#include "U8glib.h"
#include <DHT.h>

// Pin Definitions
#define DHTPIN 12
#define FANPIN 13
#define DHTTYPE DHT22

// U8glib Display Object
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_DEV_0 | U8G_I2C_OPT_NO_ACK | U8G_I2C_OPT_FAST);

// DHT Sensor Object
DHT dht(DHTPIN, DHTTYPE);

// Humidity Threshold
const float humidityThreshold = 60.0;

bool fansOn = false;

void setup() {
  // Start Serial Communication for Debugging
  Serial.begin(9600);

  // Initialize DHT Sensor
  dht.begin();

  // Initialize Fan Pin
  pinMode(FANPIN, OUTPUT);
  digitalWrite(FANPIN, LOW);

  // Set Font for Display
  u8g.setFont(u8g_font_6x10); // Use a small, readable font
}

void loop() {
  // Read Humidity and Temperature from DHT Sensor
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Print sensor values to Serial Monitor for debugging
  Serial.print("Humidity: ");
  Serial.println(humidity);
  Serial.print("Temperature: ");
  Serial.println(temperature);

  // Handle NaN (Not a Number) Case
  if (isnan(humidity) || isnan(temperature)) {
    u8g.firstPage();
    do {
      u8g.drawStr(10, 30, "DHT Read Error");
    } while (u8g.nextPage());
    delay(2000); // Retry after 2 seconds
    return;
  }

  // Control Fan Based on Humidity
  if (humidity > humidityThreshold) {
    fansOn = true;
    digitalWrite(FANPIN, HIGH);
  } else {
    fansOn = false;
    digitalWrite(FANPIN, LOW);
  }

  // Render Display Content
  u8g.firstPage();
  do {
    // Clear the screen
    u8g.drawStr(10, 10, "Curing Chamber");

    // Directly Render Humidity
    char humidityText[16];
    dtostrf(humidity, 4, 1, humidityText); // Convert float to string
    u8g.drawStr(10, 25, "Humidity:");
    u8g.drawStr(80, 25, humidityText);
    u8g.drawStr(110, 25, "%");

    // Directly Render Temperature
    char tempText[16];
    dtostrf(temperature, 4, 1, tempText); // Convert float to string
    u8g.drawStr(10, 40, "Temp:");
    u8g.drawStr(80, 40, tempText);
    u8g.drawStr(110, 40, "C");

    // Fan Status Display
    u8g.drawStr(10, 55, "Fans:");
    u8g.drawStr(60, 55, fansOn ? "ON" : "OFF");
  } while (u8g.nextPage());

  // Delay to allow screen refresh
  delay(2000); // Update every 2 seconds
}