import { ApiProperty } from '@nestjs/swagger';
import { IsNotEmpty, IsArray, ValidateNested, ArrayMinSize, IsInt, Min, IsString } from 'class-validator';
import { Type } from 'class-transformer';

class AddItemToCartDto {
  @ApiProperty({ description: 'Quantity of the product item', example: 1, minimum: 1 })
  @IsNotEmpty()
  @Type(() => Number)
  @IsInt()
  @Min(1)
  quantity!: number;

  @ApiProperty({ description: 'Product ID' })
  @IsNotEmpty()
  @IsString()
  variantId!: string;
}

export class BulkAddItemsToCartDto {
  @ApiProperty({
    description: 'Array of items to add to cart',
    type: [AddItemToCartDto],
    example: [
      { variantId: 'product-123', quantity: 2 },
      { variantId: 'product-456', quantity: 1 },
    ],
  })
  @IsNotEmpty()
  @IsArray()
  @ArrayMinSize(1, { message: 'At least one item is required' })
  @ValidateNested({ each: true })
  @Type(() => AddItemToCartDto)
  items!: AddItemToCartDto[];
}