import { IconBell } from '@tabler/icons';
import { useState } from 'react';
import StyledWrapper from './StyleWrapper';
import Modal from 'components/Modal/index';
import Portal from 'components/Portal';
import { useEffect } from 'react';
import { useApp } from 'providers/App';
import {
  fetchNotifications,
  markAllNotificationsAsRead,
  markNotificationAsRead
} from 'providers/ReduxStore/slices/notifications';
import { useDispatch, useSelector } from 'react-redux';
import { humanizeDate, relativeDate } from 'utils/common';
import ToolHint from 'components/ToolHint';
import DOMPurify from 'dompurify';

const PAGE_SIZE = 5;

const Notifications = () => {
  const dispatch = useDispatch();
  const { version } = useApp();
  const notifications = useSelector((state) => state.notifications.notifications);

  const [showNotificationsModal, setShowNotificationsModal] = useState(false);
  const [selectedNotification, setSelectedNotification] = useState(null);
  const [pageNumber, setPageNumber] = useState(1);

  const notificationsStartIndex = (pageNumber - 1) * PAGE_SIZE;
  const notificationsEndIndex = pageNumber * PAGE_SIZE;
  const totalPages = Math.ceil(notifications.length / PAGE_SIZE);
  const unreadNotifications = notifications.filter((notification) => !notification.read);

  useEffect(() => {
    dispatch(fetchNotifications({
      currentVersion: version
    }));
  }, []);

  useEffect(() => {
    reset();
  }, [showNotificationsModal]);

  useEffect(() => {
    if (!selectedNotification && notifications?.length > 0 && showNotificationsModal) {
      let firstNotification = notifications[0];
      setSelectedNotification(firstNotification);
      dispatch(markNotificationAsRead({ notificationId: firstNotification?.id }));
    }
  }, [notifications, selectedNotification, showNotificationsModal]);

  const reset = () => {
    setSelectedNotification(null);
    setPageNumber(1);
  };

  const handlePrev = (e) => {
    if (pageNumber - 1 < 1) return;
    setPageNumber(pageNumber - 1);
  };

  const handleNext = (e) => {
    if (pageNumber + 1 > totalPages) return;
    setPageNumber(pageNumber + 1);
  };

  const handleNotificationItemClick = (notification) => (e) => {
    e.preventDefault();
    setSelectedNotification(notification);
    dispatch(markNotificationAsRead({ notificationId: notification?.id }));
  };

  const getSanitizedDescription = (description) => {
    return DOMPurify.sanitize(encodeURIComponent(description), {
      ALLOWED_TAGS: ['a', 'ul', 'img', 'li', 'div', 'span', 'p', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6'],
      ALLOWED_ATTR: ['href', 'style', 'target', 'src', 'alt']
    });
  };

  const modalCustomHeader = (
    <div className="flex flex-row gap-8">
      <div className="bruno-modal-header-title">NOTIFICATIONS</div>
      {unreadNotifications.length > 0 && (
        <>
          <div className="normal-case font-normal">
            {unreadNotifications.length} <span>unread notifications</span>
          </div>
          <button
            className={`select-none ${1 == 2 ? 'opacity-50' : 'text-link mark-as-read cursor-pointer hover:underline'}`}
            onClick={() => dispatch(markAllNotificationsAsRead())}
          >
            Mark all as read
          </button>
        </>
      )}
    </div>
  );

  return (
    <StyledWrapper>
      <a
        className="relative cursor-pointer"
        onClick={() => {
          dispatch(fetchNotifications({
            currentVersion: version
          }));
          setShowNotificationsModal(true);
        }}
        aria-label="Check all Notifications"
      >
        <ToolHint text="Notifications" toolhintId="Notifications" offset={8}>
          <IconBell
            size={16}
            aria-hidden
            strokeWidth={1.5}
            className={`${unreadNotifications?.length > 0 ? 'bell' : ''}`}
          />
          {unreadNotifications.length > 0 && (
            <span className="notification-count text-xs">{unreadNotifications.length}</span>
          )}
        </ToolHint>
      </a>

      {showNotificationsModal && (
        <Portal>
          <Modal
            size="lg"
            title="Notifications"
            confirmText="Close"
            handleConfirm={() => {
              setShowNotificationsModal(false);
            }}
            handleCancel={() => {
              setShowNotificationsModal(false);
            }}
            hideFooter={true}
            customHeader={modalCustomHeader}
            disableCloseOnOutsideClick={true}
            disableEscapeKey={true}
          >
            <div className="notifications-modal">
              {notifications?.length > 0 ? (
                <div className="grid grid-cols-4 flex flex-row">
                  <div className="col-span-1 flex flex-col">
                    <ul
                      className="notifications w-full flex flex-col h-[50vh] max-h-[50vh] overflow-y-auto"
                      style={{ maxHeight: '50vh', height: '46vh' }}
                    >
                      {notifications?.slice(notificationsStartIndex, notificationsEndIndex)?.map((notification) => (
                        <li
                          key={notification.id}
                          className={`p-4 flex flex-col justify-center ${
                            selectedNotification?.id == notification.id ? 'active' : notification.read ? 'read' : ''
                          }`}
                          onClick={handleNotificationItemClick(notification)}
                        >
                          <div className="notification-title w-full">{notification?.title}</div>
                          <div className="notification-date text-xs py-2">{relativeDate(notification?.date)}</div>
                        </li>
                      ))}
                    </ul>
                    <div className="w-full pagination flex flex-row gap-4 justify-center p-2 items-center text-xs">
                      <button
                        className={`pl-2 pr-2 py-3 select-none ${
                          pageNumber <= 1 ? 'opacity-50' : 'text-link cursor-pointer hover:underline'
                        }`}
                        onClick={handlePrev}
                      >
                        Prev
                      </button>
                      <div className="flex flex-row items-center justify-center gap-1">
                        Page
                        <div className="w-[20px] flex justify-center" style={{ width: '20px' }}>
                          {pageNumber}
                        </div>
                        of
                        <div className="w-[20px] flex justify-center" style={{ width: '20px' }}>
                          {totalPages}
                        </div>
                      </div>
                      <button
                        className={`pl-2 pr-2 py-3 select-none ${
                          pageNumber == totalPages ? 'opacity-50' : 'text-link cursor-pointer hover:underline'
                        }`}
                        onClick={handleNext}
                      >
                        Next
                      </button>
                    </div>
                  </div>
                  <div className="flex w-full col-span-3 p-4 flex-col">
                    <div className="w-full text-lg flex flex-wrap h-fit mb-1">{selectedNotification?.title}</div>
                    <div className="w-full notification-date text-xs mb-4">
                      {humanizeDate(selectedNotification?.date)}
                    </div>
                    <iframe
                      src={`data:text/html,${getSanitizedDescription(selectedNotification?.description)}`}
                      sandbox="allow-popups"
                      style={{ width: '100%', height: '100%' }}
                    >
                    </iframe>
                  </div>
                </div>
              ) : (
                <div className="opacity-50 italic text-xs p-12 flex justify-center">You are all caught up!</div>
              )}
            </div>
          </Modal>
        </Portal>
      )}
    </StyledWrapper>
  );
};

export default Notifications;