#define POT_PIN A0
#define BUTTON1 2
#define BUTTON2 3
#define LED1 4
#define LED2 5
#define LED3 6

int mode = 0; // 0: None, 1: Function 1, 2: Function 2
unsigned long lastDebounceTime1 = 0;
unsigned long lastDebounceTime2 = 0;
const unsigned long debounceDelay = 50;

void setup() {
    pinMode(POT_PIN, INPUT);
    pinMode(BUTTON1, INPUT_PULLUP);
    pinMode(BUTTON2, INPUT_PULLUP);
    pinMode(LED1, OUTPUT);
    pinMode(LED2, OUTPUT);
    pinMode(LED3, OUTPUT);
}

void loop() {
    unsigned long currentMillis = millis();
    
    if (digitalRead(BUTTON1) == LOW && (currentMillis - lastDebounceTime1 > debounceDelay)) {
        mode = 0; 
        mode = 1;
        lastDebounceTime1 = currentMillis;
    }
    if (digitalRead(BUTTON2) == LOW && (currentMillis - lastDebounceTime2 > debounceDelay)) {
        mode = 0; 
        mode = 2;
        lastDebounceTime2 = currentMillis;
    }

    if (mode == 1) {
        function1();
    } else if (mode == 2) {
        function2();
    } else {
        digitalWrite(LED1, LOW);
        digitalWrite(LED2, LOW);
        digitalWrite(LED3, LOW);
    }
}

void function1() {
    int potValue = analogRead(POT_PIN);
    static unsigned long lastBlinkTime = 0;
    static int ledIndex = 0;
    unsigned long currentMillis = millis();

    if (potValue < 100) {
        digitalWrite(LED1, LOW);
        digitalWrite(LED2, LOW);
        digitalWrite(LED3, LOW);
    } else {
        int numLEDs = (potValue < 340) ? 1 : (potValue < 680) ? 2 : 3;
        
        if (currentMillis - lastBlinkTime >= 1000) {
            lastBlinkTime = currentMillis;
            digitalWrite(LED1, LOW);
            digitalWrite(LED2, LOW);
            digitalWrite(LED3, LOW);
            
            if (ledIndex < numLEDs) {
                digitalWrite(LED1 + ledIndex, HIGH);
            }
            ledIndex = (ledIndex + 1) % numLEDs;
        }
    }
}

void function2() {
    int potValue = analogRead(POT_PIN);
    int level = map(potValue, 0, 1023, 0, 7);
    digitalWrite(LED1, bitRead(level, 0));
    digitalWrite(LED2, bitRead(level, 1));
    digitalWrite(LED3, bitRead(level, 2));
}