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

import 'dart:async';

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/account.dart';
import 'package:nc_photos/app_localizations.dart';
import 'package:nc_photos/controller/account_controller.dart';
import 'package:nc_photos/controller/collections_controller.dart';
import 'package:nc_photos/entity/collection.dart';
import 'package:nc_photos/entity/collection/exporter.dart';
import 'package:nc_photos/entity/collection_item.dart';
import 'package:nc_photos/exception_event.dart';
import 'package:nc_photos/exception_util.dart' as exception_util;
import 'package:nc_photos/k.dart' as k;
import 'package:nc_photos/snack_bar_manager.dart';
import 'package:nc_photos/widget/processing_dialog.dart';
import 'package:np_codegen/np_codegen.dart';
import 'package:to_string/to_string.dart';

part 'export_collection_dialog.g.dart';
part 'export_collection_dialog/bloc.dart';
part 'export_collection_dialog/state_event.dart';

class ExportCollectionDialog extends StatelessWidget {
  const ExportCollectionDialog({
    super.key,
    required this.account,
    required this.collection,
    required this.items,
  });

  @override
  Widget build(BuildContext context) {
    return BlocProvider(
      create: (context) => _Bloc(
        account: account,
        collectionsController:
            context.read<AccountController>().collectionsController,
        collection: collection,
        items: items,
      ),
      child: const _WrappedExportCollectionDialog(),
    );
  }

  final Account account;
  final Collection collection;
  final List<CollectionItem> items;
}

class _WrappedExportCollectionDialog extends StatefulWidget {
  const _WrappedExportCollectionDialog();

  @override
  State<StatefulWidget> createState() => _WrappedExportCollectionDialogState();
}

@npLog
class _WrappedExportCollectionDialogState
    extends State<_WrappedExportCollectionDialog> {
  @override
  Widget build(BuildContext context) {
    return MultiBlocListener(
      listeners: [
        BlocListener<_Bloc, _State>(
          listenWhen: (previous, current) =>
              previous.result != current.result && current.result != null,
          listener: _onResult,
        ),
        BlocListener<_Bloc, _State>(
          listenWhen: (previous, current) => previous.error != current.error,
          listener: (_, state) {
            if (state.error != null) {
              SnackBarManager().showSnackBar(SnackBar(
                content: Text(exception_util.toUserString(state.error!.error)),
                duration: k.snackBarDurationNormal,
              ));
            }
          },
        ),
      ],
      child: BlocBuilder<_Bloc, _State>(
        buildWhen: (previous, current) =>
            previous.isExporting != current.isExporting,
        builder: (context, state) {
          if (state.isExporting) {
            return ProcessingDialog(
              text: L10n.global().genericProcessingDialogContent,
            );
          } else {
            return AlertDialog(
              title: Text(L10n.global().exportCollectionDialogTitle),
              content: Form(
                key: _formKey,
                child: Container(
                  constraints: const BoxConstraints.tightFor(width: 280),
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: const [
                      _NameTextField(),
                      _ProviderDropdown(),
                      SizedBox(height: 8),
                      _ProviderDescription(),
                    ],
                  ),
                ),
              ),
              actions: [
                TextButton(
                  onPressed: () => _onOkPressed(context),
                  child: Text(MaterialLocalizations.of(context).okButtonLabel),
                ),
              ],
            );
          }
        },
      ),
    );
  }

  Future<void> _onOkPressed(BuildContext context) async {
    if (_formKey.currentState?.validate() == true) {
      _bloc.add(const _SubmitForm());
    }
  }

  void _onResult(BuildContext context, _State state) {
    Navigator.of(context).pop(state.result);
  }

  late final _bloc = context.read<_Bloc>();

  final _formKey = GlobalKey<FormState>();
}

class _NameTextField extends StatelessWidget {
  const _NameTextField();

  @override
  Widget build(BuildContext context) {
    return TextFormField(
      decoration: InputDecoration(
        hintText: L10n.global().nameInputHint,
      ),
      initialValue: context.read<_Bloc>().state.formValue.name,
      validator: (value) {
        if (value!.isEmpty) {
          return L10n.global().nameInputInvalidEmpty;
        }
        return null;
      },
      onChanged: (value) {
        context.read<_Bloc>().add(_SubmitName(value));
      },
    );
  }
}

class _ProviderDropdown extends StatelessWidget {
  const _ProviderDropdown();

  @override
  Widget build(BuildContext context) {
    return BlocBuilder<_Bloc, _State>(
      buildWhen: (previous, current) =>
          previous.formValue.provider != current.formValue.provider,
      builder: (context, state) => DropdownButtonHideUnderline(
        child: DropdownButtonFormField<_ProviderOption>(
          value: state.formValue.provider,
          items: _ProviderOption.values
              .map((e) => DropdownMenuItem<_ProviderOption>(
                    value: e,
                    child: Text(e.toValueString(context)),
                  ))
              .toList(),
          onChanged: (value) {
            context.read<_Bloc>().add(_SubmitProvider(value!));
          },
        ),
      ),
    );
  }
}

class _ProviderDescription extends StatelessWidget {
  const _ProviderDescription();

  @override
  Widget build(BuildContext context) {
    return BlocBuilder<_Bloc, _State>(
      buildWhen: (previous, current) =>
          previous.formValue.provider != current.formValue.provider,
      builder: (context, state) => Text(
        state.formValue.provider.toDescription(context),
        style: Theme.of(context).textTheme.bodyText2,
      ),
    );
  }
}

enum _ProviderOption {
  appAlbum,
  ncAlbum;

  String toValueString(BuildContext context) {
    switch (this) {
      case appAlbum:
        return L10n.global().createCollectionDialogAlbumLabel;
      case ncAlbum:
        return "Nextcloud Album";
    }
  }

  String toDescription(BuildContext context) {
    switch (this) {
      case appAlbum:
        return L10n.global().createCollectionDialogAlbumDescription;
      case ncAlbum:
        return "Server-side album, require Nextcloud 25 or above";
    }
  }
}