import React, {
  useState,
  useCallback,
  useEffect,
  useContext,
  useRef,
} from 'react';
import PropTypes from 'prop-types';
import classnames from 'classnames';
import { isEqual } from 'lodash';
import { I18nContext } from '../../../contexts/i18n';
import SearchableItemList from '../searchable-item-list';
import PulseLoader from '../../../components/ui/pulse-loader';
import UrlIcon from '../../../components/ui/url-icon';

export default function DropdownSearchList({
  searchListClassName,
  itemsToSearch,
  selectPlaceHolderText,
  fuseSearchKeys,
  defaultToAll,
  maxListItems,
  onSelect,
  startingItem,
  onOpen,
  onClose,
  className = '',
  externallySelectedItem,
  selectorClosedClassName,
  loading,
  hideRightLabels,
  hideItemIf,
  listContainerClassName,
}) {
  const t = useContext(I18nContext);
  const [isOpen, setIsOpen] = useState(false);
  const [selectedItem, setSelectedItem] = useState(startingItem);
  const close = useCallback(() => {
    setIsOpen(false);
    onClose?.();
  }, [onClose]);

  const onClickItem = useCallback(
    (item) => {
      onSelect?.(item);
      setSelectedItem(item);
      close();
    },
    [onSelect, close],
  );

  const onClickSelector = useCallback(() => {
    if (!isOpen) {
      setIsOpen(true);
      onOpen?.();
    }
  }, [isOpen, onOpen]);

  const prevExternallySelectedItemRef = useRef();
  useEffect(() => {
    prevExternallySelectedItemRef.current = externallySelectedItem;
  });
  const prevExternallySelectedItem = prevExternallySelectedItemRef.current;

  useEffect(() => {
    if (
      externallySelectedItem &&
      !isEqual(externallySelectedItem, selectedItem)
    ) {
      setSelectedItem(externallySelectedItem);
    } else if (prevExternallySelectedItem && !externallySelectedItem) {
      setSelectedItem(null);
    }
  }, [externallySelectedItem, selectedItem, prevExternallySelectedItem]);

  const onKeyUp = (e) => {
    if (e.key === 'Escape') {
      close();
    } else if (e.key === 'Enter') {
      onClickSelector(e);
    }
  };

  return (
    <div
      className={classnames('dropdown-search-list', className)}
      onClick={onClickSelector}
      onKeyUp={onKeyUp}
      tabIndex="0"
    >
      {!isOpen && (
        <div
          className={classnames(
            'dropdown-search-list__selector-closed-container',
            selectorClosedClassName,
          )}
        >
          <div className="dropdown-search-list__selector-closed">
            {selectedItem?.iconUrl && (
              <UrlIcon
                url={selectedItem.iconUrl}
                className="dropdown-search-list__selector-closed-icon"
                name={selectedItem?.symbol}
              />
            )}
            {!selectedItem?.iconUrl && (
              <div className="dropdown-search-list__default-dropdown-icon" />
            )}
            <div className="dropdown-search-list__labels">
              <div className="dropdown-search-list__item-labels">
                <span
                  className={classnames(
                    'dropdown-search-list__closed-primary-label',
                    {
                      'dropdown-search-list__select-default': !selectedItem?.symbol,
                    },
                  )}
                >
                  {selectedItem?.symbol || selectPlaceHolderText}
                </span>
              </div>
            </div>
          </div>
          <i className="fa fa-caret-down fa-lg dropdown-search-list__caret" />
        </div>
      )}
      {isOpen && (
        <>
          <SearchableItemList
            itemsToSearch={loading ? [] : itemsToSearch}
            Placeholder={({ searchQuery }) =>
              loading ? (
                <div className="dropdown-search-list__loading-item">
                  <PulseLoader />
                  <div className="dropdown-search-list__loading-item-text-container">
                    <span className="dropdown-search-list__loading-item-text">
                      {t('swapFetchingTokens')}
                    </span>
                  </div>
                </div>
              ) : (
                <div className="dropdown-search-list__placeholder">
                  {t('swapBuildQuotePlaceHolderText', [searchQuery])}
                </div>
              )
            }
            searchPlaceholderText={t('swapSearchForAToken')}
            fuseSearchKeys={fuseSearchKeys}
            defaultToAll={defaultToAll}
            onClickItem={onClickItem}
            maxListItems={maxListItems}
            className={classnames(
              'dropdown-search-list__token-container',
              searchListClassName,
              {
                'dropdown-search-list--open': isOpen,
              },
            )}
            hideRightLabels={hideRightLabels}
            hideItemIf={hideItemIf}
            listContainerClassName={listContainerClassName}
          />
          <div
            className="dropdown-search-list__close-area"
            onClick={(event) => {
              event.stopPropagation();
              setIsOpen(false);
              onClose?.();
            }}
          />
        </>
      )}
    </div>
  );
}

DropdownSearchList.propTypes = {
  itemsToSearch: PropTypes.array,
  onSelect: PropTypes.func,
  searchListClassName: PropTypes.string,
  fuseSearchKeys: PropTypes.arrayOf(
    PropTypes.shape({
      name: PropTypes.string,
      weight: PropTypes.number,
    }),
  ),
  defaultToAll: PropTypes.bool,
  maxListItems: PropTypes.number,
  startingItem: PropTypes.object,
  onOpen: PropTypes.func,
  onClose: PropTypes.func,
  className: PropTypes.string,
  externallySelectedItem: PropTypes.object,
  loading: PropTypes.bool,
  selectPlaceHolderText: PropTypes.string,
  selectorClosedClassName: PropTypes.string,
  hideRightLabels: PropTypes.bool,
  hideItemIf: PropTypes.func,
  listContainerClassName: PropTypes.string,
};