116 lines
3.4 KiB
TypeScript
116 lines
3.4 KiB
TypeScript
/**
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* 卡路里计算工具
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* 基于标准 MET (Metabolic Equivalent of Task) 公式
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*/
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export interface FoodItem {
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name: string
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emoji: string
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calories: number
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unit: string
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}
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export interface FoodComparison {
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food: FoodItem
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ratio: number
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message: string
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}
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export interface CalorieCalculationConfig {
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totalReps: number
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bpm: number
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userWeight?: number // 默认 60kg
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}
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// 食物卡路里数据库
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export const FOOD_CALORIES: Record<string, FoodItem> = {
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apple: { name: '苹果', emoji: '🍎', calories: 52, unit: '个（100g）' },
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egg: { name: '鸡蛋', emoji: '🥚', calories: 70, unit: '个' },
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chocolate: { name: '巧克力', emoji: '🍫', calories: 54, unit: '块（10g）' },
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banana: { name: '香蕉', emoji: '🍌', calories: 89, unit: '根' },
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rice: { name: '米饭', emoji: '🍚', calories: 116, unit: '碗（100g）' },
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}
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/**
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* 计算卡路里消耗
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* 公式：卡路里 = MET × 体重(kg) × 时长(小时)
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*
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* @param config 计算配置
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* @returns 卡路里消耗（kcal，保留一位小数）
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*/
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export function calculateCalories(config: CalorieCalculationConfig): number {
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const MET = 3.5 // 握力环训练的标准 MET 值
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const weight = config.userWeight || 60 // 默认 60kg
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// 边界情况：无效输入
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if (config.totalReps <= 0 || config.bpm <= 0) {
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return 0
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}
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const secondsPerRep = 60 / config.bpm
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const activeTimeHours = (config.totalReps * secondsPerRep) / 3600
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const calories = MET * weight * activeTimeHours
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return Math.round(calories * 10) / 10 // 保留一位小数
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}
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/**
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* 自动匹配最接近的食物对比
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*
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* @param burnedCalories 消耗的卡路里
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* @returns 食物对比信息
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*/
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export function getFoodComparison(burnedCalories: number): FoodComparison {
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const foods = Object.values(FOOD_CALORIES)
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// 边界情况：食物数据库为空
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if (foods.length === 0) {
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throw new Error('食物数据库为空')
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}
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// 边界情况：卡路里为 0 或负数
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if (burnedCalories <= 0) {
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return {
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food: foods[0],
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ratio: 0,
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message: `暂无消耗`,
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}
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}
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// 找到卡路里最接近的食物
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const closest = foods.reduce((prev, curr) => {
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const prevDiff = Math.abs(prev.calories - burnedCalories)
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const currDiff = Math.abs(curr.calories - burnedCalories)
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return currDiff < prevDiff ? curr : prev
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})
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const ratio = burnedCalories / closest.calories
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const ratioRounded = Math.round(ratio * 100) / 100 // 保留两位小数
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// 格式化显示：ratio < 1 时显示分数形式更直观
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let displayText: string
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if (ratioRounded < 1) {
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displayText = `相当于 ${ratioRounded.toFixed(2)} 个${closest.name} ${closest.emoji}`
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} else {
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displayText = `相当于 ${ratioRounded.toFixed(2)} ${closest.unit}${closest.name} ${closest.emoji}`
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}
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return {
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food: closest,
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ratio: ratioRounded,
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message: displayText,
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}
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}
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/**
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* 格式化时长（秒 → 分:秒）
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*
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* @param seconds 秒数
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* @returns 格式化字符串（如 "3:45"）
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*/
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export function formatDuration(seconds: number): string {
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const mins = Math.floor(seconds / 60)
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const secs = seconds % 60
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return `${mins}:${secs.toString().padStart(2, '0')}`
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}
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