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/******************************************************************************* 
 * Copyright (c) 2016-2018 Red Hat, Inc. 
 * Distributed under license by Red Hat, Inc. All rights reserved. 
 * This program is made available under the terms of the 
 * Eclipse Public License v1.0 which accompanies this distribution, 
 * and is available at http://www.eclipse.org/legal/epl-v10.html 
 * 
 * Contributors: 
 * Red Hat, Inc. - initial API and implementation 
 ******************************************************************************/

package com.openshift.internal.restclient.capability.resources;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.openshift.internal.restclient.DefaultClient;
import com.openshift.internal.restclient.URLBuilder;
import com.openshift.internal.restclient.okhttp.OpenShiftRequestBuilder;
import com.openshift.internal.restclient.okhttp.ResponseCodeInterceptor;
import com.openshift.restclient.IApiTypeMapper;
import com.openshift.restclient.IClient;
import com.openshift.restclient.UnsupportedEndpointException;
import com.openshift.restclient.capability.IStoppable;
import com.openshift.restclient.capability.resources.IPodLogRetrievalAsync;
import com.openshift.restclient.http.IHttpConstants;
import com.openshift.restclient.model.IPod;

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.WebSocket;
import okhttp3.WebSocketListener;
import okio.ByteString;

/**
 * Impl of Pod log retrieval using websocket
 *
 */
public class PodLogRetrievalAsync implements IPodLogRetrievalAsync {

    private static final Logger LOG = LoggerFactory.getLogger(PodLogRetrievalAsync.class);
    private static final String CAPABILITY = "log";
    private final IPod pod;
    private final DefaultClient client;
    private final IApiTypeMapper mapper;

    public PodLogRetrievalAsync(IPod pod, IClient client) {
        this.pod = pod;
        this.client = client.adapt(DefaultClient.class);
        this.mapper = client.adapt(IApiTypeMapper.class);
    }

    @Override
    public boolean isSupported() {
        if (client != null && mapper != null) {
            try {
                return mapper.getEndpointFor(pod.getApiVersion(), pod.getKind()).isSupported(CAPABILITY);
            } catch (UnsupportedEndpointException e) {
                // endpoint not found for version/kind
            }
        }
        return false;
    }

    @Override
    public String getName() {
        return PodLogRetrievalAsync.class.getSimpleName();
    }

    @Override
    public IStoppable start(IPodLogListener listener) {
        return start(listener, null);
    }

    @Override
    public IStoppable start(IPodLogListener listener, Options options) {
        Map parameters = options != null ? options.getMap() : new HashMap<>();
        PodLogListenerAdapter adapter = new PodLogListenerAdapter(listener);

        OkHttpClient okClient = client.adapt(OkHttpClient.class);
        final String endpoint = new URLBuilder(client.getBaseURL(), mapper).kind(pod.getKind())
                .namespace(pod.getNamespaceName()).name(pod.getName()).subresource(CAPABILITY).addParameters(parameters)
                .websocket();
        Request request = new OpenShiftRequestBuilder()
                .url(endpoint)
                .acceptJson()
                .authorization(client.getAuthorizationContext())
                .tag(new ResponseCodeInterceptor.Ignore() {})
                .build();
        okClient.newWebSocket(request, adapter);
        return adapter;
    }

    static class PodLogListenerAdapter extends WebSocketListener implements IStoppable {

        private final IPodLogListener listener;
        private WebSocket wsClient;
        private AtomicBoolean open = new AtomicBoolean(false);

        public PodLogListenerAdapter(IPodLogListener listener) {
            this.listener = listener;
        }

        @Override
        public void stop() {
            try {
                if (open.get()) {
                    wsClient.close(IHttpConstants.STATUS_NORMAL_STOP, "Client asking to stop.");
                }
            } catch (Exception e) {
                LOG.debug("Unable to stop the watch client", e);
            } finally {
                wsClient = null;
            }
        }

        @Override
        public void onOpen(WebSocket webSocket, Response response) {
            if (open.compareAndSet(false, true)) {
                wsClient = webSocket;
                listener.onOpen();
            }
        }

        @Override
        public void onClosing(WebSocket socket, int code, String reason) {
            if (open.compareAndSet(true, false)) {
                listener.onClose(code, reason);
            }
        }

        @Override
        public void onMessage(WebSocket socket, String message) {
            listener.onMessage(message);
        }

        @Override
        public void onMessage(WebSocket webSocket, ByteString bytes) {
            listener.onMessage(bytes.utf8());
        }

        @Override
        public void onFailure(WebSocket socket, Throwable t, Response response) {
            listener.onFailure(t);
        }

    }
}