content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
   *  with the License.  You may obtain a copy of the License at
   *
   *        http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License.
   */
  package org.apache.causeway.core.metamodel.tabular.simple;
  
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.commons.functional.IndexedFunction;
  import org.apache.causeway.commons.tabular.TabularModel;
  import org.apache.causeway.core.metamodel.consent.InteractionInitiatedBy;
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  
  import lombok.experimental.UtilityClass;
  
  @UtilityClass
  class TabularUtil {
  
      /**
       * Converts a {@link DataTable} to a {@link TabularModel.TabularSheet}.
       */
      TabularModel.TabularSheet toTabularSheet(
              final DataTable dataTable,
              final DataTable.AccessMode accessMode) {
          var interactionInitiatedBy = switch(accessMode) {
              case PASS_THROUGH -> InteractionInitiatedBy.PASS_THROUGH;
              default -> InteractionInitiatedBy.USER;
          };
  
          var columns = dataTable.dataColumns()
                  .map(IndexedFunction.zeroBased(TabularUtil::tabularColumn));
          var rows = dataTable.dataRows()
                  .map(dr->tabularRow(dataTable.dataColumns(), dr, interactionInitiatedBy));
          return new TabularModel.TabularSheet(dataTable.tableFriendlyName(), columns, rows);
      }
  
      // -- HELPER
  
      private TabularModel.TabularColumn tabularColumn(final int index, final DataColumn dc) {
          return new TabularModel.TabularColumn(
                  index,
                  dc.columnFriendlyName(),
                  dc.columnDescription().orElse(""));
      }
  
      private TabularModel.TabularRow tabularRow(
              final Can<DataColumn> dataColumns,
              final DataRow dataRow,
              final InteractionInitiatedBy interactionInitiatedBy) {
          var cells = dataColumns.map(dataColumn->{
              var cellElements = dataRow.getCellElements(dataColumn, interactionInitiatedBy);
              final int cardinality = cellElements.size();
              final boolean forceUseTitle = !dataColumn.metamodel().getElementType().isValue();
  
              var tabularCell = cardinality==1
                      && !forceUseTitle
                  ? TabularModel.TabularCell.single(cellElements.getFirstElseFail().getPojo())
                  : TabularModel.TabularCell.labeled(cardinality, ()->cellElements.map(ManagedObject::getTitle).stream());
              return tabularCell;
          })
          .toList();
  
          return new TabularModel.TabularRow(Can.ofCollection(cells));
      }
  
  }
  