import dayjs from 'dayjs';
import type { DateType, IDayObject } from './types';
import moment from 'moment';


export const CALENDAR_FORMAT = 'YYYY-MM-DD HH:mm';
export const DATE_FORMAT = 'YYYY-MM-DD';
export const YEAR_PAGE_SIZE = 12;

export const getMonths = () => dayjs.months();

export const getMonthName = (month: number) => dayjs.months()[month];

export const getWeekdays = () => dayjs.weekdays();

export const getWeekdaysShort = () => dayjs.weekdaysShort();

export const getWeekdaysMin = (firstDayOfWeek: number) => {
  let days = dayjs.weekdaysShort();
  if (firstDayOfWeek > 0) {
    days = [
      ...days.slice(firstDayOfWeek, days.length),
      ...days.slice(0, firstDayOfWeek),
    ] as dayjs.WeekdayNames;
  }
  return days;
};

export function formatTimeWithAmPm(
  time: string | number | Date | dayjs.Dayjs | null | undefined
) {

  
  const formattedTime = dayjs(time != null? time : getFormated(new Date())).format(
    'hh:mm'
    );
  const formattedHour = dayjs(time ? time : getFormated(new Date())).format(
    'HH'
  );
  const hour = parseInt(formattedHour, 10);
  const period = hour >= 12 ? 'PM' : 'AM';
  return {
    formattedTime: formattedTime,
    period: period,
  };
  // if (hour >= 12) {
  //   return `${formattedTime} PM`;
  // } else {
  //   return `${formattedTime} AM`;
  // }
}
export function formatTime(timestamp: number | Date) {
  const formattedTime = dayjs(timestamp).format('hh:mm');
  // const formattedHour = dayjs(timestamp).format('H');
  // const hour = parseInt(formattedHour, 10);
  // const period = hour >= 12 ? 'PM' : 'AM';
  return formattedTime;
}

export function timeInNumber(timeString: string) {
  const parsedTime = dayjs(timeString, { format: 'hh:mm' });

  const hour = parsedTime.hour();
  const minutes = parsedTime.minute();
  return { hour, minutes };
}
export function getDateWithOffset(offset: number) {
  const currentDate = new Date();
  currentDate.setDate(currentDate.getDate() + offset);
  return currentDate;
}


export const swapTime = (newDateString: moment.MomentInput, currentDateToday: moment.MomentInput) => {
  const newDate = moment(newDateString);
  const currentTime = moment(currentDateToday, 'YYYY-MM-DD h:mm');
  
  // Set the time from currentTime to newDate
  newDate.set({
    hour: currentTime.get('hour'),
    minute: currentTime.get('minute'),
    second: currentTime.get('second'),
  });

  return newDate.format('YYYY-MM-DD h:mm');
};


export const getFormated = (date: DateType) =>
  dayjs(date).format(CALENDAR_FORMAT);

export const getDateMonth = (date: DateType) => dayjs(date).month();

export const getDateYear = (date: DateType) => dayjs(date).year();

export const getToday = () => dayjs().format(DATE_FORMAT);

export function areDatesOnSameDay(a: DateType, b: DateType) {
  if (!a || !b) {
    return false;
  }

  const date_a = dayjs(a).format(DATE_FORMAT);
  const date_b = dayjs(b).format(DATE_FORMAT);

  return date_a === date_b;
}

export const getFormatedDate = (date: DateType, format: string) =>
  dayjs(date).format(format);

export const getDate = (date: DateType) => dayjs(date, CALENDAR_FORMAT);

export const getYearRange = (year: number) => {
  const endYear = YEAR_PAGE_SIZE * Math.ceil(year / YEAR_PAGE_SIZE);
  let startYear = endYear === year ? endYear : endYear - YEAR_PAGE_SIZE;

  if (startYear < 0) startYear = 0;
  return Array.from({ length: YEAR_PAGE_SIZE }, (_, i) => startYear + i);
};

/**
 * Get detailed date object
 *
 * @param date Get detailed date object
 *
 * @returns parsed date object
 */
export const getParsedDate = (date: DateType) => {
  const parsedDate = dayjs(date, { format: 'YYYY-MM-DD HH:mm' });
    return {
    year: dayjs(date).year(),
    month: dayjs(date).month(),
    hour: Number(parsedDate.format('hh')),
    minute: dayjs(date).minute(),
  };
};

/**
 * Calculate month days array based on current date
 *
 * @param datetime - The current date that selected
 * @param displayFullDays
 * @param minimumDate - min selectable date
 * @param maximumDate - max selectable date
 * @param firstDayOfWeek - first day of week, number 0-6, 0 – Sunday, 6 – Saturday
 *
 * @returns days array based on current date
 */
export const getMonthDays = (
  datetime: DateType = dayjs(),
  displayFullDays: boolean,
  minimumDate: DateType,
  maximumDate: DateType,
  firstDayOfWeek: number
): IDayObject[] => {
  const date = getDate(datetime);
  const daysInMonth = date.daysInMonth();
  const prevMonthDays = date.add(-1, 'month').daysInMonth();
  const firstDay = date.date(1 - firstDayOfWeek);
  const dayOfMonth = firstDay.day() % 7;

  const prevDays = displayFullDays
    ? Array.from({ length: dayOfMonth }, (_, i) => {
        const day = i + (prevMonthDays - dayOfMonth + 1);
        const thisDay = date.add(-1, 'month').date(day);
        return generateDayObject(day, thisDay, minimumDate, maximumDate, false);
      })
    : Array(dayOfMonth).fill(null);

  const monthDaysOffset = dayOfMonth + daysInMonth;
  const nextMonthDays = displayFullDays
    ? monthDaysOffset > 35
      ? 42 - monthDaysOffset
      : 35 - monthDaysOffset
    : 0;

  const currentDays = Array.from({ length: daysInMonth }, (_, i) => {
    const day = i + 1;
    const thisDay = date.date(day);
    return generateDayObject(day, thisDay, minimumDate, maximumDate, true);
  });

  const nextDays = Array.from({ length: nextMonthDays }, (_, i) => {
    const day = i + 1;
    const thisDay = date.add(1, 'month').date(day);
    return generateDayObject(day, thisDay, minimumDate, maximumDate, false);
  });

  return [...prevDays, ...currentDays, ...nextDays];
};

/**
 * Generate day object for displaying inside day cell
 *
 * @param day - number of day
 * @param date - calculated date based on day, month, and year
 * @param minDate - min selectable date
 * @param maxDate - max selectable date
 * @param isCurrentMonth - define the day is in the current month
 *
 * @returns days object based on current date
 */
const generateDayObject = (
  day: number,
  date: dayjs.Dayjs,
  minDate: DateType,
  maxDate: DateType,
  isCurrentMonth: boolean
) => {
  let disabled = false;
  if (minDate) {
    disabled = date < getDate(minDate);
  }
  if (maxDate && !disabled) {
    disabled = date > getDate(maxDate);
  }
  return {
    text: day.toString(),
    day: day,
    date: getFormatedDate(date, DATE_FORMAT),
    disabled,
    isCurrentMonth,
  };
};