import 'dart:convert';
import 'main.dart';

import 'package:flutter/cupertino.dart';
import 'package:http/http.dart' as http;
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'Timetable.dart';
import 'Login.dart';

Future<String> getToken(
    String user, String password, String otp, String devId) async {
  var uri = Uri.http("localhost:3000", "/login");
  String body =
      '{"user":"$user", "password": "$password", "otp": "$otp", "devid": "$devId"}';
  print(uri);
  final response = await http.post(uri, body: body);

  if (response.statusCode == 200) {
    return jsonDecode(utf8.decode(response.bodyBytes))['token'];
  } else if(response.statusCode == 401) {
    var body = response.body;
    Fluttertoast.showToast(
        msg: "Fehler: $body",
        toastLength: Toast.LENGTH_SHORT,
        gravity: ToastGravity.CENTER,
        timeInSecForIosWeb: 1,
        backgroundColor: Colors.red,
        textColor: Colors.white,
        fontSize: 16.0
    );
    throw Exception('Failed to log in');
  } else {
    throw Exception('Undefined error');
  }
}

Future<String> getUserInfo(
    String user, String password, String otp, String devId) async {
  var uri = Uri.http("localhost:3000", "/api/userinfo");
  String body =
      '{"user":"$user", "password": "$password", "otp": "$otp", "devid": "$devId"}';
  print(uri);
  final response = await http.post(uri, body: body);

  if (response.statusCode == 200) {
    return utf8.decode(response.bodyBytes);
  } else {
    throw Exception('Failed to log in');
  }
}

Future<http.Response> fetchClassTimetable() async {
  SharedPreferences prefs = await SharedPreferences.getInstance();
  var class_num;
  print(prefs.getString('class_num'));
  if (prefs.getString('class_num') != null) {
    class_num = prefs.getString('class_num')!;
  } else {
    class_num = '07_1';
  }
  var api_key = prefs.getString('api_key');
  var uri = Uri.https("mein.cantorgymnasium.de", "/api/timetable/$class_num");
  var headers = {"x-api-key": "$api_key"};
  print(uri);
  final response = http.get(uri, headers: headers);
  return response;
}

Widget buildClassTimetable() {
  return FutureBuilder<http.Response>(
    future: fetchClassTimetable(),
    builder: (context, snapshot) {
      if (snapshot.hasData) {
        int statusCode = snapshot.data!.statusCode;
        if (statusCode == 200) {
          ListView timetableView = ClassTimetableBuilder.buildView(
                  jsonDecode(utf8.decode(snapshot.data!.bodyBytes)))
              .view;
          return timetableView;
        }
        else if(statusCode == 400) {
          Navigator.push(context, MaterialPageRoute(builder: (context) => Login()));
        }
        return Center(child: Text('Error $statusCode'));
      } else if (snapshot.hasError) {
        return Text('$snapshot.error');
      } else {
        return Center(child: CircularProgressIndicator());
      }
    },
  );
}

Future<http.Response> fetchClassesList() async {
  SharedPreferences prefs = await SharedPreferences.getInstance();
  /*
  var class_num;
  print(prefs.getString('class_num'));
  if(prefs.getString('class_num') != null){
    class_num = prefs.getString('class_num')!;
  } else {
    class_num = '07_1';
  }
   */
  // await prefs.setString('api_key', "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJHZW9yZy1DYW50b3ItR3ltbmFzaXVtIEhhbGxlKFNhYWxlKSIsInVzZXIiOiJkZW55cy5rb25vdmFsb3ZAcG0ubWUiLCJyb2xlcyI6WyJTdHVkZW50IiwiQWRtaW4iXSwiYmxhY2tsaXN0IjpbIi9jbGFzc2VzIl0sIndoaXRlbGlzdCI6WyIvaGVsbG8vc2Vuc2l0aXZlIl0sImppZCI6IkFwcERldiBBbHBoYSBkdW1teSBrZXlAMDIvMDgvMjAyMSAxOTowODowOSIsImV4cCI6MTY1OTQ2NzI4OX0.a7Q83PK3ybeV7Bui-_rX1o6IZx1cNa6vsvUGG-kfqtc");
  var api_key = prefs.getString('api_key');
  var uri = Uri.https("mein.cantorgymnasium.de", "/api/classes");
  var headers = {"x-api-key": "$api_key"};
  print(uri);
  final response = http.get(uri, headers: headers);
  return response;
}

Widget buildClassesChooser() {
  return FutureBuilder<http.Response>(
    future: fetchClassesList(),
    builder: (context, snapshot) {
      if (snapshot.hasData) {
        int statusCode = snapshot.data!.statusCode;
        if (statusCode == 200) {
          // List<Widget> children = [];
          //ClassTimetable.fromJson(jsonDecode(utf8.decode(snapshot.data!.bodyBytes))).timetable.forEach((element) {
          //});
          List<String> items = [];
          jsonDecode(utf8.decode(snapshot.data!.bodyBytes)).forEach((value) {
            items.add(value..toString());
          });
          return ClassesChooser(items: items);
        }
        return Text('$statusCode');
      } else if (snapshot.hasError) {
        return Text('$snapshot.error');
      } else {
        return Center(child: CircularProgressIndicator());
      }
    },
  );
}

class ClassesChooser extends StatefulWidget {
  final List<String> items;
  const ClassesChooser({Key? key, required this.items}) : super(key: key);

  @override
  State<ClassesChooser> createState() => _ClassesChooserState(items);
}

class _ClassesChooserState extends State<ClassesChooser> {
  final List<String> items;
  //final String dropdownValue;
  var dropdownValue;
  _ClassesChooserState(this.items);

  @override
  Widget build(BuildContext context) {
    // var dropdown_items =
    return DropdownButtonFormField<String>(
      // value: dropdownValue,
      /*icon: const Icon(Icons.arrow_downward),
      iconSize: 24,
      elevation: 16,*/
      // style: const TextStyle(color: Color(0xFFFFBC3B)),
      /*underline: Container(
        height: 2,
        color: Color(0xFFFFBC3B),
      )
       */
      decoration: InputDecoration(
        icon: Icon(CupertinoIcons.number),
        border: OutlineInputBorder(),
        labelText: 'Klasse (05_1, 07_3, 10_2...)',
      ),
      // icon: Icon(CupertinoIcons.number),

      onChanged: (String? newValue) {
        setState(() async {
          dropdownValue = newValue!;
          SharedPreferences prefs = await SharedPreferences.getInstance();
          String class_num = newValue;
          print('Set new class to $class_num');
          await prefs.setString('class_num', class_num);
        });
      },
      items: items.map<DropdownMenuItem<String>>((String value) {
        return DropdownMenuItem<String>(
          value: value,
          child: Text(value),
        );
      }).toList(),
    );
  }
}