package th.co.muangthai.endrprint.util;

import com.google.gson.*;

import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Created by IntelliJ IDEA.
 * User: ZIZU
 * Date: 5/16/13
 * Time: 9:21 AM
 * To change this template use File | Settings | File Templates.
 */
public class JsonUtil {

    private static Gson gson;

    public static Gson getGsonInstance()
    {

        if (gson == null) {
            GsonBuilder gsonBuilder = new GsonBuilder();
            gsonBuilder.registerTypeAdapter(BigDecimal.class, new JsonDeserializer<BigDecimal>() {

                @Override
                public BigDecimal deserialize(final JsonElement json, final Type typeOfT, final JsonDeserializationContext context)
                        throws JsonParseException {
                    try {

                        String value  = json.getAsString();

                        if (value != null){
                            value = value.replace("\\r","");
                        }

                        return new BigDecimal(value);
                    } catch (Exception e) {
                        return null;
                    }
                }


            });

            gsonBuilder.registerTypeAdapter(Integer.class, new JsonDeserializer<Integer>() {

                @Override
                public Integer deserialize(final JsonElement json, final Type typeOfT, final JsonDeserializationContext context)
                        throws JsonParseException {
                    try {

                        String value  = json.getAsString();

                        if (value != null){
                            value = value.replace("\\r","");
                        }

                        return new Integer(value);
                    } catch (Exception e) {
                        return null;
                    }
                }
            });

            gsonBuilder.registerTypeAdapter(Date.class, new JsonDeserializer<Date>() {
                SimpleDateFormat df = new SimpleDateFormat("dd/MM/yyyy");

                @Override
                public Date deserialize(final JsonElement json, final Type typeOfT, final JsonDeserializationContext context)
                        throws JsonParseException {
//                    public Date deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
                    if (VSMUtil.isEmpty(json.getAsString()))
                        return null;


//                    return new Date(Long.parseLong(json.getAsString()));
                    try {
                        return df.parse(json.getAsString());
                    } catch (ParseException e) {
                        throw new RuntimeException(e);
                    }

                }
            });

            gsonBuilder.setDateFormat("dd/MM/yyyy");

            gson = gsonBuilder.create();
        }

        return gson;
    }
}