/*
 *  © 2020,2021 Chris Harlow. All rights reserved.
 *  
 *  This file is part of CommandStation-EX
 *
 *  This 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  It 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 CommandStation.  If not, see <https://www.gnu.org/licenses/>.
 */

/* EXRAILPlus planned FEATURE additions
   F1. [DONE] DCC accessory packet opcodes (short and long form)
   F2. [DONE] ONAccessory catchers 
   F3. [DONE] Turnout descriptions for Withrottle
   F4. Oled announcements (depends on HAL)
   F5. Withrottle roster info
   F6. Multi-occupancy semaphore
   F7. [DONE see AUTOSTART] Self starting sequences
   F8. Park/unpark
   F9.  [DONE] Analog drive
   F10. [DONE] Alias anywhere
   F11. [DONE]EXRAIL/ENDEXRAIL unnecessary
   F12. [DONE] Allow guarded code (as effect of ALIAS anywhere)
   F13. [DONE] IFGTE/IFLT function  
  */
/* EXRAILPlus planned TRANSPARENT additions
   T1. [DONE] RAM based fast lookup for sequences ON* event catchers and signals.
   T2. Extend to >64k
  */


#include <Arduino.h>
#include "RMFT2.h"
#include "DCC.h"
#include "DCCWaveform.h"
#include "DIAG.h"
#include "WiThrottle.h"
#include "DCCEXParser.h"
#include "Turnouts.h"
#include "CommandDistributor.h"


// Command parsing keywords
const int16_t HASH_KEYWORD_EXRAIL=15435;    
const int16_t HASH_KEYWORD_ON = 2657;
const int16_t HASH_KEYWORD_START=23232;
const int16_t HASH_KEYWORD_RESERVE=11392;
const int16_t HASH_KEYWORD_FREE=-23052;
const int16_t HASH_KEYWORD_LATCH=1618;  
const int16_t HASH_KEYWORD_UNLATCH=1353;
const int16_t HASH_KEYWORD_PAUSE=-4142;
const int16_t HASH_KEYWORD_RESUME=27609;
const int16_t HASH_KEYWORD_KILL=5218;
const int16_t HASH_KEYWORD_ROUTES=-3702;

// One instance of RMFT clas is used for each "thread" in the automation.
// Each thread manages a loco on a journey through the layout, and/or may manage a scenery automation.
// The thrrads exist in a ring, each time through loop() the next thread in the ring is serviced.

// Statics 
const int16_t LOCO_ID_WAITING=-99; // waiting for loco id from prog track
int16_t RMFT2::progtrackLocoId;  // used for callback when detecting a loco on prograck
bool RMFT2::diag=false;      // <D EXRAIL ON>  
RMFT2 * RMFT2::loopTask=NULL; // loopTask contains the address of ONE of the tasks in a ring.
RMFT2 * RMFT2::pausingTask=NULL; // Task causing a PAUSE.
 // when pausingTask is set, that is the ONLY task that gets any service,
 // and all others will have their locos stopped, then resumed after the pausing task resumes.
byte RMFT2::flags[MAX_FLAGS];

LookList *  RMFT2::sequenceLookup=NULL;
LookList *  RMFT2::signalLookup=NULL;
LookList *  RMFT2::onThrowLookup=NULL;
LookList *  RMFT2::onCloseLookup=NULL;
LookList *  RMFT2::onActivateLookup=NULL;
LookList *  RMFT2::onDeactivateLookup=NULL;

#define GET_OPCODE GETFLASH(RMFT2::RouteCode+progCounter)
#define GET_OPERAND(n) GETFLASHW(RMFT2::RouteCode+progCounter+1+(n*3))
#define SKIPOP progCounter+=3


   LookList::LookList(int16_t size) {
     m_size=size;
     m_loaded=0;
     if (size) {
       m_lookupArray=new int16_t[size];
       m_resultArray=new int16_t[size];
     }    
   } 
   
   void LookList::add(int16_t lookup, int16_t result) {
     if (m_loaded==m_size) return; // and forget
     m_lookupArray[m_loaded]=lookup;
     m_resultArray[m_loaded]=result;
     m_loaded++;     
   }
   
   int16_t LookList::find(int16_t value) {
     for (int16_t i=0;i<m_size;i++) {
       if (m_lookupArray[i]==value) return m_resultArray[i];
     }
     return -1; 
   }

/* static */ void RMFT2::begin() { 
  DCCEXParser::setRMFTFilter(RMFT2::ComandFilter);
  for (int f=0;f<MAX_FLAGS;f++) flags[f]=0;
  int progCounter;
  
  // counters to create lookup arrays 
  int sequenceCount=0; // to allow for seq 0 at start 
  int onThrowCount=0;
  int onCloseCount=0;
  int onActivateCount=0;
  int onDeactivateCount=0;
  int signalCount=0;

  // first pass count sizes for fast lookup arrays
  for (progCounter=0;; SKIPOP) {
     byte opcode=GET_OPCODE;
     if (opcode==OPCODE_ENDEXRAIL) break;
     switch (opcode) {
     case OPCODE_SIGNAL: 
        signalCount++; 
        break;
      
     case OPCODE_ROUTE: 
     case OPCODE_AUTOMATION:
     case OPCODE_SEQUENCE:
        sequenceCount++;
        break;
     
     case OPCODE_ONTHROW: 
        onThrowCount++;
        break;
     
     case OPCODE_ONCLOSE: 
        onCloseCount++;
        break;

     case OPCODE_ONACTIVATE: 
        onActivateCount++;
        break;

     case OPCODE_ONDEACTIVATE: 
        onDeactivateCount++;
        break;

     default: // Ignore  
      break;  
     }     
  } 
  
  // create lookups
  sequenceLookup=new LookList(sequenceCount);
  signalLookup=new LookList(signalCount);
  onThrowLookup=new LookList(onThrowCount);
  onCloseLookup=new LookList(onCloseCount);
  onActivateLookup=new LookList(onActivateCount);
  onDeactivateLookup=new LookList(onDeactivateCount);
         
  // Second pass startup, define any turnouts or servos, set signals red
  // add signals, sequences onRoutines to the lookups 
  for (progCounter=0;; SKIPOP){
     byte opcode=GET_OPCODE;
     if (opcode==OPCODE_ENDEXRAIL) break;
     VPIN operand=GET_OPERAND(0);
     
     switch (opcode) {
     case OPCODE_AT:
     case OPCODE_AFTER:
     case OPCODE_IF:
     case OPCODE_IFNOT: {
       int16_t pin = (int16_t)operand;
       if (pin<0) pin = -pin;
       IODevice::configureInput((VPIN)pin,true);
       break;
     }
     

     case OPCODE_SIGNAL: {
      VPIN red=operand;
      VPIN amber=GET_OPERAND(1);
      VPIN green=GET_OPERAND(2);
      IODevice::write(red,true);
      if (amber) IODevice::write(amber,false);
      IODevice::write(green,false);
      signalLookup->add(red,progCounter); 
      break;
     }
     
     case OPCODE_TURNOUT: {
      VPIN id=operand;
      int addr=GET_OPERAND(1);
      byte subAddr=GET_OPERAND(2);
      DCCTurnout::create(id,addr,subAddr);
      break;
     }

     case OPCODE_SERVOTURNOUT: {
      VPIN id=operand;
      VPIN pin=GET_OPERAND(1);
      int activeAngle=GET_OPERAND(2);
      int inactiveAngle=GET_OPERAND(3);
      int profile=GET_OPERAND(4);
      ServoTurnout::create(id,pin,activeAngle,inactiveAngle,profile);
      break;
     }

     case OPCODE_PINTURNOUT: {
      VPIN id=operand;
      VPIN pin=GET_OPERAND(1);
      VpinTurnout::create(id,pin);
      break;
     }

     case OPCODE_ROUTE: 
     case OPCODE_AUTOMATION:
     case OPCODE_SEQUENCE:
          sequenceLookup->add(operand,progCounter);
          break;
     
     case OPCODE_ONTHROW: 
        onThrowLookup->add(operand,progCounter);
        break;
     
     case OPCODE_ONCLOSE: 
        onCloseLookup->add(operand,progCounter);
        break;

     case OPCODE_ONACTIVATE: 
        onActivateLookup->add(operand,progCounter);
        break;

     case OPCODE_ONDEACTIVATE: 
        onDeactivateLookup->add(operand,progCounter);
        break;

     case OPCODE_AUTOSTART:
         // automatically create a task from here at startup. 
         new RMFT2(progCounter);
         break;

     default: // Ignore   
      break; 
     }     
  } 
  SKIPOP; // include ENDROUTES opcode
  
  DIAG(F("EXRAIL %db, fl=%d seq=%d, sig=%d, onT=%d, onC=%d"),
        progCounter,MAX_FLAGS,
        sequenceCount, signalCount, onThrowCount, onCloseCount);
        
  new RMFT2(0); // add the startup route
}

// This filter intercepts <> commands to do the following:
// - Implement RMFT specific commands/diagnostics 
// - Reject/modify JMRI commands that would interfere with RMFT processing 
void RMFT2::ComandFilter(Print * stream, byte & opcode, byte & paramCount, int16_t p[]) {
    (void)stream; // avoid compiler warning if we don't access this parameter 
    bool reject=false;
    switch(opcode) {
        
     case 'D':
        if (p[0]==HASH_KEYWORD_EXRAIL) { // <D EXRAIL ON/OFF>
           diag = paramCount==2 && (p[1]==HASH_KEYWORD_ON || p[1]==1);
           opcode=0;
        }
        break;
          
     case '/':  // New EXRAIL command
          reject=!parseSlash(stream,paramCount,p);
          opcode=0;
          break;
          
     default:  // other commands pass through 
     break;       
   }
 if (reject) {
   opcode=0;
   StringFormatter::send(stream,F("<X>"));
   }
}
     
bool RMFT2::parseSlash(Print * stream, byte & paramCount, int16_t p[]) {

          if (paramCount==0) { // STATUS
                 StringFormatter::send(stream, F("<* EXRAIL STATUS"));
                 RMFT2 * task=loopTask;
                 while(task) {
                   StringFormatter::send(stream,F("\nID=%d,PC=%d,LOCO=%d%c,SPEED=%d%c"),
                         (int)(task->taskId),task->progCounter,task->loco,
                         task->invert?'I':' ',
                         task->speedo, 
                         task->forward?'F':'R'
                         );
                   task=task->next;      
                   if (task==loopTask) break;      
                 }
                 // Now stream the flags 
                 for (int id=0;id<MAX_FLAGS; id++) {
                   byte flag=flags[id];
                   if (flag & ~TASK_FLAG) { // not interested in TASK_FLAG only. Already shown above 
                     StringFormatter::send(stream,F("\nflags[%d} "),id);
                     if (flag & SECTION_FLAG) StringFormatter::send(stream,F(" RESERVED"));
                     if (flag & LATCH_FLAG) StringFormatter::send(stream,F(" LATCHED"));
                     }                 
                 }
                 StringFormatter::send(stream,F(" *>\n"));
                 return true;
            }
          switch (p[0]) {
            case HASH_KEYWORD_PAUSE: // </ PAUSE>
                 if (paramCount!=1) return false;
                 DCC::setThrottle(0,1,true);  // pause all locos on the track         
                 pausingTask=(RMFT2 *)1; // Impossible task address
                 return true;
                 
            case HASH_KEYWORD_RESUME: // </ RESUME>
                 if (paramCount!=1) return false;
                 pausingTask=NULL;
                 {
                  RMFT2 * task=loopTask;                 
                  while(task) {
                      if (task->loco) task->driveLoco(task->speedo);
                      task=task->next;      
                      if (task==loopTask) break;      
                    }
                 }        
                 return true;
                 
                      
            case HASH_KEYWORD_START: // </ START [cab] route >
                 if (paramCount<2 || paramCount>3) return false;
                 {
                  int route=(paramCount==2) ? p[1] : p[2];
                  uint16_t cab=(paramCount==2)? 0 : p[1];
                  int pc=sequenceLookup->find(route);                 
                  if (pc<0) return false;
                    RMFT2* task=new RMFT2(pc);
                    task->loco=cab;                    
                 }
              return true;

            case HASH_KEYWORD_ROUTES: // </ ROUTES > JMRI withrottle support 
                 if (paramCount>1) return false;
                 StringFormatter::send(stream,F("</ROUTES "));
                 emitWithrottleRouteList(stream);                                  
                 StringFormatter::send(stream,F(">"));
              return true;
              
            default:
              break;
          }
          
          // all other / commands take 1 parameter 0 to MAX_FLAGS-1     

          if (paramCount!=2 || p[1]<0  || p[1]>=MAX_FLAGS) return false;

          switch (p[0]) {  
               case HASH_KEYWORD_KILL: // Kill taskid
                    {
                    RMFT2 * task=loopTask;
                    while(task) {
                      if (task->taskId==p[1]) {
                         delete task;
                         return  true;
                      }
                      task=task->next;      
                      if (task==loopTask) break;      
                    }
                 }
                 return false;
                    
            case HASH_KEYWORD_RESERVE:  // force reserve a section
                 setFlag(p[1],SECTION_FLAG);
                 return true;
    
            case HASH_KEYWORD_FREE:  // force free a section
                 setFlag(p[1],0,SECTION_FLAG);
                 return true;
                
            case HASH_KEYWORD_LATCH:
                 setFlag(p[1], LATCH_FLAG);
                 return true;
   
            case HASH_KEYWORD_UNLATCH:
                 setFlag(p[1], 0, LATCH_FLAG);
                 return true;
                  
            default:
                 return false;                 
          }
    }


// This emits Routes and Automations to Withrottle
// Automations are given a state to set the button to "handoff" which implies 
// handing over the loco to the automation.
// Routes are given "Set" buttons and do not cause the loco to be handed over. 
void RMFT2::emitWithrottleRouteList(Print* stream) {
   StringFormatter::send(stream,F("PRT]\\[Routes}|{Route]\\[Set}|{2]\\[Handoff}|{4\nPRL"));
   emitWithrottleDescriptions(stream);
   StringFormatter::send(stream,F("\n"));
}


RMFT2::RMFT2(int progCtr) {
  progCounter=progCtr;

  // get an unused  task id from the flags table 
  taskId=255; // in case of overflow
  for (int f=0;f<MAX_FLAGS;f++) {
    if (!getFlag(f,TASK_FLAG)) {
      taskId=f;
      setFlag(f, TASK_FLAG);
      break;
    }
  }
  delayTime=0;
  loco=0;
  speedo=0;
  forward=true;
  invert=false;
  stackDepth=0;
  onTurnoutId=0; // Not handling an ONTHROW/ONCLOSE
   
  // chain into ring of RMFTs
  if (loopTask==NULL) {
    loopTask=this;
    next=this;
  }
  else {
        next=loopTask->next;
        loopTask->next=this;
  }
}


RMFT2::~RMFT2() {
  driveLoco(1); // ESTOP my loco if any 
  setFlag(taskId,0,TASK_FLAG); // we are no longer using this id
  if (next==this) loopTask=NULL;
  else for (RMFT2* ring=next;;ring=ring->next) if (ring->next == this) {
           ring->next=next;
           loopTask=next;
           break;
       }
}

void RMFT2::createNewTask(int route, uint16_t cab) {
      int pc=sequenceLookup->find(route);
      if (pc<0) return;
      RMFT2* task=new RMFT2(pc);
      task->loco=cab;
}

void RMFT2::driveLoco(byte speed) {
     if (loco<=0) return;  // Prevent broadcast! 
     if (diag) DIAG(F("EXRAIL drive %d %d %d"),loco,speed,forward^invert);
     if (DCCWaveform::mainTrack.getPowerMode()==POWERMODE::OFF) {
        DCCWaveform::mainTrack.setPowerMode(POWERMODE::ON); 
        CommandDistributor::broadcastPower();
     }
     DCC::setThrottle(loco,speed, forward^invert);
     speedo=speed;
}

bool RMFT2::readSensor(uint16_t sensorId) {
  // Exrail operands are unsigned but we need the signed version as inserted by the macros.  
  int16_t sId=(int16_t) sensorId;

  VPIN vpin=abs(sId);
  if (getFlag(vpin,LATCH_FLAG)) return true; // latched on

  // negative sensorIds invert the logic (e.g. for a break-beam sensor which goes OFF when detecting)
  bool s= IODevice::read(vpin) ^ (sId<0);
  if (s && diag) DIAG(F("EXRAIL Sensor %d hit"),sId);
  return s;
}

bool RMFT2::skipIfBlock() {
  // returns false if killed
  short nest = 1;
  while (nest > 0) {
    SKIPOP;
    byte opcode =  GET_OPCODE;
    switch(opcode) {
      case OPCODE_ENDEXRAIL: 
           kill(F("missing ENDIF"), nest);
           return false;  
      case OPCODE_IF:
      case OPCODE_IFGTE:
      case OPCODE_IFLT:
      case OPCODE_IFNOT:
      case OPCODE_IFRANDOM:
      case OPCODE_IFRESERVE:
           nest++;
           break;
      case OPCODE_ENDIF:
           nest--;
           break;
      default:
      break;
    }
  }
  return true; 
}



/* static */ void RMFT2::readLocoCallback(int16_t cv) {
     progtrackLocoId=cv;
}

void RMFT2::loop() {
  
  // Round Robin call to a RMFT task each time 
     if (loopTask==NULL) return; 
     loopTask=loopTask->next;
     if (pausingTask==NULL || pausingTask==loopTask) loopTask->loop2();
}    

  
void RMFT2::loop2() {
   if (delayTime!=0 && millis()-delayStart < delayTime) return;
     
  byte opcode = GET_OPCODE;
  int16_t operand =  GET_OPERAND(0);
  // if (diag) DIAG(F("RMFT2 %d %d"),opcode,operand); 
  // Attention: Returning from this switch leaves the program counter unchanged.
  //            This is used for unfinished waits for timers or sensors.
  //            Breaking from this switch will step to the next step in the route. 
  switch ((OPCODE)opcode) {
    
    case OPCODE_THROW:
         Turnout::setClosed(operand, false);
         break;
          
    case OPCODE_CLOSE:
         Turnout::setClosed(operand, true);
         break; 
    
    case OPCODE_REV:
      forward = false;
      driveLoco(operand);
      break;
    
    case OPCODE_FWD:
      forward = true;
      driveLoco(operand);
      break;
      
    case OPCODE_SPEED:
      driveLoco(operand);
      break;
    
    case OPCODE_INVERT_DIRECTION:
      invert= !invert;
      driveLoco(speedo);
      break;
      
    case OPCODE_RESERVE:
      if (getFlag(operand,SECTION_FLAG)) {
        driveLoco(0);
        delayMe(500);
        return;
      }
      setFlag(operand,SECTION_FLAG);
      break;
    
    case OPCODE_FREE:
      setFlag(operand,0,SECTION_FLAG);
      break;
    
    case OPCODE_AT:
      if (readSensor(operand)) break;
      delayMe(50);
      return;
    
    case OPCODE_AFTER: // waits for sensor to hit and then remain off for 0.5 seconds. (must come after an AT operation)
      if (readSensor(operand)) {
        // reset timer to half a second and keep waiting
        waitAfter=millis();
        delayMe(50);
        return; 
      }
      if (millis()-waitAfter < 500 ) return;   
      break;
    
    case OPCODE_LATCH:
      setFlag(operand,LATCH_FLAG);
      break;
    
    case OPCODE_UNLATCH:
      setFlag(operand,0,LATCH_FLAG);
      break;

    case OPCODE_SET:
      IODevice::write(operand,true);
      break;
  
    case OPCODE_RESET:
      IODevice::write(operand,false);
      break;
    
    case OPCODE_PAUSE:
         DCC::setThrottle(0,1,true);  // pause all locos on the track
         pausingTask=this;
         break;

    case OPCODE_POM:
        if (loco) DCC::writeCVByteMain(loco, operand, GET_OPERAND(1));
        break;

    case OPCODE_POWEROFF:
        DCCWaveform::mainTrack.setPowerMode(POWERMODE::OFF);
        DCCWaveform::progTrack.setPowerMode(POWERMODE::OFF);
        DCC::setProgTrackSyncMain(false);       
        CommandDistributor::broadcastPower();
        break;

    case OPCODE_RESUME:
         pausingTask=NULL;
         driveLoco(speedo);
         for (RMFT2 * t=next; t!=this;t=t->next) if (t->loco >0) t->driveLoco(t->speedo);
          break;        
    
    case OPCODE_IF: // do next operand if sensor set
      if (!readSensor(operand)) if (!skipIfBlock()) return;
      break;
    
    case OPCODE_IFGTE: // do next operand if sensor>= value
      if (IODevice::readAnalogue(operand)<(int)(GET_OPERAND(1))) if (!skipIfBlock()) return;
      break;

    case OPCODE_IFLT: // do next operand if sensor< value
      if (IODevice::readAnalogue(operand)>=(int)(GET_OPERAND(1))) if (!skipIfBlock()) return;
      break;
    
    case OPCODE_IFNOT: // do next operand if sensor not set
      if (readSensor(operand)) if (!skipIfBlock()) return;
      break;
   
    case OPCODE_IFRANDOM: // do block on random percentage
      if (random(100)>=operand) if (!skipIfBlock()) return;
      break;
   
    case OPCODE_IFRESERVE: // do block if we successfully RERSERVE
      if (!getFlag(operand,SECTION_FLAG)) setFlag(operand,SECTION_FLAG);
      else if (!skipIfBlock()) return;
      break;
      
    case OPCODE_ENDIF:
      break;
    
    case OPCODE_DELAY:
      delayMe(operand*100L);
      break;
   
    case OPCODE_DELAYMINS:
      delayMe(operand*60L*1000L);
      break;
    
    case OPCODE_RANDWAIT:
      delayMe(random(operand)*100L);
      break;
    
    case OPCODE_RED:
      doSignal(operand,true,false,false);
      break;
    
    case OPCODE_AMBER:
      doSignal(operand,false,true,false);
      break;
    
    case OPCODE_GREEN:
      doSignal(operand,false,false,true);
      break;
       
    case OPCODE_FON:      
      if (loco) DCC::setFn(loco,operand,true);
      break;
     
    case OPCODE_FOFF:
      if (loco) DCC::setFn(loco,operand,false);
      break;
    
    case OPCODE_DRIVE:
      {
        byte analogSpeed=IODevice::readAnalogue(operand) *127 / 1024;
        if (speedo!=analogSpeed) driveLoco(analogSpeed);
        break; 
      }    

    case OPCODE_XFON:      
      DCC::setFn(operand,GET_OPERAND(1),true);
      break;
   
    case OPCODE_XFOFF:      
      DCC::setFn(operand,GET_OPERAND(1),false);
      break;
   
    case OPCODE_DCCACTIVATE: {
      // operand is address<<3 | subaddr<<1 | active 
      int16_t addr=operand>>3;
      int16_t subaddr=(operand>>1) & 0x03;
      bool active=operand & 0x01;
      DCC::setAccessory(addr,subaddr,active);
      break;
    }

    case OPCODE_FOLLOW:
      progCounter=sequenceLookup->find(operand);
      if (progCounter<0) kill(F("FOLLOW unknown"), operand); 
      return;
  
    case OPCODE_CALL:
      if (stackDepth==MAX_STACK_DEPTH) {
        kill(F("CALL stack"), stackDepth);
        return;
      }
      callStack[stackDepth++]=progCounter+3;
      progCounter=sequenceLookup->find(operand);
      if (progCounter<0) kill(F("CALL unknown"),operand); 
      return;

    case OPCODE_RETURN:
      if (stackDepth==0) {
        kill(F("RETURN stack"));
        return;
      }
      progCounter=callStack[--stackDepth];
      return;
      
    case OPCODE_ENDTASK:
    case OPCODE_ENDEXRAIL:
      kill();
      return;
      
    case OPCODE_JOIN:
       DCCWaveform::mainTrack.setPowerMode(POWERMODE::ON); 
       DCCWaveform::progTrack.setPowerMode(POWERMODE::ON); 
       DCC::setProgTrackSyncMain(true);
       CommandDistributor::broadcastPower();
       break;

    case OPCODE_UNJOIN:
       DCC::setProgTrackSyncMain(false);
       CommandDistributor::broadcastPower();
       break;
       
    case OPCODE_READ_LOCO1: // READ_LOCO is implemented as 2 separate opcodes
       progtrackLocoId=LOCO_ID_WAITING;  // Nothing found yet
       DCC::getLocoId(readLocoCallback);
       break;
      
      case OPCODE_READ_LOCO2:
       if (progtrackLocoId==LOCO_ID_WAITING) {
        delayMe(100);
        return; // still waiting for callback
       }
       if (progtrackLocoId<0) {
        kill(F("No Loco Found"),progtrackLocoId);
        return; // still waiting for callback
       }
       
       loco=progtrackLocoId;
       speedo=0;
       forward=true;
       invert=false;
       break;
       
       case OPCODE_START:
           {
            int newPc=sequenceLookup->find(operand);
            if (newPc<0) break; 
            new RMFT2(newPc); 
           }
           break;
           
      case OPCODE_SENDLOCO:  // cab, route
           {
            int newPc=sequenceLookup->find(GET_OPERAND(1));
            if (newPc<0) break; 
            RMFT2* newtask=new RMFT2(newPc); // create new task 
            newtask->loco=operand; 
           }
           break;
           
       case OPCODE_SETLOCO:
           {
             loco=operand; 
             speedo=0;
             forward=true;
             invert=false;
            }
       break;

          
       case OPCODE_SERVO: // OPCODE_SERVO,V(vpin),OPCODE_PAD,V(position),OPCODE_PAD,V(profile),OPCODE_PAD,V(duration)
        IODevice::writeAnalogue(operand,GET_OPERAND(1),GET_OPERAND(2),GET_OPERAND(3));          
        break;
       
       case OPCODE_WAITFOR: // OPCODE_SERVO,V(pin)
            if (IODevice::isBusy(operand)) {
              delayMe(100);
              return;
            }
            break;

       case OPCODE_PRINT:
            printMessage(operand);
            break;
               
       case OPCODE_ROUTE:
       case OPCODE_AUTOMATION:
       case OPCODE_SEQUENCE:
          if (diag) DIAG(F("EXRAIL begin(%d)"),operand);
          break;

       case OPCODE_AUTOSTART: // Handled only during begin process
       case OPCODE_PAD: // Just a padding for previous opcode needing >1 operad byte.
       case OPCODE_SIGNAL: // Signal definition ignore at run time
       case OPCODE_TURNOUT: // Turnout definition ignored at runtime
       case OPCODE_SERVOTURNOUT: // Turnout definition ignored at runtime
       case OPCODE_PINTURNOUT: // Turnout definition ignored at runtime
       case OPCODE_ONCLOSE: // Turnout event catcers ignored here
       case OPCODE_ONTHROW: 
       case OPCODE_ONACTIVATE: // Activate event catcers ignored here
       case OPCODE_ONDEACTIVATE:  
       break;
    
    default:
      kill(F("INVOP"),operand);
    }
    // Falling out of the switch means move on to the next opcode
    SKIPOP;
}

void RMFT2::delayMe(long delay) {
     delayTime=delay;
     delayStart=millis();
}

void RMFT2::setFlag(VPIN id,byte onMask, byte offMask) {  
   if (FLAGOVERFLOW(id)) return; // Outside range limit
   byte f=flags[id];
   f &= ~offMask;
   f |= onMask;
   flags[id]=f;
}

bool RMFT2::getFlag(VPIN id,byte mask) {
   if (FLAGOVERFLOW(id)) return 0; // Outside range limit
   return flags[id]&mask;   
}

void RMFT2::kill(const FSH * reason, int operand) {
     if (reason) DIAG(F("EXRAIL ERROR pc=%d, cab=%d, %S %d"), progCounter,loco, reason, operand);
     else if (diag) DIAG(F("ENDTASK at pc=%d"), progCounter); 
     delete this;
}

/* static */ void RMFT2::doSignal(VPIN id,bool red, bool amber, bool green) { 
  // CAUTION: hides class member progCounter
  int progCounter=signalLookup->find(id);
  if (progCounter<0) return; 
  VPIN redpin=GET_OPERAND(0);
  if (redpin!=id) return; // something wrong in lookup
  VPIN amberpin=GET_OPERAND(1);
  VPIN greenpin=GET_OPERAND(2);
  // If amberpin is zero, synthesise amber from red+green
  IODevice::write(redpin,red || (amber && (amberpin==0)));
  if (amberpin) IODevice::write(amberpin,amber);
  if (greenpin) IODevice::write(greenpin,green || (amber && (amberpin==0)));
  }

 void RMFT2::turnoutEvent(int16_t turnoutId, bool closed) {
    // Hunt for an ONTHROW/ONCLOSE for this turnout 
    int pc= (closed?onCloseLookup:onThrowLookup)->find(turnoutId);
    if (pc<0) return;
    
    // Check we dont already have a task running this turnout
    RMFT2 * task=loopTask;                 
    while(task) {
      if (task->onTurnoutId==turnoutId) {
        DIAG(F("Recursive ONTHROW/ONCLOSE for Turnout %d"),turnoutId);
        return;
        }
      task=task->next;      
      if (task==loopTask) break;      
      }
    
     task->onTurnoutId=turnoutId; // flag for recursion detector
     task=new RMFT2(pc);  // new task starts at this instruction
 }

 void RMFT2::activateEvent(int16_t addr, bool activate) {
    // Hunt for an ONACTIVATE/ONDEACTIVATE for this accessory 
    int pc= (activate?onActivateLookup:onDeactivateLookup)->find(addr);
    if (pc<0) return;
    
    // Check we dont already have a task running this address
    RMFT2 * task=loopTask;                 
    while(task) {
      if (task->onActivateAddr==addr) {
        DIAG(F("Recursive ON(DE)ACTIVATE for  %d"),addr);
        return;
        }
      task=task->next;      
      if (task==loopTask) break;      
      }
    
     task->onActivateAddr=addr; // flag for recursion detector
     task=new RMFT2(pc);  // new task starts at this instruction
 }
 
 void RMFT2::printMessage2(const FSH * msg) {
        DIAG(F("EXRAIL(%d) %S"),loco,msg);
   }

// This is called by emitRouteDescriptions to emit a withrottle description for a route or autoomation. 
void RMFT2::emitRouteDescription(Print * stream, char type, int id, const FSH * description) {
 StringFormatter::send(stream,F("]\\[%c%d}|{%S}|{%c"),
              type,id,description, type=='R'?'2':'4');
}