#include <Servo.h>
Servo windowServo;

bool systemEnabled = false;
bool manualACOverride = false; 
bool acState = false;    

void setup() {
    Serial.begin(9600);
    
    pinMode(A4, INPUT);
    pinMode(2, OUTPUT);
    pinMode(A1, INPUT_PULLUP); 
    pinMode(A2, INPUT_PULLUP);
    
    windowServo.attach(3);
    windowServo.write(0);
    digitalWrite(2, LOW);
}

void loop() {
    systemEnabled = (digitalRead(A1) == LOW);
    manualACOverride = (digitalRead(A2) == LOW); 
    float temperature = readTemperature();

    if (systemEnabled) {
        if (!acState) {
            if (temperature >= 33.0) windowServo.write(0);
            else if (temperature >= 30.0) windowServo.write(90);
            else if (temperature >= 27.0) windowServo.write(45);
            else if (temperature >= 22.0) windowServo.write(22);
            else windowServo.write(0);
        }

        if (!manualACOverride) {
            if (temperature >= 33.0 && !acState) {
                setAC(true, temperature);
                windowServo.write(0);
            } 
            else if (temperature < 33.0 && acState) {
                setAC(false, temperature);
            }
        }
        else if (acState) {
            setAC(false, temperature);
        }
    } 
    else {
        windowServo.write(0);
        if (acState) {
            setAC(false, temperature);
        }
    }

    delay(1000);
}

float readTemperature() {
    const float BETA = 3950;
    int analogValue = analogRead(A4);
    float temp = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
    Serial.print("Temperature: "); Serial.print(temp); Serial.println("°C");
    return temp;
}

void setAC(bool state, float temp) {
    digitalWrite(2, state ? HIGH : LOW);
    acState = state;
    Serial.print("AC "); Serial.print(state ? "ON" : "OFF");
    if (!state && manualACOverride) Serial.print(" (Relay)");
    Serial.print(", Temperature: "); Serial.print(temp); Serial.println("°C");
}