package isa.qa.utils;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class JsonUtils {

    private final static ObjectMapper objectMapper = new ObjectMapper();

    /**
     * javaBean,list,array convert to json string
     */
    public static String objToJson(Object obj) throws Exception {
        return objectMapper.writeValueAsString(obj);
    }

    /**
     * json string convert to javaBean
     */
    public static <T> T jsonToPojo(String jsonStr, Class<T> clazz)
            throws Exception {
        return objectMapper.readValue(jsonStr, clazz);
    }

    /**
     * json string convert to map
     */
    public static <T> Map<String, Object> jsonToMap(String jsonStr)
            throws Exception {
        return objectMapper.readValue(jsonStr, Map.class);
    }

    /**
     * json string convert to map with javaBean
     */
    public static <T> Map<String, T> jsonToMap(String jsonStr, Class<T> clazz)
            throws Exception {
        Map<String, Map<String, Object>> map = objectMapper.readValue(jsonStr,
                new TypeReference<Map<String, T>>() {
                });
        Map<String, T> result = new HashMap<String, T>();
        for (Map.Entry<String, Map<String, Object>> entry : map.entrySet()) {
            result.put(entry.getKey(), mapToPojo(entry.getValue(), clazz));
        }
        return result;
    }

    /**
     * json array string convert to list with javaBean
     */
    public static <T> List<T> jsonToList(String jsonArrayStr, Class<T> clazz)
            throws Exception {
        List<Map<String, Object>> list = objectMapper.readValue(jsonArrayStr,
                new TypeReference<List<T>>() {
                });
        List<T> result = new ArrayList<T>();
        for (Map<String, Object> map : list) {
            result.add(mapToPojo(map, clazz));
        }
        return result;
    }

    /**
     * map convert to javaBean
     */
    public static <T> T mapToPojo(Map map, Class<T> clazz) {
        return objectMapper.convertValue(map, clazz);
    }
}