/*
    *    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.render;
  
  import java.util.Objects;
  import java.util.stream.Collectors;
  
  import org.jspecify.annotations.Nullable;
  import org.mybatis.dynamic.sql.exception.InvalidSqlException;
  import org.mybatis.dynamic.sql.render.RenderingContext;
  import org.mybatis.dynamic.sql.select.join.JoinModel;
  import org.mybatis.dynamic.sql.select.join.JoinSpecification;
  import org.mybatis.dynamic.sql.util.FragmentAndParameters;
  import org.mybatis.dynamic.sql.util.FragmentCollector;
  import org.mybatis.dynamic.sql.util.Messages;
  
  public class JoinRenderer {
      private final JoinModel joinModel;
      private final TableExpressionRenderer tableExpressionRenderer;
      private final RenderingContext renderingContext;
  
      private JoinRenderer(Builder builder) {
          joinModel = Objects.requireNonNull(builder.joinModel);
          tableExpressionRenderer = Objects.requireNonNull(builder.tableExpressionRenderer);
          renderingContext = Objects.requireNonNull(builder.renderingContext);
      }
  
      public FragmentAndParameters render() {
          return joinModel.joinSpecifications()
                  .map(this::renderJoinSpecification)
                  .collect(FragmentCollector.collect())
                  .toFragmentAndParameters(Collectors.joining(" ")); //$NON-NLS-1$
      }
  
      private FragmentAndParameters renderJoinSpecification(JoinSpecification joinSpecification) {
          FragmentCollector fc = new FragmentCollector();
          fc.add(FragmentAndParameters.fromFragment(joinSpecification.joinType().type()));
          fc.add(joinSpecification.table().accept(tableExpressionRenderer));
          fc.add(JoinSpecificationRenderer
                  .withJoinSpecification(joinSpecification)
                  .withRenderingContext(renderingContext)
                  .build()
                  .render()
                  .orElseThrow(() -> new InvalidSqlException(Messages.getString("ERROR.46")))); //$NON-NLS-1$
  
          return fc.toFragmentAndParameters(Collectors.joining(" ")); //$NON-NLS-1$
      }
  
      public static Builder withJoinModel(JoinModel joinModel) {
          return new Builder().withJoinModel(joinModel);
      }
  
      public static class Builder {
          private @Nullable JoinModel joinModel;
          private @Nullable TableExpressionRenderer tableExpressionRenderer;
          private @Nullable RenderingContext renderingContext;
  
          public Builder withJoinModel(JoinModel joinModel) {
              this.joinModel = joinModel;
              return this;
          }
  
          public Builder withTableExpressionRenderer(TableExpressionRenderer tableExpressionRenderer) {
              this.tableExpressionRenderer = tableExpressionRenderer;
              return this;
          }
  
          public Builder withRenderingContext(RenderingContext renderingContext) {
              this.renderingContext = renderingContext;
              return this;
          }
  
          public JoinRenderer build() {
              return new JoinRenderer(this);
          }
      }
  }