import React from 'react';
import {
  Button,
  Dropdown,
  DropdownList,
  DropdownItem,
  MenuToggle,
  MenuToggleElement,
  Modal,
  ModalBody,
  ModalHeader,
  ModalFooter,
  ModalVariant
} from '@patternfly/react-core';

export const ModalWithDropdown: React.FunctionComponent = () => {
  const [isModalOpen, setIsModalOpen] = React.useState(false);
  const [isDropdownOpen, setIsDropdownOpen] = React.useState(false);

  const handleModalToggle = (_event: KeyboardEvent | React.MouseEvent) => {
    setIsModalOpen(!isModalOpen);
    setIsDropdownOpen(false);
  };

  const handleDropdownToggle = () => {
    setIsDropdownOpen(!isDropdownOpen);
  };

  const onSelect = () => {
    setIsDropdownOpen(!isDropdownOpen);
    onFocus();
  };

  const onFocus = () => {
    const element = document.getElementById('modal-dropdown-toggle');
    (element as HTMLElement).focus();
  };

  const onEscapePress = (event: KeyboardEvent) => {
    if (isDropdownOpen) {
      setIsDropdownOpen(!isDropdownOpen);
      onFocus();
    } else {
      handleModalToggle(event);
    }
  };

  return (
    <React.Fragment>
      <Button variant="primary" onClick={handleModalToggle}>
        Show dropdown modal
      </Button>
      <Modal
        variant={ModalVariant.small}
        isOpen={isModalOpen}
        onClose={handleModalToggle}
        onEscapePress={onEscapePress}
        aria-labelledby="modal-with-dropdown"
        aria-describedby="modal-box-body-with-dropdown"
      >
        <ModalHeader title="Dropdown modal" labelId="modal-with-dropdown" />
        <ModalBody id="modal-box-body-with-dropdown">
          <div>
            Set the dropdown <strong>menuAppendTo</strong> prop to <em>parent</em> in order to allow the dropdown menu
            break out of the modal container. You'll also want to handle closing of the modal yourself, by listening to
            the <strong>onEscapePress</strong> callback on the Modal component, so you can close the Dropdown first if
            it's open without closing the entire modal.
          </div>
          <br />
          <div>
            <Dropdown
              isOpen={isDropdownOpen}
              onSelect={onSelect}
              onOpenChange={(isOpen: boolean) => setIsDropdownOpen(isOpen)}
              toggle={(toggleRef: React.Ref<MenuToggleElement>) => (
                <MenuToggle ref={toggleRef} onClick={handleDropdownToggle} isExpanded={isDropdownOpen}>
                  Dropdown
                </MenuToggle>
              )}
            >
              <DropdownList>
                <DropdownItem value={0} key="action">
                  Action
                </DropdownItem>
                <DropdownItem
                  value={1}
                  key="link"
                  to="#default-link2"
                  // Prevent the default onClick functionality for example purposes
                  onClick={(ev: any) => ev.preventDefault()}
                >
                  Link
                </DropdownItem>
                <DropdownItem value={2} isDisabled key="disabled action">
                  Disabled Action
                </DropdownItem>
                <DropdownItem value={3} isDisabled key="disabled link" to="#default-link4">
                  Disabled Link
                </DropdownItem>
              </DropdownList>
            </Dropdown>
          </div>
        </ModalBody>
        <ModalFooter>
          <Button key="confirm" variant="primary" onClick={handleModalToggle}>
            Confirm
          </Button>
          <Button key="cancel" variant="link" onClick={handleModalToggle}>
            Cancel
          </Button>
        </ModalFooter>
      </Modal>
    </React.Fragment>
  );
};
