/*
 * Copyright (c) 2011-2025, baomidou (jobob@qq.com).
 *
 * 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 com.baomidou.mybatisplus.extension.handlers;

import com.baomidou.mybatisplus.core.toolkit.Assert;
import com.fasterxml.jackson.core.JacksonException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.TypeFactory;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.MappedJdbcTypes;
import org.apache.ibatis.type.MappedTypes;

import java.lang.reflect.Field;

/**
 * Jackson 实现 JSON 字段类型处理器
 *
 * @author hubin
 * @since 2019-08-25
 */
@MappedTypes({Object.class})
@MappedJdbcTypes(JdbcType.VARCHAR)
public class JacksonTypeHandler extends AbstractJsonTypeHandler<Object> {

    private static ObjectMapper OBJECT_MAPPER;

    public JacksonTypeHandler(Class<?> type) {
        super(type);
    }

    public JacksonTypeHandler(Class<?> type, Field field) {
        super(type, field);
    }

    @Override
    public Object parse(String json) {
        ObjectMapper objectMapper = getObjectMapper();
        TypeFactory typeFactory = objectMapper.getTypeFactory();
        JavaType javaType = typeFactory.constructType(getFieldType());
        try {
            return objectMapper.readValue(json, javaType);
        } catch (JacksonException e) {
            log.error("deserialize json: " + json + " to " + javaType + " error ", e);
            throw new RuntimeException(e);
        }
    }

    @Override
    public String toJson(Object obj) {
        try {
            return getObjectMapper().writeValueAsString(obj);
        } catch (JsonProcessingException e) {
            log.error("serialize " + obj + " to json error ", e);
            throw new RuntimeException(e);
        }
    }

    public static ObjectMapper getObjectMapper() {
        return OBJECT_MAPPER == null ? Instance.OBJECT_MAPPER : OBJECT_MAPPER;
    }

    public static void setObjectMapper(ObjectMapper objectMapper) {
        Assert.notNull(objectMapper, "ObjectMapper should not be null");
        JacksonTypeHandler.OBJECT_MAPPER = objectMapper;
    }

    /**
     * @since 3.5.15
     */
    private static class Instance {

        private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();

    }

}
