#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "DHT.h"

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

#define DHTPIN 8
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

#define LDR_PIN A0
#define R_FIXED 10000

// 8x8 pixel piktogrammalar bitmap shaklida
const unsigned char tempIcon [] PROGMEM = {
  0b00011000,
  0b00011000,
  0b00011000,
  0b00011000,
  0b00111100,
  0b01111110,
  0b01111110,
  0b00111100
};

const unsigned char humIcon [] PROGMEM = {
  0b00010000,
  0b00111000,
  0b01111100,
  0b11111110,
  0b11111110,
  0b01111100,
  0b00111000,
  0b00010000
};

const unsigned char lightIcon [] PROGMEM = {
  0b00100100,
  0b01001010,
  0b01001010,
  0b00100100,
  0b11111111,
  0b00100100,
  0b01001010,
  0b00000000
};

void setup() {
  Serial.begin(9600);
  dht.begin();

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("OLED topilmadi!");
    while(1);
  }

  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);

  // Piktogrammalarni bir martalik ekranga joylash
  display.drawBitmap(0,0, tempIcon, 8,8, SSD1306_WHITE);
  display.setCursor(12,0);
  display.print("Temp (C)");

  display.drawBitmap(0,20, humIcon, 8,8, SSD1306_WHITE);
  display.setCursor(12,20);
  display.print("Humidity (%)");

  display.drawBitmap(0,40, lightIcon, 8,8, SSD1306_WHITE);
  display.setCursor(12,40);
  display.print("Light (lx)");

  display.display();
}

float calculateLux(int adcValue) {
  float rLDR = R_FIXED * (1023.0 - adcValue) / adcValue;  
  float lux = 500.0 / pow(rLDR / 1000.0, 1.4);             
  return lux;
}

void loop() {
  int ldrADC = analogRead(LDR_PIN);
  float lux = calculateLux(ldrADC);
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();

  Serial.print("Temp: "); Serial.print(temp); Serial.print("C, ");
  Serial.print("Hum: "); Serial.print(hum); Serial.print("%, ");
  Serial.print("Light: "); Serial.print(lux); Serial.println(" lx");

  // OLED da qiymatlarni yangilash (piktogrammalar harakat qilmaydi)
  display.fillRect(80,0,48,8, SSD1306_BLACK);   // Temp joyi
  display.setCursor(80,0);
  display.print(temp,1);

  display.fillRect(80,20,48,8, SSD1306_BLACK);  // Hum joyi
  display.setCursor(80,20);
  display.print(hum,0);

  display.fillRect(80,40,48,8, SSD1306_BLACK);  // Light joyi
  display.setCursor(80,40);
  display.print(lux,1);

  display.display();
  delay(2000);
}