info_tren/lib/train_info_page/train_info_cupertino.dart

import 'package:flutter/cupertino.dart';
import 'package:info_tren/models/train_data.dart';
import 'package:info_tren/train_info_page/train_info.dart';
import 'package:info_tren/train_info_page/train_info_animation_helpers.dart';
import 'package:info_tren/train_info_page/train_info_constants.dart';
import 'package:info_tren/train_info_page/train_info_cupertino_DisplayTrainStation.dart';
import 'package:info_tren/utils/stream_list.dart';

class TrainInfoCupertino extends StatefulWidget {
  final int trainNumber;

  TrainInfoCupertino({@required this.trainNumber});

  @override
  _TrainInfoCupertinoState createState() => _TrainInfoCupertinoState();
}

class _TrainInfoCupertinoState extends State<TrainInfoCupertino> with TrainInfoMixin {
  @override
  void initState() {
    super.initState();

    title = widget.trainNumber.toString();
    showTrainData = false;
    requestedData = false;
  }

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();

    if (!requestedData) {
      requestedData = true;

      TrainDataWebViewAdapter.of(context).loadTrain(widget.trainNumber).then((value) {
        setState(() {
          lookupResult = value;
        });

        if (lookupResult == TrainLookupResult.NOT_FOUND) {
          Future.delayed(Duration(seconds: 5), () {
            Navigator.of(context).pop();
          });
        }
        else if (lookupResult == TrainLookupResult.FOUND) {
          Future.delayed(Duration(seconds: 1, milliseconds: 500), () {
            setState(() {
              showTrainData = true;
            });
          });
        }
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    if (!showTrainData) {
      return _TrainDataCupertinoBefore(
        title: title,
        lookupResult: lookupResult,
      );
    }
    else {
      return _TrainDataCupertinoAfter(
        title: title,
      );
    }
  }
}

class _TrainDataCupertinoBefore extends StatefulWidget {
  final String title;
  final TrainLookupResult lookupResult;

  _TrainDataCupertinoBefore({
    @required this.title,
    @required this.lookupResult,
  });

  @override
  __TrainDataCupertinoBeforeState createState() => __TrainDataCupertinoBeforeState();
}

class __TrainDataCupertinoBeforeState extends State<_TrainDataCupertinoBefore> {
  @override
  Widget build(BuildContext context) {
    return CupertinoPageScaffold(
      navigationBar: CupertinoNavigationBar(
        middle: Text(widget.title ?? ""),
      ),
      child: SafeArea(
        child: StreamBuilder<ProgressReport>(
          stream: TrainDataWebViewAdapter.of(context).progressStream,
          builder: (context, snapshot) {
            switch (snapshot.connectionState) {
              case ConnectionState.none:
                return Container();
              case ConnectionState.waiting:
                return Center(
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: <Widget>[
                      CupertinoActivityIndicator(),
                      Text(
                        "Conectare...", 
                        style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                          fontSize: 18,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                    ],
                  ),
                );
              case ConnectionState.active:
                break;
              case ConnectionState.done:
                Navigator.of(context).pop();
                return Container();
            }

            return Center(
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: <Widget>[
                  ProgressReportDisplayEntry(
                    key: ValueKey(1),
                    completed: 1 <= snapshot.data.current,
                    waitingText: "Se crează WebView",
                    completedText: "WebView a fost creat",
                  ),
                  ProgressReportDisplayEntry(
                    key: ValueKey(2),
                    completed: 2 <= snapshot.data.current,
                    waitingText: "Se încarcă pagina Informatica Feroviară",
                    completedText: "Pagina Informatica Feroviară a fost încărcată",
                  ),
                  ProgressReportDisplayEntry(
                    key: ValueKey(3),
                    completed: 3 <= snapshot.data.current,
                    waitingText: "Se încarcă informațiile despre tren",
                    completedText: "Informațiile despre tren au fost încărcate",
                  ),
                  if (widget.lookupResult != null)
                    ...[
                      Container(height: 20,),
                      SizedBox(
                        width: double.infinity,
                        child: AnimatedBackground(
                          animationDuration: Duration(milliseconds: 250),
                          initialColor: CupertinoTheme.of(context).scaffoldBackgroundColor,
                          backgroundColor: 
                          widget.lookupResult == TrainLookupResult.FOUND
                          ? BACKGROUND_GREEN
                          : BACKGROUND_RED,
                          child: Center(
                            child: Row(
                              children: <Widget>[
                                Expanded(child: Container(),),
                                if (widget.lookupResult == TrainLookupResult.FOUND)
                                  Padding(
                                    padding: const EdgeInsets.fromLTRB(8, 8, 0, 8),
                                    child: Center(
                                      child: CupertinoActivityIndicator()
                                    ),
                                  ),
                                Padding(
                                  padding: const EdgeInsets.all(8.0),
                                  child: Text(
                                    widget.lookupResult == TrainLookupResult.FOUND
                                    ? "Trenul a fost găsit"
                                    : widget.lookupResult == TrainLookupResult.NOT_FOUND
                                    ? "Trenul nu a fost găsit"
                                    : "A apărut o eroare în căutarea trenului",
                                    style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(fontSize: 20),
                                  ),
                                ),
                                Expanded(child: Container(),),
                              ],
                            ),
                          ),
                        ),
                      ),
                    ],
                ],
              ),
            );
          }
        ),
      ),
    );
  }
}

class _TrainDataCupertinoAfter extends StatefulWidget {
  final String title;

  _TrainDataCupertinoAfter({
    @required this.title,
  });

  @override
  __TrainDataCupertinoAfterState createState() => __TrainDataCupertinoAfterState();
}

class __TrainDataCupertinoAfterState extends State<_TrainDataCupertinoAfter> {
  @override
  Widget build(BuildContext context) {
    return FutureBuilder<OnDemandTrainData>(
      future: TrainDataWebViewAdapter.of(context).trainData(onInvalidation: () {
        Navigator.of(context).pop();
      }),
      builder: (context, snapshot) {
        if (!snapshot.hasData) {
          return CupertinoPageScaffold(
            navigationBar: CupertinoNavigationBar(
              middle: Text(widget.title ?? ""),
            ),
            child: SafeArea(
              child: Center(
                child: CupertinoActivityIndicator(),
              ),
            ),
          );
        }

        return CupertinoPageScaffold(
          navigationBar: CupertinoNavigationBar(
            middle: FutureBuilder<List<String>>(
              future: Future.wait([
                snapshot.data.rang,
                snapshot.data.trainNumber
              ]),
              builder: (context, snapshot) {
                if (snapshot.hasData) {
                  return Text("Informații despre ${snapshot.data[0]} ${snapshot.data[1]}");
                }
                else {
                  return Text(widget.title ?? "");
                }
              },
            ),
          ),
          child: SafeArea(
            top: false,
            bottom: false,
            child: Builder(
              builder: (context) {
                final topPadding = MediaQuery.of(context).padding.top;

                return CustomScrollView(
                  slivers: <Widget>[
                    SliverToBoxAdapter(
                      child: Padding(
                        padding: EdgeInsets.only(
                          top: topPadding,
                        ),
                        child: Container(),
                      ),
                    ),
                    DisplayTrainID(trainData: snapshot.data,),
                    DisplayTrainOperator(trainData: snapshot.data,),
                    DisplayTrainRoute(trainData: snapshot.data,),
                    DisplayTrainDeparture(trainData: snapshot.data,),
                    SliverToBoxAdapter(
                      child: CupertinoDivider(
                        color: FOREGROUND_WHITE,
                      ),
                    ),
                    DisplayTrainLastInfo(trainData: snapshot.data,),
                    SliverToBoxAdapter(
                      child: CupertinoDivider(),
                    ),
                    SliverToBoxAdapter(
                      child: IntrinsicHeight(
                        child: Row(
                          children: <Widget>[
                            Expanded(
                              child: DisplayTrainNextStop(trainData: snapshot.data,),
                            ),
                            SizedBox(
                              height: double.infinity,
                              child: CupertinoVerticalDivider(),
                            ),
                            Expanded(
                              child: DisplayTrainDestination(trainData: snapshot.data,),
                            )
                          ],
                        ),
                      ),
                    ),
                    SliverToBoxAdapter(
                      child: CupertinoDivider(),
                    ),
                    SliverToBoxAdapter(
                      child: IntrinsicHeight(
                        child: Row(
                          children: <Widget>[
                            Expanded(
                              child: DisplayTrainRouteDuration(trainData: snapshot.data,),
                            ),
                            SizedBox(
                              height: double.infinity,
                              child: CupertinoVerticalDivider(),
                            ),
                            Expanded(
                              child: DisplayTrainRouteDistance(trainData: snapshot.data,),
                            )
                          ],
                        ),
                      ),
                    ),
                    SliverToBoxAdapter(
                      child: CupertinoDivider(
                        color: FOREGROUND_WHITE,
                      ),
                    ),
                    DisplayTrainStations(
                      trainData: snapshot.data,
                      pageLoadFuture: TrainDataWebViewAdapter.of(context).nextLoadFuture,
                    ),
                    SliverToBoxAdapter(
                      child: Container(
                        height: MediaQuery.of(context).viewPadding.bottom,
                      ),
                    ),
                  ],
                );
              }
            ),
          ),
        );
      },
    );

    // return CupertinoPageScaffold(
    //   navigationBar: CupertinoNavigationBar(
    //     middle: Text(title ?? ""),
    //   ),
    //   child: SafeArea(
    //     bottom: false,
    //     child: FutureBuilder<OnDemandTrainData>(
    //       future: TrainDataWebViewAdapter.of(context).trainData(onInvalidation: () {
    //         Navigator.of(context).pop();
    //       }),
    //       builder: (context, snapshot) {
    //         if (!snapshot.hasData) {
    //           return Center(
    //             child: CupertinoActivityIndicator(),
    //           );
    //         }

    //         try {
    //           Future.wait([
    //             snapshot.data.rang,
    //             snapshot.data.trainNumber
    //           ]).then((values) {
    //             setState(() {
    //               title = "Informații despre ${values[0]} ${values[1]}";
    //             });
    //           });

    //           return CustomScrollView(
    //             slivers: <Widget>[
    //               DisplayTrainID(data: snapshot.data,),
    //               DisplayTrainOperator(data: snapshot.data,),
    //               DisplayTrainRoute(data: snapshot.data,),
    //               DisplayTrainDeparture(data: snapshot.data,),
    //               SliverToBoxAdapter(
    //                 child: CupertinoDivider(
    //                   color: FOREGROUND_WHITE,
    //                 ),
    //               ),
    //               DisplayTrainLastInfo(data: snapshot.data,),
    //               SliverToBoxAdapter(
    //                 child: CupertinoDivider(),
    //               ),
    //               SliverToBoxAdapter(
    //                 child: IntrinsicHeight(
    //                   child: Row(
    //                     children: <Widget>[
    //                       Expanded(
    //                         child: DisplayTrainNextStop(data: snapshot.data,),
    //                       ),
    //                       SizedBox(
    //                         height: double.infinity,
    //                         child: CupertinoVerticalDivider(),
    //                       ),
    //                       Expanded(
    //                         child: DisplayTrainDestination(data: snapshot.data,),
    //                       )
    //                     ],
    //                   ),
    //                 ),
    //               ),
    //               SliverToBoxAdapter(
    //                 child: CupertinoDivider(),
    //               ),
    //               SliverToBoxAdapter(
    //                 child: IntrinsicHeight(
    //                   child: Row(
    //                     children: <Widget>[
    //                       Expanded(
    //                         child: DisplayTrainRouteDuration(data: snapshot.data,),
    //                       ),
    //                       SizedBox(
    //                         height: double.infinity,
    //                         child: CupertinoVerticalDivider(),
    //                       ),
    //                       Expanded(
    //                         child: DisplayTrainRouteDistance(data: snapshot.data,),
    //                       )
    //                     ],
    //                   ),
    //                 ),
    //               ),
    //               SliverToBoxAdapter(
    //                 child: CupertinoDivider(
    //                   color: FOREGROUND_WHITE,
    //                 ),
    //               ),
    //               DisplayTrainStations(
    //                 data: snapshot.data,
    //                 pageLoadFuture: TrainDataWebViewAdapter.of(context).nextLoadFuture,
    //               ),
    //             ],
    //           );
    //         }
    //         on OnDemandInvalidatedException {
    //           Navigator.of(context).pop();
    //           print("Got OnDemandInvalidatedException!");
    //           return Container();
    //         }
    //       },
    //     ),
    //   ),
    // );
  }
}

class DisplayTrainID extends StatelessWidget {
  final OnDemandTrainData trainData;
  DisplayTrainID({@required this.trainData});

  @override
  Widget build(BuildContext context) {
    return SliverToBoxAdapter(
      child: FutureDisplay(
        future: Future.wait([
          trainData.rang,
          trainData.trainNumber
        ]),
        builder: (context, datas) {
          return Center(
            child: Padding(
              padding: const EdgeInsets.all(8.0),
              child: Text(
                "${datas[0]} ${datas[1]}",
                style: CupertinoTheme.of(context).textTheme.navLargeTitleTextStyle,
              ),
            ),
          );
        },
      ),
    );
  }
}

class DisplayTrainRoute extends StatelessWidget {
  final OnDemandTrainData trainData;

  DisplayTrainRoute({@required this.trainData});

  @override
  Widget build(BuildContext context) {
    return SliverToBoxAdapter(
      child: FutureDisplay(
        future: Future.wait([trainData.route.from, trainData.route.to]),
        builder: (context, routePieces) {
          return Row(
            children: <Widget>[
              Center(
                child: Padding(
                  padding: const EdgeInsets.all(4),
                  child: Text(
                    routePieces[0],
                    style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                      fontSize: 16,
                    ),
                  ),
                ),
              ),
              Expanded(child: Container(),),
              Center(child: Text("-")),
              Expanded(child: Container(),),
              Center(
                child: Padding(
                  padding: const EdgeInsets.all(4),
                  child: Text(
                    routePieces[1],
                    style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                      fontSize: 16,
                    ),
                    textAlign: TextAlign.right,
                  ),
                ),
              ),
            ],
          );
        },
      ),
    );
  }
}

class DisplayTrainOperator extends StatelessWidget {
  final OnDemandTrainData trainData;

  DisplayTrainOperator({@required this.trainData});

  @override
  Widget build(BuildContext context) {
    return SliverToBoxAdapter(
      child: FutureDisplay(
        future: trainData.operator,
        builder: (context, operator) {
          return Center(
            child: Text(
              operator,
              style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                fontSize: 14,
                fontStyle: FontStyle.italic,
              ),
            ),
          );
        },
      ),
    );
  }
}

class DisplayTrainDeparture extends StatelessWidget {
  final OnDemandTrainData trainData;

  DisplayTrainDeparture({@required this.trainData});

  @override
  Widget build(BuildContext context) {
    return SliverToBoxAdapter(
      child: Padding(
        padding: const EdgeInsets.all(2),
        child: FutureDisplay<DateTime>(
          future: trainData.departureDate,
          builder: (context, dataPlecare) {
            return Text(
              "Plecare în ${dataPlecare.day.toString().padLeft(2, '0')}.${dataPlecare.month.toString().padLeft(2, '0')}.${dataPlecare.year.toString().padLeft(4, '0')}",
              style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                fontStyle: FontStyle.italic,
                fontWeight: FontWeight.w200,
              ),
              textAlign: TextAlign.center,
            );
          },
        ),
      ),
    );
  }
}

class DisplayTrainLastInfo extends StatelessWidget {
  final OnDemandTrainData trainData;

  DisplayTrainLastInfo({@required this.trainData});

  @override
  Widget build(BuildContext context) {
    return SliverToBoxAdapter(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: <Widget>[
          Center(
            child: Padding(
              padding: const EdgeInsets.all(2),
              child: Text(
                "Ultima informație",
                style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                  fontSize: 20,
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
          ),
          Row(
            children: <Widget>[
              Padding(
                padding: const EdgeInsets.all(4),
                child: FutureDisplay(
                  future: trainData.lastInfo.station,
                  builder: (context, station) {
                    return Text(
                      station,
                      style: CupertinoTheme.of(context).textTheme.textStyle,
                      textAlign: TextAlign.left,
                    );
                  },
                ),
              ),
              Expanded(child: Container(),),
              Padding(
                padding: const EdgeInsets.all(4),
                child: FutureDisplay(
                  future: trainData.lastInfo.event,
                  builder: (context, event) {
                    return Text(
                      event,
                      style: CupertinoTheme.of(context).textTheme.textStyle,
                      textAlign: TextAlign.right,
                    );
                  },
                ),
              ),
            ],
          ),
          FutureDisplay<DateTime>(
            future: trainData.lastInfo.dateAndTime,
            builder: (context, dt) {
              return Text(
                "Raportat în ${dt.day.toString().padLeft(2, '0')}.${dt.month.toString().padLeft(2, '0')}.${dt.year.toString().padLeft(4, '0')}, la ${dt.hour.toString().padLeft(2, '0')}:${dt.minute.toString().padLeft(2, '0')}",
                textAlign: TextAlign.center,
              );
            },
          ),
          FutureBuilder(
            initialData: 0,
            future: trainData.lastInfo.delay,
            builder: (context, snapshot) {
              if (snapshot.data == 0) {
                return Container();
              }

              if (snapshot.data > 0) {
                return Text(
                  "${snapshot.data} minute întârziere",
                  style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                    fontSize: 14,
                    color: Color.fromRGBO(200, 30, 15, 1),
                  ),
                );
              }
              else {
                return Text(
                  "${-snapshot.data} minute mai devreme",
                  style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                    fontSize: 12,
                    color: Color.fromRGBO(15, 200, 15, 1),
                  ),
                );
              }
            },
          )
        ],
      ),
    );
  }
}

class DisplayTrainNextStop extends StatelessWidget {
  final OnDemandTrainData trainData;

  DisplayTrainNextStop({@required this.trainData});

  @override
  Widget build(BuildContext context) {
    return FutureBuilder(
      future: trainData.nextStop.stationName,
      builder: (context, snapshot) {
        if (!snapshot.hasData) return Container();
        
        return Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            Padding(
              padding: const EdgeInsets.all(4),
              child: Text(
                "Următoarea oprire",
                style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                  fontSize: 20,
                  fontWeight: FontWeight.bold,
                ),
                textAlign: TextAlign.center,
              ),
            ),
            CupertinoDivider(
              color: Color.fromRGBO(15, 15, 15, 1),
            ),
            FutureDisplay(
              future: trainData.nextStop.stationName,
              builder: (context, station) {
                return Padding(
                  padding: const EdgeInsets.fromLTRB(4, 0, 4, 0),
                  child: Text(
                    station,
                    style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                      fontSize: 18,
                      fontWeight: FontWeight.w500,
                    ),
                    textAlign: TextAlign.center,
                  ),
                );
              },
            ),
            FutureDisplay<DateTime>(
              future: trainData.nextStop.arrival,
              builder: (context, arrival) {
                const months = ["ian", "feb", "mar", "apr", "mai", "iun", "iul", "aug", "sep", "oct", "noi", "dec"];

                return Column(
                  mainAxisSize: MainAxisSize.min,
                  children: <Widget>[
                    Text(
                      "în ${arrival.day} ${months[arrival.month - 1]} ${arrival.year}",
                      style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                        fontSize: 14,
                      ),
                      textAlign: TextAlign.center,
                    ),
                    Text(
                      "la ${arrival.hour.toString().padLeft(2, '0')}:${arrival.minute.toString().padLeft(2, '0')}",
                      style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                        fontSize: 14,
                      ),
                      textAlign: TextAlign.center,
                    ),
                  ],
                );
              },
            )
          ],
        );
      }
    );
  }
}

class DisplayTrainDestination extends StatelessWidget {
  final OnDemandTrainData trainData;

  DisplayTrainDestination({@required this.trainData});

  @override
  Widget build(BuildContext context) {
    return FutureBuilder(
      future: trainData.destination.stationName,
      builder: (context, snapshot) {
        if (!snapshot.hasData) return Container();
        
        return Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            Padding(
              padding: const EdgeInsets.all(4),
              child: Text(
                "Destinația",
                style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                  fontSize: 20,
                  fontWeight: FontWeight.bold,
                ),
                textAlign: TextAlign.center,
              ),
            ),
            CupertinoDivider(
              color: Color.fromRGBO(15, 15, 15, 1),
            ),
            FutureDisplay(
              future: trainData.destination.stationName,
              builder: (context, station) {
                return Padding(
                  padding: const EdgeInsets.fromLTRB(4, 0, 4, 0),
                  child: Text(
                    station,
                    style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                      fontSize: 18,
                      fontWeight: FontWeight.w500,
                    ),
                    textAlign: TextAlign.center,
                  ),
                );
              },
            ),
            FutureDisplay<DateTime>(
              future: trainData.destination.arrival,
              builder: (context, arrival) {
                const months = ["ian", "feb", "mar", "apr", "mai", "iun", "iul", "aug", "sep", "oct", "noi", "dec"];

                return Column(
                  mainAxisSize: MainAxisSize.min,
                  children: <Widget>[
                    Text(
                      "în ${arrival.day} ${months[arrival.month - 1]} ${arrival.year}",
                      style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                        fontSize: 14,
                      ),
                      textAlign: TextAlign.center,
                    ),
                    Text(
                      "la ${arrival.hour.toString().padLeft(2, '0')}:${arrival.minute.toString().padLeft(2, '0')}",
                      style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                        fontSize: 14,
                      ),
                      textAlign: TextAlign.center,
                    ),
                  ],
                );
              },
            )
          ],
        );
      }
    );
  }
}

class DisplayTrainRouteDistance extends StatelessWidget {
  final OnDemandTrainData trainData;

  DisplayTrainRouteDistance({@required this.trainData});

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisSize: MainAxisSize.min,
      children: <Widget>[
        Text(
          "Distanța rutei",
          style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
          textAlign: TextAlign.center,
        ),
        FutureDisplay(
          future: trainData.routeDistance,
          builder: (context, distance) {
            return Text(
              "$distance km",
              style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                fontSize: 16,
              ),
              textAlign: TextAlign.center,
            );
          },
        ),
      ],
    );
  }
}

class DisplayTrainRouteDuration extends StatelessWidget {
  final OnDemandTrainData trainData;

  DisplayTrainRouteDuration({@required this.trainData});

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisSize: MainAxisSize.min,
      children: <Widget>[
        Text(
          "Durata rutei",
          style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
          textAlign: TextAlign.center,
        ),
        FutureDisplay<Duration>(
          future: trainData.routeDuration,
          builder: (context, duration) {
            var durationString = StringBuffer();

            bool firstWritten = false;

            if (duration.inDays > 0) {
              firstWritten = true;
              if (duration.inDays == 1) durationString.write("1 zi");
              else durationString.write("${duration.inDays} zile");
              duration -= Duration(days: duration.inDays);
            }

            if (duration.inHours > 0) {
              if (firstWritten) {
                durationString.write(", ");
              }
              firstWritten = true;
              if (duration.inHours == 1) durationString.write("1 oră");
              else durationString.write("${duration.inHours} ore");
              duration -= Duration(hours: duration.inHours);
            }

            if (duration.inMinutes > 0) {
              if (firstWritten) {
                durationString.write(", ");
              }
              firstWritten = true;
              if (duration.inMinutes == 1) durationString.write("1 minut");
              else durationString.write("${duration.inMinutes} minute");
              duration -= Duration(minutes: duration.inMinutes);
            }

            return Text(
              durationString.toString(),
              style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
                fontSize: 16,
              ),
              textAlign: TextAlign.center,
            );
          },
        ),
      ],
    );
  }
}

class DisplayTrainStations extends StatelessWidget {
  final OnDemandTrainData trainData;
  final Future pageLoadFuture;

  DisplayTrainStations({@required this.trainData, @required this.pageLoadFuture});

  @override
  Widget build(BuildContext context) {
    return StreamBuilder<List<OnDemandStation>>(
      stream: listifyStream(trainData.stations(pageLoadFuture: pageLoadFuture)),
      builder: (context, snapshot) {
        if (!snapshot.hasData) {
          return SliverToBoxAdapter(
            child: Container(),
          );
        }

        return SliverList(
          delegate: SliverChildBuilderDelegate(
            (context, index) {
              if (index.isOdd) {
                return CupertinoDivider();
              }
              else {
                final itemIndex = index ~/ 2;
                return IndexedSemantics(
                  child: DisplayTrainStation(
                    station: snapshot.data[itemIndex],
                  ),
                  index: itemIndex,
                );
              }
            },
            childCount: snapshot.data.length * 2 - 1,
            addSemanticIndexes: false,
          ),
        );
      },
    );
  }
}

class CupertinoDivider extends StatelessWidget {
  final Color color;

  CupertinoDivider({Key key, Color color}):
  color = color ?? FOREGROUND_DARK_GREY,
  super(key: key);

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisSize: MainAxisSize.min,
      children: <Widget>[
        Container(
          height: 1,
        ),
        Container(
          height: 1,
          decoration: BoxDecoration(
            color: color,
          ),
        ),
        Container(
          height: 1,
        ),
      ],
    );
  }
}

class CupertinoVerticalDivider extends StatelessWidget {
  final Color color;

  CupertinoVerticalDivider({Key key, Color color}):
  color = color ?? FOREGROUND_DARK_GREY,
  super(key: key);

  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisSize: MainAxisSize.min,
      children: <Widget>[
        Container(
          width: 1,
        ),
        Container(
          width: 1,
          decoration: BoxDecoration(
            color: color,
          ),
        ),
        Container(
          width: 1,
        ),
      ],
    );
  }
}