=head1 NAME

Jeweler

=head1 DESCRIPTION

The Jeweler skill helper module.

=cut

package Jeweler;

use strict;
use YAML;

=over 4

=item @RESISTS

List of all resistancies that can occur on rings and amulets.

=cut

our $CFG;

sub read_config {
   my ($filename) = @_;

   unless (-e $filename) {
      warn "$filename doesn't exists! no config for jeweler skill loaded!\n";
      $CFG = {};
      return
   }

   $CFG = YAML::LoadFile $filename;
}

sub getcfg {
   my ($sect, $key) = @_;
   return $CFG->{$sect} unless defined $key;

   my $cfg = $CFG->{$sect}->{$key}
      or die "Couldn't find $sect/$key in configuration!";

   $cfg
}

our @RESISTS = (
   cf::ATNR_PHYSICAL,
   cf::ATNR_MAGIC,
   cf::ATNR_FIRE,
   cf::ATNR_ELECTRICITY,
   cf::ATNR_COLD,
   cf::ATNR_CONFUSION,

   cf::ATNR_ACID,
   cf::ATNR_DRAIN,
   cf::ATNR_GHOSTHIT,
   cf::ATNR_POISON,
   cf::ATNR_SLOW,
   cf::ATNR_PARALYZE,

   cf::ATNR_TURN_UNDEAD,
   cf::ATNR_FEAR,
   cf::ATNR_DEPLETE,
   cf::ATNR_DEATH,
   cf::ATNR_HOLYWORD,
   cf::ATNR_LIFE_STEALING,

   cf::ATNR_BLIND,
   cf::ATNR_DISEASE,
);

=item @EFFECT_RESISTS

List of all effect resistancies that occur on rings and amulets.
The difference is made because effect resistancies are less effective at lower levels.

=back

=cut

our @EFFECT_RESISTS = (
   cf::ATNR_CONFUSION,
   cf::ATNR_DRAIN,
   cf::ATNR_POISON,
   cf::ATNR_SLOW,
   cf::ATNR_PARALYZE,
   cf::ATNR_TURN_UNDEAD,
   cf::ATNR_FEAR,
   cf::ATNR_DEPLETE,
   cf::ATNR_DEATH,
   cf::ATNR_BLIND,
   cf::ATNR_DISEASE,
);

our %RESMAP = (
   cf::ATNR_PHYSICAL => "PHYSICAL",
   cf::ATNR_MAGIC => "MAGIC",
   cf::ATNR_FIRE => "FIRE",
   cf::ATNR_ELECTRICITY => "ELECTRICITY",
   cf::ATNR_COLD => "COLD",
   cf::ATNR_CONFUSION => "CONFUSION",
   cf::ATNR_ACID => "ACID",

   cf::ATNR_DRAIN => "DRAIN",
   cf::ATNR_GHOSTHIT => "GHOSTHIT",
   cf::ATNR_POISON => "POISON",
   cf::ATNR_SLOW => "SLOW",
   cf::ATNR_PARALYZE => "PARALYZE",
   cf::ATNR_TURN_UNDEAD => "TURN_UNDEAD",

   cf::ATNR_FEAR => "FEAR",
   cf::ATNR_DEPLETE => "DEPLETE",
   cf::ATNR_DEATH => "DEATH",
   cf::ATNR_HOLYWORD => "HOLYWORD",
   cf::ATNR_LIFE_STEALING => "LIFE_STEALING",
   cf::ATNR_BLIND => "BLIND",
   cf::ATNR_DISEASE => "DISEASE",
);

our %LVL_DIFF_CHANCES = (
   +5 => 100,
   +4 => 95,
   +3 => 85,
   +2 => 75,
   +1 => 65,
   0  => 50,
   -1 => 45,
   -2 => 35,
   -3 => 25,
   -4 => 10,
   -5 => 0
);

our %LVL_DIFF_MSG = (
   -5 => 'Way above your skill',
   -4 => 'Very low',
   -3 => 'Slight chance',
   -2 => 'Low',
   -1 => 'Nearly 50:50',
   0  => '50:50',
   1  => 'Slightly above 50:50',
   2  => 'Good',
   3  => 'High',
   4  => 'Nearly confident',
   5  => '100%',
);

sub level_diff_to_str {
   my ($delta) = @_;
   $delta = -5 if $delta < -5;
   $delta =  5 if $delta >  5;
   return $LVL_DIFF_MSG{$delta}
}

sub level_diff_to_chance_perc {
   my ($delta) = @_;
   $delta = -5 if $delta < -5;
   $delta =  5 if $delta >  5;
   return $LVL_DIFF_CHANCES{$delta}
}

sub analyze {
   my ($sk, $chdl, $pl) = @_;

   my $hadunid = 0;
   for ($chdl->grep_by_type (cf::RING, cf::AMULET)) {
      if (!$_->flag (cf::FLAG_IDENTIFIED) && $_->need_identify) {
         $hadunid = 1;
         next;
      }
      my $r = Jeweler::Object->new (object => $_);
      my $msg = $r->analyze ($sk, $pl);
      $pl->message ($r->to_string . ": " . $msg);
      if ($pl->flag (cf::FLAG_WIZ)) {
         $r->wiz_analyze ($pl);
      }
   }
   if ($hadunid) {
      $pl->message ("You couldn't identify the other rings and not analyze them!");
   }
}

# this function converts metals/minerals into a raw ring (of adornment)
sub simple_converter {
   my ($pl, $ingred, $chdl, $conv) = @_;

   $conv = lc $conv;
   my $cnvs = $CFG->{conversions};

   return unless $cnvs->{$conv};

   my %ingred_groups;

   my @conv_cfg = @{$cnvs->{$conv}};
   my $outarch = $conv;
   my ($ingr_grp, $outarchvalfact, $srcarchname, $xp_gain) = @conv_cfg;

   unless (@conv_cfg <= 4) {
      warn "ERROR: Conversion for '$outarch' has only " . (@conv_cfg) . " arguments!";
      return;
   }

   unless ($xp_gain > 0) {
      warn "WARNING: xp gain isn't > 0 in convesion '$outarch'\n";
      return;
   }

   unless ($outarchvalfact) {
      warn "ERROR: source-arch-value-multiplier == 0 in conversion '$outarch'\n";
      return;
   }

   unless ($outarchvalfact >= 1) {
      warn "WARNING: source-arch-value-multiplier < 1 in conversion '$outarch', results in more valuable output!\n";
   }

   my $archvalsum = $ingred->value ($ingr_grp, $srcarchname);
   $ingred->remove ($ingr_grp, $srcarchname);

   my $outarchval = cf::arch::find ($outarch)->clone->value;

   my $nrof = int ($archvalsum / (($outarchval || 1000) * $outarchvalfact));
   if ($nrof) {
      # XXX: yes, i know what i'm doing here, i don't set nrof, but it didn't work somehow (pls. chek sometimes)
      $chdl->put (cf::object::new $outarch) for 1..$nrof;

      my $xp_sum = ($xp_gain * $nrof);

      if ($xp_sum) {
         $pl->ob->message ("You got $xp_sum xp by making $nrof ${outarch}s");
         $pl->ob->change_exp ($xp_sum, "jeweler", cf::SK_EXP_ADD_SKILL);
      }
   }
}


package Jeweler::CauldronHandler;

use strict;

=head2 CauldronHandler

The Jeweler::CauldronHandler package, that helps you with handling the
cauldron stuff. Can also be used for other skills.

=cut

sub new {
   my ($class, %arg) = @_;

   my $self = bless {
      %arg,
   }, $class;

   $self;
}

=over 4

=item find_cauldron ($arch_name, @map_stack)

This finds the cauldron with C<$arch_name> on the C<@map_stack> and initalises the CauldronHandler.
It takes the topmost cauldron that is found. Returns undef if no cauldron was found.
Returns the cauldron object if it was found.

=cut

sub find_cauldron {
   my ($self, $arch_name, @map_stack) = @_;

   my @c =
      grep {
         $_->flag (cf::FLAG_IS_CAULDRON)
            and $_->arch->name eq $arch_name
      } @map_stack;

   $self->{cauldron} = $c[0];
}

=item grep_by_type (@types)

Finds all objects in the cauldron that have the type of one of C<@types>.

=cut

sub grep_by_type {
   my ($self, @types) = @_;

   return () unless $self->{cauldron};

   my @res = grep {
      my $ob = $_;
      (grep { $ob->type == $_ } @types) > 0
   } $self->{cauldron}->inv;

   return @res
}

=item extract_jeweler_ingredients

Extracts the ingredients that matter for the Jeweler skill
and returns a Jeweler::Ingredients object.

=cut

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

   return () unless $self->{cauldron};

   my $ingreds = {};

   my %type_to_key = (
         cf::RING      => 'rings',
         cf::AMULET    => 'ammys',
         cf::INORGANIC => 'mets_and_mins',
         cf::GEM       => 'gems',
         cf::POTION    => 'potions',
         cf::SCROLL    => 'scrolls',
   );

   for ($self->{cauldron}->inv) {

      if (my $k = $type_to_key{$_->type}) {
         push @{$ingreds->{$k}}, $_;
      }
   }

   return Jeweler::Ingredients->new (ingredients => $ingreds, cauldron_helper => $self)
}

=item put ($object)

Just puts the C<$object> into the cauldron.

=cut

sub put {
   my ($self, $obj) = @_;

   return undef unless $self->{cauldron};
   $obj->insert_ob_in_ob ($self->{cauldron});
}

=back

=cut

package Jeweler::Ingredients;
use Storable qw/dclone/;
use strict;

=head2 Ingredients

This class handles the ingredients.

=over 4

=item new (ingredients => $ingred_hash)

This is called from the CauldronHandler that gives you the ingredients.

=cut

sub new {
   my ($class, %arg) = @_;

   my $self = bless {
      %arg,
   }, $class;

   $self;
}

=item value ($group, $archname)

Returns the value of the ingredients in C<$group> with the archetypename C<$archname>.

=cut

sub value {
   my ($self, $group, $archname) = @_;

   my @objs = grep {
      $_->arch->name eq $archname
   } @{$self->{ingredients}->{$group} || []};

   my $sum = 0;
   for (@objs) {
      $sum += ($_->nrof || 1) * $_->value;
   }

   return $sum;
}

=item remove ($group, $archname)

Removes the ingredients in C<$group> with archname C<$archname>.
It removes all in C<$group> if archname is undef.

=cut

sub remove {
   my ($self, $group, $archname) = @_;

   my $ingred = $self->{ingredients};

   my @out;

   for (@{$ingred->{$group}}) {
      if (defined $archname) {
         if ($_->arch->name eq $archname) {
            Jeweler::Util::remove ($_);
         } else {
            push @out, $_;
         }
      } else {
         Jeweler::Util::remove ($_);
      }
   }

   @{$ingred->{$group}} = @out;
}

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

   my $ingred = $self->{ingredients};

   for my $grp (keys %$ingred) {
      for my $pot (@{$ingred->{$grp}}) {
         for my $plan (keys %{$Jeweler::CFG->{plans}}) {
            my $plg = $Jeweler::CFG->{plans}->{$plan};
            my @plga = ();
            unless (ref $plg eq 'ARRAY') {
               push @plga, $plg;
            } else {
               @plga = @$plg;
            }
            next unless @plga > 0;
            if (Jeweler::Util::grep_for_match ($pot, @plga)) {
               return $plan;
            }
         }
      }
   }
}

sub get_ring {
   my ($self) = @_;
   return (
      @{$self->{ingredients}->{ammys} || []},
      @{$self->{ingredients}->{rings} || []}
   );
}

sub improve_ring_by_plan {
   my ($self, $plan, $ring) = @_;

   $ring = dclone ($ring);

   my $ingred = $self->{ingredients};
   my $impr = {};

   if ($plan =~ m/^stat_(\S+)$/) {
      my $statname = $1;
      my $plingred = Jeweler::getcfg (plans => $plan)
         or die "ingredients for plan '$plan' not defined!";

      my $cnt = 0;
      for my $pot (@{$ingred->{potions}}) {
         if (Jeweler::Util::grep_for_match ($pot, @$plingred)) {
            $cnt += $pot->nrof;
         }
      }

      my $maxstat = Jeweler::getcfg (maximprovements => 'stats');
      my $did_impr = 0;
      for my $x (1..$maxstat) {
         my $y = Jeweler::Object::fx ($x, 'stat_potions');

         if ($cnt <= $y->[0]) {
            $ring->{hash}->{stat}->{$statname} += $x;
            $did_impr = 1;
            last;
         }
      }

      # we want at least this improvement if we have a plan...
      $ring->{hash}->{stat}->{$statname} += 1 unless $did_impr;

   } elsif ($plan =~ m/^spec_(\S+)$/) {
   } elsif ($plan =~ m/^resist_(\S+)$/) {
   }

   return $ring;
}

sub do_grep {
   my ($self, $cb, @grepar) = @_;

   my $ingred = $self->{ingredients};


   for my $cat (keys %$ingred) {
      my @rem;
      for my $ing (@{$ingred->{$cat}}) {
         if (Jeweler::Util::grep_for_match ($ing, @grepar)) {
            unless ($cb->($ing)) {
               push @rem, $ing;
            }
         } else {
            push @rem, $ing;
         }
      }
      @{$ingred->{$cat}} = @rem;
   }
}

sub check_costs {
   my ($self, $costs, $do_remove) = @_;

   my $costs = dclone ($costs);

   for my $key (keys %$costs) {
      my @grepar;
      if ($key =~ m/^stat_(\S+)$/) {
         @grepar = @{Jeweler::getcfg (plans => $key) || []};
      } else {
         @grepar = (undef, undef, $key);
      }

      if ($do_remove) {
         my $rem = $costs->{$key};
         $self->do_grep (sub { if ($rem) { $rem = Jeweler::Util::remove ($_[0], $rem); } 1 }, @grepar);
         if ($rem > 0) {
            warn "JEWELER BUG: removed ingredients $rem > 0 after removing!";
         }
      } else {
         my $nr;
         $self->do_grep (sub { $nr += $_[0]->nrof; 0 }, @grepar);
         $costs->{$key} -= $nr;
      }
   }

   return $costs;
}

=back

=cut

sub put_to_bench {
   my ($self, $bench) = @_;

   my $ingred = $self->{ingredients};

   for my $ik (keys %$ingred) {
      for (@{$ingred->{$ik} || []}) {
         $bench->put ($_);
      }
   }
}

package Jeweler::Object;
use strict;
use POSIX;
use List::Util qw/max min sum/;

sub new {
   my ($class, %arg) = @_;

   my $self = bless { }, $class;

   $self->ring_or_ammy_to_hash ($arg{object});

   $self;
}

sub analyze {
   my ($self, $sk, $pl) = @_;

   my $sklvl = cf::exp_to_level ($sk->stats->exp);
   my $ringlvl = $self->power_to_level;

   my $tmpl;
   if ($pl->flag (cf::FLAG_WIZ)) {
      $tmpl = Jeweler::level_diff_to_chance_perc ($sklvl - $ringlvl);
   } else {
      $tmpl = Jeweler::level_diff_to_str ($sklvl - $ringlvl);
   }
   my $msg = sprintf "Projected success rate: %s", $tmpl;
   return $msg;
}

sub wiz_analyze {
   my ($self, $pl) = @_;
   my $costs = $self->calc_costs;
   my $desc  = "";
   my $lvl   = $self->power_to_level (\$desc);
   $pl->message ("costs: " . join (', ', map { "$_: " . sprintf "%.2f", $costs->{$_} } keys %$costs));
   $pl->message ("level: " . $desc);
}


sub get_chance_perc {
   my ($self, $sk) = @_;
   my $sklvl = cf::exp_to_level ($sk->stats->exp);
   my $ringlvl = $self->power_to_level;
   return Jeweler::level_diff_to_chance_perc ($sklvl - $ringlvl);
}

sub fx {
   my ($res, $cfg) = @_;
   my $or = $res;
   my $ar = $Jeweler::CFG->{functions}->{$cfg};
   if (ref $ar->[0] eq 'ARRAY') {
      $res = $res - 1;
   } else {
      $res = ceil ($res / 5) - 1;
   }
   $ar->[max (min ($res, @$ar - 1), 0)];
}

sub improve_by_ring {
   my ($self, @rings) = @_;
   my $ring = $self;
   for my $iring (@rings) {
      for my $cat (qw/stat spec resist/) {
         for my $k (keys %{$iring->{hash}->{$cat}}) {
            if ($ring->{hash}->{$cat}->{$k} < $iring->{hash}->{$cat}->{$k}) {
               $ring->{hash}->{$cat}->{$k} = $iring->{hash}->{$cat}->{$k};
            }
         }
      }
   }
}

sub negate {
   my ($self) = @_;
   for my $cat (qw/stat spec resist/) {
      for my $k (keys %{$self->{hash}->{$cat}}) {
         if ($self->{hash}->{$cat}->{$k} > 0) {
            $self->{hash}->{$cat}->{$k} *= -1;
         }
      }
   }
}

sub to_string {
   my ($self) = @_;
   my $r = $self->{hash};
   return
      $r->{arch} . " " .
      join ("",
         grep { $_ ne "" }
            join ("",
               (map {
                  my $rv = $r->{resist}->{$_};
                  "(resist " . (lc $Jeweler::RESMAP{$_}) . " " . ($rv > 0 ? '+' : '') . $rv . ")"
               } grep { $r->{resist}->{$_} } @Jeweler::RESISTS),
               (map {
                  my $rv = $r->{stat}->{$_};
                  "(" . (ucfirst lc $_) . ($rv > 0 ? '+' : '') . $rv . ")"
               } grep { $r->{stat}->{$_} } keys %{$r->{stat}}),
               (map {
                  my $rv = $r->{spec}->{$_};
                  "(" . (lc $_) . ($rv > 0 ? '+' : '') . $rv . ")"
               } grep { $r->{spec}->{$_} } keys %{$r->{spec}})))
}

sub ring_or_ammy_to_hash {
   my ($self, $thing) = @_;

   my $obj = {};

   for (@Jeweler::RESISTS) {
      $obj->{resist}->{$_} = $thing->resistance ($_);
   }

   my $stats = $thing->stats;

   for (qw/Str Dex Con Wis Cha Int Pow/) {
      $obj->{stat}->{lc $_} = $stats->$_;
   }

   $obj->{spec}{regen} = $stats->hp;
   $obj->{spec}{magic} = $stats->sp;
   $obj->{spec}{wc}    = $stats->wc;
   $obj->{spec}{dam}   = $stats->dam;
   $obj->{spec}{ac}    = $stats->ac;
   $obj->{spec}{speed} = $stats->exp;
   $obj->{spec}{food}  = $stats->food;

   $obj->{name} = $thing->name;
   $obj->{arch} = $thing->arch->name;
   $obj->{face} = $thing->face;

   $self->{hash} = $obj
}

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

   my $obj = cf::object::new $self->{hash}->{arch};

   $obj->face ($self->{hash}{face});

   my $stats = $obj->stats;

   $stats->hp   ($self->{hash}{spec}{regen});
   $stats->sp   ($self->{hash}{spec}{magic});
   $stats->wc   ($self->{hash}{spec}{wc});
   $stats->dam  ($self->{hash}{spec}{dam});
   $stats->ac   ($self->{hash}{spec}{ac});
   $stats->exp  ($self->{hash}{spec}{speed});
   $stats->food ($self->{hash}{spec}{food});

   $stats->$_ ($self->{hash}{stat}{lc $_})
      for qw/Str Dex Con Wis Cha Int Pow/;

   for (@Jeweler::RESISTS) {
      $obj->resistance ($_, $self->{hash}->{resist}->{$_});
   }

   $obj->flag (cf::FLAG_IDENTIFIED, 1);

   return $obj;
}

sub stat_level {
   my ($self) = @_;
   my $stats = $self->{hash}->{stat} || {};

   my $maxlevel = Jeweler::getcfg (maxlevels => 'stat_level');
   my $maxstat  = Jeweler::getcfg (maximprovements => 'stats');

   my $stat_cnt = scalar (grep { $_ > 0 } values %$stats);
   my $stat_sum = sum (values %$stats); # also count the negative stats!
   my $level    = int (($maxlevel / $maxstat) * $stat_sum);

   ($level, $stat_cnt)
}

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

   my $resists = $self->{hash}->{resist} || {};

   my $att_res_lvl = Jeweler::getcfg (maxlevels => 'resist_level');
   my $efc_res_lvl = Jeweler::getcfg (maxlevels => 'effect_resist_level');
   my $max_att_res = Jeweler::getcfg (maximprovements => 'attack_resistances');
   my $max_efc_res = Jeweler::getcfg (maximprovements => 'effect_resistances');
   my $max_ovr_res = Jeweler::getcfg (maximprovements => 'resistances');

   my $ressum = 0;
   my $rescnt = 0;
   my @reslevels;

   for my $resnam (keys %$resists) {
      my $res = $resists->{$resnam};

      $rescnt++
         if $res > 0;     # negative resistancies are not an improvement

      $ressum += $res;    # note: negative resistancies lower the sum

      next unless $res > 0;

      my $level = 0;
      if (grep { $resnam eq $_ } @Jeweler::EFFECT_RESISTS) {
         $level = ceil (($efc_res_lvl / $max_efc_res) * $res);
      } else {
         $level = ceil (($att_res_lvl / $max_att_res) * $res);
      }
      push @reslevels, $level;
   }

   my $overall_lvl = ($att_res_lvl / $max_ovr_res) * $ressum;

   (max (@reslevels, $overall_lvl), $rescnt);
}

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

   my $specials = $self->{hash}->{spec} || {};

   my $max_spc_lvl  = Jeweler::getcfg (maxlevels => 'spec_level');
   my $max_specials = Jeweler::getcfg (maximprovements => 'specials');

   my @speclvls;
   my $specsum = 0;
   my $imprs = 0;

   for my $spcnam (keys %$specials) {
      my $spc = $specials->{$spcnam};
      next unless $spc > 0;

      $specsum += $spc;
      $imprs++;

      my $max_spc = Jeweler::getcfg (maxspecial => $spcnam);

      my $lvl = ($max_spc_lvl / $max_spc) * $spc;
      push @speclvls, $lvl;
   }

   my $sumlvl = ($max_spc_lvl / $max_specials) * $specsum;

   (max (@speclvls, $sumlvl), $imprs)
}


# this function calculated the 'level' of an amulet or a ring
sub power_to_level {
   my ($self, $lvldescr) = @_;

   my $max_imprs    = Jeweler::getcfg (maximprovements => 'improvements');
   my $max_impr_lvl = Jeweler::getcfg (maxlevels       => 'improve_level');

   my ($stat_lvl,   $stat_imprs) = $self->stat_level;
   my ($resist_lvl, $res_imprs)  = $self->resist_level;
   my ($spec_lvl,   $spec_imprs) = $self->special_level;

   my $impr_sum = $stat_imprs + $res_imprs + $spec_imprs;

   my $impr_lvl = ceil (($max_impr_lvl / ($max_imprs + 1)) * ($impr_sum - 1)); # 1 improvemnt bonus

   my $levl = int max ($stat_lvl, $resist_lvl, $impr_lvl, $spec_lvl, 0);

   if ($lvldescr) {
      $$lvldescr =
         sprintf "%3d: %s\n", $levl,
              "stat: $stat_lvl, resist: $resist_lvl, improve: $impr_lvl, "
             ."spec: $spec_lvl (num impr $stat_imprs + $res_imprs + $spec_imprs - 1)";
   }

   $levl
}

sub add_stat_costs {
   my ($self, $cost) = @_;

   my $stats = $self->{hash}->{stat};

   for my $stat (keys %$stats) {
      my $sum = $stats->{$stat};

      next unless $sum > 0;

      my $statfx = fx ($sum, 'stat_potions');
      $cost->{"stat_$stat"} += $statfx->[0];
      split_diamonds ($cost, $statfx->[1], 'stat_' . $stat);
   }
}

sub add_special_costs {
   my ($self, $cost) = @_;

   my $specials = $self->{hash}->{spec};

   for my $spec (keys %$specials) {
      my $sum = $specials->{$spec};

      next unless $sum > 0;

      my $specfx = fx ($sum, 'spec_potions');
      $cost->{"spec_$spec"} += $specfx->[0];
      split_diamonds ($cost, $specfx->[1], 'spec_' . $spec);
   }
}

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

   my $costs = {};

   my $ring = $self->{hash};

   for my $resnam (keys %{$ring->{resist} || {}}) {

      my $res = $ring->{resist}->{$resnam};

      next unless $res > 0;

      $costs->{"resist_" . $Jeweler::RESMAP{$resnam} . "_item"} += $res;

      my $diamonds;
      if (grep { $resnam eq $_ } @Jeweler::EFFECT_RESISTS) {
         $diamonds += fx ($res, 'effect_resist_diamonds');
      } else {
         $diamonds += fx ($res, 'attack_resist_diamonds');
      }

      split_diamonds ($costs, $diamonds, 'resist_' . $Jeweler::RESMAP{$resnam});
   }

   $self->add_stat_costs ($costs);
   $self->add_special_costs ($costs);

   return $costs;
}

sub split_diamonds {
   my ($cost, $diamonds, $category) = @_;

   my $stat_split = Jeweler::getcfg (diamond_split => $category);

   my $sum = sum (@$stat_split);
   if ($sum < (1 - 0.0001)) {
      warn "JEWELER BUG: sum (@$stat_split) = $sum < 1 for $category!";
   }

   my $emarch = cf::arch::find 'emerald';
   my $saarch = cf::arch::find 'sapphire';
   my $pearch = cf::arch::find 'pearl';
   my $ruarch = cf::arch::find 'ruby';
   my $diarch = cf::arch::find 'gem';

   my $sumvalue = $diarch->clone->value * $diamonds;

   $cost->{emerald}  += ceil $sumvalue * $stat_split->[0] / max 1, $emarch->clone->value;
   $cost->{sapphire} += ceil $sumvalue * $stat_split->[1] / max 1, $saarch->clone->value;
   $cost->{pearl}    += ceil $sumvalue * $stat_split->[2] / max 1, $pearch->clone->value;
   $cost->{ruby}     += ceil $sumvalue * $stat_split->[3] / max 1, $ruarch->clone->value;
   $cost->{gem}      += ceil $sumvalue * $stat_split->[4] / max 1, $diarch->clone->value;
}

package Jeweler::Util;

use strict;

=head2 Util

Some utility functions for the Jeweler skill.

=over 4

=item remove ($object[, $nrof])

Removes the C<$object>. If C<$nrof> is given, remove only C<$nrof> objects.
The returnvalue is the number of 'single' objects that couldn't be removed.

=cut

sub remove {
   my ($obj, $nrof) = @_;

   my $cnt;

   if (defined $nrof) {
      return 0 if ($nrof * 1) == 0;
      $cnt = int (($obj->nrof || 1) - (1 * $nrof));

      if ($cnt > 0) {
         $obj->nrof ($cnt);
         return 0;
      }
   }

   remove ($_) for $obj->inv;
   $obj->destroy;
   return $cnt;
}

sub grep_for_match {
   my ($thing, @matchar) = @_;

   my $i = 0;
   for my $match (@matchar) {
      if ($match =~ m/^\s*$/) {
         $i++;
         next;
      }

      if ($i % 3 == 0) {
         $thing->name eq $match
            and return 1;
      } elsif ($i % 3 == 1) {
         $thing->title eq $match
            and return 1;
      } else { # $i % 3 == 2
         $thing->arch->name eq $match
            and return 1;
      }
      $i++;
   }
   return 0;
}

=back

=back

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