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/*
 * Copyright The Stargate 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
 *
 * 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 io.stargate.sgv2.graphql.schema.scalars;

import graphql.language.FloatValue;
import graphql.language.IntValue;
import graphql.schema.Coercing;
import graphql.schema.CoercingParseLiteralException;
import graphql.schema.CoercingParseValueException;
import graphql.schema.CoercingSerializeException;
import java.math.BigDecimal;
import java.math.BigInteger;

/**
 * We follow the same rules as CQL: parsing a double literal may lead to a loss of precision, and
 * values that are out of range are converted to positive or negative infinity.
 */
class FloatCoercing implements Coercing {

  static FloatCoercing INSTANCE = new FloatCoercing();

  private FloatCoercing() {}

  @Override
  public Float serialize(Object dataFetcherResult) throws CoercingSerializeException {
    return (Float) dataFetcherResult;
  }

  @Override
  public Float parseValue(Object input) throws CoercingParseValueException {
    if (input instanceof Number) {
      return ((Number) input).floatValue();
    } else {
      throw new CoercingParseLiteralException("Expected an integer or float literal");
    }
  }

  @Override
  public Float parseLiteral(Object input) throws CoercingParseLiteralException {
    if (input instanceof IntValue) {
      BigInteger bi = ((IntValue) input).getValue();
      return bi.floatValue();
    } else if (input instanceof FloatValue) {
      BigDecimal bd = ((FloatValue) input).getValue();
      return bd.floatValue();
    } else {
      throw new CoercingParseLiteralException("Expected an integer or float literal");
    }
  }
}