/****************************************************************************
 * This file is part of the project AqHome.
 * AqHome (c) by 2023 Martin Preuss, all rights reserved.
 *
 * The license for this file can be found in the file COPYING which you
 * should have received along with this file.
 ****************************************************************************/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <aqhome/api.h>
#include <aqhome/aqhome.h>

#include "./server.h"

#include <gwenhywfar/gwenhywfar.h>
#include <gwenhywfar/logger.h>
#include <gwenhywfar/cgui.h>
#include <gwenhywfar/debug.h>

#ifdef HAVE_SIGNAL_H
# include <signal.h>
#endif


#define DISABLE_DEBUGLOG


//#define WRITE_INTERVAL_IN_SECS   (5*60)

#define WRITE_INTERVAL_IN_SECS      60
#define PING_INTERVAL               120
#define CONNCLEAN_INTERVAL_IN_SECS  10



/* ------------------------------------------------------------------------------------------------
 * defines
 * ------------------------------------------------------------------------------------------------
 */




/* ------------------------------------------------------------------------------------------------
 * forward declarations
 * ------------------------------------------------------------------------------------------------
 */

#ifdef HAVE_SIGNAL_H
static int _setSignalHandlers(void);
static int _setupSigAction(struct sigaction *sa, int sig);
static void _signalHandler(int s);
#endif

static void _runService(AQH_OBJECT *aqh, AQH_EVENT_LOOP *eventLoop);
static void _writeCurrentState(AQH_OBJECT *aqh);
static int _diffInSeconds(time_t t1, time_t t0);



/* ------------------------------------------------------------------------------------------------
 * static vars
 * ------------------------------------------------------------------------------------------------
 */

#ifdef HAVE_SIGNAL_H
static struct sigaction saINT,saTERM, saHUP, saTSTP, saCONT, saPIPE;
#endif

static int stopService=0;



/* ------------------------------------------------------------------------------------------------
 * implementations
 * ------------------------------------------------------------------------------------------------
 */

int main(int argc, char **argv)
{
  int rv;
  AQH_EVENT_LOOP *eventLoop;
  AQH_OBJECT *aqh;
  GWEN_GUI *gui;

  rv=GWEN_Init();
  if (rv) {
    fprintf(stderr, "ERROR: Unable to init Gwen.\n");
    return 2;
  }

  GWEN_Logger_Open(0, "aqhome-data", 0, GWEN_LoggerType_Console, GWEN_LoggerFacility_User);
  GWEN_Logger_SetLevel(0, GWEN_LoggerLevel_Warning);

  rv=_setSignalHandlers();
  if (rv<0) {
    DBG_INFO(NULL, "here (%d)", rv);
    return rv;
  }

  rv=AQH_Init();
  if (rv<0) {
    DBG_INFO(NULL, "here (%d)", rv);
    return 2;
  }

  gui=GWEN_Gui_CGui_new();
  GWEN_Gui_SetGui(gui);

  eventLoop=AQH_EventLoop_new();
  aqh=AqHomeDataServer_new(eventLoop);
  rv=AqHomeDataServer_Init(aqh, argc, argv);
  if (rv<0) {
    DBG_INFO(NULL, "here (%d)", rv);
    return 2;
  }

  _runService(aqh, eventLoop);

  AqHomeDataServer_Fini(aqh);
  AQH_Object_free(aqh);
  AQH_EventLoop_free(eventLoop);

  GWEN_Gui_SetGui(NULL);
  GWEN_Gui_free(gui);

  return 0;
}



void _runService(AQH_OBJECT *aqh, AQH_EVENT_LOOP *eventLoop)
{
  time_t timeStart;
  time_t timeLastWrite;
  time_t timeLastConnectionCleanup;
  int timeout;

  timeout=AqHomeDataServer_GetTimeout(aqh);
  timeStart=time(NULL);
  timeLastWrite=time(NULL);
  timeLastConnectionCleanup=time(NULL);

  while(!stopService) {
    time_t now;

    DBG_INFO(NULL, "Next loop (%d clients)", AqHomeDataServer_GetClientNum(aqh));
    AQH_EventLoop_Run(eventLoop, 2000);
    AqHomeDataServer_HandleClientMsgs(aqh);

    now=time(NULL);

    if (_diffInSeconds(now, timeLastConnectionCleanup)>CONNCLEAN_INTERVAL_IN_SECS) {
      DBG_INFO(NULL, "Cleanup connections");
      AqHomeDataServer_CleanupClients(aqh);
      timeLastConnectionCleanup=now;
    }

    if (_diffInSeconds(now, timeLastWrite)>WRITE_INTERVAL_IN_SECS) {
      DBG_INFO(NULL, "Write time");
      _writeCurrentState(aqh);
      timeLastWrite=now;
    }

    if (timeout && (_diffInSeconds(now, timeStart)>timeout)) {
      DBG_ERROR(NULL, "Timeout");
      _writeCurrentState(aqh);
      break;
    }
  } /* while */
}



int _diffInSeconds(time_t t1, time_t t0)
{
  return t1-t0;
}


void _writeCurrentState(AQH_OBJECT *aqh)
{
  int rv;

  rv=AqHomeDataServer_WriteStorageIfChanged(aqh);
  if (rv<0) {
    DBG_ERROR(NULL, "ATTENTION: Could not write storage statefile (%d)", rv);
  }
}




int _setSignalHandlers(void)
{
#ifdef HAVE_SIGNAL_H
  int rv;

  rv=_setupSigAction(&saINT, SIGINT);
  if (rv)
    return rv;

  rv=_setupSigAction(&saTERM, SIGTERM);
  if (rv)
    return rv;

  rv=_setupSigAction(&saHUP, SIGHUP);
  if (rv)
    return rv;

  rv=_setupSigAction(&saPIPE, SIGPIPE);
  if (rv)
    return rv;

#  ifdef SIGTSTP
  rv=_setupSigAction(&saTSTP, SIGTSTP);
  if (rv)
    return rv;
#  endif

#  ifdef SIGCONT
  rv=_setupSigAction(&saCONT, SIGCONT);
  if (rv)
    return rv;
#  endif
#endif
  return 0;
}



int _setupSigAction(struct sigaction *sa, int sig)
{
  sa->sa_handler=_signalHandler;
  sigemptyset(&sa->sa_mask);
  sa->sa_flags=0;
  if (sigaction(sig, sa, 0)) {
    DBG_ERROR(NULL, "Could not setup signal handler for signal %d", sig);
    return GWEN_ERROR_IO;
  }

  return 0;
}



void _signalHandler(int s)
{
  switch(s) {
  case SIGINT:
  case SIGTERM:
  case SIGHUP:
    DBG_WARN(0, "Received signal %d, stopping service in next loop.",s);
    stopService=1;
    break;
  case SIGPIPE:
    DBG_WARN(0, "Received PIPE signal");
    break;
  default:
    DBG_WARN(0, "Unknown signal %d",s);
    break;
  }
}