/*
 * Copyright (C) 2006-2009 Alex Lasnier <alex@fepg.org>
 *
 * This file is part of Radio Info
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "receiver.h"  
#include "tools.h"  
#include "config.h"


///////////////////////////////////////////////////////////////////////////////


cRadioInfoReceiver::cRadioInfoReceiver(int Pid, const cChannel *Channel, cRadioInfoData* Rid) : cReceiver(Channel, -1)
{
  dprint(L_REC, "Receiver : Created.");
  radioInfoData = Rid;
  songId = 0;
  infoVers = 0;
  attachedDevice = NULL;
}


//-----------------------------------------------------------------------------

void cRadioInfoReceiver::Attach(cDevice* device)
{
if (!attachedDevice) 
  {
    attachedDevice = device;
    if (attachedDevice) 
    {
      attachedDevice->AttachReceiver(this);
      dprint(L_REC, "Receiver : Attached.");
    }
  }
}


//-----------------------------------------------------------------------------

void cRadioInfoReceiver::Detach(void)
{
  if (attachedDevice) 
  {
    attachedDevice->Detach(this);
    attachedDevice = NULL;
    dprint(L_REC, "Receiver : Detached.");
  }
}


//-----------------------------------------------------------------------------

#define TS_ADAPT_FIELD_EXISTS 0x20


void cRadioInfoReceiver::Receive(uchar* data, int length) 
{
  int offset = (data[3] & TS_ADAPT_FIELD_EXISTS) ? data[4] + 5 : 4;
  data += offset;
  length -= offset;
  
  if (length < 10) return;
  
  if (data[0] != 0x00 || data[1] != 0xD3 || data[2] != 0xB0) 
  {
    dprint(L_ERR, "Receiver : not radio info data");
    Detach();
    return;
  }
  
  bool newSong = false;
  if (songId == 0)
    songId = data[3];

  if (songId != data[3])
  {
    dprint(L_MSG, "New song!");
    songId = data[3];
    newSong = true;
  }
  
  if (infoVers == data[6])
    return;
  
  infoVers = data[6];
  dprint(L_MSG, "Updating info");

  data += 9;
  length -= 9;

  radioInfoData->Lock();

  char* tok = strtok((char*) data,"\x0A");
  int line=0;
  
  while (tok && line < INFO_LINES)
  {
    strncpy(radioInfoData->infoData[line], tok, MAX_STR_LEN); 
    radioInfoData->infoData[line][MAX_STR_LEN-1] = '\0'; // Just in case  
    tok = strtok(NULL, "\x0A");
    line++;
  }
  
  radioInfoData->newSong = newSong;
  
  radioInfoData->Unlock();
  
  // Last 4 bytes after 00 are CRC ???
}


///////////////////////////////////////////////////////////////////////////////