paperless-mobile/lib/features/inbox/view/pages/inbox_page.dart

import 'package:collection/collection.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:intl/intl.dart';
import 'package:paperless_api/paperless_api.dart';
import 'package:paperless_mobile/features/app_drawer/view/app_drawer.dart';
import 'package:paperless_mobile/features/document_search/view/document_search_page.dart';
import 'package:paperless_mobile/features/documents/view/widgets/documents_list_loading_widget.dart';
import 'package:paperless_mobile/core/widgets/hint_card.dart';
import 'package:paperless_mobile/extensions/dart_extensions.dart';
import 'package:paperless_mobile/extensions/flutter_extensions.dart';
import 'package:paperless_mobile/features/inbox/bloc/inbox_cubit.dart';
import 'package:paperless_mobile/features/inbox/bloc/state/inbox_state.dart';
import 'package:paperless_mobile/features/inbox/view/widgets/inbox_empty_widget.dart';
import 'package:paperless_mobile/features/inbox/view/widgets/inbox_item.dart';
import 'package:paperless_mobile/features/search_app_bar/view/search_app_bar.dart';
import 'package:paperless_mobile/generated/l10n.dart';
import 'package:paperless_mobile/helpers/message_helpers.dart';

class InboxPage extends StatefulWidget {
  const InboxPage({super.key});

  @override
  State<InboxPage> createState() => _InboxPageState();
}

class _InboxPageState extends State<InboxPage> {
  final ScrollController _scrollController = ScrollController();
  final _emptyStateRefreshIndicatorKey = GlobalKey<RefreshIndicatorState>();

  @override
  void initState() {
    super.initState();
    context.read<InboxCubit>().initializeInbox();
    _scrollController.addListener(_listenForLoadNewData);
  }

  @override
  void dispose() {
    _scrollController.removeListener(_listenForLoadNewData);
    super.dispose();
  }

  void _listenForLoadNewData() {
    final currState = context.read<InboxCubit>().state;
    if (_scrollController.offset >=
            _scrollController.position.maxScrollExtent * 0.75 &&
        !currState.isLoading &&
        !currState.isLastPageLoaded) {
      try {
        context.read<InboxCubit>().loadMore();
      } on PaperlessServerException catch (error, stackTrace) {
        showErrorMessage(context, error, stackTrace);
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      drawer: const AppDrawer(),
      floatingActionButton: BlocBuilder<InboxCubit, InboxState>(
        builder: (context, state) {
          if (!state.hasLoaded || state.documents.isEmpty) {
            return const SizedBox.shrink();
          }
          return FloatingActionButton.extended(
            label: Text(S.of(context).inboxPageMarkAllAsSeenLabel),
            icon: const Icon(Icons.done_all),
            onPressed: state.hasLoaded && state.documents.isNotEmpty
                ? () => _onMarkAllAsSeen(
                      state.documents,
                      state.inboxTags,
                    )
                : null,
          );
        },
      ),
      body: RefreshIndicator(
        edgeOffset: 78,
        onRefresh: () => context.read<InboxCubit>().initializeInbox(),
        child: NestedScrollView(
          headerSliverBuilder: (context, innerBoxIsScrolled) => [
            SearchAppBar(
              hintText: S.of(context).documentSearchSearchDocuments,
              onOpenSearch: showDocumentSearchPage,
            ),
          ],
          body: BlocBuilder<InboxCubit, InboxState>(
            builder: (context, state) {
              if (!state.hasLoaded) {
                return const CustomScrollView(
                  physics: NeverScrollableScrollPhysics(),
                  slivers: [DocumentsListLoadingWidget()],
                );
              }

              if (state.documents.isEmpty) {
                return InboxEmptyWidget(
                  emptyStateRefreshIndicatorKey: _emptyStateRefreshIndicatorKey,
                );
              }

              // Build a list of slivers alternating between SliverToBoxAdapter
              // (group header) and a SliverList (inbox items).
              final List<Widget> slivers = _groupByDate(state.documents)
                  .entries
                  .map(
                    (entry) => [
                      SliverToBoxAdapter(
                        child: Align(
                          alignment: Alignment.centerLeft,
                          child: ClipRRect(
                            borderRadius: BorderRadius.circular(32.0),
                            child: Text(
                              entry.key,
                              style: Theme.of(context).textTheme.bodySmall,
                              textAlign: TextAlign.center,
                            ).padded(),
                          ),
                        ).paddedOnly(top: 8.0),
                      ),
                      SliverList(
                        delegate: SliverChildBuilderDelegate(
                          childCount: entry.value.length,
                          (context, index) {
                            if (index < entry.value.length - 1) {
                              return Column(
                                children: [
                                  _buildListItem(
                                    entry.value[index],
                                  ),
                                  const Divider(
                                    indent: 16,
                                    endIndent: 16,
                                  ),
                                ],
                              );
                            }
                            return _buildListItem(
                              entry.value[index],
                            );
                          },
                        ),
                      ),
                    ],
                  )
                  .flattened
                  .toList()
                ..add(const SliverToBoxAdapter(child: SizedBox(height: 78)));
              //                              edgeOffset: kToolbarHeight,

              return CustomScrollView(
                controller: _scrollController,
                slivers: [
                  SliverToBoxAdapter(
                    child: HintCard(
                      show: !state.isHintAcknowledged,
                      hintText: S.of(context).inboxPageUsageHintText,
                      onHintAcknowledged: () =>
                          context.read<InboxCubit>().acknowledgeHint(),
                    ),
                  ),
                  ...slivers,
                ],
              );
            },
          ),
        ),
      ),
    );
  }

  Widget _buildListItem(DocumentModel doc) {
    return Dismissible(
      direction: DismissDirection.endToStart,
      background: Row(
        mainAxisAlignment: MainAxisAlignment.end,
        children: [
          Icon(
            Icons.done_all,
            color: Theme.of(context).colorScheme.primary,
          ).padded(),
          Text(
            S.of(context).inboxPageMarkAsSeenText,
            style: TextStyle(
              color: Theme.of(context).colorScheme.primary,
            ),
          ),
        ],
      ).padded(),
      confirmDismiss: (_) => _onItemDismissed(doc),
      key: UniqueKey(),
      child: InboxItem(
        document: doc,
        onDocumentUpdated: (document) {
          context.read<InboxCubit>().replaceUpdatedDocument(document);
        },
      ),
    );
  }

  Future<void> _onMarkAllAsSeen(
    Iterable<DocumentModel> documents,
    Iterable<int> inboxTags,
  ) async {
    final isActionConfirmed = await showDialog(
          context: context,
          builder: (context) => AlertDialog(
            title: Text(S
                .of(context)
                .inboxPageMarkAllAsSeenConfirmationDialogTitleText),
            content: Text(
              S.of(context).inboxPageMarkAllAsSeenConfirmationDialogText,
            ),
            actions: [
              TextButton(
                onPressed: () => Navigator.of(context).pop(false),
                child: Text(S.of(context).genericActionCancelLabel),
              ),
              TextButton(
                onPressed: () => Navigator.of(context).pop(true),
                child: Text(
                  S.of(context).genericActionOkLabel,
                  style: TextStyle(color: Theme.of(context).colorScheme.error),
                ),
              ),
            ],
          ),
        ) ??
        false;
    if (isActionConfirmed) {
      await context.read<InboxCubit>().clearInbox();
    }
  }

  Future<bool> _onItemDismissed(DocumentModel doc) async {
    try {
      final removedTags = await context.read<InboxCubit>().removeFromInbox(doc);
      showSnackBar(
        context,
        S.of(context).inboxPageDocumentRemovedMessageText,
        action: SnackBarActionConfig(
          label: S.of(context).inboxPageUndoRemoveText,
          onPressed: () => _onUndoMarkAsSeen(doc, removedTags),
        ),
      );
      return true;
    } on PaperlessServerException catch (error, stackTrace) {
      showErrorMessage(context, error, stackTrace);
      return false;
    } catch (error) {
      showErrorMessage(
        context,
        const PaperlessServerException.unknown(),
      );
      return false;
    }
  }

  Future<void> _onUndoMarkAsSeen(
    DocumentModel document,
    Iterable<int> removedTags,
  ) async {
    try {
      await context
          .read<InboxCubit>()
          .undoRemoveFromInbox(document, removedTags);
    } on PaperlessServerException catch (error, stackTrace) {
      showErrorMessage(context, error, stackTrace);
    }
  }

  Map<String, List<DocumentModel>> _groupByDate(
    Iterable<DocumentModel> documents,
  ) {
    return groupBy<DocumentModel, String>(
      documents,
      (doc) {
        if (doc.added.isToday) {
          return S.of(context).inboxPageTodayText;
        }
        if (doc.added.isYesterday) {
          return S.of(context).inboxPageYesterdayText;
        }
        return DateFormat.yMMMMd().format(doc.added);
      },
    );
  }
}