class Extension {
  public static checkDateTime(value: any, format: "dd/MM/yyyy" | "yyyy-MM-dd"): Date | null {
    if (value == null) return null;

    let dateStr = String(value).trim();
    if (!dateStr) return null;

    const parts = dateStr.replace(/-/g, "/").split("/");
    if (parts.length !== 3) return null;

    let year = 0, month = 0, day = 0;

    switch (format) {
      case "dd/MM/yyyy":
        year = Number(parts[2]);
        month = Number(parts[1]);
        day = Number(parts[0]);
        break;

      case "yyyy-MM-dd":
        year = Number(parts[0]);
        month = Number(parts[1]);
        day = Number(parts[2]);
        break;
    }

    if (isNaN(year) || isNaN(month) || isNaN(day)) return null;

    // พ.ศ. → ค.ศ.
    if (year > 2500) year -= 543;

    // clamp month
    if (month < 1 || month > 12) month = 1;

    // clamp day
    const maxDay = new Date(year, month, 0).getDate();
    if (day < 1) day = 1;
    else if (day > maxDay) day = maxDay;

    const date = new Date(year, month - 1, day);
    return isNaN(date.getTime()) ? null : date;
  }

  public static ToThaiMonth(value: number) {
    switch (value) {
      case 1:
        return "มกราคม";
      case 2:
        return "กุมภาพันธ์";
      case 3:
        return "มีนาคม";
      case 4:
        return "เมษายน";
      case 5:
        return "พฤษภาคม";
      case 6:
        return "มิถุนายน";
      case 7:
        return "กรกฎาคม";
      case 8:
        return "สิงหาคม";
      case 9:
        return "กันยายน";
      case 10:
        return "ตุลาคม";
      case 11:
        return "พฤศจิกายน";
      case 12:
        return "ธันวาคม";
      default:
        return "";
    }
  }

  public static ToThaiShortMonth(value: number) {
    switch (value) {
      case 1:
        return "ม.ค.";
      case 2:
        return "ก.พ.";
      case 3:
        return "มี.ค.";
      case 4:
        return "เม.ย.";
      case 5:
        return "พ.ค.";
      case 6:
        return "มิ.ย.";
      case 7:
        return "ก.ค.";
      case 8:
        return "ส.ค.";
      case 9:
        return "ก.ย.";
      case 10:
        return "ต.ค.";
      case 11:
        return "พ.ย.";
      case 12:
        return "ธ.ค.";
      default:
        return "";
    }
  }

  public static ToThaiYear(value: number) {
    if (value < 2400) return value + 543;
    else return value;
  }

  public static ToCeYear(value: number) {
    if (value >= 2400) return value - 543;
    else return value;
  }

  public static ToThaiNumber(value: string) {
    let arabicNumbers = "0123456789";
    let thaiNumbers = "๐๑๒๓๔๕๖๗๘๙";
    let result = "";
    for (let digit of value) {
      let index = arabicNumbers.indexOf(digit);
      if (index >= 0) {
        result += thaiNumbers[index];
      } else {
        result += digit;
      }
    }
    return result;
  }

  public static ToThaiFullDate(value: Date) {
    let yy = value.getFullYear() < 2400 ? value.getFullYear() + 543 : value.getFullYear();
    return (
      "วันที่ " +
      value.getDate() +
      " เดือน " +
      Extension.ToThaiMonth(value.getMonth() + 1) +
      " พ.ศ. " +
      yy
    );
  }

  public static ToThaiFullDate2(value: Date) {
    let yy = value.getFullYear() < 2400 ? value.getFullYear() + 543 : value.getFullYear();
    return value.getDate() + " " + Extension.ToThaiMonth(value.getMonth() + 1) + " " + yy;
  }

  public static ToThaiFullDate3(value: Date) {
    let yy = value.getFullYear() < 2400 ? value.getFullYear() + 543 : value.getFullYear();
    return value.getDate() + " เดือน " + Extension.ToThaiMonth(value.getMonth() + 1) + " พ.ศ. " + yy;
  }

  public static sumObjectValues(array: any, propertyName: any) {
    let sum = 0;
    for (let i = 0; i < array.length; i++) {
      if (array[i][propertyName] !== undefined) {
        sum += array[i][propertyName];
      }
    }
    return sum;
  }

  public static ToThaiShortDate(value: Date) {
    let yy = value.getFullYear() < 2400 ? value.getFullYear() + 543 : value.getFullYear();
    return (
      value.getDate() +
      " " +
      Extension.ToThaiShortMonth(value.getMonth() + 1) +
      " " +
      yy.toString().slice(-2)
    );
  }

}

export default Extension;