#include "esphome.h"

const int PIN_METER = D3;

int previousState = 0;
int currentState = 0;

long pulseCount = 0;

unsigned long pulseTime, lastTime;
unsigned long debounceDelay = 50000;

double power, elapsedkWh;

int ppkWh = 1500;

class EnergyMeterSensor : public Component, public Sensor {
 public:
  Sensor *power_sensor = new Sensor();
  Sensor *elapsedkWh_sensor = new Sensor();

  void setup() override
  {
    pinMode(PIN_METER, INPUT);
    digitalWrite(PIN_METER, HIGH);
  }
  void loop() override {
    currentState = digitalRead(PIN_METER);
    if (currentState != previousState)
    {
      digitalWrite(LED_BUILTIN, currentState);
      if (currentState == LOW)
      {
        lastTime = pulseTime;
        pulseTime = micros();

        if ((pulseTime - lastTime) > debounceDelay) {
          pulseCount++;

          power = (3600000000000.0 / (pulseTime - lastTime)) / ppkWh;

          elapsedkWh = (1.0 * pulseCount / (ppkWh));

          power_sensor->publish_state(power);
          elapsedkWh_sensor->publish_state(elapsedkWh);
        }
      }
      previousState = currentState;
    }
  }
};