// @flow strict

import * as React from 'react';

import {usePagination} from '../../hooks/usePagination';
import {useWindowSize} from '../../hooks/useWindowSize';
import classify from '../../utils/classify';
import {range} from '../../utils/helpers';
import {Dropdown} from '../Dropdown';
import {SubTitleExtraSmall} from '../Text';

import {PaginationItem} from './PaginationItem';

import css from './Pagination.module.css';


type ClassNames = $ReadOnly<{
  wrapper?: string,
  children?: string,
  paginator?: string,
}>;
type MixedEvent = SyntheticEvent<EventTarget> | Event;
type PaginationItemType =
  | 'first'
  | 'previous'
  | 'page'
  | 'start-ellipsis'
  | 'end-ellipsis'
  | 'last'
  | 'next';

export type PaginationBaseProps = {
  currentPage?: number,
  disabled?: boolean,
  onChange?: (value?: ?number, event?: ?MixedEvent) => void,
  totalPages?: number,
  showFirstButton?: boolean,
  showLastButton?: boolean,
  hideNextButton?: boolean,
  hidePrevButton?: boolean,
  boundaryCount?: number,
  siblingCount?: number,
  style?: 'primary' | 'secondary',
  staticPaginationLabel?: string,
};

export type PaginationProps = {
  children?: React.Node,
  ...PaginationBaseProps,
  classNames?: ClassNames,
};

export type PaginationItemProps = {
  id: string,
  disabled: boolean,
  onClick: (event: SyntheticEvent<HTMLElement>) => void,
  page: ?number,
  selected: boolean,
  type: PaginationItemType,
};

const LARGE_LIST_DROPDOWN_OPTIONS = 50;

const TABLET_SCREEN_SIZE = 640;

export const Pagination: React$AbstractComponent<
  PaginationProps,
  HTMLDivElement,
> = React.forwardRef<PaginationProps, HTMLDivElement>(
  (props: PaginationProps, ref) => {
    const {width} = useWindowSize();
    const showExtraSecPaginationButtons = width > TABLET_SCREEN_SIZE;
    const {
      classNames,
      style = 'primary',
      children,
      currentPage = 1,
      totalPages = 1,
      onChange,
      showFirstButton = style !== 'primary' && showExtraSecPaginationButtons,
      showLastButton = style !== 'primary' && showExtraSecPaginationButtons,
      staticPaginationLabel,
      ...restPaginationProps
    } = props;
    const showPageSelectionDropDown =
      style !== 'primary' && showExtraSecPaginationButtons;

    const {items} = usePagination({
      style,
      showFirstButton,
      showLastButton,
      currentPage,
      totalPages,
      onChange,
      ...restPaginationProps,
    });

    const menuVirtualization = {
      enable: totalPages > LARGE_LIST_DROPDOWN_OPTIONS ? true : false,
    };

    const allPages = range(1, totalPages);
    const options =
      style !== 'secondary'
        ? []
        : allPages.map((page) => ({
          key: page.toString(),
          label: page.toString(),
        }));

    return (
      <div
        ref={ref}
        data-testid="Pagination"
        className={classify(css.wrapper, classNames?.wrapper)}
      >
        <div className={classify(css.childrenSlot, classNames?.children)}>
          {children}
        </div>
        <div className={css.paginatorSlots}>
          {style === 'secondary' && showPageSelectionDropDown && (
            <>
              <Dropdown
                size="small"
                classNames={{wrapper: css.dropdownWrapper}}
                menu={{
                  options,
                  isFluid: true,
                  classNames: {wrapper: css.menuWrapper},
                  selectedKeys: currentPage ? [currentPage.toString()] : [],
                  virtualization: menuVirtualization,
                }}
                dropdownInputText={currentPage.toString()}
                onChange={(option) => onChange?.(parseInt(option.key))}
              />
              {!!totalPages && !!currentPage && (
                <SubTitleExtraSmall
                  color="tertiary"
                  className={css.secondaryLabel}
                >
                  {staticPaginationLabel
                    ? staticPaginationLabel
                    : `of ${totalPages} ${totalPages > 1 ? 'Pages' : 'Page'}`}
                </SubTitleExtraSmall>
              )}
            </>
          )}

          <div className={classify(css.paginatorSlot, classNames?.paginator)}>
            {items?.map((item) => (
              <PaginationItem key={item.id} {...item} />
            ))}
          </div>
        </div>
      </div>
    );
  },
);