pharmacy_mobile/lib/pages/add_generics.dart

import 'package:gap/gap.dart';
import 'package:flutter/material.dart';
import 'package:internet_connection_checker/internet_connection_checker.dart';
import 'package:pharmacy_mobile/tables/ref_categories.dart';
import 'package:pharmacy_mobile/tables/ref_generic_names.dart';
import 'package:pharmacy_mobile/widgets/button_widget.dart';
import 'package:pharmacy_mobile/widgets/dropdown_widget.dart';
import 'package:pharmacy_mobile/widgets/form_border_widget.dart';
import 'package:pharmacy_mobile/widgets/input_widget.dart';
import 'package:pharmacy_mobile/widgets/page_background_widget.dart';
import 'package:pharmacy_mobile/widgets/snackbar_widget.dart';
import 'package:pharmacy_mobile/widgets/text_widget.dart';
import 'package:pharmacy_mobile/widgets/title_widget.dart';
import 'package:go_router/go_router.dart';

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

  @override
  State<AddGenericsPage> createState() => _AddGenericsPageState();
}

class _AddGenericsPageState extends State<AddGenericsPage> {
  final _refCategories = RefCategories();
  final _refGenericNames = RefGenericNames();
  final _nameController = TextEditingController();
  final _formKey = GlobalKey<FormState>();

  bool _isLoading = false;

  late List _categoryList = [];
  late String _selectedCategory = '';
  late String _categoryUUID = '';

  void _getList() async {
    _categoryList = await _refCategories.getList();

    if (_categoryList.isEmpty) {
      if (mounted) {
        showNotification(context, 'Error: No Categories Found', false);

        WidgetsBinding.instance.addPostFrameCallback((_) {
          if (mounted) {
            context.push('/main');
          }
        });
      }
    } else {
      setState(() => {});
    }
  }

  void autoRun() async {
    if (await InternetConnectionChecker.instance.hasConnection) {
      _getList();
    } else {
      if (mounted) {
        showNotification(context, 'Error: No Internet Connection', false);

        WidgetsBinding.instance.addPostFrameCallback((_) {
          if (mounted) {
            context.push('/main');
          }
        });
      }
    }
  }

  void _updateCategory(dynamic category) {
    _selectedCategory = category;
  }

  void saveGeneric() async {
    setState(() => _isLoading = true);

    try {
      if (await InternetConnectionChecker.instance.hasConnection) {
        _categoryUUID = await _refCategories.getUUID(_selectedCategory);

        await _refGenericNames.postGeneric(_nameController.text, _categoryUUID);

        if (mounted) {
          showNotification(context, 'Generic Name Saved', true);

          WidgetsBinding.instance.addPostFrameCallback((_) {
            if (mounted) {
              context.push('/main');
            }
          });
        }
      } else {
        if (mounted) {
          showNotification(context, 'Error: No Internet Connection', false);
        }
      }
    } catch (e) {
      if (mounted) {
        showNotification(context, 'Error: $e', false);
      }
    } finally {
      setState(() => _isLoading = false);
    }
  }

  @override
  void initState() {
    autoRun();
    super.initState();
  }

  @override
  void dispose() {
    _nameController.dispose();
    _categoryList = [];
    _selectedCategory = '';
    _categoryUUID = '';
    _isLoading = false;
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: PageBackgroundWidget(
        child: Center(
            child: Column(
          children: [
            const Gap(96),
            const TitleWidget(firstTextSize: 20, secondTextSize: 32),
            const Gap(32),
            const TextWidget(text: 'Add Generics'),
            const Gap(16),
            FormBorderWidget(
              color: 'blue',
              child: Form(
                  key: _formKey,
                  child: Column(
                    children: [
                      InputWidget(label: 'Name', controller: _nameController),
                      const Gap(16),
                      if (_categoryList.isEmpty)
                        Column(
                          children: [
                            const Gap(8),
                            Row(
                              mainAxisAlignment: MainAxisAlignment.center,
                              crossAxisAlignment: CrossAxisAlignment.center,
                              spacing: 16,
                              children: [
                                CircularProgressIndicator(color: Colors.white),
                                TextWidget(
                                  text: 'Fetching Categories',
                                  size: 16,
                                )
                              ],
                            ),
                          ],
                        )
                      else
                        Column(
                          children: [
                            DropDownWidget(
                                label: 'Category',
                                list: _categoryList,
                                listTitle: 'category_name',
                                onChanged: _updateCategory),
                            const Gap(32),
                            if (_isLoading)
                              Center(child: CircularProgressIndicator(color: Colors.white))
                            else
                              ButtonWidget(text: 'Add', onPressed: saveGeneric)
                          ],
                        ),
                    ],
                  )),
            )
          ],
        )),
      ),
    );
  }
}