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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.function.math;

import com.arcadedb.database.Identifiable;
import com.arcadedb.query.sql.executor.CommandContext;
import com.arcadedb.schema.Type;

import java.util.*;

/**
 * Compute the maximum value for a field. Uses the context to save the last maximum number. When different Number class are used,
 * take the class with most precision.
 *
 * @author Luca Garulli (l.garulli--(at)--gmail.com)
 */
public class SQLFunctionMax extends SQLFunctionMathAbstract {
  public static final String NAME = "max";

  private Object context;

  public SQLFunctionMax() {
    super(NAME);
  }

  @SuppressWarnings({ "unchecked", "rawtypes" })
  public Object execute(final Object iThis, final Identifiable iCurrentRecord, final Object iCurrentResult, final Object[] iParams,
      final CommandContext iContext) {
    // calculate max value for current record
    // consider both collection of parameters and collection in each parameter
    Object max = null;
    for (Object item : iParams) {
      if (item instanceof Collection) {
        for (final Object subitem : ((Collection) item)) {
          if (max == null || subitem != null && ((Comparable) subitem).compareTo(max) > 0)
            max = subitem;
        }
      } else {
        if (item instanceof Number && max instanceof Number &&//
            !item.getClass().equals(max.getClass())) {
          final Number[] converted = Type.castComparableNumber((Number) item, (Number) max);
          item = converted[0];
          max = converted[1];
        }
        if (max == null || item != null && ((Comparable) item).compareTo(max) > 0)
          max = item;
      }
    }

    // what to do with the result, for current record, depends on how this function has been invoked
    // for an unique result aggregated from all output records
    if (aggregateResults() && max != null) {
      if (context == null)
        // FIRST TIME
        context = max;
      else {
        if (context instanceof Number && max instanceof Number) {
          final Number[] casted = Type.castComparableNumber((Number) context, (Number) max);
          context = casted[0];
          max = casted[1];
        }
        if (((Comparable