#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>
#include <Wire.h>
#include <RTClib.h>
#include <OneWire.h>
#include <DallasTemperature.h>

// Pin definitions
#define TFT_CS    15
#define TFT_RST   4
#define TFT_DC    2
#define TFT_MOSI  23
#define TFT_CLK   18



#define BUTTON_PIN_1 5
#define BUTTON_PIN_2 32

#define ONE_WIRE_BUS 19

// Initialize display
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST, TFT_MOSI, TFT_CLK);

// Initialize DS1307 RTC
RTC_DS1307 rtc;

// Initialize DS18B20 temperature sensor
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

// Variables
bool page1Active = true; // Flag to indicate which page is active
unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers

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

  if (!rtc.isrunning()) {
    Serial.println("RTC is NOT running!");
  }

  tft.begin();
  tft.setRotation(3);  // Adjust rotation if needed

  //pinMode(TFT_BL, OUTPUT);
  //digitalWrite(TFT_BL, HIGH);  // Turn on the backlight

  // Set up buttons
  pinMode(BUTTON_PIN_1, INPUT);
  pinMode(BUTTON_PIN_2, INPUT);

  sensors.begin();
}

void loop() {
  // Check button presses
  int buttonState1 = digitalRead(BUTTON_PIN_1);
  int buttonState2 = digitalRead(BUTTON_PIN_2);

  if (buttonState1 == HIGH && buttonState2 == LOW) {
    page1Active = true;
  } else if (buttonState1 == LOW && buttonState2 == HIGH) {
    page1Active = false;
  }

  // Update the display based on the active page
  if (page1Active) {
    displayTime();
  } else {
    displayTemperature();
  }
}

void displayTime() {
  DateTime now = rtc.now();
  
  tft.fillScreen(ILI9341_BLACK);
  tft.setCursor(50, 100);
  tft.setTextColor(ILI9341_WHITE);
  tft.setTextSize(2);
  tft.print(now.hour());
  tft.print(':');
  if (now.minute() < 10) {
    tft.print('0');
  }
  tft.print(now.minute());
}

void displayTemperature() {
  sensors.requestTemperatures(); 

  float tempC = sensors.getTempCByIndex(0);
  if (tempC == -127.00) {
    tft.setCursor(50, 100);
    tft.setTextColor(ILI9341_WHITE);
    tft.setTextSize(2);
    tft.print("Error");
  } else {
    float tempF = sensors.toFahrenheit(tempC);
    // Draw temperature bar graph
    int barHeight = map(tempC, 0, 40, 0, 160);
    tft.fillRect(60, 180 - barHeight, 20, barHeight, ILI9341_RED);
  }
}