/**
   Simon Game for Arduino with Score display

   Copyright (C) 2022, Uri Shaked

   Released under the MIT License.
*/


/**
   Set up the Arduino board and initialize Serial communication
*/
int ledPins[] = {9, 10, 11, 12};   
int numLeds = 4;                   
int interval = 200;                // 切换 LED 的时间间隔
volatile bool buttonPressed = false; 
int direction = 1;                 // 1和-1转化
int currentLed = 0;                // 索引
unsigned long previousMillis = 0;  // 重置时间

void setup() {
  pinMode(2, INPUT_PULLUP);
  for (int i = 0; i < numLeds; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
  // 中断
  attachInterrupt(digitalPinToInterrupt(2), onButtonPress, FALLING);
}

void loop() {
  if (buttonPressed) {
    direction = -direction;   // 改变方向
    buttonPressed = false;    // 复位
  }

  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;  // 重置时间

    // 使当前LED熄灭，亮下一个
    digitalWrite(ledPins[currentLed], LOW);

    // 根据方向更新当前 LED 索引
    currentLed += direction;
    if (currentLed >= numLeds) {
      currentLed = 0;  //第一个LED
    } else if (currentLed < 0) {
      currentLed = numLeds - 1;  //第四个LED
    }//根据索引的方向来进行第一个和第四个LED的转化

    // 打开新的 LED
    digitalWrite(ledPins[currentLed], HIGH);
  }
}

// 中断
void onButtonPress() {
  buttonPressed = true; // 标记按键被按下
}

// int i =1;
// for(i =1; i<=10;i++){
//   for(int n =0;n<=3;n++){
//    digitalWrite(ledPins[n],HIGH);
//    delay(1000-i*100);
//    //digitalWrite(ledPins[n],LOW);
//   }
//   for(int n=3;n>=0;n--){
//    digitalWrite(ledPins[n],LOW);
//    delay(1000-i*100);
//   }
//  }