import React, { useState, useEffect, useRef, useCallback } from "react";
import { Link } from "react-router-dom";
import axios from "axios";
import { isAutheticated } from "src/auth";
import swal from "sweetalert";
import debounce from "lodash.debounce";

const Inventory = () => {
  const token = isAutheticated();
  const [loading, setLoading] = useState(false);
  const [inventoryData, setInventoryData] = useState([]);

  const nameRef = useRef();
  const startDateRef = useRef();
  const endDateRef = useRef();

  const [currentPage, setCurrentPage] = useState(1);
  const [itemPerPage, setItemPerPage] = useState(10);
  const [totalData, setTotalData] = useState(0);

  const getInventoryData = async () => {
    setLoading(true);
    try {
      const response = await axios.get(`api/inventory/all`, {
        headers: {
          Authorization: `Bearer ${token}`,
        },
        params: {
          page: currentPage,
          show: itemPerPage,
          startDate: startDateRef.current?.value || "",
          endDate: endDateRef.current?.value || "",
          name: nameRef.current?.value || "",
        },
      });

      const transformedData =
        response.data?.inventories?.map((entry) => ({
          id: entry._id,
          uniqueId: entry.uniqueId,
          tradeName:
            entry.addedForData?.shippingAddress?.tradeName ||
            entry.addedForData?.trade_name ||
            "N/A",
          designation: entry.addedFor === "PrincipalDistributor" ? "PD" : "RD",
          products: entry.products.map((product) => ({
            SKU: product.SKU,
            ProductName: product.ProductName,
            Sale: product.Sale,
            Inventory: product.Inventory,
          })),
          createdAt: entry.createdAt,
          updatedAt: entry.updatedAt,
        })) || [];

      setInventoryData(transformedData);
      setTotalData(response.data?.total_data || 0);
    } catch (err) {
      const msg = err?.response?.data?.msg || "Something went wrong!";
      swal({
        title: "Error",
        text: msg,
        icon: "error",
        button: "Retry",
        dangerMode: true,
      });
    } finally {
      setLoading(false);
    }
  };

  const debouncedSearch = useCallback(
    debounce(() => {
      setCurrentPage(1);
      getInventoryData();
    }, 500),
    []
  );

  const handleSearchChange = () => {
    debouncedSearch();
  };

  useEffect(() => {
    getInventoryData();
  }, [itemPerPage, currentPage]);

  return (
    <div className="main-content">
      <div className="page-content">
        <div className="container-fluid">
          <div className="row">
            <div className="col-12">
              <div
                className="
                    page-title-box
                    d-flex
                    align-items-center
                    justify-content-between
                  "
              >
                <div style={{ fontSize: "22px" }} className="fw-bold">
                  Inventory List
                </div>
              </div>
            </div>
          </div>

          <div className="row">
            <div className="col-lg-12">
              <div className="card">
                <div className="card-body">
                  <div className="row ml-0 mr-0 mb-10">
                    <div className="col-lg-1">
                      <div className="dataTables_length">
                        <label className="w-100">
                          Show
                          <select
                            onChange={(e) => {
                              setItemPerPage(e.target.value);
                              setCurrentPage(1);
                            }}
                            className="form-control"
                            disabled={loading}
                          >
                            <option value="10">10</option>
                            <option value="25">25</option>
                            <option value="50">50</option>
                            <option value="100">100</option>
                          </select>
                          entries
                        </label>
                      </div>
                    </div>
                    <div className="col-lg-3">
                      <label>Trade Name:</label>
                      <input
                        type="text"
                        placeholder="Trade name"
                        className="form-control"
                        ref={nameRef}
                        onChange={handleSearchChange}
                        disabled={loading}
                      />
                    </div>
                    <div className="col-lg-3">
                      <label>Start Date:</label>
                      <input
                        type="date"
                        className="form-control"
                        ref={startDateRef}
                        onChange={handleSearchChange}
                        disabled={loading}
                      />
                    </div>
                    <div className="col-lg-3">
                      <label>End Date:</label>
                      <input
                        type="date"
                        className="form-control"
                        ref={endDateRef}
                        onChange={handleSearchChange}
                        disabled={loading}
                      />
                    </div>
                  </div>

                  <div className="table-responsive table-shoot mt-3">
                    <table
                      className="table table-centered table-nowrap"
                      style={{
                        border: "1px solid",
                        borderCollapse: "collapse",
                      }} // Ensure borders collapse for clean lines
                    >
                      <thead
                        className="thead-light"
                        style={{ background: "#ecdddd" }}
                      >
                        <tr>
                          <th
                            className="text-start"
                            style={{ border: "1px solid" }}
                          >
                            ID
                          </th>
                          <th
                            className="text-start"
                            style={{ border: "1px solid" }}
                          >
                            Date
                          </th>
                          <th
                            className="text-start"
                            style={{ border: "1px solid" }}
                          >
                            Time
                          </th>
                          <th
                            className="text-start"
                            style={{ border: "1px solid" }}
                          >
                            Trade Name
                          </th>
                          <th
                            className="text-start"
                            style={{ border: "1px solid" }}
                          >
                            PD/RD
                          </th>
                          <th
                            className="text-start"
                            style={{ border: "1px solid" }}
                          >
                            Product SKU
                          </th>
                          <th
                            className="text-start"
                            style={{ border: "1px solid" }}
                          >
                            Product Name
                          </th>
                          <th
                            className="text-start"
                            style={{ border: "1px solid" }}
                          >
                            Sale
                          </th>
                          <th
                            className="text-start"
                            style={{ border: "1px solid" }}
                          >
                            Inventory
                          </th>
                          <th
                            className="text-start"
                            style={{ border: "1px solid" }}
                          >
                            Actions
                          </th>
                        </tr>
                      </thead>

                      <tbody>
                        {loading ? (
                          <tr>
                            <td
                              className="text-center"
                              colSpan="10"
                              style={{ border: "1px solid" }}
                            >
                              Loading...
                            </td>
                          </tr>
                        ) : inventoryData.length > 0 ? (
                          inventoryData.map((entry, i) =>
                            entry.products.map((product, j) => (
                              <tr key={`${i}-${j}`}>
                                {/* Only show ID, Date, Time, Trade Name, PD/RD, and Actions on the first row of each entry */}
                                {j === 0 && (
                                  <>
                                    <td
                                      className="text-start"
                                      rowSpan={entry.products.length}
                                      style={{ border: "1px solid" }}
                                    >
                                      {entry.uniqueId}
                                    </td>
                                    <td
                                      className="text-start"
                                      rowSpan={entry.products.length}
                                      style={{ border: "1px solid" }}
                                    >
                                      {new Date(entry.createdAt).toLocaleString(
                                        "en-IN",
                                        {
                                          month: "short",
                                          day: "numeric",
                                          year: "numeric",
                                        }
                                      )}
                                    </td>
                                    <td
                                      className="text-start"
                                      rowSpan={entry.products.length}
                                      style={{ border: "1px solid" }}
                                    >
                                      {new Date(entry.createdAt).toLocaleString(
                                        "en-IN",
                                        {
                                          hour: "numeric",
                                          minute: "numeric",
                                          hour12: true,
                                        }
                                      )}
                                    </td>
                                    <td
                                      className="text-start"
                                      rowSpan={entry.products.length}
                                      style={{ border: "1px solid" }}
                                    >
                                      {entry.tradeName}
                                    </td>
                                    <td
                                      className="text-start"
                                      rowSpan={entry.products.length}
                                      style={{ border: "1px solid" }}
                                    >
                                      {entry.designation}
                                    </td>
                                  </>
                                )}
                                {/* Product details */}
                                <td
                                  className="text-start"
                                  style={{ border: "1px solid" }}
                                >
                                  {product.SKU}
                                </td>
                                <td
                                  className="text-start"
                                  style={{ border: "1px solid" }}
                                >
                                  {product.ProductName}
                                </td>
                                <td
                                  className="text-start"
                                  style={{ border: "1px solid" }}
                                >
                                  {product.Sale}
                                </td>
                                <td
                                  className="text-start"
                                  style={{ border: "1px solid" }}
                                >
                                  {product.Inventory}
                                </td>
                                {/* Actions: only show on the first row of each entry */}
                                {j === 0 && (
                                  <td
                                    className="text-start"
                                    rowSpan={entry.products.length}
                                    style={{ border: "1px solid" }}
                                  >
                                    <Link
                                      to={`/inventory/view/${entry.id}`}
                                      state={{ product }}
                                    >
                                      <button
                                        style={{
                                          color: "white",
                                          marginRight: "1rem",
                                        }}
                                        type="button"
                                        className="btn btn-primary btn-sm waves-effect waves-light btn-table mx-1 mt-1"
                                      >
                                        View
                                      </button>
                                    </Link>
                                  </td>
                                )}
                              </tr>
                            ))
                          )
                        ) : (
                          <tr className="text-center">
                            <td colSpan="10" style={{ border: "1px solid" }}>
                              <h5>No Data Available...</h5>
                            </td>
                          </tr>
                        )}
                      </tbody>
                    </table>
                  </div>
                  <div className="row mt-20">
                    <div className="col-sm-12 col-md-6 mb-20">
                      <div
                        className="dataTables_info"
                        id="datatable_info"
                        role="status"
                        aria-live="polite"
                      >
                        Showing {currentPage * itemPerPage - itemPerPage + 1} to{" "}
                        {Math.min(currentPage * itemPerPage, totalData)} of{" "}
                        {totalData} entries
                      </div>
                    </div>

                    <div className="col-sm-12 col-md-6">
                      <div className="d-flex">
                        <ul className="pagination ms-auto">
                          <li
                            className={
                              currentPage === 1
                                ? "paginate_button page-item previous disabled"
                                : "paginate_button page-item previous"
                            }
                          >
                            <span
                              className="page-link"
                              style={{ cursor: "pointer" }}
                              onClick={() => setCurrentPage((prev) => prev - 1)}
                              disabled={loading}
                            >
                              Previous
                            </span>
                          </li>

                          {!(currentPage - 1 < 1) && (
                            <li className="paginate_button page-item">
                              <span
                                className="page-link"
                                style={{ cursor: "pointer" }}
                                onClick={(e) =>
                                  setCurrentPage((prev) => prev - 1)
                                }
                                disabled={loading}
                              >
                                {currentPage - 1}
                              </span>
                            </li>
                          )}

                          <li className="paginate_button page-item active">
                            <span
                              className="page-link"
                              style={{ cursor: "pointer" }}
                            >
                              {currentPage}
                            </span>
                          </li>

                          {!(
                            (currentPage + 1) * itemPerPage - itemPerPage >
                            totalData - 1
                          ) && (
                            <li className="paginate_button page-item ">
                              <span
                                className="page-link"
                                style={{ cursor: "pointer" }}
                                onClick={() => {
                                  setCurrentPage((prev) => prev + 1);
                                }}
                                disabled={loading}
                              >
                                {currentPage + 1}
                              </span>
                            </li>
                          )}

                          <li
                            className={
                              !(
                                (currentPage + 1) * itemPerPage - itemPerPage >
                                totalData - 1
                              )
                                ? "paginate_button page-item next"
                                : "paginate_button page-item next disabled"
                            }
                          >
                            <span
                              className="page-link"
                              style={{ cursor: "pointer" }}
                              onClick={() => setCurrentPage((prev) => prev + 1)}
                              disabled={loading}
                            >
                              Next
                            </span>
                          </li>
                        </ul>
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
};

export default Inventory;