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package com.baidu.haotianjing.core.utils;

import com.baidu.haotianjing.core.exception.RiskSdkException;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;

import java.io.IOException;
import java.io.StringWriter;
import java.text.SimpleDateFormat;

public class JacksonUtils {

    private static JsonFactory jsonFactory = new JsonFactory();
    private static ObjectMapper objectMapper = createObjectMapper();
    private static final String DATE_PATTERN = "yyyyMMddHHmmss";

    /**
     * 创建一个自定义的JSON ObjectMapper
     */
    private static ObjectMapper createObjectMapper() {

        ObjectMapper objectMapper = new ObjectMapper();

        objectMapper.setDateFormat(new SimpleDateFormat(DATE_PATTERN));
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        objectMapper.configure(SerializationFeature.INDENT_OUTPUT, false);
        objectMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true);
        objectMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
        objectMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
        objectMapper.configure(JsonParser.Feature.ALLOW_BACKSLASH_ESCAPING_ANY_CHARACTER, true);

        return objectMapper;
    }

    /**
     * 将对象转换为JSON字符串
     */
    public static  String toJson(T value) throws RiskSdkException {
        if (value == null) {
            return null;
        }
        StringWriter sw = new StringWriter();
        JsonGenerator gen = null;
        try {
            gen = jsonFactory.createGenerator(sw);
            objectMapper.writeValue(gen, value);
            return sw.toString();
        } catch (IOException e) {
            throw new RiskSdkException("object to json exp. object: " + value, e);
        } finally {
            if (gen != null) {
                try {
                    gen.close();
                } catch (IOException e) {
                    /** ignore */
                }
            }
        }
    }

    /**
     * 将JSON字符串转换为指定对象
     */
    @SuppressWarnings("unchecked")
    public static  T toObject(String jsonString, Class valueType, Class... itemTypes) throws Exception {
        if (null == jsonString || jsonString.length() < 1) {
            return null;
        }
        // 返回值加强制转换是因为scmpf编译机JDK版本jdk1.6.0_20的BUG，编译时会出错，在jdk1.6.0_25之后已修复
        try {
            if (itemTypes.length == 0) {
                // 非集合类型
                return (T) objectMapper.readValue(jsonString, valueType);
            } else {
                // 集合类型, 如List,Map
                JavaType javaType = objectMapper.getTypeFactory()
                        .constructParametrizedType(valueType, valueType, itemTypes);
                return (T) objectMapper.readValue(jsonString, javaType);
            }
        } catch (Exception e) {
            throw new RiskSdkException("json to object exp. json: " + jsonString, e);
        }
    }
}