c9ddb708b1
Store date_of_birth (DATE) instead of a static age integer so that age is always computed dynamically from the stored date of birth. - Migration 011: adds date_of_birth, backfills from age, drops age - AgeFromDOB helper computes current age from YYYY-MM-DD string - User model, repository SQL, and service validation updated - Flutter: User.age becomes a computed getter; profile edit screen uses a date picker bounded to [today-120y, today-10y] Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
72 lines
1.5 KiB
Go
72 lines
1.5 KiB
Go
package user
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import (
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"math"
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"time"
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)
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// Activity level multipliers (Mifflin-St Jeor).
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var activityMultiplier = map[string]float64{
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"low": 1.375,
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"moderate": 1.55,
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"high": 1.725,
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}
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// Goal adjustments in kcal.
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var goalAdjustment = map[string]float64{
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"lose": -500,
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"maintain": 0,
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"gain": 300,
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}
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// AgeFromDOB computes age in years from a "YYYY-MM-DD" string. Returns nil on error.
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func AgeFromDOB(dob *string) *int {
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if dob == nil {
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return nil
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}
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t, err := time.Parse("2006-01-02", *dob)
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if err != nil {
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return nil
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}
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now := time.Now()
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years := now.Year() - t.Year()
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if now.Month() < t.Month() || (now.Month() == t.Month() && now.Day() < t.Day()) {
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years--
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}
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return &years
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}
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// CalculateDailyCalories computes the daily calorie target using the
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// Mifflin-St Jeor equation. Returns nil if any required parameter is missing.
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func CalculateDailyCalories(heightCM *int, weightKG *float64, age *int, gender, activity, goal *string) *int {
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if heightCM == nil || weightKG == nil || age == nil || gender == nil || activity == nil || goal == nil {
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return nil
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}
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// BMR = 10 * weight(kg) + 6.25 * height(cm) - 5 * age
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bmr := 10**weightKG + 6.25*float64(*heightCM) - 5*float64(*age)
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switch *gender {
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case "male":
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bmr += 5
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case "female":
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bmr -= 161
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default:
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return nil
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}
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mult, ok := activityMultiplier[*activity]
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if !ok {
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return nil
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}
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adj, ok := goalAdjustment[*goal]
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if !ok {
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return nil
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}
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tdee := bmr * mult
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result := int(math.Round(tdee + adj))
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return &result
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}
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