let { num2hex } = require('./conversions.js');

/**
 * Display a table of memory locations.
 * Call with [start] and [end] indices to display a range.
 * @param {Uint8Array} mem - Memory to display
 * @param {number}  [start] - A start-index, in decimal
 * @param {number}  [end] - An end-index, in decimal
 **/
const logMemory = (mem, start=0, end=mem.length) => {
  let top1 = `┌─────────┬────────┬─────────┐`;
  let top2 = `│  addrs  │ opcode │ operand │`;
  let top3 = `├─────────┼────────┼─────────┤`;
  let blnk = `│         │        │         │`;
  let bot1 = `└─────────┴────────┴─────────┘`;
  console.log(`${top1}\n${top2}\n${top3}`);
  for (let i = start; i < mem.length; i +=2) {
    let operand = mem[i+1];
    if (typeof operand === 'undefined') {
      console.log(`│  ${num2hex(i)} ${num2hex(i+1)}  │   ${num2hex(mem[i])}   │         │`);
    } else {
      console.log(`│  ${num2hex(i)} ${num2hex(i+1)}  │   ${num2hex(mem[i])}   │   ${num2hex(operand)}    │`);
    }

    // Add a blank row every 4 lines:
    let rowNum = i - start + 2; // Not actually the row number...
    if ((rowNum % 8 === 0)
        && (i < (mem.length - 2))) {
      console.log(blnk);
    }
  }
  console.log(bot1);
}

const logRunningHeader = () => {
  console.log();
  let time = new Date();
  console.log( `┌─────────────────────┐`);
  console.log( `│ Running at ${time.toLocaleTimeString('en-GB')} │` );
  console.log( `└─────────────────────┘`);
}

module.exports = {
  "logMemory": logMemory,
  "logRunningHeader": logRunningHeader,
}