#define LED 27
#define DHT_PIN 16
#define LIGHT 33
#define LED2 32
#define OUT 12


#include <WiFi.h>
#include "DHTesp.h"
#include <HTTPClient.h>
#include <LiquidCrystal_I2C.h>
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const char* FIREBASE_HOST ="https://labs-3-a068f-default-rtdb.firebaseio.com/";
const char* FIREBASE_AUTH="AIzaSyADTA630fNDS-rJEf5-aLy9CJaVQvjK8Bw";
const char* databaseURL="https://labs-3-a068f-default-rtdb.firebaseio.com/Sensor.json";
TempAndHumidity data;
TempAndHumidity lastData;
DHTesp dhtSensor;
LiquidCrystal_I2C lcd(0x27, 16, 2);
WiFiClient client;



int trangthai;
int pirState = LOW;


void DHTsensor();
void setup() {
Serial.begin(115200);
Wire.begin(14, 17);
dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
pinMode(LED, OUTPUT);
pinMode(LIGHT, INPUT);
pinMode(LED2, OUTPUT);
pinMode(OUT, INPUT);
WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
while (WiFi.status() != WL_CONNECTED){
delay(1000);
Serial.println("Wifi not connected");
}
Serial.println("Wifi connected !");
Serial.println("Local IP: " + String(WiFi.localIP()));
WiFi.mode(WIFI_STA);
lcd.init();
lcd.backlight();
lcd.setCursor(0, 0);
lcd.print("NGUYEN TIEN DAT");

}

void loop() {
  DHTsensor();
  blinkLED();
  if (data.temperature != lastData.temperature || data.humidity != lastData.humidity) {
    firebase();
    lastData = data;
  }

  if (digitalRead(OUT) == HIGH) {    
    lcd.setCursor(0, 1);
    lcd.print("CO NGUOI      ");
    if (pirState == LOW) {
      pirState = HIGH;
    }
  } else {
    lcd.setCursor(0, 1);
    lcd.print("KHONG CO NGUOI");
    if (pirState == HIGH) {
      pirState = LOW;
    }
  }
}


void DHTsensor() {
  static unsigned long previousTempMillis = 0;
  const long tempInterval = 2000;
  unsigned long currentMillis = millis();

  if (currentMillis - previousTempMillis >= tempInterval) {
    previousTempMillis = currentMillis;
    data = dhtSensor.getTempAndHumidity();
    Serial.println("Nhiệt độ: " + String(data.temperature, 2) + " °C");
    Serial.println("Độ ẩm: " + String(data.humidity, 1) + " %");
    Serial.println("--------------------------------------");
  }
}

void firebase(){
    String Sensor= String("{\"Độ ẩm\":") + String(data.humidity) + String(",\"Nhiệt độ\":") + String(data.temperature) + String("}");
    HTTPClient http;
    http.begin(databaseURL);
    http.addHeader("Content-Type", "application/json");
    http.addHeader("Authorization", FIREBASE_AUTH);
    int x = http.PUT(Sensor);
    if(x == 200){
      Serial.println("Dữ liệu được gửi thành công");
    }else{
      Serial.println("Gửi dữ liệu thất bại" + String(x));
    }
    Serial.println("--------------------------------------");
}


void blinkLED() {
  static boolean isLedBlinking = false;
  static unsigned long previousLedMillis = 0;
  const long ledInterval = 100;

  unsigned long currentMillis = millis();

  // Nhiệt độ > 50 độ C, bật chớp led
  TempAndHumidity data = dhtSensor.getTempAndHumidity();
  if (data.temperature > 50 && !isLedBlinking && data.temperature <80) {
    isLedBlinking = true;
    previousLedMillis = currentMillis;
    digitalWrite(LED, HIGH);
    digitalWrite(LED2, LOW);
  }
  // Nhiệt độ < 50 độ C, tắt chớp led
  else if (data.temperature <= 50) {
    isLedBlinking = false;
    digitalWrite(LED, LOW);
    digitalWrite(LED2, HIGH);
  }

  // Chớp tắt LED
  if (isLedBlinking && currentMillis - previousLedMillis >= ledInterval) {
    previousLedMillis = currentMillis;
    digitalWrite(LED, !digitalRead(LED));
  }
}