<?php
$tbl = "el_billing";

//fetch rates
$rs = mysql_query("select * from el_config");
if (mysql_num_rows($rs)) {
	$o = mysql_fetch_object($rs);
	$unitrate = $o->unitrate;
	$fixedrate = $o->fixedrate;
	$plrate = $o->plrate;
	$edrate = $o->edrate;
	$rscrate = $o->rscrate;
	$subsidymode = $o->subsidymode;
}
$sql = "select *,
    	least(
      	case when locate('0', flatno)>0 then locate('0', flatno) else length(flatno)+1 end,
      	case when locate('1', flatno)>0 then locate('1', flatno) else length(flatno)+1 end,
      	case when locate('2', flatno)>0 then locate('2', flatno) else length(flatno)+1 end,
      	case when locate('3', flatno)>0 then locate('3', flatno) else length(flatno)+1 end,
      	case when locate('4', flatno)>0 then locate('4', flatno) else length(flatno)+1 end,
      	case when locate('5', flatno)>0 then locate('5', flatno) else length(flatno)+1 end,
      	case when locate('6', flatno)>0 then locate('6', flatno) else length(flatno)+1 end,
      	case when locate('7', flatno)>0 then locate('7', flatno) else length(flatno)+1 end,
      	case when locate('8', flatno)>0 then locate('8', flatno) else length(flatno)+1 end,
      	case when locate('9', flatno)>0 then locate('9', flatno) else length(flatno)+1 end) pos
  	from $tbl where month='$month'";
	$sql .= ($ext ? " and external='Yes'" : '');
	$sql .= ($catlist ? " and category in ($catlist)" : '');
  	$sql .= " order by left(flatno, pos-1), mid(flatno, pos, length(flatno)-pos+1)+0";

$rs = mysql_query($sql);
while ($o = mysql_fetch_object($rs)) {
        $i++;
        $id = $o->id;
        $flatno = $o->flatno;
        $licensee = $o->licensee;
        $userfees = $o->userfees;
        $meterno = $o->meterno;
        $contactedload = $o->contactedload;
        $unitrate = $o->unitrate;
        $fixedrate = $o->fixedrate;
        $plrate = $o->plrate;
        $edrate = $o->edrate;
        $rscrate = $o->rscrate;
        $subsidy = $o->subsidy;
        $external = $o->external;
        $category = $o->category;

        $prevreading = $o->prevreading;
        $curreading = $o->curreading;
        $addunits = $o->addunits;

        $consumedunit = $curreading - $prevreading + $addunits;
        $consumedcharge = $consumedunit * $unitrate;

        $excessunit =  $consumedunit - $subsidy;

        if ($external == 'Yes') {
                $fixedcharge = $contactedload * $fixedrate;
                $subtotal = $consumedcharge + $fixedcharge;

                $plcharge = $contactedload * $plrate;
                $edcharge = $subtotal * $edrate/100;
                $rscharge = $subtotal * $rscrate/100;

                $totalamount = $subtotal + $plcharge + $edcharge + $rscharge;

                $payable = $totalamount;
        } else {
                if ($excessunit > 0) {
                        $excesscharge = $excessunit * $unitrate;
                } else {
                        $excessunit =  0;
                        $excesscharge = 0;
                }
                $payable = $excesscharge;
        }
        //payable with userfees
        $payable += $userfees;
        //summarized figures
	$tunit += $consumedunit;
	$tcharge += $consumedcharge;
	$tamount += $totalamount;
	$tsubsidy += $subsidy;
	$tpayable += $payable;
	
	$data .= "<tr><td><a href='?pg=elreceipt&id=$o->id'>$i</a></td>
	<th>$flatno</th><td nowrap>$licensee</td><td>$meterno</td><td>$contactedload</td><td>$prevreading</td><td>$curreading</td>
	<td align='right'>".number_format($consumedunit,2)."</td>
	<td align='right'>Rs.".number_format($consumedcharge,2)."</td>
	<td align='right'>Rs.".number_format($fixedcharge,2)."</td>
	<td align='right'>Rs.".number_format($subtotal,2)."</td>
	<td align='right'>Rs.".number_format($plcharge,2)."</td>
	<td align='right'>Rs.".number_format($edcharge,2)."</td>
	<td align='right'>Rs.".number_format($rscharge,2)."</td>
	<td align='right'>Rs.".number_format($totalamount,2)."</td>
	<td align='right'>".($subsidymode == 'Rupees' ? 'Rs.' : '').number_format($subsidy,2).
	($subsidymode == 'Units' ? ' units': '')."</td>
	<td align='right'>".number_format($excessunit,2)."</td>
	<td align='right'>Rs.".number_format($userfees,2)."</td>
	<td align='right'>Rs.".number_format($payable,2)."</td></tr>";
}

echo "<table width='100%' border='1' style='border-collapse: collapse'>
<thead>
<tr><th colspan='19'><h3>Electricity bill for the month of $month</h3> 
(Unit rate: Rs. $unitrate, Fixed rate: $fixedrate/KVA/month, P.Load rate: $plrate/KVA/month, 
ED rate: $edrate%, Reg. Surcharge: $rscrate%)</th></tr>
<tr><th rowspan='2'>No</th>
<th rowspan='2'>SiteNo</th>
<th rowspan='2'>Licensee</th>
<th rowspan='2'>MeterNo</th>
<th rowspan='2'>Contacted<br>Load</th>
<th colspan='2'>KWH Meter Reading</th>
<th colspan='2'>Consumption</th>
<th colspan='6'>Connection Charges</th>
<th rowspan='2'>Admissibility</th><th rowspan='2'>Excess<br>Units</th>
<th rowspan='2'>User<br>Charges</th>
<th rowspan='2'>Payable<br>Amount</th></tr>
<tr><th>Previous</th><th>Current</th><th>Units</th><th>Charge</th>
<th>Fixed</th><th>SubTotal</th><th>PLC</th><th>ED</th><th>Sur</th><th>Total</th>
</tr>
</thead>
<tfoot>
<tr><th colspan='18'>Total</th><th>Rs.".number_format($tpayable,2)."</th></tr>
<tr><th colspan='19'>Above readings have been taken on the last dates of this and previous month.</th></tr>
</tfoot>
<tbody>$data</tbody>
</table>";

?>