nc-photos/app/lib/widget/place_picker/place_picker.dart

import 'package:copy_with/copy_with.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:logging/logging.dart';
import 'package:nc_photos/app_localizations.dart';
import 'package:nc_photos/bloc_util.dart';
import 'package:nc_photos/controller/pref_controller.dart';
import 'package:nc_photos/stream_util.dart';
import 'package:np_codegen/np_codegen.dart';
import 'package:np_gps_map/np_gps_map.dart';
import 'package:to_string/to_string.dart';

part 'bloc.dart';
part 'place_picker.g.dart';
part 'state_event.dart';

class PlacePickerArguments {
  const PlacePickerArguments({
    this.initialPosition,
    this.initialZoom,
  });

  final MapCoord? initialPosition;
  final double? initialZoom;
}

class PlacePicker extends StatelessWidget {
  static const routeName = "/place-picker";

  static Route buildRoute(PlacePickerArguments? args, RouteSettings settings) =>
      MaterialPageRoute<CameraPosition>(
        builder: (_) => PlacePicker.fromArgs(args),
        settings: settings,
      );

  const PlacePicker({
    super.key,
    required this.initialPosition,
    required this.initialZoom,
  });

  PlacePicker.fromArgs(
    PlacePickerArguments? args, {
    Key? key,
  }) : this(
          key: key,
          initialPosition: args?.initialPosition,
          initialZoom: args?.initialZoom,
        );

  @override
  Widget build(BuildContext context) {
    return BlocProvider(
      create: (context) => _Bloc(
        prefController: context.read(),
        initialPosition: initialPosition,
        initialZoom: initialZoom,
      ),
      child: const _WrappedPlacePicker(),
    );
  }

  final MapCoord? initialPosition;
  final double? initialZoom;
}

@npLog
class _WrappedPlacePicker extends StatelessWidget {
  const _WrappedPlacePicker();

  @override
  Widget build(BuildContext context) {
    return MultiBlocListener(
      listeners: [
        _BlocListenerT(
          selector: (state) => state.isDone,
          listener: (context, isDone) {
            if (isDone) {
              final position = context.state.position;
              _log.info("[build] Position picked: $position");
              Navigator.of(context).pop(position);
            }
          },
        ),
      ],
      child: Scaffold(
        appBar: AppBar(
          title: Text(L10n.global().placePickerTitle),
          leading: IconButton(
            onPressed: () {
              context.addEvent(const _Done());
            },
            icon: const Icon(Icons.check_outlined),
          ),
        ),
        body: const _BodyView(),
      ),
    );
  }
}

class _BodyView extends StatelessWidget {
  const _BodyView();

  @override
  Widget build(BuildContext context) {
    final position = context.bloc.initialPosition ??
        context.bloc.prefController.mapBrowserPrevPositionValue;
    return ValueStreamBuilderEx<GpsMapProvider>(
      stream: context.read<PrefController>().gpsMapProvider,
      builder: StreamWidgetBuilder.value(
        (context, gpsMapProvider) => PlacePickerView(
          providerHint: gpsMapProvider,
          initialPosition: position ?? const MapCoord(0, 0),
          initialZoom:
              context.bloc.initialZoom ?? (position == null ? 2.5 : 10),
          onCameraMove: (position) {
            context.addEvent(_SetPosition(position));
          },
        ),
      ),
    );
  }
}

// typedef _BlocBuilder = BlocBuilder<_Bloc, _State>;
// typedef _BlocListener = BlocListener<_Bloc, _State>;
typedef _BlocListenerT<T> = BlocListenerT<_Bloc, _State, T>;
// typedef _BlocSelector<T> = BlocSelector<_Bloc, _State, T>;
typedef _Emitter = Emitter<_State>;

extension on BuildContext {
  _Bloc get bloc => read<_Bloc>();
  _State get state => bloc.state;
  void addEvent(_Event event) => bloc.add(event);
}