/****************************************************************************
 * 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 <aqhome/msgmanager.h>
#include <aqhome/msg/endpoint_log.h>
#include <aqhome/msg/endpoint_tty.h>
#include <aqhome/ipc/endpoint_node_ipc_tcpd.h>
#include <aqhome/mqtt/endpoint_mqttc.h>

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

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

#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif

#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif

#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>


#define I18N(msg) msg
#define I18S(msg) msg




static int _serve(GWEN_DB_NODE *dbArgs);
static GWEN_MSG_ENDPOINT_MGR *_setupService(GWEN_DB_NODE *dbArgs);

static int _setupTty(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_DB_NODE *dbArgs);
static int _setupLog(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_DB_NODE *dbArgs);
static int _setupIpc(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_DB_NODE *dbArgs);
static int _setupMqtt(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_DB_NODE *dbArgs);

static int _readArgs(int argc, char **argv, GWEN_DB_NODE *dbArgs);
static int _createPidFile(const char *pidFilename);


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

static int stopService=0;




int main(int argc, char **argv)
{
  GWEN_DB_NODE *dbArgs;
  int rv;
  GWEN_GUI *gui;
  const char *s;

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

  GWEN_Logger_Open(0, "aqhomed", 0, GWEN_LoggerType_Console, GWEN_LoggerFacility_User);
  GWEN_Logger_SetLevel(0, GWEN_LoggerLevel_Warning);
  GWEN_Logger_SetLevel(0, GWEN_LoggerLevel_Info);

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

  dbArgs=GWEN_DB_Group_new("arguments");
  rv=_readArgs(argc, argv, dbArgs);
  if (rv<0) {
    DBG_INFO(NULL, "here (%d)", rv);
    return 2;
  }
  else if (rv==1) {
    DBG_INFO(NULL, "Help printed, done");
    return 0;
  }

  gui=GWEN_Gui_CGui_new();
  s=GWEN_DB_GetCharValue(dbArgs, "charset", 0, NULL);
  if (s && *s)
    GWEN_Gui_SetCharSet(gui, s);
  GWEN_Gui_SetGui(gui);

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

  return 0;
}



int _serve(GWEN_DB_NODE *dbArgs)
{
  const char *pidFile;
  GWEN_MSG_ENDPOINT_MGR *emgr;
  int rv;

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

  pidFile=GWEN_DB_GetCharValue(dbArgs, "pidfile", 0, "aqhomed.pid");
  if (pidFile && *pidFile) {
    rv=_createPidFile(pidFile);
    if (rv<0) {
      DBG_INFO(NULL, "here (%d)", rv);
      return rv;
    }
  }

  emgr=_setupService(dbArgs);
  if (emgr==NULL) {
    DBG_INFO(NULL, "Error setting up service");
    return GWEN_ERROR_GENERIC;
  }

  while(!stopService) {
    DBG_DEBUG(NULL, "Next loop");
    AQH_MsgManager_LoopOnce(emgr);
  }

  if (pidFile && *pidFile)
    remove(pidFile);

  return 0;
}



GWEN_MSG_ENDPOINT_MGR *_setupService(GWEN_DB_NODE *dbArgs)
{
  GWEN_MSG_ENDPOINT_MGR *emgr;
  int nodeAddress;
  const char *dbfile;
  int rv;

  nodeAddress=GWEN_DB_GetIntValue(dbArgs, "nodeAddress", 0, 240);
  dbfile=GWEN_DB_GetCharValue(dbArgs, "dbfile", 0, "aqhome.db");

  emgr=AQH_MsgManager_new(nodeAddress & 0xff);

  if (dbfile && *dbfile)
    AQH_MsgManager_SetDbFilename(emgr, dbfile);

  rv=_setupTty(emgr, dbArgs);
  if (rv<0) {
    DBG_INFO(NULL, "here (%d)", rv);
    GWEN_MsgEndpointMgr_free(emgr);
    return NULL;
  }

  rv=_setupLog(emgr, dbArgs);
  if (rv<0) {
    DBG_INFO(NULL, "here (%d)", rv);
    GWEN_MsgEndpointMgr_free(emgr);
    return NULL;
  }

  rv=_setupIpc(emgr, dbArgs);
  if (rv<0) {
    DBG_INFO(NULL, "here (%d)", rv);
    GWEN_MsgEndpointMgr_free(emgr);
    return NULL;
  }

  rv=_setupMqtt(emgr, dbArgs);
  if (rv<0) {
    DBG_INFO(NULL, "here (%d)", rv);
    GWEN_MsgEndpointMgr_free(emgr);
    return NULL;
  }

  return emgr;
}



int _setupTty(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_DB_NODE *dbArgs)
{
  const char *devicePath;

  devicePath=GWEN_DB_GetCharValue(dbArgs, "device", 0, "/dev/ttyUSB0");
  if (devicePath && *devicePath) {
    GWEN_MSG_ENDPOINT *epTty;

    epTty=AQH_TtyNodeEndpoint_new(devicePath, AQH_MSGMGR_ENDPOINTGROUP_NODE);
    if (epTty==NULL) {
      DBG_ERROR(NULL, "Error creating endpoint TTY");
      return GWEN_ERROR_GENERIC;
    }
    GWEN_MsgEndpoint_SetAcceptedGroupIds(epTty, AQH_MSGMGR_ENDPOINTGROUP_NODE);
    GWEN_MsgEndpointMgr_AddEndpoint(emgr, epTty);
  }
  else {
    DBG_ERROR(NULL, "Missing device path");
    return GWEN_ERROR_GENERIC;
  }

  return 0;
}



int _setupLog(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_DB_NODE *dbArgs)
{
  const char *logFile;

  logFile=GWEN_DB_GetCharValue(dbArgs, "logfile", 0, NULL);
  if (logFile && *logFile) {
    GWEN_MSG_ENDPOINT *epLog;

    epLog=AQH_LogEndpoint_new(logFile, AQH_MSGMGR_ENDPOINTGROUP_NODE);
    if (epLog==NULL) {
      DBG_ERROR(AQH_LOGDOMAIN, "Error creating endpoint LOG");
      return GWEN_ERROR_GENERIC;
    }
    GWEN_MsgEndpoint_SetAcceptedGroupIds(epLog, AQH_MSGMGR_ENDPOINTGROUP_NODE);
    GWEN_MsgEndpointMgr_AddEndpoint(emgr, epLog);
  }
  return 0;
}



int _setupIpc(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_DB_NODE *dbArgs)
{
  const char *tcpAddress;
  int tcpPort;

  tcpAddress=GWEN_DB_GetCharValue(dbArgs, "tcpAddress", 0, NULL);
  tcpPort=GWEN_DB_GetIntValue(dbArgs, "tcpPort", 0, 45454);

  if (tcpAddress && *tcpAddress && tcpPort) {
    GWEN_MSG_ENDPOINT *epTcp;

    epTcp=AQH_TcpdIpcNodeEndpoint_new(tcpAddress, tcpPort, NULL, AQH_MSGMGR_ENDPOINTGROUP_NODE|AQH_MSGMGR_ENDPOINTGROUP_IPC);
    if (epTcp==NULL) {
      DBG_ERROR(AQH_LOGDOMAIN, "Error creating endpoint TCP");
      return GWEN_ERROR_GENERIC;
    }
    GWEN_MsgEndpoint_SetAcceptedGroupIds(epTcp, AQH_MSGMGR_ENDPOINTGROUP_NODE | AQH_MSGMGR_ENDPOINTGROUP_IPC);
    GWEN_MsgEndpointMgr_AddEndpoint(emgr, epTcp);
  }
  return 0;
}



int _setupMqtt(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_DB_NODE *dbArgs)
{
  const char *mqttAddress;
  int mqttPort;
  const char *mqttClientId;
  const char *mqttTopicPrefix;
  int mqttKeepAlive;

  mqttAddress=GWEN_DB_GetCharValue(dbArgs, "mqttAddress", 0, NULL);
  mqttPort=GWEN_DB_GetIntValue(dbArgs, "mqttPort", 0, 1883);
  mqttClientId=GWEN_DB_GetCharValue(dbArgs, "mqttClientId", 0, "aqhomed");
  mqttTopicPrefix=GWEN_DB_GetCharValue(dbArgs, "mqttTopicPrefix", 0, "aqhome/sensors");
  mqttKeepAlive=GWEN_DB_GetIntValue(dbArgs, "mqttKeepAlive", 0, 600);

  if (mqttAddress && *mqttAddress && mqttPort) {
    GWEN_MSG_ENDPOINT *epMqtt;

    DBG_INFO(AQH_LOGDOMAIN, "Connecting to %s (port %d)", mqttAddress, mqttPort);
    epMqtt=AQH_MqttClientEndpoint_new(mqttAddress, mqttPort, NULL, AQH_MSGMGR_ENDPOINTGROUP_MQTT);
    if (epMqtt==NULL) {
      DBG_ERROR(AQH_LOGDOMAIN, "Error creating endpoint TCP");
      return GWEN_ERROR_GENERIC;
    }
    GWEN_MsgEndpoint_SetAcceptedGroupIds(epMqtt, AQH_MSGMGR_ENDPOINTGROUP_NODE | AQH_MSGMGR_ENDPOINTGROUP_MQTT);
    if (mqttClientId && *mqttClientId)
      AQH_MqttClientEndpoint_SetClientId(epMqtt, mqttClientId);
    if (mqttTopicPrefix && *mqttTopicPrefix)
      AQH_MqttClientEndpoint_SetTopicPrefix(epMqtt, mqttTopicPrefix);
    AQH_MqttClientEndpoint_SetKeepAliveTime(epMqtt, mqttKeepAlive);

    GWEN_MsgEndpointMgr_AddEndpoint(emgr, epMqtt);
  }
  return 0;
}



int _readArgs(int argc, char **argv, GWEN_DB_NODE *dbArgs)
{
  int rv;
  const GWEN_ARGS args[]= {
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Char,           /* type */
      "cfgdir",                     /* name */
      0,                            /* minnum */
      1,                            /* maxnum */
      "D",                          /* short option */
      "cfgdir",                     /* long option */
      I18S("Specify the configuration folder"),
      I18S("Specify the configuration folder")
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Char,           /* type */
      "charset",                    /* name */
      0,                            /* minnum */
      1,                            /* maxnum */
      0,                            /* short option */
      "charset",                    /* long option */
      I18S("Specify the output character set"),       /* short description */
      I18S("Specify the output character set")        /* long description */
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Char,           /* type */
      "device",                     /* name */
      0,                            /* minnum */
      1,                            /* maxnum */
      "d",                          /* short option */
      "device",                     /* long option */
      I18S("Specify the device to communicate with (e.g. /dev/ttyUSB0)"),
      I18S("Specify the device to communicate with (e.g. /dev/ttyUSB0)")
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Int,            /* type */
      "nodeAddress",                /* name */
      0,                            /* minnum */
      1,                            /* maxnum */
      "n",                          /* short option */
      "node",                     /* long option */
      I18S("Specify the node address for the AqHome node adaptor (default 240)"),
      I18S("Specify the node address for the AqHome node adaptor (default 240)")
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Char,           /* type */
      "logFile",                    /* name */
      0,                            /* minnum */
      1,                            /* maxnum */
      "l",                          /* short option */
      "logfile",                    /* long option */
      I18S("Specify a logfile to log received messages to"),
      I18S("Specify a logfile to log received messages to")
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Char,           /* type */
      "tcpAddress",                 /* name */
      0,                            /* minnum */
      1,                            /* maxnum */
      "t",                          /* short option */
      "tcpaddress",                 /* long option */
      I18S("Specify the TCP address to listen on (disabled if missing)"),
      I18S("Specify the TCP address to listen on (disabled if missing)")
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Int,            /* type */
      "tcpPort",                    /* name */
      0,                            /* minnum */
      1,                            /* maxnum */
      "P",                          /* short option */
      "tcpport",                    /* long option */
      I18S("Specify the TCP port to listen on"),
      I18S("Specify the TCP port to listen on")
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Char,           /* type */
      "mqttAddress",                 /* name */
      0,                            /* minnum */
      1,                            /* maxnum */
      "ma",                         /* short option */
      "mqttaddress",                 /* long option */
      I18S("Specify the address of the MQTT server to connect to (disabled if missing)"),
      I18S("Specify the address of the MQTT server to connect to (disabled if missing)")
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Int,            /* type */
      "mqttPort",                    /* name */
      0,                             /* minnum */
      1,                             /* maxnum */
      "mp",                          /* short option */
      "mqttport",                    /* long option */
      I18S("Specify the port of the MQTT server (default: 1883)"),
      I18S("Specify the port of the MQTT server (default: 1883)")
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Char,           /* type */
      "mqttClientId",                /* name */
      0,                             /* minnum */
      1,                             /* maxnum */
      NULL,                          /* short option */
      "mqttclientid",                /* long option */
      I18S("Specify client id for the MQTT server (default: \"aqhomed\")"),
      I18S("Specify client id for the MQTT server (default: \"aqhomed\")")
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Char,           /* type */
      "mqttTopicPrefix",            /* name */
      0,                             /* minnum */
      1,                             /* maxnum */
      "mt",                          /* short option */
      "mqtttopicprefix",             /* long option */
      I18S("Specify prefix of MQTT topics when publishing (defaults to \"aqhome/sensors\")"),
      I18S("Specify prefix of MQTT topics when publishing (defaults to \"aqhome/sensors\")")
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Int,            /* type */
      "mqttKeepAlive",              /* name */
      0,                             /* minnum */
      1,                             /* maxnum */
      "mk",                          /* short option */
      "mqttkeepalive",                    /* long option */
      I18S("Specify keepalive time in seconds (defaults: 600)"),
      I18S("Specify keepalive time in seconds (defaults: 600)")
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Char,           /* type */
      "dbfile",                     /* name */
      0,                            /* minnum */
      1,                            /* maxnum */
      "db",                         /* short option */
      "dbfile",                    /* long option */
      I18S("Specify DB file to read/write node database"),
      I18S("Specify DB file to read/write node database")
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Char,           /* type */
      "pidfile",                    /* name */
      0,                            /* minnum */
      1,                            /* maxnum */
      "p",                          /* short option */
      "pidfile",                    /* long option */
      I18S("Specify the PID file"),
      I18S("Specify the PID file")
    },
    {
      GWEN_ARGS_FLAGS_HELP | GWEN_ARGS_FLAGS_LAST, /* flags */
      GWEN_ArgsType_Int,            /* type */
      "help",                       /* name */
      0,                            /* minnum */
      0,                            /* maxnum */
      "h",                          /* short option */
      "help",
      I18S("Show this help screen."),
      I18S("Show this help screen.")
    }
  };

  rv=GWEN_Args_Check(argc, argv, 1, 0, args, dbArgs);
  if (rv==GWEN_ARGS_RESULT_ERROR) {
    fprintf(stderr, "ERROR: Could not parse arguments main\n");
    return GWEN_ERROR_INVALID;
  }
  else if (rv==GWEN_ARGS_RESULT_HELP) {
    GWEN_BUFFER *ubuf;

    ubuf=GWEN_Buffer_new(0, 1024, 0, 1);
    GWEN_Buffer_AppendArgs(ubuf,
                           I18N("This is version %s.\nUsage: %s [OPTIONS]\n\nOptions:\n"),
                           AQHOME_VERSION_STRING,
                           argv[0]);
    if (GWEN_Args_Usage(args, ubuf, GWEN_ArgsOutType_Txt)) {
      fprintf(stderr, "ERROR: Could not create help string\n");
      return 1;
    }
    GWEN_Buffer_AppendString(ubuf, "\n");

    fprintf(stdout, "%s\n", GWEN_Buffer_GetStart(ubuf));
    GWEN_Buffer_free(ubuf);
    return GWEN_ERROR_CLOSE;
  }
  return 0;
}



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;

#  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;
  default:
    DBG_WARN(0, "Unknown signal %d",s);
    break;
  }
}



int _createPidFile(const char *pidFilename)
{
  FILE *f;
  int pidfd;

  if (remove(pidFilename)==0) {
    DBG_ERROR(0, "Old PID file existed, removed. (Unclean shutdown?)");
  }

#ifdef HAVE_SYS_STAT_H
  pidfd = open(pidFilename, O_EXCL|O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
  if (pidfd < 0) {
    DBG_ERROR(NULL, "Could not create PID file \"%s\" (%s), aborting.", pidFilename, strerror(errno));
    return GWEN_ERROR_IO;
  }

  f = fdopen(pidfd, "w");
#else /* HAVE_STAT_H */
  f=fopen(pidFilename,"w+");
#endif /* HAVE_STAT_H */

  /* write pid */
#ifdef HAVE_GETPID
  fprintf(f,"%d\n",getpid());
#else
  fprintf(f,"-1\n");
#endif
  if (fclose(f)) {
    DBG_ERROR(0, "Could not close PID file \"%s\" (%s), aborting.", pidFilename, strerror(errno));
    return GWEN_ERROR_IO;
  }
  return 0;
}