#!/usr/bin/perl -w
use strict;
use LWP::UserAgent;
use HTML::Entities;
use XML::Simple;
use Text::Iconv;
use Date::Parse;
use Data::Dumper;

sub str_trim($)
{
  my $str = $_[0];
  if (defined($str)) {
    $str =~ s/^\s*//;
    $str =~ s/\s*$//;
  }
  return $str;
}


sub pop_token_a($)
{
  my $tokens = $_[0];
  return shift(@$tokens);
}


sub pop_token($)
{
  return str_trim(pop_token_a($_[0]));
}


sub parse_html_str($)
{
  my $tokens = $_[0];
  my $token = pop_token($tokens);
  my $str = "";
  $token =~ s/^\s*//;

  return undef unless (substr($token, 0, 1) eq '"');
  $token = substr($token, 1);
  
  while (defined($token)) {
    my $tmp = $token;
    $tmp =~ s/\s*$//;
    if (substr($tmp, -1) eq '"') {
      $str .= substr($tmp, 0, -1);
      return $str;
    } else {
      $str .= $token;
    }
    $token = shift(@$tokens);
  }
  return undef;
}


sub parse_html_tree($$);

sub parse_html_tree($$)
{
  my ($tokens, $tree) = @_;

  while (my $token = pop_token($tokens)) {
    if ($token =~ /^<[!\/]?[a-zA-Z]+/) {
      $token = lc($token);
      if ($token =~ /^<\!.*>$/) {
        # Ignore comments etc.
      } elsif ($token =~ /^<([a-z]+[1-9]*)(.*)>$/) {
        my ($name, $args) = ($1, $2);
        if ($name eq "meta" || $name eq "img") {
          my $tmp = {};
          parse_html_tree($tokens, $tree);
          return $tree;
        } else {
          my $tmp = { "name" => $name, "args" => str_trim($args) };
          parse_html_tree($tokens, $tmp);
          push(@{$$tree{"nodes"}}, $tmp);
        }
      } elsif ($token =~ /^<\/([a-z]+[1-9]*)>$/) {
        return $tree;
      } else {
        die("HORROR TERROR ELITE: '$token'\n");
      }
    } else {
      $token = str_trim(decode_entities($token));
      push(@{$$tree{"nodes"}}, { "name" => "text", "args" => "", "text" => $token }) if length($token) > 0;
    }
  }
  
  return $tree;
}


sub parse_html($)
{
  return undef unless defined($_[0]);
  my $str = $_[0];
  my $res = { "name" => "", "args" => "" };
  $str =~ tr/\r/ /;
  $str =~ tr/\n/ /;
  my @tokens = grep { !($_ =~ /^\s*$/) } split(/(<\/?[a-zA-Z]+.*?>)/, $str);
  parse_html_tree(\@tokens, $res);
  return $res;
}

sub html_find_node($$$);

sub html_find_node($$$)
{
  my ($node, $name, $args) = @_;
  
  if (defined($node)) {
    if (ref($node) eq "ARRAY") {
      foreach my $n (@$node) {
        my $tmp = html_find_node($n, $name, $args);
        # Must do it like this, in order not to break the loop
        return $tmp if defined($tmp);
      }
    } elsif (ref($node) eq "HASH") {
      if (defined($$node{"name"})) {
        if ($$node{"name"} eq $name) {
          if ($args ne "") {
            if (defined($$node{"args"}) && $$node{"args"} =~ /$args/) {
            } else {
              return html_find_node($$node{"nodes"}, $name, $args);
            }
          }
          return $node;
        } else {
          return html_find_node($$node{"nodes"}, $name, $args);
        }
      }
    }
  }
  return undef;
}


sub fnode($$)
{
  return html_find_node($_[0], $_[1], "");
}


sub fnodea($$$)
{
  return html_find_node($_[0], $_[1], $_[2]);
}


sub fetch_http($)
{
  my $tmpAgent = LWP::UserAgent->new;
  $tmpAgent->agent("Mozilla/4.0 (compatible; MSIE 6.0; MSIE 5.5; Windows NT 6.0) Opera 10.63  [en]");
  $tmpAgent->timeout(10);

  my $tmpRequest = HTTP::Request->new(GET => $_[0]);
  
  return $tmpAgent->request($tmpRequest);
}


sub get_node($$$)
{
  return defined($_[0]->[$_[2]]{"nodes"}[0]{$_[1]}) ? $_[0]->[$_[2]]{"nodes"}[0]{$_[1]} : "";
}


sub parse_timestamp($$)
{
  return $_[1] + str2time($_[0]) - time();
}


###
### Main program begins
###
die(
"Weather Fetch v0.1 by ccr/TNSP <ccr\@tnsp.org>\n".
"Usage: $0 <output_data_file> <fmi_api_key>\n"
) unless scalar(@ARGV) >= 2;

my $opt_outfile = shift;
my $opt_api_key = shift;
my $weatherdata = {};

### Fetch tiehallinto data
for (my $i = 1; $i <= 22; $i++)
{
  my $res = fetch_http("http://alk.tiehallinto.fi/alk/tiesaa/tiesaa_maak_".$i.".html");
  if ($res->code >= 200 && $res->code <= 201)
  {
    my $data = $res->decoded_content;
    
    # Filter out crap tags we don't want or need
    $data =~ s/\n/§/g;
    $data =~ s/<!--.*?-->//ig;
    $data =~ s/<map[^>]*>.*?<\/map>//ig;
    $data =~ s/<form[^>]*>.*?<\/form>//ig;
    $data =~ s/<script[^>]*>.*?<\/script>//ig;
    $data =~ s/<meta[^>]*>//ig;
    $data =~ s/<font[^>]*>//ig;
    $data =~ s/<\/font>//ig;
    $data =~ s/<span[^>]*>//ig;
    $data =~ s/<\/span>//ig;
    $data =~ s/<\/?b>//ig;

    $data =~ s/<br>//ig;
    $data =~ s/&nbsp;/ /ig;
    $data =~ s/§/\n/g;

    # Parse the HTML mess
    my $otree = parse_html($data);

    # Find our desired element nodes
    my $odata = fnodea(fnode($otree, "body"), "div", "class=elementc");
    my $oupdate = fnode($odata, "p");
    my $time_base = time();
    if ($oupdate) {
      my $tmp = $oupdate->{"nodes"}[0]{"text"};
      if ($tmp =~ /:\s+(\d\d\.\d\d\.\d\d\d\d)\s+(\d\d:\d\d)/) {
        $time_base = str2time($1);
      }
    }
    
    my $oelems = fnode($odata, "table")->{"nodes"};
    for (my $n = 1; $n < scalar(@$oelems); $n++)
    {
      my $fdata = @$oelems[$n]->{"nodes"};
      $weatherdata->{$fdata->[0]{"nodes"}[0]{"text"}} =
      [
        parse_timestamp(get_node($fdata, "text", 1), $time_base),
        get_node($fdata, "text", 2),
        get_node($fdata, "text", 3),
        get_node($fdata, "text", 4),
        get_node($fdata, "text", 5),
      ];
    }
    print STDERR ".";
  }
}

### Fetch FMI data
my $res = fetch_http("http://data.fmi.fi/fmi-apikey/".$opt_api_key.
  "/wfs?request=getFeature&storedquery_id=fmi::observations::weather::cities::multipointcoverage".
  "&parameters=temperature,humidity");

if ($res->code >= 200 && $res->code <= 201)
{
  my $xml = XMLin($res->decoded_content,
    KeyAttr => { server => 'name' },
    ForceArray => [ 'server', 'address' ]);
}

### Output
if (defined($opt_outfile)) {
  open(STDOUT, '>', $opt_outfile) or die("Could not open output file '$opt_outfile'.\n");
}

binmode STDOUT, ':encoding(utf-8)';

foreach my $key (sort { $a cmp $b } keys %$weatherdata)
{
  print STDOUT $key."|".join("|", @{$weatherdata->{$key}})."\n";
}

close(STDOUT);