import { ApiPropertyOptional } from '@nestjs/swagger';
import { Transform, Type } from 'class-transformer';
import { IsBoolean, IsInt, IsOptional, IsString, Min } from 'class-validator';

/** Query for the admin registration ↔ join-URL view of a session. */
export class ListSessionRegistrationsDto {
  @ApiPropertyOptional({ default: 1 })
  @IsOptional()
  @Type(() => Number)
  @IsInt()
  @Min(1)
  page = 1;

  @ApiPropertyOptional({ default: 20 })
  @IsOptional()
  @Type(() => Number)
  @IsInt()
  @Min(1)
  limit = 20;

  @ApiPropertyOptional({ description: 'Filter by name / email / mobile' })
  @IsOptional()
  @IsString()
  search?: string;

  @ApiPropertyOptional({
    description: 'When true, return a downloadable Excel (.xlsx) export instead of JSON',
    default: false,
  })
  @IsOptional()
  @Transform(({ value }) => (value === undefined ? undefined : value === 'true' || value === true))
  @IsBoolean()
  download?: boolean;
}