Select::make('relation_id')
                    ->label(__('Relation'))
                    ->relationship('relation', 'name')
                    ->live()
                    ->searchable()
                    ->preload()
                    ->required()
                    ->afterStateUpdated(function (callable $set) {
                        $set('parent_project_id', null);
                        $set('contact_id', null);
                    }),
                Select::make('parent_project_id')
                    ->label(__('Parent project'))
                    ->relationship(
                        name: 'parentProject',
                        titleAttribute: 'name',
                        modifyQueryUsing: fn (Builder $query, Get $get) =>
                            $query
                                // Only projects with the same relation (with null check)
                                ->where('relation_id', $get('relation_id'))
                                // Apply exclusions only when editing
                                ->when($get('id'), function (Builder $query, $id) {
                                    return $query
                                        // Exclude the current project
                                        ->where('id', '!=', $id)
                                        // Exclude all child projects (projects that have this project as their parent)
                                        ->whereNotIn('id', function ($subQuery) use ($id) {
                                            $subQuery->select('id')
                                                ->from('projects')
                                                ->where('parent_project_id', $id);
                                        });
                                })
                    )
                    ->getOptionLabelFromRecordUsing(fn ($record) => $record->number_with_name)
                    ->searchable()
                    ->preload()
                    ->live(),
                Select::make('contact_id')
                    ->label(__('Contact'))
                    ->relationship(
                        name: 'contact',
                        titleAttribute: 'name',
                        modifyQueryUsing: fn (Builder $query, Get $get) =>
                            $query->whereHas(
                                'relations',
                                fn (Builder $query) =>
                                    $query->where('id', '=', $get('relation_id'))
                            )
                    )
                    ->live()
                    ->getOptionLabelFromRecordUsing(fn ($record) => $record->name)
                    ->preload()
                    ->searchable()
                    ->required(),
                TextInput::make('number')
                    ->label(__('Project number'))
                    ->unique()
                    ->integer()
                    ->mask('999999999')
                    ->minLength(1)
                    ->maxLength(9)
                    ->belowContent(fn () => __('Latest project number: :number', [
                        'number' => Project::latestProjectNumber(),
                    ]))
                    ->required(),
                TextInput::make('name')
                    ->label(__('Project name'))
                    ->required()
                    ->partiallyRenderAfterStateUpdated()
                    ->suffix(function (Get $get) {
                        if (! $get('auto_fill_name_suffix')) {
                            return null;
                        }

                        $relationName = null;
                        $contactName = null;

                        if ($relationId = $get('relation_id')) {
                            $relation = Relation::find($relationId);
                            $relationName = $relation?->name;
                        }

                        if ($contactId = $get('contact_id')) {
                            $contact = Contact::find($contactId);
                            $contactName = $contact?->name;
                        }

                        return Str::of(' ')
                            ->when($relationName, fn ($str) => $str->append("{$relationName}"))
                            ->when($contactName, fn ($str) => $str->append(" {$contactName}"));
                    }, isInline: true)
                    ->belowContent([
                        Checkbox::make('auto_fill_name_suffix')
                            ->label(__('Auto-fill name suffix'))
                            ->helperText(__('Automatically append the relation and contact name to the project name.'))
                            ->dehydrated(false)
                            ->reactive()
                            ->afterStateUpdated(fn (Set $set) => $set('name', null)),
                    ]),