guild_front/src/components/Calendar/CalendarComponent.js

import React, { useState, useEffect } from 'react'
import ellipse from '../../images/ellipse.png'
import rectangle from '../../images/rectangle__calendar.png'
import calendarIcon from '../../images/calendar_icon.png'
import moment from 'moment'
import 'moment/locale/ru'
import { calendarHelper, currentMonthAndDay } from './calendarHelper'

import './calendarComponent.scss'

const CalendarComponent = () => {
  const [value, setValue] = useState(moment())
  const [calendar, setCalendar] = useState([])

  useEffect(() => {
    setCalendar(calendarHelper(value))
  }, [value])

  function beforeToday(day) {
    return day.isBefore(new Date(), 'day')
  }

  function isToday(day) {
    return day.isSame(new Date(), 'day')
  }

  function dayStyles(day) {
    if (beforeToday(day)) return `before`
    if (isToday(day)) return `today`
    if (day.day() === 6 || day.day() === 0) return `selected`
    return ''
  }

  function prevMonth() {
    return value.clone().subtract(1, 'month')
  }

  function nextMonth() {
    return value.clone().subtract(2, 'month')
  }

  const prevMonthFirst = () => {
    return moment().subtract(1, 'month').format('MMMM')
  }
  const prevMonthSecond = () => {
    return moment().subtract(2, 'month').format('MMMM')
  }

  return (
    <div className='calendar-component'>
      <div className='calendar-component__header'>
        <h3>Мои отчеты</h3>
        <div className='calendar-component__header-box'>
          <img src={ellipse} alt='' />
          <span onClick={() => setValue(prevMonth())}>{prevMonthFirst()}</span>
        </div>
        <div className='calendar-component__header-box'>
          <img src={ellipse} alt='' />
          <span onClick={() => setValue(nextMonth())}>{prevMonthSecond()}</span>
        </div>
      </div>

      <div className='calendar-component__rectangle'>
        <img src={rectangle} alt='' />
      </div>

      <div className='calendar-component__body'>
        <div>
          <p>Пн</p>
          <p>Вт</p>
          <p>Ср</p>
          <p>Чт</p>
          <p>Пт</p>
          <p>Сб</p>
          <p>Вс</p>
        </div>

        <div className='calendar-component__form'>
          {calendar.map((week) =>
            week.map((day) => (
              <button
                onClick={() => setValue(day)}
                key={day}
                className={dayStyles(day)}
                name={day.format('dddd')}
                id='btn'
              >
                <img className={'calendar__icon'} src={calendarIcon} alt='' />
                {currentMonthAndDay(day)}
              </button>
            ))
          )}
        </div>
      </div>
    </div>
  )
}

export default CalendarComponent