sc-android-app/lib/screens/update_inventory_screen.dart

import 'package:cheminova/screens/Add_products_screen.dart';
import 'package:flutter/material.dart';
import 'package:cheminova/widgets/common_background.dart';
import 'package:cheminova/widgets/common_app_bar.dart';
import 'package:cheminova/widgets/common_drawer.dart';
import 'package:cheminova/widgets/common_elevated_button.dart';
import 'package:cheminova/screens/data_submit_successfull.dart';

class UpdateInventoryScreen extends StatefulWidget {
  const UpdateInventoryScreen({super.key});

  @override
  State<UpdateInventoryScreen> createState() => _UpdateInventoryScreenState();
}

class _UpdateInventoryScreenState extends State<UpdateInventoryScreen> {
  final List<Product> products = [
    Product(name: 'Product A', sku: 'SKU001', isPurchased: true),
    Product(name: 'Product B', sku: 'SKU002', isPurchased: true),
    Product(name: 'Product C', sku: 'SKU003', isPurchased: false),
  ];

  List<Product> selectedProducts = [];
  List<Product> filteredProducts = [];
  final List<String> principalDistributors = ['vaibhav', 'sonu', 'monu'];
  final List<String> retailerDistributors = ['shivam', 'vivek'];
  String? selectedDistributorType;
  String? selectedDistributor;
  final searchController = TextEditingController();

  @override
  void initState() {
    super.initState();
    filteredProducts = products;
  }

  void filterProducts(String query) {
    setState(() {
      filteredProducts = products.where((product) {
        final productNameLower = product.name.toLowerCase();
        final productSkuLower = product.sku.toLowerCase();
        final searchLower = query.toLowerCase();

        return productNameLower.contains(searchLower) ||
            productSkuLower.contains(searchLower);
      }).toList();
    });
  }

  @override
  Widget build(BuildContext context) {
    return CommonBackground(
      child: Scaffold(
        backgroundColor: Colors.transparent,
        appBar: CommonAppBar(
          actions: [
            IconButton(
              onPressed: () {
                Navigator.pop(context);
              },
              icon: Image.asset('assets/Back_attendance.png'),
              padding: const EdgeInsets.only(right: 20),
            ),
          ],
          title: const Text('Update Inventory Data',
              style: TextStyle(
                  fontSize: 20,
                  color: Colors.black,
                  fontWeight: FontWeight.w400,
                  fontFamily: 'Anek')),
          backgroundColor: Colors.transparent,
          elevation: 0,
        ),
        drawer: const CommonDrawer(),
        bottomNavigationBar: Padding(
          padding: const EdgeInsets.all(16.0),
          child: CommonElevatedButton(
            borderRadius: 30,
            width: double.infinity,
            height: kToolbarHeight - 10,
            text: 'SUBMIT',
            backgroundColor: const Color(0xff004791),
            onPressed: () {
              Navigator.push(
                context,
                MaterialPageRoute(
                  builder: (context) => const AddProductsScreen(),
                ),
              );
            },
          ),
        ),
        body: Stack(
          children: [
            Column(
              children: [
                // Dropdown for selecting distributor type
                Padding(
                  padding: const EdgeInsets.symmetric(horizontal: 15.0, vertical: 25),
                  child: DropdownButtonFormField<String>(
                    decoration: const InputDecoration(
                      labelText: 'Select Distributor Type',
                      fillColor: Colors.white,
                      filled: true,
                      border: OutlineInputBorder(),
                    ),
                    value: selectedDistributorType,
                    items: ['Principal Distributor', 'Retailer Distributor'].map((String type) {
                      return DropdownMenuItem<String>(
                        value: type,
                        child: Text(type),
                      );
                    }).toList(),
                    onChanged: (value) {
                      setState(() {
                        selectedDistributorType = value;
                        selectedDistributor = null; // Reset distributor selection when type changes
                      });
                    },
                  ),
                ),
                // Dropdown for selecting distributor name based on type
                Padding(
                  padding: const EdgeInsets.symmetric(horizontal: 15.0, vertical: 25),
                  child: DropdownButtonFormField<String>(
                    decoration: const InputDecoration(
                      labelText: 'Select Distributor Name',
                      fillColor: Colors.white,
                      filled: true,
                      border: OutlineInputBorder(),
                    ),
                    value: selectedDistributor,
                    items: (selectedDistributorType == 'Principal Distributor'
                        ? principalDistributors
                        : retailerDistributors)
                        .map((String distributor) {
                      return DropdownMenuItem<String>(
                        value: distributor,
                        child: Text(distributor),
                      );
                    }).toList(),
                    onChanged: (value) {
                      setState(() {
                        selectedDistributor = value;
                      });
                    },
                    // Disable the dropdown if no distributor type is selected
                    isExpanded: true,
                    isDense: true,
                    iconSize: 24,
                    hint: Text(
                        'Please select a ${selectedDistributorType ?? "Distributor Type"} first'),
                  ),
                ),
                // Show the selected products
                if (selectedProducts.isNotEmpty)
                  Expanded(
                    child: ListView.builder(
                      itemCount: selectedProducts.length,
                      itemBuilder: (context, index) {
                        return ProductBlock(product: selectedProducts[index]);
                      },
                    ),
                  ),
              ],
            ),
          ],
        ),
      ),
    );
  }
}

class Product {
  final String name;
  final String sku;
  final bool isPurchased;
  int? sale;
  int? inventory;

  Product({
    required this.name,
    required this.sku,
    required this.isPurchased,
    this.sale,
    this.inventory,
  });
}

class ProductBlock extends StatefulWidget {
  final Product product;

  const ProductBlock({super.key, required this.product});

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

class _ProductBlockState extends State<ProductBlock> {
  final saleController = TextEditingController();
  final inventoryController = TextEditingController();
  String? errorMessage;

  @override
  void initState() {
    super.initState();
    saleController.text = widget.product.sale?.toString() ?? '';
    inventoryController.text = widget.product.inventory?.toString() ?? '';
  }

  void validateInput() {
    setState(() {
      if (saleController.text.isNotEmpty && inventoryController.text.isNotEmpty) {
        int sale = int.parse(saleController.text);
        int inventory = int.parse(inventoryController.text);
        if (inventory > sale) {
          errorMessage = 'Inventory should be less than or equal to sales';
        } else {
          errorMessage = null;
        }
      } else {
        errorMessage = null;
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return Card(
      color: !widget.product.isPurchased ? Colors.white54 : Colors.white,
      margin: const EdgeInsets.all(8),
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text('Product: ${widget.product.name}', style: const TextStyle(fontSize: 16)),
            Text('SKU: ${widget.product.sku}', style: const TextStyle(fontSize: 15)),
            const SizedBox(height: 8),
            TextField(
              controller: saleController,
              decoration: const InputDecoration(labelText: 'Sale'),
              keyboardType: TextInputType.number,
              enabled: widget.product.isPurchased,
              onChanged: (_) => validateInput(),
            ),
            TextField(
              controller: inventoryController,
              decoration: const InputDecoration(labelText: 'Inventory'),
              keyboardType: TextInputType.number,
              enabled: widget.product.isPurchased,
              onChanged: (_) => validateInput(),
            ),
            if (errorMessage != null)
              Padding(
                padding: const EdgeInsets.only(top: 8.0),
                child: Text(
                  errorMessage!,
                  style: const TextStyle(color: Colors.red),
                ),
              ),
          ],
        ),
      ),
    );
  }
}