#include <Ticker.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>
#include <WiFi.h>
#include "time.h"

#define OLED_RESET -1
#define row 4 // four rows
#define col 4 // four columns
#define LED 13

String str;
String Alarm[100];
int click = 0;
int row_click = 0;
int col_click = 0;
int counter_delay = 0;
bool capslock;

char keys[row][col] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte row_pin[row] = {18, 5, 32, 33}; // GIOP19, GIOP5, GIOP32, GIOP33 connect to the row pins
byte col_pin[col] = {25, 26, 27, 14}; // GIOP25, GIOP26, GIOP27, GIOP14 connect to the column pins
Ticker timer;

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

// create an OLED display object connected to I2C
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

int ledState = HIGH; // the current state of the output pin
int buttonState; // the current reading from the input pin
int lastButtonState = LOW; // the previous reading from the input pin

// the following variables are unsigned longs because the time, measured in
// milliseconds, will quickly become a bigger number than can be stored in an int.
unsigned long lastDebounceTime = 0; // the last time the output pin was toggled
unsigned long debounceDelay = 50; // the debounce time; increase if the output flickers

const char* ssid = "adzkiakhns";
const char* password = "Creamy123";
const char* ntpServer = "pool.ntp.org";
const long gmtOffset_sec = 0;
const int daylightOffset_sec = 3600;
int N = 0;
String code = "A";
int kedip = 0;

void setup() {
  pinMode(LED, OUTPUT);
  digitalWrite(LED, LOW);
  Serial.begin(115200);
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }
  for (int i = 0; i < 4; i++) {
    pinMode(col_pin[i], INPUT_PULLUP);
    pinMode(row_pin[i], OUTPUT);
  }
  Serial.println(ssid);
  //  WiFi.begin(ssid, password);
 WiFi.begin("Adzkia Khansa:", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected.");
  display.clearDisplay();
  display.setTextSize(2); // set text size
  display.setTextColor(WHITE); // set text color
  display.setCursor(0,0);
  display.println("Adzkia Khansa Meara");
  display.setTextSize(1);
  display.setCursor(0, 16);
  display.print("21/473474/TK/52182");
  display.display();
  display.clearDisplay();
  delay(3000);

  // Init and get the time
  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
  printLocalTime();

  //disconnect WiFi as it's no longer needed
  WiFi.disconnect(true);
  WiFi.mode(WIFI_OFF);
  
}

void timerCallback() {
  counter_delay++;
}

void loop() {
  getKey();
  digitalWrite(LED, HIGH);
}

void printAlarm() {
  display.clearDisplay();
  display.setTextSize(2); // set text size
  display.setTextColor(WHITE); // set text color
  display.setCursor(0, 2);
  String temp = Alarm[0];
  String jam = temp.substring(0,2);
  Serial.println(jam);
  display.println("List Alarm");
  for (int i = 0; i < N; i++) {
    display.println(Alarm[i]); // set text
  }
  display.display();
}
char timeHour[3];
char timeMinute[3];
char timeSecond[3];
void printLocalTime() {
  delay(1000);
    checkAlarm();

  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    Serial.println("Failed to obtain time");
    return;
  }
  display.clearDisplay();
  display.setTextSize(2); // set text size
  display.setTextColor(WHITE); // set text color
  display.setCursor(0, 2);
  display.println( &timeinfo, "%A, %B %d %Y %H:%M:%S");
  display.display();
  
  strftime(timeHour, 3, "%H", &timeinfo);
  strftime(timeMinute, 3, "%M", &timeinfo);
  strftime(timeSecond, 3, "%S", &timeinfo);
  char timeWeekDay[10];
  strftime(timeWeekDay, 10, "%A", &timeinfo);
}

void addAlarm() {
  display.clearDisplay();
  display.setTextSize(2); // set text size
  display.setTextColor(WHITE); // set text color
  display.setCursor(0, 2);
  display.println("Input Alarm Time:");
  int panjangStr = str.length();
  if (panjangStr == 2 || panjangStr == 5) {
    str += ":";
  }
  display.println(str);
  display.display();
}
bool nyala = false;

void checkAlarm(){
      Serial.println("timeHourcheck");
  for(int i=0;i<N;i++){
      String temp = Alarm[i];
      String jam = temp.substring(0,2);
      String menit = temp.substring(3,5);
      String detik = temp.substring(6,8);
      String timeHourcheck(timeHour);
      String timeMinutecheck(timeMinute);
      String timeSecondcheck(timeSecond);
      if(nyala && kedip < 26){
        digitalWrite(LED, HIGH);
        delay(400); 
        digitalWrite(LED, LOW);
        delay(400); 
        kedip++;
      }else {
        nyala = false;
        kedip = 0;
      }
      if(timeHourcheck == jam && timeMinutecheck == menit && timeSecondcheck == detik && kedip < 26){
          digitalWrite(LED, HIGH);
          delay(400); 
          digitalWrite(LED, LOW);
          delay(400); 
          kedip++;
          nyala = true;
      }
  }
}

void getKey() {
  if(code == "A"){
    printLocalTime();
  }else if(code == "B"){
    addAlarm();
  }else if(code == "C"){
    printAlarm();
  }
//printLocalTime();
  for (int r = 0; r < 4; r++) {
    digitalWrite(row_pin[r], LOW);
    for (int i = 0; i < 4; i++) {
      if (i != r) digitalWrite(row_pin[i], HIGH);
    }
    for (int c = 0; c < 4; c++) {
      if (digitalRead(col_pin[c]) == LOW) {
        if (c == 3 && r == 0) {
          code = "A";
        } else if (c == 3 && r == 1) {
          code = "B";
        } else if (c == 3 && r == 2) {
          code = "C";
        } else if (c == 3 && r == 3) {
          Alarm[N] = str;
          N++;
          str = "";
        }else if(c == 2 && r == 3){
          str.remove(str.length() - 1);
          } else {
          str = str + keys[r][c];
        }
        delay(400);
      }
    }
  }
}