/*
    *    Copyright 2016-2025 the original author or authors.
    *
    *    Licensed 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
    *
    *       https://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.mybatis.dynamic.sql.select.function;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.stream.Collectors;
  
  import org.mybatis.dynamic.sql.BasicColumn;
  import org.mybatis.dynamic.sql.BindableColumn;
  import org.mybatis.dynamic.sql.render.RenderingContext;
  import org.mybatis.dynamic.sql.util.FragmentAndParameters;
  import org.mybatis.dynamic.sql.util.FragmentCollector;
  
  public class Concat<T> extends AbstractUniTypeFunction<T, Concat<T>> {
      private final List<BasicColumn> allColumns = new ArrayList<>();
  
      protected Concat(BasicColumn firstColumn, List<BasicColumn> subsequentColumns) {
          super(firstColumn);
          allColumns.add(firstColumn);
          this.allColumns.addAll(subsequentColumns);
      }
  
      @Override
      public FragmentAndParameters render(RenderingContext renderingContext) {
          // note - the cast below is added for type inference issues in some compilers
          return allColumns.stream()
                  .map(column -> column.render(renderingContext))
                  .collect(FragmentCollector.collect()).toFragmentAndParameters(
                          Collectors.joining(", ", "concat(", ")")); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
      }
  
      @Override
      protected Concat<T> copy() {
          return new Concat<>(column, allColumns.subList(1, allColumns.size()));
      }
  
      public static <T> Concat<T> concat(BindableColumn<T> firstColumn, BasicColumn... subsequentColumns) {
          return new Concat<>(firstColumn, Arrays.asList(subsequentColumns));
      }
  
      public static <T> Concat<T> of(BindableColumn<T> firstColumn, List<BasicColumn> subsequentColumns) {
          return new Concat<>(firstColumn, subsequentColumns);
      }
  }