#include <TinyWireM.h>
#include "RTClib.h"

/* ---------- PIN DEFINITIONS ---------- */
#define RED_PIN  0   // PB0 (LED or Relay)

/* ---------- RED TIME SETTINGS ---------- */
// RED ON  at 18:30
#define RED_ON_HOUR   18
#define RED_ON_MIN    30

// RED OFF at 06:00
#define RED_OFF_HOUR  6
#define RED_OFF_MIN   0

RTC_DS3231 rtc;

/* ---------- SETUP ---------- */
void setup() {
  pinMode(RED_PIN, OUTPUT);
  digitalWrite(RED_PIN, LOW);   // RED OFF initially

  TinyWireM.begin();

  if (!rtc.begin()) {
    while (1);  // RTC error → fail safe
  }

  // ⚠️ RUN ONLY ONCE, THEN COMMENT
  // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
}

/* ---------- RED TIME CHECK ---------- */
bool isRedTime(int h, int m) {
  int nowMin = h * 60 + m;
  int onMin  = RED_ON_HOUR * 60 + RED_ON_MIN;
  int offMin = RED_OFF_HOUR * 60 + RED_OFF_MIN;

  // Overnight case (evening → morning)
  if (onMin > offMin) {
    return (nowMin >= onMin || nowMin < offMin);
  }
  // Same-day case
  return (nowMin >= onMin && nowMin < offMin);
}

/* ---------- LOOP ---------- */
void loop() {
  DateTime now = rtc.now();

  if (isRedTime(now.hour(), now.minute())) {
    digitalWrite(RED_PIN, HIGH);   // RED ON
  } else {
    digitalWrite(RED_PIN, LOW);    // RED OFF
  }

  delay(1000); // check every second
}