use vars qw(@day_names);

my $pinni_title = "(TaY) Café Pinni";
my $bio_title = "(TAYS) Bio";
my $kliininen_title = "(TAYS) Arvo";
my $kliininen_fusion_title = "(TAYS) Arvo Fusion Kitchen";
my $zip_salaattibaari_title = "(TTY) Zip Salaattibaari";
my @restaurant_info = (
  [ "(TaY) Yliopiston Ravintola", "http://www.juvenes.fi/Suomeksi/Ravintolat_ja_kahvilat/Opiskelijaravintolat/_TaY__Yliopiston_Ravintola", "M", "left" ],
  [ "(TaY) Yliopiston Ravintola / Salaattibaari", "http://www.juvenes.fi/Suomeksi/Ravintolat_ja_kahvilat/Opiskelijaravintolat/_TaY__Yliopiston_Ravintola/Salaattibaari", "", "left" ],
  [ "(TaY) Fusion Kitchen", "http://www.juvenes.fi/Suomeksi/Ravintolat_ja_kahvilat/Opiskelijaravintolat/_TaY__Yliopiston_Ravintola/Fusion_Kitchen", "", "left" ],
  [ $pinni_title, "http://www.juvenes.fi/Suomeksi/Ravintolat_ja_kahvilat/Opiskelijaravintolat/_TaY__Caf__Pinni", "M", "middle" ],
  [ $bio_title, "http://www.juvenes.fi/Suomeksi/Ravintolat_ja_kahvilat/Opiskelijaravintolat/_TaY_Kauppi__Medica_Bio", "M", "left" ],
  [ $kliininen_title, "http://www.juvenes.fi/Suomeksi/Ravintolat_ja_kahvilat/Opiskelijaravintolat/_TaY_Kauppi__Medica_Arvo", "M", "left" ],
  [ $kliininen_fusion_title, "http://www.juvenes.fi/Suomeksi/Ravintolat_ja_kahvilat/Opiskelijaravintolat/_TaY_Kauppi__Medica_Arvo/Fusion_Kitchen", "M", "left" ],
  [ "(TTY) Newton", "http://www.juvenes.fi/Suomeksi/Ravintolat_ja_kahvilat/Opiskelijaravintolat/_TTY__Newton", "", "left" ],
  [ "(TTY) Zip", "http://www.juvenes.fi/Suomeksi/Ravintolat_ja_kahvilat/Opiskelijaravintolat/_TTY__Zip", "", "right" ],
  [ "(TTY) Edison", "http://www.juvenes.fi/Suomeksi/Ravintolat_ja_kahvilat/Opiskelijaravintolat/_TTY__Edison", "", "middle" ],
  [ $zip_salaattibaari_title, "http://www.juvenes.fi/Suomeksi/Ravintolat_ja_kahvilat/Opiskelijaravintolat/_TTY__Zip/Salaattibaari", "", "right" ],
  [ "(TTY) Pastabaari", "http://www.juvenes.fi/Suomeksi/Ravintolat_ja_kahvilat/Opiskelijaravintolat/_TTY__Caf____Fast_Voltti/Pastabaari", "", "middle" ],
  [ "(TTY) Fast Voltti", "http://www.juvenes.fi/Suomeksi/Ravintolat_ja_kahvilat/Opiskelijaravintolat/_TTY__Caf____Fast_Voltti", "", "middle" ],
  [ "(TTY) Fusion Kitchen", "http://www.juvenes.fi/Suomeksi/Ravintolat_ja_kahvilat/Opiskelijaravintolat/_TTY__Newton/Fusion_Kitchen", "", "left" ],
  [ "(TAMK) Dot", "http://www.juvenes.fi/Suomeksi/Ravintolat_ja_kahvilat/Opiskelijaravintolat/_TAMK__Dot__Ziberia_", "", "middle" ]
);

my @restaurants;
my ($parse_func, $week, $open_hours, $day_id, $cur_title);
my ($cur_food, @cur_day_foods, @week_foods);

sub parse_to_eof {
}

sub parse_skip_to_end_of_div {
  my $token = shift;
  
  if ($token->[0] eq 'E' && $token->[1] eq 'div') {
    $parse_func = \&parse_more_food;
  }
}

sub parse_open_hours_begin {
  my $token = shift;

  if ($token->[0] eq 'T') {
    if ($token->[1] =~ /^Aukiolo/) {
      $parse_func = \&parse_open_hours_end;
    }
  }
}

sub parse_open_hours_end {
  my $token = shift;

  if ($token->[0] eq 'T') {
    my $text = $token->[1];
    if ($text eq 'Erityisruokavaliot') {
      $parse_func = \&parse_to_eof;
    } else {
      $text =~ s/\n//g;
      $text =~ s/ +$//;
      $open_hours .= "$text\n" if ($text ne "");
    }
  }
}

sub finish_food {
  chomp $cur_food;
  if ($cur_food =~ /Liha paniini.*tai Kasvis paniini/i && $cur_title eq $pinni_title) {
    # you get this every day, ignore
  } else {
    push @cur_day_foods, $cur_food if ($cur_food ne "");
  }
  $cur_food = "";
}

sub finish_day {
  push @week_foods, [@cur_day_foods];
  @cur_day_foods = ();
  $day_id = $day_id + 1;
}

sub parse_more_food {
  my $token = shift;
  
  if ($token->[0] eq 'S') {
    my %attrs = %{$token->[2]};
    if ($token->[1] eq 'div') {
      if ($attrs{'style'} =~ /display: *none/) {
	# infobox, skip
	$parse_func = \&parse_skip_to_end_of_div;
      } elsif ($attrs{'class'} eq 'Column') {
	# end of food
	finish_food();
	finish_day();
	$parse_func = \&parse_open_hours_begin;
      }
    } elsif ($token->[1] eq 'br') {
      if ($br_is_new_food) {
	finish_food();
      } else {
	$cur_food .= "\n" if ($cur_food ne "" && substr($cur_food, -1) ne "\n");
      }
    }
  } elsif ($token->[0] eq 'T') {
    my $text = $token->[1];
    if ($day_id < 6 && $text eq $day_names[$day_id+1]) {
      # day changed
      finish_food();
      finish_day();
    } elsif ($text eq "&nbsp;") {
      # next food
      finish_food();
    } else {
      $text =~ tr/\r\n\t/   /;
      $text =~ s/ +/ /g;
      $text =~ s/^ +//;
      $text =~ s/^\.+//;
      $text =~ s/ +$//;
      $text =~ s/sisältää ([^, \)]+)/sis.$1/ig;
      $cur_food .= $text;
    }
  }
}

sub parse_monday {
  my $token = shift;
  
  if ($token->[0] eq 'T') {
    if ($token->[1] eq $day_names[0]) {
      $parse_func = \&parse_more_food;
    }
    elsif ($token->[1] eq $day_names[1]) {
      finish_day();
      $parse_func = \&parse_more_food;
    }
  }
}

sub parse_week {
  my $token = shift;
  
  if ($token->[0] eq 'T') {
    if ($token->[1] =~ /Viikko: (\d+)/) {
      $week = $1;
      $parse_func = \&parse_monday;
    }
  }
}

sub parse_juvenes {
  my ($fname, $info_ref) = @_;
  my $p = HTML::TokeParser->new($fname) or die("Can't open file $fname");

  my $title = @{$info_ref}[0];
  $week = "";
  $open_hours = "";
  $day_id = 0;
  $cur_food = "";
  @cur_day_foods = ();
  @week_foods = ();
  $br_is_new_food = $title eq $zip_salaattibaari_title;
  $cur_title = $title;
  
  $parse_func = \&parse_week;
  while (my $token = $p->get_token) {
    &$parse_func($token);
  }
  push @restaurants, [ $title, $open_hours, $week, [ @week_foods ], $info_ref ];
}

sub can_merge_bio_kliininen {
  my $day = shift;

  my $bio_foods = "";
  my $kliininen_foods = "";
  my $food_dest;
  foreach my $r (@restaurants) {
    my ($title, $open_hours, $week, $week_foods_ref) = @{$r};
    if ($title eq $bio_title) {
      $food_dest = \$bio_foods;
    } elsif ($title eq $kliininen_title) {
      $food_dest = \$kliininen_foods;
    } else {
      next;
    }
    my @week_foods = @{$week_foods_ref};
    foreach my $food (@{$week_foods[$day]}) {
      ${$food_dest} .= "$food\n";
    }
  }
  return $bio_foods eq $kliininen_foods;
}

sub try_merge_bio_kliininen {
  my ($title_ref, $day) = @_;
  my $title = $$title_ref;

  if ($title eq $bio_title && can_merge_bio_kliininen($day)) {
    $$title_ref .= " + Kliininen";
  } elsif ($title eq $kliininen_title && can_merge_bio_kliininen($day)) {
    return 1;
  }
  return 0;
}

sub get_juvenes_restaurants {
  my $use_old = shift;
  my $count = 0;
  foreach my $i (@restaurant_info) {
    my @info = @{$i};
    my $temp_fname = "juvenes$count.temp.html";
    my $url = $info[1];
    if (!-f $temp_fname || !$use_old) {
      system("wget -q --timeout=10 -O $temp_fname.tmp '$url' && mv $temp_fname.tmp $temp_fname");
    }
    if (-f $temp_fname) {
      parse_juvenes($temp_fname, \@info);
    }
    $count++;
  }
  return @restaurants;
}

1;