import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:invoiceninja_flutter/constants.dart';
import 'package:invoiceninja_flutter/data/models/company_model.dart';
import 'package:invoiceninja_flutter/data/models/entities.dart';
import 'package:invoiceninja_flutter/ui/app/edit_scaffold.dart';
import 'package:invoiceninja_flutter/ui/app/form_card.dart';
import 'package:invoiceninja_flutter/ui/app/forms/app_form.dart';
import 'package:invoiceninja_flutter/ui/app/forms/decorated_form_field.dart';
import 'package:invoiceninja_flutter/ui/user/edit/user_edit_vm.dart';
import 'package:invoiceninja_flutter/ui/app/buttons/action_flat_button.dart';
import 'package:invoiceninja_flutter/utils/completers.dart';
import 'package:invoiceninja_flutter/utils/localization.dart';
import 'package:invoiceninja_flutter/utils/platforms.dart';
import 'package:invoiceninja_flutter/utils/strings.dart';

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

  final UserEditVM viewModel;

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

class _UserEditState extends State<UserEdit> {
  static final GlobalKey<FormState> _formKey =
      GlobalKey<FormState>(debugLabel: '_userEdit');
  final _debouncer = Debouncer();
  FocusScopeNode _focusNode;
  bool autoValidate = false;

  final _firstNameController = TextEditingController();
  final _lastNameController = TextEditingController();
  final _phoneController = TextEditingController();
  final _emailController = TextEditingController();

  List<TextEditingController> _controllers = [];

  @override
  void didChangeDependencies() {
    _controllers = [
      _firstNameController,
      _lastNameController,
      _emailController,
      _phoneController,
    ];

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

    final user = widget.viewModel.user;
    _firstNameController.text = user.firstName;
    _lastNameController.text = user.lastName;
    _emailController.text = user.email;
    _phoneController.text = user.phone;

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

    super.didChangeDependencies();
  }

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

    super.dispose();
  }

  void _onChanged() {
    _debouncer.run(() {
      final user = widget.viewModel.user.rebuild((b) => b
        ..firstName = _firstNameController.text.trim()
        ..lastName = _lastNameController.text.trim()
        ..email = _emailController.text.trim()
        ..phone = _phoneController.text.trim());
      if (user != widget.viewModel.user) {
        widget.viewModel.onUserChanged(user);
      }
    });
  }

  void _togglePermission(String permission) {
    final user = widget.viewModel.user;
    final userCompany = user.userCompany;

    final permissions = (userCompany.permissions ?? '').split(',');
    if (permissions.contains(permission)) {
      permissions.remove(permission);
    } else {
      permissions.add(permission);
    }
    final permissionsString =
        permissions.where((value) => value.isNotEmpty).join(',');

    widget.viewModel.onUserChanged(
        user.rebuild((b) => b..userCompany.permissions = permissionsString));
  }

  @override
  Widget build(BuildContext context) {
    final viewModel = widget.viewModel;
    final localization = AppLocalization.of(context);
    final user = viewModel.user;
    final userCompany = user.userCompany;

    return EditScaffold(
      title:
          viewModel.user.isNew ? localization.newUser : localization.editUser,
      onCancelPressed: (context) => viewModel.onCancelPressed(context),
      onSavePressed: (context) {
        if (!_formKey.currentState.validate()) {
          return;
        }
        viewModel.onSavePressed(context);
      },
      body: AppForm(
        focusNode: _focusNode,
        formKey: _formKey,
        children: <Widget>[
          FormCard(
            children: <Widget>[
              DecoratedFormField(
                label: localization.firstName,
                controller: _firstNameController,
                validator: (val) => val.isEmpty || val.trim().isEmpty
                    ? localization.pleaseEnterAFirstName
                    : null,
                autovalidate: autoValidate,
              ),
              DecoratedFormField(
                label: localization.lastName,
                controller: _lastNameController,
                validator: (val) => val.isEmpty || val.trim().isEmpty
                    ? localization.pleaseEnterALastName
                    : null,
                autovalidate: autoValidate,
              ),
              DecoratedFormField(
                label: localization.email,
                controller: _emailController,
                validator: (val) => val.isEmpty || val.trim().isEmpty
                    ? localization.pleaseEnterYourEmail
                    : null,
                autovalidate: autoValidate,
              ),
              DecoratedFormField(
                label: localization.phone,
                controller: _phoneController,
              ),
            ],
          ),
          FormCard(
            children: <Widget>[
              SwitchListTile(
                title: Text(localization.administrator),
                subtitle: Text(localization.administratorHelp),
                value: userCompany.isAdmin ?? false,
                onChanged: (value) => viewModel.onUserChanged(
                    user.rebuild((b) => b..userCompany.isAdmin = value)),
                activeColor: Theme.of(context).accentColor,
              ),
            ],
          ),
          if (!userCompany.isAdmin)
            FormCard(
              child: SingleChildScrollView(
                scrollDirection: Axis.horizontal,
                child: DataTable(
                  columns: [
                    DataColumn(
                      label: SizedBox(),
                    ),
                    DataColumn(
                      label: Text(localization.create),
                    ),
                    DataColumn(
                      label: Text(localization.view),
                    ),
                    DataColumn(
                      label: Text(localization.edit),
                    ),
                  ],
                  rows: [
                    DataRow(cells: [
                      DataCell(Text(localization.all)),
                      DataCell(
                          _PermissionCheckbox(
                            userCompany: userCompany,
                            permission: kPermissionCreateAll,
                            onChanged: (value) =>
                                _togglePermission(kPermissionCreateAll),
                          ),
                          onTap: () => _togglePermission(kPermissionCreateAll)),
                      DataCell(
                          _PermissionCheckbox(
                            userCompany: userCompany,
                            permission: kPermissionViewAll,
                            onChanged: (value) =>
                                _togglePermission(kPermissionViewAll),
                          ),
                          onTap: () => _togglePermission(kPermissionViewAll)),
                      DataCell(
                          _PermissionCheckbox(
                            userCompany: userCompany,
                            permission: kPermissionEditAll,
                            onChanged: (value) =>
                                _togglePermission(kPermissionEditAll),
                          ),
                          onTap: () => _togglePermission(kPermissionEditAll)),
                    ]),
                    ...<EntityType>[
                      EntityType.client,
                      EntityType.product,
                      EntityType.invoice,
                      EntityType.payment,
                      EntityType.quote,
                    ].map((EntityType type) {
                      final createPermission = 'create_' + toSnakeCase('$type');
                      final editPermission = 'edit_' + toSnakeCase('$type');
                      final viewPermission = 'view_' + toSnakeCase('$type');
                      return DataRow(cells: [
                        DataCell(Text(localization.lookup('$type'))),
                        DataCell(
                            _PermissionCheckbox(
                              userCompany: userCompany,
                              permission: createPermission,
                              onChanged: (value) =>
                                  _togglePermission(createPermission),
                              checkAll: userCompany.permissions
                                  .contains(kPermissionCreateAll),
                            ),
                            onTap: userCompany.permissions
                                    .contains(kPermissionCreateAll)
                                ? null
                                : () => _togglePermission(createPermission)),
                        DataCell(
                            _PermissionCheckbox(
                              userCompany: userCompany,
                              permission: viewPermission,
                              onChanged: (value) =>
                                  _togglePermission(viewPermission),
                              checkAll: userCompany.permissions
                                  .contains(kPermissionViewAll),
                            ),
                            onTap: userCompany.permissions
                                    .contains(kPermissionViewAll)
                                ? null
                                : () => _togglePermission(viewPermission)),
                        DataCell(
                            _PermissionCheckbox(
                              userCompany: userCompany,
                              permission: editPermission,
                              onChanged: (value) =>
                                  _togglePermission(editPermission),
                              checkAll: userCompany.permissions
                                  .contains(kPermissionEditAll),
                            ),
                            onTap: userCompany.permissions
                                    .contains(kPermissionEditAll)
                                ? null
                                : () => _togglePermission(editPermission)),
                      ]);
                    }).toList()
                  ],
                ),
              ),
            )
        ],
      ),
    );
  }
}

class _PermissionCheckbox extends StatelessWidget {
  const _PermissionCheckbox({
    @required this.userCompany,
    @required this.permission,
    @required this.onChanged,
    this.checkAll = false,
  });

  final UserCompanyEntity userCompany;
  final String permission;
  final Function(bool) onChanged;
  final bool checkAll;

  @override
  Widget build(BuildContext context) {
    return Checkbox(
      value: checkAll
          ? true
          : (userCompany.permissions ?? '').contains(permission),
      onChanged: checkAll ? null : onChanged,
      activeColor: Theme.of(context).accentColor,
    );
  }
}