#include <Arduino.h>

// ---- OUTPUT: 3 LED ----
#define RED_LED   D1
#define GREEN_LED D7
#define BLUE_LED  D8

// ---- INPUT: 4 nút nhấn ----
#define BTN1 D0
#define BTN2 D3
#define BTN3 D4
#define BTN4 D5

volatile int count1 = 0;
volatile int count2 = 0;
volatile int count3 = 0;

void updateLEDs() {
    int maxCount = count1;
    if (count2 > maxCount) maxCount = count2;
    if (count3 > maxCount) maxCount = count3;

    digitalWrite(RED_LED,   (count1 == maxCount) ? HIGH : LOW);
    digitalWrite(GREEN_LED, (count2 == maxCount) ? HIGH : LOW);
    digitalWrite(BLUE_LED,  (count3 == maxCount) ? HIGH : LOW);
}

void isr_btn1() {
    count1++;
    updateLEDs();
}

void isr_btn2() {
    count2++;
    updateLEDs();
}

void isr_btn3() {
    count3++;
    updateLEDs();
}

void isr_btn4() {
    count1 = 0;
    count2 = 0;
    count3 = 0;
    updateLEDs();  // Gọi update để tắt hết LED
}

void setup() {
    pinMode(RED_LED,   OUTPUT);
    pinMode(GREEN_LED, OUTPUT);
    pinMode(BLUE_LED,  OUTPUT);

    digitalWrite(RED_LED,   LOW);
    digitalWrite(GREEN_LED, LOW);
    digitalWrite(BLUE_LED,  LOW);

    pinMode(BTN1, INPUT_PULLUP);
    pinMode(BTN2, INPUT_PULLUP);
    pinMode(BTN3, INPUT_PULLUP);
    pinMode(BTN4, INPUT_PULLUP);

    attachInterrupt(digitalPinToInterrupt(BTN1), isr_btn1, FALLING);
    attachInterrupt(digitalPinToInterrupt(BTN2), isr_btn2, FALLING);
    attachInterrupt(digitalPinToInterrupt(BTN3), isr_btn3, FALLING);
    attachInterrupt(digitalPinToInterrupt(BTN4), isr_btn4, FALLING);
}

void loop() {
    // Không làm gì
}