#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);


#define buzzer A2
#define uv 2
#define Clock 9
#define Data 8
#define Push 10

// menu position
int menuPos = 0;
// last menu position
int lastMenuPos = 0;
// how many menues are
int menuMax = 2;
// motor speed
int motorSpeed = 0;
// curing time
int curingTime = 0;


unsigned long currentTime = 0;
unsigned long recordTime = 0;
unsigned long diffTime = 0;

int menuOption = 0;                    //Use this variable to store "steps"
int currentStateClock;              //Store the status of the clock pin (HIGH or LOW)
int lastStateClock;                 //Store the PREVIOUS status of the clock pin (HIGH or LOW)
String currentDir = "";             //Use this to print text
unsigned long lastButtonPress = 0;  //Use this to store if the push button was pressed or not


void setup() {
  Serial.begin(9600);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  delay(2000);
  display.clearDisplay();

  pinMode(buzzer, OUTPUT);
  pinMode(uv, OUTPUT);
  digitalWrite(uv, LOW);

  pinMode(Clock, INPUT_PULLUP);
  pinMode(Data, INPUT_PULLUP);
  pinMode(Push, INPUT_PULLUP);
  lastStateClock = digitalRead(Clock);
}

bool haveChange = false;

void loop() {

  currentStateClock = digitalRead(Clock);
  //Serial.println(currentStateClock);
  if (currentStateClock != lastStateClock && currentStateClock == LOW ) {
    haveChange = true;
    if (digitalRead(Data)) {
      menuOption ++;
      currentDir = "Counterclockwise";
      menuOption = setCorrectValue(menuOption);
    } else {
      // Encoder is rotating CW so increment
      menuOption --;
      currentDir = "Clockwise";
      menuOption = setCorrectValue(menuOption);
    }
  }
  lastStateClock = currentStateClock;

  if (haveChange) {
    Serial.print(menuOption);
    lcd_menu(menuOption);
    Serial.print("\n");
    haveChange = false;
  }


  /////////////////////////////

  //lcd_menu(menuOption);
  /*
    if(menuOption == 0){
      displayText("Motor spd");
    }else if(menuOption == 1){
      displayText("Curing spd");
    }else if(menuOption == 2){
      displayText("Start");
    }else{
      Serial.println("Err");
    }
  */
  /////////////////////////////

  // Getting time using millis
  currentTime = millis();
  diffTime = currentTime - recordTime;

  if (diffTime >= 10000UL) {
    recordTime = currentTime;

    //buzzerNotify();
  }

  if (diffTime >= 5000UL) {
    recordTime = currentTime;
    //uv_led();
  }

}

int setCorrectValue(int value) {
  if (value > menuMax) {
    value = 0;
  }

  if (value < 0) {
    value = menuMax;
  }

  return value;
}

void uv_led() {
  //Serial.println("UV LED ON");
  digitalWrite(uv, LOW);
}

void buzzerNotify() {
  int interval = 0;
  while (true) {
    tone(buzzer, 1000);
    delay(500);
    noTone(buzzer);
    delay(500);
    interval++;
    if (interval == 5) {
      break;
    }
  }

}

int lcd_menu(int option) {

  Serial.println(option);
  //Serial.print("\n");

  switch (option) {
    case 0:
      displayText("Motor spd");
      //motorMenu();
      break;
    case 1:
      displayText("Curing spd");
      //curingMenu();
      break;
    case 2:
      displayText("Start");
      //curingMenu();
      break;
    default:
      displayText("Error");
      break;

  }

}

void motorMenu() {
  /*
    for(int i = 0; i <= 100; i++){
      display.clearDisplay();
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.invertDisplay(true);
      display.clearDisplay();
      display.setCursor(1, 5);
      display.println("Motor speed settings");
      display.display();
      display.setTextSize(5);
      display.setTextColor(WHITE);
      display.invertDisplay(true);
      display.setCursor(32, 20);
      display.println(i);
      display.display();

      delay(25);
    }


    delay(1000);
  */
}

void curingMenu() {
  /*
    for(int i = 0; i <= 100; i++){
      display.clearDisplay();
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.invertDisplay(true);
      display.clearDisplay();
      display.setCursor(1, 5);
      display.println("Curing time settings");
      display.display();
      display.setTextSize(5);
      display.setTextColor(WHITE);
      display.invertDisplay(true);
      display.setCursor(32, 20);
      display.println(i);
      display.display();

      delay(25);
    }


    delay(1000);

  */
}

void displayText(String text) {
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.invertDisplay(true);
  display.clearDisplay();
  display.setCursor(5, 24);
  display.println(text);
  display.display();
  //delay(1);
}