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src/services/formValidation.ts

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+import type { HealthAssessmentAnswers } from './health'
+
+export function finiteNumberInRange(value: unknown, minimum: number, maximum: number, integer = false): value is number {
+  return typeof value === 'number' && Number.isFinite(value) && value >= minimum && value <= maximum && (!integer || Number.isInteger(value))
+}
+
+// Birthdays are calendar dates, not instants. Keep the displayed day unchanged
+// even when the API serializes a DateTime or the browser has a UTC offset.
+// Admin.NET returns yyyy-MM-dd HH:mm:ss; also accept date-only and ISO timestamps.
+export function ageFromBirthday(value: unknown, today = new Date()): number | undefined {
+  if (typeof value !== 'string') return undefined
+  const match = /^(\d{4})-(\d{2})-(\d{2})(?:[T ]\d{2}:\d{2}:\d{2}(?:\.\d+)?(?:Z|[+-]\d{2}:\d{2})?)?$/.exec(value)
+  if (!match) return undefined
+  const [, yearText, monthText, dayText] = match
+  const year = Number(yearText), month = Number(monthText), day = Number(dayText)
+  const birthday = new Date(year, month - 1, day)
+  if (birthday.getFullYear() !== year || birthday.getMonth() !== month - 1 || birthday.getDate() !== day) return undefined
+  const currentDay = new Date(today.getFullYear(), today.getMonth(), today.getDate())
+  if (birthday > currentDay) return undefined
+  const beforeBirthday = today.getMonth() < month - 1 || (today.getMonth() === month - 1 && today.getDate() < day)
+  return today.getFullYear() - year - (beforeBirthday ? 1 : 0)
+}
+
+const healthAnswerOptions: Record<keyof HealthAssessmentAnswers, readonly string[]> = {
+  sleepDuration: ['<6', '6-7', '7-8', '>8'],
+  fallingAsleepSpeed: ['hard', 'normal', 'fast'],
+  temperaturePreference: ['heat_fear', 'cold_fear', 'normal'],
+  nightAwakening: ['frequent', 'light', 'none'],
+  mattressPreference: ['firm', 'medium', 'soft'],
+  exerciseFrequency: ['none', '1-2', '3-5', 'daily'],
+  muscleFatigueArea: ['back_neck', 'waist_back', 'legs', 'none'],
+  activeTimeOfDay: ['morning', 'evening', 'night', 'irregular'],
+  mealRegularity: ['regular', 'skip_breakfast', 'irregular'],
+  flavorPreference: ['light', 'moderate', 'heavy'],
+  lateNightEating: ['often', 'sometimes', 'rarely'],
+  dailyWaterIntake: ['abundant', 'moderate', 'scarce']
+}
+
+export function healthAnswersComplete(answers: HealthAssessmentAnswers): boolean {
+  return (Object.keys(healthAnswerOptions) as (keyof HealthAssessmentAnswers)[])
+    .every(key => healthAnswerOptions[key].includes(answers[key]))
+}