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| #!/usr/bin/env perl
use v5.36;
package Subject {
use Moo::Role;
has observers => (
is => 'ro',
default => sub { [] },
);
sub attach($self, $observer) {
push $self->observers->@*, $observer;
}
sub detach($self, $observer) {
$self->observers->@* = grep { $_ ne $observer } $self->observers->@*;
}
sub notify($self, $event, $data = {}) {
for my $observer ($self->observers->@*) {
$observer->update($event, $data);
}
}
}
package Observer {
use Moo::Role;
requires 'update';
}
package Command {
use Moo::Role;
requires 'execute';
has actor => (
is => 'ro',
required => 1,
);
has target => (
is => 'ro',
required => 0,
);
has battle => (
is => 'ro',
required => 0,
);
}
package Character {
use Moo;
has name => (
is => 'ro',
required => 1,
);
has hp => (
is => 'rw',
default => 100,
);
has max_hp => (
is => 'ro',
default => 100,
);
has attack_power => (
is => 'ro',
default => 10,
);
has is_defending => (
is => 'rw',
default => 0,
);
sub is_alive($self) {
return $self->hp > 0;
}
sub take_damage($self, $damage) {
my $actual_damage = $self->is_defending ? int($damage / 2) : $damage;
my $new_hp = $self->hp - $actual_damage;
$self->hp($new_hp < 0 ? 0 : $new_hp);
$self->is_defending(0);
return $actual_damage;
}
}
package AttackCommand {
use Moo;
with 'Command';
sub execute($self) {
my $actor = $self->actor;
my $target = $self->target;
my $damage = $actor->attack_power;
my $actual = $target->take_damage($damage);
my $msg = $actor->name . "の攻撃！ " . $target->name . "に " . $actual . " のダメージ！";
$msg .= "（防御で軽減）" if $actual < $damage;
say $msg;
if ($self->battle) {
$self->battle->notify('damage_taken', {
target => $target,
damage => $actual,
message => $msg,
});
}
}
}
package DefendCommand {
use Moo;
with 'Command';
sub execute($self) {
my $actor = $self->actor;
$actor->is_defending(1);
say $actor->name . "は防御の構えをとった！";
}
}
package ItemCommand {
use Moo;
with 'Command';
has item_name => (
is => 'ro',
default => 'ポーション',
);
has heal_amount => (
is => 'ro',
default => 30,
);
sub execute($self) {
my $actor = $self->actor;
my $max_hp = $actor->max_hp;
my $old_hp = $actor->hp;
my $new_hp = $old_hp + $self->heal_amount;
$actor->hp($new_hp > $max_hp ? $max_hp : $new_hp);
my $actual_heal = $actor->hp - $old_hp;
say $actor->name . "は" . $self->item_name . "を使った！ HPが " . $actual_heal . " 回復！";
if ($self->battle) {
$self->battle->notify('heal_received', {
target => $actor,
amount => $actual_heal,
});
}
}
}
package BattleLogger {
use Moo;
with 'Observer';
has logs => (
is => 'ro',
default => sub { [] },
);
sub update($self, $event, $data) {
my $message = $data->{message} // '';
push $self->logs->@*, "[$event] $message";
}
sub dump_logs($self) {
say "=== 戦闘ログ（" . scalar($self->logs->@*) . "件）===";
say $_ for $self->logs->@*;
}
}
package DamageEffect {
use Moo;
with 'Observer';
sub update($self, $event, $data) {
return unless $event eq 'damage_taken';
my $target = $data->{target};
my $hp_ratio = $target->hp / $target->max_hp;
if ($hp_ratio <= 0 ) {
say " ★★★ " . $target->name . "は倒れた！ ★★★";
} elsif ($hp_ratio <= 0.25) {
say " ★ " . $target->name . "は瀕死だ！";
} elsif ($hp_ratio <= 0.5) {
say " ※ " . $target->name . "のHPが半分以下！";
}
}
}
package BattleReward {
use Moo;
with 'Observer';
sub update($self, $event, $data) {
return unless $event eq 'battle_end';
return unless $data->{winner} eq 'player';
my $exp = int(rand(50)) + 10;
my $gold = int(rand(30)) + 5;
say "";
say " " . $exp . " の経験値を獲得！ ";
say " " . $gold . " ゴールドを獲得！ ";
}
}
package BattleContext {
use Moo;
with 'Subject';
has player => (
is => 'ro',
required => 1,
);
has enemy => (
is => 'ro',
required => 1,
);
has is_finished => (
is => 'rw',
default => 0,
);
}
# メイン処理
my $hero = Character->new(
name => '勇者',
hp => 100,
max_hp => 100,
attack_power => 15,
);
my $slime = Character->new(
name => 'スライム',
hp => 40,
max_hp => 40,
attack_power => 8,
);
my $battle = BattleContext->new(
player => $hero,
enemy => $slime,
);
# Observerを登録
my $logger = BattleLogger->new();
my $damage_effect = DamageEffect->new();
my $reward = BattleReward->new();
$battle->attach($logger);
$battle->attach($damage_effect);
$battle->attach($reward);
# 戦闘開始
say "=== 戦闘開始！ ===";
$battle->notify('battle_start', { message => '戦闘開始' });
say $hero->name . " HP: " . $hero->hp . " vs " . $slime->name . " HP: " . $slime->hp;
say "";
# 戦闘ループ
my $turn = 0;
while ($hero->is_alive && $slime->is_alive) {
$turn++;
say "--- ターン $turn ---";
# プレイヤーターン
AttackCommand->new(actor => $hero, target => $slime, battle => $battle)->execute();
last unless $slime->is_alive;
# 敵ターン
AttackCommand->new(actor => $slime, target => $hero, battle => $battle)->execute();
}
# 戦闘終了
say "";
say "=== 戦闘終了！ ===";
my $winner = $hero->is_alive ? 'player' : 'enemy';
$battle->notify('battle_end', { winner => $winner, message => '戦闘終了' });
if ($winner eq 'player') {
say $slime->name . "を倒した！";
} else {
say $hero->name . "は倒れた...";
}
# ログを出力
say "";
$logger->dump_logs();
|
