#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include <WiFi.h>
#include <ThingSpeak.h>
#include <ESP32Servo.h>

#define WIFI_SSID "Wokwi-GUEST"
#define WIFI_PASSWORD ""
#define THINGSPEAK_API_KEY "SX9MOXHZLJASIDHW"
#define THINGSPEAK_CHANNEL_ID 2391807
#define RED_LED_PIN 27   // GPIO pin for the red LED
#define GREEN_LED_PIN 13 // GPIO pin for the green LED
#define SERVO_PIN 26     // GPIO pin for the servo
#define BUTTON_PIN 2     // GPIO pin for the push button

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);
DHT dht(14, DHT22);
Servo myservo;

const long updateInterval = 1 * 1000;
unsigned long lastUpdate = 0;
bool servoManualControl = false; // Flag for manual control via the push button

WiFiClient client;

void setup() {
  Serial.begin(115200);

  LCD.init();
  delay(1000);
  LCD.backlight();
  LCD.setCursor(0, 0);
  LCD.print("Initializing...");

  pinMode(RED_LED_PIN, OUTPUT);
  pinMode(GREEN_LED_PIN, OUTPUT);
  myservo.attach(SERVO_PIN); // Attach servo to the specified pin
  pinMode(BUTTON_PIN, INPUT_PULLUP); // Configure push button pin with pull-up resistor

  dht.begin();

  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

  ThingSpeak.begin(client);
}

void loop() {
  unsigned long currentMillis = millis();

  if (currentMillis - lastUpdate >= updateInterval) {
    float humidity = dht.readHumidity();
    float temperature = dht.readTemperature();

    if (isnan(humidity) || isnan(temperature)) {
      delay(2000);
      return;
    }

    LCD.clear();
    LCD.setCursor(0, 0);
    LCD.print("NEM DEGERI=");
    LCD.setCursor(11, 0);
    LCD.print(humidity);
    LCD.setCursor(16, 0);
    LCD.print("C");

    if (!servoManualControl) {
      // Automatically control the servo based on humidity level
      if (humidity < 30.0) {
        myservo.write(180); // Open the servo
        digitalWrite(RED_LED_PIN, HIGH);   // Red LED on
        digitalWrite(GREEN_LED_PIN, LOW);  // Green LED off
        LCD.setCursor(0, 1);
        LCD.print("DURUM= SU ACIK");
      } else {
        myservo.write(90); // Close the servo
        digitalWrite(RED_LED_PIN, LOW);    // Red LED off
        digitalWrite(GREEN_LED_PIN, HIGH); // Green LED on
        LCD.setCursor(0, 1);
        LCD.print("DURUM= SU KAPALI");
      }
    } else {
      // Manual control via the push button
      if (digitalRead(BUTTON_PIN) == LOW) {
        myservo.write(180); // Open the servo
        digitalWrite(RED_LED_PIN, HIGH);   // Red LED on
        digitalWrite(GREEN_LED_PIN, LOW);  // Green LED off
        LCD.setCursor(0, 1);
        LCD.print("DURUM= SU ACIK (MANUAL)");
      } else {
        myservo.write(90); // Close the servo
        digitalWrite(RED_LED_PIN, LOW);    // Red LED off
        digitalWrite(GREEN_LED_PIN, HIGH); // Green LED on
        LCD.setCursor(0, 1);
        LCD.print("DURUM= SU KAPALI (MANUAL)");
      }
    }

    ThingSpeak.writeField(THINGSPEAK_CHANNEL_ID, 1, temperature, THINGSPEAK_API_KEY);
    ThingSpeak.writeField(THINGSPEAK_CHANNEL_ID, 2, humidity, THINGSPEAK_API_KEY);

    lastUpdate = currentMillis;
  }
}