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#!/usr/bin/env perl
# 言語: perl
# バージョン: 5.36以上
# 依存: Moo（cpanmでインストール）

use v5.36;

package IntrusionEvent;
use Moo;

has timestamp => (
    is       => 'ro',
    required => 1,
);

has source_ip => (
    is       => 'ro',
    required => 1,
);

has attack_type => (
    is       => 'ro',
    required => 1,
);

package IntrusionObserver;
use Moo::Role;

requires 'update';

package RadarLogObserver;
use Moo;
with 'IntrusionObserver';

sub update ($self, $event) {
    say "[ログ] " . $event->attack_type . " from " . $event->source_ip;
}

package ThreatScoreObserver;
use Moo;
with 'IntrusionObserver';

my %threat_scores = (
    'SSH Brute Force'       => 80,
    'Port Scan'             => 30,
    'SQL Injection Attempt' => 90,
);

has total_score => (
    is      => 'rw',
    default => 0,
);

sub update ($self, $event) {
    my $score = $threat_scores{$event->attack_type} // 50;
    $self->total_score($self->total_score + $score);
    say "[スコア] 累計: " . $self->total_score;
}

# 新しいObserver（追加）
package RiskLevelObserver;
use Moo;
with 'IntrusionObserver';

my %risk_levels = (
    'SSH Brute Force'       => 'HIGH',
    'Port Scan'             => 'LOW',
    'SQL Injection Attempt' => 'HIGH',
    'XSS Attack'            => 'MEDIUM',
);

sub update ($self, $event) {
    my $level = $risk_levels{$event->attack_type} // 'MEDIUM';
    my $indicator = $level eq 'HIGH'   ? '!!!'
                  : $level eq 'MEDIUM' ? '!!'
                  : '!';
    say "[$indicator リスクレベル: $level] " . $event->attack_type;
}

package IntrusionHub;
use Moo;

has observers => (
    is      => 'ro',
    default => sub { [] },
);

sub attach ($self, $observer) {
    unless ($observer->does('IntrusionObserver')) {
        die "Error: IntrusionObserverロールを実装していないオブジェクトは登録できません";
    }
    push $self->observers->@*, $observer;
}

sub detach ($self, $observer) {
    $self->observers->@* = grep { $_ != $observer } $self->observers->@*;
}

sub notify ($self, $event) {
    for my $observer ($self->observers->@*) {
        $observer->update($event);
    }
}

package main;

my $hub = IntrusionHub->new;

# 既存のObserver
$hub->attach(RadarLogObserver->new);
$hub->attach(ThreatScoreObserver->new);

# 新しいObserverを追加
$hub->attach(RiskLevelObserver->new);

my @events = (
    IntrusionEvent->new(
        timestamp   => '2026-01-18T06:00:00+09:00',
        source_ip   => '192.168.1.100',
        attack_type => 'SSH Brute Force',
    ),
    IntrusionEvent->new(
        timestamp   => '2026-01-18T06:01:15+09:00',
        source_ip   => '10.0.0.55',
        attack_type => 'Port Scan',
    ),
);

say "=== 侵入イベント処理 ===";
say "";
for my $event (@events) {
    $hub->notify($event);
    say "";
}

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=== 侵入イベント処理 ===

[ログ] SSH Brute Force from 192.168.1.100
[スコア] 累計: 80
[!!! リスクレベル: HIGH] SSH Brute Force

[ログ] Port Scan from 10.0.0.55
[スコア] 累計: 110
[! リスクレベル: LOW] Port Scan