#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>

const byte ROWS = 4;
const byte COLS = 4;

char Keys [ROWS] [COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

byte rowpins[ROWS] = {2,3,4,5};
byte colpins[COLS] = {6,7,8,9};

Keypad mykeypad = Keypad(makeKeymap(Keys), rowpins, colpins, ROWS, COLS);

LiquidCrystal_I2C lcd(0x27, 20, 4);

char products[4][7] = {"CHIPS", "WATER", "COKE", "COOKIE"};
char command[4][2]  = {"1", "2", "3", "4"};

Servo ServoChips;
Servo ServoWater;
Servo ServoCoke;
Servo ServoCookie;

void setup() {
  // put your setup code here, to run once:
  lcd.init();      
  lcd.backlight();

  ServoChips.attach(10);
  ServoWater.attach(11);
  ServoCoke.attach(12);
  ServoCookie.attach(13);   

  ServoChips.write(0);
  ServoWater.write(0);
  ServoCoke.write(0);
  ServoCookie.write(0);
}

void loop() {
  list();

  char keyData = mykeypad.getKey();

  if (keyData) { // check if a key is pressed
    if (keyData == command[0][0]) {
      Chips();
    } 
    else if (keyData == command[1][0]) {
      Water();
    } 
    else if (keyData == command[2][0]) {
      Coke();
    } 
    else if (keyData == command[3][0]) {
      Cookie();
    } 
    else {
      none();
    }
  }
}

void list(){

  lcd.setCursor(0, 0);
  lcd.print(products[0]);
  lcd.setCursor(8, 0);
  lcd.print("= ");
  lcd.print(command[0]);

  lcd.setCursor(0, 1);
  lcd.print(products[1]);
  lcd.setCursor(8, 1);
  lcd.print("= ");
  lcd.print(command[1]);

  lcd.setCursor(0, 2);
  lcd.print(products[2]);
  lcd.setCursor(8, 2);
  lcd.print("= ");
  lcd.print(command[2]);

  lcd.setCursor(0, 3);
  lcd.print(products[3]);
  lcd.setCursor(8, 3);
  lcd.print("= ");
  lcd.print(command[3]);

}

void Chips() {

  lcd.clear();
  lcd.print(products[0]);
  lcd.print(" dispensing...");
  delay(500);
  ServoChips.write(180);
  delay(1000);
  ServoChips.write(0);
  lcd.clear();

}

void Water() {

  lcd.clear();
  lcd.print(products[1]);
  lcd.print(" dispensing...");
  delay(500);
  ServoWater.write(180);
  delay(1000);
  ServoWater.write(0);
  lcd.clear();

}

void Coke() {

  lcd.clear();
  lcd.print(products[2]);
  lcd.print(" dispensing...");
  delay(500);
  ServoCoke.write(180);
  delay(1000);
  ServoCoke.write(0);
  lcd.clear();

}

void Cookie() {

  lcd.clear();
  lcd.print(products[3]);
  lcd.print(" dispensing...");
  delay(500);
  ServoCookie.write(180);
  delay(1000);
  ServoCookie.write(0);
  lcd.clear();

}
void none() {

  lcd.clear();
  lcd.print("No such product!");
  delay(1500);
  lcd.clear();
  
}