#include <Servo.h>
#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>




// Arduino coin acceptor code by Kuma McCraw
// Originally created for the Live Oak School Vending Machine
// Read your coin acceptor's specs and instructions first for hookup specifics
// Modifications to this code may be required for operation
// Coin acceptor model used in this example is CH-926
//
// xoxox
/* Constants
    cost of 1 corresponds to the cost of purchasing the invetory in slot 1
    cost of 2 is the cost of the inventory in slot 2
    cost of 3 is the cost of inventory in slot 3
    cost of 4 is the cost of inventory in slot 4
*/
/*The circuit
  LCD Enable pin to digital pin 11
  LCD D4 pin to digital pin 5
  LCD D5 pin to digital pin 4
  LCD D6 pin to digital pin 3
  LCD D7 pin to digital pin 2
  LCD R/W pin to ground
  10K resistor:
  ends to +5V and ground
  wiper to LCD VO pin (pin 3)

*/
// Servo's for each slot
LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
Servo slot1;
Servo slot2;
Servo slot3;
// Variables

int servopo3 = 0;
int servopo2 = 0;
int servopo1 = 0;

const int coinpin = 2;
const int cost1 = 100;

const int button1 = 3;
const int button2 = 4;
const int button3 = 5;

volatile int cents = 0;

volatile int pulses;

int credits = 0;

void setup() {
  slot1.attach(8);
  slot2.attach(7);
  slot3.attach(6);
  lcd.begin(16,2);
  lcd.clear();
  lcd.noAutoscroll();
  lcd.backlight();
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);
  pinMode(button3, INPUT);
  attachInterrupt(digitalPinToInterrupt(coinpin), coinInterrupt, RISING);

}
void coinInterrupt()
{
  pulses += 1;
  mydelay(1);
}

void translate(int pulses)
{
  int rc = pulses * 5;
  cents += rc;
}

void mydelay(float ss)
{
  int ms = 1000 * ss;
  return delay(ms);
}

// Main loop
void loop()
{
  mydelay(5);
  translate(pulses);
  pulses = 0;

  int button1state = digitalRead(button1);
  int button2state = digitalRead(button2);
  int button3state = digitalRead(button3);

  if (credits >= 2)
  {
    lcd.clear();
    lcd.print("to get item 1 ");
    lcd.setCursor(0,1);
    lcd.print("press button 1");

    if (button1state == HIGH)
    {
      // if button which correponds to that slot is pushed activate dispensing motor.
      slot1.writeMicroseconds(servopo1);
      credits -= 2;
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("bought item 1");
      mydelay(0.75);
      slot1.writeMicroseconds(1500);

    }

  }
  if (credits >= 2)
  {
    lcd.clear();
    lcd.print("to get item 2 ");
    lcd.setCursor(0,1);
    lcd.print("press button 2");

    if (button2state == HIGH)
    {
      slot2.writeMicroseconds(servopo2);
      credits -= 2;
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("you bought item 2");
      mydelay(0.75);
      slot2.writeMicroseconds(1500);

    }
    //if button which corresponds to that slot is pushed, activate dispensing motor for that slot.
  }
  if (credits >= 3)
  {
    lcd.clear();
    lcd.print("to get item 3 ");
    lcd.setCursor(0,1);
    lcd.print("press button 3");

    if (button3state == HIGH)
    {
      //move correspoding button specific amount of rotations
      slot3.writeMicroseconds(servopo3);
      credits -= 3;
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("you bought item 3");
      delay(1000);
      slot3.writeMicroseconds(1500);

    }
    // if button which correponds to that slot is pushed activate dispensing motor.
  }

  //If we've hit our target amount of coins, increment our credits and reset the cents counter

  if (cents >= cost1)
  {
    credits = credits + 1;
    cents = cents - cost1;
  }
  // If we haven't reached our target, keep waiting and display, "not enough money."
  else
  {
  if (credits == 0) {
      lcd.clear();
      lcd.print("not enough money");

    }
  }

  // Debugging zone
  lcd.clear();
  lcd.print(cents);
  lcd.print(" cents      || ");
  lcd.setCursor(0,1);
  lcd.print(credits);
  lcd.print(" credit(s)  ||");
  mydelay(1);

  // if the amount of credits needed for

}