/* -*- c++ -*- */
/*
 * Copyright 2012 Hoernchen <la@tfc-server.de>
 * Copyright 2012 Dimitri Stolnikov <horiz0n@gmx.net>
 *
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 *
 * GNU Radio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */
//#define HAVE_WINDOWS_H


#include <rtl_tcp_source_f.h>
#include <gr_io_signature.h>
#include <stdexcept>
#include <errno.h>
#include <stdio.h>
#include <string.h>

#ifndef _WIN32
#include <netinet/in.h>
#else
#include <WinSock2.h>
#endif

/* copied from rtl sdr code */
typedef struct { /* structure size must be multiple of 2 bytes */
  char magic[4];
  uint32_t tuner_type;
  uint32_t tuner_gain_count;
} dongle_info_t;

#define USE_SELECT    1  // non-blocking receive on all platforms
#define USE_RCV_TIMEO 0  // non-blocking receive on all but Cygwin
#define SRC_VERBOSE 0
#define SNK_VERBOSE 0

static int is_error( int perr )
{
  // Compare error to posix error code; return nonzero if match.
#if defined(USING_WINSOCK)
#define ENOPROTOOPT 109
  // All codes to be checked for must be defined below
  int werr = WSAGetLastError();
  switch( werr ) {
  case WSAETIMEDOUT:
    return( perr == EAGAIN );
  case WSAENOPROTOOPT:
    return( perr == ENOPROTOOPT );
  default:
    fprintf(stderr,"rtl_tcp_source_f: unknown error %d WS err %d \n", perr, werr );
    throw std::runtime_error("internal error");
  }
  return 0;
#else
  return( perr == errno );
#endif
}

static void report_error( const char *msg1, const char *msg2 )
{
  // Deal with errors, both posix and winsock
#if defined(USING_WINSOCK)
  int werr = WSAGetLastError();
  fprintf(stderr, "%s: winsock error %d\n", msg1, werr );
#else
  perror(msg1);
#endif
  if( msg2 != NULL )
    throw std::runtime_error(msg2);
  return;
}

rtl_tcp_source_f::rtl_tcp_source_f(size_t itemsize,
                                   const char *host,
                                   unsigned short port,
                                   int payload_size,
                                   bool eof,
                                   bool wait)
  : gr_sync_block ("rtl_tcp_source_f",
                   gr_make_io_signature(0, 0, 0),
                   gr_make_io_signature(1, 1, sizeof(float))),
    d_itemsize(itemsize),
    d_payload_size(payload_size),
    d_eof(eof),
    d_wait(wait),
    d_socket(-1),
    d_temp_offset(0)
{
  int ret = 0;
#if defined(USING_WINSOCK) // for Windows (with MinGW)
  // initialize winsock DLL
  WSADATA wsaData;
  int iResult = WSAStartup( MAKEWORD(2,2), &wsaData );
  if( iResult != NO_ERROR ) {
    report_error( "rtl_tcp_source_f WSAStartup", "can't open socket" );
  }
#endif

  // Set up the address stucture for the source address and port numbers
  // Get the source IP address from the host name
  struct addrinfo *ip_src;      // store the source IP address to use
  struct addrinfo hints;
  memset( (void*)&hints, 0, sizeof(hints) );
  hints.ai_family = AF_INET;
  hints.ai_socktype = SOCK_STREAM;
  hints.ai_protocol = IPPROTO_TCP;
  hints.ai_flags = AI_PASSIVE;
  char port_str[12];
  sprintf( port_str, "%d", port );

  // FIXME leaks if report_error throws below
  ret = getaddrinfo( host, port_str, &hints, &ip_src );
  if( ret != 0 )
    report_error("rtl_tcp_source_f/getaddrinfo",
                 "can't initialize source socket" );

  // FIXME leaks if report_error throws below
  d_temp_buff = new unsigned char[d_payload_size];   // allow it to hold up to payload_size bytes
  d_LUT= new float[0xff+1];
  for(int i=0; i <=(0xff);++i){
    d_LUT[i] = (((float)(i&0xff))-127.5f)*(1.0f/128.0f);
  }
  // create socket
  d_socket = socket(ip_src->ai_family, ip_src->ai_socktype,
                    ip_src->ai_protocol);
  if(d_socket == -1) {
    report_error("socket open","can't open socket");
  }

  // Turn on reuse address
  int opt_val = 1;
  if(setsockopt(d_socket, SOL_SOCKET, SO_REUSEADDR, (optval_t)&opt_val, sizeof(int)) == -1) {
    report_error("SO_REUSEADDR","can't set socket option SO_REUSEADDR");
  }

  // Don't wait when shutting down
  linger lngr;
  lngr.l_onoff  = 1;
  lngr.l_linger = 0;
  if(setsockopt(d_socket, SOL_SOCKET, SO_LINGER, (optval_t)&lngr, sizeof(linger)) == -1) {
    if( !is_error(ENOPROTOOPT) ) {  // no SO_LINGER for SOCK_DGRAM on Windows
      report_error("SO_LINGER","can't set socket option SO_LINGER");
    }
  }

#if USE_RCV_TIMEO
  // Set a timeout on the receive function to not block indefinitely
  // This value can (and probably should) be changed
  // Ignored on Cygwin
#if defined(USING_WINSOCK)
  DWORD timeout = 1000;  // milliseconds
#else
  timeval timeout;
  timeout.tv_sec = 1;
  timeout.tv_usec = 0;
#endif
  if(setsockopt(d_socket, SOL_SOCKET, SO_RCVTIMEO, (optval_t)&timeout, sizeof(timeout)) == -1) {
    report_error("SO_RCVTIMEO","can't set socket option SO_RCVTIMEO");
  }
#endif // USE_RCV_TIMEO

  while(connect(d_socket, ip_src->ai_addr, ip_src->ai_addrlen) != 0);
  freeaddrinfo(ip_src);

  int flag = 1;
  setsockopt(d_socket, IPPROTO_TCP, TCP_NODELAY, (char *)&flag,sizeof(flag));

  dongle_info_t dongle_info;
  ret = recv(d_socket, (char*)&dongle_info, sizeof(dongle_info), 0);
  if (sizeof(dongle_info) != ret)
    fprintf(stderr,"failed to read dongle info\n");

  d_tuner_type = RTLSDR_TUNER_UNKNOWN;
  d_tuner_gain_count = 0;
  d_tuner_if_gain_count = 0;

  if (memcmp(dongle_info.magic, "RTL0", 4) == 0)
  {
    d_tuner_type = ntohl(dongle_info.tuner_type);
    d_tuner_gain_count = ntohl(dongle_info.tuner_gain_count);
    if ( RTLSDR_TUNER_E4000 == d_tuner_type )
      d_tuner_if_gain_count = 53;
  }
}

rtl_tcp_source_f_sptr make_rtl_tcp_source_f (size_t itemsize,
                                             const char *ipaddr,
                                             unsigned short port,
                                             int payload_size,
                                             bool eof,
                                             bool wait)
{
  return gnuradio::get_initial_sptr(new rtl_tcp_source_f (
                                      itemsize,
                                      ipaddr,
                                      port,
                                      payload_size,
                                      eof,
                                      wait));
}

rtl_tcp_source_f::~rtl_tcp_source_f ()
{
  delete [] d_temp_buff;

  if (d_socket != -1){
    shutdown(d_socket, SHUT_RDWR);
#if defined(USING_WINSOCK)
    closesocket(d_socket);
#else
    ::close(d_socket);
#endif
    d_socket = -1;
  }

#if defined(USING_WINSOCK) // for Windows (with MinGW)
  // free winsock resources
  WSACleanup();
#endif
}

int rtl_tcp_source_f::work (int noutput_items,
                            gr_vector_const_void_star &input_items,
                            gr_vector_void_star &output_items)
{
  float *out = (float *) output_items[0];
  ssize_t r=0, nbytes=0, bytes_received=0;
  ssize_t total_bytes = (ssize_t)(d_itemsize*noutput_items);

  int bytesleft = noutput_items;
  int index = 0;
  int receivedbytes = 0;
  while(bytesleft > 0) {
    receivedbytes = recv(d_socket, (char*)&d_temp_buff[index], bytesleft, 0);

    if(receivedbytes == -1 && !is_error(EAGAIN)){
      fprintf(stderr, "socket error\n");
      return -1;
    }
    bytesleft -= receivedbytes;
    index += receivedbytes;
  }
  r = noutput_items;

  for(int i=0; i<r; ++i)
    out[i]=d_LUT[*(d_temp_buff+d_temp_offset+i)];

  return r;
}

#ifdef _WIN32
#define __attribute__(x)
#pragma pack(push, 1)
#endif
struct command{
  unsigned char cmd;
  unsigned int param;
}__attribute__((packed));
#ifdef _WIN32
#pragma pack(pop)
#endif

void rtl_tcp_source_f::set_freq(int freq)
{
  struct command cmd = { 0x01, htonl(freq) };
  send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
}

void rtl_tcp_source_f::set_sample_rate(int sample_rate)
{
  struct command cmd = { 0x02, htonl(sample_rate) };
  send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
}

void rtl_tcp_source_f::set_gain_mode(int manual)
{
  struct command cmd = { 0x03, htonl(manual) };
  send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
}

void rtl_tcp_source_f::set_gain(int gain)
{
  struct command cmd = { 0x04, htonl(gain) };
  send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
}

void rtl_tcp_source_f::set_freq_corr(int ppm)
{
  struct command cmd = { 0x05, htonl(ppm) };
  send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
}

void rtl_tcp_source_f::set_if_gain(int stage, int gain)
{
  uint32_t params = stage << 16 | (gain & 0xffff);
  struct command cmd = { 0x06, htonl(params) };
  send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
}

void rtl_tcp_source_f::set_agc_mode(int on)
{
  struct command cmd = { 0x08, htonl(on) };
  send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
}

void rtl_tcp_source_f::set_direct_sampling(int on)
{
  struct command cmd = { 0x09, htonl(on) };
  send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
}

void rtl_tcp_source_f::set_offset_tuning(int on)
{
  struct command cmd = { 0x0a, htonl(on) };
  send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
}