/****************************************************************************
 * 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 "./init.h"
#include "./aqhome_mqtt_p.h"
#include "./xmlread.h"
#include "./xmlwrite.h"

#include "aqhome/aqhome.h"
#include "aqhome/ipc/endpoint_ipc.h"
#include "aqhome/ipc/endpoint_ipcclient.h"
#include "aqhome/mqtt/endpoint_mqttc.h"

#include <gwenhywfar/endpoint_multilayer.h>
#include <gwenhywfar/args.h>
#include <gwenhywfar/debug.h>

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



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

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



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

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



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

int AqHomeMqtt_Init(AQHOME_MQTT *aqh, int argc, char **argv)
{
  int rv;
  GWEN_DB_NODE *dbArgs;
  const char *s;

  dbArgs=GWEN_DB_Group_new("args");
  rv=_readArgs(argc, argv, dbArgs);
  if (rv<0) {
    DBG_ERROR(NULL, "Error reading args (%d)", rv);
    return rv;
  }
  AQH_MergeConfigFileIntoConfig(dbArgs, "ConfigFile");
  aqh->dbArgs=dbArgs;

  aqh->timeout=GWEN_DB_GetIntValue(dbArgs, "timeout", 0, 0);

  s=GWEN_DB_GetCharValue(dbArgs, "pidfile", 0, AQHOME_MQTT_DEFAULT_PIDFILE);
  if (s && *s) {
    AqHomeMqtt_SetPidFile(aqh, s);
    rv=_createPidFile(s);
    if (rv<0) {
      DBG_ERROR(NULL, "Error creating PID file (%d)", rv);
      return rv;
    }
  }

  s=GWEN_DB_GetCharValue(dbArgs, "devicefile", 0, NULL);
  if (s && *s) {
    AqHomeMqtt_SetDeviceFile(aqh, s);
  }
  else {
    GWEN_BUFFER *bufFilename;

    bufFilename=AQH_GetRuntimeFilePath(AQHOME_MQTT_DEFAULT_DEVICEFILE);
    if (bufFilename) {
      AqHomeMqtt_SetDeviceFile(aqh, GWEN_Buffer_GetStart(bufFilename));
      GWEN_Buffer_free(bufFilename);
    }
    else {
      DBG_ERROR(NULL, "Could not setup filename for devices, please specify via command line argument");
      return GWEN_ERROR_GENERIC;
    }
  }

  aqh->rootEndpoint=GWEN_MsgEndpoint_new("root", 0);

  rv=_setupMqtt(aqh, dbArgs);
  if (rv<0) {
    DBG_ERROR(NULL, "Error setting up connection to broker (%d)", rv);
    return rv;
  }

  rv=_setupBroker(aqh, dbArgs);
  if (rv<0) {
    DBG_ERROR(NULL, "Error setting up connection to broker (%d)", rv);
    return rv;
  }

  AqHomeMqtt_LoadRuntimeDeviceFiles(aqh);

  AqHomeMqtt_ReloadDeviceFiles(aqh);

  return 0;
}



void AqHomeMqtt_ReloadDeviceFiles(AQHOME_MQTT *aqh)
{
  AQHMQTT_DEVICE_LIST *deviceList;

  DBG_ERROR(NULL, "Loading devices description files");
  deviceList=AqHomeMqttLog_ReadDataDeviceFiles(aqh);
  if (deviceList)
    AqHomeMqtt_SetAvailableDeviceList(aqh, deviceList);
}



void AqHomeMqtt_LoadRuntimeDeviceFiles(AQHOME_MQTT *aqh)
{
  AQHMQTT_DEVICE_LIST *deviceList;

  DBG_ERROR(NULL, "Loading registered devices from file \"%s\"", aqh->deviceFile);
  deviceList=AqHomeMqttLog_ReadDeviceFile(aqh, aqh->deviceFile);
  if (deviceList)
    AqHomeMqtt_SetRegisteredDeviceList(aqh, deviceList);
}



int AqHomeMqtt_SaveRuntimeDeviceFiles(AQHOME_MQTT *aqh)
{
  int rv;

  rv=AqHomeMqttLog_WriteDevicesFile(aqh, aqh->registeredDeviceList, aqh->deviceFile);
  if (rv<0) {
    DBG_INFO(NULL, "Error writing devices to \"%s\" (%d)", aqh->deviceFile, rv);
    return rv;
  }
  return 0;
}



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;
}



int _setupBroker(AQHOME_MQTT *aqh, GWEN_DB_NODE *dbArgs)
{
  const char *brokerAddress;
  int brokerPort;
  const char *brokerClientId;

  brokerAddress=GWEN_DB_GetCharValue(dbArgs, "brokerAddress", 0, NULL);
  if (!(brokerAddress && *brokerAddress))
    brokerAddress=GWEN_DB_GetCharValue(dbArgs, "ConfigFile/brokerAddress", 0, "127.0.0.1");

  brokerPort=GWEN_DB_GetIntValue(dbArgs, "brokerPort", 0, -1);
  if (brokerPort<0)
    brokerPort=GWEN_DB_GetIntValue(dbArgs, "ConfigFile/brokerPort", 0, AQHOME_MQTT_DEFAULT_BROKER_PORT);

  brokerClientId=GWEN_DB_GetCharValue(dbArgs, "brokerClientId", 0, AQHOME_MQTT_DEFAULT_BROKER_CLIENTID);

  if (brokerAddress && *brokerAddress && brokerPort) {
    GWEN_MSG_ENDPOINT *ep;
    GWEN_MSG_ENDPOINT *ipcBaseEndpoint;
    int rv;

    ep=AQH_ClientIpcEndpoint_new("brokerIpcClient", 0);
    ipcBaseEndpoint=AQH_IpcEndpoint_CreateIpcTcpClient(brokerAddress, brokerPort, "brokerPhysEndpoint", 0);
    AQH_IpcEndpoint_SetServiceName(ipcBaseEndpoint, brokerClientId);
    GWEN_MsgEndpoint_Tree2_AddChild(ep, ipcBaseEndpoint);

    GWEN_MsgEndpoint_Tree2_AddChild(aqh->rootEndpoint, ep);
    aqh->brokerEndpoint=ep;

    rv=GWEN_MultilayerEndpoint_StartConnect(ep);
    if (rv<0 && rv!=GWEN_ERROR_IN_PROGRESS) {
      DBG_ERROR(NULL, "Error connecting to broker server %s:%d (%d), will retry later", brokerAddress, brokerPort, rv);
      return rv;
    }
  }

  return 0;
}



int _setupMqtt(AQHOME_MQTT *aqh, GWEN_DB_NODE *dbArgs)
{
  const char *mqttAddress;
  int mqttPort;
  const char *mqttClientId;
  int mqttKeepAlive;

  mqttAddress=GWEN_DB_GetCharValue(dbArgs, "mqttAddress", 0, NULL);
  if (!(mqttAddress && *mqttAddress))
    mqttAddress=GWEN_DB_GetCharValue(dbArgs, "ConfigFile/mqttAddr", 0, "127.0.0.1");

  mqttPort=GWEN_DB_GetIntValue(dbArgs, "mqttPort", 0, 1883);
  if (mqttPort<0)
    mqttPort=GWEN_DB_GetIntValue(dbArgs, "ConfigFile/mqttPort", 0, 1883);

  mqttClientId=GWEN_DB_GetCharValue(dbArgs, "mqttClientId", 0, "aqhome-mqttlog");
  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(mqttClientId, mqttAddress, mqttPort, NULL, 0);
    if (epMqtt==NULL) {
      DBG_ERROR(AQH_LOGDOMAIN, "Error creating endpoint TCP");
      return GWEN_ERROR_IO;
    }
    AQH_MqttClientEndpoint_SetKeepAliveTime(epMqtt, mqttKeepAlive);
    GWEN_MsgEndpoint_AddFlags(epMqtt, AQH_ENDPOINT2_MQTTCLIENT_FLAGS_SUBSCRIBEALL);

    GWEN_MsgEndpoint_Tree2_AddChild(aqh->rootEndpoint, epMqtt);
    aqh->mqttEndpoint=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 */
      "brokerAddress",              /* name */
      0,                            /* minnum */
      1,                            /* maxnum */
      "ba",                         /* short option */
      "brokeraddress",                 /* long option */
      I18S("Specify the address of the broker server to connect to (disabled if missing)"),
      I18S("Specify the address of the broker server to connect to (disabled if missing)")
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Int,            /* type */
      "brokerPort",                    /* name */
      0,                             /* minnum */
      1,                             /* maxnum */
      "bp",                          /* short option */
      "brokerport",                    /* long option */
      I18S("Specify the port of the broker server (default: 1899)"),
      I18S("Specify the port of the broker server (default: 1899)")
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Char,           /* type */
      "brokerClientId",                /* name */
      0,                             /* minnum */
      1,                             /* maxnum */
      NULL,                          /* short option */
      "brokerclientid",                /* long option */
      I18S("Specify client id for the broker server (default: \"nodes\")"),
      I18S("Specify client id for the broker server (default: \"nodes\")")
    },

    {
      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_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 */
      "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_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Int,            /* type */
      "timeout",                    /* name */
      0,                            /* minnum */
      1,                            /* maxnum */
      "T",                          /* short option */
      "timeout",                     /* long option */
      I18S("Specify timeout in second (default: no timeout)"),
      I18S("Specify timeout in second (default: no timeout)")
    },
    {
      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
      GWEN_ArgsType_Char,           /* type */
      "devicefile",                 /* name */
      0,                            /* minnum */
      1,                            /* maxnum */
      "d",                          /* short option */
      "devicefile",                    /* long option */
      I18S("Specify the device file"),
      I18S("Specify the device 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;
}