/*
  xdrv_27_shutter.ino - Shutter/Blind support for Sonoff-Tasmota

  Copyright (C) 2019  Stefan Bode

  This program 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.

  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifdef USE_SHUTTER
/*********************************************************************************************\
 * Shutter or Blind support using two consecutive relays
\*********************************************************************************************/

#define XDRV_27            27

#define D_PRFX_SHUTTER "Shutter"
#define D_CMND_SHUTTER_OPEN "Open"
#define D_CMND_SHUTTER_CLOSE "Close"
#define D_CMND_SHUTTER_STOP "Stop"
#define D_CMND_SHUTTER_POSITION "Position"
#define D_CMND_SHUTTER_OPENTIME "OpenDuration"
#define D_CMND_SHUTTER_CLOSETIME "CloseDuration"
#define D_CMND_SHUTTER_RELAY "Relay"
#define D_CMND_SHUTTER_SETHALFWAY "SetHalfway"
#define D_CMND_SHUTTER_SETCLOSE "SetClose"
#define D_CMND_SHUTTER_INVERT "Invert"
#define D_CMND_SHUTTER_CLIBRATION "Calibration"

#define D_SHUTTER "SHUTTER"

const uint16_t MOTOR_STOP_TIME = 500;  // in mS

enum ShutterModes { SHT_OFF_OPEN__OFF_CLOSE, SHT_OFF_ON__OPEN_CLOSE, SHT_PULSE_OPEN__PULSE_CLOSE };

const char kShutterCommands[] PROGMEM = D_PRFX_SHUTTER "|"
  D_CMND_SHUTTER_OPEN "|" D_CMND_SHUTTER_CLOSE "|" D_CMND_SHUTTER_STOP "|" D_CMND_SHUTTER_POSITION  "|"
  D_CMND_SHUTTER_OPENTIME "|" D_CMND_SHUTTER_CLOSETIME "|" D_CMND_SHUTTER_RELAY "|"
  D_CMND_SHUTTER_SETHALFWAY "|" D_CMND_SHUTTER_SETCLOSE "|" D_CMND_SHUTTER_INVERT "|" D_CMND_SHUTTER_CLIBRATION;

void (* const ShutterCommand[])(void) PROGMEM = {
  &CmndShutterOpen, &CmndShutterClose, &CmndShutterStop, &CmndShutterPosition,
  &CmndShutterOpenTime, &CmndShutterCloseTime, &CmndShutterRelay,
  &CmndShutterSetHalfway, &CmndShutterSetClose, &CmndShutterInvert, &CmndShutterCalibration };

const char JSON_SHUTTER_POS[] PROGMEM = "\"" D_PRFX_SHUTTER "%d\":{\"Position\":%d,\"direction\":%d}";

#include <Ticker.h>

Ticker TickerShutter;

struct SHUTTER {
  power_t mask = 0;                       // bit mask with 11 at the position of relays that belong to at least ONE shutter
  power_t old_power = 0;                  // preserve old bitmask for power to extract the relay that changes.
  power_t switched_relay = 0;             // bitmatrix that contain the relays that was lastly changed.
  uint32_t time[MAX_SHUTTERS];
  int32_t open_max[MAX_SHUTTERS];         // max value on maximum open calculated
  int32_t target_position[MAX_SHUTTERS];  // position to go to
  int32_t start_position[MAX_SHUTTERS];
  int32_t real_position[MAX_SHUTTERS];    // value between 0 and Shutter.open_max
  uint16_t open_time[MAX_SHUTTERS];       // duration to open the shutter
  uint16_t close_time[MAX_SHUTTERS];      // duration to close the shutter
  uint16_t close_velocity[MAX_SHUTTERS];  // in relation to open velocity. higher value = faster
  uint16_t operations[MAX_SHUTTERS];
  int8_t  direction[MAX_SHUTTERS];        // 1 == UP , 0 == stop; -1 == down
  uint8_t mode = 0;                       // operation mode definition. see enum type above SHT_OFF_OPEN__OFF_CLOSE, SHT_OFF_ON__OPEN_CLOSE, SHT_PULSE_OPEN__PULSE_CLOSE
} Shutter;

void ShutterRtc50mS(void)
{
  for (uint32_t i = 0; i < MAX_SHUTTERS; i++) {
    Shutter.time[i]++;
  }
}

int32_t ShutterPercentToRealPosition(uint8_t percent,uint8_t index)
{
	if (Settings.shutter_set50percent[index] != 50) {
    return  percent <= 5 ?  Settings.shuttercoeff[2][index] * percent : Settings.shuttercoeff[1][index] * percent + Settings.shuttercoeff[0][index];
	} else {
		return  percent <= 5 ?  Settings.shuttercoeff[2][index] * percent : Settings.shuttercoeff[1][index] * percent + Settings.shuttercoeff[0][index];
	}
}

uint8_t ShutterRealToPercentPosition(int32_t realpos, uint8_t index)
{
	if (Settings.shutter_set50percent[index] != 50) {
		return Settings.shuttercoeff[2][index] * 5 > realpos ? realpos / Settings.shuttercoeff[2][index] : (realpos-Settings.shuttercoeff[0][index]) / Settings.shuttercoeff[1][index];
	} else {
		return Settings.shuttercoeff[2][index] * 5 > realpos ? realpos / Settings.shuttercoeff[2][index] : (realpos-Settings.shuttercoeff[0][index]) / Settings.shuttercoeff[1][index];
	}
}

void ShutterInit(void)
{
  shutters_present = 0;
  Shutter.mask = 0;
  //Initialize to get relay that changed
  Shutter.old_power = power;
  bool relay_in_interlock = false;

  AddLog_P2(LOG_LEVEL_INFO, PSTR("SHT: Accuracy digits: %d"), Settings.shutter_accuracy);

  for (uint32_t i = 0; i < MAX_SHUTTERS; i++) {
    // upgrade to 0.1sec calculation base.
    if ( Settings.shutter_accuracy == 0) {
      Settings.shutter_closetime[i] = Settings.shutter_closetime[i] * 10;
      Settings.shutter_opentime[i] = Settings.shutter_opentime[i] * 10;
    }
    // set startrelay to 1 on first init, but only to shutter 1. 90% usecase
    Settings.shutter_startrelay[i] = (Settings.shutter_startrelay[i] == 0 && i ==  0? 1 : Settings.shutter_startrelay[i]);
    if (Settings.shutter_startrelay[i] && Settings.shutter_startrelay[i] <9) {
      shutters_present++;

      // Determine shutter types
      Shutter.mask |= 3 << (Settings.shutter_startrelay[i] -1)  ;

      for (uint32_t j = 0; j < MAX_INTERLOCKS * Settings.flag.interlock; j++) {
        //AddLog_P2(LOG_LEVEL_INFO, PSTR("SHT: Interlock state i=%d %d, flag %d, , shuttermask %d, maskedIL %d"),i, Settings.interlock[i], Settings.flag.interlock,Shutter.mask, Settings.interlock[i]&Shutter.mask);
        if (Settings.interlock[j] && Settings.interlock[j] & Shutter.mask) {
          //AddLog_P2(LOG_LEVEL_INFO, PSTR("SHT: Relay in Interlock group"));
          relay_in_interlock = true;
        }
      }
      if (relay_in_interlock) {
        if (Settings.pulse_timer[i] > 0) {
          Shutter.mode = SHT_PULSE_OPEN__PULSE_CLOSE;
        } else {
          Shutter.mode = SHT_OFF_OPEN__OFF_CLOSE;
        }
      } else {
        Shutter.mode = SHT_OFF_ON__OPEN_CLOSE;
      }

      TickerShutter.attach_ms(50, ShutterRtc50mS );
      // default the 50 percent should not have any impact without changing it. set to 60
      Settings.shutter_set50percent[i] = (Settings.shutter_set50percent[i] == 0 ? 50 : Settings.shutter_set50percent[i]);
      // use 10 sec. as default to allow everybody to play without deep initialize
      Shutter.open_time[i] = Settings.shutter_opentime[i] > 0 ? Settings.shutter_opentime[i] : 100;
      Shutter.close_time[i] = Settings.shutter_closetime[i] > 0 ? Settings.shutter_closetime[i] : 100;

      // Update Calculation 20 because time interval is 0.05 sec
      Shutter.open_max[i] = 200 * Shutter.open_time[i];
      Shutter.close_velocity[i] =  Shutter.open_max[i] /  Shutter.close_time[i] / 2 ;

      // calculate a ramp slope at the first 5 percent to compensate that shutters move with down part later than the upper part
      Settings.shuttercoeff[1][i] = Shutter.open_max[i] * (100 - Settings.shutter_set50percent[i] ) / 5000;
      Settings.shuttercoeff[0][i] = Shutter.open_max[i] - (Settings.shuttercoeff[1][i] * 100);
      Settings.shuttercoeff[2][i] = (Settings.shuttercoeff[0][i] + 5 * Settings.shuttercoeff[1][i]) / 5;
      Shutter.mask |= 3 << (Settings.shutter_startrelay[i] -1)  ;

      Shutter.real_position[i] = ShutterPercentToRealPosition(Settings.shutter_position[i], i);
      //Shutter.real_position[i] =   Settings.shutter_position[i] <= 5 ?  Settings.shuttercoeff[2][i] * Settings.shutter_position[i] : Settings.shuttercoeff[1][i] * Settings.shutter_position[i] + Settings.shuttercoeff[0,i];
      Shutter.start_position[i] = Shutter.real_position[i];

      char shutter_open_chr[10];
      dtostrfd((float)Shutter.open_time[i] / 10 , 1, shutter_open_chr);
      char shutter_close_chr[10];
      dtostrfd((float)Shutter.close_time[i] / 10, 1, shutter_close_chr);
      AddLog_P2(LOG_LEVEL_INFO, PSTR("SHT: Shutter %d (Relay:%d): Init. Pos: %d [%d %%], Open Vel.: 100 Close Vel.: %d , Max Way: %d, Opentime %s [s], Closetime %s [s], CoedffCalc: c0: %d, c1 %d, c2: %d, c3: %d, c4: %d, binmask %d, is inverted %d, shuttermode %d"),
        i, Settings.shutter_startrelay[i], Shutter.real_position[i], Settings.shutter_position[i], Shutter.close_velocity[i], Shutter.open_max[i], shutter_open_chr, shutter_close_chr,
        Settings.shuttercoeff[0][i], Settings.shuttercoeff[1][i], Settings.shuttercoeff[2][i], Settings.shuttercoeff[3][i], Settings.shuttercoeff[4][i],
        Shutter.mask, Settings.shutter_invert[i], Shutter.mode);

    } else {
      // terminate loop at first INVALID shutter.
      break;
    }
    Settings.shutter_accuracy = 1;
  }
}

void ShutterUpdatePosition(void)
{
  char scommand[CMDSZ];
  char stopic[TOPSZ];

  for (uint32_t i = 0; i < shutters_present; i++) {
    if (Shutter.direction[i] != 0) {
      //char stemp1[20];
      Shutter.real_position[i] = Shutter.start_position[i] + ( Shutter.time[i] * (Shutter.direction[i] > 0 ? 100 : -Shutter.close_velocity[i]));
      // avoid real position leaving the boundaries.
      Shutter.real_position[i] = Shutter.real_position[i] < 0 ? 0 : (Shutter.real_position[i] > Shutter.open_max[i] ? Shutter.open_max[i] : Shutter.real_position[i]) ;

      // Add additional runtime, if shutter did not reach the endstop for some time.
      if (Shutter.target_position[i] == Shutter.real_position[i] && Shutter.target_position[i] == 0) {
        // for every operation add 5x50ms = 250ms to stop position
        //AddLog_P2(LOG_LEVEL_DEBUG, PSTR("SHT: Adding additional runtime"));
        Shutter.real_position[i] += 500 * Shutter.operations[i] ;
        Shutter.operations[i]  = 0;
      }
      if (Shutter.real_position[i] * Shutter.direction[i] >= Shutter.target_position[i] * Shutter.direction[i] ) {
        // calculate relay number responsible for current movement.
        //AddLog_P2(LOG_LEVEL_DEBUG, PSTR("SHT: Stop Condition detected: real: %d, Target: %d, direction: %d"),Shutter.real_position[i], Shutter.target_position[i],Shutter.direction[i]);
        uint8_t cur_relay = Settings.shutter_startrelay[i] + (Shutter.direction[i] == 1 ? 0 : 1) ;
        char stemp2[10];

        Settings.shutter_position[i] = ShutterRealToPercentPosition(Shutter.real_position[i], i);
        //Settings.shutter_position[i] = Settings.shuttercoeff[2][i] * 5 > Shutter.real_position[i] ? (Shutter.real_position[i] * 10 / Settings.shuttercoeff[2][i] + 4)/10 : ((Shutter.real_position[i]-Settings.shuttercoeff[0,i]) *10 / Settings.shuttercoeff[1][i] +4) / 10;

        if (0 < Settings.shutter_position[i] && Settings.shutter_position[i] < 100) {
          Shutter.operations[i]++;
        } else {
          Shutter.operations[i]  = 0;
        }

        dtostrfd((float)Shutter.time[i] / 20, 1, stemp2);
        AddLog_P2(LOG_LEVEL_DEBUG, PSTR("SHT: Shutter %d: Real Pos. %d, Stoppos: %ld, relay: %d, direction %d, pulsetimer: %d, rtcshutter: %s [s], operationtime %d"), i, Shutter.real_position[i], Settings.shutter_position[i], cur_relay -1, Shutter.direction[i], Settings.pulse_timer[cur_relay -1], stemp2, Shutter.operations[i]);
        Shutter.start_position[i] = Shutter.real_position[i];

        // sending MQTT result to broker
        snprintf_P(scommand, sizeof(scommand),PSTR(D_SHUTTER "%d"), i+1);
        GetTopic_P(stopic, STAT, mqtt_topic, scommand);
        Response_P("%d", Settings.shutter_invert[i] ? 100 - Settings.shutter_position[i]: Settings.shutter_position[i]);
        MqttPublish(stopic, Settings.flag.mqtt_power_retain);

        switch (Shutter.mode) {
          case SHT_PULSE_OPEN__PULSE_CLOSE:
            // we have a momentary switch here. Needs additional pulse on same relay after the end
            if (SRC_PULSETIMER == last_source || SRC_SHUTTER == last_source || SRC_WEBGUI == last_source) {
              ExecuteCommandPower(cur_relay, 1, SRC_SHUTTER);
            } else {
              last_source = SRC_SHUTTER;
            }
          break;
          case SHT_OFF_ON__OPEN_CLOSE:
            // This is a failsafe configuration. Relay1 ON/OFF Relay2 -1/1 direction
            if ((1 << (Settings.shutter_startrelay[i]-1)) & power) {
              ExecuteCommandPower(Settings.shutter_startrelay[i], 0, SRC_SHUTTER);
            }
          break;
          case SHT_OFF_OPEN__OFF_CLOSE:
            // avoid switching OFF a relay already OFF
            if ((1 << (cur_relay-1)) & power) {
              // Relay is on and need to be switched off.
              ExecuteCommandPower(cur_relay, 0, SRC_SHUTTER);
            }
          break;
        }
        Shutter.direction[i] = 0;
        uint8_t position =  Settings.shutter_invert[i] ? 100 - Settings.shutter_position[i]: Settings.shutter_position[i];
        Response_P(PSTR("{"));
        ResponseAppend_P(JSON_SHUTTER_POS, i+1, position, 0 /*Shutter.direction[i]*/);
        ResponseJsonEnd();
        MqttPublishPrefixTopic_P(RESULT_OR_TELE, mqtt_data);
        XdrvRulesProcess();
      }
    }
  }
}

bool ShutterState(uint8_t device)
{
  device--;
  device &= 3;
  return (Settings.flag3.shutter_mode && (Shutter.mask & (1 << (Settings.shutter_startrelay[device]-1))) );
}

void ShutterStartInit(uint8_t index, uint8_t direction, int32_t target_pos)
{
  Shutter.direction[index] = direction;
  Shutter.target_position[index] = target_pos;
  Shutter.start_position[index] = Shutter.real_position[index];
  Shutter.time[index] = 0;
  //AddLog_P2(LOG_LEVEL_INFO,  PSTR("SHT: Start shutter: %d from %d to %d in directin %d"), index, Shutter.start_position[index], Shutter.target_position[index], Shutter.direction[index]);
}

void ShutterDelayForMotorStop(void)
{
  AddLog_P2(LOG_LEVEL_INFO, PSTR("SHT: Wait for Motorstop %d"), MOTOR_STOP_TIME);
  delay(MOTOR_STOP_TIME);
}

void ShutterReportPosition(void)
{
  uint16_t shutter_moving = 0;
  for (uint32_t i = 0; i < shutters_present; i++) {
    if (Shutter.direction[i] != 0) {
      char stemp1[20];
      char stemp2[10];
      dtostrfd((float)Shutter.time[i] / 20, 1, stemp2);
      shutter_moving = 1;
      //Settings.shutter_position[i] = Settings.shuttercoeff[2][i] * 5 > Shutter.real_position[i] ? Shutter.real_position[i] / Settings.shuttercoeff[2][i] : (Shutter.real_position[i]-Settings.shuttercoeff[0,i]) / Settings.shuttercoeff[1][i];
      AddLog_P2(LOG_LEVEL_INFO, PSTR("SHT: Shutter %d: Real Pos: %d, Target %d, source: %s, start-pos: %d %%, direction: %d, rtcshutter: %s  [s]"), i,Shutter.real_position[i], Shutter.target_position[i], GetTextIndexed(stemp1, sizeof(stemp1), last_source, kCommandSource), Settings.shutter_position[i], Shutter.direction[i], stemp2 );
    }
  }
  if (rules_flag.shutter_moving > shutter_moving) {
    rules_flag.shutter_moved = 1;
  } else {
    rules_flag.shutter_moved = 0;
  }
  rules_flag.shutter_moving = shutter_moving;
  //AddLog_P2(LOG_LEVEL_DEBUG_MORE, PSTR("SHT: rules_flag.shutter_moving: %d, moved %d"), rules_flag.shutter_moving, rules_flag.shutter_moved);
}

void ShutterRelayChanged(void)
{

  // Shutter.switched_relay = binary relay that was recently changed and cause an Action
  // powerstate_local = binary powermatrix and relays from shutter: 0..3
  // relays_changed = bool if one of the relays that belong to the shutter changed not by shutter or pulsetimer
  char stemp1[10];

	for (uint32_t i = 0; i < shutters_present; i++) {
		power_t powerstate_local = (power >> (Settings.shutter_startrelay[i] -1)) & 3;
		//uint8   manual_relays_changed = ((Shutter.switched_relay >> (Settings.shutter_startrelay[i] -1)) & 3) && SRC_IGNORE != last_source && SRC_SHUTTER != last_source && SRC_PULSETIMER != last_source ;
    uint8   manual_relays_changed = ((Shutter.switched_relay >> (Settings.shutter_startrelay[i] -1)) & 3) && SRC_SHUTTER != last_source && SRC_PULSETIMER != last_source ;
    if (manual_relays_changed) {
      if (Shutter.mode == SHT_OFF_ON__OPEN_CLOSE) {
				switch (powerstate_local) {
					case 1:
            ShutterDelayForMotorStop();
					  ShutterStartInit(i, 1, Shutter.open_max[i]);
					  break;
					case 3:
            ShutterDelayForMotorStop();
					  ShutterStartInit(i, -1, 0);
					  break;
					default:
					  Shutter.direction[i] = 0;
					  Shutter.target_position[i] = Shutter.real_position[i];
				  }
			} else {
        if (Shutter.direction[i] != 0 && (!powerstate_local || (powerstate_local && Shutter.mode == SHT_PULSE_OPEN__PULSE_CLOSE))) {
					Shutter.target_position[i] = Shutter.real_position[i];
					AddLog_P2(LOG_LEVEL_DEBUG, PSTR("SHT: Shutter %d: Switch OFF motor. Target: %ld, source: %s, powerstate_local %ld, Shutter.switched_relay %d, manual change %d"), i, Shutter.target_position[i], GetTextIndexed(stemp1, sizeof(stemp1), last_source, kCommandSource), powerstate_local,Shutter.switched_relay,manual_relays_changed);
				} else {
					last_source = SRC_SHUTTER; // avoid switch off in the next loop
					if (powerstate_local == 2) { // testing on CLOSE relay, if ON
					  // close with relay two
            ShutterDelayForMotorStop();
					  ShutterStartInit(i, -1, 0);
					} else {
					  // opens with relay one
            ShutterDelayForMotorStop();
					  ShutterStartInit(i, 1, Shutter.open_max[i]);
					}
				}
        AddLog_P2(LOG_LEVEL_DEBUG, PSTR("SHT: Shutter %d: Target: %ld, powerstatelocal %d"), i, Shutter.target_position[i], powerstate_local);
			}
		}
	}
}

///////////////////////////////////////////////////////////////////////////////////
// Shutter specific functions
// TODO: move to shutter driver and make them accessible in a generic way

// device: 1..<numberOfShutters>
// position: 0-100
void ShutterSetPosition(uint8_t device, uint8_t position)
{
  char svalue[32];                   // Command and number parameter
  snprintf_P(svalue, sizeof(svalue), PSTR(D_PRFX_SHUTTER D_CMND_SHUTTER_POSITION "%d %d"), device, position);
  ExecuteCommand(svalue, SRC_IGNORE);
}

/*********************************************************************************************\
 * Commands
\*********************************************************************************************/

void CmndShutterOpen(void)
{
  XdrvMailbox.payload = 100;
  last_source = SRC_WEBGUI;
  CmndShutterPosition();
}

void CmndShutterClose(void)
{
  XdrvMailbox.payload = 0;
  last_source = SRC_WEBGUI;
  CmndShutterPosition();
}

void CmndShutterStop(void)
{
  if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= shutters_present)) {
    uint32_t index = XdrvMailbox.index -1;
    if (Shutter.direction[index] != 0) {

      //AddLog_P2(LOG_LEVEL_INFO, PSTR("SHT: Stop moving shutter %d: direction: %d"), XdrvMailbox.index, Shutter.direction[index]);

      int32_t temp_realpos = Shutter.start_position[index] + ( (Shutter.time[index]+10) * (Shutter.direction[index] > 0 ? 100 : -Shutter.close_velocity[index]));
      XdrvMailbox.payload = ShutterRealToPercentPosition(temp_realpos, index);
      //XdrvMailbox.payload = Settings.shuttercoeff[2][index] * 5 > temp_realpos ? temp_realpos / Settings.shuttercoeff[2][index] : (temp_realpos-Settings.shuttercoeff[0,index]) / Settings.shuttercoeff[1][index];
      last_source = SRC_WEBGUI;
      CmndShutterPosition();
    } else {
      ResponseCmndDone();
    }
  }
}

void CmndShutterPosition(void)
{
  if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= shutters_present)) {
    uint32_t index = XdrvMailbox.index -1;
    //limit the payload
    AddLog_P2(LOG_LEVEL_DEBUG, PSTR("SHT: Position in: payload %d, index %d, source %d"), XdrvMailbox.payload , XdrvMailbox.index, last_source );

    int8_t target_pos_percent = XdrvMailbox.payload < 0 ? 0 : (XdrvMailbox.payload > 100 ? 100 : XdrvMailbox.payload);
    // webgui still send also on inverted shutter the native position.
    target_pos_percent = Settings.shutter_invert[index] &&  SRC_WEBGUI != last_source ? 100 - target_pos_percent : target_pos_percent;
    if (target_pos_percent != -99) {
      //target_pos_percent = Settings.shutter_invert[index] ? 100 - target_pos_percent : target_pos_percent;
      Shutter.target_position[index] = ShutterPercentToRealPosition(target_pos_percent, index);
      //Shutter.target_position[index] = XdrvMailbox.payload < 5 ?  Settings.shuttercoeff[2][index] * XdrvMailbox.payload : Settings.shuttercoeff[1][index] * XdrvMailbox.payload + Settings.shuttercoeff[0,index];
      AddLog_P2(LOG_LEVEL_DEBUG, PSTR("SHT: lastsource %d:, realpos %d, target %d, payload %d"), last_source, Shutter.real_position[index] ,Shutter.target_position[index],target_pos_percent);
    }
    if ( (target_pos_percent >= 0) && (target_pos_percent <= 100) && abs(Shutter.target_position[index] - Shutter.real_position[index] ) / Shutter.close_velocity[index] > 2) {
      int8_t new_shutterdirection = Shutter.real_position[index] < Shutter.target_position[index] ? 1 : -1;
      if (Shutter.direction[index] ==  -new_shutterdirection ) {
        // direction need to be changed. on momentary switches first stop the Shutter
        if (Shutter.mode == SHT_PULSE_OPEN__PULSE_CLOSE) {
          // code for momentary shutters only small switch on to stop Shutter
          ExecuteCommandPower(Settings.shutter_startrelay[index] + (new_shutterdirection == 1 ? 0 : 1), 1, SRC_SHUTTER);
          delay(100);
        } else {
          ExecuteCommandPower(Settings.shutter_startrelay[index] + (new_shutterdirection == 1 ? 1 : 0), 0, SRC_SHUTTER);
          ShutterDelayForMotorStop();
        }
      }
      if (Shutter.direction[index] !=  new_shutterdirection ) {
        ShutterStartInit(index, new_shutterdirection, Shutter.target_position[index]);
        Shutter.operations[index]++;
        if (Shutter.mode == SHT_OFF_ON__OPEN_CLOSE) {
          ExecuteCommandPower(Settings.shutter_startrelay[index] , 0, SRC_SHUTTER);
          //AddLog_P2(LOG_LEVEL_DEBUG, PSTR("SHT: Delay5 5s, xdrv %d"), XdrvMailbox.payload);
          ShutterDelayForMotorStop();
          // Code for shutters with circuit safe configuration, switch the direction Relay
          ExecuteCommandPower(Settings.shutter_startrelay[index] +1, new_shutterdirection == 1 ? 0 : 1, SRC_SHUTTER);
          // power on
          ExecuteCommandPower(Settings.shutter_startrelay[index] , 1, SRC_SHUTTER);
        } else {
          // now start the motor for the right direction, work for momentary and normal shutters.
          AddLog_P2(LOG_LEVEL_INFO, PSTR("SHT: Start shutter in direction %d"), Shutter.direction[index]);
          ExecuteCommandPower(Settings.shutter_startrelay[index] + (new_shutterdirection == 1 ? 0 : 1), 1, SRC_SHUTTER);
          //AddLog_P2(LOG_LEVEL_DEBUG, PSTR("SHT: Delay6 5s, xdrv %d"), XdrvMailbox.payload);
        }
        Shutter.switched_relay = 0;
      }
    } else {
      target_pos_percent = ShutterRealToPercentPosition(Shutter.real_position[index], index);
    }
    ResponseCmndIdxNumber(Settings.shutter_invert[index]  ? 100 - target_pos_percent : target_pos_percent);
  }
}

void CmndShutterOpenTime(void)
{
  if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= shutters_present)) {
    if (XdrvMailbox.data_len > 0) {
      Settings.shutter_opentime[XdrvMailbox.index-1] = (uint16_t)(10 * CharToFloat(XdrvMailbox.data));
      ShutterInit();
    }
    char time_chr[10];
    dtostrfd((float)(Settings.shutter_opentime[XdrvMailbox.index-1]) / 10, 1, time_chr);
    ResponseCmndIdxChar(time_chr);
  }
}

void CmndShutterCloseTime(void)
{
  if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= shutters_present)) {
    if (XdrvMailbox.data_len > 0) {
      Settings.shutter_closetime[XdrvMailbox.index-1] = (uint16_t)(10 * CharToFloat(XdrvMailbox.data));
      ShutterInit();
    }
    char time_chr[10];
    dtostrfd((float)(Settings.shutter_closetime[XdrvMailbox.index-1]) / 10, 1, time_chr);
    ResponseCmndIdxChar(time_chr);
  }
}

void CmndShutterRelay(void)
{
  if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= MAX_SHUTTERS)) {
    if ((XdrvMailbox.payload >= 0) && (XdrvMailbox.payload <= 64)) {
      Settings.shutter_startrelay[XdrvMailbox.index-1] = XdrvMailbox.payload;
      if (XdrvMailbox.payload > 0) {
        Shutter.mask |= 3 << (XdrvMailbox.payload - 1);
      } else {
        Shutter.mask ^= 3 << (Settings.shutter_startrelay[XdrvMailbox.index-1] - 1);
      }
      AddLog_P2(LOG_LEVEL_INFO, PSTR("SHT: Relay %d is %d"), XdrvMailbox.index,  XdrvMailbox.payload);
      Settings.shutter_startrelay[XdrvMailbox.index-1] = XdrvMailbox.payload;
      ShutterInit();
      // if payload is 0 to disable the relay there must be a reboot. Otherwhise does not work
    }
    ResponseCmndIdxNumber(Settings.shutter_startrelay[XdrvMailbox.index -1]);
  }
}

void CmndShutterSetHalfway(void)
{
  if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= shutters_present)) {
    if ((XdrvMailbox.payload >= 0) && (XdrvMailbox.payload <= 100)) {
      Settings.shutter_set50percent[XdrvMailbox.index-1] = Settings.shutter_invert[XdrvMailbox.index-1] ? 100 - XdrvMailbox.payload : XdrvMailbox.payload;
      ShutterInit();
      ResponseCmndIdxNumber(XdrvMailbox.payload);  // ????
    } else {
      ResponseCmndIdxNumber(Settings.shutter_set50percent[XdrvMailbox.index-1]);
    }
  }
}

void CmndShutterSetClose(void)
{
  if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= shutters_present)) {
    Shutter.real_position[XdrvMailbox.index-1] = 0;
    ShutterStartInit(XdrvMailbox.index-1, 0, 0);
    Settings.shutter_position[XdrvMailbox.index-1] = 0;
    ResponseCmndChar(D_CONFIGURATION_RESET);
  }
}

void CmndShutterInvert(void)
{
  if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= shutters_present)) {
    if ((XdrvMailbox.payload >= 0) && (XdrvMailbox.payload <= 1)) {
      Settings.shutter_invert[XdrvMailbox.index-1] = XdrvMailbox.payload;
    }
    ResponseCmndIdxNumber(Settings.shutter_invert[XdrvMailbox.index-1]);
  }
}

void CmndShutterCalibration(void)  // ????
{
  if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= MAX_SHUTTERS)) {
    if (XdrvMailbox.data_len > 0) {
      ResponseCmndIdxChar(XdrvMailbox.data);
    }
  }
}

/*********************************************************************************************\
 * Interface
\*********************************************************************************************/

bool Xdrv27(uint8_t function)
{
  bool result = false;

  if (Settings.flag3.shutter_mode) {
    switch (function) {
      case FUNC_PRE_INIT:
        ShutterInit();
        break;
      case FUNC_EVERY_50_MSECOND:
        ShutterUpdatePosition();
        break;
      case FUNC_EVERY_SECOND:
        ShutterReportPosition();
        break;
      case FUNC_COMMAND:
        result = DecodeCommand(kShutterCommands, ShutterCommand);
        break;
      case FUNC_JSON_APPEND:
        for (uint32_t i = 0; i < shutters_present; i++) {
          uint8_t position =  Settings.shutter_invert[i] ? 100 - Settings.shutter_position[i]: Settings.shutter_position[i];
          ResponseAppend_P(",");
          ResponseAppend_P(JSON_SHUTTER_POS, i+1, position, Shutter.direction[i]);
#ifdef USE_DOMOTICZ
          if ((0 == tele_period) && (0 == i)) {
             DomoticzSensor(DZ_SHUTTER, position);
          }
#endif  // USE_DOMOTICZ
        }
        break;
      case FUNC_SET_POWER:
        char stemp1[10];
        // extract the number of the relay that was switched and save for later in Update Position.
        Shutter.switched_relay = power ^ Shutter.old_power;
        Shutter.old_power = power;
        AddLog_P2(LOG_LEVEL_DEBUG_MORE, PSTR("SHT: Switched relay: %d by %s"), Shutter.switched_relay,GetTextIndexed(stemp1, sizeof(stemp1), last_source, kCommandSource));
        ShutterRelayChanged();
      break;
    }
  }
  return result;
}

#endif //USE_SHUTTER