#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include "DHTesp.h"
#include <WiFi.h>
#include "ThingSpeak.h"

#define DHTPIN 2  // Chân kết nối với cảm biến DHT22
#define DHTTYPE DHT22  // Loại cảm biến DHT

DHT dht(DHTPIN, DHTTYPE);

// Địa chỉ I2C của màn hình LCD
LiquidCrystal_I2C lcd(0x27, 16, 2);

const int buttonPin = 25; // ESP32 connected to button's pin
const int LEDPin = 26; // ESP32 pin connected to LED's pin
const int relay = 5; // Pin for the relay

// WiFi credentials
const char* name = "Wokwi-GUEST"; // Thay bằng tên WiFi của bạn
const char* password = ""; // Thay bằng mật khẩu WiFi của bạn

// ThingSpeak details
unsigned long myChannelNumber = 2599113; // Thay bằng Channel ID của bạn
const char* myApiKey = "2V6XAV3CW95WEDJC"; // Thay bằng API key của bạn

WiFiClient client;
DHTesp dhtSensor;

// variables will change:
int ledState = LOW; // the current state of LED
int lastButtonState; // the previous state of button
int currentButtonState; // the current state of button

void setup() {
  Serial.begin(115200); // Choose your desired baud rate

  lcd.init();
  lcd.clear();
  lcd.backlight();
  dht.begin();

  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(LEDPin, OUTPUT);
  pinMode(relay, OUTPUT);
  currentButtonState = digitalRead(buttonPin);

  // Connect to WiFi
  WiFi.begin(name, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("WiFi not connected");
  }
  Serial.println("WiFi connected!");
  Serial.println("Local IP: " + String(WiFi.localIP()));

  // Initialize ThingSpeak library
  WiFi.mode(WIFI_STA); // Set WiFi mode to station (client)
  ThingSpeak.begin(client);
}

void loop() {
  // Read temperature and humidity
  TempAndHumidity data = dhtSensor.getTempAndHumidity();

  // Control relay based on temperature threshold
  if (data.temperature > 50) {
    digitalWrite(relay, LOW);
  } else {
    digitalWrite(relay, HIGH);
  }

  // Check if reading is valid
  if (isnan(data.humidity) || isnan(data.temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Set ThingSpeak fields
  ThingSpeak.setField(1, data.temperature);
  ThingSpeak.setField(2, data.humidity);

  // Control LED based on thresholds
  if (data.temperature > 35 || data.temperature < 12 || data.humidity > 70 || data.humidity < 40) {
    digitalWrite(LEDPin, HIGH);
  } else {
    digitalWrite(LEDPin, LOW);
  }

  // Send data to ThingSpeak
  int x = ThingSpeak.writeFields(myChannelNumber, myApiKey);

  // Print readings and success/error messages to serial monitor
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  if (x == 200) {
    Serial.println("Data pushed successfully");
  } else {
    Serial.println("Push error: " + String(x));
  }
  Serial.println("---");

  // Display readings on LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(data.temperature);
  lcd.print(" C");

  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(data.humidity);
  lcd.print(" %");

  // Delay for some time (adjust as needed)
  delay(5000); // Example: Delay for 5 seconds

  // Read button state and toggle LED
  lastButtonState = currentButtonState; // save the last state
  currentButtonState = digitalRead(buttonPin); // read new state
  if (lastButtonState == HIGH && currentButtonState == LOW) {
    Serial.println("The button is pressed");
    // toggle state of LED
    ledState = !ledState;
    // control LED according to the toggled state
    digitalWrite(LEDPin, ledState);
  }
}