import {
  IsString,
  IsInt,
  IsArray,
  IsNumber,
  IsOptional,
  IsBoolean,
  IsDateString,
  ArrayMinSize,
  Min,
} from 'class-validator';
import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
import { Type } from 'class-transformer';

export class CreateInvoiceItemDto {
  @IsString()
  @ApiProperty({ description: 'Product ID' })
  productId!: string;

  @IsInt()
  @Min(1)
  @ApiProperty({ example: 1 })
  quantity!: number;

  @IsNumber()
  @Min(0)
  @ApiProperty({ example: 10000 })
  unitPrice: number;

  @IsOptional()
  @IsNumber()
  @Min(0)
  @ApiPropertyOptional({ example: 0 })
  discount?: number;

  @IsOptional()
  @IsString()
  @ApiPropertyOptional()
  description?: string;
}

export class CreateInvoiceDto {
  @IsString()
  @ApiProperty({ description: 'Request ID to create invoice for' })
  requestId!: string;

  @IsArray()
  @ArrayMinSize(1)
  @Type(() => CreateInvoiceItemDto)
  @ApiProperty({ type: [CreateInvoiceItemDto] })
  items!: CreateInvoiceItemDto[];

  @IsOptional()
  @IsBoolean()
  @ApiPropertyOptional({ example: false })
  enableTax?: boolean;

  @IsOptional()
  @IsDateString()
  @ApiPropertyOptional({ description: 'Approval deadline (ISO date string)' })
  approvalDeadline?: string;
}