import React, { useCallback, useEffect, useState } from "react";
import Avatar from "../common/Avatar";
import { convertShortTime } from "../../utils/dateUtils";
import RegularizationActions from "./RegularizationActions";
import { useSelector } from "react-redux";
import { useRegularizationRequests } from "../../hooks/useAttendance";
import moment from "moment";
import usePagination from "../../hooks/usePagination";
import eventBus from "../../services/eventBus";
import { cacheData } from "../../slices/apiDataManager";

const Regularization = ({ handleRequest, searchQuery }) => {
  const selectedProject = useSelector((store) => store.localVariables.projectId);
  const [regularizesList, setRegularizedList] = useState([]);
  const { regularizes, loading, refetch } = useRegularizationRequests(selectedProject);

  // Update regularizesList when regularizes data changes
  useEffect(() => {
    setRegularizedList(regularizes);
  }, [regularizes]);

  const sortByName = useCallback((a, b) => {
    const nameA = (a.firstName + a.lastName).toLowerCase();
    const nameB = (b.firstName + b.lastName).toLowerCase();
    return nameA.localeCompare(nameB);
  }, []);

  const handler = useCallback(
    (msg) => {
      if (selectedProject === msg.projectId) { // Use strict equality for comparison
        // Filter out the updated item to effectively remove it from the list
        // as it's likely been processed (approved/rejected)
        const updatedAttendance = regularizesList?.filter(item => item.id !== msg.response.id);
        cacheData("regularizedList", {
          data: updatedAttendance,
          projectId: selectedProject,
        });
        // Refetch to get the latest data from the source, ensuring consistency
        refetch();
      }
    },
    [selectedProject, regularizesList, refetch] // Added regularizesList and refetch to dependencies
  );

  const employeeHandler = useCallback(
    (msg) => {
      // If any regularization request belongs to the updated employee, refetch
      if (regularizes?.some((item) => item.employeeId === msg.employeeId)) { // Use strict equality
        refetch();
      }
    },
    [regularizes, refetch] // Added refetch to dependencies
  );

  // Event bus listeners
  useEffect(() => {
    eventBus.on("regularization", handler);
    return () => eventBus.off("regularization", handler);
  }, [handler]);

  useEffect(() => {
    eventBus.on("employee", employeeHandler);
    return () => eventBus.off("employee", employeeHandler);
  }, [employeeHandler]);

  // Search filter logic
  const filteredData = [...regularizesList]
    ?.filter((item) => {
      if (!searchQuery) return true;
      const lowerSearch = searchQuery.toLowerCase();
      const fullName = `${item.firstName || ""} ${item.lastName || ""}`.toLowerCase();

      return (
        item.firstName?.toLowerCase().includes(lowerSearch) ||
        item.lastName?.toLowerCase().includes(lowerSearch) ||
        fullName.includes(lowerSearch) ||
        item.employeeId?.toLowerCase().includes(lowerSearch)
      );
    })
    .sort(sortByName);

  const { currentPage, totalPages, currentItems, paginate } = usePagination(filteredData, 20);

  return (
    <div className="table-responsive text-nowrap pb-4">
      <table className="table mb-0">
        <thead>
          <tr>
            <th colSpan={2}>Name</th>
            <th>Date</th>
            <th>
              <i className="bx bxs-down-arrow-alt text-success"></i>Check-In
            </th>
            <th>
              <i className="bx bxs-up-arrow-alt text-danger"></i>Check-Out
            </th>
            <th>Action</th>
          </tr>
        </thead>
        <tbody>
          {!loading && currentItems?.length > 0 ? (
            currentItems.map((att, index) => (
              <tr key={index}>
                <td colSpan={2}>
                  <div className="d-flex justify-content-start align-items-center">
                    <Avatar firstName={att.firstName} lastName={att.lastName} />
                    <div className="d-flex flex-column">
                      <a href="#" className="text-heading text-truncate">
                        <span className="fw-normal">
                          {att.firstName} {att.lastName}
                        </span>
                      </a>
                    </div>
                  </div>
                </td>
                <td>{moment(att.checkOutTime).format("DD-MMM-YYYY")}</td>
                <td>{convertShortTime(att.checkInTime)}</td>
                <td>
                  {att.checkOutTime ? convertShortTime(att.checkOutTime) : "--"}
                </td>
                <td className="text-center">
                  <RegularizationActions
                    attendanceData={att}
                    handleRequest={handleRequest}
                    refresh={refetch}
                  />
                </td>
              </tr>
            ))
          ) : (
            <tr>
              <td
                colSpan={6}
                className="text-center"
                style={{
                  height: "200px",
                  verticalAlign: "middle",
                  borderBottom: "none",
                }}
              >
                {loading ? "Loading..." : "No Record Found"}
              </td>
            </tr>
          )}
        </tbody>
      </table>

      {!loading && totalPages > 1 && (
        <nav aria-label="Page ">
          <ul className="pagination pagination-sm justify-content-end py-1 mt-3">
            <li className={`page-item  ${currentPage === 1 ? "disabled" : ""}`}>
              <button
                className="page-link btn-xs"
                onClick={() => paginate(currentPage - 1)}
              >
                &laquo;
              </button>
            </li>
            {[...Array(totalPages)].map((_, index) => (
              <li
                key={index}
                className={`page-item ${currentPage === index + 1 ? "active" : ""}`}
              >
                <button className="page-link" onClick={() => paginate(index + 1)}>
                  {index + 1}
                </button>
              </li>
            ))}
            <li
              className={`page-item ${currentPage === totalPages ? "disabled" : ""}`}
            >
              <button
                className="page-link"
                onClick={() => paginate(currentPage + 1)}
              >
                &raquo;
              </button>
            </li>
          </ul>
        </nav>
      )}
    </div>
  );
};

export default Regularization;