foreach my $bs (split /_/, $ARGS{BuySell}) {
$bs =~ m/^(buy|sell)$/ or die;
$bs= $1;
+ my ($ascdesc) = ($bs eq 'buy')
+ ? ('DESC')
+ : ('ASC');
+
+ my $islands= $dbh->prepare(
+ "SELECT islandid, archipelago, islandname, sum(qty) as tqty
+ FROM $bs NATURAL JOIN islands
+ WHERE commodid = ?
+ GROUP BY islandid,
+ ORDER BY archipelago, islandname"
+ );
- my $sth= $dbh->prepare(
- "SELECT archipelago, islandname, stallname, price, qty
- FROM $bs NATURAL JOIN stalls NATURAL JOIN islands
- WHERE commodid = ?"
+ my $offers= $dbh->prepare(
+ "SELECT stallname, price, qty
+ FROM $bs NATURAL JOIN stalls
+ WHERE commodid = ? AND islandid = ?
+ ORDER BY price $ascdesc"
);
# fixme this query is utterly wrong
- $sth->execute($commodid);
-
</%perl>
<h2>Offers to <% uc $bs |h %> <% $commodname |h %></h2>
<tr>
<th>Archipelago
<th>Island
-<th>Best stall
+<th>Unique best stall
<th>Best price
<th>Qty at best
+<th>Median price
+<th>Total qty
</tr>
-% my $row;
-% while ($row=$sth->fetchrow_hashref) {
-<tr> <td><% $row->{'archipelago'} %>
- <td><% $row->{'islandname'} %>
- <td><% $row->{'stallname'} %>
- <td><% $row->{'price'} %>
- <td><% $row->{'qty'} %>
+% $islands->execute($commodid);
+% my $island;
+% while ($island= $islands->fetchrow_hashref) {
+% my $islandid= $island->{'islandid'};
+% $offers->execute($commodid, $islandid);
+% my ($offer, $best, $median);
+% my $tqty= $island->{'tqty'};
+% my $cqty= 0;
+% while ($offer= $offers->fetchrow_hashref) {
+% if (!$best) {
+% $best= { 'price' => $offer->{'price'} };
+% }
+% if ($offer->{'price'} == $best->{'price'}) {
+% $best->{'qty'} += $offer->{'qty'};
+% push @{ $best->{'stalls'} },
+% $offer->{'stallname'};
+% }
+% $cqty += $offer->{'qty'};
+% if ($cqty*2 >= $tqty && !defined $median) {
+% $median= $offer->{'price'};
+% }
+% }
+% $cqty == $tqty or die "$bs $cqty $tqty $commodid $islandid ";
+% my $nstalls= @{ $best->{'stalls'} };
+<tr> <td><% $island->{'archipelago'} |h %>
+ <td><% $island->{'islandname'} |h %>
+ <td><% $nstalls==1 ? $best->{'stalls'}[0] : "$nstalls offers" |h %>
+ <td><% $best->{'price'} %>
+ <td><% $best->{'qty'} %>
+ <td><% $median %>
+ <td><% $tqty %>
</tr>
% }
</table>