#include <NTPClient.h>
#include <ESP8266WiFi.h>
#include <WiFiClientSecure.h> 
#include <ESP8266WebServer.h>
#include <WiFiUdp.h>

#include <Wire.h>  // I2C library already built in Arduino IDE
#include <LiquidCrystal_I2C.h> //library via Include Library > Manage Library > 

LiquidCrystal_I2C lcd(0x27,2,1,0,4,5,6,7); 
//0x27 is i2c address, EN,RW ,RS ,D4,D5,D6,D7 

/* Set these to your desired credentials. */
const char *ssid     = "YOUR_WIFI_NETWORK_NAME";   
const char *password = "YOUR_WIFI_PASSWORD";

//Web/Server address to read/write from 
const char *host = "api.myquran.com";
const int httpsPort = 443;  //HTTPS= 443 and HTTP = 80

//SHA1 finger print of certificate use web browser to view and copy
const char fingerprint[] PROGMEM = "95:3F:1A:FF:CB:5F:DA:AE:D0:B7:C8:C6:EF:80:81:8D:08:7D:05:24";

const long utcOffsetInSeconds = 3600;

String daysOfTheWeek[7] = {"Ahad  ", "Senin ", "Selasa", "Rabu  ", "Kamis ", "Jumat ", "Sabtu "};
String months[12]={"Jan", "Feb", "Mar", "Apr", "Mei", "Jun", "Jul", "Agu", "Sep", "Okt", "Nov", "Des"};

String strMMDD = "NA";
String strMMDDLast = strMMDD;
String strYY;

char jamsolat[5];
String SubuhTime, DzuhurTime, AsharTime, MaghribTime, IsyaTime;

// Define NTP Client to get time
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "id.pool.ntp.org", utcOffsetInSeconds);

void setup() {
  Serial.begin(115200);
  WiFi.mode(WIFI_OFF);        //Prevents reconnection issue (taking too long to connect)
  delay(1000);
  WiFi.mode(WIFI_STA);        //Only Station No AP, This line hides the viewing of ESP as wifi hotspot
  
  WiFi.begin(ssid, password);     //Connect to your WiFi router
  Serial.println("");

  Serial.print("Connecting");
  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  //If connection successful show IP address in serial monitor
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());  //IP address assigned to your ESP

  timeClient.begin();
  timeClient.setTimeOffset(25200);

  lcd.begin(20,4);   // initializing the LCD 16 x 2
  lcd.setBacklightPin(3,POSITIVE); // Enable or Turn On the backlight 
  lcd.setBacklight(LOW);

  lcd.home();
  lcd.print("Assalamu'alaikum"); // Start Print text to Line 1
  lcd.setCursor(0, 1);      
  lcd.print("--------------------"); // Start Print Test to Line 2

  delay(1000);
}

void loop() {
  timeClient.update();

  strMMDD = String(timeClient.getMonth())+"/"+String(timeClient.getDate());

  if (strMMDDLast != strMMDD) {
    lcd.clear();
    
    strMMDDLast = strMMDD;
    strYY = String(timeClient.getYear());

    Serial.print("Str M/D last = ");
    Serial.println(strMMDDLast);

    getSholatTime();
  } else {
    lcd.setCursor(0, 0);
    lcd.print(daysOfTheWeek[timeClient.getDay()]);

    if (int(timeClient.getDate()) > 9) {
      lcd.setCursor(7, 0);
      lcd.print(timeClient.getDate());
    } else {
      lcd.setCursor(7, 0);
      lcd.print("0");
      lcd.setCursor(8, 0);
      lcd.print(timeClient.getDate());
    }
  
    lcd.setCursor(10, 0);
    lcd.print(months[int(timeClient.getMonth()) - 1]);
    
    if (int(timeClient.getHours()) > 9) {
      lcd.setCursor(15, 0);
      lcd.print(timeClient.getHours());
    } else {
      lcd.setCursor(15, 0);
      lcd.print("0");
      lcd.setCursor(16, 0);
      lcd.print(timeClient.getHours());
    }
    
    lcd.setCursor(17, 0);
    lcd.print(":");
  
    if (int(timeClient.getMinutes()) > 9) {
      lcd.setCursor(18, 0);
      lcd.print(timeClient.getMinutes());
    } else {
      lcd.setCursor(18, 0);
      lcd.print("0");
      lcd.setCursor(19, 0);
      lcd.print(timeClient.getMinutes());
    }

    delay(1000);
  }
}

void getSholatTime() {
  WiFiClientSecure httpsClient;    //Declare object of class WiFiClient

  Serial.println(host);
  Serial.printf("Using fingerprint '%s'\n", fingerprint);
  httpsClient.setFingerprint(fingerprint);
  httpsClient.setTimeout(15000); // 15 Seconds
  delay(1000);
  
  Serial.print("HTTPS Connecting");
  int r=0; //retry counter
  while((!httpsClient.connect(host, httpsPort)) && (r < 30)){
      delay(100);
      Serial.print(".");
      r++;
  }
  if(r==30) {
    Serial.println(". Connection failed");
  }
  else {
    Serial.println(". Connected to web");
  }
  
  String Link;
  //GET Data
  Link = "/v1/sholat/jadwal/1204/20"+strYY+"/"+strMMDD; //address from which we need to get the data inside the server.

  Serial.print("requesting URL: ");
  Serial.println(host+Link);

  httpsClient.print(String("GET ") + Link + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" +             
               "Connection: close\r\n\r\n");

  Serial.println("request sent");
                  
  while (httpsClient.connected()) {
    String line = httpsClient.readStringUntil('\n');
    if (line == "\r") {
      Serial.println("headers received");
      break;
    }
  }

  Serial.println("reply was:");
  Serial.println("==========");
  String line;
  while(httpsClient.available()){        
    line = httpsClient.readStringUntil('\n');  //Read Line by Line

    // Get Subuh time ///////////////////
    int pos1 = line.indexOf("\"subuh\"");
    if (pos1 >= 0) {
      int j = 0;
      for(j=0; j<5; j++){
        jamsolat[j] = line[pos1 + 9 + j];
      }
      SubuhTime = jamsolat;
    }
    //////////////////////////////////////

    // Get Dzuhur time ///////////////////
    int pos2 = line.indexOf("\"dzuhur\"");
    if (pos2 >= 0) {
      int k = 0;
      for(k=0; k<6; k++){
        jamsolat[k] = line[pos2 + 10 + k];
      }
      DzuhurTime = jamsolat;
    }
    //////////////////////////////////////

    // Get Ashar time ////////////////////
    int pos3 = line.indexOf("\"ashar\"");
    if (pos3 >= 0) {
      int l = 0;
      for(l=0; l<5; l++){
        jamsolat[l] = line[pos3 + 9 + l];
      }
      AsharTime = jamsolat;
    }
    //////////////////////////////////////

    // Get Maghrib time //////////////////
    int pos4 = line.indexOf("\"maghrib\"");
    if (pos4 >= 0) {
      int m = 0;
      for(m=0; m<7; m++){
        jamsolat[m] = line[pos4 + 11 + m];
      }
      MaghribTime = jamsolat;
    }
    //////////////////////////////////////

    // Get Isya time ////////////////////
    int pos5 = line.indexOf("\"isya\"");
    if (pos5 >= 0) {
      int n = 0;
      for(n=0; n<5; n++){
        jamsolat[n] = line[pos5 + 8 + n];
      }
      IsyaTime = jamsolat;
    }
    //////////////////////////////////////

    SubuhTime = SubuhTime.substring(0,5);
    DzuhurTime = DzuhurTime.substring(0,5);
    AsharTime = AsharTime.substring(0,5);
    MaghribTime = MaghribTime.substring(0,5);
    IsyaTime = IsyaTime.substring(0,5);

    Serial.println("Subuh   : "+SubuhTime);
    Serial.println("Dzuhur  : "+DzuhurTime);
    Serial.println("Ashar   : "+AsharTime);
    Serial.println("Maghrib : "+MaghribTime);
    Serial.println("Isya    : "+IsyaTime);
    Serial.println("----- ### -----");
  }
  Serial.println("==========");
  Serial.println("closing connection");

  lcd.setCursor(0, 1);
  lcd.print("Dzuhur : ");
  lcd.setCursor(9, 1);
  lcd.print(DzuhurTime);

  lcd.setCursor(0, 2);
  lcd.print("Ashar  : ");
  lcd.setCursor(9, 2);
  lcd.print(AsharTime);

  lcd.setCursor(0, 3);
  lcd.print("Maghrib: ");
  lcd.setCursor(9, 3);
  lcd.print(MaghribTime);

  delay(1000);
}