export function getWeekdaysForLocale(localeName = 'en-GB', weekday = 'long', firstDayInWeek = 'Sunday') {
    const {format} = new Intl.DateTimeFormat(localeName, {weekday})
    const year = firstDayInWeek === 'Sunday' ? 2023 : firstDayInWeek === 'Monday' ? 2022 : 2023
    const month = firstDayInWeek === 'Sunday' ? 4 : firstDayInWeek === 'Monday' ? 1 : 4

    return [...Array(7).keys()]
        .map((day) => format(new Date(Date.UTC(year, month, day))))
}

export function getFirstDayInMonth(month = 0, year = 2025) {
    if (month === -1) {
        month = 11
        year--
    }
    if (month === 12) {
        month = 0
        year++
    }
    return new Date(year, month, 1).getDay()
}

export function getDaysInMonth(month = 0, year = 2025) {
    month++
    if (month === -1) {
        month = 11
        year--
    }
    if (month === 12) {
        month = 0
        year++
    }

    return new Date(year, month, 0).getDate()
}