#include <LiquidCrystal.h>

enum State
{ 
Idle,

};

const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2; // pin 3 of LCD should be connected to GND
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

const int relay1 = 6;  // VCC Pin attached to Digital Pin 13, Glycol Pump
const int relay2 = 7;  // VCC Pin attached to Digital Pin 12, Water Pump
const int relay3 = 8;  // VCC Pin attached to Digital Pin 11, Glycol Intake Solenoid Valve
const int relay4 = 9;  // VCC Pin attached to Digital Pin 10, Water Intake Solenoid Valve
const int relay5 = 10;  // VCC Pin attached to Digital Pin 9, Glycol Output Solenoid Valve
const int relay6 = 23;  // VCC Pin attached to Digital Pin 8, Water Output Solenoid Valve
const int relay7 = 25;  // VCC Pin attached to Digital Pin 7, Electric Motor Agitator
const int relay8 = 27; //VCC Pin attached to Digital Pin 6, Mixed Output Solenoid Valve
const int momentary_switch = 52; // pushbutton connected to pin 1 of aurdino board
const int latchingSwitchInputPin = 52;
const int latchingSwitchOutputPin = 3; // Arduino pin connected to relay's pin
const int LED = 51;

const int Glycol_max_sensor = 0; //Pushbutton 
const int Glycol_min_sensor = 1; //Pushbutton 
const int Water_max_sensor = 14; //Pushbutton 
const int Water_min_sensor = 15; //Pushbutton 

int counter;

int switchState = LOW; // Variables to store switch states
int lastSwitchState = LOW; // Variables to store switch states
int latchingSwitchState = LOW; // Variables to store switch states
int Glycol_max_sensor_state = HIGH ;
int Glycol_min_sensor_state = HIGH ;
int Water_max_sensor_state = HIGH ;
int Water_min_sensor_state = HIGH ; 

// Initialize current state
State currentState = Idle;

void startup();
void Intake_Valve();
void Output_Valve();
void Electric_Motor();
void Mix_Output_Solenoid_Valve();



void setup() 
{
  lcd.begin(16, 2);
  // you can now interact with the LCD, e.g.:
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
  pinMode(relay3, OUTPUT);
  pinMode(relay4, OUTPUT);
  pinMode(relay5, OUTPUT);
  pinMode(relay6, OUTPUT);
  pinMode(relay7, OUTPUT);
  pinMode(relay8, OUTPUT);

  pinMode(momentary_switch, INPUT); // set arduino pin to input mode
  pinMode(latchingSwitchInputPin, INPUT);
  pinMode(latchingSwitchOutputPin, OUTPUT);

  pinMode(LED, OUTPUT); // set arduino pin to input mode

  pinMode(Glycol_max_sensor, INPUT_PULLUP);
  pinMode(Glycol_min_sensor, INPUT_PULLUP);
  pinMode(Water_max_sensor, INPUT_PULLUP);
  pinMode(Water_min_sensor, INPUT_PULLUP);

  Serial.begin(115200);
}

void loop()
{
  power_on();
  // Read the state of the momentary switch
  switchState = digitalRead(momentary_switch);


  // Check for a rising edge (transition from LOW to HIGH) on the momentary switch
  if (switchState == HIGH && lastSwitchState == LOW) {
    // Toggle the state of the latching switch
    latchingSwitchState = !latchingSwitchState;
    delay(1000);
    digitalWrite(relay1, latchingSwitchState);
    digitalWrite(relay2, latchingSwitchState);   
    digitalWrite(LED, latchingSwitchState);
    Serial.println("Toggle Latching Switch");   
}
     // Update the last switch state
   lastSwitchState = switchState;



  Serial.println("\n"); 

  switch (counter)
  {
  case 0: {  
            int Glycol_max_sensor_state = digitalRead(Glycol_max_sensor);
            int Glycol_min_sensor_state = digitalRead(Glycol_min_sensor);
            int Water_max_sensor_state = digitalRead(Water_max_sensor);
            int Water_min_sensor_state = digitalRead(Water_min_sensor);  
            lcd.print("Starting UP");
            delay(1000);
            lcd.clear();
  
            lcd.print("Would you like");
            lcd.setCursor(0, 1);
            lcd.print("to proceed?");
            lcd.clear();
  

            if(switchState == HIGH)
            {
              if (Glycol_min_sensor_state == HIGH && Water_min_sensor_state == HIGH)
              {
                startup();
              }
            counter = 1;
            millis();
}


          
           }

  /*case 1: { Intake_Valve();
            counter = 2;
            millis();
            break;}

  case 2: {  Output_Valve();
              counter = 3;
            millis();
            break;}

  case 3: {  Electric_Motor();
            counter = 4;
            millis();
            break;}

  case 4: { Mix_Output_Solenoid_Valve();
            counter = 0;
            millis();
            break;}*/
}
}

void power_on()
{
  digitalWrite(relay1, LOW); 
  digitalWrite(relay2, LOW); 
  digitalWrite(relay3, LOW); 
  digitalWrite(relay4, LOW); 
  digitalWrite(relay5, LOW); 
  digitalWrite(relay6, LOW); 
  digitalWrite(relay7, LOW); 
  digitalWrite(relay8, LOW); 
  digitalWrite(LED, LOW);
  //buttonState = LOW;
  latchingSwitchState= LOW;
}

void startup()
{

}