import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:invoiceninja_flutter/data/models/models.dart';
import 'package:invoiceninja_flutter/ui/app/entity_dropdown.dart';
import 'package:invoiceninja_flutter/ui/app/form_card.dart';
import 'package:invoiceninja_flutter/ui/app/forms/custom_field.dart';
import 'package:invoiceninja_flutter/ui/task/edit/task_edit_vm.dart';
import 'package:invoiceninja_flutter/ui/app/buttons/refresh_icon_button.dart';
import 'package:invoiceninja_flutter/utils/localization.dart';
import 'package:invoiceninja_flutter/redux/client/client_selectors.dart';
import 'package:invoiceninja_flutter/redux/project/project_selectors.dart';

class TaskEdit extends StatefulWidget {
  const TaskEdit({
    Key key,
    @required this.viewModel,
  }) : super(key: key);

  final TaskEditVM viewModel;

  @override
  _TaskEditState createState() => _TaskEditState();
}

class _TaskEditState extends State<TaskEdit> {
  static final GlobalKey<FormState> _formKey = GlobalKey<FormState>();

  final _descriptionController = TextEditingController();
  final _custom1Controller = TextEditingController();
  final _custom2Controller = TextEditingController();

  List<TextEditingController> _controllers = [];

  @override
  void didChangeDependencies() {
    _controllers = [
      _descriptionController,
      _custom1Controller,
      _custom2Controller,
    ];

    _controllers.forEach((controller) => controller.removeListener(_onChanged));

    final task = widget.viewModel.task;
    _descriptionController.text = task.description;
    _custom1Controller.text = task.customValue1;
    _custom2Controller.text = task.customValue2;

    _controllers.forEach((controller) => controller.addListener(_onChanged));

    super.didChangeDependencies();
  }

  @override
  void dispose() {
    _controllers.forEach((controller) {
      controller.removeListener(_onChanged);
      controller.dispose();
    });

    super.dispose();
  }

  void _onChanged() {
    final task = widget.viewModel.task.rebuild((b) => b
      ..description = _descriptionController.text.trim()
      ..customValue1 = _custom1Controller.text.trim()
      ..customValue2 = _custom2Controller.text.trim());
    if (task != widget.viewModel.task) {
      widget.viewModel.onChanged(task);
    }
  }

  @override
  Widget build(BuildContext context) {
    final viewModel = widget.viewModel;
    final localization = AppLocalization.of(context);
    final task = viewModel.task;
    final company = viewModel.company;
    final state = viewModel.state;

    return WillPopScope(
      onWillPop: () async {
        viewModel.onBackPressed();
        return true;
      },
      child: Scaffold(
        appBar: AppBar(
          title: Text(viewModel.task.isNew
              ? localization.newTask
              : localization.editTask),
          actions: <Widget>[
            Builder(builder: (BuildContext context) {
              return RefreshIconButton(
                icon: Icons.cloud_upload,
                tooltip: localization.save,
                isVisible: !task.isDeleted,
                isDirty: task.isNew || task != viewModel.origTask,
                isSaving: viewModel.isSaving,
                onPressed: () {
                  if (!_formKey.currentState.validate()) {
                    return;
                  }
                  viewModel.onSavePressed(context);
                },
              );
            }),
          ],
        ),
        body: Form(
            key: _formKey,
            child: Builder(builder: (BuildContext context) {
              return ListView(
                children: <Widget>[
                  FormCard(
                    children: <Widget>[
                      EntityDropdown(
                        key: Key('__client_${task.clientId}__'),
                        entityType: EntityType.client,
                        labelText: localization.client,
                        initialValue: (state.clientState.map[task.clientId] ??
                                ClientEntity())
                            .displayName,
                        entityMap: state.clientState.map,
                        entityList: memoizedDropdownClientList(
                            state.clientState.map, state.clientState.list),
                        onSelected: (client) {
                          viewModel.onChanged(task.rebuild((b) => b
                            ..clientId = client.id
                            ..projectId = 0));
                        },
                        onAddPressed: (completer) {
                          viewModel.onAddClientPressed(context, completer);
                        },
                      ),
                      EntityDropdown(
                        key: Key('__project_${task.clientId}__'),
                        entityType: EntityType.project,
                        labelText: localization.project,
                        initialValue: (state.projectState.map[task.projectId] ??
                                ProjectEntity())
                            .name,
                        entityMap: state.projectState.map,
                        entityList: memoizedDropdownProjectList(
                            state.projectState.map,
                            state.projectState.list,
                            task.clientId),
                        onSelected: (selected) {
                          final project = selected as ProjectEntity;
                          viewModel.onChanged(task.rebuild((b) => b
                            ..projectId = project.id
                            ..clientId = project.clientId));
                        },
                        onAddPressed: (completer) {
                          viewModel.onAddProjectPressed(context, completer);
                        },
                      ),
                      TextFormField(
                        maxLines: 4,
                        controller: _descriptionController,
                        keyboardType: TextInputType.multiline,
                        decoration: InputDecoration(
                          labelText: localization.description,
                        ),
                      ),
                      CustomField(
                        controller: _custom1Controller,
                        labelText:
                            company.getCustomFieldLabel(CustomFieldType.task1),
                        options:
                            company.getCustomFieldValues(CustomFieldType.task1),
                      ),
                      CustomField(
                        controller: _custom2Controller,
                        labelText:
                            company.getCustomFieldLabel(CustomFieldType.task2),
                        options:
                            company.getCustomFieldValues(CustomFieldType.task2),
                      ),
                    ],
                  ),
                ],
              );
            })),
      ),
    );
  }
}