const fs = require("fs");

exports.readInput = function (filename = "input") {
  const input = fs.readFileSync(filename, "utf-8").trim();
  const lines = input.split("\n");

  let colLength = lines[0].length;
  let colConsistentcy = true;
  for (const line of lines) {
    if (colLength != line.length) {
      colConsistentcy = false;
    }
  }

  const avgLength = sum(lines.map((l) => l.length)) / lines.length;

  console.log("Number of lines:", lines.length);
  console.log("Col-length is consistent:", colConsistentcy);
  console.log("Average col-length", avgLength);

  console.log("Sample:");
  for (const line of lines.slice(0, 5)) {
    console.log(line);
  }
  console.log("...");
  for (const line of lines.slice(lines.length - 5, lines.length)) {
    console.log(line);
  }
  console.log("=".repeat(process.stdout.columns));

  return {
    raw: input,
    lines: lines,
  };
};

const sum = (arr) => arr.reduce((a, b) => a + b, 0);