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package me.legrange.services.jetty;

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

import jakarta.ws.rs.Consumes;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.WebApplicationException;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.MultivaluedMap;
import jakarta.ws.rs.ext.MessageBodyReader;
import jakarta.ws.rs.ext.MessageBodyWriter;
import jakarta.ws.rs.ext.Provider;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import static me.legrange.log.Log.debug;

@Provider
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public class GsonJerseyProvider implements MessageBodyWriter,
        MessageBodyReader {

    private static final String UTF_8 = "UTF-8";
    private  Gson gson;

    public GsonJerseyProvider() {
    }


    protected Gson getGson() {
        if (gson == null) {
            GsonBuilder builder = new GsonBuilder()
                    .serializeNulls()
                    .setPrettyPrinting()
                    .enableComplexMapKeySerialization();
            gson = builder.create();
            debug("GsonJerseyProvider created");
        }
        return gson;
    }

    @Override
    public boolean isReadable(Class type, Type genericType,
            java.lang.annotation.Annotation[] annotations, MediaType mediaType) {
        return true;
    }

    @Override
    public Object readFrom(Class type, Type genericType,
            Annotation[] annotations, MediaType mediaType,
            MultivaluedMap httpHeaders, InputStream entityStream)
            throws IOException {
        InputStreamReader streamReader = new InputStreamReader(entityStream, UTF_8);
        try {
            return getGson().fromJson(streamReader, genericType);
        } catch (com.google.gson.JsonSyntaxException e) {
            // Log exception
        } finally {
            streamReader.close();
        }
        return null;
    }

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

    @Override
    public long getSize(Object object, Class type, Type genericType,
            Annotation[] annotations, MediaType mediaType) {
        return -1;
    }

    @Override
    public void writeTo(Object object, Class type, Type genericType,
            Annotation[] annotations, MediaType mediaType,
            MultivaluedMap httpHeaders,
            OutputStream entityStream) throws IOException,
            WebApplicationException {
        OutputStreamWriter writer = new OutputStreamWriter(entityStream, UTF_8);
        try {
            getGson().toJson(object, genericType, writer);
        } finally {
            writer.close();
        }
    }
}
    

    

    

            

    

            



    
    






    
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