#include <TinyWireM.h>

#include <Tiny4kOLED.h>

// ============================================================================

const int dataPin = 1;   /* Q7 */
const int clockPin = 3;  /* CP */
const int latchPin = 4;  /* PL */

bool buttons[7];

int linx = 48;
const int buzz = 1;
int lastTime;
const int spd = 8;
int px = 64;
int py = 32;
int dx = 8;
int dy = 8;
int puntos = 0;

void line(int x, int y, int l, int t) {
  oled.setCursor(x, y); //Set position of line
  oled.startData();
  for (int n=0;n<=l;n++) {
    oled.sendData(t); //Maximum 256 combinations
  }
  oled.endData();
}

void buttonUpdate() {
  digitalWrite(latchPin, LOW);
  digitalWrite(latchPin, HIGH);

  // Step 2: Shift
  for (int i = 0; i < 7; i++) {
    if (digitalRead(dataPin)) {
      buttons[i] = 1;
    } else {
      buttons[i] = 0;
    }
    digitalWrite(clockPin, HIGH); // Shift out the next bit
    digitalWrite(clockPin, LOW);
  }
}

void setup() {
  oled.begin(128, 64, sizeof(tiny4koled_init_128x64r), tiny4koled_init_128x64r);
  pinMode(dataPin, INPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
  oled.setFont(FONT8X16);
}

void loop() {
  oled.clear();

  oled.setCursor(0,0);
  oled.println(String(puntos));

  oled.on();

  oled.setCursor(px, py/8); //Set position of pixel
  oled.startData();
  oled.sendData(0x03);
  oled.sendData(0x03);
  oled.endData();

  buttonUpdate();

  line(linx, 7, 16, 3);

  if (buttons[2]){
    linx -= spd;
    if (linx<-16) {
      linx=120;
    }
  }
  else if (buttons[1]){
    linx += spd;
    if (linx>127) {
      linx=0;
    }
  }

  if (px>=127) {
    dx *= -1;
  }

  if (px<=0) {
    dx *= -1;
  }

  if (py>=63) {
    px = 64;
    py = 32;
    puntos = 0;
    linx = 48;
    dx = random(8)-random(8);
  }
  
  if (py<=0) {
    dy *= -1;
  }

  if (py>=55 && py<63 && px>=linx && px<=linx+16) {
    dy *= -1;
    dx = random(8)-random(8);
    puntos++;
  }
  
  px+=dx;
  py+=dy;
  
  oled.on();
  delay(16);
}