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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;

/**
 * Created by luigidellaquila on 08/08/16.
 */

import com.arcadedb.exception.CommandExecutionException;

import java.util.*;

import static com.arcadedb.query.sql.executor.AbstractExecutionStep.DEFAULT_FETCH_RECORDS_PER_PULL;

/**
 * @author Luigi Dell'Aquila (luigi.dellaquila-(at)-gmail.com)
 */
public class UpdateExecutionPlan extends SelectExecutionPlan {

  final List result = new ArrayList<>();
  int next = 0;

  public UpdateExecutionPlan(final CommandContext context) {
    super(context);
  }

  @Override
  public ResultSet fetchNext(final int n) {
    if (next >= result.size()) {
      return new InternalResultSet();//empty
    }

    final IteratorResultSet nextBlock = new IteratorResultSet(result.subList(next, Math.min(next + n, result.size())).iterator());
    next += n;
    return nextBlock;
  }

  @Override
  public void reset(final CommandContext context) {
    result.clear();
    next = 0;
    super.reset(context);
    executeInternal();
  }

  public void executeInternal() throws CommandExecutionException {
    while (true) {
      final ResultSet nextBlock = super.fetchNext(DEFAULT_FETCH_RECORDS_PER_PULL);
      if (!nextBlock.hasNext()) {
        return;
      }
      while (nextBlock.hasNext()) {
        result.add(nextBlock.next());
      }
    }
  }

  @Override
  public Result toResult() {
    final ResultInternal res = (ResultInternal) super.toResult();
    res.setProperty("type", "UpdateExecutionPlan");
    return res;
  }

  @Override
  public boolean canBeCached() {
    return false;
  }
}