X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~yarrgweb/git?p=ypp-sc-tools.web-live.git;a=blobdiff_plain;f=yarrg%2Fweb%2Fquery_commod;h=c9b17ae6700b72a0e5ba135a14d95ff381ae3a98;hp=eddc0975d05f067358c6835a81710d97f8039b8d;hb=00ba9271fd8409f29fcae6ee2af15824810bc939;hpb=72587d0d7358ca77ecd0ede859abba7f89b1d9d2

diff --git a/yarrg/web/query_commod b/yarrg/web/query_commod
index eddc097..c9b17ae 100644
--- a/yarrg/web/query_commod
+++ b/yarrg/web/query_commod
@@ -35,7 +35,9 @@
 </%doc>
 <%args>
 $quri
+$dbh
 $commodstring => '';
+$prselector
 $someresults
 $emsgokorprint
 </%args>
@@ -47,7 +49,10 @@ my ($commodname,$commodid);
 my $qa= \%ARGS;
 </%perl>
 
-<h1>Select commodity</h1>
+<h1>Commodity enquiry</h1>
+
+% $prselector->('BuySell');
+% $prselector->('ShowBlank');
 
 %#---------- textbox, user enters route as string ----------
 % if (!$qa->{Dropdowns}) {
@@ -56,7 +61,8 @@ Enter commodity (abbreviations are OK):<br>
 
 <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
@@ -75,10 +81,101 @@ Not yet implemented.
 </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 $joinkind= $ARGS{ShowBlank} eq 'show'
+		? 'LEFT OUTER JOIN' : 'INNER JOIN';
+	my $islands= $dbh->prepare(
+	"SELECT islands.islandid AS islandid, archipelago, islandname,
+			sum(qty) as tqty
+		FROM islands $joinkind $bs offers
+		ON islands.islandid == offers.islandid AND commodid == ?
+		GROUP BY islands.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, $marginal, @beststalls);
+%		my $tqty= $island->{'tqty'};
+%		my $cqty= '';
+%		my $bestqty= '';
+%		my $approxqty= '';
+%		my $median= '-';
+%		while ($offer= $offers->fetchrow_hashref) {
+%			my $price= $offer->{'price'};
+%			my $qty= $offer->{'qty'};
+%			length $bestqty or $bestprice= $price;
+%			if ($price == $bestprice) {
+%				$bestqty += $qty;
+%				push @beststalls, $offer->{'stallname'};
+%			}
+%			$cqty += $qty;
+%			if ($cqty*2 >= $tqty && $median eq '-') {
+%				$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==0 ? '-' :
+            $nstalls==1 ? $beststalls[0] : "$nstalls offers" |h %>
+     <td><% length $bestqty ? $bestprice : '-' %>
+     <td><% $median %>
+     <td><% $bestqty %>
+     <td><% $approxqty %>
+     <td><% $cqty %>
+</tr>
+%	}
+</table>
+
+<%perl>
+}
+</%perl>