package org.jboss.resteasy.plugins.providers;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.CompletionStage;

import jakarta.ws.rs.Consumes;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.MultivaluedMap;
import jakarta.ws.rs.ext.MessageBodyReader;
import jakarta.ws.rs.ext.Provider;

import org.jboss.resteasy.spi.AsyncMessageBodyWriter;
import org.jboss.resteasy.spi.AsyncOutputStream;
import org.jboss.resteasy.util.MediaTypeHelper;
import org.jboss.resteasy.util.NoContent;

/**
 * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
 * @version $Revision: 1 $
 */
@Provider
@Produces("*/*")
@Consumes("*/*")
public class StringTextStar implements MessageBodyReader<String>, AsyncMessageBodyWriter<String> {
    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return String.class.equals(type);
    }

    public String readFrom(Class<String> type,
            Type genericType,
            Annotation[] annotations,
            MediaType mediaType,
            MultivaluedMap<String, String> httpHeaders,
            InputStream entityStream) throws IOException {
        if (NoContent.isContentLengthZero(httpHeaders))
            return "";
        return ProviderHelper.readString(entityStream, mediaType);
    }

    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return String.class.equals(type) && !MediaTypeHelper.isBlacklisted(mediaType);
    }

    public long getSize(String o, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return -1;
    }

    public void writeTo(String o,
            Class<?> type,
            Type genericType,
            Annotation[] annotations,
            MediaType mediaType,
            MultivaluedMap<String, Object> httpHeaders,
            OutputStream entityStream) throws IOException {
        String charset = mediaType.getParameters().get("charset");
        if (charset == null)
            entityStream.write(o.getBytes(StandardCharsets.UTF_8));
        else
            entityStream.write(o.getBytes(charset));

    }

    @Override
    public CompletionStage<Void> asyncWriteTo(String o, Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap<String, Object> httpHeaders,
            AsyncOutputStream entityStream) {
        String charset = mediaType.getParameters().get("charset");
        if (charset == null)
            return entityStream.asyncWrite(o.getBytes(StandardCharsets.UTF_8));
        else {
            try {
                return entityStream.asyncWrite(o.getBytes(charset));
            } catch (UnsupportedEncodingException e) {
                return ProviderHelper.completedException(e);
            }
        }
    }
}
