import { Transform, Type } from 'class-transformer';
import { IsBoolean, IsEnum, IsIn, IsInt, IsOptional, IsString, Max, Min } from 'class-validator';
import {
  TrainCrewNationality,
  TrainCrewRole,
  TrainCrewStatus,
} from '../entities/train-crew-member.entity';

/** Sortable columns. Whitelisted: the value is interpolated into ORDER BY. */
export const TRAIN_CREW_SORT_FIELDS = [
  'firstName',
  'lastName',
  'role',
  'nationality',
  'status',
  'createdAt',
  'updatedAt',
] as const;

export class QueryTrainCrewMemberDto {
  /** Matched against first and last name. */
  @IsOptional()
  @IsString()
  search?: string;

  @IsOptional()
  @IsEnum(TrainCrewRole)
  role?: TrainCrewRole;

  @IsOptional()
  @IsEnum(TrainCrewNationality)
  nationality?: TrainCrewNationality;

  @IsOptional()
  @IsEnum(TrainCrewStatus)
  status?: TrainCrewStatus;

  @IsOptional()
  @Transform(({ value }) => (value === 'true' ? true : value === 'false' ? false : value))
  @IsBoolean()
  isActive?: boolean;

  @IsOptional()
  @Type(() => Number)
  @IsInt()
  @Min(1)
  page?: number;

  @IsOptional()
  @Type(() => Number)
  @IsInt()
  @Min(1)
  @Max(200)
  limit?: number;

  @IsOptional()
  @IsIn(TRAIN_CREW_SORT_FIELDS as unknown as string[])
  sortBy?: (typeof TRAIN_CREW_SORT_FIELDS)[number];

  @IsOptional()
  @IsIn(['ASC', 'DESC'])
  sortOrder?: 'ASC' | 'DESC';
}