</%doc>
<%args>
$quri
+$dbh
$commodstring => '';
+$prselector
$someresults
$emsgokorprint
</%args>
my $qa= \%ARGS;
</%perl>
-<h1>Select commodity</h1>
+<h1>Commodity enquiry</h1>
+
+% $prselector->('BuySell');
%#---------- textbox, user enters route as string ----------
% if (!$qa->{Dropdowns}) {
<form action="<% $quri->() |h %>" method="get">
-<&| qtextstring, qa => $qa, thingstring => 'commodstring', emsgstore => \$emsg,
+<&| qtextstring, qa => $qa, dbh => $dbh,
+ thingstring => 'commodstring', emsgstore => \$emsg,
perresult => sub { ($commodname,$commodid)= @_; }
&>
size=80
</form>
%#========== results ==========
-% $emsgokorprint->($emsg) or $commodid=undef;
+<%perl>
-% if (defined $commodid) {
-% $someresults->();
-COMMODITY <% $commodid %> named <% $commodname |h %>
+$emsgokorprint->($emsg) or $commodid=undef;
+return unless defined $commodid;
+$someresults->();
+
+#---------- actually compute the results and print them ----------
+
+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 $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
+
+</%perl>
-% }
+<h2>Offers to <% uc $bs |h %> <% $commodname |h %></h2>
+
+<table>
+<tr>
+<th colspan=3>
+<th colspan=2>Prices
+<th colspan=3>Quantities available
+<tr>
+<th>Archipelago
+<th>Island
+<th>Unique best stall
+<th>Best
+<th>Median
+<th>At best
+<th>Within 10%
+<th>Total
+</tr>
+% $islands->execute($commodid);
+% my $island;
+% while ($island= $islands->fetchrow_hashref) {
+% my $islandid= $island->{'islandid'};
+% $offers->execute($commodid, $islandid);
+% my ($offer, $bestprice, $median, $marginal, @beststalls);
+% my $tqty= $island->{'tqty'};
+% my $cqty= 0;
+% my $bestqty= 0;
+% my $approxqty= 0;
+% while ($offer= $offers->fetchrow_hashref) {
+% my $price= $offer->{'price'};
+% my $qty= $offer->{'qty'};
+% defined $bestprice or $bestprice= $price;
+% if ($price == $bestprice) {
+% $bestqty += $qty;
+% push @beststalls, $offer->{'stallname'};
+% }
+% $cqty += $qty;
+% if ($cqty*2 >= $tqty && !defined $median) {
+% $median= $price;
+% }
+% if ($bestprice*9 <= $price*10 and
+% $price*10 <= $bestprice*11) {
+% $approxqty += $qty;
+% }
+% }
+% my $nstalls= @beststalls;
+% $cqty == $tqty or die "$bs $cqty $tqty $commodid $islandid ";
+<tr> <td><% $island->{'archipelago'} |h %>
+ <td><% $island->{'islandname'} |h %>
+ <td><% $nstalls==1 ? $beststalls[0] : "$nstalls offers" |h %>
+ <td><% $bestprice %>
+ <td><% $median %>
+ <td><% $bestqty %>
+ <td><% $approxqty %>
+ <td><% $tqty %>
+</tr>
+% }
+</table>
+
+<%perl>
+}
+</%perl>