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



#define SCREEN_WIDTH 128 //OLEDcdisaplay width , in pixels
#define SCREEN_HEIGHT 64  // OLED dispaly height ,  in pixels
#define OLED_RESET   -1  // Reset pin  # (or  -1 if  sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C /// < See datasheet for address ;  0x3D for 128x64 , 0x3C for 128x32

//Declare objects
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
//Global Variables
int days = 0;
int hours = 0;
int minutes = 0;
int seconds = 0;

unsigned timeNow = 0;
unsigned timeLast = 0;

bool alarm_enabled = true;
int n_alarms = 2;
int alarm_hours[] = {0, 1}; //initial alarm hours
int alarm_minutes[] = {1, 10};
int alarm_triggered[] = {false, false}; //keep track alarm is turn off

#define  BUZZER 5
#define LED_1 15
#define PB_CANCEL 34

int n_notes = 8;
int C = 262;
int D = 294;
int E = 330;
int F = 349;
int G = 392;
int A = 440;
int B = 494;
int C_H = 523;
int notes[8] = {C, D, E, F, G, A, B, C_H};

void  setup() {

  pinMode(BUZZER, OUTPUT);
  pinMode(LED_1, OUTPUT);
  pinMode(PB_CANCEL, OUTPUT);


  Serial.begin(9600);
  //put the setup code here to run once:
  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation faild"));
    for (;;); //Don't procced , loop forever
  }
  //show initial display buffer contents on the screen---
  //the library initializes this with an Adafruit splash screen
  display.display();
  delay(2000); // pause for 2 seconds

  //clear the buffer
  display.clearDisplay();
  print_line("Welcome to medibox", 10, 20, 2);
  display.clearDisplay();

}


void loop() {
  update_time_with_check_alarm();
  //delay(10); // this speeds up the simulation
}


void print_line(String text, int column, int row, int text_size) {
  display.setTextSize(text_size); // Noraml 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(column, row);
  display.println(text);
  display.display();

  //delay(2000);
}


void print_time_now(void) {
  display.clearDisplay();
  print_line(String(days), 0, 0, 2); //called casting convert strings values into string
  print_line(":", 20, 0, 2);
  print_line(String(hours), 30, 0, 2);
  print_line(":", 50, 0, 2);
  print_line(String(minutes), 60, 0, 2);
  print_line(":", 80, 0, 2);
  print_line(String(seconds), 90, 0, 2);

}

void update_time() {
  timeNow = millis() / 1000; //seonds pass from bootup//millis Returns the number of milliseconds passed since the Arduino board began running the current program. This number will overflow (go back to zero), after approximately 50 days.
  seconds = timeNow - timeLast;// print vema seconds gana eka equal venava time now - time last ta tme last increase karanava every minuits sarayakma thappara sankaya valin

  if (seconds >= 60) {
    minutes += 1 ;
    timeLast += 60;
  }

  if (minutes == 60) {
    hours += 1;
    minutes = 0;
  }

  if (hours == 24) {
    days += 1;
    hours = 0;
  }
}


void ring_alarm() {
  display.clearDisplay();
  print_line("MEDICINE TIME!", 0, 0, 2);

  digitalWrite(LED_1, HIGH); //ligh up the  LE

  bool break_happen = false;//to stop while statment
  //Ring the BUZZER
  while (break_happen == false && digitalRead(PB_CANCEL) == HIGH) {
    for (int i = 0; i <=n_notes; i++) {
      if (digitalRead(PB_CANCEL) == LOW) {
        delay(200);//prevent bouncing of the push button //while need to be stop >fast push kale nathotho aye aye ebenavane
        break_happen = true;
        break;//stop for statement
      }
      tone(BUZZER, notes[i]);
      delay(500);
      noTone(BUZZER);
      delay(2);
    }
  }

  digitalWrite(LED_1, LOW);
  display.clearDisplay();

}

void update_time_with_check_alarm(void) {
  update_time();
  print_time_now();

  if (alarm_enabled == true) {
    for (int i = 0; i < n_alarms; i++) {
      if (alarm_triggered[i] == false && alarm_hours[i] == hours && alarm_minutes[i] == minutes) {
        ring_alarm();
      }
    }
  }
}