// Dart imports:
import 'dart:async';

// Flutter imports:
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';

// Package imports:
import 'package:built_collection/built_collection.dart';
import 'package:flutter_redux/flutter_redux.dart';
import 'package:redux/redux.dart';

// Project imports:
import 'package:invoiceninja_flutter/data/models/models.dart';
import 'package:invoiceninja_flutter/redux/app/app_actions.dart';
import 'package:invoiceninja_flutter/redux/app/app_state.dart';
import 'package:invoiceninja_flutter/redux/task/task_actions.dart';
import 'package:invoiceninja_flutter/redux/task/task_selectors.dart';
import 'package:invoiceninja_flutter/redux/ui/list_ui_state.dart';
import 'package:invoiceninja_flutter/ui/app/tables/entity_list.dart';
import 'package:invoiceninja_flutter/ui/task/task_list_item.dart';
import 'package:invoiceninja_flutter/ui/task/task_presenter.dart';
import 'package:invoiceninja_flutter/utils/completers.dart';
import 'package:invoiceninja_flutter/utils/localization.dart';

class TaskListBuilder extends StatelessWidget {
  const TaskListBuilder({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return StoreConnector<AppState, TaskListVM>(
      converter: TaskListVM.fromStore,
      builder: (context, viewModel) {
        return EntityList(
            onClearMultiselect: viewModel.onClearMultielsect,
            entityType: EntityType.task,
            presenter: TaskPresenter(),
            state: viewModel.state,
            entityList: viewModel.taskList,
            tableColumns: viewModel.tableColumns,
            onRefreshed: viewModel.onRefreshed,
            onSortColumn: viewModel.onSortColumn,
            itemBuilder: (BuildContext context, index) {
              final taskId = viewModel.taskList[index];
              final task = viewModel.taskMap[taskId];

              return TaskListItem(
                filter: viewModel.filter,
                task: task,
              );
            });
      },
    );
  }
}

class TaskListVM {
  TaskListVM({
    required this.state,
    required this.user,
    required this.taskList,
    required this.taskMap,
    required this.clientMap,
    required this.filter,
    required this.isLoading,
    required this.listState,
    required this.onRefreshed,
    required this.tableColumns,
    required this.onSortColumn,
    required this.onClearMultielsect,
  });

  static TaskListVM fromStore(Store<AppState> store) {
    Future<Null> _handleRefresh(BuildContext context) {
      if (store.state.isLoading) {
        return Future<Null>.value();
      }
      final completer = snackBarCompleter<Null>(
          context, AppLocalization.of(context)!.refreshComplete);
      store.dispatch(RefreshData(completer: completer));
      return completer.future;
    }

    final state = store.state;

    return TaskListVM(
      state: state,
      user: state.user,
      listState: state.taskListState,
      taskList: memoizedFilteredTaskList(
          state.getUISelection(EntityType.task),
          state.taskState.map,
          state.clientState.map,
          state.userState.map,
          state.projectState.map,
          state.invoiceState.map,
          state.taskStatusState.map,
          state.taskState.list,
          state.taskListState),
      taskMap: state.taskState.map,
      clientMap: state.clientState.map,
      isLoading: state.isLoading,
      filter: state.taskUIState.listUIState.filter,
      onSortColumn: (field) => store.dispatch(SortTasks(field)),
      onRefreshed: (context) => _handleRefresh(context),
      tableColumns:
          state.userCompany.settings.getTableColumns(EntityType.task) ??
              TaskPresenter.getDefaultTableFields(state.userCompany),
      onClearMultielsect: () => store.dispatch(ClearTaskMultiselect()),
    );
  }

  final AppState state;
  final UserEntity? user;
  final List<String> taskList;
  final BuiltMap<String, TaskEntity> taskMap;
  final BuiltMap<String, ClientEntity> clientMap;
  final ListUIState listState;
  final String? filter;
  final bool isLoading;
  final Function(BuildContext) onRefreshed;
  final List<String> tableColumns;
  final Function(String) onSortColumn;
  final Function onClearMultielsect;
}