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

export class PaginationDto {
  @ApiPropertyOptional({ default: 1 })
  @IsOptional()
  @Type(() => Number)
  @IsInt()
  @Min(1)
  page?: number = 1;

  @ApiPropertyOptional({ default: 20 })
  @IsOptional()
  @Type(() => Number)
  @IsInt()
  @Min(1)
  @Max(100)
  limit?: number = 20;
}

export class SortDto {
  @ApiPropertyOptional()
  @IsOptional()
  @IsString()
  sortBy?: string;

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

export class PaginatedResponseDto<T> {
  data: T[];
  meta: {
    page: number;
    limit: number;
    total: number;
    totalPages: number;
  };

  constructor(data: T[], total: number, page: number, limit: number) {
    this.data = data;
    this.meta = {
      page,
      limit,
      total,
      totalPages: Math.ceil(total / limit),
    };
  }
}