=head1 NAME

CFPlus - undocumented utility garbage for our crossfire client

=head1 SYNOPSIS

 use CFPlus;

=head1 DESCRIPTION

=over 4

=cut

package CFPlus;

use Carp ();

BEGIN {
   $VERSION = '0.96';

   use XSLoader;
   XSLoader::load "CFPlus", $VERSION;
}

BEGIN {
   $SIG{__DIE__} = sub {
      return if CFPlus::in_destruct;
      #CFPlus::fatal $_[0];#d#
      CFPlus::error Carp::longmess $_[0];#d#
      die;#d#
   };
}

use utf8;

use AnyEvent ();
use BerkeleyDB;
use Pod::POM ();
use Scalar::Util ();
use Storable (); # finally

BEGIN {
   use Crossfire::Protocol::Base ();
   *to_json   = \&Crossfire::Protocol::Base::to_json;
   *from_json = \&Crossfire::Protocol::Base::from_json;
}

=item guard { BLOCK }

Returns an object that executes the given block as soon as it is destroyed.

=cut

sub guard(&) {
   bless \(my $cb = $_[0]), "CFPlus::Guard"
}

sub CFPlus::Guard::DESTROY {
   ${$_[0]}->()
}

sub asxml($) {
   local $_ = $_[0];

   s/&/&/g;
   s/>/>/g;
   s/</&lt;/g;

   $_
}

sub socketpipe() {
   socketpair my $fh1, my $fh2, Socket::AF_UNIX, Socket::SOCK_STREAM, Socket::PF_UNSPEC
      or die "cannot establish bidiretcional pipe: $!\n";

   ($fh1, $fh2)
}

sub background(&;&) {
   my ($bg, $cb) = @_;

   my ($fh_r, $fh_w) = CFPlus::socketpipe;

   my $pid = fork;

   if (defined $pid && !$pid) {
      local $SIG{__DIE__};

      open STDOUT, ">&", $fh_w;
      open STDERR, ">&", $fh_w;
      close $fh_r;
      close $fh_w;

      $| = 1;

      eval { $bg->() };

      if ($@) {
         my $msg = $@;
         $msg =~ s/\n+/\n/;
         warn "FATAL: $msg";
         CFPlus::_exit 1;
      }

      # win32 is fucked up, of course. exit will clean stuff up,
      # which destroys our database etc. _exit will exit ALL
      # forked processes, because of the dreaded fork emulation.
      CFPlus::_exit 0;
   }

   close $fh_w;

   my $buffer;

   my $w; $w = AnyEvent->io (fh => $fh_r, poll => 'r', cb => sub {
      unless (sysread $fh_r, $buffer, 4096, length $buffer) {
         undef $w;
         $cb->();
         return;
      }

      while ($buffer =~ s/^(.*)\n//) {
         my $line = $1;
         $line =~ s/\s+$//;
         utf8::decode $line;
         if ($line =~ /^\x{e877}json_msg (.*)$/s) {
            $cb->(from_json $1);
         } else {
            ::message ({
               markup => "background($pid): " . CFPlus::asxml $line,
            });
         }
      }
   });
}

sub background_msg {
   my ($msg) = @_;

   $msg = "\x{e877}json_msg " . to_json $msg;
   $msg =~ s/\n//g;
   utf8::encode $msg;
   print $msg, "\n";
}

package CFPlus::Database;

our @ISA = BerkeleyDB::Btree::;

sub get($$) {
   my $data;

   $_[0]->db_get ($_[1], $data) == 0
      ? $data
      : ()
}

my %DB_SYNC;

sub put($$$) {
   my ($db, $key, $data) = @_;

   my $hkey = $db + 0;
   Scalar::Util::weaken $db;
   $DB_SYNC{$hkey} ||= AnyEvent->timer (after => 5, cb => sub {
      delete $DB_SYNC{$hkey};
      $db->db_sync if $db;
   });

   $db->db_put ($key => $data)
}

package CFPlus;

sub find_rcfile($) {
   my $path;

   for (grep !ref, @INC) {
      $path = "$_/CFPlus/resources/$_[0]";
      return $path if -r $path;
   }

   die "FATAL: can't find required file $_[0]\n";
}

sub read_cfg {
   my ($file) = @_;

   open my $fh, $file
      or return;

   local $/;
   my $CFG = <$fh>;

   if ($CFG =~ /^---/) { ## TODO compatibility cruft, remove
      require YAML;
      utf8::decode $CFG;
      $::CFG = YAML::Load ($CFG);
   } elsif ($CFG =~ /^\{/) {
      $::CFG = from_json $CFG;
   } else {
      $::CFG = eval $CFG; ## todo comaptibility cruft
   }
}

sub write_cfg {
   my ($file) = @_;

   $::CFG->{VERSION} = $::VERSION;

   open my $fh, ">:utf8", $file
      or return;
   print $fh to_json $::CFG;
}

sub http_proxy {
   my @proxy = win32_proxy_info;

   if (@proxy) {
      "http://" . (@proxy < 2 ? "" : @proxy < 3 ? "$proxy[1]\@" : "$proxy[1]:$proxy[2]\@") . $proxy[0]
   } elsif (exists $ENV{http_proxy}) {
      $ENV{http_proxy}
   } else {
     ()
   }
}

sub set_proxy {
   my $proxy = http_proxy
      or return;

   $ENV{http_proxy} = $proxy;
}

sub lwp_useragent {
   require LWP::UserAgent;
   
   CFPlus::set_proxy;

   my $ua = LWP::UserAgent->new (
      agent      => "cfplus $VERSION",
      keep_alive => 1,
      env_proxy  => 1,
      timeout    => 30,
   );
}

sub lwp_check($) {
   my ($res) = @_;

   $res->is_error
      and die $res->status_line;

   $res
}

our $DB_ENV;
our $DB_STATE;

sub db_table($) {
   my ($table) = @_;

   $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;

   new CFPlus::Database
      -Env      => $DB_ENV,
      -Filename => $table,
#      -Filename => "database",
#      -Subname  => $table,
      -Property => DB_CHKSUM,
      -Flags    => DB_CREATE | DB_UPGRADE,
         or die "unable to create/open database table $_[0]: $BerkeleyDB::Error"
}

{
   use strict;

   mkdir "$Crossfire::VARDIR/cfplus", 0777;
   my $recover = $BerkeleyDB::db_version >= 4.4 
                 ? eval "DB_REGISTER | DB_RECOVER"
                 : 0;

   $DB_ENV = new BerkeleyDB::Env
                    -Home => "$Crossfire::VARDIR/cfplus",
                    -Cachesize => 1_000_000,
                    -ErrFile => "$Crossfire::VARDIR/cfplus/errorlog.txt",
#                 -ErrPrefix => "DATABASE",
                    -Verbose => 1,
                    -Flags => DB_CREATE | DB_RECOVER | DB_INIT_MPOOL | DB_INIT_LOCK | DB_INIT_TXN | $recover,
                    -SetFlags => DB_AUTO_COMMIT | DB_LOG_AUTOREMOVE,
                       or die "unable to create/open database home $Crossfire::VARDIR/cfplus: $BerkeleyDB::Error";

   $DB_STATE = db_table "state";
}

package CFPlus::Layout;

$CFPlus::OpenGL::SHUTDOWN_HOOK{"CFPlus::Layout"} = sub {
   reset_glyph_cache;
};

package CFPlus::Item;

use strict;
use Crossfire::Protocol::Constants;

my $last_enter_count = 1;

sub desc_string {
   my ($self) = @_;

   my $desc =
      $self->{nrof} < 2
         ? $self->{name}
         : "$self->{nrof} × $self->{name_pl}";

   $self->{flags} & F_OPEN
      and $desc .= " (open)";
   $self->{flags} & F_APPLIED
      and $desc .= " (applied)";
   $self->{flags} & F_UNPAID
      and $desc .= " (unpaid)";
   $self->{flags} & F_MAGIC
      and $desc .= " (magic)";
   $self->{flags} & F_CURSED
      and $desc .= " (cursed)";
   $self->{flags} & F_DAMNED
      and $desc .= " (damned)";
   $self->{flags} & F_LOCKED
      and $desc .= " *";

   $desc
}

sub weight_string {
   my ($self) = @_;

   my $weight = ($self->{nrof} || 1) * $self->{weight};

   $weight < 0 ? "?" : $weight * 0.001
}

sub do_n_dialog {
   my ($cb) = @_;

   my $w = new CFPlus::UI::Toplevel
      on_delete => sub { $_[0]->destroy; 1 },
      has_close_button => 1,
   ;

   $w->add (my $vb = new CFPlus::UI::VBox x => "center", y => "center");
   $vb->add (new CFPlus::UI::Label text => "Enter item count:");
   $vb->add (my $entry = new CFPlus::UI::Entry
      text => $last_enter_count,
      on_activate => sub {
         my ($entry) = @_;
         $last_enter_count = $entry->get_text;
         $cb->($last_enter_count);
         $w->hide;
         $w->destroy;

         0
      },
      on_escape => sub { $w->destroy; 1 },
   );
   $entry->grab_focus;
   $w->show;
}

sub update_widgets {
   my ($self) = @_;

   # necessary to avoid cyclic references
   Scalar::Util::weaken $self;

   my $button_cb = sub {
      my (undef, $ev, $x, $y) = @_;

      my $targ = $::CONN->{player}{tag};

      if ($self->{container} == $::CONN->{player}{tag}) {
         $targ = $::CONN->{open_container};
      }

      if (($ev->{mod} & CFPlus::KMOD_SHIFT) && $ev->{button} == 1) {
         $::CONN->send ("move $targ $self->{tag} 0")
            if $targ || !($self->{flags} & F_LOCKED);
      } elsif (($ev->{mod} & CFPlus::KMOD_SHIFT) && $ev->{button} == 2) {
         $self->{flags} & F_LOCKED
            ? $::CONN->send ("lock " . pack "CN", 0, $self->{tag})
            : $::CONN->send ("lock " . pack "CN", 1, $self->{tag})
      } elsif ($ev->{button} == 1) {
         $::CONN->send ("examine $self->{tag}");
      } elsif ($ev->{button} == 2) {
         $::CONN->send ("apply $self->{tag}");
      } elsif ($ev->{button} == 3) {
         my $move_prefix = $::CONN->{open_container} ? 'put' : 'drop';
         if ($self->{container} == $::CONN->{open_container}) {
            $move_prefix = "take";
         }

         my @menu_items = (
            ["examine", sub { $::CONN->send ("examine $self->{tag}") }],
            ["mark",    sub { $::CONN->send ("mark ". pack "N", $self->{tag}) }],
            ["ignite/thaw",  # first try of an easier use of flint&steel
               sub {
                  $::CONN->send ("mark ". pack "N", $self->{tag});
                  $::CONN->send ("command apply flint and steel");
               }
            ],
            ["inscribe",  # first try of an easier use of flint&steel
               sub {
                  &::open_string_query ("Text to inscribe", sub {
                     my ($entry, $txt) = @_;
                     $::CONN->send ("mark ". pack "N", $self->{tag});
                     $::CONN->send ("command use_skill inscription $txt");
                  });
               }
            ],
            ["rename",  # first try of an easier use of flint&steel
               sub {
                  &::open_string_query ("Rename item to:", sub {
                     my ($entry, $txt) = @_;
                     $::CONN->send ("mark ". pack "N", $self->{tag});
                     $::CONN->send ("command rename to <$txt>");
                  }, $self->{name},
                  "If you input no name or erase the current custom name, the custom name will be unset");
               }
            ],
            ["apply",   sub { $::CONN->send ("apply $self->{tag}") }],
            (
               $self->{flags} & F_LOCKED
               ? (
                  ["unlock", sub { $::CONN->send ("lock " . pack "CN", 0, $self->{tag}) }],
                 )
               : (
                  ["lock",   sub { $::CONN->send ("lock " . pack "CN", 1, $self->{tag}) }],
                  ["$move_prefix all",   sub { $::CONN->send ("move $targ $self->{tag} 0") }],
                  ["$move_prefix &lt;n&gt;", 
                     sub {
                        do_n_dialog (sub { $::CONN->send ("move $targ $self->{tag} $_[0]") })
                     }
                  ]
               )
            ),
         );

         CFPlus::UI::Menu->new (items => \@menu_items)->popup ($ev);
      }

      1
   };

   my $tooltip_std = "<small>"
                   . "Left click - examine item\n"
                   . "Shift-Left click - " . ($self->{container} ? "move or drop" : "take") . " item\n"
                   . "Middle click - apply\n"
                   . "Shift-Middle click - lock/unlock\n"
                   . "Right click - further options"
                   . "</small>\n";

   my $bg = $self->{flags} & F_CURSED ? [1  , 0  , 0, 0.5]
          : $self->{flags} & F_MAGIC  ? [0.2, 0.2, 1, 0.5]
          : undef;

   $self->{face_widget} ||= new CFPlus::UI::Face 
      can_events => 1,
      can_hover  => 1,
      anim       => $self->{anim},
      animspeed  => $self->{animspeed}, # TODO# must be set at creation time
      on_button_down => $button_cb,
   ;
   $self->{face_widget}{bg}        = $bg;
   $self->{face_widget}{face}      = $self->{face};
   $self->{face_widget}{anim}      = $self->{anim};
   $self->{face_widget}{animspeed} = $self->{animspeed};
   $self->{face_widget}->set_tooltip (
      "<b>Face/Animation.</b>\n"
    . "Item uses face #$self->{face}. "
    . ($self->{animspeed} ? "Item uses animation #$self->{anim} at " . (1 / $self->{animspeed}) . "fps. " : "Item is not animated. ")
    . "\n\n$tooltip_std"
   );
   
   $self->{desc_widget} ||= new CFPlus::UI::Label
      can_events => 1,
      can_hover  => 1,
      ellipsise  => 2,
      align      => -1,
      on_button_down => $button_cb,
   ;
   my $desc = CFPlus::Item::desc_string $self;
   $self->{desc_widget}{bg} = $bg;
   $self->{desc_widget}->set_text ($desc);
   $self->{desc_widget}->set_tooltip ("<b>$desc</b>.\n$tooltip_std");

   $self->{weight_widget} ||= new CFPlus::UI::Label
      can_events => 1,
      can_hover  => 1,
      ellipsise  => 0,
      align      => 0,
      on_button_down => $button_cb,
   ;
   $self->{weight_widget}{bg} = $bg;
   $self->{weight_widget}->set_text (CFPlus::Item::weight_string $self);
   $self->{weight_widget}->set_tooltip (
      "<b>Weight</b>.\n"
    . ($self->{weight} >= 0 ? "One item weighs $self->{weight}g. " : "You have no idea how much this weighs. ")
    . ($self->{nrof} ? "You have $self->{nrof} of it. " : "Item cannot stack with others of it's kind. ")
    . "\n\n$tooltip_std"
   );
}

1;

=back

=head1 AUTHOR

 Marc Lehmann <schmorp@schmorp.de>
 http://home.schmorp.de/

=cut