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/* Copyright (c) 2005-2018 Rexx Language Association. All rights reserved.    */
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/* the terms of the Common Public License v1.0 which accompanies this         */
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/*----------------------------------------------------------------------------*/

#ifndef CSStream_Included
#define CSStream_Included

// Client Server error codes
typedef enum
{
    CSERROR_OK = 0,
    CSERROR_CONNX_EXISTS,
    CSERROR_CONNX_FAILED,
    CSERROR_IO_FAILED,
    CSERROR_OPEN_FAILED,
    CSERROR_HOSTNAME_PORT,
    CSERROR_INTERNAL,
    CSERROR_ALREADY_CONNECTED,
    CSERROR_UNKNOWN
} CSErrorCodeT;


/**
 * Base class for a client server connection. This manages the interface,
 * while platform-specific overrides manage the communication details.
 */
class ApiConnection
{
public:
    inline ApiConnection() : errcode(CSERROR_OK), messageBuffer(NULL) { }
    virtual ~ApiConnection() { disconnect(); if (messageBuffer != NULL) { free(messageBuffer); } }

    inline CSErrorCodeT getError()
    {
        return errcode;
    };
    inline bool isClean()
    {
        return errcode == CSERROR_OK;
    }

    char *getMessageBuffer(size_t size);
    void returnMessageBuffer(void *);

    // methods that concrete implementations must override
    virtual bool read(void *buf, size_t bufsize, size_t *bytesread) = 0;
    virtual bool write(void *buf, size_t bufsize, size_t *byteswritten) = 0;
    virtual bool write(void *buf, size_t bufsize, void*buf2, size_t buf2size, size_t *byteswritten) = 0;
    virtual bool disconnect() { return false; };

protected:
    enum
    {
        // somewhat arbitrary.  Should be large enough for "normal requests"
        MAX_CACHED_BUFFER = 4096
    };

    CSErrorCodeT errcode;  // error status
    char *messageBuffer;   // a buffer for message sending
};


/**
 * Base class for a server connection manager that accepts
 * incoming connections from clients. This manages the
 * interface, while platform-specific overrides manage the
 * communication details.
 */
class ServerConnectionManager
{
public:
    inline ServerConnectionManager() : errcode(CSERROR_OK) { }
    virtual ~ServerConnectionManager() { disconnect(); }

    inline CSErrorCodeT getError()
    {
        return errcode;
    };
    inline bool isClean()
    {
        return errcode == CSERROR_OK;
    }

    virtual bool disconnect() { return false; };
    virtual ApiConnection *acceptConnection() = 0;

protected:
    CSErrorCodeT errcode;  // error status
};

#endif