import 'dart:io';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pw;
import 'package:printing/printing.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'package:path_provider/path_provider.dart';
import 'package:flutter/services.dart'; // For rootBundle
import 'package:shopbillingsoftware/Plans_Packages/reuseable_prints/Prints language/english_print.dart';
import 'package:shopbillingsoftware/Plans_Packages/reuseable_prints/Prints language/tamil_print.dart';
import 'package:shopbillingsoftware/Plans_Packages/reuseable_prints/Prints language/Hindi_print.dart';
import 'package:shopbillingsoftware/Plans_Packages/reuseable_prints/Prints language/malayalam_print.dart';

// Add barcode scanner package - you'll need to add this to your pubspec.yaml
import 'package:flutter_barcode_scanner/flutter_barcode_scanner.dart';

class PremiumSalesComponent extends StatefulWidget {
  final Map<String, dynamic> userData;

  const PremiumSalesComponent({Key? key, required this.userData}) : super(key: key);

  @override
  _SalesComponentState createState() => _SalesComponentState();
}

class _SalesComponentState extends State<PremiumSalesComponent> {
  List<dynamic> _products = [];
  Map<String, dynamic> _businessProfile = {};
  Map<String, dynamic> _settings = {};
  bool _isLoading = false;
  bool _isProfileLoading = true;
  bool _isSettingsLoading = true;

  // 🔵 LITE BLUE COLOR SCHEME
  final Color _primaryColor = Colors.green;
  final Color _primaryDark = Colors.green[800]!;
  final Color _primaryLight = Colors.green[50]!;
  final Color _backgroundColor = Color(0xFFF7FDF7);
  final Color _cardColor = Colors.white;
  final Color _textColor = Color(0xFF3B82F6);
  final Color _textLight = Color(0xFF6B7280);

  final String _productsUrl = 'http://localhost/shop_billing/Admin_register/products.php';
  final String _profileUrl = 'http://localhost/shop_billing/Admin_register/';
  final String _settingsUrl = 'http://localhost/shop_billing/Admin_register/settings.php';

  @override
  void initState() {
    super.initState();
    _fetchBusinessProfile();
    _fetchSettings();
    _fetchProducts();
  }

  Future<void> _fetchBusinessProfile() async {
    setState(() => _isProfileLoading = true);
    try {
      final response = await http.get(
        Uri.parse("${_profileUrl}get_profile.php?admin_id=${widget.userData['id']}"),
      );

      if (response.statusCode == 200) {
        final dynamic json = jsonDecode(response.body);
        if (json['success'] && json['data'] != null) {
          setState(() {
            _businessProfile = Map<String, dynamic>.from(json['data']);
          });
          print('Business profile loaded: ${_businessProfile['business_name']}');
          print('Signature path: ${_businessProfile['signature']}');
        }
      }
    } catch (e) {
      print("Profile fetch error: $e");
    } finally {
      setState(() => _isProfileLoading = false);
    }
  }

  Future<void> _fetchSettings() async {
    setState(() => _isSettingsLoading = true);
    try {
      final response = await http.get(
        Uri.parse('$_settingsUrl?action=get_settings&admin_id=${widget.userData['id']}'),
      );

      if (response.statusCode == 200) {
        final dynamic json = jsonDecode(response.body);
        print('Settings API Response: $json');

        if (json['status'] == 'success' && json['settings'] != null) {
          setState(() {
            _settings = Map<String, dynamic>.from(json['settings']);
          });
          print('Settings loaded successfully: $_settings');
        } else {
          _setDefaultSettings();
        }
      } else {
        print('Settings API Error: ${response.statusCode}');
        _setDefaultSettings();
      }
    } catch (e) {
      print("Settings fetch error: $e");
      _setDefaultSettings();
    } finally {
      setState(() => _isSettingsLoading = false);
    }
  }

  void _setDefaultSettings() {
    setState(() {
      _settings = {
        'receipt_type': 'thermal',
        'paper_size': '80mm',
        'print_with_logo': '1',
        'print_with_signature': '1',
        'gst_type': 'with_gst',
        'language': 'english',
        'fssai_number': '',
        'gstin_number': '',
      };
    });
    print('Default settings set: $_settings');
  }

  // 🔥 Filter products to show only those with same admin_id
  List<dynamic> get _filteredProductsByAdmin {
    final currentAdminId = int.tryParse(widget.userData['id']?.toString() ?? '1') ?? 1;
    return _products.where((product) {
      final productAdminId = int.tryParse(product['admin_id']?.toString() ?? '0') ?? 0;
      return productAdminId == currentAdminId;
    }).toList();
  }

  Future<void> _fetchProducts() async {
    setState(() {
      _isLoading = true;
    });

    try {
      print('🔄 Fetching products from: $_productsUrl');
      final response = await http.get(Uri.parse(_productsUrl));
      print('📡 Response status: ${response.statusCode}');

      if (response.statusCode == 200) {
        List<dynamic> productData = json.decode(response.body);
        print('📦 Products fetched: ${productData.length}');

        // Debug: Print first few products
        if (productData.isNotEmpty) {
          for (int i = 0; i < (productData.length > 3 ? 3 : productData.length); i++) {
            print('Product $i: ${productData[i]}');
          }
        }

        setState(() {
          _products = productData;
        });

        // Check filtered products
        print(' Filtered products by admin: ${_filteredProductsByAdmin.length}');
      } else {
        print(' Failed to fetch products. Status: ${response.statusCode}');
        print('Response body: ${response.body}');
      }
    } catch (e) {
      print(' Error fetching products: $e');
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  void _showSnackBar(String message) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(message),
        duration: Duration(seconds: 3),
        backgroundColor: _primaryColor,
        behavior: SnackBarBehavior.floating,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: _backgroundColor,
      body: _isLoading || _isProfileLoading || _isSettingsLoading
          ? Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            CircularProgressIndicator(color: _primaryColor, strokeWidth: 3),
            SizedBox(height: 16),
            Text(
              'Loading...',
              style: TextStyle(color: _textLight, fontSize: 16),
            ),
          ],
        ),
      )
          : NewSalePage(
        userData: widget.userData,
        products: _filteredProductsByAdmin,
        businessProfile: _businessProfile,
        settings: _settings,
        baseUrl: _profileUrl,
        onSettingsUpdated: _fetchSettings,
      ),
    );
  }
}

// New Sale Page with Lite Blue UI
class NewSalePage extends StatefulWidget {
  final Map<String, dynamic> userData;
  final List<dynamic> products;
  final Map<String, dynamic> businessProfile;
  final Map<String, dynamic> settings;
  final String baseUrl;
  final VoidCallback? onSettingsUpdated;

  const NewSalePage({
    Key? key,
    required this.userData,
    required this.products,
    required this.businessProfile,
    required this.settings,
    required this.baseUrl,
    this.onSettingsUpdated,
  }) : super(key: key);

  @override
  _NewSalePageState createState() => _NewSalePageState();
}

class _NewSalePageState extends State<NewSalePage> {
  final _formKey = GlobalKey<FormState>();

  // Controllers
  TextEditingController invoiceController = TextEditingController();
  TextEditingController customerNameController = TextEditingController();
  TextEditingController mobileNumberController = TextEditingController();
  TextEditingController saleDateController = TextEditingController();
  TextEditingController tenderAmountController = TextEditingController();

  // Product list
  List<Map<String, dynamic>> saleItems = [];

  // Focus nodes for keyboard navigation
  List<FocusNode> _productFocusNodes = [];
  List<FocusNode> _quantityFocusNodes = [];

  // Calculations
  double totalTaxableValue = 0.0;
  double totalGSTAmount = 0.0;
  double totalCGSTAmount = 0.0;
  double totalSGSTAmount = 0.0;
  double totalDiscount = 0.0;
  double grandTotal = 0.0;
  double tenderAmount = 0.0;
  double balanceAmount = 0.0;

  bool _isSaving = false;
  String _selectedLanguage = 'english'; // Default language

  // Barcode scanning
  bool _isScanning = false;
  String _lastScannedBarcode = '';

  // 🔵 LITE BLUE COLOR SCHEME
  final Color _primaryColor = Color(0xFF3B82F6);
  final Color _primaryDark = Color(0xFF1976D2);
  final Color _primaryLight = Color(0xFFE3F2FD);
  final Color _backgroundColor = Color(0xFFF8FBFF);
  final Color _cardColor = Colors.white;
  final Color _textColor = Color(0xFF1F2937);
  final Color _textLight = Color(0xFF6B7280);

  final String _salesUrl = 'http://localhost/shop_billing/Admin_register/sales.php';

  // Dynamic Settings Getters
  String get _gstType => widget.settings['gst_type']?.toString().toLowerCase() ?? 'with_gst';
  String get _language => widget.settings['language']?.toString().toLowerCase() ?? 'english';
  String get _receiptType => widget.settings['receipt_type']?.toString().toLowerCase() ?? 'thermal';
  String get _paperSize => widget.settings['paper_size']?.toString().toLowerCase() ?? '80mm';
  bool get _printWithLogo => widget.settings['print_with_logo']?.toString() == '1';
  bool get _printWithSignature => widget.settings['print_with_signature']?.toString() == '1' && _printWithLogo; // 🔥 MODIFIED: Signature depends on logo
  String get _fssaiNumber => widget.settings['fssai_number']?.toString() ?? '';
  String get _gstinNumber => widget.settings['gstin_number']?.toString() ?? '';

  @override
  void initState() {
    super.initState();
    _initializeForm();
    _initializeFocusNodes();

    // Listen to tender amount changes
    tenderAmountController.addListener(_calculateBalance);
  }

  void _initializeForm() {
    // Generate invoice number
    invoiceController.text = 'SALE-${DateTime.now().millisecondsSinceEpoch}';
    // Set current date
    saleDateController.text = _getCurrentDate();
    // Clear tender amount
    tenderAmountController.clear();

    // Reset product items
    saleItems.clear();
    _addProductItem();

    // Reset calculations
    totalTaxableValue = 0.0;
    totalGSTAmount = 0.0;
    totalCGSTAmount = 0.0;
    totalSGSTAmount = 0.0;
    totalDiscount = 0.0;
    grandTotal = 0.0;
    tenderAmount = 0.0;
    balanceAmount = 0.0;

    // Set language from settings
    _selectedLanguage = _language;

    // Debug settings
    print('Form initialized with new invoice: ${invoiceController.text}');
  }

  void _initializeFocusNodes() {
    // Initialize focus nodes for existing items
    for (int i = 0; i < saleItems.length; i++) {
      _productFocusNodes.add(FocusNode());
      _quantityFocusNodes.add(FocusNode());
    }
  }

  String _getCurrentDate() {
    final now = DateTime.now();
    return '${now.day.toString().padLeft(2, '0')}-${now.month.toString().padLeft(2, '0')}-${now.year}';
  }

  void _addProductItem() {
    setState(() {
      saleItems.add({
        'product_id': 0,
        'quantity': 1,
        'price_incl_gst': 0.0,
        'discount': 0.0,
        'gst_percentage': 0.0,
        'taxable_amount': 0.0,
        'total_amount': 0.0,
        'cgst_amount': 0.0,
        'sgst_amount': 0.0,
        'product_name': '',
        'barcode': '',
      });

      // Add focus nodes for new item
      _productFocusNodes.add(FocusNode());
      _quantityFocusNodes.add(FocusNode());
    });
  }

  void _removeProductItem(int index) {
    if (saleItems.length > 1) {
      setState(() {
        saleItems.removeAt(index);
        _productFocusNodes.removeAt(index);
        _quantityFocusNodes.removeAt(index);
        _calculateTotals();
      });
    }
  }

  void _updateProductItem(int index, String field, dynamic value) {
    setState(() {
      saleItems[index][field] = value;
      _calculateProductItem(index);
      _calculateTotals();
    });
  }

  void _calculateProductItem(int index) {
    int quantity = saleItems[index]['quantity'];
    double price = saleItems[index]['price_incl_gst'];
    double discount = saleItems[index]['discount'];

    // Use GST percentage only if GST is enabled, otherwise set to 0
    double gstRate = _gstType == 'with_gst' ? saleItems[index]['gst_percentage'] : 0.0;

    // Calculate discounted price
    double discountedPrice = price - (price * discount / 100);

    // Calculate taxable amount (before GST)
    double taxableAmount = discountedPrice * quantity;

    // Calculate GST amount (0 if GST is disabled)
    double gstAmount = _gstType == 'with_gst' ? taxableAmount * gstRate / 100 : 0.0;


    double cgstAmount = gstAmount / 2;
    double sgstAmount = gstAmount / 2;

    // Calculate total amount (taxable + GST)
    double totalAmount = taxableAmount + gstAmount;

    setState(() {
      saleItems[index]['taxable_amount'] = double.parse(taxableAmount.toStringAsFixed(2));
      saleItems[index]['total_amount'] = double.parse(totalAmount.toStringAsFixed(2));
      saleItems[index]['gst_percentage'] = gstRate;
      saleItems[index]['cgst_amount'] = double.parse(cgstAmount.toStringAsFixed(2));
      saleItems[index]['sgst_amount'] = double.parse(sgstAmount.toStringAsFixed(2));
    });
  }

  void _calculateTotals() {
    totalTaxableValue = 0.0;
    totalGSTAmount = 0.0;
    totalCGSTAmount = 0.0;
    totalSGSTAmount = 0.0;
    totalDiscount = 0.0;
    grandTotal = 0.0;

    for (var item in saleItems) {
      totalTaxableValue += item['taxable_amount'];

      // Only calculate GST amount if GST is enabled
      if (_gstType == 'with_gst') {
        totalGSTAmount += item['taxable_amount'] * item['gst_percentage'] / 100;
        totalCGSTAmount += (item['taxable_amount'] * item['gst_percentage'] / 100) / 2;
        totalSGSTAmount += (item['taxable_amount'] * item['gst_percentage'] / 100) / 2;
      }

      totalDiscount += (item['price_incl_gst'] * item['discount'] / 100) * item['quantity'];
    }

    grandTotal = totalTaxableValue + totalGSTAmount;

    // Round to 2 decimal places
    totalTaxableValue = double.parse(totalTaxableValue.toStringAsFixed(2));
    totalGSTAmount = double.parse(totalGSTAmount.toStringAsFixed(2));
    totalCGSTAmount = double.parse(totalCGSTAmount.toStringAsFixed(2));
    totalSGSTAmount = double.parse(totalSGSTAmount.toStringAsFixed(2));
    totalDiscount = double.parse(totalDiscount.toStringAsFixed(2));
    grandTotal = double.parse(grandTotal.toStringAsFixed(2));

    // Recalculate balance when totals change
    _calculateBalance();
  }

  void _calculateBalance() {
    double tender = double.tryParse(tenderAmountController.text) ?? 0.0;
    setState(() {
      tenderAmount = tender;
      balanceAmount = tender - grandTotal;
    });
  }

  // 🔥 BARCODE SCANNING FUNCTIONALITY
  Future<void> _scanBarcode(int index) async {
    if (_isScanning) return;

    setState(() {
      _isScanning = true;
    });

    try {
      String barcodeScanRes = await FlutterBarcodeScanner.scanBarcode(
        '#FF3B82F6', // Scanner color
        'Cancel', // Cancel button text
        true, // Show flash option
        ScanMode.BARCODE, // Scan mode
      );

      if (barcodeScanRes != '-1') {
        _lastScannedBarcode = barcodeScanRes;
        _findProductByBarcode(barcodeScanRes, index);
      } else {
        _showSnackBar('Scanning cancelled');
      }
    } on PlatformException {
      _showSnackBar('Failed to scan barcode');
    } catch (e) {
      _showSnackBar('Error: $e');
    } finally {
      setState(() {
        _isScanning = false;
      });
    }
  }

  void _findProductByBarcode(String barcode, int index) {
    // Search for product by barcode in the products list
    Map<String, dynamic>? foundProduct;

    for (var product in widget.products) {
      String productBarcode = product['barcode']?.toString() ?? '';
      if (productBarcode.isNotEmpty && productBarcode == barcode) {
        foundProduct = Map<String, dynamic>.from(product);
        break;
      }
    }

    if (foundProduct != null) {
      _onProductSelected(index, foundProduct);
      _showSnackBar('Product found: ${foundProduct['product_name']}');
    } else {
      _showSnackBar('Product not found for barcode: $barcode');
      // Optionally, you can manually search for the product
      _showManualSearchDialog(barcode, index);
    }
  }

  void _showManualSearchDialog(String barcode, int index) {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: Text('Product Not Found'),
          content: Text('No product found with barcode: $barcode\n\nPlease select the product manually.'),
          actions: [
            TextButton(
              onPressed: () {
                Navigator.of(context).pop();
                // Focus on the search field for manual selection
                Future.delayed(Duration(milliseconds: 300), () {
                  if (_productFocusNodes.length > index) {
                    _productFocusNodes[index].requestFocus();
                  }
                });
              },
              child: Text('OK'),
            ),
          ],
        );
      },
    );
  }

  // 🔥 MODIFIED: Enhanced product selection with auto-navigation
  void _onProductSelected(int index, Map<String, dynamic> selectedProduct) {
    if (selectedProduct.isEmpty) return;

    print('Selected Product: ${selectedProduct['product_name']}');

    // Convert to double safely
    double sellingPrice = double.tryParse(selectedProduct['selling_price']?.toString() ?? '0.0') ?? 0.0;
    double gstRate = _gstType == 'with_gst' ? (double.tryParse(selectedProduct['gst']?.toString() ?? '0.0') ?? 0.0) : 0.0;
    int productId = int.tryParse(selectedProduct['id']?.toString() ?? '0') ?? 0;
    String barcode = selectedProduct['barcode']?.toString() ?? '';

    setState(() {
      saleItems[index]['product_id'] = productId;
      saleItems[index]['price_incl_gst'] = sellingPrice;
      saleItems[index]['gst_percentage'] = gstRate;
      saleItems[index]['product_name'] = selectedProduct['product_name'] ?? 'Unknown';
      saleItems[index]['barcode'] = barcode;

      _calculateProductItem(index);
      _calculateTotals();
    });

    // 🔥 AUTO FOCUS TO QUANTITY FIELD
    Future.delayed(Duration(milliseconds: 100), () {
      if (_quantityFocusNodes.length > index) {
        _quantityFocusNodes[index].requestFocus();
      }
    });
  }

  // 🔥 ENHANCED: Product search field with keyboard navigation
  Widget _buildProductSearchField(int index) {
    print('🔄 Building product search field for index $index');
    print('📊 Total products available: ${widget.products.length}');
    print('🔍 Filtered products count: ${widget.products.length}');

    if (widget.products.isEmpty) {
      return Container(
        padding: EdgeInsets.all(8),
        decoration: BoxDecoration(
          color: Colors.orange[50],
          border: Border.all(color: Colors.orange),
          borderRadius: BorderRadius.circular(4),
        ),
        child: Row(
          children: [
            Icon(Icons.warning, color: Colors.orange, size: 16),
            SizedBox(width: 8),
            Expanded(
              child: Text(
                'No products found. Please check if products exist for your account.',
                style: TextStyle(fontSize: 12, color: Colors.orange[800]),
              ),
            ),
          ],
        ),
      );
    }

    return Row(
      children: [
        Expanded(
          child: Autocomplete<Map<String, dynamic>>(
            optionsBuilder: (TextEditingValue textEditingValue) {
              print('🔍 Searching for: ${textEditingValue.text}');

              if (textEditingValue.text.isEmpty) {
                print('📝 Text field is empty, showing all products');
                return widget.products.cast<Map<String, dynamic>>();
              }

              final filteredProducts = widget.products.where((product) {
                final productName = product['product_name']?.toString().toLowerCase() ?? '';
                final searchText = textEditingValue.text.toLowerCase();
                final bool matches = productName.contains(searchText);

                if (matches) {
                  print('✅ Product match: $productName');
                }

                return matches;
              }).cast<Map<String, dynamic>>();

              print('🎯 Found ${filteredProducts.length} matching products');
              return filteredProducts;
            },
            displayStringForOption: (Map<String, dynamic> product) {
              final name = product['product_name'] ?? 'Unknown';
              print('📋 Displaying product: $name');
              return name;
            },
            onSelected: (Map<String, dynamic> product) {
              print('🎯 Product selected: ${product['product_name']}');
              _onProductSelected(index, product);
            },
            fieldViewBuilder: (BuildContext context, TextEditingController textEditingController, FocusNode focusNode, VoidCallback onFieldSubmitted) {
              // Update controller text based on current product
              if (saleItems[index]['product_name'] == null || saleItems[index]['product_name'].isEmpty) {
                textEditingController.clear();
              } else {
                textEditingController.text = saleItems[index]['product_name'];
              }

              return TextField(
                controller: textEditingController,
                focusNode: _productFocusNodes[index],
                decoration: _getTableBottomLineDecoration().copyWith(
                  hintText: "Select product (${widget.products.length} available)...",
                  hintStyle: TextStyle(fontSize: 12, color: _textLight),
                  prefixIcon: Icon(Icons.search, size: 18, color: _primaryColor),
                ),
                style: TextStyle(fontSize: 12, color: _textColor),
                onChanged: (value) {
                  if (value.isEmpty) {
                    setState(() {
                      saleItems[index]['product_id'] = 0;
                      saleItems[index]['product_name'] = '';
                      saleItems[index]['price_incl_gst'] = 0.0;
                      saleItems[index]['gst_percentage'] = 0.0;
                      saleItems[index]['barcode'] = '';
                      _calculateProductItem(index);
                      _calculateTotals();
                    });
                  }
                },
                onSubmitted: (value) {
                  if (value.isNotEmpty) {
                    var exactMatch = widget.products.firstWhere(
                          (product) => (product['product_name']?.toString().toLowerCase() ?? '') == value.toLowerCase(),
                      orElse: () => {},
                    );
                    if (exactMatch.isNotEmpty) {
                      _onProductSelected(index, exactMatch);
                    }
                  }
                },
              );
            },
            optionsViewBuilder: (BuildContext context, AutocompleteOnSelected<Map<String, dynamic>> onSelected, Iterable<Map<String, dynamic>> options) {
              print('📱 Options view shown with ${options.length} options');

              return Align(
                alignment: Alignment.topLeft,
                child: Material(
                  elevation: 4,
                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
                  child: Container(
                    constraints: const BoxConstraints(maxHeight: 200, maxWidth: 350),
                    child: options.isEmpty
                        ? Padding(
                      padding: EdgeInsets.all(16),
                      child: Text(
                        'No products found. Check if products exist in your database.',
                        style: TextStyle(color: _textLight, fontSize: 12),
                      ),
                    )
                        : ListView.builder(
                      padding: EdgeInsets.zero,
                      shrinkWrap: true,
                      itemCount: options.length,
                      itemBuilder: (BuildContext context, int index) {
                        final option = options.elementAt(index);
                        final productName = option['product_name'] ?? 'Unknown';
                        final sellingPrice = double.tryParse(option['selling_price']?.toString() ?? '0.0') ?? 0.0;
                        final gstRate = double.tryParse(option['gst']?.toString() ?? '0.0') ?? 0.0;
                        final barcode = option['barcode']?.toString() ?? 'No Barcode';

                        return ListTile(
                          title: Text(
                            productName,
                            style: TextStyle(fontSize: 12, fontWeight: FontWeight.w500),
                          ),
                          subtitle: Text(
                            'Price: ₹${sellingPrice.toStringAsFixed(2)} | GST: ${gstRate.toStringAsFixed(1)}% | Barcode: $barcode',
                            style: TextStyle(fontSize: 10, color: _textLight),
                          ),
                          dense: true,
                          visualDensity: VisualDensity.compact,
                          contentPadding: EdgeInsets.symmetric(horizontal: 12, vertical: 4),
                          onTap: () => onSelected(option),
                        );
                      },
                    ),
                  ),
                ),
              );
            },
          ),
        ),
        SizedBox(width: 8),
        // Barcode Scanner Button
        // Container(
        //   width: 44,
        //   height: 44,
        //   decoration: BoxDecoration(
        //     color: _primaryColor,
        //     borderRadius: BorderRadius.circular(8),
        //   ),
        //   child: IconButton(
        //     icon: _isScanning
        //         ? SizedBox(
        //       width: 16,
        //       height: 16,
        //       child: CircularProgressIndicator(
        //         strokeWidth: 2,
        //         valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
        //       ),
        //     )
        //         : Icon(Icons.qr_code_scanner, color: Colors.white, size: 20),
        //     onPressed: () => _scanBarcode(index),
        //     tooltip: 'Scan Barcode',
        //     padding: EdgeInsets.zero,
        //   ),
        // ),
      ],
    );
  }

  // Helper method for text field decoration
  InputDecoration _getTableBottomLineDecoration() {
    return InputDecoration(
      border: UnderlineInputBorder(borderSide: BorderSide(color: _primaryColor.withOpacity(0.3))),
      enabledBorder: UnderlineInputBorder(borderSide: BorderSide(color: _primaryColor.withOpacity(0.3))),
      focusedBorder: UnderlineInputBorder(borderSide: BorderSide(color: _primaryColor)),
      contentPadding: EdgeInsets.symmetric(vertical: 8, horizontal: 8),
      isDense: true,
      filled: true,
      fillColor: _cardColor,
    );
  }

  // 🔥 ENHANCED: Quantity field that moves to NEXT PRODUCT when Enter is pressed
  Widget _buildLiteBlueNumberField({
    required double value,
    required String label,
    required Function(double) onChanged,
    required int index,
  }) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(label, style: TextStyle(fontSize: 11, color: _textColor, fontWeight: FontWeight.w600)),
        SizedBox(height: 4),
        Container(
          height: 38,
          decoration: BoxDecoration(
            color: _cardColor,
            borderRadius: BorderRadius.circular(6),
            border: Border.all(color: _primaryColor.withOpacity(0.2)),
          ),
          child: TextField(
            focusNode: _quantityFocusNodes[index],
            keyboardType: TextInputType.numberWithOptions(decimal: true),
            onChanged: (text) {
              double newValue = double.tryParse(text) ?? 0.0;
              onChanged(newValue);
            },
            onSubmitted: (value) {
              // 🔥 WHEN USER PRESSES ENTER IN QUANTITY FIELD:
              // 1. If there's a next product row, focus on its product search field
              // 2. If this is the last row, add a new product row and focus on it

              if (index < saleItems.length - 1) {
                // Move to next product's search field
                Future.delayed(Duration(milliseconds: 100), () {
                  if (_productFocusNodes.length > index + 1) {
                    _productFocusNodes[index + 1].requestFocus();
                  }
                });
              } else {
                // This is the last row - add new product and focus on it
                _addProductItem();
                Future.delayed(Duration(milliseconds: 100), () {
                  if (_productFocusNodes.length > index + 1) {
                    _productFocusNodes[index + 1].requestFocus();
                  }
                });
                _showSnackBar('New product row added automatically');
              }
            },
            style: TextStyle(fontSize: 12, color: _textColor),
            decoration: InputDecoration(
              border: InputBorder.none,
              contentPadding: EdgeInsets.symmetric(horizontal: 8, vertical: 10),
              filled: true,
              fillColor: _cardColor,
            ),
            controller: TextEditingController(text: value.toStringAsFixed(2)),
          ),
        ),
      ],
    );
  }

  // Build GST Type Dropdown (only show if GST is enabled)
  Widget _buildGSTTypeDropdown(int index) {
    if (_gstType == 'without_gst') {
      return SizedBox.shrink(); // Hide GST dropdown if GST is disabled
    }

    return Expanded(
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text('GST %', style: TextStyle(fontSize: 11, color: _textColor, fontWeight: FontWeight.w600)),
          SizedBox(height: 4),
          Container(
            height: 38,
            decoration: BoxDecoration(
              color: _cardColor,
              borderRadius: BorderRadius.circular(6),
              border: Border.all(color: _primaryColor.withOpacity(0.2)),
            ),
            child: TextField(
              keyboardType: TextInputType.numberWithOptions(decimal: true),
              onChanged: (text) {
                double newValue = double.tryParse(text) ?? 0.0;
                _updateProductItem(index, 'gst_percentage', newValue);
              },
              style: TextStyle(fontSize: 12, color: _textColor),
              decoration: InputDecoration(
                border: InputBorder.none,
                contentPadding: EdgeInsets.symmetric(horizontal: 8, vertical: 10),
                filled: true,
                fillColor: _cardColor,
              ),
              controller: TextEditingController(text: saleItems[index]['gst_percentage'].toStringAsFixed(2)),
            ),
          ),
        ],
      ),
    );
  }

  // Print Invoice with selected language
  Future<void> _printInvoice(String invoiceNo, Map<String, dynamic> sale) async {
    try {
      if (_selectedLanguage == 'tamil') {
        await TamilPrintService.printTamilInvoice(invoiceNo, sale, widget.settings, widget.baseUrl);
      } else if (_selectedLanguage == 'hindi') {
        await HindiPrintService.printHindiInvoice(invoiceNo, sale, widget.settings, widget.baseUrl);
      } else if (_selectedLanguage == 'malayalam') {
        await MalayalamPrintService.printMalayalamInvoice(invoiceNo, sale, widget.settings, widget.baseUrl);
      } else {
        await EnglishPrintService.printEnglishInvoice(invoiceNo, sale, widget.settings, widget.baseUrl);
      }
    } catch (e) {
      print('Printing error: $e');
      _showSnackBar('Printing error: $e');
    }
  }

  void _autoResetForm() {
    setState(() {
      String timestamp = DateTime.now().millisecondsSinceEpoch.toString();
      invoiceController.text = 'SALE-${timestamp.substring(timestamp.length - 6)}';

      saleDateController.text = _getCurrentDate();

      customerNameController.clear();
      mobileNumberController.clear();

      tenderAmountController.clear();

      saleItems.clear();
      _productFocusNodes.clear();
      _quantityFocusNodes.clear();
      _addProductItem();

      // Reset all calculations
      totalTaxableValue = 0.0;
      totalGSTAmount = 0.0;
      totalCGSTAmount = 0.0;
      totalSGSTAmount = 0.0;
      totalDiscount = 0.0;
      grandTotal = 0.0;
      tenderAmount = 0.0;
      balanceAmount = 0.0;
    });

    print('Form auto-reset completed. New invoice: ${invoiceController.text}');
  }

  Future<void> _saveAndPrint() async {
    if (_formKey.currentState!.validate()) {
      // Validate required fields
      if (customerNameController.text.isEmpty) {
        _showSnackBar('Please enter customer name');
        return;
      }

      // Validate tender amount
      if (tenderAmountController.text.isEmpty || tenderAmount < grandTotal) {
        _showSnackBar('Please enter tender amount greater than or equal to grand total');
        return;
      }

      // Validate products
      for (var i = 0; i < saleItems.length; i++) {
        var item = saleItems[i];
        if (item['product_id'] == 0 || item['product_name']?.isEmpty == true) {
          _showSnackBar('Please select product for item ${i + 1}');
          return;
        }
        if (item['quantity'] <= 0) {
          _showSnackBar('Please enter valid quantity for item ${i + 1}');
          return;
        }
      }

      setState(() {
        _isSaving = true;
      });

      // Prepare items data
      List<Map<String, dynamic>> formattedItems = [];
      for (var i = 0; i < saleItems.length; i++) {
        var item = saleItems[i];

        formattedItems.add({
          'product_id': item['product_id'],
          'quantity': item['quantity'],
          'price_incl_gst': item['price_incl_gst'],
          'discount': item['discount'],
          'gst_percentage': item['gst_percentage'],
          'taxable_amount': item['taxable_amount'],
          'total_amount': item['total_amount'],
          'cgst_amount': item['cgst_amount'] ?? 0.0,
          'sgst_amount': item['sgst_amount'] ?? 0.0,
          'product_name': item['product_name'],
          'barcode': item['barcode'] ?? '',
        });
      }

      final Map<String, dynamic> requestBody = {
        'action': 'add',
        'invoice_number': invoiceController.text.trim(),
        'customer_name': customerNameController.text.trim(),
        'mobile_number': mobileNumberController.text.trim(),
        'sale_date': saleDateController.text.trim(),
        'total_discount': totalDiscount,
        'total_taxable_value': totalTaxableValue,
        'total_gst_amount': totalGSTAmount,
        'total_cgst_amount': totalCGSTAmount,
        'total_sgst_amount': totalSGSTAmount,
        'grand_total': grandTotal,
        'tender_amount': tenderAmount,
        'balance_amount': balanceAmount,
        'items': formattedItems,
        'admin_id': widget.userData['id'] ?? 1,
      };

      print('Sending sale with ${formattedItems.length} products');

      try {
        final response = await http.post(
          Uri.parse(_salesUrl),
          headers: {'Content-Type': 'application/json'},
          body: json.encode(requestBody),
        ).timeout(Duration(seconds: 30));

        print('Response status: ${response.statusCode}');

        // Handle JSON parsing safely
        Map<String, dynamic> data;
        try {
          data = json.decode(response.body);
        } catch (e) {
          print('JSON parsing error: $e');
          _showSnackBar('Server response error. Please try again.');
          setState(() { _isSaving = false; });
          return;
        }

        if (response.statusCode == 200) {
          if (data['status'] == 'success') {
            // Generate sale data for PDF
            final saleData = {
              'invoice_number': invoiceController.text,
              'customer_name': customerNameController.text,
              'mobile_number': mobileNumberController.text,
              'sale_date': saleDateController.text,
              'total_taxable_value': totalTaxableValue,
              'total_gst_amount': totalGSTAmount,
              'total_cgst_amount': totalCGSTAmount,
              'total_sgst_amount': totalSGSTAmount,
              'total_discount': totalDiscount,
              'grand_total': grandTotal,
              'tender_amount': tenderAmount,
              'balance_amount': balanceAmount,
              'items': formattedItems,
              'business_profile': widget.businessProfile,
              'settings': widget.settings,
            };

            // Print using selected language
            await _printInvoice(invoiceController.text, saleData);

            _autoResetForm();

            _showSnackBar('Sale completed successfully! Form reset for new sale.');

          } else {
            _showSnackBar('Error: ${data['error'] ?? 'Failed to complete sale'}');
          }
        } else {
          _showSnackBar('HTTP Error ${response.statusCode}: ${response.body}');
        }
      } catch (e) {
        print('Error in _saveAndPrint: $e');
        _showSnackBar('Network Error: $e');
      } finally {
        setState(() {
          _isSaving = false;
        });
      }
    }
  }

  void _clearForm() {
    _autoResetForm();
    _showSnackBar('Form cleared successfully!');
  }

  // Language Selection Dialog
  void _showLanguageSelectionDialog() {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: Row(
            children: [
              Icon(Icons.language, color: _primaryColor),
              SizedBox(width: 8),
              Text('Select Print Language'),
            ],
          ),
          content: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              ListTile(
                leading: Icon(Icons.language, color: _primaryColor),
                title: Text('English'),
                trailing: _selectedLanguage == 'english'
                    ? Icon(Icons.check_circle, color: _primaryColor)
                    : null,
                onTap: () {
                  setState(() {
                    _selectedLanguage = 'english';
                  });
                  Navigator.of(context).pop();
                  _showSnackBar('Print language set to English');
                },
              ),
              ListTile(
                leading: Icon(Icons.language, color: Colors.green),
                title: Text('Tamil'),
                trailing: _selectedLanguage == 'tamil'
                    ? Icon(Icons.check_circle, color: Colors.green)
                    : null,
                onTap: () {
                  setState(() {
                    _selectedLanguage = 'tamil';
                  });
                  Navigator.of(context).pop();
                  _showSnackBar('Print language set to Tamil');
                },
              ),
            ],
          ),
          actions: [
            TextButton(
              onPressed: () {
                Navigator.of(context).pop();
              },
              child: Text('Cancel'),
            ),
          ],
        );
      },
    );
  }

  // Open Settings Dialog
  void _openSettingsDialog() {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return SettingsDialog(
          currentSettings: widget.settings,
          userData: widget.userData,
          onSettingsUpdated: () {
            // Refresh settings in parent
            if (widget.onSettingsUpdated != null) {
              widget.onSettingsUpdated!();
            }
            Navigator.of(context).pop();
            _showSnackBar('Settings updated successfully!');
          },
        );
      },
    );
  }

  void _showSnackBar(String message) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(message),
        duration: Duration(seconds: 3),
        backgroundColor: _primaryColor,
        behavior: SnackBarBehavior.floating,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
      ),
    );
  }

  // Build Settings Preview
  Widget _buildSettingsPreview() {
    return GestureDetector(
      onTap: _openSettingsDialog,
      child: Container(
        margin: EdgeInsets.only(top: 4),
        padding: EdgeInsets.symmetric(horizontal: 8, vertical: 2),
        decoration: BoxDecoration(
          color: _primaryLight,
          borderRadius: BorderRadius.circular(4),
          border: Border.all(color: _primaryColor.withOpacity(0.2)),
        ),
        child: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(Icons.settings, size: 10, color: _primaryColor),
            SizedBox(width: 4),
            Text(
              'GST: ${_gstType == 'with_gst' ? 'Yes' : 'No'} | Lang: ${_language.toUpperCase()} | Receipt: ${_receiptType.toUpperCase()} | Paper: ${_paperSize.toUpperCase()} | Logo: ${_printWithLogo ? 'Yes' : 'No'}',
              style: TextStyle(fontSize: 9, color: _primaryColor, fontWeight: FontWeight.w500),
            ),
            SizedBox(width: 4),
            Icon(Icons.edit, size: 10, color: _primaryColor),
          ],
        ),
      ),
    );
  }

  // Loading button widget
  Widget _buildLoadingButton() {
    return Container(
      width: double.infinity,
      height: 55,
      decoration: BoxDecoration(
        color: _primaryColor.withOpacity(0.7),
        borderRadius: BorderRadius.circular(10),
      ),
      child: Center(
        child: Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            SizedBox(
              width: 22,
              height: 22,
              child: CircularProgressIndicator(
                strokeWidth: 3,
                valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
              ),
            ),
            SizedBox(width: 12),
            Text(
              'Saving & Printing...',
              style: TextStyle(color: Colors.white, fontSize: 16, fontWeight: FontWeight.bold),
            ),
          ],
        ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    // Get business details for display
    String businessName = widget.businessProfile['business_name']?.toString() ?? 'Your Business';
    String addressLine1 = widget.businessProfile['address_line1']?.toString() ?? '';
    String addressLine2 = widget.businessProfile['address_line2']?.toString() ?? '';
    String businessLogo = widget.businessProfile['business_logo']?.toString() ?? '';
    String signature = widget.businessProfile['signature']?.toString() ?? '';

    return Scaffold(
      backgroundColor: _backgroundColor,
      body: Form(
        key: _formKey,
        child: Padding(
          padding: const EdgeInsets.all(16.0),
          child: SingleChildScrollView(
            child: Column(
              children: [
                // Business Header Card with Logo and Details
                Card(
                  elevation: 3,
                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
                  shadowColor: _primaryColor.withOpacity(0.1),
                  child: Padding(
                    padding: const EdgeInsets.all(16.0),
                    child: Row(
                      children: [
                        // Business Logo
                        if (businessLogo.isNotEmpty && _printWithLogo)
                          Container(
                            width: 50,
                            height: 50,
                            decoration: BoxDecoration(
                              borderRadius: BorderRadius.circular(8),
                              border: Border.all(color: _primaryColor.withOpacity(0.3)),
                            ),
                            child: ClipRRect(
                              borderRadius: BorderRadius.circular(8),
                              child: Image.network(
                                '${widget.baseUrl}$businessLogo',
                                fit: BoxFit.cover,
                                errorBuilder: (context, error, stackTrace) {
                                  return Container(
                                    color: _primaryLight,
                                    child: Icon(Icons.business, color: _primaryColor),
                                  );
                                },
                              ),
                            ),
                          )
                        else if (_printWithLogo)
                          Container(
                            width: 50,
                            height: 50,
                            decoration: BoxDecoration(
                              color: _primaryLight,
                              borderRadius: BorderRadius.circular(8),
                              border: Border.all(color: _primaryColor.withOpacity(0.3)),
                            ),
                            child: Icon(Icons.business, color: _primaryColor),
                          ),

                        SizedBox(width: 12),

                        // Business Details
                        Expanded(
                          child: Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              Text(
                                businessName,
                                style: TextStyle(
                                  fontSize: 16,
                                  fontWeight: FontWeight.bold,
                                  color: _textColor,
                                ),
                              ),
                              if (addressLine1.isNotEmpty)
                                Text(
                                  addressLine1,
                                  style: TextStyle(fontSize: 12, color: _textLight),
                                ),
                              if (addressLine2.isNotEmpty)
                                Text(
                                  addressLine2,
                                  style: TextStyle(fontSize: 12, color: _textLight),
                                ),
                              // Display current settings with edit button
                              _buildSettingsPreview(),
                            ],
                          ),
                        ),

                        // Invoice Number
                        Container(
                          padding: EdgeInsets.symmetric(horizontal: 12, vertical: 6),
                          decoration: BoxDecoration(
                            color: _primaryLight,
                            borderRadius: BorderRadius.circular(20),
                            border: Border.all(color: _primaryColor.withOpacity(0.3)),
                          ),
                          child: Text(
                            invoiceController.text,
                            style: TextStyle(
                              fontSize: 12,
                              fontWeight: FontWeight.bold,
                              color: _primaryDark,
                            ),
                          ),
                        ),
                      ],
                    ),
                  ),
                ),

                SizedBox(height: 16),

                // Customer Details Card
                Card(
                  elevation: 3,
                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
                  shadowColor: _primaryColor.withOpacity(0.1),
                  child: Padding(
                    padding: const EdgeInsets.all(16.0),
                    child: Column(
                      children: [
                        Row(
                          children: [
                            Icon(Icons.person_outline, color: _primaryColor, size: 20),
                            SizedBox(width: 8),
                            Text('Customer Details', style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold, color: _textColor)),
                          ],
                        ),
                        SizedBox(height: 16),
                        Row(
                          children: [
                            Expanded(
                              child: _buildLiteBlueFormField(
                                controller: customerNameController,
                                label: 'Customer Name ',
                                icon: Icons.person,
                              ),
                            ),
                            SizedBox(width: 12),
                            Expanded(
                              child: _buildLiteBlueFormField(
                                controller: mobileNumberController,
                                label: 'Mobile Number',
                                keyboardType: TextInputType.phone,
                                icon: Icons.phone,
                              ),
                            ),
                          ],
                        ),
                        SizedBox(height: 12),
                        Row(
                          children: [
                            Expanded(
                              child: _buildLiteBlueFormField(
                                controller: invoiceController,
                                label: 'Invoice Number ',
                                isRequired: true,
                                icon: Icons.receipt,
                              ),
                            ),
                            SizedBox(width: 12),
                            Expanded(
                              child: _buildLiteBlueFormField(
                                controller: saleDateController,
                                label: 'Sale Date *',
                                isRequired: true,
                                icon: Icons.calendar_today,
                              ),
                            ),
                          ],
                        ),
                      ],
                    ),
                  ),
                ),

                SizedBox(height: 16),

                // Products Card
                Card(
                  elevation: 3,
                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
                  shadowColor: _primaryColor.withOpacity(0.1),
                  child: Padding(
                    padding: const EdgeInsets.all(16.0),
                    child: Column(
                      children: [
                        Row(
                          children: [
                            Icon(Icons.shopping_basket_outlined, color: _primaryColor, size: 20),
                            SizedBox(width: 8),
                            Text('Products', style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold, color: _textColor)),
                            Spacer(),
                            SizedBox(width: 8),
                            // Language Selection Button
                            Container(
                              margin: EdgeInsets.only(right: 8),
                              child: ElevatedButton.icon(
                                onPressed: _showLanguageSelectionDialog,
                                icon: Icon(Icons.language, size: 16),
                                label: Text(
                                  _selectedLanguage == 'english' ? 'EN' : 'TA',
                                  style: TextStyle(fontSize: 12, fontWeight: FontWeight.bold),
                                ),
                                style: ElevatedButton.styleFrom(
                                  backgroundColor: _selectedLanguage == 'english' ? _primaryColor : Colors.green,
                                  foregroundColor: Colors.white,
                                  padding: EdgeInsets.symmetric(horizontal: 12, vertical: 8),
                                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
                                  elevation: 2,
                                ),
                              ),
                            ),
                            ElevatedButton.icon(
                              onPressed: _addProductItem,
                              icon: Icon(Icons.add, size: 18),
                              label: Text('Add Product', style: TextStyle(fontSize: 13)),
                              style: ElevatedButton.styleFrom(
                                backgroundColor: _primaryColor,
                                foregroundColor: Colors.white,
                                padding: EdgeInsets.symmetric(horizontal: 16, vertical: 10),
                                shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
                                elevation: 2,
                              ),
                            ),
                          ],
                        ),
                        SizedBox(height: 16),

                        // Product List with Enhanced Search and Barcode Scanning
                        ...saleItems.asMap().entries.map((entry) {
                          int index = entry.key;
                          Map<String, dynamic> item = entry.value;

                          return Container(
                            margin: EdgeInsets.only(bottom: 12),
                            padding: EdgeInsets.all(12),
                            decoration: BoxDecoration(
                              color: _primaryLight,
                              borderRadius: BorderRadius.circular(8),
                              border: Border.all(color: _primaryColor.withOpacity(0.1)),
                            ),
                            child: Column(
                              children: [
                                Row(
                                  children: [
                                    Icon(Icons.inventory_2_outlined, size: 16, color: _primaryColor),
                                    SizedBox(width: 6),
                                    Text('Product ${index + 1}', style: TextStyle(fontWeight: FontWeight.bold, fontSize: 13, color: _textColor)),
                                    Spacer(),
                                    if (saleItems.length > 1)
                                      IconButton(
                                        icon: Icon(Icons.remove_circle_outlined, size: 18),
                                        onPressed: () => _removeProductItem(index),
                                        color: Colors.red,
                                        padding: EdgeInsets.zero,
                                      ),
                                  ],
                                ),
                                SizedBox(height: 8),

                                // Enhanced Product Search Field with Barcode Scanner
                                _buildProductSearchField(index),
                                SizedBox(height: 8),

                                // Display barcode if available
                                if (item['barcode'] != null && item['barcode'].toString().isNotEmpty)
                                  Container(
                                    padding: EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                                    decoration: BoxDecoration(
                                      color: _backgroundColor,
                                      borderRadius: BorderRadius.circular(4),
                                      border: Border.all(color: _primaryColor.withOpacity(0.2)),
                                    ),
                                    child: Row(
                                      children: [
                                        Icon(Icons.qr_code, size: 12, color: _primaryColor),
                                        SizedBox(width: 4),
                                        Text(
                                          'Barcode: ${item['barcode']}',
                                          style: TextStyle(fontSize: 10, color: _textLight),
                                        ),
                                      ],
                                    ),
                                  ),

                                SizedBox(height: 8),

                                // Quantity, Price, Discount, GST (conditional)
                                Row(
                                  children: [
                                    Expanded(
                                      child: _buildLiteBlueNumberField(
                                        value: item['quantity'].toDouble(),
                                        label: 'Qty',
                                        onChanged: (value) => _updateProductItem(index, 'quantity', value.toInt()),
                                        index: index,
                                      ),
                                    ),
                                    SizedBox(width: 8),
                                    Expanded(
                                      child: Column(
                                        crossAxisAlignment: CrossAxisAlignment.start,
                                        children: [
                                          Text('Price', style: TextStyle(fontSize: 11, color: _textColor, fontWeight: FontWeight.w600)),
                                          SizedBox(height: 4),
                                          Container(
                                            height: 38,
                                            decoration: BoxDecoration(
                                              color: _cardColor,
                                              borderRadius: BorderRadius.circular(6),
                                              border: Border.all(color: _primaryColor.withOpacity(0.2)),
                                            ),
                                            child: TextField(
                                              keyboardType: TextInputType.numberWithOptions(decimal: true),
                                              onChanged: (text) {
                                                double newValue = double.tryParse(text) ?? 0.0;
                                                _updateProductItem(index, 'price_incl_gst', newValue);
                                              },
                                              style: TextStyle(fontSize: 12, color: _textColor),
                                              decoration: InputDecoration(
                                                border: InputBorder.none,
                                                contentPadding: EdgeInsets.symmetric(horizontal: 8, vertical: 10),
                                                filled: true,
                                                fillColor: _cardColor,
                                              ),
                                              controller: TextEditingController(text: item['price_incl_gst'].toStringAsFixed(2)),
                                            ),
                                          ),
                                        ],
                                      ),
                                    ),
                                    SizedBox(width: 8),
                                    Expanded(
                                      child: Column(
                                        crossAxisAlignment: CrossAxisAlignment.start,
                                        children: [
                                          Text('Disc %', style: TextStyle(fontSize: 11, color: _textColor, fontWeight: FontWeight.w600)),
                                          SizedBox(height: 4),
                                          Container(
                                            height: 38,
                                            decoration: BoxDecoration(
                                              color: _cardColor,
                                              borderRadius: BorderRadius.circular(6),
                                              border: Border.all(color: _primaryColor.withOpacity(0.2)),
                                            ),
                                            child: TextField(
                                              keyboardType: TextInputType.numberWithOptions(decimal: true),
                                              onChanged: (text) {
                                                double newValue = double.tryParse(text) ?? 0.0;
                                                _updateProductItem(index, 'discount', newValue);
                                              },
                                              style: TextStyle(fontSize: 12, color: _textColor),
                                              decoration: InputDecoration(
                                                border: InputBorder.none,
                                                contentPadding: EdgeInsets.symmetric(horizontal: 8, vertical: 10),
                                                filled: true,
                                                fillColor: _cardColor,
                                              ),
                                              controller: TextEditingController(text: item['discount'].toStringAsFixed(2)),
                                            ),
                                          ),
                                        ],
                                      ),
                                    ),
                                    SizedBox(width: 8),
                                    _buildGSTTypeDropdown(index), // Conditional GST field
                                  ],
                                ),
                                SizedBox(height: 8),

                                // Amounts
                                Row(
                                  children: [
                                    Expanded(
                                      child: Container(
                                        padding: EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                                        decoration: BoxDecoration(
                                          color: _backgroundColor,
                                          borderRadius: BorderRadius.circular(4),
                                        ),
                                        child: Text(
                                          'Taxable: ₹${item['taxable_amount'].toStringAsFixed(2)}',
                                          style: TextStyle(fontSize: 11, color: _textColor, fontWeight: FontWeight.w500),
                                        ),
                                      ),
                                    ),
                                    SizedBox(width: 8),
                                    Expanded(
                                      child: Container(
                                        padding: EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                                        decoration: BoxDecoration(
                                          color: _primaryColor.withOpacity(0.1),
                                          borderRadius: BorderRadius.circular(4),
                                        ),
                                        child: Text(
                                          'Total: ₹${item['total_amount'].toStringAsFixed(2)}',
                                          style: TextStyle(fontSize: 11, fontWeight: FontWeight.bold, color: _primaryColor),
                                        ),
                                      ),
                                    ),
                                  ],
                                ),
                              ],
                            ),
                          );
                        }).toList(),
                      ],
                    ),
                  ),
                ),

                SizedBox(height: 16),

                // Summary Card
                Card(
                  elevation: 3,
                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
                  shadowColor: _primaryColor.withOpacity(0.1),
                  child: Padding(
                    padding: const EdgeInsets.all(16.0),
                    child: Column(
                      children: [
                        Row(
                          children: [
                            Icon(Icons.calculate_outlined, color: _primaryColor, size: 20),
                            SizedBox(width: 8),
                            Text('Summary', style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold, color: _textColor)),
                          ],
                        ),
                        SizedBox(height: 12),
                        _buildLiteBlueSummaryRow('Total Taxable Value:', '₹${totalTaxableValue.toStringAsFixed(2)}'),
                        if (_gstType == 'with_gst') ...[
                          // Only show GST details if GST is enabled
                          _buildLiteBlueSummaryRow('Total GST Amount:', '₹${totalGSTAmount.toStringAsFixed(2)}'),
                          _buildLiteBlueSummaryRow(
                              'CGST Amount:',
                              '₹${totalCGSTAmount.toStringAsFixed(2)}'
                          ),

                          _buildLiteBlueSummaryRow(
                              'SGST Amount:',
                              '₹${totalCGSTAmount.toStringAsFixed(2)}'
                          ),
                        ],
                        _buildLiteBlueSummaryRow('Total Discount:', '₹${totalDiscount.toStringAsFixed(2)}'),
                        Divider(height: 12, color: _primaryLight),
                        _buildLiteBlueSummaryRow(
                            'GRAND TOTAL:',
                            '₹${grandTotal.toStringAsFixed(2)}',
                            style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold, color: _primaryColor)
                        ),
                      ],
                    ),
                  ),
                ),

                SizedBox(height: 16),

                // Tender & Balance Card
                Card(
                  elevation: 3,
                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
                  shadowColor: _primaryColor.withOpacity(0.1),
                  child: Padding(
                    padding: const EdgeInsets.all(16.0),
                    child: Column(
                      children: [
                        Row(
                          children: [
                            Icon(Icons.payment_outlined, color: _primaryColor, size: 20),
                            SizedBox(width: 8),
                            Text('Payment Details', style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold, color: _textColor)),
                          ],
                        ),
                        SizedBox(height: 16),
                        Row(
                          children: [
                            Expanded(
                              child: _buildLiteBlueFormField(
                                controller: tenderAmountController,
                                label: 'Tender Amount *',
                                isRequired: true,
                                icon: Icons.currency_rupee,
                                keyboardType: TextInputType.numberWithOptions(decimal: true),
                              ),
                            ),
                            SizedBox(width: 12),
                            Expanded(
                              child: Column(
                                crossAxisAlignment: CrossAxisAlignment.start,
                                children: [
                                  Text(
                                    'Balance Amount',
                                    style: TextStyle(fontWeight: FontWeight.w600, color: _textColor, fontSize: 13),
                                  ),
                                  SizedBox(height: 6),
                                  Container(
                                    height: 44,
                                    decoration: BoxDecoration(
                                      color: balanceAmount >= 0 ? Color(0xFFE8F5E8) : Color(0xFFFFEBEE),
                                      borderRadius: BorderRadius.circular(8),
                                      border: Border.all(
                                        color: balanceAmount >= 0 ? Colors.green : Colors.red,
                                        width: 1,
                                      ),
                                    ),
                                    child: Center(
                                      child: Text(
                                        '₹${balanceAmount.toStringAsFixed(2)}',
                                        style: TextStyle(
                                          fontSize: 14,
                                          fontWeight: FontWeight.bold,
                                          color: balanceAmount >= 0 ? Colors.green : Colors.red,
                                        ),
                                      ),
                                    ),
                                  ),
                                ],
                              ),
                            ),
                          ],
                        ),
                        SizedBox(height: 12),
                        Container(
                          padding: EdgeInsets.all(12),
                          decoration: BoxDecoration(
                            color: _primaryLight,
                            borderRadius: BorderRadius.circular(8),
                          ),
                          child: Row(
                            children: [
                              Icon(
                                balanceAmount >= 0 ? Icons.check_circle : Icons.warning,
                                color: balanceAmount >= 0 ? Colors.green : Colors.orange,
                                size: 18,
                              ),
                              SizedBox(width: 8),
                              Expanded(
                                child: Text(
                                  balanceAmount >= 0
                                      ? 'Payment completed. Balance to return: ₹${balanceAmount.toStringAsFixed(2)}'
                                      : 'Insufficient tender amount. Short by: ₹${balanceAmount.abs().toStringAsFixed(2)}',
                                  style: TextStyle(
                                    color: balanceAmount >= 0 ? Colors.green : Colors.orange,
                                    fontSize: 12,
                                    fontWeight: FontWeight.w500,
                                  ),
                                ),
                              ),
                            ],
                          ),
                        ),
                      ],
                    ),
                  ),
                ),

                SizedBox(height: 20),

                // Action Buttons
                Row(
                  children: [
                    Expanded(
                      child: _isSaving
                          ? _buildLoadingButton()
                          : ElevatedButton(
                        onPressed: _saveAndPrint,
                        style: ElevatedButton.styleFrom(
                          backgroundColor: _primaryColor,
                          foregroundColor: Colors.white,
                          minimumSize: Size(double.infinity, 55),
                          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10)),
                          elevation: 3,
                          shadowColor: _primaryColor.withOpacity(0.3),
                          padding: EdgeInsets.symmetric(horizontal: 24, vertical: 12),
                        ),
                        child: Row(
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: [
                            Icon(Icons.save_alt, size: 20),
                            SizedBox(width: 10),
                            Text('Save & Print Invoice ($_selectedLanguage)', style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold)),
                            SizedBox(width: 10),
                            Icon(Icons.print, size: 20),
                          ],
                        ),
                      ),
                    ),
                  ],
                ),

                SizedBox(height: 20),
              ],
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildLiteBlueFormField({
    required TextEditingController controller,
    required String label,
    required IconData icon,
    bool isRequired = false,
    TextInputType keyboardType = TextInputType.text,
  }) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Row(
          children: [
            Text(
              label,
              style: TextStyle(fontWeight: FontWeight.w600, color: _textColor, fontSize: 13),
            ),
            if (isRequired) Text(' *', style: TextStyle(color: Colors.red, fontSize: 13)),
          ],
        ),
        SizedBox(height: 6),
        Container(
          height: 44,
          decoration: BoxDecoration(
            color: _cardColor,
            borderRadius: BorderRadius.circular(8),
            border: Border.all(color: _primaryColor.withOpacity(0.2)),
          ),
          child: TextField(
            controller: controller,
            keyboardType: keyboardType,
            style: TextStyle(fontSize: 14, color: _textColor),
            decoration: InputDecoration(
              border: InputBorder.none,
              contentPadding: EdgeInsets.symmetric(horizontal: 12, vertical: 12),
              prefixIcon: Icon(icon, color: _primaryColor, size: 18),
              filled: true,
              fillColor: _cardColor,
            ),
          ),
        ),
      ],
    );
  }

  Widget _buildLiteBlueSummaryRow(String label, String value, {TextStyle? style}) {
    return Padding(
      padding: EdgeInsets.symmetric(vertical: 6),
      child: Row(
        children: [
          Text(label, style: TextStyle(fontWeight: FontWeight.w600, fontSize: 14, color: _textColor)),
          Spacer(),
          Text(value, style: style ?? TextStyle(fontWeight: FontWeight.w600, fontSize: 14, color: _textColor)),
        ],
      ),
    );
  }

  @override
  void dispose() {
    tenderAmountController.removeListener(_calculateBalance);
    tenderAmountController.dispose();

    // Dispose all focus nodes
    for (var node in _productFocusNodes) {
      node.dispose();
    }
    for (var node in _quantityFocusNodes) {
      node.dispose();
    }

    super.dispose();
  }
}

// Settings Dialog for Quick Settings Update
class SettingsDialog extends StatefulWidget {
  final Map<String, dynamic> currentSettings;
  final Map<String, dynamic> userData;
  final VoidCallback onSettingsUpdated;

  const SettingsDialog({
    Key? key,
    required this.currentSettings,
    required this.userData,
    required this.onSettingsUpdated,
  }) : super(key: key);

  @override
  _SettingsDialogState createState() => _SettingsDialogState();
}

class _SettingsDialogState extends State<SettingsDialog> {
  late String _selectedReceiptType;
  late String _selectedPaperSize;
  late bool _printWithLogo;
  late bool _printWithSignature;
  bool _isSaving = false;

  @override
  void initState() {
    super.initState();
    _selectedReceiptType = widget.currentSettings['receipt_type']?.toString().toLowerCase() ?? 'thermal';
    _selectedPaperSize = widget.currentSettings['paper_size']?.toString().toLowerCase() ?? '80mm';
    _printWithLogo = (widget.currentSettings['print_with_logo']?.toString() ?? '1') == '1';
    _printWithSignature = (widget.currentSettings['print_with_signature']?.toString() ?? '1') == '1';
  }

  Future<void> _saveSettings() async {
    setState(() {
      _isSaving = true;
    });

    try {
      final response = await http.post(
        Uri.parse('http://localhost/shop_billing/Admin_register/settings.php'),
        headers: {'Content-Type': 'application/json'},
        body: jsonEncode({
          'action': 'save_settings',
          'admin_id': widget.userData['id']?.toString() ?? '1',
          'receipt_type': _selectedReceiptType,
          'paper_size': _selectedPaperSize,
          'print_with_logo': _printWithLogo ? '1' : '0',
          'print_with_signature': _printWithSignature ? '1' : '0',
        }),
      );

      if (response.statusCode == 200) {
        final responseData = jsonDecode(response.body);
        if (responseData['status'] == 'success') {
          widget.onSettingsUpdated();
        }
      }
    } catch (e) {
      print('Error saving settings: $e');
    } finally {
      setState(() {
        _isSaving = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Row(
        children: [
          Icon(Icons.settings, color: Color(0xFF3B82F6)),
          SizedBox(width: 8),
          Text('Receipt Settings'),
        ],
      ),
      content: SingleChildScrollView(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text('Receipt Type', style: TextStyle(fontWeight: FontWeight.bold)),
            SizedBox(height: 8),
            DropdownButtonFormField<String>(
              value: _selectedReceiptType,
              items: [
                DropdownMenuItem(value: 'thermal', child: Text('Thermal Receipt')),
                DropdownMenuItem(value: 'a4', child: Text('A4 Paper Receipt')),
              ],
              onChanged: (value) {
                setState(() {
                  _selectedReceiptType = value!;
                });
              },
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                contentPadding: EdgeInsets.symmetric(horizontal: 12, vertical: 8),
              ),
            ),
            SizedBox(height: 16),
            Text('Paper Size', style: TextStyle(fontWeight: FontWeight.bold)),
            SizedBox(height: 8),
            DropdownButtonFormField<String>(
              value: _selectedPaperSize,
              items: [
                DropdownMenuItem(value: '80mm', child: Text('80mm Thermal Paper')),
                DropdownMenuItem(value: '58mm', child: Text('58mm Thermal Paper')),
                DropdownMenuItem(value: 'a4', child: Text('A4 Paper')),
              ],
              onChanged: (value) {
                setState(() {
                  _selectedPaperSize = value!;
                });
              },
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                contentPadding: EdgeInsets.symmetric(horizontal: 12, vertical: 8),
              ),
            ),
            SizedBox(height: 16),
            Row(
              children: [
                Checkbox(
                  value: _printWithLogo,
                  onChanged: (value) {
                    setState(() {
                      _printWithLogo = value!;
                      // 🔥 AUTO-DISABLE SIGNATURE WHEN LOGO IS DISABLED
                      if (!_printWithLogo) {
                        _printWithSignature = false;
                      }
                    });
                  },
                ),
                SizedBox(width: 8),
                Text('Print with Logo', style: TextStyle(fontWeight: FontWeight.bold)),
              ],
            ),
            SizedBox(height: 8),
            Row(
              children: [
                Checkbox(
                  value: _printWithSignature,
                  onChanged: _printWithLogo ? (value) { // 🔥 ONLY ENABLE IF LOGO IS ON
                    setState(() {
                      _printWithSignature = value!;
                    });
                  } : null,
                ),
                SizedBox(width: 8),
                Text(
                  'Print with Signature',
                  style: TextStyle(
                    fontWeight: FontWeight.bold,
                    color: _printWithLogo ? Colors.black : Colors.grey, // 🔥 GREY OUT WHEN DISABLED
                  ),
                ),
              ],
            ),
            if (!_printWithLogo) // 🔥 SHOW INFO MESSAGE WHEN DISABLED
              Padding(
                padding: EdgeInsets.only(top: 8, left: 8),
                child: Text(
                  'Signature is only available when Logo is enabled',
                  style: TextStyle(fontSize: 12, color: Colors.orange, fontStyle: FontStyle.italic),
                ),
              ),
          ],
        ),
      ),
      actions: [
        TextButton(
          onPressed: () {
            Navigator.of(context).pop();
          },
          child: Text('Cancel'),
        ),
        ElevatedButton(
          onPressed: _isSaving ? null : _saveSettings,
          style: ElevatedButton.styleFrom(
            backgroundColor: Color(0xFF3B82F6),
          ),
          child: _isSaving
              ? SizedBox(
            width: 16,
            height: 16,
            child: CircularProgressIndicator(
              strokeWidth: 2,
              valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
            ),
          )
              : Text('Save'),
        ),
      ],
    );
  }
}