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/*
 * Copyright © 2021-present Arcade Data Ltd ([email protected])
 *
 * 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
 *
 *     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.
 *
 * SPDX-FileCopyrightText: 2021-present Arcade Data Ltd ([email protected])
 * SPDX-License-Identifier: Apache-2.0
 */
package com.arcadedb.query.sql.executor;

import com.arcadedb.query.sql.parser.WhereClause;

import java.util.*;

/**
 * Created by luigidellaquila on 13/10/16.
 */
public class WhileMatchStep extends AbstractUnrollStep {

  private final InternalExecutionPlan body;
  private final WhereClause           condition;

  public WhileMatchStep(final CommandContext context, final WhereClause condition, final InternalExecutionPlan body, final boolean profilingEnabled) {
    super(context, profilingEnabled);
    this.body = body;
    this.condition = condition;
  }

  @Override
  protected Collection unroll(final Result doc, final CommandContext iContext) {
    body.reset(iContext);
    final List result = new ArrayList<>();
    ResultSet block = body.fetchNext(DEFAULT_FETCH_RECORDS_PER_PULL);
    while (block.hasNext()) {
      while (block.hasNext()) {
        result.add(block.next());
      }
      block = body.fetchNext(DEFAULT_FETCH_RECORDS_PER_PULL);
    }
    return result;
  }

  @Override
  public String prettyPrint(final int depth, final int indent) {
    final String indentStep = ExecutionStepInternal.getIndent(1, indent);
    final String spaces = ExecutionStepInternal.getIndent(depth, indent);

    return spaces + "+ WHILE\n" + spaces + indentStep + condition.toString() + "\n" + spaces + "  DO\n" + body.prettyPrint(depth + 1, indent) + "\n" + spaces
        + "  END\n";
  }
}