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

import 'package:cheminova/models/get_pd_rd_response.dart';
import 'package:cheminova/provider/pd_rd_provider.dart';
import 'package:cheminova/widgets/common_app_bar.dart';
import 'package:cheminova/widgets/common_background.dart';
import 'package:cheminova/widgets/common_drawer.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

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

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

class _UpdateInventoryScreenState extends State<UpdateInventoryScreen> {
  late PdRdProvider pdRdProvider;

  @override
  void initState() {
    super.initState();
    pdRdProvider = PdRdProvider();
  }

  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider(
        create: (context) => pdRdProvider,
        child: 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(),
                body: Stack(children: [
                  Consumer<PdRdProvider>(
                      builder: (context, value, child) => Column(children: [
                            Padding(
                                padding: const EdgeInsets.symmetric(
                                    horizontal: 15.0, vertical: 25),
                                child: DropdownButtonFormField<String>(
                                    decoration: const InputDecoration(
                                        fillColor: Colors.white,
                                        filled: true,
                                        border: OutlineInputBorder()),
                                    value: value.selectedDistributorType,
                                    items: [
                                      'Principal Distributor',
                                      'Retail Distributor'
                                    ].map((String type) {
                                      return DropdownMenuItem<String>(
                                          value: type, child: Text(type));
                                    }).toList(),
                                    hint: const Text('Select Distributor Type'),
                                    onChanged: (val) =>
                                        value.updateDistributorType(val))),
                            Padding(
                                padding: const EdgeInsets.symmetric(
                                    horizontal: 15.0, vertical: 25),
                                child: DropdownButtonFormField<GetPdRdResponse>(
                                    decoration: const InputDecoration(
                                        fillColor: Colors.white,
                                        filled: true,
                                        border: OutlineInputBorder()),
                                    value: value.selectedPdRd,
                                    items: value.pdRdList.map((e) {
                                      return DropdownMenuItem<GetPdRdResponse>(
                                          value: e, child: Text(e.name ?? ''));
                                    }).toList(),
                                    onChanged: (val) =>
                                        value.updatePdRdValue(val),
                                    // Disable the dropdown if no distributor type is selected
                                    isExpanded: true,
                                    isDense: true,
                                    iconSize: 24,
                                    hint:
                                        const Text('Select Distributor Name')))
                          ])),
                  Consumer<PdRdProvider>(
                      builder: (context, value, child) => value.isLoading
                          ? Container(
                              color: Colors.black12,
                              child: const Center(
                                  child: CircularProgressIndicator()))
                          : const SizedBox())
                ]))));
  }
}

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),
                ),
              ),
          ],
        ),
      ),
    );
  }
}