/*
 * Copyright (c) 2022-present Charles7c Authors. All Rights Reserved.
 *
 * 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 top.charles7c.cnadmin.common.config.jackson;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.ser.std.NumberSerializer;

/**
 * 大数值序列化器（针对数值超出 JS 最大或最小值的情况，将其转换为字符串）
 *
 * @author Charles7c
 * @since 2022/12/11 13:22
 */
@JacksonStdImpl
public class BigNumberSerializer extends NumberSerializer {

    /** 静态实例 */
    public static final BigNumberSerializer SERIALIZER_INSTANCE = new BigNumberSerializer(Number.class);
    /** JS：Number.MAX_SAFE_INTEGER */
    private static final long MAX_SAFE_INTEGER = 9007199254740991L;
    /** JS：Number.MIN_SAFE_INTEGER */
    private static final long MIN_SAFE_INTEGER = -9007199254740991L;

    public BigNumberSerializer(Class<? extends Number> rawType) {
        super(rawType);
    }

    @Override
    public void serialize(Number value, JsonGenerator generator, SerializerProvider provider) throws IOException {
        // 序列化为字符串
        if (value.longValue() > MIN_SAFE_INTEGER && value.longValue() < MAX_SAFE_INTEGER) {
            super.serialize(value, generator, provider);
        } else {
            generator.writeString(value.toString());
        }
    }
}
