<h1><img src='images/bulb7.jpg' height='12'>Meter Charges</h1>
<?php
$tbl = "el_billing";

$recal = $_REQUEST["recal"];
$ext = $_REQUEST["ext"];
$month = $_REQUEST["month"];

if (!$month) $month = previous_month();//date("M-Y");

echo "<b>Meter billing of</b> <select name='month'>";
$rs = mysql_query("select distinct month from el_reading order by id desc");
while ($o = mysql_fetch_object($rs)) {
	echo "<option value='$o->month'";
	if ($o->month == $month) echo " selected";
	echo ">$o->month</option>";
}
echo "</select> <input type='submit' name='submit' value='OK'>
<input type='hidden' name='ext' value='$ext'>";

$rs = mysql_query("select * from el_config");
if (mysql_num_rows($rs)) {
	$o = mysql_fetch_object($rs);
	$unitrate = $o->unitrate;
	$fixedrate = $o->fixedrate;
	$plrate = $o->plrate;
	$edrate = $o->edrate;
	$rscrate = $o->rscrate;
	$subsidymode = $o->subsidymode;
}

//$rs = mysql_query("select * from $tbl where month='$month' order by flatno");
$rs = mysql_query("select * from (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') el_billing2
  order by external,left(flatno, pos-1), mid(flatno, pos, length(flatno)-pos+1)+0");

while ($o = mysql_fetch_object($rs)) {
	$i++;
	$flatno = $o->flatno;
	$licensee = $o->licensee;
	$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;
	
	$prevreading = $o->prevreading;
	$curreading = $o->curreading;

	$consumedunit = $curreading - $prevreading;
	$consumedcharge = $consumedunit * $unitrate;
	
	$fixedcharge = $contactedload * $fixedrate;
	$subtotal = $consumedcharge + $fixedcharge;
	
	$plcharge = $contactedload * $plrate;
	$edcharge = $subtotal * $edrate/100;
	$rscharge = $subtotal * $rscrate/100;
		
	$totalamount = $subtotal + $plcharge + $edcharge + $rscharge;
	
	$payable = $totalamount;
	if ($consumedunit > $subsidy) {
		$excessunit =  $consumedunit - $subsidy;
		$payable = $excessunit * $unitrate;
	} else {
		$excessunit =  0;
		$payable = $totalamount;
	}
	$tunit += $consumedunit;
	$tcharge += $consumedcharge;
	$tamount += $totalamount;
	$tsubsidy += $subsidy;
	$tpayable += $payable;
	
	$data .= "<tr><td>$i</td>
	<td><a href='?pg=elreceipt&id=$o->id'>$flatno</a></td>
	<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($consumedcharge,2)."</td>
	<td align='right'>".number_format($fixedcharge,2)."</td>
	<td align='right'>".number_format(round($subtotal),2)."</td>
	<td align='right'>".number_format($plcharge,2)."</td>
	<td align='right'>".number_format($edcharge,2)."</td>
	<td align='right'>".number_format($rscharge,2)."</td>
	<td align='right'>Rs.".number_format($totalamount,2)."</td>
	<td align='right'>".number_format($subsidy,2)."</td>
	<td align='right'>".number_format($excessunit,2)."</td>
	<td align='right'>Rs.".number_format($payable,2)."</td></tr>";
}

echo "<p><table width='100%' border='1' style='border-collapse: collapse'>
<thead>
<tr><th colspan='16'>Electricity bill for the month of $month 
(Unit rate: Rs. $unitrate, Fixed rate: $fixedrate/KVA/month, P.Load rate: $plrate/KVA/month, 
ED rate: $edrate%, Reg. Surcharge: $rscrate%)</th></tr>
<tr><th rowspan='2'>No</th>
<th rowspan='2'>SiteNo</th>
<th rowspan='2'>Licensee</th>
<th rowspan='2'>MeterNo</th>
<th rowspan='2'>Contacted<br>Load</th>
<th colspan='2'>KWH Meter Reading</th>
<th colspan='2'>Consumption</th>
<th colspan='6'>Connection Charges</th>
<th rowspan='2'>Admissibility</th><th rowspan='2'>Excess<br>Units</th>
<th rowspan='2'>Payable<br>Amount</th></tr>
<tr><th>Previous</th><th>Current</th><th>Units</th><th>Charges</th>
<th>Fixed</th><th>SubTotal</th><th>PLC</th><th>ED</th><th>Sur</th><th>Total</th>
</tr>
</thead>
<tfoot>
<tr><th colspan='7'>Total</th>
<th>".number_format($tunit,2)."</th>
<th>Rs.".number_format(round($tcharge),2)."</th>
<td colspan='5'></td><th nowrap>Rs.".number_format($tamount,2)."</th>
<th>".number_format($tsubsidy,2)."</th><td></td>
<th>Rs.".number_format(round($tpayable),2)."</th></tr>
<tr><th colspan='16'>Above readings have been taken on the last dates of this and previous month.</th></tr>
</tfoot>
<tbody>$data</tbody>
</table></p>";

?>