package cactusServer.utils;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.inject.Singleton;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;

import net.arnx.jsonic.JSON;

@Provider
@Produces(MediaType.APPLICATION_JSON)
@Singleton
public class JSONProvider implements MessageBodyWriter<Object> {
	@Override
	public long getSize(Object obj, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
		try {
			return JSON.encode(obj).getBytes("UTF-8").length;
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	@Override
	public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
		return true;
	}

	@Override
	public void writeTo(Object obj, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType,
			MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
			throws IOException, WebApplicationException {
		System.out.println("JSONProvider#writeTo()を開始");
		JSON.encode(obj, entityStream);
		System.out.println("JSONProvider#writeTo()を終了");
	}
}