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

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

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

// Project imports:
import 'package:invoiceninja_flutter/data/models/models.dart';
import 'package:invoiceninja_flutter/main_app.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/ui/ui_actions.dart';
import 'package:invoiceninja_flutter/ui/app/dialogs/error_dialog.dart';
import 'package:invoiceninja_flutter/ui/task/edit/task_edit.dart';
import 'package:invoiceninja_flutter/ui/task/view/task_view_vm.dart';
import 'package:invoiceninja_flutter/utils/completers.dart';

class TaskEditScreen extends StatelessWidget {
  const TaskEditScreen({Key key}) : super(key: key);
  static const String route = '/task/edit';

  @override
  Widget build(BuildContext context) {
    return StoreConnector<AppState, TaskEditVM>(
      converter: (Store<AppState> store) {
        return TaskEditVM.fromStore(store);
      },
      builder: (context, viewModel) {
        return TaskEdit(
          viewModel: viewModel,
          key: ValueKey(viewModel.task.updatedAt),
        );
      },
    );
  }
}

class TaskEditVM {
  TaskEditVM({
    @required this.state,
    @required this.task,
    @required this.onFabPressed,
    @required this.taskTimeIndex,
    @required this.company,
    @required this.isSaving,
    @required this.origTask,
    @required this.onSavePressed,
    @required this.onCancelPressed,
    @required this.isLoading,
  });

  factory TaskEditVM.fromStore(Store<AppState> store) {
    final task = store.state.taskUIState.editing;
    final state = store.state;

    return TaskEditVM(
      isLoading: state.isLoading,
      isSaving: state.isSaving,
      origTask: state.taskState.map[task.id],
      task: task,
      taskTimeIndex: state.taskUIState.editingTimeIndex,
      state: state,
      company: state.company,
      onCancelPressed: (BuildContext context) {
        createEntity(context: context, entity: TaskEntity(), force: true);
        store.dispatch(UpdateCurrentRoute(state.uiState.previousRoute));
      },
      onFabPressed: () {
        if (task.isRunning) {
          final taskTimes = task.getTaskTimes();
          store.dispatch(UpdateTaskTime(
              index: taskTimes.length - 1,
              taskTime: taskTimes.firstWhere((time) => time.isRunning).stop));
        } else {
          store.dispatch(AddTaskTime(TaskTime()));
        }
      },
      onSavePressed: (BuildContext context, [EntityAction action]) {
        Debouncer.runOnComplete(() {
          final task = store.state.taskUIState.editing;
          final origTask = state.taskState.get(task.id);
          final localization = navigatorKey.localization;
          final navigator = navigatorKey.currentState;
          if (!task.areTimesValid) {
            showDialog<ErrorDialog>(
                context: navigatorKey.currentContext,
                builder: (BuildContext context) {
                  return ErrorDialog(localization.taskErrors);
                });
            return null;
          }

          if (task.isOld &&
              task.isChanged == false &&
              action != null &&
              action.isClientSide) {
            handleEntityAction(task, action);
          } else {
            final Completer<TaskEntity> completer = new Completer<TaskEntity>();
            store.dispatch(SaveTaskRequest(
              completer: completer,
              task: task,
              action: action,
            ));
            return completer.future.then((savedTask) {
              showToast(task.isNew
                  ? localization.createdTask
                  : localization.updatedTask);

              if (origTask.statusId != savedTask.statusId) {
                store.dispatch(UpdateKanban());
              }

              if (state.prefState.isMobile) {
                store.dispatch(UpdateCurrentRoute(TaskViewScreen.route));
                if (task.isNew) {
                  navigator.pushReplacementNamed(TaskViewScreen.route);
                } else {
                  navigator.pop(savedTask);
                }
              } else {
                if (!state.prefState.isPreviewVisible) {
                  store.dispatch(TogglePreviewSidebar());
                }

                viewEntity(entity: savedTask);

                if (state.prefState.isEditorFullScreen(EntityType.task) &&
                    state.prefState.editAfterSaving) {
                  editEntity(entity: savedTask);
                }
              }

              if (action != null && action.isClientSide) {
                handleEntityAction(savedTask, action);
              } else if (action != null && action.requiresSecondRequest) {
                handleEntityAction(savedTask, action);
                viewEntity(entity: savedTask, force: true);
              }
            }).catchError((Object error) {
              showDialog<ErrorDialog>(
                  context: navigatorKey.currentContext,
                  builder: (BuildContext context) {
                    return ErrorDialog(error);
                  });
            });
          }
        });
      },
    );
  }

  final TaskEntity task;
  final int taskTimeIndex;
  final CompanyEntity company;
  final Function(BuildContext, [EntityAction]) onSavePressed;
  final Function(BuildContext) onCancelPressed;
  final Function onFabPressed;
  final bool isLoading;
  final bool isSaving;
  final TaskEntity origTask;
  final AppState state;
}