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RESTHeart MongoDB - GraphQL plugin
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/*-
 * ========================LICENSE_START=================================
 * restheart-graphql
 * %%
 * Copyright (C) 2020 - 2024 SoftInstigate
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 * =========================LICENSE_END==================================
 */
package org.restheart.graphql.scalars.bsonCoercing;

import java.util.Locale;

import org.bson.BsonDecimal128;
import org.bson.BsonNull;
import org.bson.BsonValue;
import org.bson.types.Decimal128;
import static org.restheart.graphql.scalars.bsonCoercing.CoercingUtils.typeName;
import org.restheart.utils.BsonUtils;

import graphql.GraphQLContext;
import graphql.execution.CoercedVariables;
import graphql.language.FloatValue;
import graphql.language.IntValue;
import graphql.language.StringValue;
import graphql.language.Value;
import graphql.schema.Coercing;
import graphql.schema.CoercingParseLiteralException;
import graphql.schema.CoercingParseValueException;
import graphql.schema.CoercingSerializeException;

public class GraphQLBsonDecimal128Coercing implements Coercing {
    @Override
    public Decimal128 serialize(Object input, GraphQLContext graphQLContext, Locale locale) throws CoercingSerializeException {
        if(input == null || input instanceof BsonNull) {
            return null;
        }

        var possibleDecimal = convertImpl(input);
        if (possibleDecimal == null){
            throw new CoercingSerializeException("Expected type 'Decimal128' but was '" + typeName(input) +"'.");
        } else {
            return possibleDecimal;
        }
    }

    @Override
    public BsonDecimal128 parseValue(Object input, GraphQLContext graphQLContext, Locale locale) throws CoercingParseValueException {
        var possibleDecimal = convertImpl(input);
        if (possibleDecimal == null){
            throw new CoercingParseValueException("Expected type 'Decimal128' but was '" + typeName(input) +"'.");
        } else {
            return new BsonDecimal128(possibleDecimal);
        }
    }

    @Override
    public BsonDecimal128 parseLiteral(Value input, CoercedVariables variables, GraphQLContext graphQLContext, Locale locale) throws CoercingParseLiteralException {
        if (input instanceof StringValue || input instanceof IntValue || input instanceof FloatValue){
            var value = switch (input) {
                case IntValue intValue -> intValue.getValue().toString();
                case FloatValue floatValue -> floatValue.getValue().toString();
                case StringValue stringValue -> stringValue.getValue();
                default -> null;
            };

            if (value == null) {
                throw new CoercingParseLiteralException("Expected value to be an int a float or a string but it was '" + input + "'");
            }

            var dec = Decimal128.parse(value);

            if(dec.isNaN()){
                throw new CoercingParseLiteralException("Expected value to be a number but it was '" + dec.toString() + "'");
            } else {
                return new BsonDecimal128(dec);
            }
        } else {
            throw  new CoercingParseLiteralException("Expected AST type 'StringValue' but was '" + typeName(input) + "'.");
        }
    }

    private Decimal128 convertImpl(Object obj){
        if (isANumber(obj)){
            var value = Decimal128.parse(obj.toString());
            return value.isNaN() ? value : null;
        } else if (obj instanceof BsonValue bsonValue){
            return bsonValue.isDecimal128() ? bsonValue.asDecimal128().getValue() : null;
        } else {
            return null;
        }
    }

    private boolean isANumber(Object input) {
        return input instanceof Number || input instanceof String;
    }

    @Override
    public Value valueToLiteral(Object input, GraphQLContext graphQLContext, Locale locale) {
        var value = parseValue(input, graphQLContext, locale);
        var s = BsonUtils.toJson(value);
        return StringValue.newStringValue(s).build();
    }
}