import React, { useState, useEffect } from 'react';
import PropTypes from 'prop-types';
import { useTranslation } from 'react-i18next';
import { useDispatch } from 'react-redux';

import userService from '../api/services/userService';
import SyncIcon from '../assets/sync.svg';
import Trash from '../assets/trash.svg';
import caretSort from '../assets/caret-sort.svg';
import DropdownMenu from '../components/DropdownMenu';
import { Doc, DocumentsProps, ActiveState } from '../models/misc'; // Ensure ActiveState type is imported
import SkeletonLoader from '../components/SkeletonLoader';
import { getDocs, getDocsWithPagination } from '../preferences/preferenceApi';
import { setSourceDocs } from '../preferences/preferenceSlice';
import Input from '../components/Input';
import Upload from '../upload/Upload'; // Import the Upload component
import Pagination from '../components/DocumentPagination';

// Utility function to format numbers
const formatTokens = (tokens: number): string => {
  const roundToTwoDecimals = (num: number): string => {
    return (Math.round((num + Number.EPSILON) * 100) / 100).toString();
  };

  if (tokens >= 1_000_000_000) {
    return roundToTwoDecimals(tokens / 1_000_000_000) + 'b';
  } else if (tokens >= 1_000_000) {
    return roundToTwoDecimals(tokens / 1_000_000) + 'm';
  } else if (tokens >= 1_000) {
    return roundToTwoDecimals(tokens / 1_000) + 'k';
  } else {
    return tokens.toString();
  }
};

const Documents: React.FC<DocumentsProps> = ({ handleDeleteDocument }) => {
  const { t } = useTranslation();
  const dispatch = useDispatch();
  // State for search input
  const [searchTerm, setSearchTerm] = useState('');
  // State for modal: active/inactive
  const [modalState, setModalState] = useState<ActiveState>('INACTIVE'); // Initialize with inactive state
  const [isOnboarding, setIsOnboarding] = useState(false); // State for onboarding flag
  const [loading, setLoading] = useState(false);
  const [sortField, setSortField] = useState<'date' | 'tokens'>('date');
  const [sortOrder, setSortOrder] = useState<'asc' | 'desc'>('desc');
  // Pagination
  const [currentPage, setCurrentPage] = useState<number>(1);
  const [rowsPerPage, setRowsPerPage] = useState<number>(10);
  const [totalPages, setTotalPages] = useState<number>(1);
  const [totalDocuments, setTotalDocuments] = useState<number>(0);
  const [fetchedDocuments, setFetchedDocuments] = useState<Doc[]>([]);
  // Filter documents based on the search term
  const filteredDocuments = fetchedDocuments?.filter((document) =>
    document.name.toLowerCase().includes(searchTerm.toLowerCase()),
  );
  // State for documents
  const currentDocuments = filteredDocuments ?? [];
  const syncOptions = [
    { label: 'Never', value: 'never' },
    { label: 'Daily', value: 'daily' },
    { label: 'Weekly', value: 'weekly' },
    { label: 'Monthly', value: 'monthly' },
  ];

  const refreshDocs = (
    field: 'date' | 'tokens' | undefined,
    pageNumber?: number,
    rows?: number,
  ) => {
    const page = pageNumber ?? currentPage;
    const rowsPerPg = rows ?? rowsPerPage;

    if (field !== undefined) {
      if (field === sortField) {
        // Toggle sort order
        setSortOrder(sortOrder === 'asc' ? 'desc' : 'asc');
      } else {
        // Change sort field and reset order to 'desc'
        setSortField(field);
        setSortOrder('desc');
      }
    }
    getDocsWithPagination(sortField, sortOrder, page, rowsPerPg)
      .then((data) => {
        //dispatch(setSourceDocs(data ? data.docs : []));
        setFetchedDocuments(data ? data.docs : []);
        setTotalPages(data ? data.totalPages : 0);
        setTotalDocuments(data ? data.totalDocuments : 0);
      })
      .catch((error) => console.error(error))
      .finally(() => {
        setLoading(false);
      });
  };

  const handleManageSync = (doc: Doc, sync_frequency: string) => {
    setLoading(true);
    userService
      .manageSync({ source_id: doc.id, sync_frequency })
      .then(() => {
        return getDocs();
      })
      .then((data) => {
        dispatch(setSourceDocs(data));
      })
      .catch((error) => console.error(error))
      .finally(() => {
        setLoading(false);
      });
  };

  useEffect(() => {
    if (modalState === 'INACTIVE') {
      refreshDocs(sortField, currentPage, rowsPerPage);
    }
  }, [modalState, sortField, currentPage, rowsPerPage]);

  return (
    <div className="mt-8">
      <div className="flex flex-col relative">
        <div className="z-10 w-full overflow-x-auto">
          <div className="my-3 flex justify-between items-center">
            <div className="p-1">
              <Input
                maxLength={256}
                placeholder="Search..."
                name="Document-search-input"
                type="text"
                id="document-search-input"
                value={searchTerm}
                onChange={(e) => setSearchTerm(e.target.value)} // Handle search input change
              />
            </div>
            <button
              className="rounded-full w-40 bg-purple-30 px-4 py-3 text-white hover:bg-[#6F3FD1]"
              onClick={() => {
                setIsOnboarding(false); // Set onboarding flag if needed
                setModalState('ACTIVE'); // Open the upload modal
              }}
            >
              Add New
            </button>
          </div>
          {loading ? (
            <SkeletonLoader count={1} />
          ) : (
            <table className="table-default">
              <thead>
                <tr>
                  <th>{t('settings.documents.name')}</th>
                  <th>
                    <div className="flex justify-center items-center">
                      {t('settings.documents.date')}
                      <img
                        className="cursor-pointer"
                        onClick={() => refreshDocs('date')}
                        src={caretSort}
                        alt="sort"
                      />
                    </div>
                  </th>
                  <th>
                    <div className="flex justify-center items-center">
                      {t('settings.documents.tokenUsage')}
                      <img
                        className="cursor-pointer"
                        onClick={() => refreshDocs('tokens')}
                        src={caretSort}
                        alt="sort"
                      />
                    </div>
                  </th>
                  <th>
                    <div className="flex justify-center items-center">
                      {t('settings.documents.type')}
                    </div>
                  </th>
                  <th></th>
                </tr>
              </thead>
              <tbody>
                {!currentDocuments?.length && (
                  <tr>
                    <td colSpan={5} className="!p-4">
                      {t('settings.documents.noData')}
                    </td>
                  </tr>
                )}
                {Array.isArray(currentDocuments) &&
                  currentDocuments.map((document, index) => (
                    <tr key={index} className="text-nowrap font-normal">
                      <td>{document.name}</td>
                      <td>{document.date}</td>
                      <td>
                        {document.tokens ? formatTokens(+document.tokens) : ''}
                      </td>
                      <td>
                        {document.type === 'remote' ? 'Pre-loaded' : 'Private'}
                      </td>
                      <td>
                        <div className="min-w-[70px] flex flex-row items-end justify-end ml-auto">
                          {document.type !== 'remote' && (
                            <img
                              src={Trash}
                              alt="Delete"
                              className="h-4 w-4 cursor-pointer opacity-60 hover:opacity-100"
                              id={`img-${index}`}
                              onClick={(event) => {
                                event.stopPropagation();
                                handleDeleteDocument(index, document);
                              }}
                            />
                          )}
                          {document.syncFrequency && (
                            <div className="ml-2">
                              <DropdownMenu
                                name="Sync"
                                options={syncOptions}
                                onSelect={(value: string) => {
                                  handleManageSync(document, value);
                                }}
                                defaultValue={document.syncFrequency}
                                icon={SyncIcon}
                              />
                            </div>
                          )}
                        </div>
                      </td>
                    </tr>
                  ))}
              </tbody>
            </table>
          )}
        </div>
        {/* Conditionally render the Upload modal based on modalState */}
        {modalState === 'ACTIVE' && (
          <div className="fixed top-0 left-0 w-screen h-screen z-50 flex items-center justify-center bg-transparent">
            <div className="w-full h-full bg-transparent flex flex-col items-center justify-center p-8">
              {/* Your Upload component */}
              <Upload
                modalState={modalState}
                setModalState={setModalState}
                isOnboarding={isOnboarding}
              />
            </div>
          </div>
        )}
      </div>
      {/* Pagination component with props:
      # Note: Every time the page changes, 
      the refreshDocs function is called with the updated page number and rows per page.
      and reset cursor paginated query parameter to undefined.
      */}
      <Pagination
        currentPage={currentPage}
        totalPages={totalPages}
        rowsPerPage={rowsPerPage}
        onPageChange={(page) => {
          setCurrentPage(page);
          refreshDocs(sortField, page, rowsPerPage); // Pass `true` to reset lastID if not using cursor
        }}
        onRowsPerPageChange={(rows) => {
          console.log('Pagination - Rows per Page Change:', rows);
          setRowsPerPage(rows);
          setCurrentPage(1); // Reset to page 1 on rows per page change
          refreshDocs(sortField, 1, rows); // Reset lastID for fresh pagination
        }}
      />
    </div>
  );
};

Documents.propTypes = {
  //documents: PropTypes.array.isRequired,
  handleDeleteDocument: PropTypes.func.isRequired,
};

export default Documents;