54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
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package calc
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import "caltrack/types"
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// BMR calculates Basal Metabolic Rate using Mifflin-St Jeor equation.
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func BMR(cfg types.Config) float64 {
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weight := cfg.CurrentWeightKg
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height := float64(cfg.HeightCm)
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age := float64(cfg.Age)
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if cfg.Sex == "female" {
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return 10*weight + 6.25*height - 5*age - 161
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}
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return 10*weight + 6.25*height - 5*age + 5
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}
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// ActivityMultiplier returns the multiplier for the given activity level.
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func ActivityMultiplier(level string) float64 {
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switch level {
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case "sedentary":
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return 1.2
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case "light":
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return 1.375
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case "moderate":
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return 1.55
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case "active":
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return 1.725
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default:
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return 1.55
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}
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}
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// TDEE calculates Total Daily Energy Expenditure.
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func TDEE(cfg types.Config) float64 {
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return BMR(cfg) * ActivityMultiplier(cfg.ActivityLevel)
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}
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// DailyTarget calculates the daily calorie target accounting for desired deficit.
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func DailyTarget(cfg types.Config) int {
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tdee := TDEE(cfg)
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// 1 kg of fat ≈ 7700 kcal
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dailyDeficit := (cfg.WeeklyLossKg * 7700) / 7
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target := tdee - dailyDeficit
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if target < 1200 {
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target = 1200
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}
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return int(target)
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}
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// Deficit returns the daily calorie deficit.
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func Deficit(cfg types.Config) int {
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return int(TDEE(cfg)) - DailyTarget(cfg)
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}
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