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package io.proximax.utils;

import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.charset.StandardCharsets;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

/**
 * The utility class for handling JSON serialization and deserialization
 */
public class JsonUtils {

	private static Gson gson;

	/**
	 * Construct an instance of this utility class
	 */
	private JsonUtils() {
	}

	/**
	 * Initializes the current Gson object if null and returns it. The Gson
	 * object has custom adapters to manage datatypes according to Facebook
	 * formats.
	 * 
	 * @return the current instance of Gson.
	 */
	private static Gson getGson() {
		if (gson == null) {
			// Creates the Gson object which will manage the information
			// received
			GsonBuilder builder = new GsonBuilder();

			gson = builder.create();
		}
		return gson;
	}

   /**
    * Read a JSON into an object of given type
    *
    * @param 
    *          the generic type
    * @param json
    *            the string from which the object is to be deserialized.
    * @param targetType
    *            the target type
    * @return an object of type T from the string. Returns null if json is
    *         null.
    * @see Gson#fromJson(String, Class)
    */
   public static  T fromJson(String json, Class targetType) {
      return getGson().fromJson(json, targetType);
   }

   /**
    * Read a JSON into an object of given type
    *
    * @param 
    *          the generic type
    * @param is
    *            the input stream from which the object is to be deserialized.
    * @param targetType
    *            the target type
    * @return an object of type T from the string. Returns null if json is
    *         null.
    * @see Gson#fromJson(String, Class)
    */
   public static  T fromJson(InputStream is, Class targetType) {
      Reader reader = new InputStreamReader(is, StandardCharsets.UTF_8);
      return getGson().fromJson(reader, targetType);
   }

	/**
	 * Create a JSON representation of the object
	 *
	 * @param source
	 *            the object for which Json representation is to be created
	 *            setting for Gson .
	 * @return Json representation of src.
	 * @see Gson#toJson(Object)
	 */
	public static String toJson(Object source) {
		return getGson().toJson(source);
	}

}