/*  
  OpenMQTTGateway Addon  - ESP8266 or Arduino program for home automation 
   Act as a wifi or ethernet gateway between your 433mhz/infrared IR signal  and a MQTT broker 
   Send and receiving command by MQTT
 
    GPIO Input derived from HC SR-501 reading Addon and https://www.arduino.cc/en/Tutorial/Debounce

    This reads a high (open) or low (closed) through a circuit (switch, float sensor, etc.) connected to ground.

    Copyright: (c)Florian ROBERT
    
    Contributors:
    - 1technophile
    - QuagmireMan
  
    This file is part of OpenMQTTGateway.
    
    OpenMQTTGateway 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.
    OpenMQTTGateway 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/>.
*/
#include "User_config.h"

#ifdef ZsensorGPIOInput

unsigned long lastDebounceTime = 0;
int InputState = 3; // Set to 3 so that it reads on startup
int lastInputState = 3;

void setupGPIOInput() {
  Log.notice(F("Reading GPIO at pin: %d" CR), GPIOInput_PIN);
  pinMode(GPIOInput_PIN, INPUT_PULLUP); // declare GPIOInput pin as input_pullup to prevent floating. Pin will be high when not connected to ground
}

void MeasureGPIOInput() {
  int reading = digitalRead(GPIOInput_PIN);

  // check to see if you just pressed the button
  // (i.e. the input went from LOW to HIGH), and you've waited long enough
  // since the last press to ignore any noise:

  // If the switch changed, due to noise or pressing:
  if (reading != lastInputState) {
    // reset the debouncing timer
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > GPIOInputDebounceDelay) {
    // whatever the reading is at, it's been there for longer than the debounce
    // delay, so take it as the actual current state:
#  if defined(ESP8266) || defined(ESP32)
    yield();
#  endif
    // if the Input state has changed:
    if (reading != InputState) {
      InputState = reading;
      Log.trace(F("Creating GPIOInput buffer" CR));
      const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(1);
      StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
      JsonObject& GPIOdata = jsonBuffer.createObject();
      if (InputState == HIGH) {
        GPIOdata.set("gpio", "HIGH");
      }
      if (InputState == LOW) {
        GPIOdata.set("gpio", "LOW");
      }
      if (GPIOdata.size() > 0)
        pub(subjectGPIOInputtoMQTT, GPIOdata);
    }
  }

  // save the reading. Next time through the loop, it'll be the lastInputState:
  lastInputState = reading;
}
#endif