import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
import { Type } from 'class-transformer';
import {
  ArrayMaxSize,
  ArrayMinSize,
  IsArray,
  IsNotEmpty,
  IsNumber,
  IsObject,
  IsOptional,
  IsString,
  Max,
  Min,
  ValidateNested,
} from 'class-validator';

/**
 * 清单条目（api-contract-v1 §5）。
 * 阶段0 决策#1：一条前端 DesignItem = 一条后端 DesignList，items 固定 1 个元素；
 * 决策#3：productIcon 不入库，由客户端按 productId 推导。
 */
export class DesignListEntryDto {
  @ApiProperty()
  @IsString()
  @IsNotEmpty()
  productId!: string;

  @ApiProperty()
  @IsString()
  @IsNotEmpty()
  productName!: string;

  @ApiProperty()
  @IsNumber()
  @Min(0)
  unitPrice!: number;

  @ApiProperty()
  @IsNumber()
  @Min(1)
  @Max(999)
  count!: number;

  /** 结构白名单与大小校验在 service 层做（设计数据契约 v1） */
  @ApiPropertyOptional()
  @IsOptional()
  @IsObject()
  designData?: Record<string, unknown>;
}

export class CreateDesignListDto {
  @ApiProperty({ description: '清单标题；前端传 productName（阶段0 决策#4）' })
  @IsString()
  @IsNotEmpty()
  title!: string;

  @ApiProperty({ type: [DesignListEntryDto] })
  @IsArray()
  @ArrayMinSize(1)
  @ArrayMaxSize(1)
  @ValidateNested({ each: true })
  @Type(() => DesignListEntryDto)
  items!: DesignListEntryDto[];
}