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

LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 20, 4);  // Change to (0x27,20,4) for 20x4 LCD.
int period = 100; //time between increments- currently set to tenths of a second
float secondCounter = 0; //counts number of times the pump comes on- not currently implemented
int floatSwitchPin = 7; //which pin the float switch is connected to

boolean pumpOn = false; // State of the pump- starts as "off" (False) and switches to "on" (True when pin7 is shorted to ground)
boolean lastPumpState = false;

float onTimeAccumulator = 3599; // total amount of time the pump is on
float offTimeAccumulator = 3599; // total amount of time the pump is off


void setup() {
  //start LCD screen
  lcd.init();
  lcd.backlight();
  // Initialize sensor pin
  pinMode(floatSwitchPin, INPUT_PULLUP);
  // Open Serial monitor for debugging
  Serial.begin(9600);
}

void loop() {
  unsigned long time_now = millis();
  if (pumpOn == true) { // Check to see if the pump is on
    onTimeAccumulator = onTimeAccumulator + 0.1; //increase the onTimeAccumulator by 0.1 seconds each loop when pump is on
  }
  else { //pump is off
    offTimeAccumulator = offTimeAccumulator + 0.1; //increase the offTimeAcccumulator by 0.1 seconds each loop when pump is off
  }

  //Debugging Serial Print Statements
  printTime(0, 0, onTimeAccumulator);
  printTime(0, 1, offTimeAccumulator);
  /*  Serial.print("onTimeAccumulator=");
      Serial.print(onTimeAccumulator);
      Serial.print("  offTimeAccumulator=");
      Serial.print(offTimeAccumulator);
      Serial.print("  pumpOn=");
      Serial.println(pumpOn);
  */

  while (millis() < time_now + period) { //non blocking delay
    pumpOn = !digitalRead(floatSwitchPin);
  }
}


void printTime(int x, int y, float seconds) { //Convert Seconds into user friendly display of HH:MM:SS.T
  if (secondsToHours(seconds) > 99) {
    x = x + 1; //If Seconds is bigger than 99 move over one column
  }
  lcd.setCursor(x, y);              // Set col 0
  if (secondsToHours(seconds) < 10) { //if hours is less than 10 add a leading 0
    lcd.print("0");                 //After print move to col 1
    //lcd.setCursor(x + 1, y); //move over one column   Set col 1 (unnecessary)
  }
  lcd.print(secondsToHours(seconds)); //print number of hours (using subroutine below)
  lcd.setCursor(x + 2, y); //move over 2 columns  // Set col 2
  lcd.print(":"); //print the colon    //After print move to col 3
  //lcd.setCursor(x + 3, y); //move over 3 columns    Set col 3 (unnecessary)
  if (secondsToMinutes(seconds) - (secondsToHours(seconds) * 60) < 10) { //if number of minutes is less than 10 add a deading 0
    lcd.print("0");     //After print move to col 4
  //  lcd.setCursor(x + 4, y); //move over    Set col 4 (unnecessary)
  }
  lcd.print(secondsToMinutes(seconds) - (secondsToHours(seconds) * 60)); //print number of minutes (minus minutes accounted for as hours)
  lcd.setCursor(x + 5, y); //position cursor   Set col 5
  lcd.print(":"); //print colon //After print move to col 6
  //lcd.setCursor(x + 6, y); // position cursor  Set col 6 (unnecessary)

  // I don't understand what should happen with this part.
   // I have modify to avoid neg. numbers
// ==========================================================================
/*
  if (secondCounter - ((secondsToMinutes(seconds) * 60) + secondsToHours(seconds) * 3600) < 10) { //if number of seconds (minus seconds accounted for as minutes and as hours) is less than 10 add a leading zero
    lcd.print("0"); //add a leading zeor
    lcd.setCursor(x + 7, y); //move the cursor over
  }
  lcd.print(secondCounter - (((secondsToMinutes(seconds) * 60) + secondsToHours(seconds) * 3600)), 1); //print number of seconds (minus seconds accounted for as hours and minutes)
*/
// ==========================================================================
  float newSecondCounter = secondCounter - ((secondsToMinutes(seconds) * 60) + secondsToHours(seconds) * 3600);
  if (newSecondCounter < 0 )
    newSecondCounter = newSecondCounter * -1;
  if (newSecondCounter < 10) { //if number of seconds (minus seconds accounted for as minutes and as hours) is less than 10 add a leading zero
    lcd.print("0"); //add a leading zeor   //After print move to col 7
  //  lcd.setCursor(x + 7, y); //move the cursor over   Set col 7 (unnecessary)
  }
  lcd.setCursor(x + 6, y); //move the cursor over
  lcd.print(newSecondCounter, 1); //print number of seconds (minus seconds accounted for as hours and minutes)
 // ===========================================================================

}

int secondsToMinutes(float seconds) { //converts seconds into minutes
  int minutes;
  minutes = floor(seconds / 60);
  return (minutes);
}

int secondsToHours(float seconds) { //converts seconds into hours
  int hours;
  hours = floor(seconds / 3600);
  return (hours);
}