/*
    * 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.shardingsphere.infra.binder.segment.projection;
  
  import lombok.AccessLevel;
  import lombok.NoArgsConstructor;
  import org.apache.shardingsphere.infra.binder.enums.SegmentType;
  import org.apache.shardingsphere.infra.binder.segment.expression.ExpressionSegmentBinder;
  import org.apache.shardingsphere.infra.binder.segment.from.TableSegmentBinderContext;
  import org.apache.shardingsphere.infra.binder.segment.projection.impl.ColumnProjectionSegmentBinder;
  import org.apache.shardingsphere.infra.binder.segment.projection.impl.ShorthandProjectionSegmentBinder;
  import org.apache.shardingsphere.infra.binder.segment.projection.impl.SubqueryProjectionSegmentBinder;
  import org.apache.shardingsphere.infra.binder.statement.SQLStatementBinderContext;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.item.ColumnProjectionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.item.ExpressionProjectionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.item.ProjectionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.item.ProjectionsSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.item.ShorthandProjectionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.item.SubqueryProjectionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.generic.table.TableSegment;
  
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  /**
   * Projections segment binder.
   */
  @NoArgsConstructor(access = AccessLevel.PRIVATE)
  public final class ProjectionsSegmentBinder {
      
      /**
       * Bind projections segment with metadata.
       *
       * @param segment table segment
       * @param statementBinderContext statement binder context
       * @param boundedTableSegment bounded table segment
       * @param tableBinderContexts table binder contexts
       * @param outerTableBinderContexts outer table binder contexts
       * @return bounded projections segment
       */
      public static ProjectionsSegment bind(final ProjectionsSegment segment, final SQLStatementBinderContext statementBinderContext, final TableSegment boundedTableSegment,
                                            final Map<String, TableSegmentBinderContext> tableBinderContexts, final Map<String, TableSegmentBinderContext> outerTableBinderContexts) {
          ProjectionsSegment result = new ProjectionsSegment(segment.getStartIndex(), segment.getStopIndex());
          result.setDistinctRow(segment.isDistinctRow());
          segment.getProjections().forEach(each -> result.getProjections().add(bind(each, statementBinderContext, boundedTableSegment, tableBinderContexts, outerTableBinderContexts)));
          return result;
      }
      
      private static ProjectionSegment bind(final ProjectionSegment projectionSegment, final SQLStatementBinderContext statementBinderContext,
                                            final TableSegment boundedTableSegment, final Map<String, TableSegmentBinderContext> tableBinderContexts,
                                            final Map<String, TableSegmentBinderContext> outerTableBinderContexts) {
          if (projectionSegment instanceof ColumnProjectionSegment) {
              return ColumnProjectionSegmentBinder.bind((ColumnProjectionSegment) projectionSegment, statementBinderContext, tableBinderContexts);
          }
          if (projectionSegment instanceof ShorthandProjectionSegment) {
              return ShorthandProjectionSegmentBinder.bind((ShorthandProjectionSegment) projectionSegment, boundedTableSegment, tableBinderContexts);
          }
          if (projectionSegment instanceof SubqueryProjectionSegment) {
              Map<String, TableSegmentBinderContext> newOuterTableBinderContexts = new LinkedHashMap<>();
              newOuterTableBinderContexts.putAll(outerTableBinderContexts);
              newOuterTableBinderContexts.putAll(tableBinderContexts);
              return SubqueryProjectionSegmentBinder.bind((SubqueryProjectionSegment) projectionSegment, statementBinderContext, newOuterTableBinderContexts);
          }
          if (projectionSegment instanceof ExpressionProjectionSegment) {
              ExpressionProjectionSegment result = new ExpressionProjectionSegment(projectionSegment.getStartIndex(), projectionSegment.getStopIndex(),
                      ((ExpressionProjectionSegment) projectionSegment).getText(), ExpressionSegmentBinder.bind(((ExpressionProjectionSegment) projectionSegment).getExpr(), SegmentType.PROJECTION,
                              statementBinderContext, tableBinderContexts, outerTableBinderContexts));
              result.setAlias(((ExpressionProjectionSegment) projectionSegment).getAliasSegment());
              return result;
          }
          // TODO support more ProjectionSegment bind
          return projectionSegment;
      }
  }