import { api, postTextStream, type TextStreamCallbacks } from '@/services/api';
import type { CreateDietRecordDto, MealType } from './dietRecords';

export interface NutritionLabelData {
  energy: number; // 能量 (kJ/千卡)
  protein: number; // 蛋白质 (g)
  fat: number; // 脂肪 (g)
  carbohydrate: number; // 碳水化合物 (g)
  sodium: number; // 钠 (mg)
  fiber?: number; // 膳食纤维 (g)
  sugar?: number; // 糖 (g)
  servingSize?: string; // 每份量
}

export interface NutritionLabelAnalysisResult {
  id: string;
  imageUri: string;
  nutritionData: NutritionLabelData;
  confidence: number;
  analyzedAt: string;
  foodName?: string; // 识别出的食物名称
  brand?: string; // 品牌
}

export interface NutritionLabelAnalysisRequest {
  imageUri: string;
}

// 新API返回的营养成分项
export interface NutritionItem {
  key: string;
  name: string;
  value: string;
  analysis: string;
}

// 新API返回的响应格式
export interface NutritionAnalysisResponse {
  success: boolean;
  data: NutritionItem[];
  message?: string; // 仅在失败时返回
}

// 新API请求参数
export interface NutritionAnalysisRequest {
  imageUrl: string;
}

/**
 * 分析营养成分表（非流式）
 */
export async function analyzeNutritionLabel(request: NutritionLabelAnalysisRequest): Promise<NutritionLabelAnalysisResult> {
  return api.post<NutritionLabelAnalysisResult>('/ai-coach/nutrition-label-analysis', request);
}

/**
 * 流式分析营养成分表
 */
export async function analyzeNutritionLabelStream(
  request: NutritionLabelAnalysisRequest,
  callbacks: TextStreamCallbacks
) {
  const body = {
    imageUri: request.imageUri,
    stream: true
  };

  return postTextStream('/ai-coach/nutrition-label-analysis', body, callbacks, { timeoutMs: 120000 });
}

/**
 * 保存成分表分析结果到饮食记录
 */
export async function saveNutritionLabelToDietRecord(
  analysisResult: NutritionLabelAnalysisResult,
  mealType: MealType
): Promise<any> {
  const dietRecordData: CreateDietRecordDto = {
    mealType,
    foodName: analysisResult.foodName || '成分表分析食物',
    foodDescription: `品牌: ${analysisResult.brand || '未知'}`,
    portionDescription: analysisResult.nutritionData.servingSize || '100g',
    estimatedCalories: analysisResult.nutritionData.energy,
    proteinGrams: analysisResult.nutritionData.protein,
    carbohydrateGrams: analysisResult.nutritionData.carbohydrate,
    fatGrams: analysisResult.nutritionData.fat,
    fiberGrams: analysisResult.nutritionData.fiber,
    sugarGrams: analysisResult.nutritionData.sugar,
    sodiumMg: analysisResult.nutritionData.sodium,
    source: 'vision',
    mealTime: new Date().toISOString(),
    imageUrl: analysisResult.imageUri,
    aiAnalysisResult: analysisResult,
  };

  return api.post('/diet-records', dietRecordData);
}

/**
 * 分析营养成分表图片（新API）
 * 需要先上传图片到COS获取URL，然后调用此接口
 */
export async function analyzeNutritionImage(request: NutritionAnalysisRequest): Promise<NutritionAnalysisResponse> {
  try {
    const response = await api.post<any>('/diet-records/analyze-nutrition-image', request);

    // 处理不同的响应格式
    if (Array.isArray(response)) {
      // 如果直接返回数组，包装成标准格式
      return {
        success: true,
        data: response as NutritionItem[]
      };
    } else if (response && typeof response === 'object') {
      // 如果是对象，检查是否已经是标准格式
      if (response.success !== undefined && response.data) {
        return response as NutritionAnalysisResponse;
      } else if (Array.isArray(response.data)) {
        // 如果有data字段且是数组，包装成标准格式
        return {
          success: true,
          data: response.data as NutritionItem[]
        };
      }
    }

    // 如果都不匹配，返回错误
    throw new Error('无法解析API返回结果');
  } catch (error) {
    console.error('[NUTRITION_ANALYSIS] API调用失败:', error);
    return {
      success: false,
      data: [],
      message: error instanceof Error ? error.message : '分析失败'
    };
  }
}