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/entity/album.dart';
import 'package:nc_photos/entity/album/cover_provider.dart';
import 'package:nc_photos/entity/album/provider.dart';
import 'package:nc_photos/entity/album/sort_provider.dart';
import 'package:nc_photos/entity/collection.dart';
import 'package:nc_photos/entity/collection/content_provider/album.dart';
import 'package:nc_photos/entity/collection/content_provider/nc_album.dart';
import 'package:nc_photos/entity/file.dart';
import 'package:nc_photos/entity/nc_album.dart';
import 'package:nc_photos/entity/tag.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/album_dir_picker.dart';
import 'package:nc_photos/widget/processing_dialog.dart';
import 'package:nc_photos/widget/tag_picker_dialog.dart';
import 'package:np_codegen/np_codegen.dart';
import 'package:to_string/to_string.dart';

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

/// Dialog to create a new collection
///
/// Return the created collection, or null if user cancelled
class NewCollectionDialog extends StatelessWidget {
  const NewCollectionDialog({
    super.key,
    required this.account,
    this.isAllowDynamic = true,
  });

  @override
  Widget build(BuildContext context) {
    return BlocProvider(
      create: (context) => _Bloc(
        account: account,
        supportedProviders: {
          _ProviderOption.appAlbum,
          _ProviderOption.ncAlbum,
          if (isAllowDynamic) ...{
            _ProviderOption.dir,
            _ProviderOption.tag,
          },
        },
      ),
      child: const _WrappedNewCollectionDialog(),
    );
  }

  final Account account;
  final bool isAllowDynamic;
}

class _WrappedNewCollectionDialog extends StatefulWidget {
  const _WrappedNewCollectionDialog();

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

@npLog
class _WrappedNewCollectionDialogState
    extends State<_WrappedNewCollectionDialog> {
  @override
  Widget build(BuildContext context) {
    return MultiBlocListener(
      listeners: [
        BlocListener<_Bloc, _State>(
          listenWhen: (previous, current) =>
              previous.result != current.result && current.result != null,
          listener: _onResult,
        ),
      ],
      child: BlocBuilder<_Bloc, _State>(
        buildWhen: (previous, current) =>
            previous.result != current.result ||
            previous.showDialog != current.showDialog,
        builder: (context, state) => Visibility(
          visible: state.result == null && state.showDialog,
          child: AlertDialog(
            title: Text(L10n.global().createCollectionTooltip),
            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) {
      if (_bloc.state.formValue.provider == _ProviderOption.dir) {
        _bloc.add(const _HideDialog());
        final dirs = await Navigator.of(context).pushNamed<List<File>>(
          AlbumDirPicker.routeName,
          arguments: AlbumDirPickerArguments(_bloc.account),
        );
        if (dirs == null) {
          Navigator.of(context).pop();
          return;
        }
        _bloc
          ..add(_SubmitDirs(dirs))
          ..add(const _SubmitForm());
      } else if (_bloc.state.formValue.provider == _ProviderOption.tag) {
        _bloc.add(const _HideDialog());
        final tags = await showDialog<List<Tag>>(
          context: context,
          builder: (_) => TagPickerDialog(account: _bloc.account),
        );
        if (tags == null || tags.isEmpty) {
          Navigator.of(context).pop();
          return;
        }
        _bloc
          ..add(_SubmitTags(tags))
          ..add(const _SubmitForm());
      } else {
        _bloc.add(const _SubmitForm());
      }
    }
  }

  Future<void> _onResult(BuildContext context, _State state) async {
    unawaited(showDialog(
      barrierDismissible: false,
      context: context,
      builder: (_) =>
          ProcessingDialog(text: L10n.global().genericProcessingDialogContent),
    ));
    try {
      final collection = await context
          .read<AccountController>()
          .collectionsController
          .createNew(state.result!);
      Navigator.of(context)
        ..pop()
        ..pop(collection);
    } catch (e, stackTrace) {
      _log.shout("[_onResult] Failed", e, stackTrace);
      SnackBarManager().showSnackBar(SnackBar(
        content: Text(exception_util.toUserString(e)),
        duration: k.snackBarDurationNormal,
      ));
      Navigator.of(context).pop();
    }
  }

  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,
      ),
      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: state.supportedProviders
              .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,
  dir,
  tag,
  ncAlbum;

  String toValueString(BuildContext context) {
    switch (this) {
      case appAlbum:
        return L10n.global().createCollectionDialogAlbumLabel;
      case dir:
        return L10n.global().createCollectionDialogFolderLabel;
      case tag:
        return L10n.global().createCollectionDialogTagLabel;
      case ncAlbum:
        return L10n.global().createCollectionDialogNextcloudAlbumLabel;
    }
  }

  String toDescription(BuildContext context) {
    switch (this) {
      case appAlbum:
        return L10n.global().createCollectionDialogAlbumDescription;
      case dir:
        return L10n.global().createCollectionDialogFolderDescription;
      case tag:
        return L10n.global().createCollectionDialogTagDescription;
      case ncAlbum:
        return L10n.global().createCollectionDialogNextcloudAlbumDescription;
    }
  }
}