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package lodsve.mvc.convert;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import lodsve.core.bean.Codeable;
import lodsve.core.utils.StringUtils;

import java.io.IOException;

/**
 * Jackson反序列化枚举时，将code或者枚举value变成枚举.

 * {@link lodsve.mvc.json.CustomObjectMapper#CustomObjectMapper()}
 *
 * @author sunhao([email protected])
 * @version 1.0 2016/11/3 下午2:56
 */
public class EnumDeserializer extends JsonDeserializer {
    @Override
    @SuppressWarnings("unchecked")
    public Enum deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
        String value = p.getValueAsString();
        if (StringUtils.isBlank(value)) {
            return null;
        }

        Class clazz = getType(p);
        if (clazz == null) {
            return null;
        }

        Enum result;
        try {
            result = Enum.valueOf(clazz, value);
        } catch (Exception e) {
            result = null;
        }

        if (result != null) {
            return result;
        }

        for (Enum em : clazz.getEnumConstants()) {
            Codeable codeable = (Codeable) em;

            if (codeable.getCode().equals(value)) {
                result = em;
                break;
            }
        }

        return result;
    }

    @Override
    public Class handledType() {
        return Enum.class;
    }

    @SuppressWarnings("unchecked")
    private > Class getType(JsonParser p) throws IOException {
        Object object = p.getCurrentValue();
        Class clazz = object.getClass();
        String fieldName = p.getCurrentName();

        Class type;
        try {
            type = clazz.getDeclaredField(fieldName).getType();
        } catch (NoSuchFieldException e) {
            type = null;
        }

        if (support(type)) {
            return (Class) type;
        }

        return null;
    }

    private boolean support(Class clazz) {
        return clazz != null && Enum.class.isAssignableFrom(clazz) && Enum.class.isAssignableFrom(clazz);
    }
}