import * as React from 'react';
import { ToggleTemplate, ToggleTemplateProps } from './ToggleTemplate';
import styles from '@patternfly/react-styles/css/components/Pagination/pagination';
import { css } from '@patternfly/react-styles';

import { fillTemplate } from '../../helpers';
import { Navigation } from './Navigation';
import { PaginationOptionsMenu } from './PaginationOptionsMenu';
import { getOUIAProps, OUIAProps, getDefaultOUIAId } from '../../helpers';
import widthChars from '@patternfly/react-tokens/dist/esm/c_pagination__nav_page_select_c_form_control_width_chars';
import { PickOptional } from '../../helpers';

export enum PaginationVariant {
  bottom = 'bottom',
  top = 'top'
}

const defaultPerPageOptions = [
  {
    title: '10',
    value: 10
  },
  {
    title: '20',
    value: 20
  },
  {
    title: '50',
    value: 50
  },
  {
    title: '100',
    value: 100
  }
];

/** Properties to customize the content and behavior of the pagination dropdown options. These
 * properties should be passed into the pagination component's perPageOptions property.
 */

export interface PerPageOptions {
  /** The text title of the option, which is rendered inside the pagination dropdown menu. */
  title?: string;
  /** The value of the option, which determines how many items are displayed per page. */
  value?: number;
}

/** Properties to customize various pagination titles. The following properties should be
 * passed into the pagination component's title property.
 */

export interface PaginationTitles {
  /** Accessible label for the input displaying the current page. */
  currPage?: string;
  /** The type or title of the items being paginated. */
  items?: string;
  /** The title of the pagination options menu. */
  itemsPerPage?: string;
  /** Label for the English word "of". */
  ofWord?: string;
  /** Accessible label for the options toggle. */
  optionsToggle?: string;
  /** The title of a page displayed beside the page number. */
  page?: string;
  /** The title of a page displayed beside the page number (plural form). */
  pages?: string;
  /** Accessible label for the pagination component. */
  paginationTitle?: string;
  /** The suffix to be displayed after each option on the options menu dropdown. */
  perPageSuffix?: string;
  /** Accessible label for the button which moves to the first page. */
  toFirstPage?: string;
  /** Accessible label for the button which moves to the last page. */
  toLastPage?: string;
  /** Accessible label for the button which moves to the next page. */
  toNextPage?: string;
  /** Accessible label for the button which moves to the previous page. */
  toPreviousPage?: string;
}

export type OnSetPage = (
  _evt: React.MouseEvent | React.KeyboardEvent | MouseEvent,
  newPage: number,
  perPage?: number,
  startIdx?: number,
  endIdx?: number
) => void;

export type OnPerPageSelect = (
  _evt: React.MouseEvent | React.KeyboardEvent | MouseEvent,
  newPerPage: number,
  newPage: number,
  startIdx?: number,
  endIdx?: number
) => void;

/** The main pagination component. */

export interface PaginationProps extends React.HTMLProps<HTMLDivElement>, OUIAProps {
  /** What should be rendered inside the pagination. */
  children?: React.ReactNode;
  /** Additional classes for the pagination container. */
  className?: string;
  /** Indicate whether to show last full page of results when user selects perPage value
   * greater than remaining rows.
   */
  defaultToFullPage?: boolean;
  /** Direction of dropdown context menu. */
  dropDirection?: 'up' | 'down';
  /** Page to start at. */
  firstPage?: number;
  /** Flag indicating if pagination is compact. */
  isCompact?: boolean;
  /** Flag indicating if pagination is disabled. */
  isDisabled?: boolean;
  /** Flag indicating if pagination should not be sticky on mobile. */
  isStatic?: boolean;
  /** Flag indicating if pagination should stick to its position (based on variant). */
  isSticky?: boolean;
  /** Total number of items. */
  itemCount?: number;
  /** Last index of items on current page. */
  itemsEnd?: number;
  /** First index of items on current page. */
  itemsStart?: number;
  /** Start index of rows to display, used in place of providing page. */
  offset?: number;
  /** Current page number. */
  page?: number;
  /** Number of items per page. */
  perPage?: number;
  /** Component to be used for wrapping the toggle contents. Use "button" when you want
   * all of the toggle text to be clickable.
   */
  perPageComponent?: 'div' | 'button';
  /** Array of the number of items per page options. */
  perPageOptions?: PerPageOptions[];
  /** Function called when user clicks on navigate to first page. */
  onFirstClick?: (event: React.SyntheticEvent<HTMLButtonElement>, page: number) => void;
  /** Function called when user clicks on navigate to last page. */
  onLastClick?: (event: React.SyntheticEvent<HTMLButtonElement>, page: number) => void;
  /** Function called when user clicks on navigate to next page. */
  onNextClick?: (event: React.SyntheticEvent<HTMLButtonElement>, page: number) => void;
  /** Function called when user inputs page number. */
  onPageInput?: (event: React.SyntheticEvent<HTMLButtonElement>, page: number) => void;
  /** Function called when user selects number of items per page. */
  onPerPageSelect?: OnPerPageSelect;
  /** Function called when user clicks on navigate to previous page. */
  onPreviousClick?: (event: React.SyntheticEvent<HTMLButtonElement>, page: number) => void;
  /** Function called when user sets page. */
  onSetPage?: OnSetPage;
  /** Object with titles to display in pagination. */
  titles?: PaginationTitles;
  /** This will be shown in pagination toggle span. You can use firstIndex, lastIndex,
   * itemCount, itemsTitle, and/or ofWord props.
   */
  toggleTemplate?: ((props: ToggleTemplateProps) => React.ReactElement) | string;
  /** Position where pagination is rendered. */
  variant?: 'top' | 'bottom' | PaginationVariant;
  /** Id to ideintify widget on page. */
  widgetId?: string;
  /** Value to overwrite the randomly generated data-ouia-component-id.*/
  ouiaId?: number | string;
  /** Set the value of data-ouia-safe. Only set to true when the component is in a static state, i.e. no animations are occurring. At all other times, this value must be false. */
  ouiaSafe?: boolean;
}

const handleInputWidth = (lastPage: number, node: HTMLDivElement) => {
  if (!node) {
    return;
  }
  const len = String(lastPage).length;
  if (len >= 3) {
    node.style.setProperty(widthChars.name, `${len}`);
  } else {
    node.style.setProperty(widthChars.name, '2');
  }
};

let paginationId = 0;
export class Pagination extends React.Component<PaginationProps, { ouiaStateId: string }> {
  static displayName = 'Pagination';
  paginationRef = React.createRef<HTMLDivElement>();
  static defaultProps: PickOptional<PaginationProps> = {
    children: null,
    className: '',
    variant: PaginationVariant.top,
    isDisabled: false,
    isCompact: false,
    isSticky: false,
    perPage: defaultPerPageOptions[0].value,
    titles: {
      items: '',
      page: '',
      pages: '',
      itemsPerPage: 'Items per page',
      perPageSuffix: 'per page',
      toFirstPage: 'Go to first page',
      toPreviousPage: 'Go to previous page',
      toLastPage: 'Go to last page',
      toNextPage: 'Go to next page',
      optionsToggle: '',
      currPage: 'Current page',
      paginationTitle: 'Pagination',
      ofWord: 'of'
    },
    firstPage: 1,
    page: 0,
    offset: 0,
    defaultToFullPage: false,
    itemsStart: null,
    itemsEnd: null,
    perPageOptions: defaultPerPageOptions,
    widgetId: 'pagination-options-menu',
    onSetPage: () => undefined,
    onPerPageSelect: () => undefined,
    onFirstClick: () => undefined,
    onPreviousClick: () => undefined,
    onNextClick: () => undefined,
    onPageInput: () => undefined,
    onLastClick: () => undefined,
    ouiaSafe: true,
    perPageComponent: 'div'
  };

  state = {
    ouiaStateId: getDefaultOUIAId(Pagination.displayName, this.props.variant)
  };

  getLastPage() {
    const { itemCount, perPage, page } = this.props;
    // when itemCount is not known let's set lastPage as page+1 as we don't know the total count
    return itemCount || itemCount === 0 ? Math.ceil(itemCount / perPage) || 0 : page + 1;
  }

  componentDidMount() {
    const node = this.paginationRef.current;
    handleInputWidth(this.getLastPage(), node);
  }

  componentDidUpdate(prevProps: PaginationProps & OUIAProps) {
    const node = this.paginationRef.current;
    if (prevProps.perPage !== this.props.perPage || prevProps.itemCount !== this.props.itemCount) {
      handleInputWidth(this.getLastPage(), node);
    }
  }
  render() {
    const {
      children,
      className,
      variant,
      isDisabled,
      isCompact,
      isStatic,
      isSticky,
      perPage,
      titles,
      firstPage,
      page: propPage,
      offset,
      defaultToFullPage,
      itemCount,
      itemsStart,
      itemsEnd,
      perPageOptions,
      dropDirection: dropDirectionProp,
      widgetId,
      toggleTemplate,
      onSetPage,
      onPerPageSelect,
      onFirstClick,
      onPreviousClick,
      onNextClick,
      onPageInput,
      onLastClick,
      ouiaId,
      ouiaSafe,
      perPageComponent,
      ...props
    } = this.props;
    const dropDirection = dropDirectionProp || (variant === 'bottom' && !isStatic ? 'up' : 'down');

    let page = propPage;
    if (!page && offset) {
      page = Math.ceil(offset / perPage);
    }
    if (page === 0 && !itemCount) {
      page = 1;
    }

    const lastPage = this.getLastPage();
    let firstIndex = (page - 1) * perPage + 1;
    let lastIndex = page * perPage;

    if (itemCount || itemCount === 0) {
      firstIndex = itemCount <= 0 ? 0 : (page - 1) * perPage + 1;

      if (page < firstPage && itemCount > 0) {
        page = firstPage;
      } else if (page > lastPage) {
        page = lastPage;
      }

      if (itemCount >= 0) {
        lastIndex = page === lastPage || itemCount === 0 ? itemCount : page * perPage;
      }
    }

    const toggleTemplateProps = { firstIndex, lastIndex, itemCount, itemsTitle: titles.items, ofWord: titles.ofWord };

    return (
      <div
        ref={this.paginationRef}
        className={css(
          styles.pagination,
          variant === PaginationVariant.bottom && styles.modifiers.bottom,
          isCompact && styles.modifiers.compact,
          isStatic && styles.modifiers.static,
          isSticky && styles.modifiers.sticky,
          className
        )}
        id={`${widgetId}-${paginationId++}`}
        {...getOUIAProps(Pagination.displayName, ouiaId !== undefined ? ouiaId : this.state.ouiaStateId, ouiaSafe)}
        {...props}
      >
        {variant === PaginationVariant.top && (
          <div className={css(styles.paginationTotalItems)}>
            {toggleTemplate && typeof toggleTemplate === 'string' && fillTemplate(toggleTemplate, toggleTemplateProps)}
            {toggleTemplate &&
              typeof toggleTemplate !== 'string' &&
              (toggleTemplate as (props: ToggleTemplateProps) => React.ReactElement)(toggleTemplateProps)}
            {!toggleTemplate && (
              <ToggleTemplate
                firstIndex={firstIndex}
                lastIndex={lastIndex}
                itemCount={itemCount}
                itemsTitle={titles.items}
                ofWord={titles.ofWord}
              />
            )}
          </div>
        )}
        <PaginationOptionsMenu
          itemsPerPageTitle={titles.itemsPerPage}
          perPageSuffix={titles.perPageSuffix}
          itemsTitle={isCompact ? '' : titles.items}
          optionsToggle={titles.optionsToggle}
          perPageOptions={perPageOptions}
          firstIndex={itemsStart !== null ? itemsStart : firstIndex}
          lastIndex={itemsEnd !== null ? itemsEnd : lastIndex}
          ofWord={titles.ofWord}
          defaultToFullPage={defaultToFullPage}
          itemCount={itemCount}
          page={page}
          perPage={perPage}
          lastPage={lastPage}
          onPerPageSelect={onPerPageSelect}
          dropDirection={dropDirection}
          widgetId={widgetId}
          toggleTemplate={toggleTemplate}
          isDisabled={isDisabled}
          perPageComponent={perPageComponent}
        />
        <Navigation
          pagesTitle={titles.page}
          pagesTitlePlural={titles.pages}
          toLastPage={titles.toLastPage}
          toPreviousPage={titles.toPreviousPage}
          toNextPage={titles.toNextPage}
          toFirstPage={titles.toFirstPage}
          currPage={titles.currPage}
          paginationTitle={titles.paginationTitle}
          ofWord={titles.ofWord}
          page={itemCount && itemCount <= 0 ? 0 : page}
          perPage={perPage}
          itemCount={itemCount}
          firstPage={itemsStart !== null ? itemsStart : 1}
          lastPage={lastPage}
          onSetPage={onSetPage}
          onFirstClick={onFirstClick}
          onPreviousClick={onPreviousClick}
          onNextClick={onNextClick}
          onLastClick={onLastClick}
          onPageInput={onPageInput}
          isDisabled={isDisabled}
          isCompact={isCompact}
        />
        {children}
      </div>
    );
  }
}