#define ArrLen(x)         (sizeof(x)/sizeof(x[0]))

struct _homeScreen {
  char name[5];
  char content[16];
} homeScreen[7] = {
  {"date","-"},
  {"time","-"},
  {"sun", "-"},
  {"day", "-"},
  {"moon","-"},
  {"temp","-"},
  {"ip","-"},
};

const char msg[] = "ip";

int getIndex(const char* key) {
  for (int i=0; i<ArrLen(homeScreen); i++)
    if (strcmp(key, (const char*)homeScreen[i].name) == 0)
      return i;
  return -1;
}
// ---------------------------------------------------------

void setup() {
  Serial.begin(115200);


  unsigned int
  year = 2025,
  month = 8,
  day = 20,
  hour = 18,
  minute = 8,
  second = 52;

  unsigned int numbers[] = {
    year-2000,
    month,
    day,
    hour,
    minute,
    second
  };

  char dt_str[20];
  char buf[3];

  for (int i=0; i<ArrLen(numbers); i++) {
    sprintf(buf, "%02d", numbers[i]);
    strcat(dt_str, buf); 
    strcat(dt_str, ((i<5)?((i>2)?":":((i<2)?"-":" ")):""));
  }
  Serial.println(dt_str);
  
  /*
  Serial.println(BIN);
  char* str = msg;
  int n = getIndex(str);
  Serial.println(n);

  if (n < 0 || n >= ArrLen(homeScreen))
    Serial.println("INVALID");
  else 
    Serial.println(homeScreen[n].name);
  */
}

void loop() {
  delay(1);
}