/*
 * FreeRTOS V202212.00
 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * https://www.FreeRTOS.org
 * https://github.com/FreeRTOS
 *
 */

/*
 * Some code which is common to TCP servers like HTTP and FTP
 */

#ifndef FREERTOS_SERVER_PRIVATE_H
#define FREERTOS_SERVER_PRIVATE_H

#define FREERTOS_NO_SOCKET    NULL

/* FreeRTOS+FAT */
#include "ff_stdio.h"

/* Each HTTP server has 1, at most 2 sockets */
#define HTTP_SOCKET_COUNT    2

/*
 * ipconfigTCP_COMMAND_BUFFER_SIZE sets the size of:
 *     pcCommandBuffer': a buffer to receive and send TCP commands
 *
 * ipconfigTCP_FILE_BUFFER_SIZE sets the size of:
 *     pcFileBuffer'   : a buffer to access the file system: read or write data.
 *
 * The buffers are both used for FTP as well as HTTP.
 */

#ifndef ipconfigTCP_COMMAND_BUFFER_SIZE
    #define ipconfigTCP_COMMAND_BUFFER_SIZE    ( 2048 )
#endif

#ifndef ipconfigTCP_FILE_BUFFER_SIZE
    #define ipconfigTCP_FILE_BUFFER_SIZE    ( 2048 )
#endif

struct xTCP_CLIENT;

typedef BaseType_t ( * FTCPWorkFunction ) ( struct xTCP_CLIENT * /* pxClient */ );
typedef void ( * FTCPDeleteFunction ) ( struct xTCP_CLIENT * /* pxClient */ );

#define TCP_CLIENT_FIELDS               \
    enum eSERVER_TYPE eType;            \
    struct xTCP_SERVER * pxParent;      \
    Socket_t xSocket;                   \
    const char * pcRootDir;             \
    FTCPWorkFunction fWorkFunction;     \
    FTCPDeleteFunction fDeleteFunction; \
    struct xTCP_CLIENT * pxNextClient

typedef struct xTCP_CLIENT
{
    /* This define contains fields which must come first within each of the client structs */
    TCP_CLIENT_FIELDS;
    /* --- Keep at the top  --- */
} TCPClient_t;

struct xHTTP_CLIENT
{
    /* This define contains fields which must come first within each of the client structs */
    TCP_CLIENT_FIELDS;
    /* --- Keep at the top  --- */

    const char * pcUrlData;
    const char * pcRestData;
    char pcCurrentFilename[ ffconfigMAX_FILENAME ];
    size_t uxBytesLeft;
    FF_FILE * pxFileHandle;
    union
    {
        struct
        {
            uint32_t
                bReplySent : 1;
        };
        uint32_t ulFlags;
    }
    bits;
};

typedef struct xHTTP_CLIENT HTTPClient_t;

struct xFTP_CLIENT
{
    /* This define contains fields which must come first within each of the client structs */
    TCP_CLIENT_FIELDS;
    /* --- Keep at the top  --- */

    uint32_t ulRestartOffset;
    uint32_t ulRecvBytes;
    size_t uxBytesLeft; /* Bytes left to send */
    uint32_t ulClientIP;
    TickType_t xStartTime;
    uint16_t usClientPort;
    Socket_t xTransferSocket;
    BaseType_t xTransType;
    BaseType_t xDirCount;
    FF_FindData_t xFindData;
    FF_FILE * pxReadHandle;
    FF_FILE * pxWriteHandle;
    char pcCurrentDir[ ffconfigMAX_FILENAME ];
    char pcFileName[ ffconfigMAX_FILENAME ];
    char pcConnectionAck[ 128 ];
    char pcClientAck[ 128 ];
    union
    {
        struct
        {
            uint32_t
                bHelloSent : 1,
                bLoggedIn : 1,
                bStatusUser : 1,
                bInRename : 1,
                bReadOnly : 1;
        };
        uint32_t ulFTPFlags;
    }
    bits;
    union
    {
        struct
        {
            uint32_t
                bIsListen : 1,        /* pdTRUE for passive data connections (using list()). */
                bDirHasEntry : 1,     /* pdTRUE if ff_findfirst() was successful. */
                bClientConnected : 1, /* pdTRUE after connect() or accept() has succeeded. */
                bEmptyFile : 1,       /* pdTRUE if a connection-without-data was received. */
                bHadError : 1;        /* pdTRUE if a transfer got aborted because of an error. */
        };
        uint32_t ulConnFlags;
    }
    bits1;
};

typedef struct xFTP_CLIENT FTPClient_t;

BaseType_t xHTTPClientWork( TCPClient_t * pxClient );
BaseType_t xFTPClientWork( TCPClient_t * pxClient );

void vHTTPClientDelete( TCPClient_t * pxClient );
void vFTPClientDelete( TCPClient_t * pxClient );

BaseType_t xMakeAbsolute( struct xFTP_CLIENT * pxClient,
                          char * pcBuffer,
                          BaseType_t xBufferLength,
                          const char * pcFileName );
BaseType_t xMakeRelative( FTPClient_t * pxClient,
                          char * pcBuffer,
                          BaseType_t xBufferLength,
                          const char * pcFileName );

struct xTCP_SERVER
{
    SocketSet_t xSocketSet;
    /* A buffer to receive and send TCP commands, either HTTP of FTP. */
    char pcCommandBuffer[ ipconfigTCP_COMMAND_BUFFER_SIZE ];
    /* A buffer to access the file system: read or write data. */
    char pcFileBuffer[ ipconfigTCP_FILE_BUFFER_SIZE ];

    #if ( ipconfigUSE_FTP != 0 )
        char pcNewDir[ ffconfigMAX_FILENAME ];
    #endif
    #if ( ipconfigUSE_HTTP != 0 )
        char pcContentsType[ 40 ];  /* Space for the msg: "text/javascript" */
        char pcExtraContents[ 40 ]; /* Space for the msg: "Content-Length: 346500" */
    #endif
    BaseType_t xServerCount;
    TCPClient_t * pxClients;
    struct xSERVER
    {
        enum eSERVER_TYPE eType; /* eSERVER_HTTP | eSERVER_FTP */
        const char * pcRootDir;
        Socket_t xSocket;
    }
    xServers[ 1 ];
};

#endif /* FREERTOS_SERVER_PRIVATE_H */