refactor a bunch of the level calculations

6 files changed, 43 insertions, 25 deletions

diff --git a/lib/Games/SMTNocturne/Fusion/Chart.pm b/lib/Games/SMTNocturne/Fusion/Chart.pm
index 1570e97..c3e7c5c 100644
--- a/lib/Games/SMTNocturne/Fusion/Chart.pm
+++ b/lib/Games/SMTNocturne/Fusion/Chart.pm
@@ -49,16 +49,10 @@ my %element_fusions = (
 
 multi method fuse (ClassName $self: SMTDemon $demon1 is coerce,
                                     SMTDemon $demon2 is coerce) {
-    my $type = $self->_type_chart->{$demon1->type}{$demon2->type};
-    my $level = ($demon1->level + $demon2->level) / 2;
-    my @possible = Demon->lookup(
-        type  => $type,
-        level => sub { $_ >= $level },
+    return Demon->next_demon_above_level(
+        $self->_type_chart->{$demon1->type}{$demon2->type},
+        ($demon1->level + $demon2->level) / 2,
     );
-    return firstval { !$_->does('Games::SMTNocturne::Fusion::Role::Deathstone')
-                   && !$_->does('Games::SMTNocturne::Fusion::Role::Evolve')
-                   && !$_->does('Games::SMTNocturne::Fusion::Role::Special') }
-                    @possible;
 }
 
 multi method fuse (ClassName $self: Element $demon1 is coerce,
diff --git a/lib/Games/SMTNocturne/Fusion/Demon.pm b/lib/Games/SMTNocturne/Fusion/Demon.pm
index dbf323c..e4d6cf1 100644
--- a/lib/Games/SMTNocturne/Fusion/Demon.pm
+++ b/lib/Games/SMTNocturne/Fusion/Demon.pm
@@ -112,28 +112,44 @@ sub lookup {
     return wantarray ? @possible : (@possible == 1 ? $possible[0] : undef);
 }
 
-sub level_up {
+sub fusion_possibility {
     my $self = shift;
-    my @possible = $self->lookup(
-        type  => $self->type,
-        level => sub { $_ > $self->level },
+    return
+        if $self->does('Games::SMTNocturne::Fusion::Role::NotNormallyFusable');
+    # XXX: should have a way to specify which bosses we've beaten so far
+    return
+        if $self->does('Games::SMTNocturne::Fusion::Role::Boss');
+    return 1;
+}
+
+sub next_demon_above_level {
+    my $class = shift;
+    my ($type, $level) = @_;
+    my @possible = $class->lookup(
+        type  => $type,
+        level => sub { $_ >= $level },
+    );
+    return firstval { $_->fusion_possibility } @possible;
+}
+
+sub next_demon_below_level {
+    my $class = shift;
+    my ($type, $level) = @_;
+    my @possible = $class->lookup(
+        type  => $type,
+        level => sub { $_ <= $level },
     );
-    return firstval { !$_->does('Games::SMTNocturne::Fusion::Role::Deathstone')
-                   && !$_->does('Games::SMTNocturne::Fusion::Role::Evolve')
-                   && !$_->does('Games::SMTNocturne::Fusion::Role::Special') }
-                    @possible;
+    return lastval { $_->fusion_possibility } @possible;
+}
+
+sub level_up {
+    my $self = shift;
+    return $self->next_demon_above_level($self->type, $self->level + 1);
 }
 
 sub level_down {
     my $self = shift;
-    my @possible = $self->lookup(
-        type  => $self->type,
-        level => sub { $_ < $self->level },
-    );
-    return lastval { !$_->does('Games::SMTNocturne::Fusion::Role::Deathstone')
-                  && !$_->does('Games::SMTNocturne::Fusion::Role::Evolve')
-                  && !$_->does('Games::SMTNocturne::Fusion::Role::Special') }
-                   @possible;
+    return $self->next_demon_below_level($self->type, $self->level - 1);
 }
 
 __PACKAGE__->meta->make_immutable;
diff --git a/lib/Games/SMTNocturne/Fusion/Role/Deathstone.pm b/lib/Games/SMTNocturne/Fusion/Role/Deathstone.pm
index aa5cb19..01a1745 100644
--- a/lib/Games/SMTNocturne/Fusion/Role/Deathstone.pm
+++ b/lib/Games/SMTNocturne/Fusion/Role/Deathstone.pm
@@ -1,5 +1,6 @@
 package Games::SMTNocturne::Fusion::Role::Deathstone;
 use Moose::Role;
 use namespace::autoclean;
+with 'Games::SMTNocturne::Fusion::Role::NotNormallyFusable';
 
 1;
diff --git a/lib/Games/SMTNocturne/Fusion/Role/Evolve.pm b/lib/Games/SMTNocturne/Fusion/Role/Evolve.pm
index f2a8847..addf4cd 100644
--- a/lib/Games/SMTNocturne/Fusion/Role/Evolve.pm
+++ b/lib/Games/SMTNocturne/Fusion/Role/Evolve.pm
@@ -1,5 +1,6 @@
 package Games::SMTNocturne::Fusion::Role::Evolve;
 use Moose::Role;
 use namespace::autoclean;
+with 'Games::SMTNocturne::Fusion::Role::NotNormallyFusable';
 
 1;
diff --git a/lib/Games/SMTNocturne/Fusion/Role/NotNormallyFusable.pm b/lib/Games/SMTNocturne/Fusion/Role/NotNormallyFusable.pm
new file mode 100644
index 0000000..508c43d
--- /dev/null
+++ b/lib/Games/SMTNocturne/Fusion/Role/NotNormallyFusable.pm
@@ -0,0 +1,5 @@
+package Games::SMTNocturne::Fusion::Role::NotNormallyFusable;
+use Moose::Role;
+use namespace::autoclean;
+
+1;
diff --git a/lib/Games/SMTNocturne/Fusion/Role/Special.pm b/lib/Games/SMTNocturne/Fusion/Role/Special.pm
index afb4dfe..6d943c7 100644
--- a/lib/Games/SMTNocturne/Fusion/Role/Special.pm
+++ b/lib/Games/SMTNocturne/Fusion/Role/Special.pm
@@ -1,5 +1,6 @@
 package Games::SMTNocturne::Fusion::Role::Special;
 use Moose::Role;
 use namespace::autoclean;
+with 'Games::SMTNocturne::Fusion::Role::NotNormallyFusable';
 
 1;