/*
    *    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.aggregate;
  
  import java.util.function.Function;
  
  import org.mybatis.dynamic.sql.BasicColumn;
  import org.mybatis.dynamic.sql.BindableColumn;
  import org.mybatis.dynamic.sql.RenderableCondition;
  import org.mybatis.dynamic.sql.render.RenderingContext;
  import org.mybatis.dynamic.sql.select.function.AbstractUniTypeFunction;
  import org.mybatis.dynamic.sql.util.FragmentAndParameters;
  import org.mybatis.dynamic.sql.util.Validator;
  import org.mybatis.dynamic.sql.where.render.ColumnAndConditionRenderer;
  
  public class Sum<T> extends AbstractUniTypeFunction<T, Sum<T>> {
      private final Function<RenderingContext, FragmentAndParameters> renderer;
  
      private Sum(BasicColumn column) {
          super(column);
          renderer = rc -> column.render(rc).mapFragment(this::applyAggregate);
      }
  
      private Sum(BindableColumn<T> column, RenderableCondition<T> condition) {
          super(column);
          renderer = rc -> {
              Validator.assertTrue(condition.shouldRender(rc), "ERROR.37", "sum"); //$NON-NLS-1$ //$NON-NLS-2$
  
              return new ColumnAndConditionRenderer.Builder<T>()
                      .withColumn(column)
                      .withCondition(condition)
                      .withRenderingContext(rc)
                      .build()
                      .render()
                      .mapFragment(this::applyAggregate);
          };
      }
  
      private Sum(BasicColumn column, Function<RenderingContext, FragmentAndParameters> renderer) {
          super(column);
          this.renderer = renderer;
      }
  
      @Override
      public FragmentAndParameters render(RenderingContext renderingContext) {
          return renderer.apply(renderingContext);
      }
  
      private String applyAggregate(String s) {
          return "sum(" + s + ")"; //$NON-NLS-1$ //$NON-NLS-2$
      }
  
      @Override
      protected Sum<T> copy() {
          return new Sum<>(column, renderer);
      }
  
      public static <T> Sum<T> of(BindableColumn<T> column) {
          return new Sum<>(column);
      }
  
      public static Sum<Object> of(BasicColumn column) {
          return new Sum<>(column);
      }
  
      public static <T> Sum<T> of(BindableColumn<T> column, RenderableCondition<T> condition) {
          return new Sum<>(column, condition);
      }
  }