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enum DayKind {\n  Weekday,\n  Weekend,\n  NewYearsDay,\n  MaundyThursday,\n  GoodFriday,\n  EasterSunday,\n  EasterMonday,\n  MayFirst,\n  GreatPrayerDay,\n  AscensionDay,\n  PentecostSunday,\n  PentecostMonday,\n  ConstitutionDay,\n  ChristmasEve,\n  ChristmasDay,\n  SecondChristmasDay,\n  NewYearsEve,\n}\n\nexport interface DayDefinition {\n  date: Date;\n  kind: DayKind;\n}\n\nexport interface CalculationResult {\n  resultingDate: Date;\n  days: DayDefinition[];\n  inputDate: Date;\n  direction: \"before\" | \"after\";\n  numberOfDays: number;\n}\n","import { addDays, isSameDay, isWeekend } from \"date-fns\";\nimport { DayDefinition, DayKind } from \"./models\";\n\nexport class HolidayCalculator {\n  constructor(private readonly extraHolidays: DayKind[] = []) {}\n\n  getDayDefinition(date: Date): DayDefinition {\n    const holidays = this.calculateHolidays(date.getFullYear());\n    const holiday = holidays.find((d) => isSameDay(d.date, date));\n\n    if (holiday) {\n      return holiday;\n    }\n\n    return {\n      date,\n      kind: isWeekend(date) ? DayKind.Weekend : DayKind.Weekday,\n    };\n  }\n\n  calculateHolidays(year: number): DayDefinition[] {\n    const easter = this.calculateEaster(year);\n    const holidays = [\n      {\n        kind: DayKind.NewYearsDay,\n        date: new Date(year, 0, 1),\n      },\n      {\n        kind: DayKind.MaundyThursday,\n        date: addDays(easter, -3),\n      },\n      {\n        kind: DayKind.GoodFriday,\n        date: addDays(easter, -2),\n      },\n      {\n        kind: DayKind.EasterSunday,\n        date: easter,\n      },\n      {\n        kind: DayKind.EasterMonday,\n        date: addDays(easter, 1),\n      },\n      {\n        kind: DayKind.GreatPrayerDay,\n        date: addDays(easter, 4 * 7 - 2),\n      },\n      {\n        kind: DayKind.AscensionDay,\n        date: addDays(easter, 6 * 7 - 3),\n      },\n      {\n        kind: DayKind.PentecostSunday,\n        date: addDays(easter, 7 * 7),\n      },\n      {\n        kind: DayKind.PentecostMonday,\n        date: addDays(easter, 7 * 7 + 1),\n      },\n      {\n        kind: DayKind.ChristmasDay,\n        date: new Date(year, 11, 25),\n      },\n      {\n        kind: DayKind.SecondChristmasDay,\n        date: new Date(year, 11, 26),\n      },\n    ];\n\n    if (this.extraHolidays.includes(DayKind.MayFirst)) {\n      holidays.push({\n        kind: DayKind.MayFirst,\n        date: new Date(year, 4, 1),\n      });\n    }\n    if (this.extraHolidays.includes(DayKind.ConstitutionDay)) {\n      holidays.push({\n        kind: DayKind.ConstitutionDay,\n        date: new Date(year, 5, 5),\n      });\n    }\n    if (this.extraHolidays.includes(DayKind.ChristmasEve)) {\n      holidays.push({\n        kind: DayKind.ChristmasEve,\n        date: new Date(year, 11, 24),\n      });\n    }\n    if (this.extraHolidays.includes(DayKind.NewYearsEve)) {\n      holidays.push({\n        kind: DayKind.NewYearsEve,\n        date: new Date(year, 11, 31),\n      });\n    }\n\n    return holidays;\n  }\n\n  private calculateEaster(year: number): Date {\n    const a = year % 19;\n    const b = Math.floor(year / 100);\n    const c = year % 100;\n    const d = Math.floor(b / 4);\n    const e = b % 4;\n    const f = Math.floor((b + 8) / 25);\n    const g = Math.floor((b - f + 1) / 3);\n    const h = (19 * a + b - d - g + 15) % 30;\n    const i = Math.floor(c / 4);\n    const k = c % 4;\n    const l = (32 + 2 * e + 2 * i - h - k) % 7;\n    const m = Math.floor((a + 11 * h + 22 * l) / 451);\n    const month = Math.floor((h + l - 7 * m + 114) / 31);\n    const dayOfMonth = ((h + l - 7 * m + 114) % 31) + 1;\n    return new Date(year, month - 1, dayOfMonth);\n  }\n}\n","import { addDays } from \"date-fns\";\nimport { HolidayCalculator } from \"./HolidayCalculator\";\nimport { CalculationResult, DayDefinition, DayKind } from \"./models\";\n\nexport class Calculator {\n  private readonly holidayCalculator: HolidayCalculator;\n\n  constructor(extraHolidays: DayKind[] = []) {\n    this.holidayCalculator = new HolidayCalculator(extraHolidays);\n  }\n\n  getBusinessDaysBefore(end: Date, numberOfDays: number) {\n    return this.getBusinessDays(end, numberOfDays, -1);\n  }\n\n  getBusinessDaysAfter(start: Date, numberOfDays: number) {\n    return this.getBusinessDays(start, numberOfDays, 1);\n  }\n\n  private getBusinessDays(\n    base: Date,\n    numberOfDays: number,\n    direction: -1 | 1\n  ): CalculationResult {\n    const days: DayDefinition[] = [];\n    let currentDate = base;\n    let numberOfDaysReached = 0;\n\n    while (true) {\n      const day = this.holidayCalculator.getDayDefinition(currentDate);\n      days.push(day);\n\n      if (day.kind === DayKind.Weekday) {\n        numberOfDaysReached++;\n      }\n\n      if (numberOfDaysReached === numberOfDays) {\n        break;\n      }\n\n      currentDate = addDays(currentDate, direction);\n    }\n\n    return {\n      days,\n      resultingDate: currentDate,\n      numberOfDays,\n      direction: direction === -1 ? \"before\" : \"after\",\n      inputDate: base,\n    };\n  }\n}\n","import { DayKind } from \"./models\";\n\nexport class DayKindFormatter {\n  format(kind: DayKind): string {\n    switch (kind) {\n      case DayKind.Weekday:\n        return \"Hverdag\";\n      case DayKind.Weekend:\n        return \"Weekend\";\n      case DayKind.AscensionDay:\n        return \"Kristi himmelfartsdag\";\n      case DayKind.GreatPrayerDay:\n        return \"Store bededag\";\n      case DayKind.ChristmasDay:\n        return \"1. juledag\";\n      case DayKind.SecondChristmasDay:\n        return \"2. juledag\";\n      case DayKind.ChristmasEve:\n        return \"Juleaftensdag\";\n      case DayKind.ConstitutionDay:\n        return \"Grundlovsdag\";\n      case DayKind.EasterSunday:\n        return \"Påskedag\";\n      case DayKind.EasterMonday:\n        return \"2. påskedag\";\n      case DayKind.MaundyThursday:\n        return \"Skærtorsdag\";\n      case DayKind.GoodFriday:\n        return \"Langfredag\";\n      case DayKind.MayFirst:\n        return \"1. maj\";\n      case DayKind.NewYearsDay:\n        return \"Nytårsdag\";\n      case DayKind.NewYearsEve:\n        return \"Nytårsaftensdag\";\n      case DayKind.PentecostSunday:\n        return \"Pinsedag\";\n      case DayKind.PentecostMonday:\n        return \"2. pinsedag\";\n      default:\n        return \"Ukendt\";\n    }\n  }\n}\n","import { isSameDay } from \"date-fns\";\nimport { DayKindFormatter } from \"../lib/DayKindFormatter\";\nimport { CalculationResult, DayKind } from \"../lib/models\";\n\nconst kindFormatter = new DayKindFormatter();\n\ninterface Props {\n  result: CalculationResult;\n}\n\nfunction ResultInfo({ result }: Props) {\n  const listItems = result.days.map((day) => {\n    const isHoliday =\n      day.kind !== DayKind.Weekday && day.kind !== DayKind.Weekend;\n\n    let className = \"\";\n    if (isSameDay(day.date, result.resultingDate)) {\n      className = \"fw-bold\";\n    } else if (day.kind !== DayKind.Weekday) {\n      className = \"text-danger\";\n    }\n\n    return (\n      <li key={day.date.toISOString()} className={className}>\n        {day.date.toLocaleDateString()}\n        {isHoliday ? ` (${kindFormatter.format(day.kind)})` : null}\n      </li>\n    );\n  });\n\n  return (\n    <>\n      <h2>Resultat</h2>\n      <p>\n        {result.numberOfDays} hverdage{\" \"}\n        {result.direction === \"before\" ? \"før\" : \"efter\"}{\" \"}\n        {result.inputDate.toLocaleDateString()} er{\" \"}\n        <span className=\"fw-bold\">\n          {result.resultingDate.toLocaleDateString()}\n        </span>\n      </p>\n      <ul className=\"list-unstyled\">{listItems}</ul>\n    </>\n  );\n}\n\nexport default ResultInfo;\n","import { format, startOfToday } from \"date-fns\";\nimport { useState } from \"react\";\nimport { Calculator } from \"../lib/Calculator\";\nimport { DayKindFormatter } from \"../lib/DayKindFormatter\";\nimport { CalculationResult, DayKind } from \"../lib/models\";\nimport ResultInfo from \"./ResultInfo\";\n\nconst formatter = new DayKindFormatter();\nconst optionalExtraHolidays = [\n  DayKind.MayFirst,\n  DayKind.ChristmasEve,\n  DayKind.NewYearsEve,\n];\n\nfunction App() {\n  const [inputDate, setInputDate] = useState(startOfToday());\n  const [numberOfDays, setNumberOfDays] = useState(\"10\");\n  const [mode, setMode] = useState(\"after\" as \"before\" | \"after\");\n  const [extraHolidays, setExtraHolidays] = useState([] as DayKind[]);\n  const [calculationResult, setCalculationResult] = useState(\n    null as CalculationResult | null\n  );\n\n  function toggleExtraHoliday(kind: DayKind, checked: boolean) {\n    setExtraHolidays(\n      checked\n        ? [...extraHolidays, kind]\n        : extraHolidays.filter((x) => x !== kind)\n    );\n  }\n\n  function calculate() {\n    const numberOfDaysAsNumber = parseInt(numberOfDays, 10);\n\n    if (isNaN(numberOfDaysAsNumber)) return;\n\n    const calculator = new Calculator(extraHolidays);\n    const result =\n      mode === \"after\"\n        ? calculator.getBusinessDaysAfter(inputDate, numberOfDaysAsNumber)\n        : calculator.getBusinessDaysBefore(inputDate, numberOfDaysAsNumber);\n    setCalculationResult(result);\n  }\n\n  return (\n    <div className=\"container\">\n      <h1>Hverdagstæller</h1>\n\n      <form\n        onSubmit={(e) => {\n          e.preventDefault();\n          calculate();\n        }}\n      >\n        <div className=\"mb-3\">\n          <label htmlFor=\"inputDate\" className=\"form-label\">\n            Startdato\n          </label>\n          <input\n            type=\"date\"\n            id=\"inputDate\"\n            className=\"form-control\"\n            required\n            value={format(inputDate, \"yyyy-MM-dd\")}\n            onChange={(e) => setInputDate(new Date(e.target.value))}\n          />\n        </div>\n\n        <div className=\"mb-3\">\n          <label htmlFor=\"numberOfDays\" className=\"form-label\">\n            Antal hverdage\n          </label>\n          <input\n            type=\"number\"\n            id=\"numberOfDays\"\n            className=\"form-control\"\n            min=\"0\"\n            required\n            value={numberOfDays}\n            onChange={(e) => setNumberOfDays(e.target.value)}\n          />\n        </div>\n\n        <div className=\"mb-3\">\n          <div className=\"form-check\">\n            <input\n              type=\"radio\"\n              name=\"direction\"\n              id=\"directionAfter\"\n              className=\"form-check-input\"\n              value=\"after\"\n              checked={mode === \"after\"}\n              onChange={() => setMode(\"after\")}\n            />\n            <label htmlFor=\"directionAfter\" className=\"form-check-label\">\n              Efter datoen\n            </label>\n          </div>\n          <div className=\"form-check\">\n            <input\n              type=\"radio\"\n              name=\"direction\"\n              id=\"directionBefore\"\n              className=\"form-check-input\"\n              value=\"before\"\n              checked={mode === \"before\"}\n              onChange={() => setMode(\"before\")}\n            />\n            <label htmlFor=\"directionBefore\" className=\"form-check-label\">\n              Før datoen\n            </label>\n          </div>\n        </div>\n\n        <div className=\"mb-3\">\n          <label className=\"form-label\">Ekstra helligdage</label>\n          {optionalExtraHolidays.map((kind) => (\n            <div className=\"form-check\" key={kind}>\n              <input\n                type=\"checkbox\"\n                id={`extra${kind}`}\n                className=\"form-check-input\"\n                checked={extraHolidays.includes(kind)}\n                onChange={(e) => toggleExtraHoliday(kind, e.target.checked)}\n              />\n              <label htmlFor={`extra${kind}`} className=\"form-check-label\">\n                {formatter.format(kind)}\n              </label>\n            </div>\n          ))}\n        </div>\n\n        <div className=\"mb-3\">\n          <button type=\"submit\" className=\"btn btn-primary\">\n            Beregn\n          </button>\n        </div>\n      </form>\n\n      {calculationResult && <ResultInfo result={calculationResult} />}\n    </div>\n  );\n}\n\nexport default App;\n","import React from \"react\";\nimport ReactDOM from \"react-dom\";\nimport App from \"./components/App\";\n\nReactDOM.render(\n  <React.StrictMode>\n    <App />\n  </React.StrictMode>,\n  document.getElementById(\"root\")\n);\n"],"sourceRoot":""}