/*
  xsns_59_ds1624.ino - Support for I2C DS1624 Temperature Sensor

  Copyright (C) 2021  Leonid Myravjev <asm@asm.pp.ru>

  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_I2C
#ifdef USE_DS1624

/*********************************************************************************************\
 * DS1624, DS1621 - Temperature
 *
 * I2C Address: 0x48 - 0x4F
\*********************************************************************************************/

#define XSNS_59                 59
#define XI2C_42                 42  // See I2CDEVICES.md

#define DS1624_MEM_REGISTER    0x17  //only for ds1624, don't exists on 1621
#define DS1624_CONF_REGISTER   0xAC
#define DS1624_TEMP_REGISTER   0xAA
#define DS1624_START_REGISTER  0xEE
#define DS1624_STOP_REGISTER   0x22

#define DS1621_COUNTER_REGISTER   0xA8 //exists on 1621 and 1624(undocumented)
#define DS1621_SLOPE_REGISTER     0xA9 //exists on 1624 and 1624(undocumented)

#define DS1621_CFG_1SHOT     (1<<0)
#define DS1621_CFG_DONE      (1<<7)

enum {
  DS1624_TYPE_DS1624,
  DS1624_TYPE_DS1621
};

#define DS1624_MAX_SENSORS     8

bool ds1624_init = false;

struct {
  float   value;
  uint8_t type;
  int     errcnt;
  int     misscnt;
  bool    valid;
  char    name[9];
} ds1624_sns[DS1624_MAX_SENSORS];

uint32_t DS1624_Idx2Addr(uint32_t idx) {
  return 0x48 + idx;
}

void DS1624_Restart(uint8_t config, uint32_t idx) {
  uint32_t addr = DS1624_Idx2Addr(idx);
  if ((config & 1) == 1) {
    config &= ~(DS1621_CFG_DONE|DS1621_CFG_1SHOT);
    I2cWrite8(addr, DS1624_CONF_REGISTER, config);  // 1shot off
    delay(10);                                      // by spec after writing
    AddLog(LOG_LEVEL_ERROR, "%s addr %x is reset, reconfig: %x", ds1624_sns[idx].name, addr, config);
  }
  I2cValidRead(addr, DS1624_START_REGISTER, 1);
}

void DS1624_HotPlugUp(uint32_t idx)
{
  uint32_t addr = DS1624_Idx2Addr(idx);

  if (!I2cSetDevice(addr)) { return; }

  uint8_t config;
  if (I2cValidRead8(&config, addr, DS1624_CONF_REGISTER)) {
    uint8_t tmp;
    ds1624_sns[idx].type = (I2cValidRead8(&tmp, addr, DS1624_MEM_REGISTER)) ? DS1624_TYPE_DS1624 : DS1624_TYPE_DS1621;

    snprintf_P(ds1624_sns[idx].name, sizeof(ds1624_sns[idx].name), PSTR("DS162%c%c%d"),
      (ds1624_sns[idx].type == DS1624_TYPE_DS1621) ? '1' : '4', IndexSeparator(), idx);
    I2cSetActiveFound(addr, ds1624_sns[idx].name);

    ds1624_sns[idx].valid = true;
    ds1624_sns[idx].errcnt = 0;
    ds1624_sns[idx].misscnt = 0;
    DS1624_Restart(config,idx);
    AddLog(LOG_LEVEL_INFO, "Hot Plug %s addr %x config: %x", ds1624_sns[idx].name, addr, config);
  }
}

void DS1624_HotPlugDown(int idx)
{
  uint32_t addr = DS1624_Idx2Addr(idx);
  if (!I2cActive(addr)) { return; }
  I2cResetActive(addr);
  ds1624_sns[idx].valid = false;
  AddLog(LOG_LEVEL_INFO, "Hot UnPlug %s", ds1624_sns[idx].name);
}

bool DS1624GetTemp(float *value, int idx)
{
  uint32_t addr = DS1624_Idx2Addr(idx);

  uint8_t config;
  if (!I2cValidRead8(&config, addr, DS1624_CONF_REGISTER)) {
    ds1624_sns[idx].misscnt++;
    AddLog(LOG_LEVEL_INFO, "%s device missing (errors: %i)", ds1624_sns[idx].name, ds1624_sns[idx].misscnt);
    return false;
  }
  ds1624_sns[idx].misscnt=0;
  if (config & (DS1621_CFG_1SHOT|DS1621_CFG_DONE)) {
    ds1624_sns[idx].errcnt++;
    AddLog(LOG_LEVEL_INFO, "%s config error, restart... (errors: %i)", ds1624_sns[idx].name, ds1624_sns[idx].errcnt);
    DS1624_Restart(config, idx);
    return false;
  }

  uint16_t t;
  if (!I2cValidRead16(&t, DS1624_Idx2Addr(idx), DS1624_TEMP_REGISTER)) { return false; }
  if (ds1624_sns[idx].type == DS1624_TYPE_DS1624) {
    *value = ((float)(int8_t)(t>>8)) + ((t>>4)&0xf)*0.0625f;
  } else { //type == DS1624_TYPE_DS1621
    // Datasheet for ds1621 is wrong for high resolution, real is:
    *value = ((float)(int8_t)(t>>8));
    uint8_t remain;
    if (!I2cValidRead8(&remain, addr, DS1621_COUNTER_REGISTER)) { return true; }
    uint8_t perc;
    if (!I2cValidRead8(&perc, addr, DS1621_SLOPE_REGISTER)) { return true; }
    float fix=(float)(perc - remain)/(float)perc;
    *value+=fix;
  }
  ds1624_sns[idx].errcnt=0;
  config &= ~(DS1621_CFG_DONE);
  I2cWrite8(addr, DS1624_CONF_REGISTER, config);
  return true;
}

void DS1624HotPlugScan(void)
{
  uint16_t t;

  for (uint32_t idx = 0; idx < DS1624_MAX_SENSORS; idx++) {
    uint32_t addr = DS1624_Idx2Addr(idx);
    if (I2cActive(addr) && !ds1624_sns[idx].valid) {
      continue;  // is busy by another driver
    }
    if (ds1624_sns[idx].valid) {
      if ((ds1624_sns[idx].misscnt>2)||(ds1624_sns[idx].errcnt>2)) {
        DS1624_HotPlugDown(idx);
        continue;
      }
    }
    DS1624_HotPlugUp(idx);
  }
}

void DS1624EverySecond(void)
{
  float t;
  for (uint32_t i = 0; i < DS1624_MAX_SENSORS; i++) {
    if (!ds1624_sns[i].valid) { continue; }
    if (!DS1624GetTemp(&t, i)) { continue; }
    ds1624_sns[i].value = ConvertTemp(t);
  }
}

void DS1624Show(bool json)
{
  bool once = true;

  for (uint32_t i = 0; i < DS1624_MAX_SENSORS; i++) {
    if (!ds1624_sns[i].valid) { continue; }

    if (json) {
      ResponseAppend_P(JSON_SNS_F_TEMP, ds1624_sns[i].name, Settings->flag2.temperature_resolution, &ds1624_sns[i].value);
      if ((0 == TasmotaGlobal.tele_period) && once) {
#ifdef USE_DOMOTICZ
        DomoticzFloatSensor(DZ_TEMP, ds1624_sns[i].value);
#endif  // USE_DOMOTICZ
#ifdef USE_KNX
        KnxSensor(KNX_TEMPERATURE, ds1624_sns[i].value);
#endif // USE_KNX
        once = false;
      }
#ifdef USE_WEBSERVER
    } else {
      WSContentSend_Temp(ds1624_sns[i].name, ds1624_sns[i].value);
#endif  // USE_WEBSERVER
    }
  }
}

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

bool Xsns59(uint32_t function)
{
  if (!I2cEnabled(XI2C_42)) { return false; }

  bool result = false;

  if (FUNC_INIT == function) {
    if (!ds1624_init) {
      memset(ds1624_sns, 0, sizeof(ds1624_sns));
      ds1624_init = true;
      DS1624HotPlugScan();  // If HotPlug is off
    }
  }
  switch (function) {
    case FUNC_HOTPLUG_SCAN:
      DS1624HotPlugScan();
      break;
    case FUNC_EVERY_SECOND:
      DS1624EverySecond();
      break;
    case FUNC_JSON_APPEND:
      DS1624Show(1);
      break;
#ifdef USE_WEBSERVER
    case FUNC_WEB_SENSOR:
      DS1624Show(0);
      break;
#endif  // USE_WEBSERVER
  }
  return result;
}

#endif  // USE_DS1624
#endif  // USE_I2C
