import * as queryString from 'query-string';
import {Dropdown, Icon, Menu} from 'semantic-ui-react';
import {FormattedMessage} from 'react-intl';
import {IndiInfo, JsonGedcomData} from 'topola';
import {Link} from 'react-router-dom';
import {Media} from '../util/media';
import {MenuType} from './menu_item';
import {SearchBar} from './search';
import {UploadMenu} from './upload_menu';
import {UrlMenu} from './url_menu';
import {useHistory, useLocation} from 'react-router';
import {WikiTreeLoginMenu, WikiTreeMenu} from './wikitree_menu';

enum ScreenSize {
  LARGE,
  SMALL,
}

interface EventHandlers {
  onSelection: (indiInfo: IndiInfo) => void;
  onPrint: () => void;
  onDownloadPdf: () => void;
  onDownloadPng: () => void;
  onDownloadSvg: () => void;
}

interface Props {
  /** True if the application is currently showing a chart. */
  showingChart: boolean;
  /** Data used for the search index. */
  data?: JsonGedcomData;
  standalone: boolean;
  /** Whether to show the "All relatives" chart type in the menu. */
  allowAllRelativesChart: boolean;
  eventHandlers: EventHandlers;
  /** Whether to show additional WikiTree menus. */
  showWikiTreeMenus: boolean;
}

export function TopBar(props: Props) {
  const history = useHistory();
  const location = useLocation();

  function changeView(view: string) {
    const search = queryString.parse(location.search);
    if (search.view !== view) {
      search.view = view;
      location.search = queryString.stringify(search);
      history.push(location);
    }
  }

  function chartMenus(screenSize: ScreenSize) {
    if (!props.showingChart) {
      return null;
    }
    const chartTypeItems = (
      <>
        <Dropdown.Item onClick={() => changeView('hourglass')}>
          <Icon name="hourglass" />
          <FormattedMessage
            id="menu.hourglass"
            defaultMessage="Hourglass chart"
          />
        </Dropdown.Item>
        {props.allowAllRelativesChart ? (
          <Dropdown.Item onClick={() => changeView('relatives')}>
            <Icon name="users" />
            <FormattedMessage
              id="menu.relatives"
              defaultMessage="All relatives"
            />
          </Dropdown.Item>
        ) : null}
        <Dropdown.Item onClick={() => changeView('fancy')}>
          <Icon name="users" />
          <FormattedMessage
            id="menu.fancy"
            defaultMessage="Fancy tree (experimental)"
          />
        </Dropdown.Item>
      </>
    );
    switch (screenSize) {
      case ScreenSize.LARGE:
        return (
          <>
            <Menu.Item onClick={props.eventHandlers.onPrint}>
              <Icon name="print" />
              <FormattedMessage id="menu.print" defaultMessage="Print" />
            </Menu.Item>

            <Dropdown
              trigger={
                <div>
                  <Icon name="download" />
                  <FormattedMessage
                    id="menu.download"
                    defaultMessage="Download"
                  />
                </div>
              }
              className="item"
            >
              <Dropdown.Menu>
                <Dropdown.Item onClick={props.eventHandlers.onDownloadPdf}>
                  <FormattedMessage
                    id="menu.pdf_file"
                    defaultMessage="PDF file"
                  />
                </Dropdown.Item>
                <Dropdown.Item onClick={props.eventHandlers.onDownloadPng}>
                  <FormattedMessage
                    id="menu.png_file"
                    defaultMessage="PNG file"
                  />
                </Dropdown.Item>
                <Dropdown.Item onClick={props.eventHandlers.onDownloadSvg}>
                  <FormattedMessage
                    id="menu.svg_file"
                    defaultMessage="SVG file"
                  />
                </Dropdown.Item>
              </Dropdown.Menu>
            </Dropdown>

            <Dropdown
              trigger={
                <div>
                  <Icon name="eye" />
                  <FormattedMessage id="menu.view" defaultMessage="View" />
                </div>
              }
              className="item"
            >
              <Dropdown.Menu>{chartTypeItems}</Dropdown.Menu>
            </Dropdown>
            <SearchBar
              data={props.data!}
              onSelection={props.eventHandlers.onSelection}
              {...props}
            />
          </>
        );

      case ScreenSize.SMALL:
        return (
          <>
            <Dropdown.Item onClick={props.eventHandlers.onPrint}>
              <Icon name="print" />
              <FormattedMessage id="menu.print" defaultMessage="Print" />
            </Dropdown.Item>

            <Dropdown.Divider />

            <Dropdown.Item onClick={props.eventHandlers.onDownloadPdf}>
              <Icon name="download" />
              <FormattedMessage
                id="menu.download_pdf"
                defaultMessage="Download PDF"
              />
            </Dropdown.Item>
            <Dropdown.Item onClick={props.eventHandlers.onDownloadPng}>
              <Icon name="download" />
              <FormattedMessage
                id="menu.download_png"
                defaultMessage="Download PNG"
              />
            </Dropdown.Item>
            <Dropdown.Item onClick={props.eventHandlers.onDownloadSvg}>
              <Icon name="download" />
              <FormattedMessage
                id="menu.download_svg"
                defaultMessage="Download SVG"
              />
            </Dropdown.Item>

            <Dropdown.Divider />
            {chartTypeItems}
            <Dropdown.Divider />
          </>
        );
    }
  }

  function title() {
    return (
      <Menu.Item>
        <b>Topola Genealogy</b>
      </Menu.Item>
    );
  }

  function fileMenus(screenSize: ScreenSize) {
    // In standalone WikiTree mode, show only the "Select WikiTree ID" menu.
    if (!props.standalone && props.showWikiTreeMenus) {
      switch (screenSize) {
        case ScreenSize.LARGE:
          return <WikiTreeMenu menuType={MenuType.Menu} {...props} />;
        case ScreenSize.SMALL:
          return (
            <>
              <WikiTreeMenu menuType={MenuType.Dropdown} {...props} />
              <Dropdown.Divider />
            </>
          );
      }
    }

    // Don't show "open" menus in non-standalone mode.
    if (!props.standalone) {
      return null;
    }

    switch (screenSize) {
      case ScreenSize.LARGE:
        // Show dropdown if chart is shown, otherwise show individual menu
        // items.
        const menus = props.showingChart ? (
          <Dropdown
            trigger={
              <div>
                <Icon name="folder open" />
                <FormattedMessage id="menu.open" defaultMessage="Open" />
              </div>
            }
            className="item"
          >
            <Dropdown.Menu>
              <UploadMenu menuType={MenuType.Dropdown} {...props} />
              <UrlMenu menuType={MenuType.Dropdown} {...props} />
              <WikiTreeMenu menuType={MenuType.Dropdown} {...props} />
            </Dropdown.Menu>
          </Dropdown>
        ) : (
          <>
            <UploadMenu menuType={MenuType.Menu} {...props} />
            <UrlMenu menuType={MenuType.Menu} {...props} />
            <WikiTreeMenu menuType={MenuType.Menu} {...props} />
          </>
        );
        return menus;

      case ScreenSize.SMALL:
        return (
          <>
            <UploadMenu menuType={MenuType.Dropdown} {...props} />
            <UrlMenu menuType={MenuType.Dropdown} {...props} />
            <WikiTreeMenu menuType={MenuType.Dropdown} {...props} />
            <Dropdown.Divider />
          </>
        );
    }
  }

  function wikiTreeLoginMenu(screenSize: ScreenSize) {
    if (!props.showWikiTreeMenus) {
      return null;
    }
    return (
      <>
        <WikiTreeLoginMenu
          menuType={
            screenSize === ScreenSize.SMALL ? MenuType.Dropdown : MenuType.Menu
          }
          {...props}
        />
        {screenSize === ScreenSize.SMALL ? <Dropdown.Divider /> : null}
      </>
    );
  }

  function mobileMenus() {
    return (
      <>
        <Dropdown
          trigger={
            <div>
              <Icon name="sidebar" />
            </div>
          }
          className="item"
          icon={null}
        >
          <Dropdown.Menu>
            {fileMenus(ScreenSize.SMALL)}
            {chartMenus(ScreenSize.SMALL)}
            {wikiTreeLoginMenu(ScreenSize.SMALL)}

            <Dropdown.Item
              href="https://github.com/PeWu/topola-viewer"
              target="_blank"
              rel="noopener noreferrer"
            >
              <FormattedMessage
                id="menu.github"
                defaultMessage="GitHub project"
              />
            </Dropdown.Item>
          </Dropdown.Menu>
        </Dropdown>
        {props.standalone ? <Link to="/">{title()}</Link> : title()}
      </>
    );
  }

  function desktopMenus() {
    return (
      <>
        {props.standalone ? <Link to="/">{title()}</Link> : null}
        {fileMenus(ScreenSize.LARGE)}
        {chartMenus(ScreenSize.LARGE)}
        <Menu.Menu position="right">
          {wikiTreeLoginMenu(ScreenSize.LARGE)}
          <Menu.Item
            href="https://github.com/PeWu/topola-viewer"
            target="_blank"
            rel="noopener noreferrer"
          >
            <FormattedMessage
              id="menu.github"
              defaultMessage="GitHub project"
            />
          </Menu.Item>
        </Menu.Menu>
      </>
    );
  }

  return (
    <>
      <Menu
        as={Media}
        greaterThanOrEqual="large"
        attached="top"
        inverted
        color="blue"
        size="large"
      >
        {desktopMenus()}
      </Menu>
      <Menu
        as={Media}
        at="small"
        attached="top"
        inverted
        color="blue"
        size="large"
      >
        {mobileMenus()}
      </Menu>
    </>
  );
}