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> {
  return api.post<NutritionAnalysisResponse>('/diet-records/analyze-nutrition-image', request);
}

/**
 * 将新API的分析结果转换为旧格式，以便与现有UI兼容
 */
export function convertNewApiResultToOldFormat(
  newResult: NutritionAnalysisResponse,
  imageUri: string
): NutritionLabelAnalysisResult | null {
  if (!newResult.success || !newResult.data || newResult.data.length === 0) {
    return null;
  }

  // 从新API结果中提取营养数据
  const nutritionData: NutritionLabelData = {
    energy: 0,
    protein: 0,
    fat: 0,
    carbohydrate: 0,
    sodium: 0,
    fiber: 0,
    sugar: 0,
  };

  // 查找各个营养素的值并转换为数字
  newResult.data.forEach(item => {
    const valueStr = item.value;
    // 提取数字部分
    const numericValue = parseFloat(valueStr.replace(/[^\d.]/g, ''));

    switch (item.key) {
      case 'energy_kcal':
        // 如果是千焦，转换为千卡 (1千焦 ≈ 0.239千卡)
        if (valueStr.includes('千焦')) {
          nutritionData.energy = Math.round(numericValue * 0.239);
        } else {
          nutritionData.energy = numericValue;
        }
        break;
      case 'protein':
        nutritionData.protein = numericValue;
        break;
      case 'fat':
        nutritionData.fat = numericValue;
        break;
      case 'carbohydrate':
        nutritionData.carbohydrate = numericValue;
        break;
      case 'sodium':
        nutritionData.sodium = numericValue;
        break;
      case 'fiber':
        nutritionData.fiber = numericValue;
        break;
      case 'sugar':
        nutritionData.sugar = numericValue;
        break;
    }
  });

  return {
    id: Date.now().toString(),
    imageUri,
    nutritionData,
    confidence: 0.9, // 新API没有提供置信度，使用默认值
    analyzedAt: new Date().toISOString(),
    foodName: '营养成分表分析',
    brand: '未知',
  };
}