#include <RTClib.h>
#include <TimeLib.h>
#include <Wire.h>
// --- RTC and Time Zone Definitions ---
RTC_DS3231 rtc;
//RTC_DS1307 rtc;

const uint8_t TZ_COLUMNS = 4;
// Time Zone definitions (Name, POSIX String, Standard Name, DST Name)
const char *const TZ_DATA[][TZ_COLUMNS] = {
  { "Europe",   "CET-1CEST,M3.5.0/2:00:00,M10.5.0/2:00:00", "CET", "CEST" }, // Central European Time
  { "UTC",      "GMT0", "UTC", "UTC" },                                      // UTC
  // Add other time zones here if needed for TZrows calculation
};
const uint8_t TZ_ROWS = sizeof(TZ_DATA) / sizeof(TZ_DATA[0]);
// Global variables for time
uint8_t TZ_SELECT = 0; // Default Time Zone: Europe
struct tm ltz;         // Local Time structure (filled by localtime_r)
time_t UTCsec;         // Universal Time Coordinated (Epoch seconds)
time_t prevTime = 0;   // For time tick debouncing
// --- CORE FUNCTIONS ---
// Function to update global UTCsec and TimeLib from RTC
void updateClock() {
  // Get epoch time from RTC (ASSUMED TO BE UTC)
  UTCsec = rtc.now().unixtime();
  // Set TimeLib system clock to UTC time for internal consistency
  setTime(UTCsec);
}
// Function to convert UTCsec to Local Time (LT) and print results
void GetLocalTimeStr() {
  // CRITICAL STEP: Convert UTC (UTCsec) to Local Time (ltz)
  // localtime_r uses the global 'TZ' environment variable set in setup()
  localtime_r(&UTCsec, &ltz);
  // --- DIAGNOSTICS FOR WOKWI ---
  // 1. RAW RTC READ (Expected: UTC)
  DateTime now_rtc = rtc.now();
  Serial.printf("DEBUG: Raw RTC Time (Expected UTC): %04d-%02d-%02d %02d:%02d:%02d\n", now_rtc.year(), now_rtc.month(), now_rtc.day(), now_rtc.hour(), now_rtc.minute(), now_rtc.second());
  // 2. CONVERTED LOCAL TIME (Expected: LT = UTC + Offset)
  Serial.printf("DEBUG: LT Converted (ltz): %04d-%02d-%02d %02d:%02d:%02d (%s)\n", ltz.tm_year + 1900, ltz.tm_mon + 1, ltz.tm_mday, ltz.tm_hour, ltz.tm_min, ltz.tm_sec, ltz.tm_isdst ? TZ_DATA[TZ_SELECT][3] : TZ_DATA[TZ_SELECT][2]);
  // 3. UTCsec value
  Serial.printf("DEBUG: UTC Epoch: %lu\n\n", UTCsec);
}
// --- SETUP ---
void setup () {
  Serial.begin(115200);
  Wire.begin();
  if (!rtc.begin()) {
    Serial.println("Error: Cannot find RTC DS3231!");
    while (1) {
      delay(100);
    }
  }
  // >>> NOWA SEKCJA TYMCZASOWA DLA WOKWI <<<
  DateTime now_check = rtc.now();
  rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  // >>> KONIEC SEKCJI HACKUJĄCEJ WOKWI <<<
  // 1. INITIAL TIME SYNC: Read RTC -> UTCsec -> set TimeLib system clock
  // This uses the time set via Wokwi's 'initTime' attribute.
  updateClock();
  // 2. SET POSIX TIMEZONE RULES (Only set Local Time Zone)
  // We set the TZ rules for Central Europe (CET-1CEST)
  setenv("TZ", TZ_DATA[TZ_SELECT][1], 1);
  tzset();
  // Wait a moment for TZ rules to stabilize in the ESP32 OS
  delay(100);
  // 3. Initial calculation of Local Time strings
  GetLocalTimeStr();
}
// --- LOOP ---
void loop () {
  // 1. UPDATE BASE TIME (UTC) from RTC every cycle
  updateClock();
  // 2. Update Local Time and Display Strings only on a second tick
  if (second(now()) != second(prevTime)) {
    GetLocalTimeStr(); // Convert UTCsec to LT and print results
    prevTime = now(); // Update the previous time variable
  }
  delay(100);
}
//"attrs": { "initTime": "1970-01-01T00:00:00Z" }