import { ApiPropertyOptional } from '@nestjs/swagger';
import { Type } from 'class-transformer';
import {
  IsIn,
  IsInt,
  IsISO8601,
  IsOptional,
  IsString,
  Max,
  MaxLength,
  Min,
} from 'class-validator';

export const BATCH_BOARD_STATUSES = [
  'DRAFT',
  'SCHEDULED',
  'DISPATCHED',
  'ARRIVED',
  'CANCELLED',
] as const;

export const BATCH_BOARD_SORT_FIELDS = [
  'createdAt',
  'scheduledDepartureDate',
  'trainNumber',
  'status',
] as const;
export type BatchBoardSortField = (typeof BATCH_BOARD_SORT_FIELDS)[number];

/** Filters for the batch monitoring board list (import schedules, all statuses). */
export class BatchBoardQueryDto {
  @ApiPropertyOptional({ default: 1, minimum: 1 })
  @IsOptional()
  @Type(() => Number)
  @IsInt()
  @Min(1)
  page?: number;

  @ApiPropertyOptional({ default: 12, minimum: 1, maximum: 100 })
  @IsOptional()
  @Type(() => Number)
  @IsInt()
  @Min(1)
  @Max(100)
  pageSize?: number;

  @ApiPropertyOptional({
    description:
      'Comma-separated schedule statuses (DRAFT,SCHEDULED,DISPATCHED,ARRIVED,CANCELLED). Omit for all.',
    example: 'DISPATCHED,ARRIVED',
  })
  @IsOptional()
  @IsString()
  statuses?: string;

  @ApiPropertyOptional({ enum: ['OPEN', 'FULL', 'CLOSED'] })
  @IsOptional()
  @IsIn(['OPEN', 'FULL', 'CLOSED'])
  bookingWindowStatus?: 'OPEN' | 'FULL' | 'CLOSED';

  @ApiPropertyOptional({
    description:
      'Case-insensitive match on train number, route yards, stations, or locomotive code.',
  })
  @IsOptional()
  @IsString()
  @MaxLength(120)
  search?: string;

  @ApiPropertyOptional({ description: 'Departure date lower bound (ISO 8601).' })
  @IsOptional()
  @IsISO8601()
  departureFrom?: string;

  @ApiPropertyOptional({ description: 'Departure date upper bound (ISO 8601).' })
  @IsOptional()
  @IsISO8601()
  departureTo?: string;

  @ApiPropertyOptional({ description: 'Created-at lower bound (ISO 8601).' })
  @IsOptional()
  @IsISO8601()
  createdFrom?: string;

  @ApiPropertyOptional({ description: 'Created-at upper bound (ISO 8601).' })
  @IsOptional()
  @IsISO8601()
  createdTo?: string;

  @ApiPropertyOptional({ enum: BATCH_BOARD_SORT_FIELDS, default: 'createdAt' })
  @IsOptional()
  @IsIn(BATCH_BOARD_SORT_FIELDS as unknown as string[])
  sortBy?: BatchBoardSortField;

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