// C++ code
// Libraries
#include <Wire.h>
#include <LiquidCrystal_I2C.h> // done
#include <Servo.h> // converted to esp32servo360.h

// Initialize the LCD //done
LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address to 0x32 for a 16 chars and 2 line display //done

// Define servo pins //done
#define SERVO_PIN_1 9 //done
#define SERVO_PIN_2 10 //done
#define SERVO_PIN_3 11 //done

// Create servo objects
Servo servo1; //commented
Servo servo2; //commented
Servo servo3; //commented

// Define other pins //done
#define coinSlot 6 //done
#define coinSlotRGBFrame 2 //done
#define buzzer 13 //done
#define button1 4 //done
#define button2 7 //done
#define button3 8 //done
#define Enter 3 //done
#define back 12 //done

char lcdBuffer[16]; //done
char prefix[] = "Bal: Php"; //done
int pulse = 0; //done
char ZZ[] = ".00"; //done
int phase = 1; //done

// Define variant prices
const int prices[] = {5, 8, 10};  // Replace with the actual prices for variants //done
const int buttons[] = {button1, button2, button3}; //done
Servo* servos[] = {&servo1, &servo2, &servo3}; //done 

// Function prototypes 
void setup(); //done
void loop(); //done
void insertcoinpage(); //done
void startlcd(); //done
void checkCredits(); //done
void printCredits(); //done
void dispenseVariant(int index);
bool nextPhase(); // done
bool Cancel(); //done
void printSelectVariant(); //done
void activateServo(Servo* servo); //commented
void activateBuzzer(); //done


// Setup, initialize everything here
void setup() 
{
    startlcd(); //done
    pinMode(coinSlot, INPUT_PULLUP); //done
    pinMode(Enter, INPUT); //done
    pinMode(back, INPUT); //done
    for (int i = 0; i < 3; i++) { //done
        pinMode(buttons[i], INPUT); // Initialize button pins //done
    }

     // Attach and set initial position of servos to 0 degrees
    Servo* servoArray[] = {&servo1, &servo2, &servo3}; //commented
    int servoPins[] = {SERVO_PIN_1, SERVO_PIN_2, SERVO_PIN_3}; //commented
    for (int i = 0; i < 3; i++) { //commented
        servoArray[i]->attach(servoPins[i]); //commented
        servoArray[i]->write(0); // Set initial position to 0 degrees //commented
    } //commented
    
    insertcoinpage(); //done
}

// MAIN LOOP
void loop() { //done
    while (phase == 1) { //done
        checkCredits(); //done
        if (nextPhase()) break; //done  
    }   //done

    while (phase == 2) { //done
        printSelectVariant(); //done
        
        for (int i = 0; i < 3; i++) { // Loop to handle multiple variants  //done
            dispenseVariant(i); //done
        } //done
        if (Cancel()) { //done
            insertcoinpage(); // Reinitialize the insert coin page //done
            break; //done
        } //done
    } //done
} //done

// Functions

void insertcoinpage() // Function: prints "insert coin" //done
{
    lcd.setCursor(0, 0);
    lcd.print("              ");
    delay(200);
    lcd.setCursor(0, 0);
    lcd.print("  Insert  Coin");
    delay(100);
    printCredits();
}

void startlcd() // Function: turns on the LCD //done
{
    lcd.init();
    lcd.backlight();
    lcd.clear();
}

void checkCredits() // Function: coins to credits and prints actual credits //done
{
    if (digitalRead(coinSlot) == LOW) {
        pulse++;
        printCredits();
        activateBuzzer();
    }
}

void printCredits() // Function: only prints credits //done
{
    sprintf(lcdBuffer, "%s %d%s", prefix, pulse, ZZ);
    lcd.setCursor(0, 1);
    lcd.print(lcdBuffer);
}

void dispenseVariant(int index) // Function: handles variant dispensing //done
{
    if (digitalRead(buttons[index]) == HIGH) {
        if (pulse >= prices[index]) {
            lcd.clear();
            lcd.setCursor(0, 0);
            lcd.print("Dispensing...");
            delay(500);
            pulse -= prices[index];
            activateServo(servos[index]); //commented
            printCredits();
        } else {
            lcd.clear();
            lcd.setCursor(0, 0);
            lcd.print("  Insufficient");
            lcd.setCursor(0, 1);
            lcd.print("    Balance   ");
            delay(500);
            lcd.clear();
          	phase = 1;
          	insertcoinpage();
          	printCredits();
          
            
          	
        }
    }
}

bool nextPhase() // Function: moves to the next phase //done
{
    if (digitalRead(Enter) == HIGH) {
        phase += 1;
        return true; // Return true to indicate phase change
    }
    return false;
}

bool Cancel() // Function: cancels the operation //done
{
    if (digitalRead(back) == HIGH) {
        phase = 1;
        return true; // Return true to indicate cancellation
    }
    return false;
}

void printSelectVariant() // Function: prints "Select Variant" //done
{
    lcd.setCursor(0, 0);
    lcd.print("Select Variant");
    delay(100);
    lcd.setCursor(0, 0);
    lcd.print("              ");
    delay(100);
}

void activateServo(Servo* servo) // Function: activates a servo //commented
{
    servo->write(90); // Example position for activation
    delay(500); // Time for the servo to stay in position
    servo->write(0); // Return to initial position 
}

void activateBuzzer() // Function: activates the buzzer //done
{
  	tone(buzzer, 3000); // Set the buzzer to sound at 3000 Hz
    delay(20);          // Sound for 20 milliseconds
    noTone(buzzer);     // Stop the buzzer
    delay(40);          // Delay for 40 milliseconds
}