#!/usr/bin/perl -w

# index.cgi:
# Main code for FixMyStreet
#
# Copyright (c) 2006 UK Citizens Online Democracy. All rights reserved.
# Email: matthew@mysociety.org. WWW: http://www.mysociety.org
#
# $Id: index.cgi,v 1.140 2007-06-16 19:42:25 matthew Exp $

use strict;
require 5.8.0;

# Horrible boilerplate to set up appropriate library paths.
use FindBin;
use lib "$FindBin::Bin/../perllib";
use lib "$FindBin::Bin/../../perllib";
use Error qw(:try);
use File::Slurp;
use Image::Magick;
use LWP::Simple;
use RABX;
use CGI::Carp;
use Digest::MD5 qw(md5_hex);
use URI::Escape;

use Page;
use mySociety::AuthToken;
use mySociety::Config;
use mySociety::DBHandle qw(dbh select_all);
use mySociety::Gaze;
use mySociety::GeoUtil;
use mySociety::Util;
use mySociety::MaPit;
use mySociety::VotingArea;
use mySociety::Web qw(ent NewURL);

BEGIN {
    mySociety::Config::set_file("$FindBin::Bin/../conf/general");
    mySociety::DBHandle::configure(
        Name => mySociety::Config::get('BCI_DB_NAME'),
        User => mySociety::Config::get('BCI_DB_USER'),
        Password => mySociety::Config::get('BCI_DB_PASS'),
        Host => mySociety::Config::get('BCI_DB_HOST', undef),
        Port => mySociety::Config::get('BCI_DB_PORT', undef)
    );

    if (!dbh()->selectrow_array('select secret from secret for update of secret')) {
        local dbh()->{HandleError};
        dbh()->do('insert into secret (secret) values (?)', {}, unpack('h*', mySociety::Util::random_bytes(32)));
    }
    dbh()->commit();
}

# Main code for index.cgi
sub main {
    my $q = shift;

    my $out = '';
    my %params;
    if ($q->param('submit_problem')) {
        $params{title} = 'Submitting your problem';
        $out = submit_problem($q);
    } elsif ($q->param('submit_update')) {
        $params{title} = 'Submitting your update';
        ($out) = submit_update($q);
    } elsif ($q->param('submit_map')) {
        $params{title} = 'Reporting a problem';
        $out = display_form($q);
    } elsif ($q->param('id')) {
        ($out, %params) = display_problem($q);
        $params{title} .= ' - Viewing a problem';
    } elsif ($q->param('pc') || ($q->param('x') && $q->param('y'))) {
        ($out, %params) = display_location($q);
        $params{title} = 'Viewing a location';
    } else {
        $out = front_page($q);
    }
    print Page::header($q, %params);
    print $out;
    print Page::footer();
    dbh()->rollback();
}
Page::do_fastcgi(\&main);

# Display front page
sub front_page {
    my ($q, $error) = @_;
    my $pc_h = ent($q->param('pc') || '');
    my $out = <<EOF;
<p id="expl"><strong>Report, view, or discuss local problems</strong>
<br><small>(like graffiti, fly tipping, broken paving slabs, or street lighting)</small></p>
EOF
    $out .= '<p id="error">' . $error . '</p>' if ($error);
    my $fixed = dbh()->selectrow_array("select count(*) from problem where state='fixed' and lastupdate>ms_current_timestamp()-'1 month'::interval");
    my $updates = dbh()->selectrow_array("select count(*) from comment where state='confirmed'");
    my $new = dbh()->selectrow_array("select count(*) from problem where state in ('confirmed','fixed') and confirmed>ms_current_timestamp()-'1 week'::interval");
    $out .= <<EOF;
<form action="./" method="get" id="postcodeForm">
<label for="pc">Enter a nearby postcode, or street name and area:</label>
&nbsp;<input type="text" name="pc" value="$pc_h" id="pc" size="10" maxlength="200">
&nbsp;<input type="submit" value="Go" id="submit">
</form>

<div id="front_intro">

<h2>How to report a problem</h2>

<ol>
<li>Enter a nearby postcode, or street name and area
<li>Locate the problem on a map of the area
<li>Enter details of the problem
<li>We send it to the council on your behalf
</ol>

<h2>FixMyStreet updates</h2>

<div id="front_stats">
<div><big>$new</big> reports in past week</div>
<div><big>$fixed</big> fixed in past month</div>
<div><big>$updates</big> updates on reports</div>
</div>

</div>

<div id="front_recent">
EOF

    my $probs = select_all("select id, title from problem
        where state in ('confirmed', 'fixed') and photo is not null
        order by confirmed desc limit 3");
    $out .= '<h2>Photos of recent reports</h2>' if @$probs;
    foreach (@$probs) {
        my $title = ent($_->{title});
        $out .= '<a href="/?id=' . $_->{id} .
            '"><img border="0" src="/photo?tn=1;id=' . $_->{id} .
            '" alt="' . $title . '" title="' . $title . '"></a>';
    }
    $probs = select_all("select id,title from problem
        where state in ('confirmed', 'fixed')
        order by confirmed desc limit 5");
    $out .= '<h2>Recently reported problems</h2> <ul>' if @$probs;
    foreach (@$probs) {
        $out .= '<li><a href="/?id=' . $_->{id} . '">'. ent($_->{title});
        $out .= '</a>';
    }
    $out .= '</ul>' if @$probs;
    $out .= '</div>';

    return $out;
}

sub submit_update {
    my $q = shift;
    my @vars = qw(id name email update fixed);
    my %input = map { $_ => $q->param($_) || '' } @vars;
    my @errors;
    push(@errors, 'Please enter a message') unless $input{update} =~ /\S/;
    $input{name} = undef unless $input{name} =~ /\S/;
    if ($input{email} !~ /\S/) {
        push(@errors, 'Please enter your email');
    } elsif (!mySociety::Util::is_valid_email($input{email})) {
        push(@errors, 'Please enter a valid email');
    }
    return display_problem($q, @errors) if (@errors);

    my $id = dbh()->selectrow_array("select nextval('comment_id_seq');");
    dbh()->do("insert into comment
        (id, problem_id, name, email, website, text, state, mark_fixed)
        values (?, ?, ?, ?, ?, ?, 'unconfirmed', ?)", {},
        $id, $input{id}, $input{name}, $input{email}, '', $input{update},
        $input{fixed}?'t':'f');
    my %h = ();
    $h{update} = $input{update};
    $h{name} = $input{name} ? $input{name} : "Anonymous";
    $h{url} = mySociety::Config::get('BASE_URL') . '/C/' . mySociety::AuthToken::store('update', $id);
    dbh()->commit();

    my $out = Page::send_email($input{email}, $input{name}, 'update', %h);
    return $out;
}

sub submit_problem {
    my $q = shift;
    my @vars = qw(council title detail name email phone pc easting northing skipped anonymous category);
    my %input = map { $_ => scalar $q->param($_) } @vars;
    my @errors;

    my $fh = $q->upload('photo');
    if ($fh) {
        my $ct = $q->uploadInfo($fh)->{'Content-Type'};
        my $cd = $q->uploadInfo($fh)->{'Content-Disposition'};
        # Must delete photo param, otherwise display functions get confused
        $q->delete('photo');
        push (@errors, 'Please upload a JPEG image only') unless
            ($ct eq 'image/jpeg' || $ct eq 'image/pjpeg');
    }

    push(@errors, 'No council selected') unless ($input{council} && $input{council} =~ /^(?:-1|[\d,]+(?:\|[\d,]+)?)$/);
    push(@errors, 'Please enter a subject') unless $input{title} =~ /\S/;
    push(@errors, 'Please enter some details') unless $input{detail} =~ /\S/;
    push(@errors, 'Please enter your name') unless $input{name} =~ /\S/;
    if ($input{email} !~ /\S/) {
        push(@errors, 'Please enter your email');
    } elsif (!mySociety::Util::is_valid_email($input{email})) {
        push(@errors, 'Please enter a valid email');
    }
    if ($input{category} && $input{category} eq '-- Pick a category --') {
        push (@errors, 'Please choose a category');
        $input{category} = '';
    }
 
    if ($input{easting} && $input{northing}) {
        if ($input{council} =~ /^[\d,]+(\|[\d,]+)?$/) {
            my $no_details = $1 || '';
            my $councils = mySociety::MaPit::get_voting_area_by_location_en($input{easting}, $input{northing}, 'polygon', $mySociety::VotingArea::council_parent_types);
            my %councils = map { $_ => 1 } @$councils;
            my @input_councils = split /,|\|/, $input{council};
            foreach (@input_councils) {
                if (!$councils{$_}) {
                    push(@errors, 'That location is not part of that council');
                    last;
                }
            }

            if ($no_details) {
                $input{council} =~ s/\Q$no_details\E//;
                @input_councils = split /,/, $input{council};
            }

            # Check category here, won't be present if council is -1
            my @valid_councils = @input_councils;
            if ($input{category}) {
                my $categories = select_all("select area_id from contacts
                    where deleted='f' and area_id in ("
                    . $input{council} . ') and category = ?', $input{category});
                push (@errors, 'Please choose a category') unless @$categories;
                @valid_councils = map { $_->{area_id} } @$categories;
                foreach my $c (@valid_councils) {
                    if ($no_details =~ /$c/) {
                        push(@errors, 'We have details for that council');
                        $no_details =~ s/,?$c//;
                    }
                }
            }
            $input{council} = join(',', @valid_councils) . $no_details;
        }
    } elsif ($input{easting} || $input{northing}) {
        push(@errors, 'Somehow, you only have one co-ordinate. Please try again.');
    } else {
        push(@errors, 'You haven\'t specified any sort of co-ordinates. Please try again.');
    }
    
    my $image;
    if ($fh) {
        try {
            $image = Image::Magick->new;
            my $err = $image->Read(file => \*$fh); # Mustn't be stringified
            close $fh;
            throw Error::Simple("read failed: $err") if "$err";
            $err = $image->Scale(geometry => "250x250>");
            throw Error::Simple("resize failed: $err") if "$err";
            my @blobs = $image->ImageToBlob();
            undef $image;
            $image = $blobs[0];
        } catch Error::Simple with {
            my $e = shift;
            push(@errors, "That image doesn't appear to have uploaded correctly ($e), please try again.");
        };
    }

    return display_form($q, @errors) if (@errors);

    delete $input{council} if $input{council} eq '-1';
    my $used_map = $input{skipped} ? 'f' : 't';
    $input{category} = 'Other' unless $input{category};

    my $id = dbh()->selectrow_array("select nextval('problem_id_seq');");
    # This is horrid
    my $s = dbh()->prepare("insert into problem
        (id, postcode, easting, northing, title, detail, name,
         email, phone, photo, state, council, used_map, anonymous, category)
        values
        (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 'unconfirmed', ?, ?, ?, ?)");
    $s->bind_param(1, $id);
    $s->bind_param(2, $input{pc});
    $s->bind_param(3, $input{easting});
    $s->bind_param(4, $input{northing});
    $s->bind_param(5, $input{title});
    $s->bind_param(6, $input{detail});
    $s->bind_param(7, $input{name});
    $s->bind_param(8, $input{email});
    $s->bind_param(9, $input{phone});
    $s->bind_param(10, $image, { pg_type => DBD::Pg::PG_BYTEA });
    $s->bind_param(11, $input{council});
    $s->bind_param(12, $used_map);
    $s->bind_param(13, $input{anonymous} ? 'f': 't');
    $s->bind_param(14, $input{category});
    $s->execute();
    my %h = ();
    $h{title} = $input{title};
    $h{detail} = $input{detail};
    $h{name} = $input{name};
    $h{url} = mySociety::Config::get('BASE_URL') . '/P/' . mySociety::AuthToken::store('problem', $id);
    dbh()->commit();

    my $out = Page::send_email($input{email}, $input{name}, 'problem', %h);
    return $out;
}

sub display_form {
    my ($q, @errors) = @_;
    my ($pin_x, $pin_y, $pin_tile_x, $pin_tile_y) = (0,0,0,0);
    my @vars = qw(title detail name email phone pc easting northing x y skipped council anonymous);
    my %input = map { $_ => $q->param($_) || '' } @vars;
    my %input_h = map { $_ => $q->param($_) ? ent($q->param($_)) : '' } @vars;
    my @ps = $q->param;
    foreach (@ps) {
        ($pin_tile_x, $pin_tile_y, $pin_x) = ($1, $2, $q->param($_)) if /^tile_(\d+)\.(\d+)\.x$/;
        $pin_y = $q->param($_) if /\.y$/;
    }
    return display_location($q)
        unless ($pin_x && $pin_y)
            || ($input{easting} && $input{northing})
            || ($input{skipped} && $input{x} && $input{y})
            || ($input{skipped} && $input{pc});

    my $out = '';
    my ($px, $py, $easting, $northing, $island);
    if ($input{skipped}) {
        # Map is being skipped
        if ($input{x} && $input{y}) {
            $easting = Page::tile_to_os($input{x});
            $northing = Page::tile_to_os($input{y});
        } else {
            my ($x, $y, $e, $n, $i, $error) = geocode($input{pc});
            $easting = $e; $northing = $n; $island = $i;
        }
    } elsif ($pin_x && $pin_y) {
        # Map was clicked on
        $pin_x = Page::click_to_tile($pin_tile_x, $pin_x);
        $pin_y = Page::click_to_tile($pin_tile_y, $pin_y, 1);
        $px = Page::tile_to_px($pin_x, $input{x});
        $py = Page::tile_to_px($pin_y, $input{y});
        $easting = Page::tile_to_os($pin_x);
        $northing = Page::tile_to_os($pin_y);
    } else {
        # Normal form submission
        $px = Page::os_to_px($input{easting}, $input{x});
        $py = Page::os_to_px($input{northing}, $input{y});
        $easting = $input_h{easting};
        $northing = $input_h{northing};
    }

    my $all_councils = mySociety::MaPit::get_voting_area_by_location_en($easting, $northing,
        'polygon', $mySociety::VotingArea::council_parent_types);
    my $areas_info = mySociety::MaPit::get_voting_areas_info($all_councils);

    # Look up categories for this council or councils
    my $category = '';
    my %council_ok;
    my $categories = select_all("select area_id, category from contacts
        where deleted='f' and area_id in (" . join(',', @$all_councils) . ')');
    @$categories = sort { $a->{category} cmp $b->{category} } @$categories;
    my @categories;
    foreach (@$categories) {
        $council_ok{$_->{area_id}} = 1;
        next if $_->{category} eq 'Other';
        push @categories, $_->{category};
    }
    if (@categories) {
        @categories = ('-- Pick a category --', @categories, 'Other');
        $category = $q->div($q->label({'for'=>'form_category'}, 'Category:'), 
            $q->popup_menu(-name=>'category', -values=>\@categories,
                -attributes=>{id=>'form_category'})
        );
    }

    my @councils = keys %council_ok;
    my $details;
    if (@councils == @$all_councils) {
        $details = 'all';
    } elsif (@councils == 0) {
        $details = 'none';
    } else {
        $details = 'some';
    }

    if ($input{skipped}) {
        $out .= <<EOF;
<form action="./" method="post">
<input type="hidden" name="pc" value="$input_h{pc}">
<input type="hidden" name="skipped" value="1">
<h1>Reporting a problem</h1>
<ul>
EOF
    } else {
        my $pins = Page::display_pin($q, $px, $py, 'purple');
        $out .= Page::display_map($q, x => $input{x}, y => $input{y}, type => 2,
            pins => $pins, px => $px, py => $py );
        $out .= '<h1>Reporting a problem</h1> <ul>';
        $out .= '<li>You have located the problem at the point marked with a purple pin on the map.
If this is not the correct location, simply click on the map again. ';
    }

    if ($details eq 'all') {
        $out .= '<li>All the details you provide here will be sent to <strong>'
            . join('</strong> or <strong>', map { $areas_info->{$_}->{name} } @$all_councils)
            . '</strong>. We show the subject and details of the problem on
            the site, along with your name if you give us permission.';
        $out .= '<input type="hidden" name="council" value="' . join(',',@$all_councils) . '">';
    } elsif ($details eq 'some') {
        my $e = mySociety::Config::get('CONTACT_EMAIL');
        my %councils = map { $_ => 1 } @councils;
        my @missing;
        foreach (@$all_councils) {
            push @missing, $_ unless $councils{$_};
        }
        my $n = @missing;
        my $list = join(' or ', map { $areas_info->{$_}->{name} } @missing);
        $out .= '<li>All the details you provide here will be sent to <strong>'
            . join('</strong> or <strong>', map { $areas_info->{$_}->{name} } @councils)
            . '</strong>. We show the subject and details of the problem on
            the site, along with your name if you give us permission.';
        $out .= ' We do <strong>not</strong> yet have details for the other council';
        $out .= ($n>1) ? 's that cover' : ' that covers';
        $out .= " this location. You can help us by finding a contact email address for local
problems for $list and emailing it to us at <a href='mailto:$e'>$e</a>.";
        $out .= '<input type="hidden" name="council" value="' . join(',', @councils)
            . '|' . join(',', @missing) . '">';
    } else {
        my $e = mySociety::Config::get('CONTACT_EMAIL');
        my $list = join(' or ', map { $areas_info->{$_}->{name} } @$all_councils);
        my $n = @$all_councils;
        $out .= '<li>We do not yet have details for the council';
        $out .= ($n>1) ? 's that cover' : ' that covers';
        $out .= " this location. If you submit a problem here it will be
left on the site, but <strong>not</strong> reported to the council.
You can help us by finding a contact email address for local
problems for $list and emailing it to us at <a href='mailto:$e'>$e</a>.";
        $out .= '<input type="hidden" name="council" value="-1">';
    }
    if ($input{skipped}) {
        $out .= '<li>Please fill in the form below with details of the problem, and
describe the location as precisely as possible in the details box.';
    } elsif ($details ne 'none') {
        $out .= '<li>Please fill in details of the problem below. The council won\'t be able
to help unless you leave as much detail as you can, so please describe the exact location of
the problem (e.g. on a wall), what it is, how long it has been there, a description, etc.';
    } else {
        $out .= '<li>Please fill in details of the problem below.';
    }
    $out .= '</ul>
<input type="hidden" name="easting" value="' . $easting . '">
<input type="hidden" name="northing" value="' . $northing . '">';

    if (@errors) {
        $out .= '<ul id="error"><li>' . join('</li><li>', @errors) . '</li></ul>';
    }
    my $anon = ($input{anonymous}) ? ' checked' : ($input{title} ? '' : ' checked');
    $out .= <<EOF;
<fieldset><legend>Problem details</legend>
$category
<div><label for="form_title">Subject:</label>
<input type="text" value="$input_h{title}" name="title" id="form_title" size="30"></div>
<div><label for="form_detail">Details:</label>
<textarea name="detail" id="form_detail" rows="7" cols="27">$input_h{detail}</textarea></div>
<div><label for="form_name">Name:</label>
<input type="text" value="$input_h{name}" name="name" id="form_name" size="30"></div>
<div class="checkbox"><input type="checkbox" name="anonymous" id="form_anonymous" value="1"$anon>
<label for="form_anonymous">Can we show your name on the site?</label>
<small>(we never show your email address or phone number)</small></div>
<div><label for="form_email">Email:</label>
<input type="text" value="$input_h{email}" name="email" id="form_email" size="30"></div>
<div><label for="form_phone">Phone:</label>
<input type="text" value="$input_h{phone}" name="phone" id="form_phone" size="20">
<small>(optional, so the council can get in touch)</small></div>
<div><label for="form_photo">Photo:</label>
<input type="file" name="photo" id="form_photo"></div>
<p>Please note:</p>
<ul>
<li>Please be polite, concise and to the point.
<li>Please do not be abusive &mdash; abusing your council devalues the service for all users.
<li>Writing your message entirely in block capitals makes it hard to read,
as does a lack of punctuation.
<li>Remember that FixMyStreet is primarily for reporting physical
problems that can be fixed. If your problem is not appropriate for
submission via this site remember that you can contact your council
directly using their own website.
</ul>
<p align="right"><input type="submit" name="submit_problem" value="Submit"></p>
</fieldset>
EOF
    $out .= Page::display_map_end(1);
    return $out;
}

sub display_location {
    my ($q, @errors) = @_;

    my @vars = qw(pc x y);
    my %input = map { $_ => $q->param($_) || '' } @vars;
    my %input_h = map { $_ => $q->param($_) ? ent($q->param($_)) : '' } @vars;

    my($error, $easting, $northing, $island);
    my $x = $input{x}; my $y = $input{y};
    $x ||= 0; $x += 0;
    $y ||= 0; $y += 0;
    return front_page($q, @errors) unless $x || $y || $input{pc};
    if (!$x && !$y) {
        try {
            ($x, $y, $easting, $northing, $island, $error) = geocode($input{pc});
        } catch Error::Simple with {
            $error = shift;
        };
    }
    return geocode_choice($error) if (ref($error) eq 'ARRAY');
    return front_page($q, $error) if ($error);

    my ($pins, $current_map, $current, $fixed, $dist) = map_pins($q, $x, $y);
    my $out = Page::display_map($q, x => $x, y => $y, type => 1, pins => $pins );
    $out .= '<h1>Problems in this area</h1>';
    if (@errors) {
        $out .= '<ul id="error"><li>' . join('</li><li>', @errors) . '</li></ul>';
    }
    my $skipurl = NewURL($q, 'submit_map'=>1, skipped=>1);
    $out .= <<EOF;
<p id="text_map">To report a problem, simply <strong>click on the map</strong> at the correct location.</p>

<p id="text_no_map"><small>If you cannot see a map &ndash; if you have images turned off,
or are using a text only browser, for example &ndash; and you
wish to report a problem, please
<a href="$skipurl">skip this step</a> and we will ask you
to describe the location of your problem instead.</small></p>
EOF
    $out .= <<EOF;
<div>
<h2>Recent problems reported near here</h2>
EOF
    my $list = '';
    foreach (@$current_map) {
        $list .= '<li><a href="' . NewURL($q, id=>$_->{id}, x=>undef, y=>undef) . '">';
        $list .= $_->{title};
        $list .= '</a></li>';
    }
    if (@$current_map) {
        $out .= '<ol id="current">' . $list . '</ol>';
    } else {
        $out .= '<p>No problems have been reported yet.</p>';
    }
    $out .= <<EOF;
    <h2>Closest problems within ${dist}km</h2>
    <p><a href="/rss/$x,$y"><img align="right" src="/i/feed.png" width="16" height="16" title="RSS feed of recent local problems" alt="RSS feed" border="0"></a></p>
EOF
    $list = '';
    foreach (@$current) {
        $list .= '<li><a href="' . NewURL($q, id=>$_->{id}, x=>undef, y=>undef) . '">';
        $list .= $_->{title} . ' (c. ' . int($_->{distance}/100+.5)/10 . 'km)';
        $list .= '</a></li>';
    }
    if (@$current) {
        my $list_start = @$current_map + 1;
        $out .= '<ol id="current_near" start="' . $list_start . '">' . $list . '</ol>';
    } else {
        $out .= '<p>No problems have been reported yet.</p>';
    }
    $out .= <<EOF;
    <h2>Recently fixed problems within ${dist}km</h2>
EOF
    $list = '';
    foreach (@$fixed) {
        $list .= '<li><a href="' . NewURL($q, id=>$_->{id}, x=>undef, y=>undef) . '">';
        $list .= $_->{title} . ' (c. ' . int($_->{distance}/100+.5)/10 . 'km)';
        $list .= '</a></li>';
    }
    if (@$fixed) {
        $out .= "<ol>$list</ol>\n";
    } else {
        $out .= '<p>No problems have been fixed yet</p>';
    }
    $out .= '</div>';
    $out .= Page::display_map_end(1);

    my %params = (
        rss => [ 'Recent local problems, FixMyStreet', "/rss/$x,$y" ]
    );

    return ($out, %params);
}

sub display_problem {
    my ($q, @errors) = @_;

    my @vars = qw(id name email update fixed x y);
    my %input = map { $_ => $q->param($_) || '' } @vars;
    my %input_h = map { $_ => $q->param($_) ? ent($q->param($_)) : '' } @vars;
    $input{x} ||= 0; $input{x} += 0;
    $input{y} ||= 0; $input{y} += 0;

    # Get all information from database
    my $problem = dbh()->selectrow_hashref(
        "select id, easting, northing, council, category, title, detail, photo,
             used_map, name, anonymous, extract(epoch from confirmed) as time,
             state, extract(epoch from whensent-confirmed) as whensent,
             extract(epoch from ms_current_timestamp()-lastupdate) as duration
         from problem where id=? and state in ('confirmed','fixed', 'hidden')", {}, $input{id});
    return display_location($q, 'Unknown problem ID') unless $problem;
    return front_page($q, 'That problem has been hidden from public view as it contained inappropriate public details') if $problem->{state} eq 'hidden';
    my $x = Page::os_to_tile($problem->{easting});
    my $y = Page::os_to_tile($problem->{northing});
    my $x_tile = $input{x} || int($x);
    my $y_tile = $input{y} || int($y);
    my $px = Page::os_to_px($problem->{easting}, $x_tile);
    my $py = Page::os_to_px($problem->{northing}, $y_tile);

    my $out = '';

    my $pins = Page::display_pin($q, $px, $py, 'blue');
    $out .= Page::display_map($q, x => $x_tile, y => $y_tile, type => 0,
        pins => $pins, px => $px, py => $py );
    $out .= $q->p({id => 'unknown'}, _('This problem is old and of unknown status.'))
        if $problem->{state} eq 'confirmed' && $problem->{duration} > 8*7*24*60*60;
    $out .= $q->p({id => 'fixed'}, _('This problem has been fixed.'))
        if $problem->{state} eq 'fixed';
    $out .= Page::display_problem_text($q, $problem);

    $out .= $q->p({align=>'right'},
        $q->small($q->a({href => '/contact?id=' . $input{id}}, 'Offensive? Unsuitable? Tell us'))
    );

    # Try and have pin near centre of map
    $x_tile -= 1 if $x - $x_tile < 0.5;
    $y_tile -= 1 if $y - $y_tile < 0.5;
    my $back = NewURL($q, id=>undef, x=>$x_tile, y=>$y_tile);
    $out .= '<p style="padding-bottom: 0.5em; border-bottom: dotted 1px #999999;" align="right"><a href="' . $back . '">More problems nearby</a></p>';

    $out .= '<a href="/rss/'.$input_h{id}.'"><img align="right" src="/i/feed.png" width="16" height="16" title="RSS feed" alt="RSS feed of updates to this problem" border="0" hspace="4"></a> ';
    $out .= '<a id="email_alert" href="/alert?type=updates;id='.$input_h{id}.'"><img src="/i/email.png" width="16" height="16" title="Email alerts" alt="Email alerts of updates to this problem" border="0"></a>';
    $out .= <<EOF;
<form action="alert" method="post" id="email_alert_box">
<p>Receive email when updates are left on this problem</p>
<label class="n" for="alert_email">Email:</label>
<input type="text" name="email" id="alert_email" value="$input_h{email}" size="30">
<input type="hidden" name="id" value="$input_h{id}">
<input type="hidden" name="type" value="updates">
<input type="submit" value="Subscribe">
</form>
EOF

    $out .= Page::display_problem_updates($input{id});
    $out .= '<h2>Provide an update</h2>';
    $out .= $q->p($q->small('Please note that updates are not sent to the council.'));
    if (@errors) {
        $out .= '<ul id="error"><li>' . join('</li><li>', @errors) . '</li></ul>';
    }

    my $fixed = ($input{fixed}) ? ' checked' : '';
    my $fixedline = $problem->{state} eq 'fixed' ? '' : qq{
<div class="checkbox"><input type="checkbox" name="fixed" id="form_fixed" value="1"$fixed>
<label for="form_fixed">This problem has been fixed</label></div>
};
    $out .= <<EOF;
<form method="post" action="./">
<fieldset><legend>Update details</legend>
<input type="hidden" name="submit_update" value="1">
<input type="hidden" name="id" value="$input_h{id}">
<div><label for="form_name">Name:</label>
<input type="text" name="name" id="form_name" value="$input_h{name}" size="20"> (optional)</div>
<div><label for="form_email">Email:</label>
<input type="text" name="email" id="form_email" value="$input_h{email}" size="20"></div>
<div><label for="form_update">Update:</label>
<textarea name="update" id="form_update" rows="7" cols="30">$input_h{update}</textarea></div>
$fixedline
<div class="checkbox"><input type="submit" value="Post"></div>
</fieldset>
</form>
EOF
    $out .= Page::display_map_end(0);

    my %params = (
        rss => [ 'Updates to this problem, FixMyStreet', "/rss/$input_h{id}" ],
        title => $problem->{title}
    );
    return ($out, %params);
}

sub map_pins {
    my ($q, $x, $y) = @_;

    my $pins = '';
    my $min_e = Page::tile_to_os($x-1);
    my $min_n = Page::tile_to_os($y-1);
    my $mid_e = Page::tile_to_os($x+1);
    my $mid_n = Page::tile_to_os($y+1);
    my $max_e = Page::tile_to_os($x+3);
    my $max_n = Page::tile_to_os($y+3);

    my $current_map = select_all(
        "select id,title,easting,northing from problem where state='confirmed'
         and easting>=? and easting<? and northing>=? and northing<?
         order by created desc limit 9", $min_e, $max_e, $min_n, $max_n);
    my @ids = ();
    my $count_prob = 1;
    my $count_fixed = 1;
    foreach (@$current_map) {
        push(@ids, $_->{id});
        my $px = Page::os_to_px($_->{easting}, $x);
        my $py = Page::os_to_px($_->{northing}, $y);
        $pins .= Page::display_pin($q, $px, $py, 'red', $count_prob++);
    }

    my ($lat, $lon) = mySociety::GeoUtil::national_grid_to_wgs84($mid_e, $mid_n, 'G');
    my $dist = mySociety::Gaze::get_radius_containing_population($lat, $lon, 200000);
    $dist = int($dist*10+0.5)/10;

    # XXX: Change to only show problems with extract(epoch from ms_current_timestamp()-lastupdate) < 8 weeks
    # And somehow display/link to old problems somewhere else...
    my $current = [];
    if (@$current_map < 9) {
        my $limit = 9 - @$current_map;
        $current = select_all(
            "select id, title, easting, northing, distance
                from problem_find_nearby(?, ?, $dist) as nearby, problem
                where nearby.problem_id = problem.id
                and state = 'confirmed'" . (@ids ? ' and id not in (' . join(',' , @ids) . ')' : '') . "
             order by distance, created desc limit $limit", $mid_e, $mid_n);
        foreach (@$current) {
            my $px = Page::os_to_px($_->{easting}, $x);
            my $py = Page::os_to_px($_->{northing}, $y);
            $pins .= Page::display_pin($q, $px, $py, 'red', $count_prob++);
        }
    }
    my $fixed = select_all(
        "select id, title, easting, northing, distance
            from problem_find_nearby(?, ?, $dist) as nearby, problem
            where nearby.problem_id = problem.id and state='fixed'
         order by created desc limit 9", $mid_e, $mid_n);
    foreach (@$fixed) {
        my $px = Page::os_to_px($_->{easting}, $x);
        my $py = Page::os_to_px($_->{northing}, $y);
        $pins .= Page::display_pin($q, $px, $py, 'green', $count_fixed++);
    }
    return ($pins, $current_map, $current, $fixed, $dist);
}

sub geocode_choice {
    my $choices = shift;
    my $out = '<p>We found more than one match for that location:</p> <ul>';
    foreach my $choice (@$choices) {
        my $qs = $choice->[0];
        my $text = $choice->[1];
        $text =~ s/<\/?(?:b|i)>//g;
        $text =~ s/, United Kingdom//;
        $qs =~ s/,\+United\+Kingdom//;
        $out .= '<li><a href="/?pc=' . $qs . '">' . $text . "</a></li>\n";
    }
    $out .= '</ul>';
    return $out;
}

sub geocode {
    my ($s) = @_;
    my ($x, $y, $easting, $northing, $island, $error);
    if (mySociety::Util::is_valid_postcode($s)) {
        try {
            my $location = mySociety::MaPit::get_location($s);
            $island = $location->{coordsyst};
            throw RABX::Error("We do not cover Northern Ireland, I'm afraid, as our licence doesn't include any maps for the region.") if $island eq 'I';
            $easting = $location->{easting};
            $northing = $location->{northing};
            my $xx = Page::os_to_tile($easting);
            my $yy = Page::os_to_tile($northing);
            $x = int($xx);
            $y = int($yy);
            $x -= 1 if ($xx - $x < 0.5);
            $y -= 1 if ($yy - $y < 0.5);
        } catch RABX::Error with {
            my $e = shift;
            if ($e->value() && ($e->value() == mySociety::MaPit::BAD_POSTCODE
               || $e->value() == mySociety::MaPit::POSTCODE_NOT_FOUND)) {
                $error = 'That postcode was not recognised, sorry.';
            } else {
                $error = $e;
            }
        }
    } else {
        ($x, $y, $easting, $northing, $error) = geocode_string($s);
    }
    return ($x, $y, $easting, $northing, $island, $error);
}

sub geocode_string {
    my $s = shift;
    $s = lc($s);
    $s =~ s/[^-&0-9a-z ']/ /g;
    $s = uri_escape($s);
    $s =~ s/%20/+/g;
    my $url = 'http://maps.google.co.uk/maps?output=js&q=' . $s;
    my $cache_dir = mySociety::Config::get('GEO_CACHE');
    my $cache_file = $cache_dir . md5_hex($url);
    my ($js, $error, $x, $y, $easting, $northing);
    if (-s $cache_file) {
        $js = File::Slurp::read_file($cache_file);
    } else {
        $url .= ',+United+Kingdom' unless $url =~ /United\+Kingdom$/;
        $js = LWP::Simple::get($url);
        File::Slurp::write_file($cache_file, $js) if $js;
    }
    if (!$js) {
        $error = 'Sorry, we had a problem parsing that location. Please try again.';
    } elsif ($js =~ /suggest noprint/ && $js =~ /We could not understand/) {
        $error = $1;
    } elsif ($js =~ /suggest noprint/) {
        while ($js =~ /<div class=\\042ref\\042><a href=\\042\/maps\?q=(.*?)&.*?>(.*?)<\/a><\/div>/g) {
            push (@$error, [ $1, $2 ]);
        }
        $error = 'We could not understand that location.' unless $error;
    } elsif ($js =~ /BT\d/) {
        # Northern Ireland, hopefully
        $error = "We do not cover Northern Ireland, I'm afraid, as our licence doesn't include any maps for the region.";
    } else {
        $js =~ /center: {lat: (.*?),lng: (.*?)}/;
        my $lat = $1; my $lon = $2;
        ($easting,$northing) = mySociety::GeoUtil::wgs84_to_national_grid($lat, $lon, 'G');
        $x = int(Page::os_to_tile($easting))-1;
        $y = int(Page::os_to_tile($northing))-1;
    }
    return ($x, $y, $easting, $northing, $error);
}