#define BLYNK_TEMPLATE_ID "TMPL6cX_xEUQs"
#define BLYNK_TEMPLATE_NAME "DHt"
#define BLYNK_AUTH_TOKEN "4HT-bgQWuznUZCWLC5HaKXKDwEsfIAua"
#include <Arduino.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>

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

#define BLYNK_PRINT Serial

#define RED_PIN 27
#define GREEN_PIN 26
#define BLUE_PIN 25

#define DHTPIN 14
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

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

const char *WIFI_SSID = "Wokwi-GUEST";
const char *WIFI_PASS = "";

BlynkTimer timer;

void sendDhtToBlynk()
{
  float hum = dht.readHumidity();
  float temp = dht.readTemperature();

  if (isnan(hum) || isnan(temp)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // ส่งค่าไป Blynk
  Blynk.virtualWrite(V1, temp);  // อุณหภูมิ
  Blynk.virtualWrite(V2, hum);   // ความชื้น

  // แสดงบน Serial monitor
  Serial.print("Temp: ");
  Serial.print(temp);
  Serial.print(" *C, Hum: ");
  Serial.print(hum);
  Serial.println(" %");

  // แสดงบน OLED
  display.clearDisplay();
  display.setTextSize(2);
  display.setCursor(0, 0);

  display.print("T: ");
  display.print((int)temp);
  display.print((char)247); // สัญลักษณ์องศา
  display.print("C");

  display.setCursor(0, 20);
  display.print("H: ");
  display.print((int)hum);
  display.print("%");

  display.display(); 
}

void setRGB(uint8_t r, uint8_t g, uint8_t b)
{
analogWrite(RED_PIN, r);
analogWrite(GREEN_PIN, g);
analogWrite(BLUE_PIN, b);
}

void setup() {
  Serial.begin(115200);
  
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);

  dht.begin();
  setRGB(0, 0, 0);

  // เชื่อม WiFi
  WiFi.begin(WIFI_SSID, WIFI_PASS);
  Serial.print("Connecting WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(300);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected!");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  // เชื่อม Blynk
  Blynk.begin(BLYNK_AUTH_TOKEN, WIFI_SSID, WIFI_PASS);

  // ตั้งค่า OLED
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("SSD1306 allocation failed");
    for (;;);
  }
  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);

  // เรียก sendDhtToBlynk()
  timer.setInterval(500L, sendDhtToBlynk);
}

void loop() {
  Blynk.run();
  timer.run();

  float hum = dht.readHumidity();
  float temp = dht.readTemperature();

   if (temp < 23){
    setRGB(0, 0, 255);
  }
  else if (temp >= 23 && temp <= 27)
  { 
  setRGB(0, 255, 0);
  }
  else {
  setRGB(255, 0, 0);
  }
}