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//
//  ========================================================================
//  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.http2.client;

import java.io.IOException;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.Executor;

import org.eclipse.jetty.http2.FlowControlStrategy;
import org.eclipse.jetty.http2.HTTP2Connection;
import org.eclipse.jetty.http2.ISession;
import org.eclipse.jetty.http2.api.Session;
import org.eclipse.jetty.http2.frames.PrefaceFrame;
import org.eclipse.jetty.http2.frames.SettingsFrame;
import org.eclipse.jetty.http2.frames.WindowUpdateFrame;
import org.eclipse.jetty.http2.generator.Generator;
import org.eclipse.jetty.http2.parser.Parser;
import org.eclipse.jetty.io.ByteBufferPool;
import org.eclipse.jetty.io.ClientConnectionFactory;
import org.eclipse.jetty.io.Connection;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.util.Callback;
import org.eclipse.jetty.util.Promise;
import org.eclipse.jetty.util.component.LifeCycle;
import org.eclipse.jetty.util.thread.ExecutionStrategy;
import org.eclipse.jetty.util.thread.Scheduler;

public class HTTP2ClientConnectionFactory implements ClientConnectionFactory
{
    public static final String CLIENT_CONTEXT_KEY = "http2.client";
    public static final String BYTE_BUFFER_POOL_CONTEXT_KEY = "http2.client.byteBufferPool";
    public static final String EXECUTOR_CONTEXT_KEY = "http2.client.executor";
    public static final String SCHEDULER_CONTEXT_KEY = "http2.client.scheduler";
    public static final String SESSION_LISTENER_CONTEXT_KEY = "http2.client.sessionListener";
    public static final String SESSION_PROMISE_CONTEXT_KEY = "http2.client.sessionPromise";

    private final Connection.Listener connectionListener = new ConnectionListener();
    private int initialSessionRecvWindow = FlowControlStrategy.DEFAULT_WINDOW_SIZE;

    @Override
    public Connection newConnection(EndPoint endPoint, Map context) throws IOException
    {
        HTTP2Client client = (HTTP2Client)context.get(CLIENT_CONTEXT_KEY);
        ByteBufferPool byteBufferPool = (ByteBufferPool)context.get(BYTE_BUFFER_POOL_CONTEXT_KEY);
        Executor executor = (Executor)context.get(EXECUTOR_CONTEXT_KEY);
        Scheduler scheduler = (Scheduler)context.get(SCHEDULER_CONTEXT_KEY);
        Session.Listener listener = (Session.Listener)context.get(SESSION_LISTENER_CONTEXT_KEY);
        @SuppressWarnings("unchecked")
        Promise promise = (Promise)context.get(SESSION_PROMISE_CONTEXT_KEY);

        Generator generator = new Generator(byteBufferPool);
        FlowControlStrategy flowControl = newFlowControlStrategy();
        if (flowControl == null)
            flowControl = client.getFlowControlStrategyFactory().newFlowControlStrategy();
        HTTP2ClientSession session = new HTTP2ClientSession(scheduler, endPoint, generator, listener, flowControl);
        Parser parser = new Parser(byteBufferPool, session, 4096, 8192);
        HTTP2ClientConnection connection = new HTTP2ClientConnection(client, byteBufferPool, executor, endPoint,
                parser, session, client.getInputBufferSize(), client.getExecutionStrategyFactory(), promise, listener);
        connection.addListener(connectionListener);
        return connection;
    }

    /**
     * @deprecated use {@link HTTP2Client#setFlowControlStrategyFactory(FlowControlStrategy.Factory)} instead
     */
    @Deprecated
    protected FlowControlStrategy newFlowControlStrategy()
    {
        return null;
    }

    /**
     * @deprecated use {@link HTTP2Client#getInitialSessionRecvWindow()} instead
     */
    @Deprecated
    public int getInitialSessionRecvWindow()
    {
        return initialSessionRecvWindow;
    }

    /**
     * @deprecated use {@link HTTP2Client#setInitialSessionRecvWindow(int)} instead
     */
    @Deprecated
    public void setInitialSessionRecvWindow(int initialSessionRecvWindow)
    {
        this.initialSessionRecvWindow = initialSessionRecvWindow;
    }

    private class HTTP2ClientConnection extends HTTP2Connection implements Callback
    {
        private final HTTP2Client client;
        private final Promise promise;
        private final Session.Listener listener;

        private HTTP2ClientConnection(HTTP2Client client, ByteBufferPool byteBufferPool, Executor executor, EndPoint endpoint, Parser parser, ISession session, int bufferSize, ExecutionStrategy.Factory executionFactory, Promise promise, Session.Listener listener)
        {
            super(byteBufferPool, executor, endpoint, parser, session, bufferSize, executionFactory);
            this.client = client;
            this.promise = promise;
            this.listener = listener;
        }

        @Override
        public void onOpen()
        {
            Map settings = listener.onPreface(getSession());
            if (settings == null)
                settings = Collections.emptyMap();

            PrefaceFrame prefaceFrame = new PrefaceFrame();
            SettingsFrame settingsFrame = new SettingsFrame(settings, false);

            ISession session = getSession();

            int sessionRecv = client.getInitialSessionRecvWindow();
            if (sessionRecv == FlowControlStrategy.DEFAULT_WINDOW_SIZE)
                sessionRecv = initialSessionRecvWindow;

            int windowDelta = sessionRecv - FlowControlStrategy.DEFAULT_WINDOW_SIZE;
            if (windowDelta > 0)
            {
                session.updateRecvWindow(windowDelta);
                session.frames(null, this, prefaceFrame, settingsFrame, new WindowUpdateFrame(0, windowDelta));
            }
            else
            {
                session.frames(null, this, prefaceFrame, settingsFrame);
            }
            // Only start reading from server after we have sent the client preface,
            // otherwise we risk to read the server preface (a SETTINGS frame) and
            // reply to that before we have the chance to send the client preface.
            super.onOpen();
        }

        @Override
        public void succeeded()
        {
            promise.succeeded(getSession());
        }

        @Override
        public void failed(Throwable x)
        {
            close();
            promise.failed(x);
        }
    }

    private class ConnectionListener implements Connection.Listener
    {
        @Override
        public void onOpened(Connection connection)
        {
            HTTP2ClientConnection http2Connection = (HTTP2ClientConnection)connection;
            http2Connection.client.addManaged((LifeCycle)http2Connection.getSession());
        }

        @Override
        public void onClosed(Connection connection)
        {
            HTTP2ClientConnection http2Connection = (HTTP2ClientConnection)connection;
            http2Connection.client.removeBean(http2Connection.getSession());
        }
    }
}