// rand int from min (inluded) to max (excluded) [MDN example]
function randRange(min, max){
  return Math.floor(Math.random() * (max - min)) + min;
}

function game (n, repick) {
  var list = new Array(n);
  list.fill(0);  // 0 - no prize
  var doorWithPrize = randRange(0, n);
  
  list[doorWithPrize] = 1; //put prize behind door
  
  var PickedDoorNumber = randRange(0, n); // initial door pick

  while(list.length > 2 && repick === true) {
    for(var i = 0, len = list.length; i < len; i++) {
      if(list[i] === 0 && i !== PickedDoorNumber) { // choose door without prise and not picked by player
        list.splice(i, 1);   // open one door - reduce doors that we can pick now
        break;
      }
    }

    PickedDoorNumber = randRange(0, list.length); // pick new door from doors that left
  }
  return list[PickedDoorNumber] === 1; //win prize ?
}


function test (N, n) {
  console.log('start without repick')
  var result = [];
  for(var i = 0, len = N; i < len; i++ ) {
    result.push(game(n, false));
  }

  var winnings = result.filter(function(itm){ return itm === true});
  console.log('Win percent: ', (winnings.length / N).toFixed(4));


  console.log('start with repick')
  var result = [];
  for(var i = 1, len = N; i <= len; i++ ) {
    result.push(game(n, true));
  }

  var winnings = result.filter(function(itm){ return itm === true});
  console.log('Win percent: ', (winnings.length / N).toFixed(4));
  return 'done';
}

test(10000, 3);

var n = 1000000;
new Array(n).join('1').split('').reduce(function(memo){
  memo += new Array(100).join('1').split('').map(function(){ return Math.random() > 0.5;}).filter(function(item){ return item;}).length / 100;
  return memo;
}, 0) / n;
// 0.4949049399999358

function main(){
  return Math.random() > 0.5
}

module.exports = {
  init: function(data){
    // м-м-м бинарничек
    console.log('бдыщь')
  },
  test: main
}