/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.mockup;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.URL;
import java.security.KeyStore;
import java.security.NoSuchAlgorithmException;
import java.util.List;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;

import org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor;
import org.apache.http.impl.nio.reactor.ExceptionEvent;
import org.apache.http.impl.nio.ssl.SSLClientIOEventDispatch;
import org.apache.http.nio.NHttpClientHandler;
import org.apache.http.nio.reactor.IOEventDispatch;
import org.apache.http.nio.reactor.IOReactorExceptionHandler;
import org.apache.http.nio.reactor.IOReactorStatus;
import org.apache.http.nio.reactor.SessionRequest;
import org.apache.http.params.HttpParams;

public class HttpSSLClient {

    private final SSLContext sslcontext;
    private final DefaultConnectingIOReactor ioReactor;
    private final HttpParams params;

    private volatile IOReactorThread thread;

    public HttpSSLClient(final HttpParams params) throws Exception {
        super();
        this.params = params;
        this.sslcontext = createSSLContext();
        this.ioReactor = new DefaultConnectingIOReactor(2, this.params);
    }

    private TrustManagerFactory createTrustManagerFactory() throws NoSuchAlgorithmException {
        String algo = TrustManagerFactory.getDefaultAlgorithm();
        try {
            return TrustManagerFactory.getInstance(algo);
        } catch (NoSuchAlgorithmException ex) {
            return TrustManagerFactory.getInstance("SunX509");
        }
    }

    protected SSLContext createSSLContext() throws Exception {
        ClassLoader cl = getClass().getClassLoader();
        URL url = cl.getResource("test.keystore");
        KeyStore keystore  = KeyStore.getInstance("jks");
        keystore.load(url.openStream(), "nopassword".toCharArray());
        TrustManagerFactory tmfactory = createTrustManagerFactory();
        tmfactory.init(keystore);
        TrustManager[] trustmanagers = tmfactory.getTrustManagers();
        SSLContext sslcontext = SSLContext.getInstance("TLS");
        sslcontext.init(null, trustmanagers, null);
        return sslcontext;
    }

    public HttpParams getParams() {
        return this.params;
    }

    public IOReactorStatus getStatus() {
        return this.ioReactor.getStatus();
    }

    public List<ExceptionEvent> getAuditLog() {
        return this.ioReactor.getAuditLog();
    }

    public void setExceptionHandler(final IOReactorExceptionHandler exceptionHandler) {
        this.ioReactor.setExceptionHandler(exceptionHandler);
    }

    protected IOEventDispatch createIOEventDispatch(
            final NHttpClientHandler clientHandler,
            final SSLContext sslcontext,
            final HttpParams params) {
        return new SSLClientIOEventDispatch(clientHandler, sslcontext, params);
    }

    private void execute(final NHttpClientHandler clientHandler) throws IOException {
        IOEventDispatch ioEventDispatch = createIOEventDispatch(
                clientHandler,
                this.sslcontext,
                this.params);

        this.ioReactor.execute(ioEventDispatch);
    }

    public SessionRequest openConnection(final InetSocketAddress address, final Object attachment) {
        return this.ioReactor.connect(address, null, attachment, null);
    }

    public void start(final NHttpClientHandler clientHandler) {
        this.thread = new IOReactorThread(clientHandler);
        this.thread.start();
    }

    public void join(long timeout) throws InterruptedException {
        if (this.thread != null) {
            this.thread.join(timeout);
        }
    }

    public Exception getException() {
        if (this.thread != null) {
            return this.thread.getException();
        } else {
            return null;
        }
    }

    public void shutdown() throws IOException {
        this.ioReactor.shutdown();
        try {
            if (this.thread != null) {
                this.thread.join(500);
            }
        } catch (InterruptedException ignore) {
        }
    }

    private class IOReactorThread extends Thread {

        private final NHttpClientHandler clientHandler;

        private volatile Exception ex;

        public IOReactorThread(final NHttpClientHandler clientHandler) {
            super();
            this.clientHandler = clientHandler;
        }

        @Override
        public void run() {
            try {
                execute(this.clientHandler);
            } catch (Exception ex) {
                this.ex = ex;
            }
        }

        public Exception getException() {
            return this.ex;
        }

    }

}