import { ApiProperty } from '@nestjs/swagger';
import { IsArray, IsBoolean, IsNotEmpty, IsOptional, IsString, IsInt, Min, Max } from 'class-validator';

/**
 * 食物营养数据DTO
 */
export class FoodNutritionDataDto {
  @ApiProperty({ description: '蛋白质含量（克）', required: false })
  @IsOptional()
  @IsInt()
  @Min(0)
  proteinGrams?: number;

  @ApiProperty({ description: '碳水化合物含量（克）', required: false })
  @IsOptional()
  @IsInt()
  @Min(0)
  carbohydrateGrams?: number;

  @ApiProperty({ description: '脂肪含量（克）', required: false })
  @IsOptional()
  @IsInt()
  @Min(0)
  fatGrams?: number;

  @ApiProperty({ description: '膳食纤维含量（克）', required: false })
  @IsOptional()
  @IsInt()
  @Min(0)
  fiberGrams?: number;
}

/**
 * 食物确认选项DTO
 */
export class FoodConfirmationOptionDto {
  @ApiProperty({ description: '食物选项唯一标识符' })
  @IsString()
  @IsNotEmpty()
  id: string;

  @ApiProperty({ description: '显示给用户的完整选项文本' })
  @IsString()
  @IsNotEmpty()
  label: string;

  @ApiProperty({ description: '食物名称' })
  @IsString()
  @IsNotEmpty()
  foodName: string;

  @ApiProperty({ description: '份量描述' })
  @IsString()
  @IsNotEmpty()
  portion: string;

  @ApiProperty({ description: '估算热量' })
  @IsInt()
  @Min(0)
  @Max(5000)
  calories: number;

  @ApiProperty({ description: '餐次类型' })
  @IsString()
  @IsNotEmpty()
  mealType: string;

  @ApiProperty({ description: '营养数据', type: FoodNutritionDataDto })
  nutritionData: FoodNutritionDataDto;
}

/**
 * 食物识别请求DTO
 */
export class FoodRecognitionRequestDto {
  @ApiProperty({ description: '图片URL数组' })
  @IsArray()
  @IsString({ each: true })
  @IsNotEmpty({ each: true })
  imageUrls: string[];
}

/**
 * 食物识别响应DTO - 总是返回数组结构
 */
export class FoodRecognitionResponseDto {
  @ApiProperty({
    description: '识别到的食物列表，即使只有一种食物也返回数组格式',
    type: [FoodConfirmationOptionDto]
  })
  @IsArray()
  items: FoodConfirmationOptionDto[];

  @ApiProperty({ description: '识别说明文字' })
  @IsString()
  analysisText: string;

  @ApiProperty({
    description: '识别置信度',
    minimum: 0,
    maximum: 100
  })
  @IsInt()
  @Min(0)
  @Max(100)
  confidence: number;

  @ApiProperty({
    description: '是否识别到食物',
    default: true
  })
  @IsBoolean()
  isFoodDetected: boolean;

  @ApiProperty({
    description: '非食物提示信息，当isFoodDetected为false时显示',
    required: false
  })
  @IsOptional()
  @IsString()
  nonFoodMessage?: string;
}

/**
 * 食物确认请求DTO
 */
export class FoodConfirmationRequestDto {
  @ApiProperty({ description: '用户选择的食物选项' })
  selectedOption: FoodConfirmationOptionDto;

  @ApiProperty({ description: '图片URL', required: false })
  @IsOptional()
  @IsString()
  imageUrl?: string;
}

/**
 * 文本食物分析请求DTO
 */
export class TextFoodAnalysisRequestDto {
  @ApiProperty({ 
    description: '用户描述的饮食文本内容',
    example: '今天早餐吃了一碗燕麦粥加香蕉'
  })
  @IsString()
  @IsNotEmpty()
  text: string;
}