#include <SPI.h>
#include <stdint.h>
#include <TFTv2.h>
#include <Wire.h>
#include <RTClib.h>

RTC_DS1307 rtc;

#define TIME_X 5
#define TIME_Y 70
#define TIME_SIZE 10

void setup() {
    TFT_BL_ON;
    Tft.TFTinit();
    Wire.begin();
    rtc.begin();
    
    // Uncomment to set RTC to compile time (do once, then comment out)
    // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    
    // Clear entire screen once
    Tft.fillScreen(0, 320, 0, 240, BLACK);
}

void loop() {
    static unsigned long lastUpdate = 0;
    static char lastTime[16] = "";
    
    if (millis() - lastUpdate >= 1000) {
        lastUpdate = millis();
        
        DateTime now = rtc.now();
        
        // Convert to 12-hour format
        int hour12 = now.hour();
        if (hour12 == 0) {
            hour12 = 12;  // Midnight is 12 AM
        } else if (hour12 > 12) {
            hour12 -= 12;  // Convert PM hours
        }
        
        char timebuf[16];
        sprintf(timebuf, "%02d:%02d", hour12, now.minute());
        
        // Update time if changed
        if (strcmp(timebuf, lastTime) != 0) {
            // Erase old time by drawing in BLACK
            Tft.drawString(lastTime, TIME_X, TIME_Y, TIME_SIZE, BLACK, LANDSCAPE);
            
            // Draw new time in WHITE
            Tft.drawString(timebuf, TIME_X, TIME_Y, TIME_SIZE, WHITE, LANDSCAPE);
            
            strcpy(lastTime, timebuf);
        }
    }
}