width: 14 },
      { header: '离宿时间', key: 'checkOutDate', width: 14 },
      { header: '紧急联系人', key: 'emergencyContact', width: 15 },
      { header: '紧急联系人电话', key: 'emergencyPhone', width: 18 },
      { header: '所属机构', key: 'organization', width: 18 },
      { header: '负责人/班主任', key: 'supervisor', width: 15 },
    ];
    ws.getRow(1).font = { bold: true };
    ws.getRow(1).fill = { type: 'pattern', pattern: 'solid', fgColor: { argb: 'FFE0E0E0' } };
    // 添加说明行
    ws.addRow({
      roomNumber: '4-102',
      bedNumber: 1,
      name: '张三',
      gender: '男',
      ethnicity: '汉族',
      phone: '13800138000',
      idNumber: '2024001',
      checkInDate: '2026-04-21',
      checkOutDate: '',
      emergencyContact: '张父',
      emergencyPhone: '13900000000',
      organization: '',
      supervisor: '',
    });
    ws.addRow({
      roomNumber: '4-102',
      bedNumber: 2,
      name: '李四',
      gender: '男',
      ethnicity: '汉族',
      phone: '13800138001',
      idNumber: '2024002',
      checkInDate: '2026-04-21',
      checkOutDate: '',
      emergencyContact: '',
      emergencyPhone: '',
      organization: 'XXX教育科技',
      supervisor: '王老师',
    });
    // 添加使用说明sheet
    const helpWs = workbook.addWorksheet('使用说明');
    helpWs.getColumn(1).width = 60;
    helpWs.addRow(['【入住名单导入说明】']);
    helpWs.addRow(['1. 导入入住名单会自动创建不存在的学生和宿舍，无需单独导入学生或宿舍']);
    helpWs.addRow(['2. 宿舍号会智能解析楼栋、楼层和房间类型（如4-102自动识别为4号楼1层四人间）']);
    helpWs.addRow(['3. 同一宿舍号的多个学生可合并宿舍号单元格，系统会自动继承上一行的宿舍号']);
    helpWs.addRow(['4. 已存在的学生（按姓名匹配）会自动补充缺失信息（性别、民族等）']);
    helpWs.addRow(['5. 已有在住记录的学生会自动跳过，不会重复入住']);
    helpWs.addRow(['6. 填了离宿时间的记录会直接标记为已退宿（用于导入历史数据）']);
    helpWs.addRow(['7. 性别约束：同一宿舍只能住同性别学生，首位入住者确定宿舍性别']);
    helpWs.addRow(['8. 床位号仅做标识参考，不影响入住逻辑']);
    helpWs.getRow(1).font = { bold: true, size: 14 };
    res.setHeader(
      'Content-Type',
      'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
    );
    res.setHeader('Content-Disposition', 'attachment; filename=checkin_template.xlsx');
    await workbook.xlsx.write(res);
    res.end();
  }

  @Post('import')
  @RequirePermission('occupancy:checkin')
  @UseInterceptors(FileInterceptor('file'))
  async importCheckIn(
    @UploadedFile() file: Express.Multer.File,
    @Request() req: any,
    @Query('autoDeposit') autoDeposit?: string,
    @Query('depositAmount') depositAmount?: string,
  ) {
    const { ipAddress, userAgent } = extractRequestInfo(req);
    const workbook = new ExcelJS.Workbook();
    await workbook.xlsx.load(file.buffer as any);
    const ws = workbook.worksheets[0];
    const rows: any[] = [];
    let lastRoomNumber = '';

    ws.eachRow((row, idx) => {
      if (idx === 1) return; // 跳过表头

      // 宿舍号可能是合并单元格，需要继承上一行
      const roomNumberVal = row.getCell(1).value;
      const roomNumber = roomNumberVal ? String(roomNumberVal).trim() : '';
      if (roomNumber) lastRoomNumber = roomNumber;

      const name = String(row.getCell(3).value || '').trim();
      if (!name) return; // 无姓名则跳过空行

      // 解析日期
      const parseDate = (cell: any): string => {
        const val = cell.value;
        if (!val) return '';
        if (val instanceof Date) return val.toISOString().split('T')[0];
        const s = String(val).trim();
        // 处理 "YYYY/MM/DD" 或 "YYYY-MM-DD" 或 "YYYY.MM.DD"
        const m = s.match(/(\d{4})[\/\-\.](\d{1,2})[\/\-\.](\d{1,2})/);
        if (m) return `${m[1]}-${m[2].padStart(2, '0')}-${m[3].padStart(2, '0')}`;
        return s;
      };

      rows.push({
        name,
        roomNumber: lastRoomNumber,
        gender: String(row.getCell(4).value || '').trim() || undefined,
        ethnicity: String(row.getCell(5).value || '').trim() || undefined,
        phone: String(row.getCell(6).value || '').trim() || undefined,
        idNumber: String(row.getCell(7).value || '').trim() || undefined,
        checkInDate: parseDate(row.getCell(8)),
        checkOutDate: parseDate(row.getCell(9)) || undefined,
        emergencyContact: String(row.getCell(10).value || '').trim() || undefined,
        emergencyPhone: String(row.getCell(11).value || '').trim() || undefined,
        organization: String(row.getCell(12).value || '').trim() || undefined,
        supervisor: String(row.getCell(13).value || '').trim() || undefined,
      });
    });
    const result = await this.service.batchImportCheckIn(rows, {
      autoDeposit: autoDeposit === 'true',
      depositAmount: depositAmount ? +depositAmount : undefined,
    });
    await this.logService.log({
      userId: req.user?.id,
      username: req.user?.username,
      module: '入住管理',
      action: '批量导入入住',
      detail: result.message,
      ipAddress,
      userAgent,
    });
    return result;
  }
}