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#!/usr/bin/env perl
use strict;
use warnings;

use List::Util 'max';

use Games::SMTNocturne::Demons;

sub _demon       { Games::SMTNocturne::Demons::demon(@_) }
sub _fuse        { Games::SMTNocturne::Demons::fuse(@_) }
sub _fusions_for { Games::SMTNocturne::Demons::fusions_for(@_) }

my $command = shift @ARGV;

if ($command !~ /^_/ && defined &$command) {
    { no strict 'refs'; &{ $command }(@ARGV) }
}
else {
    die "unknown command $command";
}

sub demon {
    my ($demon) = @_;
    print _demon($demon), "\n";
}

sub fuse {
    my ($demon1, $demon2) = @_;
    print _fuse($demon1, $demon2), "\n";
}

sub fusions_for {
    my ($demon) = @_;
    print join("\n", _fusions_for($demon)), "\n";
}

sub min_level_for {
    my ($demon) = @_;

    my @fusions = _fusions_for($demon);
    my $min_level = 99;
    my @min_level_fusions;
    for my $fusion (@fusions) {
        my $max_level = max(map { $_->level } $fusion->all_demons);
        if ($max_level < $min_level) {
            @min_level_fusions = ($fusion);
            $min_level = $max_level;
        }
        elsif ($max_level == $min_level) {
            push @min_level_fusions, $fusion;
        }
    }
    print "Level $min_level:\n";
    print join("\n", @min_level_fusions), "\n";
}

sub party_fusion {
    my @demons = @_;
    my $seen = _party_fusion_recursive_fuse({}, map { _demon($_) } @demons);
    print join("\n", map { _demon($_) } sort { $a cmp $b } keys %$seen), "\n";
}
sub _party_fusion_recursive_fuse {
    my ($seen, @demons) = @_;

    $seen->{$_} = 1 for map { $_->name } @demons;

    if (@demons > 1) {
        for my $demon1 (@demons) {
            for my $demon2 (grep { $_ ne $demon1 } @demons) {
                my $fused = _fuse($demon1, $demon2);
                next unless $fused;
                my @new_party = (
                    $fused, grep { $_ ne $demon1 && $_ ne $demon2 } @demons
                );
                _party_fusion_recursive_fuse($seen, @new_party);
            }
        }
    }

    return $seen;
}