#include <Wire.h>
#include <RTClib.h>
#include <TM1637Display.h>

#define CLK_PIN 9
#define DIO_PIN 8

TM1637Display display(CLK_PIN, DIO_PIN);
RTC_DS1307 rtc;

bool showTime = true;

#define UP_BUTTON_PIN 2
#define DOWN_BUTTON_PIN 3
#define MODE_BUTTON_PIN 4

unsigned long previousMillis = 0;
unsigned long previousMillisDate = 0; // Added for displaying date
const long interval = 10000;

int mode = 0;

void setup() {
    Wire.begin();
    rtc.begin();

    display.setBrightness(7);

    pinMode(UP_BUTTON_PIN, INPUT_PULLUP);
    pinMode(DOWN_BUTTON_PIN, INPUT_PULLUP);
    pinMode(MODE_BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
    DateTime now = rtc.now();
  

    if (mode == 0 || mode == 3) {
        bool isPM = now.hour() >= 12;
        int hour12 = now.hour() % 12;
        if (hour12 == 0) {
            hour12 = 12;
        }

        // Display hour and minute with blinking colon for seconds
        if (showTime) {
            display.showNumberDecEx(hour12 * 100 + now.minute(), 0b01110000, true); // Blinking colon enabled
        } else {
            display.showNumberDecEx(hour12 * 100 + now.minute(), 0b01110000, false); // Blinking colon disabled
        }
    } else if (mode == 1) {
        display.showNumberDecEx(now.month() * 100 + now.day(), 0b00001110, showTime);
    } else if (mode == 2) {
        display.showNumberDecEx(0, 0b01111001, false, 3, 1);
        display.showNumberDecEx(0, 0b01011110, false, 1, 0);
    }

    int buttonUpState = digitalRead(UP_BUTTON_PIN);
    int buttonDownState = digitalRead(DOWN_BUTTON_PIN);
    int buttonModeState = digitalRead(MODE_BUTTON_PIN);

    if (buttonUpState == LOW) {
        delay(50);
        if (buttonUpState == LOW) {
            if (mode == 3) {
                DateTime newTime = DateTime(now.year(), now.month(), now.day(), now.hour() + 1, now.minute(), now.second());
                rtc.adjust(newTime);
            } else if (mode == 1) {
                DateTime newDate = DateTime(now.year(), now.month(), now.day() + 1, now.hour(), now.minute(), now.second());
                rtc.adjust(newDate);
            } else {
                DateTime newTime = DateTime(now.year(), now.month(), now.day(), now.hour(), now.minute() + 1, now.second());
                rtc.adjust(newTime);
            }
        }
    }

    if (buttonDownState == LOW) {
        delay(50);
        if (buttonDownState == LOW) {
            if (mode == 3) {
                DateTime newTime = DateTime(now.year(), now.month(), now.day(), now.hour() - 1, now.minute(), now.second());
                rtc.adjust(newTime);
            } else if (mode == 1) {
                DateTime newDate = DateTime(now.year(), now.month(), now.day() - 1, now.hour(), now.minute(), now.second());
                rtc.adjust(newDate);
            } else {
                DateTime newTime = DateTime(now.year(), now.month(), now.day(), now.hour(), now.minute() - 1, now.second());
                rtc.adjust(newTime);
            }
        }
    }
    

    if (buttonModeState == LOW) {
        delay(50);
        if (buttonModeState == LOW) {
            mode++;
            if (mode > 3) {
                mode = 0;
            }
        }
    }

    if (mode == 2 && buttonModeState == LOW) {
        mode = 3;
    }

    unsigned long currentMillis = millis();
    if (currentMillis - previousMillis >= interval) {
        previousMillis = currentMillis;
        showTime = !showTime;
    }

    // Display date every 30 seconds
    if (currentMillis - previousMillisDate >= 30000) {
        display.showNumberDecEx(now.month() * 100 + now.day(), 0b00001110, showTime);
        previousMillisDate = currentMillis; // Update the previousMillis for date display
        delay(10000); // Display for 10 seconds
    }
}