import { Transform, Type } from 'class-transformer';
import { IsInt, IsOptional, IsString, Max, Min } from 'class-validator';

function emptyToUndefined(value: unknown): unknown {
  if (value === '' || value === null || value === undefined) {
    return undefined;
  }

  return value;
}

export class QueryIndicatorDto {
  @Transform(({ value }) => emptyToUndefined(value))
  @Type(() => Number)
  @IsOptional()
  @IsInt()
  @Min(1)
  page?: number = 1;

  @Transform(({ value }) => emptyToUndefined(value))
  @Type(() => Number)
  @IsOptional()
  @IsInt()
  @Min(1)
  @Max(100)
  limit?: number = 10;

  @Transform(({ value }) => {
    const result = emptyToUndefined(value);

    return typeof result === 'string' ? result.trim() : result;
  })
  @IsOptional()
  @IsString()
  search?: string;
}