#include <FastLED.h>

#define LED_PIN 6
#define WIDTH 16
#define HEIGHT 16
#define NUM_LEDS (WIDTH * HEIGHT)
CRGB leds[NUM_LEDS];

// https://pastebin.com/r7e28UuM
int index(int x, int y) {
  if (y % 2 == 0)
    return y * WIDTH + WIDTH - x - 1;
  else
    return y * WIDTH + x;
}

float bail_x = 0;
float bail_y = 0;

float bail_vx = 0;
float bail_vy = 0;

int player_1 = 0;
int player_2 = 0;

int MAX_BR = 255;
int X_pos = 1;
int X_pos_2 = WIDTH - 2;
int palca = 3;

#define rezistor_1 A0
#define rezistor_2 A1

void setup() {
  Serial.begin(115200);
  FastLED.addLeds<NEOPIXEL, LED_PIN>(leds, NUM_LEDS);
  FastLED.setBrightness(50);
  pinMode(rezistor_1, INPUT);
  pinMode(rezistor_2, INPUT);
  bail_x = WIDTH / 2;
  bail_y = HEIGHT / 2;
  bail_vx = 0.01;
  bail_vy = 0.05;
}

void loop() {
  player_1 = map(analogRead(rezistor_1), 0, 1023, 0, HEIGHT - palca + 1);
  player_2 = map(analogRead(rezistor_2), 0, 1023, 0, HEIGHT - palca + 1);
  float bail_x_new = bail_x + bail_vx;
  float bail_y_new = bail_y + bail_vy;
  if (bail_y_new < 0 || bail_y_new >= HEIGHT) {
    bail_vy = -bail_vy;
    bail_y_new = bail_y + bail_vy;
  }

  bail_x = bail_x_new;
  bail_y = bail_y_new;

  for (int i = 0; i < palca; i++) {
    leds[index(X_pos, i + player_1)].setRGB(0, 0, MAX_BR);
    leds[index(X_pos_2, i + player_2)].setRGB(MAX_BR, 0, 0);
  }

  leds[index(bail_x, bail_y)].setRGB(MAX_BR, MAX_BR, MAX_BR);
  FastLED.show();

  for (int i = 0; i < palca; i++) {
    leds[index(X_pos, i + player_1)].setRGB(0, 0, 0);
    leds[index(X_pos_2, i + player_2)].setRGB(0, 0, 0);
  }


  leds[index(bail_x, bail_y)].setRGB(0, 0, 0);
}