var salesGenerator = (function() {

  var items = [
    {
      name: "A",
      cost: 2,
      color: 'steelblue'
    },
      {
      name: "B",
      cost: 2.5,
      color: 'tomato'
    },
    {
      name: "C",
      cost: 1,
      color: 'mediumturquoise'
    },
    {
      name: "D",
      cost: 3,
      color: 'plum'
    }
  ]

  var newItem = function () {
    var index = Math.floor(Math.random() * (items.length));
    var time = Math.floor(Math.random() * (23));

    return {
      itemName: items[index].name,
      cost: items[index].cost,
      hour: time
    };
  }

  var data = []

  for (var i = 0; i < 1000; i++) {
    data.push(newItem());
  }

  var itemBuckets = [];

  fillBuckets = function (item) {
    var bucketData = [];
    var totalSales = 0;

    for (var i = 0; i < 24; i++) {
      bucketData[i] = 0;
    }

    data.filter(function(d) { return d.itemName === item.name; })
        .forEach(function(itemSale){
          bucketData[itemSale.hour]++;
          totalSales += itemSale.cost;
        });

    var maxSales = d3.max(bucketData);

    itemBuckets.push({
      name: item.name,
      totalSales: totalSales,
      maxSales: maxSales,
      buckets: bucketData,
      color: item.color
    })
  };

  items.forEach(function(item){
    fillBuckets(item);
  });

  return {
    itemBuckets: itemBuckets
  };

})();