/*
 * Copyright (C) 2019 Sony Interactive Entertainment Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#if ENABLE(REMOTE_INSPECTOR)

#include "RemoteInspectorSocket.h"

#include <wtf/Condition.h>
#include <wtf/Function.h>
#include <wtf/HashMap.h>
#include <wtf/Lock.h>
#include <wtf/Threading.h>
#include <wtf/Vector.h>

namespace Inspector {

class RemoteInspectorSocketEndpoint {
    WTF_MAKE_FAST_ALLOCATED;
public:
    class Client {
    public:
        virtual void didReceive(ConnectionID, Vector<uint8_t>&&) = 0;
        virtual void didClose(ConnectionID) = 0;
    };

    class Listener {
    public:
        virtual bool didAccept(ConnectionID acceptedID, ConnectionID listenerID, Socket::Domain) = 0;
        virtual void didClose(ConnectionID) = 0;
    };

    static RemoteInspectorSocketEndpoint& singleton();

    RemoteInspectorSocketEndpoint();
    ~RemoteInspectorSocketEndpoint();

    Optional<ConnectionID> connectInet(const char* serverAddr, uint16_t serverPort, Client&);
    Optional<ConnectionID> listenInet(const char* address, uint16_t port, Listener&, Client&);
    void invalidateClient(Client&);
    void invalidateListener(Listener&);

    void send(ConnectionID, const uint8_t* data, size_t);

    Optional<ConnectionID> createClient(PlatformSocketType, Client&);
    Optional<ConnectionID> createListener(PlatformSocketType, Listener&, Client&);

    Optional<uint16_t> getPort(ConnectionID) const;

protected:
    struct Connection {
        WTF_MAKE_STRUCT_FAST_ALLOCATED;
        explicit Connection(Client& client)
            : client(client)
        {
        }

        ConnectionID id;
        Vector<uint8_t> sendBuffer;
        PlatformSocketType socket { INVALID_SOCKET_VALUE };
        PollingDescriptor poll;
        Client& client;
        Listener* listener { };
    };

    ConnectionID generateConnectionID();
    std::unique_ptr<Connection> makeConnection(PlatformSocketType, Client&);

    void recvIfEnabled(ConnectionID);
    void sendIfEnabled(ConnectionID);
    void workerThread();
    void wakeupWorkerThread();
    void acceptInetSocketIfEnabled(ConnectionID);
    bool isListening(ConnectionID);

    mutable Lock m_connectionsLock;
    HashMap<ConnectionID, std::unique_ptr<Connection>> m_connections;
    HashMap<ConnectionID, std::unique_ptr<Connection>> m_listeners;

    PlatformSocketType m_wakeupSendSocket { INVALID_SOCKET_VALUE };
    PlatformSocketType m_wakeupReceiveSocket { INVALID_SOCKET_VALUE };

    RefPtr<Thread> m_workerThread;
    std::atomic<bool> m_shouldAbortWorkerThread { false };
};

} // namespace Inspector

#endif // ENABLE(REMOTE_INSPECTOR)