refactoring: TypeScript migration, security fixes,

client/src/components/Vacay/holidays.ts

@@ -0,0 +1,131 @@
+const BUNDESLAENDER: Record<string, string> = {
+  BW: 'Baden-Württemberg',
+  BY: 'Bayern',
+  BE: 'Berlin',
+  BB: 'Brandenburg',
+  HB: 'Bremen',
+  HH: 'Hamburg',
+  HE: 'Hessen',
+  MV: 'Mecklenburg-Vorpommern',
+  NI: 'Niedersachsen',
+  NW: 'Nordrhein-Westfalen',
+  RP: 'Rheinland-Pfalz',
+  SL: 'Saarland',
+  SN: 'Sachsen',
+  ST: 'Sachsen-Anhalt',
+  SH: 'Schleswig-Holstein',
+  TH: 'Thüringen',
+}
+
+function easterSunday(year: number): Date {
+  const a = year % 19
+  const b = Math.floor(year / 100)
+  const c = year % 100
+  const d = Math.floor(b / 4)
+  const e = b % 4
+  const f = Math.floor((b + 8) / 25)
+  const g = Math.floor((b - f + 1) / 3)
+  const h = (19 * a + b - d - g + 15) % 30
+  const i = Math.floor(c / 4)
+  const k = c % 4
+  const l = (32 + 2 * e + 2 * i - h - k) % 7
+  const m = Math.floor((a + 11 * h + 22 * l) / 451)
+  const month = Math.floor((h + l - 7 * m + 114) / 31)
+  const day = ((h + l - 7 * m + 114) % 31) + 1
+  return new Date(year, month - 1, day)
+}
+
+function addDays(date: Date, days: number): Date {
+  const d = new Date(date)
+  d.setDate(d.getDate() + days)
+  return d
+}
+
+function fmt(date: Date): string {
+  const y = date.getFullYear()
+  const m = String(date.getMonth() + 1).padStart(2, '0')
+  const d = String(date.getDate()).padStart(2, '0')
+  return `${y}-${m}-${d}`
+}
+
+export function getHolidays(year: number, bundesland: string = 'NW'): Record<string, string> {
+  const easter = easterSunday(year)
+  const holidays: Record<string, string> = {}
+
+  holidays[`${year}-01-01`] = 'Neujahr'
+  holidays[`${year}-05-01`] = 'Tag der Arbeit'
+  holidays[`${year}-10-03`] = 'Tag der Deutschen Einheit'
+  holidays[`${year}-12-25`] = '1. Weihnachtsfeiertag'
+  holidays[`${year}-12-26`] = '2. Weihnachtsfeiertag'
+
+  holidays[fmt(addDays(easter, -2))] = 'Karfreitag'
+  holidays[fmt(addDays(easter, 1))] = 'Ostermontag'
+  holidays[fmt(addDays(easter, 39))] = 'Christi Himmelfahrt'
+  holidays[fmt(addDays(easter, 50))] = 'Pfingstmontag'
+
+  const bl = bundesland.toUpperCase()
+
+  if (['BW', 'BY', 'ST'].includes(bl)) {
+    holidays[`${year}-01-06`] = 'Heilige Drei Könige'
+  }
+
+  if (['BE', 'MV'].includes(bl)) {
+    holidays[`${year}-03-08`] = 'Internationaler Frauentag'
+  }
+
+  if (['BW', 'BY', 'HE', 'NW', 'RP', 'SL'].includes(bl)) {
+    holidays[fmt(addDays(easter, 60))] = 'Fronleichnam'
+  }
+
+  if (['SL'].includes(bl)) {
+    holidays[`${year}-08-15`] = 'Mariä Himmelfahrt'
+  }
+
+  if (bl === 'TH') {
+    holidays[`${year}-09-20`] = 'Weltkindertag'
+  }
+
+  if (['BB', 'HB', 'HH', 'MV', 'NI', 'SN', 'ST', 'SH', 'TH'].includes(bl)) {
+    holidays[`${year}-10-31`] = 'Reformationstag'
+  }
+
+  if (['BW', 'BY', 'NW', 'RP', 'SL'].includes(bl)) {
+    holidays[`${year}-11-01`] = 'Allerheiligen'
+  }
+
+  if (bl === 'SN') {
+    const nov23 = new Date(year, 10, 23)
+    const bbt = new Date(nov23)
+    while (bbt.getDay() !== 3) bbt.setDate(bbt.getDate() - 1)
+    holidays[fmt(bbt)] = 'Buß- und Bettag'
+  }
+
+  return holidays
+}
+
+export function isWeekend(dateStr: string): boolean {
+  const d = new Date(dateStr + 'T00:00:00')
+  const day = d.getDay()
+  return day === 0 || day === 6
+}
+
+export function getWeekday(dateStr: string): string {
+  const d = new Date(dateStr + 'T00:00:00')
+  return ['So', 'Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa'][d.getDay()]
+}
+
+export function getWeekdayFull(dateStr: string): string {
+  const d = new Date(dateStr + 'T00:00:00')
+  return ['Sonntag', 'Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag'][d.getDay()]
+}
+
+export function daysInMonth(year: number, month: number): number {
+  return new Date(year, month, 0).getDate()
+}
+
+export function formatDate(dateStr: string): string {
+  const d = new Date(dateStr + 'T00:00:00')
+  return d.toLocaleDateString('de-DE', { weekday: 'short', day: '2-digit', month: '2-digit', year: 'numeric' })
+}
+
+export { BUNDESLAENDER }