/*
 * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <hello@stalw.art>
 *
 * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
 */

import * as React from 'react';
import { ChevronDown, ChevronLeft, ChevronRight } from 'lucide-react';
import { DayPicker, getDefaultClassNames, type DayButton } from '@daypicker/react';

import { cn } from '@/lib/utils';
import { Button, buttonVariants } from '@/components/ui/button';

function Calendar({
  className,
  classNames,
  showOutsideDays = true,
  captionLayout = 'label',
  buttonVariant = 'ghost',
  formatters,
  components,
  ...props
}: React.ComponentProps<typeof DayPicker> & {
  buttonVariant?: React.ComponentProps<typeof Button>['variant'];
}) {
  const defaultClassNames = getDefaultClassNames();

  return (
    <DayPicker
      showOutsideDays={showOutsideDays}
      className={cn(
        'group/calendar bg-background p-3 [--cell-size:--spacing(8)] [[data-slot=popover-content]_&]:bg-transparent',
        String.raw`rtl:**:[.rdp-button\_next>svg]:rotate-180`,
        String.raw`rtl:**:[.rdp-button\_previous>svg]:rotate-180`,
        className,
      )}
      captionLayout={captionLayout}
      formatters={{
        formatMonthDropdown: (date) => date.toLocaleString('default', { month: 'short' }),
        ...formatters,
      }}
      classNames={{
        root: cn('w-fit', defaultClassNames.root),
        months: cn('relative flex flex-col gap-4 md:flex-row', defaultClassNames.months),
        month: cn('flex w-full flex-col gap-4', defaultClassNames.month),
        nav: cn('absolute inset-x-0 top-0 flex w-full items-center justify-between gap-1', defaultClassNames.nav),
        button_previous: cn(
          buttonVariants({ variant: buttonVariant }),
          'size-(--cell-size) p-0 select-none aria-disabled:opacity-50',
          defaultClassNames.button_previous,
        ),
        button_next: cn(
          buttonVariants({ variant: buttonVariant }),
          'size-(--cell-size) p-0 select-none aria-disabled:opacity-50',
          defaultClassNames.button_next,
        ),
        month_caption: cn(
          'flex h-(--cell-size) w-full items-center justify-center px-(--cell-size)',
          defaultClassNames.month_caption,
        ),
        dropdowns: cn(
          'flex h-(--cell-size) w-full items-center justify-center gap-1.5 text-sm font-medium',
          defaultClassNames.dropdowns,
        ),
        dropdown_root: cn(
          'relative rounded-md border border-input shadow-xs has-focus:border-ring has-focus:ring-[3px] has-focus:ring-ring/50',
          defaultClassNames.dropdown_root,
        ),
        dropdown: cn('absolute inset-0 bg-popover opacity-0', defaultClassNames.dropdown),
        caption_label: cn(
          'font-medium select-none',
          captionLayout === 'label'
            ? 'text-sm'
            : 'flex h-8 items-center gap-1 rounded-md pr-1 pl-2 text-sm [&>svg]:size-3.5 [&>svg]:text-muted-foreground',
          defaultClassNames.caption_label,
        ),
        month_grid: cn('w-full border-collapse', defaultClassNames.month_grid),
        weekdays: cn('flex', defaultClassNames.weekdays),
        weekday: cn(
          'flex-1 rounded-md text-[0.8rem] font-normal text-muted-foreground select-none',
          defaultClassNames.weekday,
        ),
        week: cn('mt-2 flex w-full', defaultClassNames.week),
        week_number_header: cn('w-(--cell-size) select-none', defaultClassNames.week_number_header),
        week_number: cn('text-[0.8rem] text-muted-foreground select-none', defaultClassNames.week_number),
        day: cn(
          'group/day relative aspect-square h-full w-full p-0 text-center select-none [&:last-child[data-selected=true]_button]:rounded-r-md',
          props.showWeekNumber
            ? '[&:nth-child(2)[data-selected=true]_button]:rounded-l-md'
            : '[&:first-child[data-selected=true]_button]:rounded-l-md',
          defaultClassNames.day,
        ),
        range_start: cn('rounded-l-md bg-accent', defaultClassNames.range_start),
        range_middle: cn('rounded-none', defaultClassNames.range_middle),
        range_end: cn('rounded-r-md bg-accent', defaultClassNames.range_end),
        today: cn(
          'rounded-md bg-accent text-accent-foreground data-[selected=true]:rounded-none',
          defaultClassNames.today,
        ),
        outside: cn('text-muted-foreground aria-selected:text-muted-foreground', defaultClassNames.outside),
        disabled: cn('text-muted-foreground opacity-50', defaultClassNames.disabled),
        hidden: cn('invisible', defaultClassNames.hidden),
        ...classNames,
      }}
      components={{
        Root: ({ className, rootRef, ...props }) => (
          <div data-slot="calendar" ref={rootRef} className={cn(className)} {...props} />
        ),
        Chevron: ({ className, orientation, ...props }) => {
          const Icon = orientation === 'left' ? ChevronLeft : orientation === 'right' ? ChevronRight : ChevronDown;
          return <Icon className={cn('size-4', className)} {...props} />;
        },
        DayButton: CalendarDayButton,
        WeekNumber: ({ children, ...props }) => (
          <td {...props}>
            <div className="flex size-(--cell-size) items-center justify-center text-center">{children}</div>
          </td>
        ),
        ...components,
      }}
      {...props}
    />
  );
}

function CalendarDayButton({ className, day, modifiers, ...props }: React.ComponentProps<typeof DayButton>) {
  const defaultClassNames = getDefaultClassNames();

  const ref = React.useRef<HTMLButtonElement>(null);
  React.useEffect(() => {
    if (modifiers.focused) ref.current?.focus();
  }, [modifiers.focused]);

  return (
    <Button
      ref={ref}
      variant="ghost"
      size="icon"
      data-day={day.date.toLocaleDateString()}
      data-selected-single={
        modifiers.selected && !modifiers.range_start && !modifiers.range_end && !modifiers.range_middle
      }
      data-range-start={modifiers.range_start}
      data-range-end={modifiers.range_end}
      data-range-middle={modifiers.range_middle}
      className={cn(
        'flex aspect-square size-auto w-full min-w-(--cell-size) flex-col gap-1 leading-none font-normal group-data-[focused=true]/day:relative group-data-[focused=true]/day:z-10 group-data-[focused=true]/day:border-ring group-data-[focused=true]/day:ring-[3px] group-data-[focused=true]/day:ring-ring/50 data-[range-end=true]:rounded-md data-[range-end=true]:rounded-r-md data-[range-end=true]:bg-primary data-[range-end=true]:text-primary-foreground data-[range-middle=true]:rounded-none data-[range-middle=true]:bg-accent data-[range-middle=true]:text-accent-foreground data-[range-start=true]:rounded-md data-[range-start=true]:rounded-l-md data-[range-start=true]:bg-primary data-[range-start=true]:text-primary-foreground data-[selected-single=true]:bg-primary data-[selected-single=true]:text-primary-foreground dark:hover:text-accent-foreground [&>span]:text-xs [&>span]:opacity-70',
        defaultClassNames.day,
        className,
      )}
      {...props}
    />
  );
}

export { Calendar, CalendarDayButton };