#include <strings.h>
#include <tcl.h>
#include <time.h>
#include <math.h>
#include "sics.h"
#include "sicsobj.h"
#include "splitter.h"
#include "initializer.h"
#include "commandlog.h"
#include "hipadaba.h"
#include "sicshipadaba.h"
#include "dynstring.h"
#include "devser.h"
#include "ascon.h"
#include "macro.h"
#include "scriptcontext.h"


#define MAX_HDB_PATH 1024

typedef struct ContextItem {
  struct ContextItem *next;
  Hdb *node;
  Hdb *controllerNode;
} ContextItem;

typedef struct ScriptContext {
  ObjectDescriptor *desc;
  ContextItem *nodes;
  ContextItem *trash;
  Hdb *sendNode;
  int sendCalled;
} ScriptContext;

struct SctController {
  DevSer *devser;
  Hdb *node;                    /* the controller node */
  SConnection *conn;
  int verbose;
};

/* action data and write callback data */
typedef struct SctData {
  char *name;
  SctController *controller;
  SConnection *conCtx;
  int answered;
  int inMacro;
  Hdb *node;
} SctData;

static ScriptContext *sct = NULL;
static SctData *queueData = NULL;

static struct {
  char *name;
} actionCallback;

static char *mainCallback = "main callback";

void PushContext(Hdb * node, Hdb * controllerNode)
{
  ContextItem *new;

  if (sct->trash == NULL) {
    new = calloc(1, sizeof(*new));
  } else {
    new = sct->trash;
    sct->trash = sct->trash->next;
  }
  new->next = sct->nodes;
  sct->nodes = new;
  new->node = node;
  new->controllerNode = controllerNode;
}

void PopContext(void)
{
  ContextItem *c;

  c = sct->nodes;
  assert(c);
  sct->nodes = c->next;
  c->next = sct->trash;
  sct->trash = c;
}

void CleanStack(Hdb * node)
{
  ContextItem *s;

  /* clean context from killed nodes */
  for (s = sct->nodes; s != NULL; s = s->next) {
    if (s->node == node) {
      s->node = NULL;
    }
    if (s->controllerNode == node) {
      s->controllerNode = NULL;
    }
  }
}

static void SetProp(Hdb * node, Hdb * cNode, char *key, char *value)
{
  char *val;

  if (node == NULL) {
    if (cNode == NULL)
      return;
    node = cNode;
  } else {
    val = GetHdbProp(node, key);
    if (val == NULL && cNode != NULL) {
      val = GetHdbProp(cNode, key);
      if (val != NULL) {
        node = cNode;
      }
    }
  }
  if (value == NULL) {
    if (GetHdbProperty(node, key, NULL, 0) > 0) {
      SetHdbProperty(node, key, "");
    }
  } else {
    SetHdbProperty(node, key, value);
  }
}

static char *GetProp(Hdb * node, Hdb * cNode, char *key)
{
  char *val;

  if (node != NULL) {
    val = GetHdbProp(node, key);
    if (val != NULL)
      return val;
  }
  if (cNode != NULL) {
    val = GetHdbProp(cNode, key);
  }
  return val;
}

/*
 * This is the actual sct command available in scripts.
 */
int SctCommand(SConnection * con, SicsInterp * sics, void *object,
               int argc, char *argv[])
{
  static char value[1024];
  char *val;
  char error[512];
  Hdb *node = NULL;
  Hdb *cNode = NULL;
  hdbValue v;
  double dtime;
  
  assert(sct == object);
  if (sct->nodes != NULL) {
    node = sct->nodes->node;
    cNode = sct->nodes->controllerNode;
  }
  if (node == NULL && cNode == NULL) {
    SCPrintf(con, eError, "ERROR: %s may be called only in proper context",
             argv[0]);
    return 0;
  }
  if (argc <= 1) {
    GetHdbPath(node, value, sizeof value);
    SCWrite(con, value, eValue);
    return 1;
  }

  /*
   * update command
   */
  if (strcmp(argv[1], "update") == 0) {
    cloneHdbValue(&node->value, &v);
    Arg2Text(argc - 2, argv + 2, value, sizeof value);
    if (!readHdbValue(&v, value, error, 512)) {
      SCWrite(con, error, eError);
      return 0;
    }
    UpdateHipadabaPar(node, v, con);
    ReleaseHdbValue(&v);
    SetHdbProperty(node, "geterror", NULL);
    return 1;
  }

  /*
   * print
   */
  if (strcmp(argv[1], "print") == 0) {
    if (queueData != NULL) {
      queueData->answered = 1;
      SCsetMacro(con, queueData->inMacro); /* take macro flag stored at set callback */
    }
    Arg2Text(argc - 2, argv + 2, value, sizeof value);
    SCWrite(con, value, eWarning);
    SCsetMacro(con, 1); /* where are always in Macro */
    return 1;
  }

  /**
   * controller
   */
  if (strcmp(argv[1], "controller") == 0) {
    SCWrite(con, cNode->name, eValue);
    return 1;
  }

  /*
   * time stamping
   */
  if (strcmp(argv[1], "utime") == 0) {
    if (argc < 3) {
      SCWrite(con, "ERROR: need property to write time stamp too", eError);
      return 0;
    }
    dtime = DoubleTime();
    snprintf(value, 1024, "%.3f", dtime);
    SetHdbProperty(node, argv[2], value);
    return 1;
  }

  /*
   * send command
   */
  if (strcmp(argv[1], "send") == 0 && argc > 2) {
    if (sct->sendNode != node) {
      SCPrintf(con, eError, "ERROR: %s may be called only in action scripts",
               argv[0]);
      return 0;
    }
    sct->sendCalled = 1;
    /* continue with property handling */
  }

  /*
   * property handling
   */
  if (argc == 2) {              /* get case */
    val = GetProp(node, cNode, argv[1]);
    if (val == NULL) {
      SCPrintf(con, eError, "ERROR: %s %s not found", argv[0], argv[1]);
      return 0;
    }
    SCWrite(con, val, eValue);
  } else {                      /* set case */
    if (argc == 3) {
      SetProp(node, cNode, argv[1], argv[2]);
    } else {
      val = Arg2Tcl(argc - 2, argv + 2, value, sizeof value);
      SetProp(node, cNode, argv[1], val);
      if (val != NULL && val != value)
        free(val);
    }
  }
  return 1;
}

int SctCallInContext(SConnection * con, char *script, Hdb * node,
                     SctController * controller, char **resPtr)
{
  Tcl_Interp *pTcl = InterpGetTcl(pServ->pSics);
  int ret, l;
  char *result = NULL;
  int iRet = 1;
  int verbose = controller->verbose;

  PushContext(node, controller->node);
  if (verbose) {
    SCPrintf(con, eLog, "script: %s", script);
  }

  MacroPush(con);
  l = strlen(script);
  ret = Tcl_EvalEx(pTcl, script, l, 0);
  result = (char *) Tcl_GetStringResult(pTcl);
  if (ret != TCL_OK && result[0] != '\0') {
    if (strncmp(result, "ERROR:", 6) == 0) {
      /* remove "ERROR:", as it will be added later */
      result += 6;
      if (result[0] == ' ') {
        result++;
      }
    }
    if (verbose) {
      SCPrintf(con, eLog, "error: %s", result);
    }
    iRet = 0;
  }
  *resPtr = result;

  MacroPop();
  PopContext();
  return iRet;
}

static int SctMatch(void *data1, void *data2)
{
  SctData *a = data1;
  SctData *b = data2;

  return a->node == b->node && strcasecmp(a->name, b->name) == 0;
}
/*
 * This routine is running the script chain
 */
static char *SctActionHandler(void *actionData, char *lastReply,
                              int commError)
{
  SctData *data = actionData;
  Hdb *node = data->node;
  SctController *controller = data->controller;
  char *state;
  char *result;
  char *script = NULL;
  char *errorScript = NULL;
  char *send = NULL;
  int i;
  SConnection *con;
  char eprop[80];
  char msg[1024];
  char path[1024];
  char origScript[80];
  char *blank;
  char *emsg;
  size_t l;
  int cnt;
  int ret;
  char timeKey[50], timeVal[50];
  int iMacro;
  
  if (queueData != NULL && queueData->conCtx != NULL) {
    con = queueData->conCtx;
  } else {
    con = controller->conn;
  }
  /*
   * If this is a followup call, the I/O system will have set the 
   * property result to the data from the device. Read this now and 
   * print it if diagnostics is required.
   */
  SetProp(node, controller->node, "result", lastReply);
  script = NULL;
  if (!commError && controller->verbose && lastReply != NULL
      && *lastReply != '\0') {
    SCPrintf(con, eLog, "reply : %s", lastReply);
  }
  
  /*
   * When this is a followup, we use the  content of the 
   * state field as the property storing the next script to 
   * run. If this is the start of a chain this is set to the 
   * data->name which is either read or write
   */
  state = GetProp(node, controller->node, "state");
  if (state == NULL || strcasecmp(state, "idle") == 0) {
    state = data->name;
    SetProp(node, controller->node, "state", state);
  }
  
  /*
   * Sometimes one wishes to call multiple scripts in succession 
   * before returning into I/O. Such scripts then do not set the 
   * send property. The loop is taking care of this. Not more 
   * then 10 scripts can be changed in this way. 
   */
  for (i = 0; i < 10; i++) {
	  /*
	   * read the script to invoke from the property living 
	   * in state
	   */
    script = GetProp(node, controller->node, state);
    if (script == NULL)
      script = state;
    snprintf(origScript, sizeof origScript, "%s", script);
    if (commError) {
      errorScript = GetProp(node, controller->node, "commerror");
      if (errorScript != NULL)
        script = errorScript;
      commError = 0;
    }
    /*
     * Set the context and invoke the script
     */
    script = strdup(script);
    sct->sendNode = node;
    sct->sendCalled = 0;
    ret = SctCallInContext(con, script, node, controller, &result);
    sct->sendNode = NULL;
    if (ret == 0) {
    	/*
    	 * an error occurred in the script: complain bitterly
    	 */
      snprintf(eprop, sizeof eprop, "error_during_%s", data->name);
      emsg = GetHdbProp(node, eprop);
      if (emsg == NULL || con != controller->conn) {
        GetHdbPath(node, path, sizeof path);
        SCPrintf(con, eError,
                 "ERROR: action <%s> in {%s} node %s:\nERROR:   %s",
                 data->name, origScript, path, result);
      }
      snprintf(msg, sizeof msg, "<%s> %s", origScript, result);
      SetHdbProperty(node, eprop, msg);
      blank = strchr(origScript, ' ');
      if (blank != NULL) {
        l = blank - origScript;
      } else {
        l = strlen(origScript);
      }
      snprintf(eprop, sizeof eprop, "error_in_%.*s", l, origScript);
      emsg = GetHdbProp(node, eprop);
      cnt = 0;
      if (emsg != NULL) {
        sscanf(emsg, "%d", &cnt);
      }
      cnt++;
      snprintf(msg, sizeof msg, "%dx {%s}: %s", cnt, origScript, result);
      SetHdbProperty(node, eprop, msg);
      send = NULL;
      free(script);
      goto finish;
    }
    /*
     * The script executed OK. 
     * The next state is the result
     */
    state = result;
    /*
     * if the new state is idle, clean everything up 
     * and terminate the script chain
     */
    if (strcasecmp(state, "idle") == 0 || strcasecmp(state, "unpoll") == 0) {
    	/* 
    	 * send an O.k. if there was no othe rreply on write's
    	 */
      if (queueData == data && !data->answered) {
        if (queueData->inMacro == 0) {
          iMacro = SCinMacro(con);
          con->iMacro = 0;
          SCWrite(con, "o.k.", eValue);
          SCsetMacro(con, iMacro);
        }
      }
      snprintf(eprop, sizeof eprop, "error_during_%s", data->name);
      emsg = GetHdbProp(node, eprop);
      if (emsg != NULL) {
        GetHdbPath(node, path, sizeof path);
        SCPrintf(con, eError,
                 "action <%s>: success after error message (%s)\n  %s",
                 data->name, path, emsg);
        SetHdbProperty(node, eprop, NULL);
      }
      snprintf(timeKey, sizeof timeKey, "%s_time", data->name);
      snprintf(timeVal, sizeof timeVal, "%.3f", DoubleTime());
      SetHdbProperty(node, timeKey, timeVal);
      send = NULL;
      free(script);
      goto finish;
    }
    /*
     * set the state property to the next state for
     * the next invocation of this routine
     */
    SetProp(node, controller->node, "state", state);
    free(script);
    script = NULL;
    /*
     * If there is data to send, check it and do so
     */
    if (sct->sendCalled) {
      send = GetProp(node, controller->node, "send");
      if (send == NULL)
        send = "";
      if (controller->verbose) {
        SCPrintf(con, eLog, "send  : %s", send);
      }
      return send;
    }
  }
  SCPrintf(con, eLogError, "ERROR: too many quick scripts chained");
finish:
  if (strcmp(data->name, "write") == 0) {
    SetProp(node, controller->node, "writestatus", "commandsent");
  }
  if (strcasecmp(state, "unpoll") == 0) {
    DevUnschedule(controller->devser, data, SctActionHandler, SctMatch);
    send = NULL;
  }
  SetProp(node, controller->node, "state", "idle");
  if (data->conCtx != NULL) {
    SCDeleteConnection(data->conCtx);
    data->conCtx = NULL;
  }
  return send;
}

static char *SctWriteHandler(void *actionData, char *lastReply,
                             int commError)
{
  SctData *data = actionData;
  SctData *old;
  char *result;

  old = queueData;
  queueData = data;
  result = SctActionHandler(data, lastReply, commError);
  queueData = old;
  return result;
}

static int SctMatchNode(void *vNode, void *vData)
{
  Hdb *node = vNode;
  SctData *d = vData;

  return node == d->node;
}

/*
 * This is the read callback for nodes participating in the 
 * scriptcontext system
 */
static hdbCallbackReturn SctMainCallback(Hdb * node, void *userData,
                                         hdbMessage * msg)
{
  SctController *controller = userData;
  hdbDataSearch *dsm;
  hdbDataMessage *mm;
  hdbPtrMessage *pm;
  hdbMessage *km;
  ContextItem *s;
  SConnection *con;
  char *geterror;
  char error[256];

  if (controller->devser == NULL) {
    /* defunct controller */
    return hdbContinue;
  }
  pm = GetKillPtrMessage(msg);
  if (pm != NULL) {
    if (controller == pm->pPtr) {
      return hdbKill;
    }
    return hdbContinue;
  }
  dsm = GetHdbDataSearchMessage(msg);
  if (dsm != NULL) {
    if (dsm->testPtr == controller) {
      dsm->result = controller;
      return hdbAbort;
    }
    return hdbContinue;
  }
  km = GetHdbKillNodeMessage(msg);
  if (km != NULL) {
    /* unschedule all actions related to this node */
    DevUnschedule(controller->devser, node, SctActionHandler,
                  SctMatchNode);
    CleanStack(node);
    return hdbContinue;
  }
  mm = GetHdbGetMessage(msg);
  if (mm != NULL) {
    con = mm->callData;
    geterror = GetHdbProp(node, "geterror");
    if (geterror != NULL) {
      snprintf(error,255,"ERROR: %s", geterror); 
      SCWrite(con, error, eError);
      if(mm->v->dataType == HIPTEXT){
	if(mm->v->v.text != NULL){
	  free(mm->v->v.text);
	}
	mm->v->v.text = strdup(error);
      }
      return hdbAbort;
    }
    return hdbContinue;
  }

  return hdbContinue;
}
/*
 * This is the callback registered for nodes which 
 * are written too.
 */ 
static hdbCallbackReturn SctActionCallback(Hdb * node, void *userData,
                                           hdbMessage * msg)
{
  hdbDataSearch *dsm;
  hdbDataMessage *mm;
  hdbPtrMessage *pm;
  hdbMessage *km;
  SctData *data = userData;
  Hdb *target;
  char *script;
  int l;
  int iRet;
  pDynString text;
  DevPrio prio;
  char *writeprio;
  char *error;
  SConnection *con;
  char path[MAX_HDB_PATH];
  char *sicsCommand;
  int iMacro;
  
  pm = GetKillPtrMessage(msg);
  if (pm != NULL) {
    if (data->controller == pm->pPtr) {
      return hdbKill;
    }
    return hdbContinue;
  }
  dsm = GetHdbDataSearchMessage(msg);
  if (dsm != NULL) {
    if (dsm->testPtr == &actionCallback) {
      if (strcasecmp(data->name, actionCallback.name) == 0) {
        dsm->result = data;
      }
      return hdbAbort;
    }
    return hdbContinue;
  }

  mm = GetHdbSetMessage(msg);
  if (mm != NULL) {
    con = mm->callData;

    /* set target value */
    text = formatValue(*(mm->v), node);
    SetHdbProperty(node, "target", GetCharArray(text));

    /* call check script, if available */
    script = GetProp(node, data->controller->node, "check");
    if (script != NULL) {
      if (SctCallInContext(con, script, node, data->controller, &error) ==
          0) {
        SCPrintf(con, eError, "ERROR: in {%s}: %s", script, error);
        SetHdbProperty(node, "target", NULL);
        return hdbAbort;
      }
    }


    /* enqueue write action */
    writeprio = GetProp(node, data->controller->node, "writeprio");
    if (writeprio != NULL) {
      prio = DevText2Prio(writeprio);
      if (prio == NullPRIO) {
        SCPrintf(con, eError, "ERROR: unknown priority: %s", writeprio);
        prio = WritePRIO;
      }
    } else {
      prio = WritePRIO;
    }

    /* 
     * check for duplicate sets on a node.
     */
    if (data->conCtx != NULL) {
      if (data->inMacro == 0) {
        GetHdbPath(node, path, sizeof path);
        SCsetMacro(data->conCtx, 0);
        SCPrintf(data->conCtx, eWarning,
                 "%s target changed to %s before completion", path,
                 GetCharArray(text));
      }
      /*
       * the node has already been queued for execution. But as we never 
       * know if the script chain is already running, the only clean
       * solution is to requeue the node.
       */
      SCDeleteConnection(data->conCtx);
    }
    DeleteDynString(text);
    data->conCtx = SCCopyConnection(con);
    data->answered = 0;
    data->inMacro = SCinMacro(con);
    DevQueue(data->controller->devser, data, prio,
             SctWriteHandler, SctMatch, NULL);
    /* no kill function in DevQueue: data is owned by the node (callback list) */
    return hdbContinue;
  }

  mm = GetHdbUpdateMessage(msg);
  if (mm != NULL) {
    if (queueData != NULL && queueData->conCtx != NULL && queueData->answered != 1) {
      /* update called from a write action */
      text = formatValue(*(mm->v), node);
      if (queueData->inMacro == 0 && queueData->node == node) {
        queueData->answered = 1;
        iMacro = SCinMacro(queueData->conCtx);
        SCsetMacro(queueData->conCtx, 0);
        sicsCommand = GetHdbProp(node, "sicscommand");
        if (sicsCommand) {
          SCPrintf(queueData->conCtx, eWarning, "OK: %s %s", sicsCommand, GetCharArray(text));
        } else {
          GetHdbPath(node, path, sizeof path);
          SCPrintf(queueData->conCtx, eWarning, "OK: hset %s %s", path, GetCharArray(text));
        }
        SCsetMacro(queueData->conCtx, iMacro);
      }
      DeleteDynString(text);
    }
    return hdbContinue;
  }
  return hdbContinue;
}

static char *ParText(Hdb * cmdNode, char *name,
                     int nPar, char *defaultValue)
{
  Hdb *par;

  for (par = cmdNode->child; nPar > 0 && par != NULL;
       par = par->next, nPar--) {
    if (strcasecmp(par->name, name) == 0) {
      if (par->value.dataType == HIPTEXT) {
        return par->value.v.text;
      }
    }
  }
  return defaultValue;
}

static double ParValue(Hdb * cmdNode, char *name,
                       int nPar, double defaultValue)
{
  Hdb *par;

  for (par = cmdNode->child; nPar > 0 && par != NULL;
       par = par->next, nPar--) {
    if (strcasecmp(par->name, name) == 0) {
      switch (par->value.dataType) {
      case HIPINT:
        return par->value.v.intValue;
      case HIPFLOAT:
        return par->value.v.doubleValue;
      }
    }
  }
  return defaultValue;
}

static void SctKillData(void *d)
{
  SctData *data = d;

  if (data->name)
    free(data->name);
  if (data->conCtx)
    SCDeleteConnection(data->conCtx);
  free(data);
}

static void SctKillCBData(void *d)
{
  SctData *data = d;

  if (data->controller->devser != NULL) {
    DevRemoveAction(data->controller->devser, data);
  }
  SctKillData(d);
}

int SctAddPollNode(SctController * controller, Hdb * node, double interval,
                   DevPrio prio, char *action)
{
  SctData *data;
  hdbCallback *cb;

  if (!FindHdbCallbackData(node, controller)) {
    cb = MakeHipadabaCallback(SctMainCallback, controller, NULL);
    assert(cb);
    AppendHipadabaCallback(node, cb);
    SetHdbProperty(node, "geterror", "Not read yet");
  }

  data = calloc(1, sizeof(*data));
  assert(data);
  data->controller = controller;
  data->node = node;
  data->conCtx = NULL;          /* we might need a dummy connection here */
  data->name = strdup(action);

  return DevSchedule(controller->devser, data, prio, interval,
                     SctActionHandler, SctMatch, SctKillData);

}

static int SctPollCmd(pSICSOBJ ccmd, SConnection * con,
                      Hdb * cmdNode, Hdb * par[], int nPar)
{
  Hdb *node;
  SctController *controller;
  double interval;
  char *path;
  DevPrio prio;
  char *action;
  char *prioText;

  if (nPar < 1) {
    SCPrintf(con, eError,
             "ERROR: should be:  %s poll <node> (<interval> <prio> <action>)",
             ccmd->objectNode->name);
    return 0;
  }
  controller = ccmd->pPrivate;
  path = ParText(cmdNode, "node", nPar, "");
  node = FindHdbNode(NULL, path, con);
  if (node == NULL) {
    SCPrintf(con, eError, "ERROR: %s not found", path);
    return 0;
  }
  interval = ParValue(cmdNode, "interval", nPar, 5);
  prioText = ParText(cmdNode, "prio", nPar, "read");
  prio = DevText2Prio(prioText);
  if (prio == NullPRIO) {
    SCPrintf(con, eError, "ERROR: unknown priority: %s", prioText);
    return 0;
  }
  action = ParText(cmdNode, "action", nPar, "read");

  if (SctAddPollNode(controller, node, interval, prio, action) > 0) {
    SCPrintf(con, eValue,
             "%s poll on %s changed to %g sec, %s prio",
             action, path, interval, prioText);
  } else {
    SCPrintf(con, eValue,
             "%s poll registered on %s (%g sec, %s prio)",
             action, path, interval, prioText);
  }
  return 1;
}

static int SctUnpollCmd(pSICSOBJ ccmd, SConnection * con,
                        Hdb * cmdNode, Hdb * par[], int nPar)
{
  SctController *controller;
  double interval;
  char *path;
  DevPrio prio;
  char *prioText;
  SctData data;

  if (nPar < 1) {
    SCPrintf(con, eError,
             "ERROR: should be:  %s unpoll <node> (<action>)",
             ccmd->objectNode->name);
    return 0;
  }
  controller = ccmd->pPrivate;
  path = ParText(cmdNode, "node", nPar, "");
  data.node = FindHdbNode(NULL, path, con);
  if (data.node == NULL) {
    SCPrintf(con, eError, "ERROR: %s not found", path);
    return 0;
  }
  data.name = ParText(cmdNode, "action", nPar, "read");
  if (DevUnschedule(controller->devser, &data, SctActionHandler, SctMatch)
      == 0) {
    SCPrintf(con, eValue, "%s poll not found on %s", data.name, path);
  } else {
    SCSendOK(con);
  }
  return 1;
}

static int SctConnectCmd(pSICSOBJ ccmd, SConnection * con,
                         Hdb * cmdNode, Hdb * par[], int nPar)
{
  Hdb *node;
  SctController *controller;
  char *path;
  hdbCallback *cb;

  if (nPar < 1) {
    SCPrintf(con, eError,
             "ERROR: should be:  %s connect <node> ",
             ccmd->objectNode->name);
    return 0;
  }
  controller = ccmd->pPrivate;
  path = ParText(cmdNode, "node", nPar, "");
  node = FindHdbNode(NULL, path, con);
  if (node == NULL) {
    SCPrintf(con, eError, "ERROR: %s not found", path);
    return 0;
  }

  if (!FindHdbCallbackData(node, controller)) {
    cb = MakeHipadabaCallback(SctMainCallback, controller, NULL);
    assert(cb);
    AppendHipadabaCallback(node, cb);
  }
  SCSendOK(con);
  return 1;
}

int SctAddWriteNode(SctController * controller, Hdb * node)
{
  hdbCallback *cb;
  SctData *data;

  if (!FindHdbCallbackData(node, controller)) {
    cb = MakeHipadabaCallback(SctMainCallback, controller, NULL);
    assert(cb);
    AppendHipadabaCallback(node, cb);
  }

  actionCallback.name = "write";        /* local, so no strdup here */
  data = FindHdbCallbackData(node, &actionCallback);
  if (data != NULL) {
    return 0;
  }
  data = calloc(1, sizeof(*data));
  assert(data);
  data->controller = controller;
  data->node = node;
  data->conCtx = NULL;
  data->name = strdup("write");

  cb = MakeHipadabaCallback(SctActionCallback, data, SctKillCBData);
  assert(cb);
  data->node = node;
  AppendHipadabaCallback(node, cb);
  RemoveSetUpdateCallback(node);
  return 1;
}

static int SctWriteCmd(pSICSOBJ ccmd, SConnection * con,
                       Hdb * cmdNode, Hdb * par[], int nPar)
{
  Hdb *node;
  SctController *controller;
  double interval;
  char *path;

  if (nPar < 1) {
    SCPrintf(con, eError, "ERROR: should be:  %s write <node>",
             ccmd->objectNode->name);
    return 0;
  }
  controller = ccmd->pPrivate;
  path = ParText(cmdNode, "node", nPar, "");
  node = FindHdbNode(NULL, path, con);
  if (node == NULL) {
    SCPrintf(con, eError, "ERROR: %s not found", path);
    return 0;
  }
  if (SctAddWriteNode(controller, node) == 0) {
    SCPrintf(con, eError, "ERROR: %s has already a write action", path);
    return 0;
  }

  SCSendOK(con);
  return 1;
}

void SctQueueNode(SctController * controller, Hdb * node,
                  DevPrio prio, char *action, SConnection * con)
{
  SctData *data;
  hdbCallback *cb;

  /*
   * The test for read below is questionable. If this becomes a problem 
   * take it out and tell Mark and Markus about the fact.
   */ 
  if (!FindHdbCallbackData(node, controller) && strcmp(action,"read") == 0) {
    cb = MakeHipadabaCallback(SctMainCallback, controller, NULL);
    assert(cb);
    AppendHipadabaCallback(node, cb);
  }

  data = calloc(1, sizeof(*data));
  assert(data);
  data->controller = controller;
  data->node = node;
  data->name = strdup(action);
  data->conCtx = NULL;
  data->answered = 1;
  
  if (!DevQueue(data->controller->devser, data, prio,
                SctWriteHandler, SctMatch, SctKillData)) {
    if (data->name != NULL) {
      free(data->name);
    }
    free(data);
  } else {
    if (con != NULL) {
      data->conCtx = SCCopyConnection(con);
    }
  }
  return;
}

static int SctQueueCmd(pSICSOBJ ccmd, SConnection * con,
                       Hdb * cmdNode, Hdb * par[], int nPar)
{
  Hdb *node;
  SctController *controller;
  double interval;
  char *path;
  char *action;
  DevPrio prio;
  SctData *data;
  char *prioText;

  if (nPar < 2) {
    SCPrintf(con, eError,
             "ERROR: should be:  %s queue <node> <prio> <action>",
             ccmd->objectNode->name);
    return 0;
  }
  controller = ccmd->pPrivate;
  path = ParText(cmdNode, "node", nPar, "");
  node = FindHdbNode(NULL, path, con);
  if (node == NULL) {
    SCPrintf(con, eError, "ERROR: %s not found", path);
    return 0;
  }
  prioText = ParText(cmdNode, "prio", nPar, "write");
  prio = DevText2Prio(prioText);
  if (prio == NullPRIO) {
    SCPrintf(con, eError, "ERROR: unknown priority: %s", prioText);
    return 0;
  }
  action = ParText(cmdNode, "action", nPar, "write");

  SctQueueNode(controller, node, prio, action, con);
  return 1;
}

typedef struct SctTransact {
  char *command;
  int sent;
  SConnection *con;
} SctTransact, *pSctTransact;

static void KillSctTransact(void *data)
{
  pSctTransact self = (pSctTransact) data;
  if (self == NULL) {
    return;
  }
  if (self->command) {
    free(self->command);
  }
  if (self->con) {
    SCDeleteConnection(self->con);
  }
  free(self);
}

static char *TransactionHandler(void *actionData, char *lastReply,
                                int commError)
{
  pSctTransact st = (pSctTransact) actionData;

  if (st->sent == 0) {
    st->sent = 1;
    return st->command;
  } else {
    st->sent = 2;
    SCWrite(st->con, lastReply, eValue);
    return NULL;
  }
}
static int SctTransactMatch(void *d1, void *d2)
{
  return d1 == d2;
}

static int SctTransactCmd(pSICSOBJ ccmd, SConnection * con,
                          Hdb * cmdNode, Hdb * par[], int nPar)
{
  pSctTransact st = NULL;
  SctController *c;

  c = (SctController *) ccmd->pPrivate;

  st = calloc(sizeof(SctTransact), 1);
  if (st == NULL) {
    SCWrite(con, "ERROR: out of memory in SctTransactCommand", eError);
    return 0;
  }
  st->con = SCCopyConnection(con);
  st->command = strdup(par[0]->value.v.text);

  DevQueue(c->devser, st, WritePRIO,
           TransactionHandler, SctTransactMatch, NULL);
  while (st->sent != 2) {
    TaskYield(pServ->pTasker);
    if (SCGetInterrupt(con) != eContinue) {
      break;
    }
  }
  KillSctTransact(st);
  return 1;
}

static int SctSendCmd(pSICSOBJ ccmd, SConnection * con,
                      Hdb * cmdNode, Hdb * par[], int nPar)
{
  pSctTransact st = NULL;
  SctController *c;
  char *prioText = NULL;
  int prio;

  c = (SctController *) ccmd->pPrivate;

  st = calloc(sizeof(SctTransact), 1);
  if (st == NULL) {
    SCWrite(con, "ERROR: out of memory in SctSendCmd", eError);
    return 0;
  }
  st->con = SCCopyConnection(con);
  st->command = strdup(par[0]->value.v.text);

  prioText = ParText(cmdNode, "prio", nPar, "write");
  prio = DevText2Prio(prioText);
  if (prio == NullPRIO) {
    prio = WritePRIO;
  }

  DevQueue(c->devser, st, prio,
           TransactionHandler, SctTransactMatch, KillSctTransact);
  return 1;
}

static int SctDisconnect(pSICSOBJ ccmd, SConnection * con,
                         Hdb * cmdNode, Hdb * par[], int nPar)
{
  SctController *c;

  c = (SctController *) ccmd->pPrivate;
  DevDisconnect(c->devser);
  return 1;
}

static hdbCallbackReturn SctDebugCallback(Hdb * node, void *userData,
                                          hdbMessage * msg)
{
  hdbDataMessage *mm;
  SctController *controller = userData;
  SConnection *con;
  int i;

  mm = GetHdbSetMessage(msg);
  if (mm != NULL) {
    i = mm->v->v.intValue;
    if (i < 0) {
      controller->verbose = 0;
      DevDebugMode(controller->devser, -1);
    } else if (i == 0) {
      controller->verbose = 1;
      DevDebugMode(controller->devser, -1);
    } else {
      controller->verbose = 1;
      DevDebugMode(controller->devser, i);
    }
  }
  return hdbContinue;
}

static void SctDeferredFree(void *data)
{
  free(data);
  return;
}

static int SctDeferredTask(void *data)
{
  return 0;
}

static void SctKillController(void *c)
{
  SctController *controller = c;
  SConnection *con;

  CleanStack(controller->node);
  RemoveSICSInternalCallback(controller);
  if (controller->conn) {
    SCDeleteConnection(controller->conn);
  }
  DevKill(controller->devser);
  controller->devser = NULL;
  if (pServ->pTasker) {
    TaskRegister(pServ->pTasker, SctDeferredTask, NULL, SctDeferredFree,
                 controller, 0);
  } else {
    free(controller);
  }
}

static int SctMakeController(SConnection * con, SicsInterp * sics,
                             void *object, int argc, char *argv[])
{
  SICSOBJ *ccmd;
  Hdb *parent, *par, *cmd;
  char *objName;
  hdbCallback *cb;
  SctController *controller;

  if (argc < 2) {
    SCPrintf(con, eError,
             "ERROR: should be  %s <path or objectname> <protocol args> ...",
             argv[0]);
    return 0;
  }

  if (strchr(argv[1], '/') == NULL) {
    /* object name only -> do not anchor in tree */
    parent = NULL;
    objName = argv[1];
  } else {
    /* full path given -> install into the hipadaba */
    parent = FindHdbParent(NULL, argv[1], &objName, con);
    if (parent == NULL)
      return 0;                 /* error message already written */
  }

  controller = calloc(1, sizeof(*controller));
  assert(controller);
  controller->verbose = 0;

  ccmd = MakeSICSOBJv(objName, "SctController", HIPNONE, usSpy);
  controller->node = ccmd->objectNode;
  controller->conn = SCCreateDummyConnection(pServ->pSics);

  assert(ccmd);
  assert(controller->node->mama == NULL);
  ccmd->pPrivate = controller;
  ccmd->KillPrivate = SctKillController;

  if (parent != NULL) {
    AddHipadabaChild(parent, controller->node, con);
  }

  controller->devser = DevMake(con, argc - 2, argv + 2);
  if (!controller->devser)
    return 0;

  SetHdbProperty(controller->node, "controllerName", objName);
  SetHdbProperty(controller->node, "sicsdev", objName);
  
  AddCommand(pServ->pSics, objName, InterInvokeSICSOBJ, KillSICSOBJ, ccmd);
  RegisterSICSOBJKillCmd(ccmd, objName);
  SetDescriptorKey(ccmd->pDes, "creationCommand", "0");

  cmd = AddSICSHdbPar(controller->node,
                      "poll", usMugger, MakeSICSFunc(SctPollCmd));
  AddSICSHdbPar(cmd, "node", usMugger, MakeHdbText(""));
  AddSICSHdbPar(cmd, "interval", usMugger, MakeHdbFloat(5.0));
  AddSICSHdbPar(cmd, "prio", usMugger, MakeHdbText("read"));
  AddSICSHdbPar(cmd, "action", usMugger, MakeHdbText("read"));

  cmd = AddSICSHdbPar(controller->node,
                      "unpoll", usMugger, MakeSICSFunc(SctUnpollCmd));
  AddSICSHdbPar(cmd, "node", usMugger, MakeHdbText(""));
  AddSICSHdbPar(cmd, "action", usMugger, MakeHdbText("read"));

  cmd = AddSICSHdbPar(controller->node,
                      "connect", usMugger, MakeSICSFunc(SctConnectCmd));
  AddSICSHdbPar(cmd, "node", usMugger, MakeHdbText(""));

  cmd = AddSICSHdbPar(controller->node,
                      "write", usMugger, MakeSICSFunc(SctWriteCmd));
  AddSICSHdbPar(cmd, "node", usMugger, MakeHdbText(""));


  cmd = AddSICSHdbPar(controller->node,
                      "queue", usMugger, MakeSICSFunc(SctQueueCmd));
  AddSICSHdbPar(cmd, "node", usMugger, MakeHdbText(""));
  AddSICSHdbPar(cmd, "prio", usMugger, MakeHdbText("write"));
  AddSICSHdbPar(cmd, "action", usMugger, MakeHdbText("write"));

  cmd = AddSICSHdbPar(controller->node,
                      "transact", usMugger, MakeSICSFunc(SctTransactCmd));
  AddSICSHdbPar(cmd, "data", usMugger, MakeHdbText(""));

  cmd = AddSICSHdbPar(controller->node,
                      "send", usMugger, MakeSICSFunc(SctSendCmd));
  AddSICSHdbPar(cmd, "data", usMugger, MakeHdbText(""));
  AddSICSHdbPar(cmd, "prio", usMugger, MakeHdbText(""));

  cmd = AddSICSHdbPar(controller->node,
                      "disconnect", usMugger, MakeSICSFunc(SctDisconnect));

  par = AddSICSHdbPar(controller->node, "debug", usUser, MakeHdbInt(-1));

  cb = MakeHipadabaCallback(SctDebugCallback, controller, NULL);
  if (cb)
    AppendHipadabaCallback(par, cb);

  return 1;
}

void SctKill(void *object)
{
  assert(sct == object);
  ContextItem *p, *q;

  for (p = sct->nodes; p != NULL; p = q) {
    q = p->next;
    free(p);
  }
  for (p = sct->trash; p != NULL; p = q) {
    q = p->next;
    free(p);
  }
  if (sct->desc != NULL) {
    DeleteDescriptor(sct->desc);
  }
  free(sct);
  sct = NULL;
}

void SctInit(void)
{
  if (sct)
    return;
  sct = calloc(1, sizeof(*sct));
  assert(sct);
  sct->desc = CreateDescriptor("ScriptContext");
  AddCommand(pServ->pSics, "sct", SctCommand, SctKill, sct);
  AddCmd("makesctcontroller", SctMakeController);
}

int SctVerbose(SctController * c)
{
  return c->verbose;
}