import React, { useState } from 'react';
import Trash from '../assets/trash.svg';
import Arrow2 from '../assets/dropdown-arrow.svg';
import { Doc, ActiveState } from '../models/misc';
import { useDispatch } from 'react-redux';
import { useTranslation } from 'react-i18next';
import ConfirmationModal from '../modals/ConfirmationModal';

type Props = {
  options: Doc[] | null;
  selectedDocs: Doc | null;
  setSelectedDocs: any;
  isDocsListOpen: boolean;
  setIsDocsListOpen: React.Dispatch<React.SetStateAction<boolean>>;
  handleDeleteClick: any;
  handlePostDocumentSelect: any;
};

function SourceDropdown({
  options,
  setSelectedDocs,
  selectedDocs,
  setIsDocsListOpen,
  isDocsListOpen,
  handleDeleteClick,
  handlePostDocumentSelect, // Callback function fired after a document is selected
}: Props) {
  const dispatch = useDispatch();
  const { t } = useTranslation();
  const dropdownRef = React.useRef<HTMLDivElement>(null);
  const embeddingsName =
    import.meta.env.VITE_EMBEDDINGS_NAME ||
    'huggingface_sentence-transformers/all-mpnet-base-v2';

  const [deleteModalState, setDeleteModalState] =
    useState<ActiveState>('INACTIVE');
  const [documentToDelete, setDocumentToDelete] = useState<Doc | null>(null);

  const handleEmptyDocumentSelect = () => {
    dispatch(setSelectedDocs(null));
    setIsDocsListOpen(false);
  };

  const handleClickOutside = (event: MouseEvent) => {
    if (
      dropdownRef.current &&
      !dropdownRef.current.contains(event.target as Node)
    ) {
      setIsDocsListOpen(false);
    }
  };

  React.useEffect(() => {
    document.addEventListener('mousedown', handleClickOutside);
    return () => {
      document.removeEventListener('mousedown', handleClickOutside);
    };
  }, []);

  const confirmDelete = (option: Doc) => {
    setDocumentToDelete(option);
    setDeleteModalState('ACTIVE');
  };

  const handleConfirmedDelete = () => {
    if (documentToDelete) {
      handleDeleteClick(documentToDelete);
      setDeleteModalState('INACTIVE');
      setDocumentToDelete(null);
    }
  };

  const handleCancelDelete = () => {
    setDeleteModalState('INACTIVE');
    setDocumentToDelete(null);
  };

  return (
    <div className="relative w-5/6 rounded-3xl" ref={dropdownRef}>
      <button
        onClick={() => setIsDocsListOpen(!isDocsListOpen)}
        className={`border-silver flex w-full cursor-pointer items-center border bg-white p-[11px] dark:bg-transparent ${
          isDocsListOpen
            ? 'dark:border-silver/40 rounded-t-3xl'
            : 'dark:border-purple-taupe rounded-3xl'
        }`}
      >
        <span className="dark:text-bright-gray mr-2 ml-1 flex-1 overflow-hidden text-left text-ellipsis">
          <div className="flex flex-row gap-2">
            <p className="max-w-3/4 truncate whitespace-nowrap">
              {selectedDocs?.name || 'None'}
            </p>
          </div>
        </span>
        <img
          src={Arrow2}
          alt="arrow"
          className={`transform ${
            isDocsListOpen ? 'rotate-180' : 'rotate-0'
          } h-3 w-3 transition-transform`}
        />
      </button>
      {isDocsListOpen && (
        <div className="border-silver dark:border-silver/40 dark:bg-dark-charcoal absolute right-0 left-0 z-20 -mt-1 max-h-28 overflow-y-auto rounded-b-xl border bg-white shadow-lg">
          {options ? (
            options.map((option: any, index: number) => {
              if (option.model === embeddingsName) {
                return (
                  <div
                    key={index}
                    className="dark:text-bright-gray flex cursor-pointer items-center justify-between hover:bg-gray-100 dark:hover:bg-[#545561]"
                    onClick={() => {
                      dispatch(setSelectedDocs(option));
                      setIsDocsListOpen(false);
                      handlePostDocumentSelect(option);
                    }}
                  >
                    <span
                      onClick={() => {
                        setIsDocsListOpen(false);
                      }}
                      className="ml-4 flex-1 overflow-hidden py-3 text-ellipsis whitespace-nowrap"
                    >
                      {option.name}
                    </span>
                    {option.location === 'local' && (
                      <img
                        src={Trash}
                        alt="Delete"
                        className="mr-4 h-4 w-4 cursor-pointer hover:opacity-50"
                        id={`img-${index}`}
                        onClick={(event) => {
                          event.stopPropagation();
                          confirmDelete(option);
                        }}
                      />
                    )}
                  </div>
                );
              }
            })
          ) : (
            <></>
          )}
          <div
            className="dark:text-bright-gray dark:hover:bg-purple-taupe flex cursor-pointer items-center justify-between hover:bg-gray-100"
            onClick={handleEmptyDocumentSelect}
          >
            <span
              className="ml-4 flex-1 overflow-hidden py-3 text-ellipsis whitespace-nowrap"
              onClick={() => {
                handlePostDocumentSelect(null);
              }}
            >
              {t('none')}
            </span>
          </div>
        </div>
      )}
      <ConfirmationModal
        message={t('settings.documents.deleteWarning', {
          name: documentToDelete?.name,
        })}
        modalState={deleteModalState}
        setModalState={setDeleteModalState}
        handleSubmit={handleConfirmedDelete}
        handleCancel={handleCancelDelete}
        submitLabel={t('convTile.delete')}
        variant="danger"
      />
    </div>
  );
}

export default SourceDropdown;