configuration.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'datamodel.dart';

Future<List<Device>> updateDevices(int collectionId) async {
  debugPrint("Start HTTP GET Collection Devices. Collection Id: " + collectionId.toString());
  String url = 'https://sensor.awi.de/rest/sensors/collections/getItemsOfCollection/' + collectionId.toString();

  // Get Access to local device and current event store.
  DeviceStoreInstance availableDevices = DeviceStoreInstance();
  EventCurrentInstance currentEvent = EventCurrentInstance();

  final response = await http
      .get(Uri.parse(url));

  debugPrint("Got something via Sensor Rest...");

  List<Device> collectionDevices = [];

  if (response.statusCode == 200) {
    // If the server did return a 200 OK response, then parse the JSON.
    List<dynamic> data = json.decode(response.body);
    for (var entry in data) {
      collectionDevices.add(Device.fromJson(entry));
    }

    debugPrint("Got the following devices: ");
    for (var device in collectionDevices){
      debugPrint(device.toString());
    }

    /*Update to local event store*/
    availableDevices.store = collectionDevices;
    //Update id and urn in add event widget
    currentEvent.store.id = collectionDevices[0].id;
    currentEvent.store.urn = collectionDevices[0].urn;

    return collectionDevices;
  } else {
    // If the server did not return a 200 OK response,
    // then throw an exception.
    throw Exception('Failed to load Collection');
  }
}

Future<List<Collection>> fetchCollections() async {
  debugPrint("Fetching Collections...");
  List<Collection> collectionList = [];
  final response = await http
      .get(Uri.parse('https://sensor.awi.de/rest/sensors/collections/getAllCollections?pointInTime=2018-07-03T12%3A30%3A55.389Z'));

  if (response.statusCode == 200) {
    return (json.decode(response.body) as List)
        .map((i) => Collection.fromJson(i))
        .toList();

  } else {
    // If the server did not return a 200 OK response,
    // then throw an exception.
    //throw Exception('Failed to load Collection');
    debugPrint('Failed to load Collection');
    return collectionList;
  }
}


class Configuration extends StatefulWidget {
  const Configuration({Key? key}) : super(key: key);

  @override
  State<Configuration> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<Configuration> {

  late Future<Collection> futureCollection;
  late Future<List<Collection>> futureCollections;

  @override
  void initState() {
    super.initState();
    //futureCollection = fetchCollection();
    futureCollections = fetchCollections();
  }
  late Future<String> eventTypes;


  @override
  Widget build(BuildContext context) {
    final CollectionStoreInstance collections = CollectionStoreInstance();
    final CollectionCurrentInstance activeCollection = CollectionCurrentInstance();

    return Scaffold(
      appBar: AppBar(
        title: const Text('Configuration'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            FutureBuilder<List<Collection>>(
                future: futureCollections,
                builder: (context, snapshot){
                  if (snapshot.hasData)
                  {
                    collections.store = [];

                    //debugPrint('Got Collections:');
                    snapshot.data?.forEach((element) {
                      //debugPrint(element.id.toString() + ' ' + element.collectionName.toString() + '   #' + element.description.toString());
                      collections.store.add(element);
                    });

                    /*Initialize active collection with first received collection if not initialized yet*/
                    if(activeCollection.store.collectionName == ''){
                      activeCollection.store = collections.store[0];
                    }

                    return DropdownButtonFormField(
                        value: activeCollection.store.collectionName,
                        decoration: const InputDecoration(
                          labelText: 'Chose Collection',
                        ),
                        items:
                        collections.store.map((Collection collection) {
                          return DropdownMenuItem(
                            value: collection.collectionName,
                            child: Text(collection.collectionName),
                          );
                        }).toList(),
                        onChanged: (value) {
                          activeCollection.store = collections.getCollectionFromName(value.toString());
                        }
                    );
                  }
                  else{
                    return const CircularProgressIndicator();
                  }
                }
            ),
          ],
        ),
      ),
      bottomNavigationBar: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          FloatingActionButton.extended(
            heroTag: null,
            tooltip: 'Request Collections from sensor.awi.de',
            icon: const Icon(Icons.download),
            label: const Text("Get Collections"),
            onPressed: () {
            },
          ),
          FloatingActionButton.extended(
            heroTag: null,
            tooltip: 'Select Collection and download corresponding devices',
            icon: const Icon(Icons.save),
            label: const Text('Select'),
            onPressed: () {
              updateDevices(activeCollection.store.id);
            },
          ),
        ],
      ),
    );
  }
}