fix: move date logic to its own file with tests

app/[lang]/(live)/(public)/hotelreservation/(standard)/select-rate/getValidDates.ts

@@ -0,0 +1,55 @@
+import { Dayjs } from "dayjs"
+
+import { dt } from "@/lib/dt"
+
+/**
+ * Get valid dates from stringFromDate and stringToDate making sure that they are not in the past and chronologically correct
+ * @example const { fromDate, toDate} = getValidDates("2021-01-01", "2021-01-02")
+ */
+export function getValidDates(
+  stringFromDate: string | undefined,
+  stringToDate: string | undefined
+): { fromDate: Dayjs; toDate: Dayjs } {
+  const fromDate = getValidFromDate(stringFromDate)
+  const toDate = getValidToDate(stringToDate, fromDate)
+
+  return { fromDate, toDate }
+}
+
+/**
+ * Get valid fromDate from stringFromDate making sure that it is not in the past
+ */
+export function getValidFromDate(stringFromDate: string | undefined): Dayjs {
+  const now = dt().utc()
+  if (!stringFromDate) {
+    return now
+  }
+  const toDate = dt(stringFromDate)
+
+  const yesterday = now.subtract(1, "day")
+  if (!toDate.isAfter(yesterday)) {
+    return now
+  }
+
+  return toDate
+}
+
+/**
+ * Get valid toDate from stringToDate making sure that it is after fromDate
+ */
+export function getValidToDate(
+  stringToDate: string | undefined,
+  fromDate: Dayjs | Date
+): Dayjs {
+  const tomorrow = dt().utc().add(1, "day")
+  if (!stringToDate) {
+    return tomorrow
+  }
+
+  const toDate = dt(stringToDate)
+  if (toDate.isAfter(fromDate)) {
+    return toDate
+  }
+
+  return tomorrow
+}