/*
    *    Copyright 2016-2026 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;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Objects;
  import java.util.Optional;
  import java.util.function.Function;
  import java.util.stream.Stream;
  
  import org.jspecify.annotations.Nullable;
  import org.mybatis.dynamic.sql.render.RenderingStrategy;
  import org.mybatis.dynamic.sql.select.render.SelectRenderer;
  import org.mybatis.dynamic.sql.select.render.SelectStatementProvider;
  import org.mybatis.dynamic.sql.util.Validator;
  
  public class SelectModel extends AbstractSelectModel {
      private final List<QueryExpressionModel> queryExpressions;
      private final @Nullable String forClause;
      private final @Nullable String waitClause;
  
      private SelectModel(Builder builder) {
          super(builder);
          queryExpressions = Objects.requireNonNull(builder.queryExpressions);
          Validator.assertNotEmpty(queryExpressions, "ERROR.14"); //$NON-NLS-1$
          forClause = builder.forClause;
          waitClause = builder.waitClause;
      }
  
      public Stream<QueryExpressionModel> queryExpressions() {
          return queryExpressions.stream();
      }
  
      public Optional<String> forClause() {
          return Optional.ofNullable(forClause);
      }
  
      public Optional<String> waitClause() {
          return Optional.ofNullable(waitClause);
      }
  
      public SelectStatementProvider render(RenderingStrategy renderingStrategy) {
          return SelectRenderer.withSelectModel(this)
                  .withRenderingStrategy(renderingStrategy)
                  .build()
                  .render();
      }
  
      public <R> R map(Function<SelectModel, R> mapper) {
          return mapper.apply(this);
      }
  
      public static Builder withQueryExpressions(List<QueryExpressionModel> queryExpressions) {
          return new Builder().withQueryExpressions(queryExpressions);
      }
  
      public static class Builder extends AbstractBuilder<Builder> {
          private final List<QueryExpressionModel> queryExpressions = new ArrayList<>();
          private @Nullable String forClause;
          private @Nullable String waitClause;
  
          public Builder withQueryExpression(QueryExpressionModel queryExpression) {
              this.queryExpressions.add(queryExpression);
              return this;
          }
  
          public Builder withQueryExpressions(List<QueryExpressionModel> queryExpressions) {
              this.queryExpressions.addAll(queryExpressions);
              return this;
          }
  
          public Builder withForClause(@Nullable String forClause) {
              this.forClause = forClause;
              return this;
          }
  
          public Builder withWaitClause(@Nullable String waitClause) {
              this.waitClause = waitClause;
              return this;
          }
  
          @Override
          protected Builder getThis() {
              return this;
          }
 
         public SelectModel build() {
             return new SelectModel(this);
         }
     }
 }