const { POINTER_TO_START_OF_DISPLAY_MEM } = require('./machine.config');
const { num2hex } = require('./logging.js');

/**
 * Print the contents of display memory as hex number
 * @param {Uint8Array} mem - CPU memory
 **/
const printDisplay = (mem) => {
  const disp = mem[POINTER_TO_START_OF_DISPLAY_MEM];
  for (let i = disp; i < disp + 16; i += 4) {
    console.log(`${num2hex(mem[i])} ${num2hex(mem[i+1])} ${num2hex(mem[i+2])} ${num2hex(mem[i+3])}`);
  }
}

/**
 * Print the contents of display memory using black and white emoji circles
 * @param {Uint8Array} mem - CPU memory
 **/
const prettyPrintDisplay = (mem) => {
  const disp = mem[POINTER_TO_START_OF_DISPLAY_MEM];
  const num2pic = (n) => n > 0 ? '⚫' : '⚪';
  for (let i = disp; i < disp + 16; i += 4) {
    console.log(`${num2pic(mem[i])}${num2pic(mem[i+1])}${num2pic(mem[i+2])}${num2pic(mem[i+3])}`);
  }
}

module.exports = {
  "printDisplay": printDisplay,
  "prettyPrintDisplay": prettyPrintDisplay,
}