/**
  * Statictics by time.
  * @param MongoDate $from
  * @param MongoDate $to
  * @return array
  */
 private function staticticsFoodByTime($from, $to)
 {
     $fDao = new FoodDAO();
     $d = new MongoDate(strtotime($to));
     // 		echo date("Y-m-d H:i:s", $d->sec);
     $foodWithUnitPrices = $fDao->getListFoodWithUnitPrice($from, $to);
     // 2. Compute total values
     $result = array();
     foreach ($foodWithUnitPrices as $key => $food) {
         $temp["MaMonAn"] = $food["MaMonAn"];
         $temp["TenMonAn"] = $food["TenMonAn"];
         $revenues = $fDao->getFoodAmout($food["MaChiTietThucDon_MonAn"]);
         $temp["TongDoanhThu"] = $revenues == null ? 0 : $revenues;
         $result[] = $temp;
     }
     return $result;
 }
    /**
     * show table html food info confirmation.
     * @param unknown_type $MaCTThucDon_MonAns
     * @param unknown_type $amounts
     */
    public function htmlShowFoodInfoConfirmTable($MaCTThucDon_MonAns, $amounts, $bookingID)
    {
        $idSize = count($MaCTThucDon_MonAns);
        $amountSize = count($amounts);
        if ($idSize != $amountSize) {
            return;
        }
        $html = '<table>
		<tr>
		<th>Món ăn</th>
		<th>Đơn giá</th>
		<th>Số lượng</th>
		<th>Thành tiền</th>
		</tr>';
        $total = 0;
        $dao = new FoodDAO();
        for ($i = 0; $i < $idSize; $i++) {
            $data = $dao->getFoodByMenuFoodDetailID($MaCTThucDon_MonAns[$i]);
            $value = $amounts[$i] * $data["DonGia"];
            $total += $value;
            // generate html
            $html .= "<tr><td class='cell_import' value=\"" . $data["MaChiTietThucDon_MonAn"] . "\">" . $data["TenMonAn"] . "</td>";
            $html .= '
			<td class="cell_import">' . $data["DonGia"] . '</td>
			<td class="cell_import">' . $amounts[$i] . '</td>
			<td class="cell_import">' . $value . '</td>
			</tr>
			';
        }
        $html .= '</table>';
        $overview = '<p>Xin xác nhận lại thông tin đã nhập và nhấp "Lưu"</p>';
        $overview .= '<table>
		<tr>
		<td>Ngày lập</td>
		<td>' . date("Y-m-d H:i:s");
        $overview .= '</td>
		</tr>
		<tr>
		<td>Mã phiếu đặt chỗ</td>
		<td>' . $bookingID;
        $overview .= '</td>
		</tr>
		<tr>
		<td>Tổng tiền</td>
		<td id="total">' . $total;
        $overview .= '</td>
		</tr>
		</table>';
        return $overview . $html;
    }