Initial commit: gmTouringMiniApp project

src/domain/travel/duration-gap.ts

@@ -0,0 +1,28 @@
+import type { Duration, DurationFitStatus } from './types'
+
+const REQUESTED_DURATION_MINUTES: Record<Duration, number> = {
+  half_day: 4 * 60,
+  full_day: 8 * 60,
+}
+
+const SIGNIFICANT_GAP_RATIO = 0.25
+
+export function classifyDurationFit(requestedMinutes: number, plannedMinutes: number): DurationFitStatus {
+  if (!Number.isFinite(requestedMinutes) || requestedMinutes <= 0
+    || !Number.isFinite(plannedMinutes) || plannedMinutes <= 0) {
+    return 'fits'
+  }
+  if (plannedMinutes > requestedMinutes)
+    return 'overflow'
+  if (requestedMinutes - plannedMinutes >= requestedMinutes * SIGNIFICANT_GAP_RATIO)
+    return 'underfilled'
+  return 'fits'
+}
+
+export function hasSignificantDurationGap(duration: Duration, plannedMinutes: number): boolean {
+  if (!Number.isFinite(plannedMinutes) || plannedMinutes <= 0)
+    return false
+
+  const requestedMinutes = REQUESTED_DURATION_MINUTES[duration]
+  return Math.abs(plannedMinutes - requestedMinutes) >= requestedMinutes * SIGNIFICANT_GAP_RATIO
+}