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import {dateTime} from '@gravity-ui/date-utils';
import type {DateTime} from '@gravity-ui/date-utils';
import {useControlledState} from '@gravity-ui/uikit';
import type {ValueBase} from '../../types';
import {constrainValue, createPlaceholderValue, isWeekend, mergeDateTime} from '../../utils/dates';
import {useDefaultTimeZone} from '../../utils/useDefaultTimeZone';
import {calendarLayouts} from '../utils';
import type {
CalendarLayout,
CalendarState,
CalendarStateOptionsBase,
CalendarValueType,
SelectionMode,
} from './types';
export interface CalendarStateOptions<T = DateTime>
extends ValueBase<T | null, Exclude<T, null>>, CalendarStateOptionsBase {}
export type {CalendarState} from './types';
const defaultModes: Record<CalendarLayout, boolean> = {
days: true,
months: true,
quarters: false,
years: true,
};
export function useCalendarState<M extends SelectionMode = 'single'>(
props: CalendarStateOptions<CalendarValueType<M>> & {selectionMode?: M},
): CalendarState<M> {
const {disabled, readOnly, modes = defaultModes, selectionMode = 'single' as M} = props;
const [value, setValue] = useControlledState<DateTime | DateTime[] | null>(
props.value,
props.defaultValue ?? (selectionMode === 'single' ? null : []),
props.onUpdate as any,
);
const availableModes = calendarLayouts.filter((l) => modes[l]);
const minMode = availableModes[0] || 'days';
const [mode, setMode] = useControlledState(
props.mode,
props.defaultMode ?? minMode,
props.onUpdateMode,
);
const currentMode = mode && availableModes.includes(mode) ? mode : minMode;
const firstValue = Array.isArray(value) ? (value[0] ?? null) : value;
const inputTimeZone = useDefaultTimeZone(
firstValue || props.focusedValue || props.defaultFocusedValue,
);
const timeZone = props.timeZone || inputTimeZone;
const minValue = React.useMemo(
() => (props.minValue ? props.minValue.timeZone(timeZone) : undefined),
[timeZone, props.minValue],
);
const maxValue = React.useMemo(
() => (props.maxValue ? props.maxValue.timeZone(timeZone) : undefined),
[timeZone, props.maxValue],
);
const focusedValue = React.useMemo(() => {
if (!props.focusedValue) {
return props.focusedValue;
}
return constrainValue(props.focusedValue.timeZone(timeZone), minValue, maxValue);
}, [props.focusedValue, minValue, maxValue, timeZone]);
const defaultFocusedValue = React.useMemo(() => {
const defaultValue =
(props.defaultFocusedValue ? props.defaultFocusedValue : firstValue)?.timeZone(
timeZone,
) || createPlaceholderValue({timeZone}).startOf(minMode);
return constrainValue(defaultValue, minValue, maxValue);
}, [maxValue, minValue, props.defaultFocusedValue, timeZone, firstValue, minMode]);
const [focusedDateInner, setFocusedDate] = useControlledState(
focusedValue,
defaultFocusedValue,
(date: DateTime) => {
props.onFocusUpdate?.(date.timeZone(inputTimeZone));
},
);
const focusedDate =
focusedDateInner?.timeZone(timeZone) ??
constrainValue(createPlaceholderValue({timeZone}), minValue, maxValue);
Iif (isInvalid(focusedDate, minValue, maxValue)) {
// If the focused date was moved to an invalid value, it can't be focused, so constrain it.
setFocusedDate(constrainValue(focusedDate, minValue, maxValue));
}
function focusCell(date: DateTime) {
setFocusedDate(constrainValue(date.startOf(currentMode), minValue, maxValue));
}
const [isFocused, setFocused] = React.useState(props.autoFocus || false);
const startDate = getStartDate(focusedDate, currentMode);
const endDate = getEndDate(focusedDate, currentMode);
const finalValue =
selectionMode === 'single'
? firstValue
: Array.isArray(value)
? value
: value
? [value]
: [];
return {
disabled,
readOnly,
value: finalValue as CalendarValueType<M>,
setValue(date) {
if (!disabled && !readOnly) {
if (selectionMode === 'single') {
let newValue = Array.isArray(date) ? (date[0] ?? null) : date;
if (!newValue) {
setValue(null);
return;
}
newValue = constrainValue(newValue, minValue, maxValue);
if (firstValue) {
// If there is a date already selected, then we want to keep its time
newValue = mergeDateTime(newValue, firstValue.timeZone(timeZone));
}
if (this.isCellUnavailable(newValue)) {
return;
}
setValue(newValue.timeZone(inputTimeZone));
} else {
let dates: DateTime[] = [];
if (Array.isArray(date)) {
dates = date;
} else if (date !== null) {
dates = [date];
}
setValue(dates);
}
}
},
timeZone,
selectDate(date: DateTime, force = false) {
if (!disabled) {
if (!readOnly && (force || this.mode === minMode)) {
if (force && currentMode !== minMode) {
setMode(minMode);
}
const selectedDate = constrainValue(date.startOf(minMode), minValue, maxValue);
if (this.isCellUnavailable(selectedDate)) {
return;
}
if (selectionMode === 'single') {
this.setValue(selectedDate);
} else {
const newValue = Array.isArray(value) ? [...value] : [];
if (value && !Array.isArray(value)) {
newValue.push(value);
}
let found = false;
let index = -1;
while (
(index = newValue.findIndex((d) =>
selectedDate.isSame(d.timeZone(timeZone), currentMode),
)) !== -1
) {
found = true;
newValue.splice(index, 1);
}
if (!found) {
newValue.push(selectedDate.timeZone(inputTimeZone));
}
this.setValue(newValue);
}
} else {
this.zoomIn();
}
}
},
minValue,
maxValue,
focusedDate,
startDate,
endDate,
setFocusedDate(date: DateTime) {
focusCell(date);
setFocused(true);
},
focusNextCell() {
focusCell(focusedDate.add(1, this.mode));
},
focusPreviousCell() {
focusCell(focusedDate.subtract(1, this.mode));
},
focusNextRow() {
if (this.mode === 'days') {
focusCell(focusedDate.add(1, 'week'));
} else if (this.mode === 'quarters') {
focusCell(focusedDate.add(1, 'years'));
} else {
focusCell(focusedDate.add(3, this.mode));
}
},
focusPreviousRow() {
if (this.mode === 'days') {
focusCell(focusedDate.subtract(1, 'week'));
} else if (this.mode === 'quarters') {
focusCell(focusedDate.subtract(1, 'years'));
} else {
focusCell(focusedDate.subtract(3, this.mode));
}
},
focusNextPage(larger?: boolean) {
if (this.mode === 'days') {
focusCell(focusedDate.add({months: larger ? 12 : 1}));
} else if (this.mode === 'quarters') {
focusCell(focusedDate.add(4, 'years'));
} else {
focusCell(focusedDate.add(12, this.mode));
}
},
focusPreviousPage(larger?: boolean) {
if (this.mode === 'days') {
focusCell(focusedDate.subtract({months: larger ? 12 : 1}));
} else if (this.mode === 'quarters') {
focusCell(focusedDate.subtract(4, 'years'));
} else {
focusCell(focusedDate.subtract(12, this.mode));
}
},
focusSectionStart() {
focusCell(getStartDate(focusedDate, this.mode));
},
focusSectionEnd() {
focusCell(getEndDate(focusedDate, this.mode));
},
zoomIn() {
const nextMode = availableModes[availableModes.indexOf(this.mode) - 1];
if (nextMode) {
this.setMode(nextMode);
}
},
zoomOut() {
const nextMode = availableModes[availableModes.indexOf(this.mode) + 1];
if (nextMode) {
this.setMode(nextMode);
}
},
selectFocusedDate() {
this.selectDate(focusedDate, true);
},
isFocused,
setFocused,
isInvalid(date: DateTime) {
return isInvalid(date, this.minValue, this.maxValue, this.mode);
},
isPreviousPageInvalid() {
const prev = this.startDate.subtract(1, 'day');
return this.isInvalid(prev);
},
isNextPageInvalid() {
const next = this.endDate.endOf(this.mode).add(1, 'day');
return this.isInvalid(next);
},
isSelected(date: DateTime) {
if (!value || !firstValue || this.isCellDisabled(date)) {
return false;
}
if (selectionMode === 'single') {
return date.isSame(firstValue.timeZone(timeZone), currentMode);
}
const dates = Array.isArray(value) ? value : [value];
return dates.some((d) => date.isSame(d.timeZone(timeZone), currentMode));
},
isCellUnavailable(date: DateTime) {
return props.isDateUnavailable ? props.isDateUnavailable(date) : false;
},
isCellFocused(date: DateTime) {
return this.isFocused && focusedDate && date.isSame(focusedDate, currentMode);
},
isCellDisabled(date: DateTime) {
return this.disabled || this.isInvalid(date);
},
isWeekend(date: DateTime) {
Iif (this.mode !== 'days') {
return false;
}
Iif (typeof props.isWeekend === 'function') {
return props.isWeekend(date);
}
return isWeekend(date);
},
isCurrent(date: DateTime) {
return dateTime({timeZone}).isSame(date, this.mode);
},
mode: currentMode,
setMode,
availableModes,
};
}
function getStartDate(date: DateTime, mode: CalendarLayout) {
Eif (mode === 'days') {
return date.startOf('month');
}
if (mode === 'months') {
return date.startOf('year');
}
if (mode === 'quarters') {
const year = Math.floor(date.year() / 4) * 4;
return date.startOf('year').set('year', year);
}
const year = Math.floor(date.year() / 12) * 12;
return date.startOf('year').set('year', year);
}
function getEndDate(date: DateTime, mode: CalendarLayout) {
Eif (mode === 'days') {
return date.endOf('month').startOf('day');
}
if (mode === 'months') {
return date.endOf('year').startOf('month');
}
const startDate = getStartDate(date, mode);
if (mode === 'quarters') {
return startDate.add(15, 'quarters');
}
return startDate.add({[mode]: 11});
}
function isInvalid(
date: DateTime,
minValue?: DateTime,
maxValue?: DateTime,
mode: CalendarLayout = 'days',
) {
const constrainedDate = constrainValue(date, minValue, maxValue);
return !constrainedDate.isSame(date, mode);
}
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