import { useState, useEffect, useCallback, useRef, useMemo } from 'react';
import { Form, Input, AutoComplete, Select, Tooltip, Modal } from 'antd';
import { BsUpcScan } from 'react-icons/bs';
import { ArrowRightOutlined, DeleteFilled } from '@ant-design/icons';
import { useDispatch, useSelector } from 'react-redux';
import FormHeader from '../PageComponents/FormHeader.jsx';
import FloatLabel from '../../Components/Forms/FloatLabel/index.jsx';
import { Messages } from '../../Components/Notifications/Messages.jsx';
import Buttons from '../../Components/Forms/Buttons.jsx';
import './CreateTransfer.scss';
import { getPurProdvaraiantdata } from '../../Features/PurchaseOrder/PurchaseOrder.js';
import { getProductDataPageNo } from '../../Features/ProductPage/ProductPage.js';
import { DropDowns } from '../../Components/Forms/DropDown.jsx';
import { getSession } from '../../Services/Others.js';
import { getCompBranchData } from '../../Features/BrachLogin/BranchLogin.js';
import { changeBreadCrumb } from '../../Features/AppPage/CenterPage.js';
import { useLocation, useNavigate } from 'react-router-dom';
import { postRequestStock } from '../../Features/RequestStock/RequestStock.js';
import BarCodeScan from '../../Services/BarCodeScan.jsx';
import { isMobile } from 'react-device-detect';
const subDirectory = import.meta.env.BASE_URL;

function debounce(func, wait) {
  let timeout;
  return function executedFunction(...args) {
    const later = () => {
      clearTimeout(timeout);
      func(...args);
    };
    clearTimeout(timeout);
    timeout = setTimeout(later, wait);
  };
}

const CreateTransfer = () => {
  const dispatch = useDispatch();
  const formProductRef = useRef();
  const productInputRef = useRef(null);
  const location = useLocation();
  const state = location?.state;
  const status = state.transform;
  const navigate = useNavigate();
  const CompId = getSession('CompId');
  const BranchId = getSession('BranchId');
  const AppId = getSession('AppId');
  const UserId = getSession('UserId');

  const [messageType, setMessageType] = useState(null);
  const [messageData, setMessageData] = useState(null);
  const [productSearchText, setProductSearchText] = useState('');
  const [searchText, setSearchText] = useState('');
  const [tableData, setTableData] = useState([]);
  const [scanner, setScanner] = useState(false);
  const [productdata, setProductData] = useState([]);
  const [variantDetails, setVariantDetails] = useState([]);
  const [showVariantModal, setShowVariantModal] = useState(false);
  const [selectedProductForVariant, setSelectedProductForVariant] =
    useState(null);
  const [selectedVariants, setSelectedVariants] = useState([]);
  const [isProcessing, setIsProcessing] = useState(false);
  const [isManualSelection, setIsManualSelection] = useState(false);
  const [branchData, setBranchData] = useState();
  const [selectedBranchId, setSelectedBranchId] = useState();
  const [selectedComponent, setselectedComponent] = useState('Create');
  const items = [
    {
      name: 'Home',
      link: `${subDirectory}app-page/home`,
    },
    {
      name: 'Transfer List',
      link: `${subDirectory}setting/stock-transferlist`,
    },
    {
      name: status === 'Create' ? 'Create' : 'Request ',
      link: null,
    },
  ];

  useEffect(() => {
    dispatch(changeBreadCrumb({ items: items }));
    fetchbranchData();
    fetchProductData();
  }, []);

  const onComplete = useCallback(() => {
    setMessageType(null);
    setMessageData(null);
  }, []);

  const productOptions = useMemo(
    () =>
      productdata?.map((p) => ({
        value: p.ProdId,
        label: p.ProdName,
      })) || [],
    [productdata]
  );

  const filteredTableData = useMemo(() => {
    if (!searchText) return tableData;
    return tableData.filter(
      (item) =>
        item.ProdName?.toLowerCase().includes(searchText.toLowerCase()) ||
        item.ProdVariantName?.toLowerCase().includes(searchText.toLowerCase())
    );
  }, [tableData, searchText]);

  console.log(filteredTableData, 'AaADaAadaadAD');

  const fetchbranchData = async () => {
    const data = {
      AppId: AppId,
      CompId: CompId,
    };
    const res = await dispatch(getCompBranchData(data)).unwrap();
    if (res?.data?.statusCode === 1) {
      const filteredBranches = res?.data?.data?.filter(
        (branch) => branch.BrId !== BranchId
      );
      setBranchData(filteredBranches);
    }
  };
  const fetchProductData = async () => {
    try {
      const ProdData = {
        AppId: AppId,
        CompId: CompId,
        BranchId: BranchId,
      };
      const res = await dispatch(getProductDataPageNo(ProdData)).unwrap();
      if (res?.data?.statusCode === 1) {
        setProductData(res?.data?.data || []);
      } else {
        setMessageType('error');
        setMessageData('Failed to load products');
      }
    } catch (error) {
      console.error('Error fetching products:', error);
      setMessageType('error');
      setMessageData('Error loading products');
    }
  };

  const branchDropDownChange = async (e) => {
    setSelectedBranchId(e);
  };
  const addProductToTable = useCallback((product, variant = null) => {
    const newProduct = {
      ...product,
      ...(variant && {
        ProdVariantId: variant.ProdVariantId,
        ProdVariantName: variant.ProdVariantName,
        InwardDtlId: variant.StockDetails?.[0]?.InwardDtlId,
        MRP: variant.StockDetails?.[0]?.MRP,
        SellPrice: variant.StockDetails?.[0]?.SellPrice,
        OverAllQty: variant.OverAllQty,
      }),
    };

    let success = false;
    setTableData((prev) => {
      const safePrev = Array.isArray(prev) ? prev : [];
      const exists = safePrev.some(
        (p) =>
          p.ProdId === newProduct.ProdId &&
          (variant
            ? p.ProdVariantId === variant.ProdVariantId
            : !p.ProdVariantId)
      );
      if (exists) {
        return safePrev;
      }
      success = true;
      // return [...safePrev, newProduct];
      return [newProduct, ...safePrev];
    });

    if (!success) {
      setMessageType('warning');
      setMessageData(
        variant ? `Already added in the table` : 'This product is already Added'
      );
    }
    if (scanner) {
      setTimeout(() => {
        productInputRef.current?.focus();
        setProductSearchText('');
      }, 100);
    }

    formProductRef?.current?.resetFields();
    if (!scanner) {
      setProductSearchText('');
    }

    return success;
  }, [scanner]);

  const focusProductInput = () => {
    // give React a tick to close modal/input blur before refocusing
    setTimeout(() => productInputRef.current?.focus(), 0);
  };

  const handleProductSearch = (value) => {
    setProductSearchText(value);
    if (scanner && value.length >= 3 && !isManualSelection) {
      debouncedScannerSearch(value);
    }
    if (isManualSelection) {
      setIsManualSelection(false);
    }
  };

  const debouncedScannerSearch = useCallback(
    debounce((value) => {
      handleScannerResult(value);
    }, 300),
    [productdata]
  );

  const handleScannerResult = async (qrCode) => {
    if (isProcessing) return; // Prevent multiple simultaneous processing

    setIsProcessing(true);

    try {
      const selectedProduct = productdata.find(
        (p) => p.QRCode === qrCode || p.ProdId === qrCode
      );

      if (!selectedProduct) {
        setMessageType('error');
        setMessageData('Product not found for scanned code');
        setProductSearchText('');
        return;
      }

      await processSelectedProduct(selectedProduct, true); // Pass true to indicate scanner mode
    } finally {
      setIsProcessing(false);
    }
  };

  const handleProductSelect = async (prodId, option) => {
    if (isProcessing) return;
    setIsManualSelection(true);
    setIsProcessing(true);

    try {
      const selectedProduct = productdata.find((p) => p.ProdId === prodId);

      if (!selectedProduct) {
        setMessageType('error');
        setMessageData('Product not found');
        return;
      }

      await processSelectedProduct(selectedProduct, false);
    } finally {
      setIsProcessing(false);
    }
  };

  const processSelectedProduct = async (selectedProduct, isScanner = false) => {
    if (!selectedProduct) {
      setMessageType('error');
      setMessageData('Product not found');
      return;
    }

    formProductRef.current?.setFieldsValue({ ProdId: selectedProduct.ProdId });
    setProductSearchText(selectedProduct.ProdName);
    setSelectedProductForVariant(selectedProduct);

    try {
      const data = {
        CompId,
        AppId,
        BranchId,
        prodName: selectedProduct.ProdName,
      };

      const variantValues = await dispatch(
        getPurProdvaraiantdata(data)
      ).unwrap();

      if (variantValues?.data?.statusCode === 1) {
        const variants =
          variantValues?.data?.data?.filter(
            (prod) =>
              prod?.ProductDetail?.[0]?.ProdId === selectedProduct?.ProdId
          )?.[0]?.ProductDetail?.[0]?.ProdVariantDetails || [];

        // Add unique identifier to each variant if not present
        const variantsWithId = variants.map((variant, index) => ({
          ...variant,
          ProdVariantId:
            variant.ProdVariantId ||
            variant.StockDetails?.[0]?.InwardDtlId ||
            `${selectedProduct.ProdId}_${variant.ProdVariantName}_${index}`,
        }));

        if (variantsWithId.length > 1) {
          setVariantDetails(variantsWithId);
          setSelectedVariants([]); // Reset selected variants
          setShowVariantModal(true);
        } else if (variantsWithId.length === 1) {
          addProductToTable(selectedProduct, variantsWithId[0]);
        } else {
          addProductToTable(selectedProduct);
        }
      } else {
        addProductToTable(selectedProduct);
      }
    } catch (error) {
      console.error('Error fetching variants:', error);
      addProductToTable(selectedProduct);
    }
  };

  const handleFieldChange = (field, index, value) => {
    setTableData((prev) => {
      const updated = [...prev];
      const actualItem = filteredTableData[index];
      const actualIndex = prev?.findIndex(
        (p) =>
          p.ProdId === actualItem.ProdId &&
          p.ProdVariantId === actualItem.ProdVariantId
      );

      if (actualIndex !== -1) {
        updated[actualIndex][field] = value;
      }
      return updated;
    });
  };

  const handleVariantCheckboxChange = (variantId, checked) => {
    setSelectedVariants((prev) => {
      if (checked) {
        return [...prev, variantId];
      } else {
        return prev.filter((id) => id !== variantId);
      }
    });
  };

  const handleAddSelectedVariants = () => {
    if (selectedVariants.length === 0) {
      setMessageType('warning');
      setMessageData('Please select at least one variant');
      return;
    }

    if (selectedProductForVariant) {
      let addedCount = 0;

      selectedVariants.forEach((variantId) => {
        const variant = variantDetails.find(
          (v) => v.ProdVariantId === variantId
        );
        if (variant) {
          const success = addProductToTable(selectedProductForVariant, variant);
          if (success) addedCount++;
        }
        if (addedCount > 0) {
          setMessageType('success');
          setMessageData(
            `${variant.ProdVariantName} added to transfer successfully`
          );
        }
      });
    }

    setShowVariantModal(false);
    setVariantDetails([]);
    setSelectedProductForVariant(null);
    setSelectedVariants([]);

    if (scanner) {
      setTimeout(() => {
        productInputRef.current?.focus();
        setProductSearchText('');
      }, 100);
    }
  };

  const handleDeleteRow = (index) => {
    const productToDelete = filteredTableData[index];

    setTableData((prev) =>
      prev?.filter(
        (p) =>
          !(
            p.ProdId === productToDelete.ProdId &&
            p.ProdVariantId === productToDelete.ProdVariantId
          )
      )
    );

    setMessageType('success');
    setMessageData(`${productToDelete.ProdName} removed successfully`);
  };

  const onFinish = async () => {
    if (tableData.length === 0) {
      setMessageType('warning');
      setMessageData('Please add at least one product');
      return;
    }
    const invalidRow = tableData.find(
      (item) => !item.ReceivedQty || Number(item.ReceivedQty) <= 0
    );

    if (invalidRow) {
      setMessageType('warning');
      setMessageData('Required Qty must be greater than 0 for all products');
      return;
    }
    if (!selectedBranchId) {
      setMessageType('warning');
      setMessageData('Please select To Location (Branch)');
      return;
    }
    const payload = {
      CompId: CompId,
      BranchId: BranchId,
      AppId: AppId,
      FromLocationId:
        selectedComponent === 'Create' ? selectedBranchId : BranchId,
      ToLocationId:
        selectedComponent === 'Create' ? BranchId : selectedBranchId,
      RequestStatus: selectedComponent,
      RequestStock: tableData?.map((item) => ({
        ProdId: item.ProdId,
        InwardDtlId: item.InwardDtlId,
        ProdVariantName:item.ProdVariantName,
        RequestedQty: Number(item.ReceivedQty),
        ProdVariantName: item.ProdVariantName,
      })),
      CreatedBy: UserId,
    };

    const response = await dispatch(postRequestStock(payload)).unwrap();
    if (response?.data?.statusCode === 1) {
      setMessageType('success');
      setMessageData(response?.data?.response);
      setTableData('');
      setSelectedBranchId('');
      navigate(`${subDirectory}setting/stock-transferlist`);
    } else {
      setMessageType('error');
      setMessageData(response?.data?.response);
    }
  };
  useEffect(() => {
    if (status && status !== selectedComponent) {
      setselectedComponent(status);
    }
  }, [status]);
  const ComponentSelect = (value) => {
    setselectedComponent(value);
  };

  const handleScannerToggle = () => {
    setScanner((prev) => {
      const next = !prev;
      if (next) {
        setIsManualSelection(false);
        setTimeout(() => productInputRef.current?.focus(), 0);
      }
      return next;
    });
  };

  return (
    <div className="pageOverAll CreateTransferMaster">
      <div className="userPage">
        <div className="userPageContent">
          <Messages
            messageType={messageType}
            messageData={messageData}
            onComplete={onComplete}
          />

          {/* <FormHeader title="Create Transfer" /> */}
          {/* <div
                        className="defaultandCustomisedTheme"
                    >
                        {status === 'Create' && <div
                            className={selectedComponent === 'Create' ? 'selected' : ''}
                            onClick={() => ComponentSelect(status)}
                        >
                            {status} Transfer
                        </div>}
                        {status === 'Request' && <div
                            className={selectedComponent === 'Request' ? 'selected' : ''}
                            onClick={() => ComponentSelect(status)}
                        >
                            {status} Transfer
                        </div>}
                    </div> */}
          <Form ref={formProductRef} layout="vertical">
            <div style={{ display: 'flex', gap: '10px' }}>
              <div className="product-selection-row">
                <div className="product-name-wrapper">
                  <FloatLabel label="Product Name" value={productSearchText}>
                    <AutoComplete
                      ref={productInputRef}
                      options={productOptions}
                      value={productSearchText}
                      onSelect={(value, option) =>
                        handleProductSelect(value, option)
                      }
                      onChange={handleProductSearch}
                      filterOption={(input, option) =>
                        option.label.toLowerCase().includes(input.toLowerCase())
                      }
                      disabled={isProcessing}
                    />
                  </FloatLabel>
                  {isMobile ? (
                    <div className="IsmoBileBarcode">
                      <BarCodeScan
                        onScan={(value) => {
                          debouncedScannerSearch(value);
                        }}
                      />
                    </div>
                  ) : (
                    <Tooltip title="BarCode / QR Code">
                      <BsUpcScan
                        className={`product-scan-icon ${scanner ? 'active' : ''}`}
                        onClick={handleScannerToggle}
                      />
                    </Tooltip>
                  )}
                </div>
              </div>
              <div>
                <DropDowns
                  label={<label className="required">Branch</label>}
                  className="field-DropDown"
                  options={branchData?.map((option) => ({
                    value: option.BrId,
                    label: option.BrName,
                  }))}
                  onChangeFunction={(e) => branchDropDownChange(e)}
                  valueData={selectedBranchId}
                />
              </div>
              {/* <div>
                            <Input
                                placeholder="Search products in table..."
                                value={searchText}
                                allowClear
                                onChange={(e) => setSearchText(e.target.value)}
                                className="transfer-search-input"
                            />
                        </div> */}
            </div>
          </Form>

          <Form onFinish={onFinish} className="transfer-form">
            <div className="transfer-table-container">
              <table className="transfer-table">
                <thead className="transfer-table-head">
                  <tr>
                    <th style={{ width: '60px' }}>S.No</th>
                    <th style={{ textAlign: 'left' }}>Product Name</th>
                    <th>Product Variant</th>
                    <th>UOM Name</th>
                    {selectedComponent === 'Create' && <th>Balance Qty</th>}
                    <th>Required Qty</th>
                    <th style={{ width: '100px' }}>Action</th>
                  </tr>
                </thead>

                <tbody className="transfer-table-body">
                  {filteredTableData.length === 0 ? (
                    <tr>
                      <td colSpan="7" className="transfer-no-data">
                        No products added yet.
                      </td>
                    </tr>
                  ) : (
                    filteredTableData?.map((record, index) => (
                      <tr
                        key={`${record.ProdId}-${record.ProdVariantId || 'no-variant'}`}
                      >
                        <td>{index + 1}</td>
                        <td style={{ textAlign: 'left' }}>{record.ProdName}</td>
                        <td>{record.ProdVariantName || 'N/A'}</td>
                        <td>{record.UomName}</td>
                        {selectedComponent === 'Create' && (
                          <td>{record.OverAllQty}</td>
                        )}
                        <td>
                          <Input
                            className="transfer-input"
                            // value={record.ReceivedQty}
                            placeholder="0"
                            onChange={(e) =>
                              handleFieldChange(
                                'ReceivedQty',
                                index,
                                e.target.value.replace(/[^0-9.]/g, '')
                              )
                            }
                          />
                        </td>
                        <td className="transfer-action">
                          <DeleteFilled
                            style={{
                              color: '#FF4D4F',
                              cursor: 'pointer',
                              fontSize: '16px',
                            }}
                            onClick={() => handleDeleteRow(index)}
                          />
                        </td>
                      </tr>
                    ))
                  )}
                </tbody>
              </table>
            </div>

            <div className="buttonStyle">
              <Buttons
                icon={<ArrowRightOutlined />}
                buttonText={status}
                color="901D77"
                htmlType="submit"
              />
            </div>
          </Form>

          <Modal
            title="Select Product Variant"
            open={showVariantModal}
            onCancel={() => {
              setShowVariantModal(false);
              setVariantDetails([]);
              setSelectedProductForVariant(null);
              setSelectedVariants([]);

              if (scanner) {
                setTimeout(() => {
                  productInputRef.current?.focus();
                  setProductSearchText('');
                }, 100);
              }
            }}
            onOk={handleAddSelectedVariants}
            okText="Add Selected Variants"
            cancelText="Cancel"
            width={500}
          >
            <div className="variant-modal-content">
              {variantDetails && variantDetails.length > 0 ? (
                <div>
                  <p style={{ marginBottom: '1rem', fontWeight: 500 }}>
                    Select variant(s) for{' '}
                    <strong>{selectedProductForVariant?.ProdName}</strong>
                  </p>
                  {variantDetails.map((variant) => (
                    <div
                      key={variant.ProdVariantId}
                      className="variant-option"
                      style={{
                        padding: '12px',
                        border: '1px solid #d9d9d9',
                        borderRadius: '4px',
                        marginBottom: '8px',
                        cursor: 'pointer',
                        transition: 'all 0.3s',
                        backgroundColor: selectedVariants.includes(
                          variant.ProdVariantId
                        )
                          ? '#f0f5ff'
                          : 'transparent',
                      }}
                      onClick={() =>
                        handleVariantCheckboxChange(
                          variant.ProdVariantId,
                          !selectedVariants.includes(variant.ProdVariantId)
                        )
                      }
                    >
                      <div
                        style={{
                          display: 'flex',
                          alignItems: 'center',
                          gap: '12px',
                        }}
                      >
                        <input
                          type="checkbox"
                          checked={selectedVariants.includes(
                            variant.ProdVariantId
                          )}
                          onChange={(e) =>
                            handleVariantCheckboxChange(
                              variant.ProdVariantId,
                              e.target.checked
                            )
                          }
                          onClick={(e) => e.stopPropagation()}
                          style={{
                            width: '18px',
                            height: '18px',
                            cursor: 'pointer',
                            accentColor: '#901D77',
                          }}
                        />
                        <div style={{ flex: 1 }}>
                          <p style={{ margin: '0 0 4px 0', fontWeight: 500 }}>
                            {variant.ProdVariantName}
                          </p>
                          <p
                            style={{
                              margin: '0',
                              fontSize: '12px',
                              color: '#666',
                            }}
                          >
                            MRP: ₹{variant.StockDetails?.[0]?.MRP || 0} | Sell
                            Price: ₹{variant.StockDetails?.[0]?.SellPrice || 0}
                          </p>
                        </div>
                      </div>
                    </div>
                  ))}
                  <p
                    style={{
                      marginTop: '12px',
                      fontSize: '12px',
                      color: '#666',
                    }}
                  >
                    Selected: {selectedVariants.length} variant(s)
                  </p>
                </div>
              ) : (
                <p>No variants available</p>
              )}
            </div>
          </Modal>
        </div>
      </div>
    </div>
  );
};

export default CreateTransfer;