import React, { useState, useEffect, useRef, useCallback } from "react";
import moment from "moment";
import showToast from "../../services/toastService";
import { Link, NavLink, useNavigate } from "react-router-dom";
import Avatar from "../../components/common/Avatar";
import Breadcrumb from "../../components/common/Breadcrumb";
import ManageEmp from "../../components/Employee/ManageRole";
import {
  useEmployeesAllOrByProjectId,
  useSuspendEmployee,
} from "../../hooks/useEmployees";
import { useProjectName, useProjects } from "../../hooks/useProjects";
import { useProfile } from "../../hooks/useProfile";
import { hasUserPermission } from "../../utils/authUtils";
import {
  ITEMS_PER_PAGE,
  MANAGE_EMPLOYEES,
  VIEW_ALL_EMPLOYEES,
  VIEW_TEAM_MEMBERS,
} from "../../utils/constants";
import { clearCacheKey } from "../../slices/apiDataManager";
import { useHasUserPermission } from "../../hooks/useHasUserPermission";
import SuspendEmp from "../../components/Employee/SuspendEmp"; // Keep if you use SuspendEmp
import {
  exportToCSV,
  exportToExcel,
  printTable,
  exportToPDF,
} from "../../utils/tableExportUtils";
import EmployeeRepository from "../../repositories/EmployeeRepository";
import ManageEmployee from "../../components/Employee/ManageEmployee";
import ConfirmModal from "../../components/common/ConfirmModal";
import { useDispatch, useSelector } from "react-redux";
import eventBus from "../../services/eventBus";
import { newlineChars } from "pdf-lib";
import GlobalModel from "../../components/common/GlobalModel";
import usePagination from "../../hooks/usePagination";
import { setProjectId } from "../../slices/localVariablesSlice";

const EmployeeList = () => {
  const selectedProjectId = useSelector(
    (store) => store.localVariables.projectId
  );
  const { projectNames, loading: projectLoading, fetchData } = useProjectName();

  const dispatch = useDispatch();

  const [showInactive, setShowInactive] = useState(false);
  const [showAllEmployees, setShowAllEmployees] = useState(false);
  const Manage_Employee = useHasUserPermission(MANAGE_EMPLOYEES);

  const { employees, loading, setLoading, error, recallEmployeeData } =
    useEmployeesAllOrByProjectId(
      showAllEmployees,
      selectedProjectId,
      showInactive
    );

  const [employeeList, setEmployeeList] = useState([]);
  const [modelConfig, setModelConfig] = useState();
  const [EmpForManageRole, setEmpForManageRole] = useState(null);
  // const [currentPage, setCurrentPage] = useState(1);
  // const [itemsPerPage] = useState(ITEMS_PER_PAGE);
  const [isCreateModalOpen, setIsCreateModalOpen] = useState(false);
  const [searchText, setSearchText] = useState("");
  const [filteredData, setFilteredData] = useState([]);
  const [showModal, setShowModal] = useState(false);
  const [selectedEmployeeId, setSelecedEmployeeId] = useState(null);
  const [IsDeleteModalOpen, setIsDeleteModalOpen] = useState(false);
  const [selectedEmpFordelete, setSelectedEmpFordelete] = useState(null);
  const [employeeLodaing, setemployeeLodaing] = useState(false);
  const ViewTeamMember = useHasUserPermission(VIEW_TEAM_MEMBERS);
  const ViewAllEmployee = useHasUserPermission(VIEW_ALL_EMPLOYEES);
  const { mutate: suspendEmployee, isPending: empLodaing } = useSuspendEmployee(
    {
      setIsDeleteModalOpen,
      setemployeeLodaing,
    }
  );

  useEffect(() => {
    if (selectedProjectId === null) {
      dispatch(setProjectId(projectNames[0]?.id));
    }
  }, [selectedProjectId]);
  const navigate = useNavigate();

  const applySearchFilter = (data, text) => {
    if (!text) {
      return data;
    }

    const lowercasedText = text.toLowerCase().trim();

    return data.filter((item) => {
      const firstName = item.firstName || "";
      const middleName = item.middleName || "";
      const lastName = item.lastName || "";

      const fullName = `${firstName} ${middleName} ${lastName}`
        .toLowerCase()
        .trim()
        .replace(/\s+/g, " ");

      const email = item.email?.toLowerCase() || "";
      const phoneNumber = item.phoneNumber?.toLowerCase() || "";
      const jobRole = item.jobRole?.toLowerCase() || "";

      return (
        fullName.includes(lowercasedText) ||
        email.includes(lowercasedText) ||
        phoneNumber.includes(lowercasedText) ||
        jobRole.includes(lowercasedText)
      );
    });
  };

  const handleSearch = (e) => {
    const value = e.target.value;
    setSearchText(value);
    setCurrentPage(1);
  };

  const displayData = searchText ? filteredData : employeeList;
  const { currentPage, totalPages, currentItems, paginate, setCurrentPage } =
    usePagination(displayData, ITEMS_PER_PAGE);
  const openModal = () => {
    setIsCreateModalOpen(true);
  };

  const handleConfigData = (config) => {
    setModelConfig(config);
  };

  const tableRef = useRef(null);
  const handleExport = (type) => {
    if (!currentItems || currentItems.length === 0) return;

    switch (type) {
      case "csv":
        exportToCSV(currentItems, "employees");
        break;
      case "excel":
        exportToExcel(currentItems, "employees");
        break;
      case "pdf":
        exportToPDF(currentItems, "employees");
        break;
      case "print":
        printTable(tableRef.current);
        break;
      default:
        break;
    }
  };

  const handleAllEmployeesToggle = (e) => {
    const isChecked = e.target.checked;
    setShowInactive(false);
    setShowAllEmployees(isChecked);
  };

  const handleEmployeeModel = (id) => {
    setSelecedEmployeeId(id);
    setShowModal(true);
  };

  const handleOpenDelete = (employee) => {
    setSelectedEmpFordelete(employee);
    setIsDeleteModalOpen(true);
  };
  useEffect(() => {
    const filtered = applySearchFilter(employeeList, searchText);
    setFilteredData(filtered);
  }, [searchText, employeeList]);
  useEffect(() => {
    if (!loading && Array.isArray(employees)) {
      const sorted = [...employees].sort((a, b) => {
        const nameA = `${a.firstName || ""}${a.middleName || ""}${
          a.lastName || ""
        }`.toLowerCase();
        const nameB = `${b.firstName || ""}${b.middleName || ""}${
          b.lastName || ""
        }`.toLowerCase();
        return nameA?.localeCompare(nameB);
      });

      setEmployeeList((prevList) => {
        const prevJSON = JSON.stringify(prevList);
        const nextJSON = JSON.stringify(sorted);
        if (prevJSON !== nextJSON) {
          return sorted;
        }
        return prevList;
      });

      setFilteredData((prev) => {
        const prevJSON = JSON.stringify(prev);
        const nextJSON = JSON.stringify(sorted);
        if (prevJSON !== nextJSON) {
          return sorted;
        }
        return prev;
      });

      setCurrentPage((prevPage) => (prevPage !== 1 ? 1 : prevPage));
    }
  }, [loading, employees, selectedProjectId, showAllEmployees]);

  useEffect(() => {
    if (!showAllEmployees) {
      recallEmployeeData(showInactive, selectedProjectId);
    }
  }, [selectedProjectId, showInactive, showAllEmployees, recallEmployeeData]);

  const handler = useCallback(
    (msg) => {
      if (employees.some((item) => item.id == msg.employeeId)) {
        setEmployeeList([]);
        recallEmployeeData(
          showInactive,
          showAllEmployees ? null : selectedProjectId
        ); // Use selectedProjectId here
      }
    },
    [employees, showInactive, showAllEmployees, selectedProjectId] // Add all relevant dependencies
  );

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

  return (
    <>
      {EmpForManageRole && (
        <GlobalModel
          isOpen={EmpForManageRole}
          closeModal={() => setEmpForManageRole(null)}
        >
          <ManageEmp
            employeeId={EmpForManageRole}
            onClosed={() => setEmpForManageRole(null)}
          />
        </GlobalModel>
      )}

      {showModal && (
        <GlobalModel
          isOpen={showModal}
          size="lg"
          closeModal={() => setShowModal(false)}
        >
          <ManageEmployee
            employeeId={selectedEmployeeId}
            onClosed={() => setShowModal(false)}
            IsAllEmployee={showAllEmployees}
          />
        </GlobalModel>
      )}

      {IsDeleteModalOpen && (
        <div
          className={`modal fade  ${IsDeleteModalOpen ? "show" : ""}`}
          tabIndex="-1"
          role="dialog"
          style={{
            display: IsDeleteModalOpen ? "block" : "none",
            backgroundColor: IsDeleteModalOpen
              ? "rgba(0,0,0,0.5)"
              : "transparent",
          }}
          aria-hidden="false"
        >
          <ConfirmModal
            type={"delete"}
            header={"Suspend Employee"}
            message={"Are you sure you want delete?"}
            onSubmit={suspendEmployee}
            onClose={() => setIsDeleteModalOpen(false)}
            loading={employeeLodaing}
            paramData={selectedEmpFordelete}
          />
        </div>
      )}

      <div className="container-fluid">
        <Breadcrumb
          data={[
            { label: "Home", link: "/dashboard" },
            { label: "Employees", link: null },
          ]}
        ></Breadcrumb>

        {ViewTeamMember ? (
          // <div className="row">
          <div className="card p-1">
            <div className="card-datatable table-responsive pt-2">
              <div
                id="DataTables_Table_0_wrapper"
                className="dataTables_wrapper dt-bootstrap5 no-footer"
                style={{ width: "98%" }}
              >
                <div className="d-flex flex-wrap align-items-center justify-content-between gap-3 mb-3">
                  {/* Switches: All Employees + Inactive */}
                  <div className="d-flex flex-wrap align-items-center gap-3">
                    {/* All Employees Switch */}
                    {ViewAllEmployee && (
                      <div className="form-check form-switch text-start">
                        <input
                          type="checkbox"
                          className="form-check-input"
                          role="switch"
                          id="allEmployeesCheckbox"
                          checked={showAllEmployees}
                          onChange={handleAllEmployeesToggle}
                        />
                        <label
                          className="form-check-label ms-0"
                          htmlFor="allEmployeesCheckbox"
                        >
                          All Employees
                        </label>
                      </div>
                    )}

                    {/* Show Inactive Employees Switch */}
                    {showAllEmployees && (
                      <div className="form-check form-switch text-start">
                        <input
                          type="checkbox"
                          className="form-check-input"
                          role="switch"
                          id="inactiveEmployeesCheckbox"
                          checked={showInactive}
                          onChange={(e) => setShowInactive(e.target.checked)}
                        />
                        <label
                          className="form-check-label ms-0"
                          htmlFor="inactiveEmployeesCheckbox"
                        >
                          Show Inactive Employees
                        </label>
                      </div>
                    )}
                  </div>

                  {/* Right side: Search + Export + Add Employee */}
                  <div className="d-flex flex-wrap align-items-center justify-content-end gap-3 flex-grow-1">
                    {/* Search Input - ALWAYS ENABLED */}
                    <div className="dataTables_filter">
                      <label className="mb-0">
                        <input
                          type="search"
                          value={searchText}
                          onChange={handleSearch}
                          className="form-control form-control-sm"
                          placeholder="Search User"
                          aria-controls="DataTables_Table_0"
                        />
                      </label>
                    </div>

                    {/* Export Dropdown */}
                    <div className="dropdown">
                      <button
                        aria-label="Click me"
                        className="btn btn-sm btn-label-secondary dropdown-toggle"
                        type="button"
                        data-bs-toggle="dropdown"
                        aria-expanded="false"
                      >
                        <i className="bx bx-export me-2 bx-sm"></i>Export
                      </button>
                      <ul className="dropdown-menu">
                        <li>
                          <a
                            className="dropdown-item"
                            href="#"
                            onClick={() => handleExport("print")}
                          >
                            <i className="bx bx-printer me-1"></i> Print
                          </a>
                        </li>
                        <li>
                          <a
                            className="dropdown-item"
                            href="#"
                            onClick={() => handleExport("csv")}
                          >
                            <i className="bx bx-file me-1"></i> CSV
                          </a>
                        </li>
                        <li>
                          <a
                            className="dropdown-item"
                            href="#"
                            onClick={() => handleExport("excel")}
                          >
                            <i className="bx bxs-file-export me-1"></i> Excel
                          </a>
                        </li>
                        <li>
                          <a
                            className="dropdown-item"
                            href="#"
                            onClick={() => handleExport("pdf")}
                          >
                            <i className="bx bxs-file-pdf me-1"></i> PDF
                          </a>
                        </li>
                      </ul>
                    </div>

                    {/* Add Employee Button */}
                    {Manage_Employee && (
                      <button
                        className="btn btn-sm btn-primary"
                        type="button"
                        onClick={() => handleEmployeeModel(null)}
                      >
                        <i className="bx bx-plus-circle me-2"></i>
                        <span className="d-none d-md-inline-block">
                          Add New Employee
                        </span>
                      </button>
                    )}
                  </div>
                </div>

                <table
                  className="datatables-users table border-top dataTable no-footer dtr-column text-nowrap"
                  id="DataTables_Table_0"
                  aria-describedby="DataTables_Table_0_info"
                  style={{ width: "100%" }}
                  ref={tableRef}
                >
                  <thead>
                    <tr>
                      <th
                        className="sorting sorting_desc"
                        tabIndex="0"
                        aria-controls="DataTables_Table_0"
                        rowSpan="1"
                        colSpan="2"
                        aria-label="User: activate to sort column ascending"
                        aria-sort="descending"
                      >
                        <div className="text-start ms-6">Name</div>
                      </th>
                      <th
                        className="sorting sorting_desc d-none d-sm-table-cell"
                        tabIndex="0"
                        aria-controls="DataTables_Table_0"
                        rowSpan="1"
                        colSpan="1"
                        aria-label="User: activate to sort column ascending"
                        aria-sort="descending"
                      >
                        <div className="text-start ms-5">Email</div>
                      </th>
                      <th
                        className="sorting sorting_desc d-none d-sm-table-cell"
                        tabIndex="0"
                        aria-controls="DataTables_Table_0"
                        rowSpan="1"
                        colSpan="1"
                        aria-label="User: activate to sort column ascending"
                        aria-sort="descending"
                      >
                        <div className="text-start ms-5">Contact</div>
                      </th>
                      <th
                        className="sorting sorting_desc  d-none  d-sm-table-cell"
                        tabIndex="0"
                        aria-controls="DataTables_Table_0"
                        rowSpan="1"
                        colSpan="1"
                        aria-label="User: activate to sort column ascending"
                        aria-sort="descending"
                      >
                        <div className="text-start ms-5">
                          Official Designation
                        </div>
                      </th>

                      <th
                        className="sorting  d-none  d-md-table-cell"
                        tabIndex="0"
                        aria-controls="DataTables_Table_0"
                        rowSpan="1"
                        colSpan="1"
                        aria-label="Plan: activate to sort column ascending"
                      >
                        Joining Date
                      </th>
                      <th
                        className="sorting"
                        tabIndex="0"
                        aria-controls="DataTables_Table_0"
                        rowSpan="1"
                        colSpan="1"
                        aria-label="Billing: activate to sort column ascending"
                      >
                        Status
                      </th>
                      <th
                        className={`sorting_disabled  ${
                          !Manage_Employee && "d-none"
                        }`}
                        rowSpan="1"
                        colSpan="1"
                        style={{ width: "50px" }}
                        aria-label="Actions"
                      >
                        Actions
                      </th>
                    </tr>
                  </thead>
                  <tbody>
                    {loading && (
                      <tr>
                        <td colSpan={8}>
                          <p>Loading...</p>
                        </td>
                      </tr>
                    )}
                    {/* Conditional messages for no data or no search results */}
                    {!loading &&
                    displayData?.length === 0 &&
                    searchText &&
                    !showAllEmployees ? (
                      <tr>
                        <td colSpan={8}>
                          <small className="muted">
                            '{searchText}' employee not found
                          </small>{" "}
                        </td>
                      </tr>
                    ) : null}
                    {!loading &&
                    displayData?.length === 0 &&
                    (!searchText || showAllEmployees) ? (
                      <tr>
                        <td
                          colSpan={8}
                          style={{ paddingTop: "20px", textAlign: "center" }}
                        >
                          No Data Found
                        </td>
                      </tr>
                    ) : null}

                    {/* Render current items */}
                    {currentItems &&
                      !loading &&
                      currentItems.map((item) => (
                        <tr className="odd" key={item.id}>
                          <td className="sorting_1" colSpan={2}>
                            <div className="d-flex justify-content-start align-items-center user-name">
                              <Avatar
                                firstName={item.firstName}
                                lastName={item.lastName}
                              ></Avatar>
                              <div className="d-flex flex-column">
                                <a
                                  onClick={() =>
                                    navigate(`/employee/${item.id}`)
                                  }
                                  className="text-heading text-truncate cursor-pointer"
                                >
                                  <span className="fw-normal">
                                    {item.firstName} {item.middleName}{" "}
                                    {item.lastName}
                                  </span>
                                </a>
                              </div>
                            </div>
                          </td>
                          <td className="text-start  d-none  d-sm-table-cell">
                            {item.email ? (
                              <span className="text-truncate">
                                <i className="bx bxs-envelope text-primary me-2"></i>
                                {item.email}
                              </span>
                            ) : (
                              <span className="text-truncate text-italic">
                                NA
                              </span>
                            )}
                          </td>
                          <td className="text-start  d-none  d-sm-table-cell">
                            <span className="text-truncate">
                              <i className="bx bxs-phone-call text-primary me-2"></i>
                              {item.phoneNumber}
                            </span>
                          </td>
                          <td className=" d-none  d-sm-table-cell text-start">
                            <span className="text-truncate">
                              <i className="bx bxs-wrench text-success  me-2"></i>
                              {item.jobRole || "Not Assign Yet"}
                            </span>
                          </td>

                          <td className=" d-none  d-md-table-cell">
                            {moment(item.joiningDate)?.format("DD-MMM-YYYY")}
                          </td>
                          <td>
                            {showInactive ? (
                              <span
                                className="badge bg-label-danger"
                                text-capitalized=""
                              >
                                Inactive
                              </span>
                            ) : (
                              <span
                                className="badge bg-label-success"
                                text-capitalized=""
                              >
                                Active
                              </span>
                            )}
                          </td>
                          {Manage_Employee && (
                            <td className="text-end">
                              <div className="dropdown">
                                <button
                                  className="btn btn-icon dropdown-toggle hide-arrow"
                                  data-bs-toggle="dropdown"
                                >
                                  <i className="bx bx-dots-vertical-rounded bx-md"></i>
                                </button>
                                <div className="dropdown-menu dropdown-menu-end">
                                  <button
                                    onClick={() =>
                                      navigate(`/employee/${item.id}`)
                                    }
                                    className="dropdown-item py-1"
                                  >
                                    <i className="bx bx-detail bx-sm"></i> View
                                  </button>
                                  <button
                                    className="dropdown-item py-1"
                                    onClick={() => {
                                      handleEmployeeModel(item.id);
                                    }}
                                  >
                                    <i className="bx bx-edit bx-sm"></i> Edit
                                  </button>
                                  {!item.isSystem && (
                                    <>
                                      <button
                                        className="dropdown-item py-1"
                                        onClick={() =>
                                          handleOpenDelete(item.id)
                                        }
                                      >
                                        <i className="bx bx-task-x bx-sm"></i>{" "}
                                        Suspend
                                      </button>
                                      <button
                                        className="dropdown-item py-1"
                                        type="button"
                                        data-bs-toggle="modal"
                                        data-bs-target="#managerole-modal"
                                        onClick={() =>
                                          setEmpForManageRole(item.id)
                                        }
                                      >
                                        <i className="bx bx-cog bx-sm"></i>{" "}
                                        Manage Role
                                      </button>
                                    </>
                                  )}
                                </div>
                              </div>
                            </td>
                          )}
                        </tr>
                      ))}
                  </tbody>
                </table>

                <div style={{ width: "1%" }}></div>

                {/* Pagination */}
                {!loading && displayData.length > ITEMS_PER_PAGE && (
                  <nav aria-label="Page">
                    <ul className="pagination pagination-sm justify-content-end py-1">
                      <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>
            </div>
          </div>
        ) : (
          // </div>
          <div className="card">
            <div className="text-center">
              <i className="fa-solid fa-triangle-exclamation fs-5"></i>
              <p>
                Access Denied: You don't have permission to perform this action.
                !
              </p>
            </div>
          </div>
        )}
      </div>
    </>
  );
};

export default EmployeeList;
