#include <LedControl.h>
#define VERT_PIN A0
#define HORZ_PIN A1
#define SEL_PIN  2

LedControl lc(11,12,10,4);

int place_pre[2] = {0,0};
int place_now[2] = {0,0};

int nutRAW = 0,nutCOL = 0;

void nut(){
  nutRAW = random(8);
  nutCOL = random(16);

  while (place_now[0] == nutRAW && place_now[1] == nutCOL)
  {
    nutRAW = random(8);
    nutCOL = random(16);
  }

  lc.setLed(nutCOL/8,nutRAW,nutCOL%8,1);
  lc.setLed(nutCOL/8+2,nutRAW,nutCOL%8,1);
}

void setup() {
  lc.shutdown(0,false);
  lc.setIntensity(0,0);
  lc.clearDisplay(0);

  pinMode(VERT_PIN, INPUT);
  pinMode(HORZ_PIN, INPUT);
  pinMode(SEL_PIN, INPUT_PULLUP); 

  randomSeed(analogRead(0));

  lc.setLed(0,place_now[0],place_now[1],1);
  lc.setLed(2,place_now[0],place_now[1],1);

  attachInterrupt(digitalPinToInterrupt(SEL_PIN), nut , FALLING);
}

void loop() {
  int vert = analogRead(VERT_PIN); //讀取A0的資訊 按下回傳0 按上回傳1023
  int horz = analogRead(HORZ_PIN); //讀取A1的資訊 按左回傳0 按右回傳1023
  bool selPressed = digitalRead(SEL_PIN) == LOW;

  if (vert > 700 && place_now[0] > 0) // 向上
    place_now[0]--;
  else if (vert < 300 && place_now[0] < 7) //向下
    place_now[0]++;

  if (horz > 700 && place_now[1] < 15) //向右
    place_now[1]++;
  else if (horz < 300 && place_now[1] > 0) //向左
    place_now[1]--;

  if (place_pre[0] != place_now[0] || place_pre[1] != place_now[1])
  {
    lc.setLed(place_pre[1]/8,place_pre[0],place_pre[1]%8,0);
    lc.setLed(place_pre[1]/8+2,place_pre[0],place_pre[1]%8,0);

   place_pre[0] = place_now[0];
   place_pre[1] = place_now[1];
  }

  lc.setLed(place_now[1]/8,place_now[0],place_now[1]%8,1);
  lc.setLed(place_now[1]/8+2,place_now[0],place_now[1]%8,1);
  
  delay(100);
}