#include "Wire.h"               // Library for I2C communication
#include "LiquidCrystal_I2C.h"  // Library for LCD
#include <Toggle.h>

LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 20, 4);  // Change to (0x27,20,4) for 20x4 LCD.
const byte floatSwitchPin = 7; //which pin the float switch is connected to
Toggle floatSwitch;

unsigned long onTime = 0; // in ms
unsigned long startTime = 0; // in ms

enum {PUMP_OFF, PUMP_ON} pumpState = PUMP_OFF;

void printTime(unsigned long t) {
  unsigned long h = t / 3600ul;
  unsigned long m = (t % 3600ul) / 60ul;
  unsigned long s = (t % 3600ul) % 60ul;
  if (h < 10) lcd.write('0');
  lcd.print(h);
  lcd.write(':');
  if (m < 10) lcd.write('0');
  lcd.print(m);
  lcd.write(':');
  if (s < 10) lcd.write('0');
  lcd.print(s);
}

void show() {
  lcd.setCursor(0, 1);
  printTime(onTime / 1000ul);

  lcd.setCursor(12, 1);
  if (pumpState == PUMP_OFF) printTime(0);
  else  printTime((millis() - startTime) / 1000ul);// get rid of the ms
}

void setup() {
  floatSwitch.begin(floatSwitchPin);
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("CUMULATED   ONGOING");
}

void loop() {
  show();
  floatSwitch.poll();
  switch (pumpState) {
    case PUMP_OFF: // check if the float switch is activated
      if (floatSwitch.onPress()) {
        startTime = millis();
        pumpState = PUMP_ON;
      }
      break;

    case PUMP_ON:
      if (floatSwitch.onRelease()) {
        onTime += (millis() - startTime);
        startTime = 0;
        pumpState = PUMP_OFF;
      }
      break;
  }
}