#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 32
#define OLED_RESET -1
#define SCREEN_ADDRESS 0x3C

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// WiFi credentials
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// Time API endpoint
const char* timeApiUrl = "http://worldtimeapi.org/api/timezone/Europe/Bucharest";

void setup() {
  Serial.begin(115200);
Wire.begin(13, 14);
  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Don't proceed, loop forever
  }

  display.display();
  delay(2000);
  display.clearDisplay();
}

void loop() {
  display.clearDisplay();

  // Fetch current time from the time API
  String currentTimeStr = getTimeFromApi();

  // Parse the JSON response
  const size_t capacity = JSON_OBJECT_SIZE(15) + 400;
  // JSON_OBJECT_SIZE(2) + 100;
  DynamicJsonDocument doc(capacity);
  deserializeJson(doc, currentTimeStr);

  // Extract time values
  String datetime = doc["datetime"];
  String zian = doc["day_of_year"];
  String week = doc["week_number"];
 // Serial.print(datetime);
  //Serial.println(timezone);
  // Adjust the time to the Karachi time zone (GMT+5)
 const char* karachiTimeZone = "Europe/Bucharest";
  
//    int hours = datetime.substring(11, 13).toInt();
//    int minutes = datetime.substring(14, 16).toInt();
//    int seconds = datetime.substring(17, 19).toInt();


    int hours, minutes, seconds;
parseTime(datetime, hours, minutes, seconds);
Serial.print("Hours: ");
Serial.println(hours);
Serial.print("Minutes: ");
Serial.println(minutes);
Serial.print("Seconds: ");
Serial.println(seconds);
Serial.print("Ziua din an: ");
Serial.println(zian);
Serial.print("Nr.sapt: ");
Serial.println(week);




    // Display hours and minutes with text size 3
    display.setTextSize(3);
    display.setTextColor(SSD1306_WHITE);
    display.setCursor(5, 10); // Adjust the position as needed
    if (hours < 10) {
      display.print("0"); // Add leading zero for single-digit hours
    }
    display.print(hours);
    display.print(":");
    if (minutes < 10) {
      display.print("0"); // Add leading zero for single-digit minutes
    }
    display.print(minutes);

    // Display seconds with text size 2
    display.setTextSize(2);
    display.setCursor(100, 15); // Adjust the position as needed
    if (seconds < 10) {
      display.print("0"); // Add leading zero for single-digit seconds
    }
    display.print(seconds);
  

  display.display();
  delay(10000); // Update the display every second
}

String getTimeFromApi() {
  WiFiClient client;

  // Make a GET request to the time API
  HTTPClient http;
  http.begin(client, timeApiUrl); // Use begin with WiFiClient
  //Serial.print('timeApiUrl');
  int httpCode = http.GET();
  if (httpCode > 0) {
    if (httpCode == HTTP_CODE_OK) {
      String payload = http.getString();
      //Serial.println(payload);
      http.end();
      return payload;
    }
  } else {
    Serial.println("Failed to connect to time API");
  }
  http.end();
  return "";
}



void parseTime(const String &timeStr, int &hours, int &minutes, int &seconds) {
  // Find the position of 'T' in the string
  int tIndex = timeStr.indexOf('T');
  
  if (tIndex != -1) {
    // Extract the time substring after 'T'
    String timeSubStr = timeStr.substring(tIndex + 1);
    
    // Find the position of '+' in the time substring
    int plusIndex = timeSubStr.indexOf('+');
    
    if (plusIndex != -1) {
      // Extract the time part before '+'
      String timePart = timeSubStr.substring(0, plusIndex);
      
      // Split the time part into hours, minutes, and seconds
      hours = timePart.substring(0, 2).toInt();
      minutes = timePart.substring(3, 5).toInt();
      seconds = timePart.substring(6, 8).toInt();
    }
  }
}