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

export class QueryBlogDto {
  @ApiPropertyOptional({ description: 'Filter by author ID', example: 1 })
  @IsOptional()
  @IsNumber()
  @Type(() => Number)
  authorId?: number;

  @ApiPropertyOptional({ description: 'Filter by publication status', example: true })
  @IsOptional()
  @IsBoolean()
  @Transform(({ value }) => value === 'true')
  isPublished?: boolean;

  @ApiPropertyOptional({ description: 'Filter by language', example: 'en' })
  @IsOptional()
  @IsString()
  language?: string;

  @ApiPropertyOptional({ description: 'Search in title and content', example: 'technology' })
  @IsOptional()
  @IsString()
  search?: string;

  @ApiPropertyOptional({ description: 'Filter by tags (comma separated)', example: 'technology,programming' })
  @IsOptional()
  @IsString()
  tags?: string;

  @ApiPropertyOptional({ description: 'Page number', example: 1, default: 1 })
  @IsOptional()
  @IsNumber()
  @Min(1)
  @Type(() => Number)
  page?: number = 1;

  @ApiPropertyOptional({ description: 'Results per page', example: 10, default: 10 })
  @IsOptional()
  @IsNumber()
  @Min(1)
  @Max(100)
  @Type(() => Number)
  limit?: number = 10;

  @ApiPropertyOptional({ description: 'Sort field', example: 'createdAt', default: 'createdAt' })
  @IsOptional()
  @IsString()
  sortBy?: string = 'createdAt';

  @ApiPropertyOptional({ description: 'Sort direction', example: 'DESC', default: 'DESC' })
  @IsOptional()
  @IsString()
  sortDirection?: 'ASC' | 'DESC' = 'DESC';
}