public function sales_per_category()
{
$colors = array();
$colors[] = '#a3e1d4';
$colors[] = '#dedede';
$colors[] = '#b5b8cf';
$data = array();
foreach (InvoiceItem::total()->byKind()->get() as $item) {
$data[$item->kind ? $item->kind : self::LABEL_OTHERS] = array('amount' => $item->total, 'color' => array_shift($colors));
}
$total = 0;
foreach ($data as $k => $v) {
$total += $data[$k]['amount'];
}
foreach ($data as $k => $v) {
$data[$k]['ratio'] = $total ? sprintf('%0.2f', 100 * $data[$k]['amount'] / $total) : 0;
}
return View::make('stats.pie', array('data' => $data, 'total' => $total));
}
