/*
  xsns_01_counter.ino - Counter sensors (water meters, electricity meters etc.) sensor support for Tasmota

  Copyright (C) 2020  Maarten Damen and Theo Arends

  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_COUNTER
/*********************************************************************************************\
 * Counter sensors (water meters, electricity meters etc.)
\*********************************************************************************************/

#define XSNS_01             1

#define D_PRFX_COUNTER "Counter"
#define D_CMND_COUNTERTYPE "Type"
#define D_CMND_COUNTERDEBOUNCE "Debounce"

const char kCounterCommands[] PROGMEM = D_PRFX_COUNTER "|"  // Prefix
  "|" D_CMND_COUNTERTYPE "|" D_CMND_COUNTERDEBOUNCE ;

void (* const CounterCommand[])(void) PROGMEM = {
  &CmndCounter, &CmndCounterType, &CmndCounterDebounce };

struct COUNTER {
  uint32_t timer[MAX_COUNTERS];  // Last counter time in micro seconds
  uint8_t no_pullup = 0;         // Counter input pullup flag (1 = No pullup)
  bool any_counter = false;
} Counter;

#ifndef ARDUINO_ESP8266_RELEASE_2_3_0  // Fix core 2.5.x ISR not in IRAM Exception
void CounterUpdate(uint8_t index) ICACHE_RAM_ATTR;
void CounterUpdate1(void) ICACHE_RAM_ATTR;
void CounterUpdate2(void) ICACHE_RAM_ATTR;
void CounterUpdate3(void) ICACHE_RAM_ATTR;
void CounterUpdate4(void) ICACHE_RAM_ATTR;
#endif  // ARDUINO_ESP8266_RELEASE_2_3_0

void CounterUpdate(uint8_t index)
{
  uint32_t time = micros();
  uint32_t debounce_time = time - Counter.timer[index];
  if (debounce_time > Settings.pulse_counter_debounce * 1000) {
    Counter.timer[index] = time;
    if (bitRead(Settings.pulse_counter_type, index)) {
      RtcSettings.pulse_counter[index] = debounce_time;
    } else {
      RtcSettings.pulse_counter[index]++;
    }
  }
}

void CounterUpdate1(void)
{
  CounterUpdate(0);
}

void CounterUpdate2(void)
{
  CounterUpdate(1);
}

void CounterUpdate3(void)
{
  CounterUpdate(2);
}

void CounterUpdate4(void)
{
  CounterUpdate(3);
}

/********************************************************************************************/

bool CounterPinState(void)
{
  if ((XdrvMailbox.index >= GPIO_CNTR1_NP) && (XdrvMailbox.index < (GPIO_CNTR1_NP + MAX_COUNTERS))) {
    bitSet(Counter.no_pullup, XdrvMailbox.index - GPIO_CNTR1_NP);
    XdrvMailbox.index -= (GPIO_CNTR1_NP - GPIO_CNTR1);
    return true;
  }
  return false;
}

void CounterInit(void)
{
  typedef void (*function) () ;
  function counter_callbacks[] = { CounterUpdate1, CounterUpdate2, CounterUpdate3, CounterUpdate4 };

  for (uint32_t i = 0; i < MAX_COUNTERS; i++) {
    if (pin[GPIO_CNTR1 +i] < 99) {
      Counter.any_counter = true;
      pinMode(pin[GPIO_CNTR1 +i], bitRead(Counter.no_pullup, i) ? INPUT : INPUT_PULLUP);
      attachInterrupt(pin[GPIO_CNTR1 +i], counter_callbacks[i], FALLING);
    }
  }
}

void CounterEverySecond(void)
{
  for (uint32_t i = 0; i < MAX_COUNTERS; i++) {
    if (pin[GPIO_CNTR1 +i] < 99) {
      if (bitRead(Settings.pulse_counter_type, i)) {
        uint32_t time = micros() - Counter.timer[i];
        if (time > 4200000000) {  // 70 minutes
          RtcSettings.pulse_counter[i] = 4200000000;  // Set Timer to max in case of no more interrupts due to stall of measured device
        }
      }
    }
  }
}

void CounterSaveState(void)
{
  for (uint32_t i = 0; i < MAX_COUNTERS; i++) {
    if (pin[GPIO_CNTR1 +i] < 99) {
      Settings.pulse_counter[i] = RtcSettings.pulse_counter[i];
    }
  }
}

void CounterShow(bool json)
{
  bool header = false;
  uint8_t dsxflg = 0;
  for (uint32_t i = 0; i < MAX_COUNTERS; i++) {
    if (pin[GPIO_CNTR1 +i] < 99) {
      char counter[33];
      if (bitRead(Settings.pulse_counter_type, i)) {
        dtostrfd((double)RtcSettings.pulse_counter[i] / 1000000, 6, counter);
      } else {
        dsxflg++;
        snprintf_P(counter, sizeof(counter), PSTR("%lu"), RtcSettings.pulse_counter[i]);
      }

      if (json) {
        if (!header) {
          ResponseAppend_P(PSTR(",\"COUNTER\":{"));
        }
        ResponseAppend_P(PSTR("%s\"C%d\":%s"), (header)?",":"", i +1, counter);
        header = true;
#ifdef USE_DOMOTICZ
        if ((0 == tele_period) && (1 == dsxflg)) {
          DomoticzSensor(DZ_COUNT, RtcSettings.pulse_counter[i]);
          dsxflg++;
        }
#endif  // USE_DOMOTICZ
        if ((0 == tele_period ) && (Settings.flag3.counter_reset_on_tele)) {
          RtcSettings.pulse_counter[i] = 0;
        }
#ifdef USE_WEBSERVER
      } else {
        WSContentSend_PD(PSTR("{s}" D_COUNTER "%d{m}%s%s{e}"),
          i +1, counter, (bitRead(Settings.pulse_counter_type, i)) ? " " D_UNIT_SECOND : "");
#endif  // USE_WEBSERVER
      }
    }
  }
  if (header) {
    ResponseJsonEnd();
  }
}

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

void CmndCounter(void)
{
  if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= MAX_COUNTERS)) {
    if ((XdrvMailbox.data_len > 0) && (pin[GPIO_CNTR1 + XdrvMailbox.index -1] < 99)) {
      if ((XdrvMailbox.data[0] == '-') || (XdrvMailbox.data[0] == '+')) {
        RtcSettings.pulse_counter[XdrvMailbox.index -1] += XdrvMailbox.payload;
        Settings.pulse_counter[XdrvMailbox.index -1] += XdrvMailbox.payload;
      } else {
        RtcSettings.pulse_counter[XdrvMailbox.index -1] = XdrvMailbox.payload;
        Settings.pulse_counter[XdrvMailbox.index -1] = XdrvMailbox.payload;
      }
    }
    ResponseCmndIdxNumber(RtcSettings.pulse_counter[XdrvMailbox.index -1]);
  }
}

void CmndCounterType(void)
{
  if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= MAX_COUNTERS)) {
    if ((XdrvMailbox.payload >= 0) && (XdrvMailbox.payload <= 1) && (pin[GPIO_CNTR1 + XdrvMailbox.index -1] < 99)) {
      bitWrite(Settings.pulse_counter_type, XdrvMailbox.index -1, XdrvMailbox.payload &1);
      RtcSettings.pulse_counter[XdrvMailbox.index -1] = 0;
      Settings.pulse_counter[XdrvMailbox.index -1] = 0;
    }
    ResponseCmndIdxNumber(bitRead(Settings.pulse_counter_type, XdrvMailbox.index -1));
  }
}

void CmndCounterDebounce(void)
{
  if ((XdrvMailbox.payload >= 0) && (XdrvMailbox.payload < 32001)) {
    Settings.pulse_counter_debounce = XdrvMailbox.payload;
  }
  ResponseCmndNumber(Settings.pulse_counter_debounce);
}

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

bool Xsns01(uint8_t function)
{
  bool result = false;

  if (Counter.any_counter) {
    switch (function) {
      case FUNC_EVERY_SECOND:
        CounterEverySecond();
        break;
      case FUNC_JSON_APPEND:
        CounterShow(1);
        break;
#ifdef USE_WEBSERVER
      case FUNC_WEB_SENSOR:
        CounterShow(0);
        break;
#endif  // USE_WEBSERVER
      case FUNC_SAVE_BEFORE_RESTART:
      case FUNC_SAVE_AT_MIDNIGHT:
        CounterSaveState();
        break;
      case FUNC_COMMAND:
        result = DecodeCommand(kCounterCommands, CounterCommand);
        break;
    }
  } else {
    switch (function) {
      case FUNC_INIT:
        CounterInit();
        break;
      case FUNC_PIN_STATE:
        result = CounterPinState();
        break;
    }
  }
  return result;
}

#endif  // USE_COUNTER