#!/usr/bin/perl -w

# OSM Map CGI - creating a HTML page that starts in the right place

# The file from which we get the Template for Openlayers?
$openlayerstemplate = '/var/www/index.openlayers.html';

# Your should not need to change anything below this line
# ----------------------------------------------------------------------------

use CGI qw(:standard);
use CGI qw/escape unescape escapeHTML unescapeHTML/;

print("Content-type: text/html\n\n");
my $lon = -999.0;
my $lat = -999.0;
my $mlon = -999.0;
my $mlat = -999.0;
my $zoom = -1;
my $baselayer = undef;
if (defined(param('lon'))) {
  $lon = param('lon');
  unless ($lon =~ m/^-{0,1}\d+\.\d+$/) { $lon = -999.0; }
  if (($lon < -180.0) || ($lon > 180.0)) { $lon = -999.0; }
}
if (defined(param('lat'))) {
  $lat = param('lat');
  unless ($lat =~ m/^-{0,1}\d+\.\d+$/) { $lat = -999.0; }
  if (($lat < -90.0) || ($lat > 90.0)) { $lat = -999.0; }
}
if (defined(param('mlon'))) {
  $mlon = param('mlon');
  unless ($mlon =~ m/^-{0,1}\d+\.\d+$/) { $mlon = -999.0; }
  if (($mlon < -180.0) || ($mlon > 180.0)) { $mlon = -999.0; }
}
if (defined(param('mlat'))) {
  $mlat = param('mlat');
  unless ($mlat =~ m/^-{0,1}\d+\.\d+$/) { $mlat = -999.0; }
  if (($mlat < -90.0) || ($mlat > 90.0)) { $mlat = -999.0; }
}
if (defined(param('zoom'))) {
  $zoom = param('zoom');
  unless ($zoom =~ m/^\d+$/) { $zoom = -1; }
  if (($zoom < 0) || ($zoom > 30)) { $lat = -1; }
}
if (defined(param('layers'))) {
  my @layerlist = ('osmde', 'osmorg');
  my $layers = param('layers');
  my $i;
  for ($i = 0; $i < int(@layerlist); $i++) {
    if (substr($layers, $i, 1) eq 'B') { # This is our baselayer
      $baselayer = $layerlist[$i];
    }
  }
}
# If mlon/mlat is defined but lon/lat isn't, use mlat/mlon as center pos.
if (($lon == -999.0) && ($lat == -999.0)) {
  if ($mlat != -999.0) { $lat = $mlat; }
  if ($mlon != -999.0) { $lon = $mlon; }
}
my $OLF;
unless (open($OLF, '<' . $openlayerstemplate)) {
  print("Sorry, failed to read my map template.\n"); exit(0);
}
while ($ll = <$OLF>) {
  #      var lon = 11.028847;
  #      var lat = 49.573836;
  #      var zoom = 16;
  if ($lon >= -180.0) {
    $ll =~ s/var\s+lon\s*=\s*-{0,1}\d+\.\d+;/var lon = $lon;/;
  }
  if ($lat >= -90.0) {
    $ll =~ s/var\s+lat\s*=\s*-{0,1}\d+\.\d+;/var lat = $lat;/;
  }
  # In any case, because the script understands the "invalid" value!
  $ll =~ s/var\s+mlon\s*=\s*-{0,1}\d+\.\d+;/var mlon = $mlon;/;
  $ll =~ s/var\s+mlat\s*=\s*-{0,1}\d+\.\d+;/var mlat = $mlat;/;
  if ($zoom >= 0) {
    $ll =~ s/var\s+zoom\s*=\s*\d+;/var zoom = $zoom;/;
  }
  if (($lon >= -180.0) && ($lat >= -180.0) && ($zoom >= 0)) { # All values required in that case
    my $rest = '';
    if (defined($baselayer)) {
      $rest .= '&maptype=' . $baselayer;
    }
    if (($mlon != -999.0) && ($mlat != -999.0)) {
      $rest .= "&markers=$mlat,$mlon,ol-marker";
    }
    $ll =~ s!<img src="(.*?)/staticmaplite\?.*?size=([^"&]+).*?"!<img src="$1/staticmaplite?center=$lat,$lon&zoom=$zoom&size=$2$rest"!;
  }
  print($ll);
}
close($OLF);
