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

use Getopt::Long;
use List::Util 'max', 'sum0';

use Games::SMTNocturne::Demons;

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

my $command = shift @ARGV;

my ($max_level, $deathstones, $kagutsuchi, $bosses);
GetOptions(
    "max_level=i"   => \$max_level,
    "deathstones=i" => \$deathstones,
    "kagutsuchi=i"  => \$kagutsuchi,
    "boss=s@"       => \$bosses,
) or die "couldn't parse options";
$bosses = [ split(/,/, join(',', @$bosses)) ]
    if $bosses;

my $options = {
    max_level  => $max_level,
    deathstone => $deathstones,
    kagutsuchi => $kagutsuchi,
    bosses     => $bosses,
};

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

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

sub demons_of_type {
    my ($type) = @_;
    print join("\n", _demons_of_type($type)), "\n";
}

sub all_demons {
    print join("\n", _all_demons), "\n";
}

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

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

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

    my @fusions = _fusions_for($demon, $options);
    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
        },
        {
            map { $_ => _demon($_) } @demons
        },
        $deathstones,
        map { _demon($_) } @demons
    );
    my @found =
        sort { $a->level <=> $b->level }
            map { _demon($_) }
                keys %$seen;
    for my $demon (@found) {
        my $path = $seen->{$demon->name};
        if (ref($path) eq 'ARRAY') {
            print "$demon:\n";
            my ($fusion, $current) = @$path;
            print "  $_\n" for _linearize_tree($current, $fusion);
        }
        else {
            print "$demon\n";
        }
    }
}
my $SEEN = {};
sub _party_fusion_recursive_fuse {
    my ($seen, $current, $deathstones, @demons) = @_;

    return $seen if $SEEN->{join(';', @demons, ($deathstones || ''))}++;

    if (@demons > 1) {
        for my $demon1 (@demons) {
            for my $demon2 (grep { $_ ne $demon1 } @demons) {
                if ($deathstones) {
                    for my $phase (0..8) {
                        _check_fusion(
                            $seen, $current, \@demons,
                            $demon1, $demon2, undef,
                            $deathstones, $phase
                        );
                    }
                }
                else {
                    _check_fusion($seen, $current, \@demons, $demon1, $demon2);
                }
                for my $demon3 (grep { $_ ne $demon1 && $_ ne $demon2 } @demons) {
                    _check_fusion(
                        $seen, $current, \@demons, $demon1, $demon2, $demon3
                    );
                }
            }
        }
    }

    return $seen;
}
sub _check_fusion {
    my ($seen, $current, $party, $demon1, $demon2, $sacrifice, $deathstones, $phase) = @_;

    my $fused = _fuse(
        $demon1, $demon2,
        {
            %$options,
            sacrifice => $sacrifice,
            deathstone => $deathstones,
            kagutsuchi => $phase,
        },
    );
    return unless $fused;
    return if defined $max_level && $fused->level > $max_level;

    my $new_current = { %$current };

    my $new_fusion = Games::SMTNocturne::Demons::Fusion->new(
        $options,
        $demon1, $demon2,
        ($sacrifice
            ? ($sacrifice)
            : ()),
        ($fused->type eq 'Fiend'
            ? ('<deathstone>', [$phase])
            : ()),
    );
    if (my $old_fusion = $new_current->{$fused->name}) {
        my $old_max_level = _max_level($new_current, $old_fusion);
        my $new_max_level = _max_level($new_current, $new_fusion);
        if ($new_max_level < $old_max_level) {
            $new_current->{$fused->name} = $new_fusion;
        }
        else {
            my $old_demon_count = _demon_count($new_current, $old_fusion);
            my $new_demon_count = _demon_count($new_current, $new_fusion);
            if ($new_demon_count < $old_demon_count) {
                $new_current->{$fused->name} = $new_fusion;
            }
        }
    }
    else {
        $new_current->{$fused->name} = $new_fusion;
    }
    if (my $old = $seen->{$fused->name}) {
        my ($old_fusion, $old_current) = ref($old) eq 'ARRAY'
            ? @$old : ($old, undef);
        my $old_max_level = _max_level($old_current, $old_fusion);
        my $new_max_level = _max_level($new_current, $new_fusion);
        if ($new_max_level < $old_max_level) {
            $seen->{$fused->name} = [ $new_fusion, $new_current ];
        }
        else {
            my $old_demon_count = _demon_count($old_current, $old_fusion);
            my $new_demon_count = _demon_count($new_current, $new_fusion);
            if ($new_demon_count < $old_demon_count) {
                $seen->{$fused->name} = [ $new_fusion, $new_current ];
            }
        }
    }
    else {
        $seen->{$fused->name} = [ $new_fusion, $new_current ];
    }

    my @new_party = (
        $fused,
        grep {
            $_ ne $demon1 && $_ ne $demon2 && (!$sacrifice || $_ ne $sacrifice)
        } @$party
    );
    _party_fusion_recursive_fuse(
        $seen, $new_current,
        ($fused->type eq 'Fiend' ? $deathstones - 1 : $deathstones),
        @new_party
    );
}
sub _max_level {
    my ($seen, $fusion) = @_;

    return 0 if $fusion->isa('Games::SMTNocturne::Demons::Demon');
    return 1 + max(
        map { _max_level($seen, $seen->{$_->name}) } $fusion->all_demons
    );
}
sub _demon_count {
    my ($seen, $fusion) = @_;

    return 1 if $fusion->isa('Games::SMTNocturne::Demons::Demon');
    my @demons = $fusion->all_demons;
    return @demons + sum0(
        map { _demon_count($seen, $seen->{$_->name}) } @demons
    );
}
sub _linearize_tree {
    my ($seen, $fusion) = @_;

    return if $fusion->isa('Games::SMTNocturne::Demons::Demon');
    return (
        (map { _linearize_tree($seen, $seen->{$_->name}) } $fusion->all_demons),
        $fusion,
    );
}