import { Controller, Delete, Get, HttpCode, HttpStatus, Param } from '@nestjs/common';
import { ApiParam, ApiProperty, ApiTags } from '@nestjs/swagger';
import { FailResult, OkResult } from '../../common/dto/result.dto';
import { MeetingService } from './meeting.service';
import { NonEmptyStringPipe } from '@/common/pipes/non-empty-string.pipe';
import { Uint32Pipe } from '@/common/pipes/uint32.pipe';
import { ApiCustomOkResponse } from '@/common/decorators/swagger.decorator';
import { StudentListResponseDto, TokenResponseDto } from './meeting.dto';
import { MeetingRedisService } from '../websocket/meeting-redis.service';

/**
 * 黑名单用户 DTO
 */
class BlacklistUserDto {
  @ApiProperty({ description: '短 UID', example: 1001 })
  shortUid?: number;

  @ApiProperty({ description: '用户名称', example: '张三' })
  userName?: string;
}

/**
 * 会议控制器
 * 处理会议相关的 API 请求
 */
@ApiTags('Meeting')
@Controller('meeting')
export class MeetingController {
  public constructor(
    private readonly meetingService: MeetingService,
    private readonly redis: MeetingRedisService
  ) {}

  /**
   * 生成声网 RTC Token
   */
  @Get('get-token/:channelName/:uid')
  @HttpCode(HttpStatus.OK)
  @ApiCustomOkResponse({
    summary: '声网 RTC Token',
    model: TokenResponseDto,
    apiDescription: '声网 RTC Token 信息',
    resDescription: '声网 RTC Token 信息包含appid',
  })
  @ApiParam({ name: 'channelName', description: '需要加入的频道名(格式: `n_课程名称`)', example: 'n_1234567890' })
  @ApiParam({ name: 'uid', description: '用户的短 UID(0~4294967295)', example: '1001' })
  public async getToken(@Param('channelName', new NonEmptyStringPipe('channelName')) channelName: string, @Param('uid', new Uint32Pipe('uid')) uid: number) {
    const result = this.meetingService.generateToken(channelName, uid);
    if (!result) {
      return new FailResult('生成 Token 失败');
    }
    return new OkResult(result);
  }

  /**
   * 查询房间黑名单（包含短 UID 和名称的数组）
   */
  @Get('blacklist/:roomId')
  @HttpCode(HttpStatus.OK)
  @ApiParam({ name: 'roomId', description: '服务端房间 ID（Socket.IO 房间名）' })
  @ApiCustomOkResponse({
    summary: '房间黑名单',
    model: [BlacklistUserDto],
    apiDescription: '房间黑名单（包含短 UID 和名称的数组）',
    resDescription: '房间黑名单（包含短 UID 和名称的数组）',
  })
  public async getBlacklist(@Param('roomId', new NonEmptyStringPipe('roomId')) roomId: string) {
    const list = await this.redis.getBlacklist(roomId);
    return new OkResult(list);
  }

  /**
   * 从房间黑名单移除指定用户 (短 UID)
   */
  @Delete('blacklist/:roomId/:shortUid')
  @HttpCode(HttpStatus.OK)
  @ApiParam({ name: 'roomId', description: '服务端房间 ID（Socket.IO 房间名）' })
  @ApiParam({ name: 'shortUid', description: '用户短 UID', example: '1001' })
  @ApiCustomOkResponse({
    summary: '从房间黑名单移除用户',
    model: Boolean,
    apiDescription: '从房间黑名单移除指定用户（短 UID）',
    resDescription: '是否成功移除用户',
  })
  public async removeFromBlacklist(
    @Param('roomId', new NonEmptyStringPipe('roomId')) roomId: string,
    @Param('shortUid', new Uint32Pipe('shortUid')) shortUid: number
  ) {
    await this.redis.removeFromBlacklist(roomId, shortUid);
    return new OkResult(true);
  }

  /**
   * 通过作业 ID 查询学生详细信息列表
   */
  @Get('students/:homeworkId')
  @HttpCode(HttpStatus.OK)
  @ApiParam({ name: 'homeworkId', description: '作业 ID', example: '1234567890' })
  @ApiCustomOkResponse({
    summary: '学生详细信息列表',
    model: StudentListResponseDto,
    apiDescription: '学生详细信息列表，包含长 ID、短 ID (可能为 null) 和姓名',
    resDescription: '学生详细信息列表',
  })
  public async getStudentDetails(@Param('homeworkId', new Uint32Pipe('homeworkId')) homeworkId: number) {
    const students = await this.meetingService.getStudentDetailsByHomeworkId(homeworkId);
    return new OkResult({
      total: students.length,
      students,
    });
  }
}