// Generated by CoffeeScript 2.7.0
var calculate, echo, f, factorial, generatePairings;

echo = console.log;

factorial = function(n) {
  if (n <= 1) {
    return 1;
  } else {
    return n * factorial(n - 1);
  }
};

f = function(players) {
  var denominator, n, numerator;
  n = players / 2;
  numerator = factorial(players);
  denominator = (2 ** n) * factorial(n);
  return numerator / denominator;
};

calculate = function() {
  var item, j, len, n, s, total;
  n = parseInt(document.getElementById("input").value);
  if (n % 2 !== 0) {
    document.getElementById("label").innerText = "Felaktigt antal spelare";
    return;
  }
  s = `${f(n)} parningar\n`;
  if (n === 2 || n === 4 || n === 6 || n === 8 || n === 10) {
    total = generatePairings("123456789abcdef".slice(0, n));
    for (j = 0, len = total.length; j < len; j++) {
      item = total[j];
      s += item.map(function(x) {
        return x.join("");
      }).join(" ") + "\n";
    }
  }
  return document.getElementById("label").innerText = s;
};

generatePairings = function(players) {
  var i, j, k, len, partner, pivot, ref, remaining, rest, result, sp, subPairings;
  if (players.length === 0) {
    return [[]];
  }
  pivot = players[0];
  rest = players.slice(1);
  result = [];
  for (i = j = 0, ref = rest.length; (0 <= ref ? j < ref : j > ref); i = 0 <= ref ? ++j : --j) {
    partner = rest[i];
    remaining = rest.slice(0, i).concat(rest.slice(i + 1));
    subPairings = generatePairings(remaining);
    for (k = 0, len = subPairings.length; k < len; k++) {
      sp = subPairings[k];
      result.push([[pivot, partner]].concat(sp));
    }
  }
  echo(result);
  return result;
};

calculate();

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