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package io.neow3j.protocol;

import io.neow3j.protocol.core.Request;
import io.neow3j.protocol.core.Response;
import io.neow3j.protocol.notifications.Notification;
import io.neow3j.utils.Async;
import com.fasterxml.jackson.databind.ObjectMapper;
import rx.Observable;

import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.CompletableFuture;

/**
 * Base service implementation.
 */
public abstract class Service implements Neow3jService {

    protected final ObjectMapper objectMapper;

    public Service(boolean includeRawResponses) {
        objectMapper = ObjectMapperFactory.getObjectMapper(includeRawResponses);
    }

    protected abstract InputStream performIO(String payload) throws IOException;

    @Override
    public  T send(
            Request request, Class responseType) throws IOException {
        String payload = objectMapper.writeValueAsString(request);

        try (InputStream result = performIO(payload)) {
            if (result != null) {
                return objectMapper.readValue(result, responseType);
            } else {
                return null;
            }
        }
    }

    @Override
    public  CompletableFuture sendAsync(
            Request jsonRpc20Request, Class responseType) {
        return Async.run(() -> send(jsonRpc20Request, responseType));
    }

    @Override
    public > Observable subscribe(
            Request request,
            String unsubscribeMethod,
            Class responseType) {
        throw new UnsupportedOperationException(
                String.format(
                        "Service %s does not support subscriptions",
                        this.getClass().getSimpleName()));
    }
}