#include <WiFi.h>
#include <time.h>

// WiFi credentials
const char* ssid = "YOUR_SSID";
const char* password = "YOUR_PASSWORD";

// NTP server and timezone
const char* ntpServer = "pool.ntp.org";
const long gmtOffset_sec = 0; // Adjust for your timezone
const int daylightOffset_sec = 0;

// Parse a time string "YYYY-MM-DD HH:MM:SS" into struct tm
struct tm parseTime(const char *timeStr) {
    struct tm t = {0};
    sscanf(timeStr, "%d-%d-%d %d:%d:%d", &t.tm_year, &t.tm_mon, &t.tm_mday, &t.tm_hour, &t.tm_min, &t.tm_sec);
    t.tm_year -= 1900; // Adjust year
    t.tm_mon -= 1;     // Adjust month
    return t;
}

// Calculate duration between NTP time and a past time
void calculateDurationFromNTP(const char *pastTimeStr) {
    struct tm pastTm = parseTime(pastTimeStr); // Parse past time
    time_t past = mktime(&pastTm);

    if (past == -1) {
        Serial.println("Error: Invalid past time.");
        return;
    }

    // Get current time from NTP
    struct tm currentTm;
    if (!getLocalTime(&currentTm)) {
        Serial.println("Error: Failed to obtain current time.");
        return;
    }

    time_t current = mktime(&currentTm);
Serial.println(current);
    int seconds = difftime(current, past);
    Serial.printf("Duration: %d days, %d hours, %d minutes, %d seconds\n", 
                  seconds / 86400, (seconds % 86400) / 3600, (seconds % 3600) / 60, seconds % 60);
}

void setup() {
    Serial.begin(115200);
      WiFi.begin("Wokwi-GUEST", "", 6);
    Serial.print("Connecting to WiFi");
    while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.print(".");
    }
    Serial.println("\nConnected to WiFi");

    // Initialize NTP
    configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);

    // Example usage with NTP
    calculateDurationFromNTP("2024-12-25 11:13:46"); // Past time
    //"%Y-%m-%d %H:%M:%S"

}

void loop() {
    // Your code here
}