cdb_ui/lib/pages/supply.dart

import 'package:cdb_ui/api.dart';
import 'package:flutter/material.dart';
import 'package:qr_bar_code_scanner_dialog/qr_bar_code_scanner_dialog.dart';

class SupplyPage extends StatefulWidget {
  final Item item;
  Function refresh;

  SupplyPage(this.item, this.refresh, {super.key});

  @override
  State<SupplyPage> createState() => _SupplyPageState();
}

class _SupplyPageState extends State<SupplyPage> {
  late String variant;
  final _formKey = GlobalKey<FormState>();
  String _selectedOrigin = "";
  String _selectedLocation = "";
  String _price = "";

  @override
  void initState() {
    super.initState();
    variant = widget.item.variants.keys.first;
  }

  Future<void> _supply() async {
    if (_formKey.currentState!.validate()) {
      _formKey.currentState!.save();

      await API().supplyItem(widget.item.name, variant, "${_price} €",
          _selectedOrigin, _selectedLocation);

      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Item added successfully!')),
      );
      Navigator.of(context).pop();
      widget.refresh();
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Add New Item'),
      ),
      body: FutureBuilder(
        future: _fetchData(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return const Center(child: CircularProgressIndicator());
          }

          var data = snapshot.data as Map<String, List<dynamic>>;
          var locations = data['locations']!;
          var origins = data['origins']! as List<String>;

          return Padding(
            padding: const EdgeInsets.all(16.0),
            child: Form(
              key: _formKey,
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  // Variant Selection
                  DropdownButtonFormField<String>(
                    hint: const Text('Select Variant'),
                    value: variant,
                    onChanged: (value) {
                      setState(() {
                        variant = value!;
                      });
                    },
                    items: widget.item.variants.entries.map((entry) {
                      return DropdownMenuItem<String>(
                        value: entry.key,
                        child: Text(entry.value.name),
                      );
                    }).toList(),
                    onSaved: (value) {
                      variant = value!;
                    },
                  ),

                  const SizedBox(height: 16),

                  // Origin Field with Dropdown and Text Input
                  Autocomplete<String>(
                    optionsBuilder: (TextEditingValue textEditingValue) {
                      if (textEditingValue.text.isEmpty) {
                        return origins;
                      }
                      return origins.where((String option) {
                        return option
                            .toLowerCase()
                            .contains(textEditingValue.text.toLowerCase());
                      });
                    },
                    onSelected: (String selection) {
                      setState(() {
                        _selectedOrigin = selection;
                      });
                    },
                    fieldViewBuilder: (context, textEditingController,
                        focusNode, onFieldSubmitted) {
                      textEditingController.text = _selectedOrigin;
                      return TextFormField(
                        onChanged: (value) {
                          _selectedOrigin = value;
                        },
                        controller: textEditingController,
                        focusNode: focusNode,
                        decoration: const InputDecoration(
                          labelText: 'Origin',
                          border: OutlineInputBorder(),
                        ),
                      );
                    },
                  ),

                  const SizedBox(height: 16),

                  // Price Field
                  TextFormField(
                    decoration: const InputDecoration(labelText: 'Price'),
                    keyboardType: TextInputType.number,
                    initialValue: _price,
                    validator: (value) {
                      if (value == null || value.isEmpty) {
                        return 'Please enter a price';
                      }
                      if (double.tryParse(value) == null) {
                        return 'Please enter a valid number';
                      }
                      return null;
                    },
                    onSaved: (value) {
                      _price = value!;
                    },
                  ),

                  const SizedBox(height: 16),

                  // Location Dropdown
                  DropdownButtonFormField<String>(
                    hint: const Text('Select Location'),
                    value: _selectedLocation,
                    onChanged: (value) {
                      setState(() {
                        _selectedLocation = value!;
                      });
                    },
                    items: locations.map<DropdownMenuItem<String>>((location) {
                      return DropdownMenuItem<String>(
                        value: location,
                        child: Text(location),
                      );
                    }).toList(),
                    onSaved: (value) {
                      _selectedLocation = value!;
                    },
                  ),

                  IconButton(
                    onPressed: () {
                      QrBarCodeScannerDialog().getScannedQrBarCode(
                        context: context,
                        onCode: (code) {
                          setState(() {
                            _selectedLocation = code!;
                          });
                        },
                      );
                    },
                    icon: const Icon(Icons.qr_code),
                  ),

                  const SizedBox(height: 20),

                  // Submit Button
                  ElevatedButton(
                    onPressed: _supply,
                    child: const Text('Add Item'),
                  ),
                ],
              ),
            ),
          );
        },
      ),
    );
  }

  Future<Map<String, List<dynamic>>> _fetchData() async {
    var locations_map = await API().getLocations();
    var origins = await API().getUniqueField(widget.item.id, variant, "origin");
    origins.insert(0, "");
    var locations = locations_map.keys.toList();
    locations.insert(0, "");
    return {'locations': locations, 'origins': origins};
  }
}