// @flow strict

import * as React from 'react';
//$FlowFixMe[untyped-import]
import Highcharts from 'highcharts';
//$FlowFixMe[untyped-import]
import accessibility from 'highcharts/modules/accessibility';
//$FlowFixMe[untyped-import]
import drilldown from 'highcharts/modules/drilldown';
//$FlowFixMe[untyped-import]
import exporting from 'highcharts/modules/exporting';

import {size180} from '../../../styles/variables/_size';
import classify from '../../../utils/classify';
import {ANCHOR_POSITION_TYPE, ButtonDropdown} from '../../ButtonDropdown';
import {
  Card,
  CardActions,
  CardContent,
  CardHeader,
  CardTitle,
} from '../../Card';
import {CircularLoader} from '../../CircularLoader';
import type {MenuOption} from '../../Menu';

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


export type ExportOptionType = {
  key: string,
  label: string,
  format: string,
};

export const EXPORT_OPTIONS = Object.freeze({
  download_as_png: {
    key: 'download_as_png',
    label: 'Download as PNG',
    format: 'image/png',
  },
  download_as_jpeg: {
    key: 'download_as_jpeg',
    label: 'Download as JPEG',
    format: 'image/jpeg',
  },
  download_as_pdf: {
    key: 'download_as_pdf',
    label: 'Download as PDF',
    format: 'application/pdf',
  },
  download_as_svg: {
    key: 'download_as_svg',
    label: 'Download as SVG',
    format: 'image/svg+xml',
  },
});

// on assumption that all export options will be shown by default
const DEFAULT_EXPORT_OPTIONS = Object.keys(EXPORT_OPTIONS).map(
  (exportKey) => EXPORT_OPTIONS[exportKey],
);

type CustomExportButtonProps = {
  ref?: HTMLDivElement,
  customExportOptions?: Array<ExportOptionType> | null,
};

const CustomExportButton = React.forwardRef<
  CustomExportButtonProps,
  HTMLDivElement,
>(({customExportOptions = null}: CustomExportButtonProps, ref) => {
  exporting(Highcharts);
  drilldown(Highcharts);
  accessibility(Highcharts);

  const exportOptions = customExportOptions
    ? customExportOptions
    : DEFAULT_EXPORT_OPTIONS;

  const menuOptions: Array<MenuOption> = exportOptions.map((exportOption) => {
    const {key, label} = exportOption;
    return {key, label};
  });

  const handleDownload = (exportKey: string): void => {
    const exportOptionObject = exportOptions.find(
      (exportOption) => exportOption.key === exportKey,
    );
    const exportFormat = exportOptionObject?.format || '';
    if (ref.current) {
      // $FlowFixMe[prop-missing]
      // $FlowFixMe[incompatible-use]
      ref.current.chart?.exportChart({type: exportFormat});
    }
  };

  return (
    <ButtonDropdown
      ariaLabel="Export Chart Menu"
      menu={{
        isFluid: true,
        menuDisabled: false,
        options: menuOptions,
        size: 'medium',
        width: size180,
      }}
      iconLeftName="ellipsis"
      onOptionSelect={(option) => handleDownload(option.key)}
      size="small"
      type="ghost"
      anchorPosition={ANCHOR_POSITION_TYPE.bottomEnd}
    />
  );
});

export type ChartWrapperClassNames = $ReadOnly<{
  wrapper?: string,
  header?: string,
  title?: string,
  actions?: string,
  content?: string,
  loader?: string,
}>;

type ChartWrapperProps = {
  isLoading?: boolean,
  title: React.Node,
  children?: React.Node,
  classNames?: ChartWrapperClassNames,
  customExportOptions?: Array<ExportOptionType> | null,
  headerActions?: React.Node,
  hasEmptyData?: boolean,
  emptyText?: React.Node,
};

export const ChartWrapper: React$AbstractComponent<
  ChartWrapperProps,
  HTMLDivElement,
> = React.forwardRef<ChartWrapperProps, HTMLDivElement>(
  (
    {
      isLoading,
      title,
      children,
      classNames,
      customExportOptions,
      headerActions,
      hasEmptyData = false,
      emptyText,
    }: ChartWrapperProps,
    ref,
  ): React.Node => (
    <Card
      classNames={{
        wrapper: classify(
          css.wrapper,
          {[css.justifyCenter]: isLoading},
          classNames?.wrapper,
        ),
      }}
    >
      {isLoading ? (
        <CircularLoader
          size="large"
          className={classify(css.loader, classNames?.loader)}
        />
      ) : (
        <>
          <CardHeader className={classNames?.header}>
            <CardTitle className={classNames?.title}>{title}</CardTitle>
            <CardActions
              className={classify(css.chartCardActions, classNames?.actions)}
            >
              <CustomExportButton
                ref={ref}
                customExportOptions={customExportOptions}
              />
              {headerActions ? headerActions : null}
            </CardActions>
          </CardHeader>
          <CardContent
            className={classify(css.chartContent, classNames?.content)}
          >
            {hasEmptyData && emptyText ? emptyText : children}
          </CardContent>
        </>
      )}
    </Card>
  ),
);