frontend/src/components/input/datepicker.vue

<template>
	<div class="datepicker">
		<BaseButton @click.stop="toggleDatePopup" class="show" :disabled="disabled || undefined">
			{{ date === null ? chooseDateLabel : formatDateShort(date) }}
		</BaseButton>

		<CustomTransition name="fade">
			<div v-if="show" class="datepicker-popup" ref="datepickerPopup">

				<BaseButton
					v-if="(new Date()).getHours() < 21"
					class="datepicker__quick-select-date"
					@click.stop="setDate('today')"
				>
					<span class="icon"><icon :icon="['far', 'calendar-alt']"/></span>
					<span class="text">
						<span>{{ $t('input.datepicker.today') }}</span>
						<span class="weekday">{{ getWeekdayFromStringInterval('today') }}</span>
					</span>
				</BaseButton>
				<BaseButton
					class="datepicker__quick-select-date"
					@click.stop="setDate('tomorrow')"
				>
					<span class="icon"><icon :icon="['far', 'sun']"/></span>
					<span class="text">
						<span>{{ $t('input.datepicker.tomorrow') }}</span>
						<span class="weekday">{{ getWeekdayFromStringInterval('tomorrow') }}</span>
					</span>
				</BaseButton>
				<BaseButton
					class="datepicker__quick-select-date"
					@click.stop="setDate('nextMonday')"
				>
					<span class="icon"><icon icon="coffee"/></span>
					<span class="text">
						<span>{{ $t('input.datepicker.nextMonday') }}</span>
						<span class="weekday">{{ getWeekdayFromStringInterval('nextMonday') }}</span>
					</span>
				</BaseButton>
				<BaseButton
					class="datepicker__quick-select-date"
					@click.stop="setDate('thisWeekend')"
				>
					<span class="icon"><icon icon="cocktail"/></span>
					<span class="text">
						<span>{{ $t('input.datepicker.thisWeekend') }}</span>
						<span class="weekday">{{ getWeekdayFromStringInterval('thisWeekend') }}</span>
					</span>
				</BaseButton>
				<BaseButton
					class="datepicker__quick-select-date"
					@click.stop="setDate('laterThisWeek')"
				>
					<span class="icon"><icon icon="chess-knight"/></span>
					<span class="text">
						<span>{{ $t('input.datepicker.laterThisWeek') }}</span>
						<span class="weekday">{{ getWeekdayFromStringInterval('laterThisWeek') }}</span>
					</span>
				</BaseButton>
				<BaseButton
					class="datepicker__quick-select-date"
					@click.stop="setDate('nextWeek')"
				>
					<span class="icon"><icon icon="forward"/></span>
					<span class="text">
						<span>{{ $t('input.datepicker.nextWeek') }}</span>
						<span class="weekday">{{ getWeekdayFromStringInterval('nextWeek') }}</span>
					</span>
				</BaseButton>

				<flat-pickr
					:config="flatPickerConfig"
					class="input"
					v-model="flatPickrDate"
				/>

				<x-button
					class="datepicker__close-button"
					:shadow="false"
					@click="close"
					v-cy="'closeDatepicker'"
				>
					{{ $t('misc.confirm') }}
				</x-button>
			</div>
		</CustomTransition>
	</div>
</template>

<script setup lang="ts">
import {ref, onMounted, onBeforeUnmount, toRef, watch, computed, type PropType} from 'vue'
import flatPickr from 'vue-flatpickr-component'
import 'flatpickr/dist/flatpickr.css'

import BaseButton from '@/components/base/BaseButton.vue'
import CustomTransition from '@/components/misc/CustomTransition.vue'

import {formatDate, formatDateShort} from '@/helpers/time/formatDate'
import {calculateDayInterval} from '@/helpers/time/calculateDayInterval'
import {calculateNearestHours} from '@/helpers/time/calculateNearestHours'
import {closeWhenClickedOutside} from '@/helpers/closeWhenClickedOutside'
import {createDateFromString} from '@/helpers/time/createDateFromString'
import {useAuthStore} from '@/stores/auth'
import {useI18n} from 'vue-i18n'

const props = defineProps({
	modelValue: {
		type: [Date, null, String] as PropType<Date | null | string>,
		validator: prop => prop instanceof Date || prop === null || typeof prop === 'string',
		default: null,
	},
	chooseDateLabel: {
		type: String,
		default() {
			const {t} = useI18n({useScope: 'global'})
			return t('input.datepicker.chooseDate')
		},
	},
	disabled: {
		type: Boolean,
		default: false,
	},
})

const emit = defineEmits(['update:modelValue', 'close', 'close-on-change'])

const {t} = useI18n({useScope: 'global'})

const date = ref<Date | null>()
const show = ref(false)
const changed = ref(false)

onMounted(() => document.addEventListener('click', hideDatePopup))
onBeforeUnmount(() =>document.removeEventListener('click', hideDatePopup))

const modelValue = toRef(props, 'modelValue')
watch(
	modelValue,
	setDateValue,
	{immediate: true},
)

const authStore = useAuthStore()
const weekStart = computed(() => authStore.settings.weekStart)
const flatPickerConfig = computed(() => ({
	altFormat: t('date.altFormatLong'),
	altInput: true,
	dateFormat: 'Y-m-d H:i',
	enableTime: true,
	time_24hr: true,
	inline: true,
	locale: {
		firstDayOfWeek: weekStart.value,
	},
}))

// Since flatpickr dates are strings, we need to convert them to native date objects.
// To make that work, we need a separate variable since flatpickr does not have a change event.
const flatPickrDate = computed({
	set(newValue: string | Date | null) {
		if (newValue === null) {
			date.value = null
			return
		}

		date.value = createDateFromString(newValue)
		updateData()
	},
	get() {
		if (!date.value) {
			return ''
		}

		return formatDate(date.value, 'yyy-LL-dd H:mm')
	},
})


function setDateValue(dateString: string | Date | null) {
	if (dateString === null) {
		date.value = null
		return
	}
	date.value = createDateFromString(dateString)
}

function updateData() {
	changed.value = true
	emit('update:modelValue', date.value)
}

function toggleDatePopup() {
	if (props.disabled) {
		return
	}

	show.value = !show.value
}

const datepickerPopup = ref<HTMLElement | null>(null)
function hideDatePopup(e: MouseEvent) {
	if (show.value) {
		closeWhenClickedOutside(e, datepickerPopup.value, close)
	}
}

function close() {
	// Kind of dirty, but the timeout allows us to enter a time and click on "confirm" without
	// having to click on another input field before it is actually used.
	setTimeout(() => {
		show.value = false
		emit('close', changed.value)
		if (changed.value) {
			changed.value = false
			emit('close-on-change', changed.value)
		}
	}, 200)
}

function setDate(dateString: string) {
	if (date.value === null) {
		date.value = new Date()
	}

	const interval = calculateDayInterval(dateString)
	const newDate = new Date()
	newDate.setDate(newDate.getDate() + interval)
	newDate.setHours(calculateNearestHours(newDate))
	newDate.setMinutes(0)
	newDate.setSeconds(0)
	date.value = newDate
	flatPickrDate.value = newDate
	updateData()
}

function getWeekdayFromStringInterval(dateString: string) {
	const interval = calculateDayInterval(dateString)
	const newDate = new Date()
	newDate.setDate(newDate.getDate() + interval)
	return formatDate(newDate, 'E')
}
</script>

<style lang="scss" scoped>
.datepicker {
	input.input {
		display: none;
	}
}

.datepicker-popup {
	position: absolute;
	z-index: 99;
	width: 320px;
	background: var(--white);
	border-radius: $radius;
	box-shadow: $shadow;

	@media screen and (max-width: ($tablet)) {
		width: calc(100vw - 5rem);
	}
}

.datepicker__quick-select-date {
	display: flex;
	align-items: center;
	padding: 0 .5rem;
	width: 100%;
	height: 2.25rem;
	color: var(--text);
	transition: all $transition;

	&:first-child {
		border-radius: $radius $radius 0 0;
	}

	&:hover {
		background: var(--grey-100);
	}

	.text {
		width: 100%;
		font-size: .85rem;
		display: flex;
		justify-content: space-between;
		padding-right: .25rem;

		.weekday {
			color: var(--text-light);
			text-transform: capitalize;
		}
	}

	.icon {
		width: 2rem;
		text-align: center;
	}
}
	
.datepicker__close-button {
	margin: 1rem;
	width: calc(100% - 2rem);
}

:deep(.flatpickr-calendar) {
	margin: 0 auto 8px;
	box-shadow: none;
}
</style>