<?php
declare(strict_types=1);
namespace App\Tests;

use App\Alert\{AlertDispatcher, EscalationWatch, Channels};
use App\Tests\Support\{InMemoryEventRepository, InMemoryAlertRepository, InMemorySuppressionRepository};
use PHPUnit\Framework\TestCase;

/**
 * The notification path — the piece whose absence meant a fall at 03:00 produced a database row
 * and nothing else. These tests pin the rules that decide whether a human is actually reached.
 */
final class AlertDispatchTest extends TestCase
{
    private const NOW = 1_800_000_000;

    private function channel(array $over = []): array
    {
        return $over + [
            'channel_id' => 1, 'site' => null, 'kind' => 'email', 'name' => 'shift lead',
            'config_json' => '{"to":["a@b.c"]}', 'min_severity' => 'high',
            'enabled' => 1, 'step' => 0, 'escalate_after_s' => 0,
        ];
    }

    private function event(array $over = []): array
    {
        return $over + [
            'event_id' => 1, 'device_id' => 'pi-1', 'site' => null, 'camera_id' => 'cam-1',
            'event_type' => 'fall', 'severity' => 'critical', 'zone_id' => null,
            'occurred_at' => (float)(self::NOW - 10), 'duration_s' => 1.0,
            'acknowledged_by' => null, 'false_positive_by' => null,
        ];
    }

    private function dispatcher(
        ?InMemoryEventRepository $ev = null, ?InMemoryAlertRepository $al = null,
        ?InMemorySuppressionRepository $su = null
    ): AlertDispatcher {
        return new AlertDispatcher($ev ?? new InMemoryEventRepository(),
                                   $al ?? new InMemoryAlertRepository(),
                                   $su ?? new InMemorySuppressionRepository());
    }

    // ---- 심각도 문턱 ------------------------------------------------------------

    public function testSeverityFloorIsAFloorNotAnEquality(): void
    {
        $d = $this->dispatcher();
        // critical >= high 이므로 발송 대상이다. 예전 구현이 동등 비교였다면 넘어짐이 조용히 빠진다.
        $this->assertCount(1, $d->planFor($this->event(['severity' => 'critical']), [$this->channel()], self::NOW));
        $this->assertCount(0, $d->planFor($this->event(['severity' => 'warning']), [$this->channel()], self::NOW));
    }

    public function testDisabledChannelNeverFires(): void
    {
        $d = $this->dispatcher();
        $this->assertCount(0, $d->planFor($this->event(), [$this->channel(['enabled' => 0])], self::NOW));
    }

    public function testLocalChannelsAreNotServerDelivered(): void
    {
        // 엣지가 자체 GPIO 로 울린다. 서버가 원장에 잡으면 영구 실패로 남는다.
        $d = $this->dispatcher();
        $this->assertCount(0, $d->planFor($this->event(), [$this->channel(['kind' => 'local'])], self::NOW));
    }

    // ---- 해소된 이벤트 ----------------------------------------------------------

    public function testAcknowledgedEventStopsTheChain(): void
    {
        $d = $this->dispatcher();
        $this->assertCount(0, $d->planFor($this->event(['acknowledged_by' => 'op']), [$this->channel()], self::NOW));
    }

    public function testFalsePositiveStopsTheChain(): void
    {
        $d = $this->dispatcher();
        $this->assertCount(0, $d->planFor($this->event(['false_positive_by' => 'op']), [$this->channel()], self::NOW));
    }

    // ---- 에스컬레이션 타이밍 ----------------------------------------------------

    public function testEscalationChannelWaitsForItsDelay(): void
    {
        $d = $this->dispatcher();
        $ch = $this->channel(['channel_id' => 2, 'step' => 1, 'escalate_after_s' => 300]);
        $young = $this->event(['occurred_at' => (float)(self::NOW - 60)]);
        $old = $this->event(['occurred_at' => (float)(self::NOW - 600)]);
        $this->assertCount(0, $d->planFor($young, [$ch], self::NOW), '아직 이르다');
        $this->assertCount(1, $d->planFor($old, [$ch], self::NOW), '지연 경과 후 발화');
    }

    // ---- 사이트 스코프 ----------------------------------------------------------

    public function testSiteScopedChannelOnlyServesItsOwnSite(): void
    {
        $d = $this->dispatcher();
        $ch = $this->channel(['site' => 'factory-a']);
        $this->assertCount(1, $d->planFor($this->event(['site' => 'factory-a']), [$ch], self::NOW));
        $this->assertCount(0, $d->planFor($this->event(['site' => 'factory-b']), [$ch], self::NOW));
        // site 가 NULL 인 채널은 전역 (단일 현장 기본 설치).
        $this->assertCount(1, $d->planFor($this->event(['site' => 'factory-b']), [$this->channel()], self::NOW));
    }

    // ---- 억제 ------------------------------------------------------------------

    public function testSuppressionWithholdsSendButStillRecordsIt(): void
    {
        $events = new InMemoryEventRepository();
        $id = $events->insert(['device_id' => 'pi-1', 'camera_id' => 'cam-1', 'event_type' => 'zone_restricted',
            'severity' => 'high', 'occurred_at' => (float)(self::NOW - 10), 'metrics' => []]);
        $alerts = new InMemoryAlertRepository([$this->channel()]);
        $sup = new InMemorySuppressionRepository();
        $sup->create(['scope_type' => 'camera', 'scope_id' => 'cam-1', 'site' => null,
                      'reason' => '정비', 'starts_at' => self::NOW - 60, 'ends_at' => self::NOW + 600,
                      'created_by' => 'op', 'created_at' => self::NOW - 60]);

        $sent = 0;
        $stats = $this->dispatcher($events, $alerts, $sup)
                      ->run(self::NOW, 3600, 100, function () use (&$sent) { $sent++; });

        $this->assertSame(0, $sent, '억제 중에는 실제 발송이 없다');
        $this->assertSame(1, $stats['suppressed']);
        // 그러나 원장에는 남는다 — 조사에서 "경보가 났지만 의도적으로 보류됐다"를 볼 수 있어야 한다.
        $log = $alerts->forEvent($id);
        $this->assertCount(1, $log);
        $this->assertSame('suppressed', $log[0]['status']);
    }

    // ---- 중복 발송 방지 ---------------------------------------------------------

    public function testSecondRunDoesNotResendTheSameEvent(): void
    {
        $events = new InMemoryEventRepository();
        $events->insert(['device_id' => 'pi-1', 'camera_id' => 'cam-1', 'event_type' => 'fall',
            'severity' => 'critical', 'occurred_at' => (float)(self::NOW - 10), 'metrics' => []]);
        $alerts = new InMemoryAlertRepository([$this->channel()]);
        $d = $this->dispatcher($events, $alerts);

        $sent = 0;
        $send = function () use (&$sent) { $sent++; };
        $d->run(self::NOW, 3600, 100, $send);
        $d->run(self::NOW, 3600, 100, $send);      // 크론 중첩 실행을 흉내낸다

        $this->assertSame(1, $sent, '같은 사건을 두 번 전화하지 않는다');
    }

    public function testOneFailingChannelDoesNotStopTheOthers(): void
    {
        $events = new InMemoryEventRepository();
        $events->insert(['device_id' => 'pi-1', 'camera_id' => 'cam-1', 'event_type' => 'fall',
            'severity' => 'critical', 'occurred_at' => (float)(self::NOW - 10), 'metrics' => []]);
        $alerts = new InMemoryAlertRepository([
            $this->channel(['channel_id' => 1, 'name' => 'broken']),
            $this->channel(['channel_id' => 2, 'name' => 'works']),
        ]);
        $ok = 0;
        $stats = $this->dispatcher($events, $alerts)->run(self::NOW, 3600, 100,
            function (array $e, array $ch) use (&$ok) {
                if ($ch['name'] === 'broken') throw new \RuntimeException('relay down');
                $ok++;
            });
        $this->assertSame(1, $ok, '불통 채널 하나가 나머지를 막지 않는다');
        $this->assertSame(1, $stats['failed']);
        $this->assertSame(1, $stats['sent']);
    }

    // ---- 미확인 에스컬레이션 ----------------------------------------------------

    public function testUnackedCriticalBecomesItsOwnEvent(): void
    {
        $events = new InMemoryEventRepository();
        $origin = $events->insert(['device_id' => 'pi-1', 'camera_id' => 'cam-1', 'event_type' => 'fall',
            'severity' => 'critical', 'occurred_at' => (float)(self::NOW - 600), 'metrics' => []]);
        $watch = new EscalationWatch($events);

        $this->assertSame([$origin], $watch->run(self::NOW, 300, 3600, 100));
        $escalations = array_values(array_filter($events->rows,
            fn ($r) => ($r['event_type'] ?? '') === 'unacked_escalation'));
        $this->assertCount(1, $escalations);
        $this->assertSame('critical', $escalations[0]['severity'], '심각도를 낮추면 상위 채널 문턱을 못 넘는다');
        $this->assertSame($origin, $escalations[0]['metrics']['origin_event_id']);
    }

    public function testEscalationIsIdempotent(): void
    {
        $events = new InMemoryEventRepository();
        $events->insert(['device_id' => 'pi-1', 'camera_id' => 'cam-1', 'event_type' => 'fall',
            'severity' => 'critical', 'occurred_at' => (float)(self::NOW - 600), 'metrics' => []]);
        $watch = new EscalationWatch($events);
        $watch->run(self::NOW, 300, 3600, 100);
        $this->assertSame([], $watch->run(self::NOW, 300, 3600, 100), '두 번째 실행은 아무것도 만들지 않는다');
    }

    public function testAcknowledgedEventNeverEscalates(): void
    {
        $events = new InMemoryEventRepository();
        $id = $events->insert(['device_id' => 'pi-1', 'camera_id' => 'cam-1', 'event_type' => 'fall',
            'severity' => 'critical', 'occurred_at' => (float)(self::NOW - 600), 'metrics' => []]);
        $events->acknowledge($id, 'op');
        $this->assertSame([], (new EscalationWatch($events))->run(self::NOW, 300, 3600, 100));
    }

    public function testEscalationDoesNotEscalateItself(): void
    {
        $events = new InMemoryEventRepository();
        $events->insert(['device_id' => 'pi-1', 'camera_id' => 'cam-1', 'event_type' => 'unacked_escalation',
            'severity' => 'critical', 'occurred_at' => (float)(self::NOW - 600), 'metrics' => []]);
        $this->assertSame([], (new EscalationWatch($events))->run(self::NOW, 300, 3600, 100),
            '무한 사다리 방지');
    }

    public function testWarningNeverEscalates(): void
    {
        $events = new InMemoryEventRepository();
        $events->insert(['device_id' => 'pi-1', 'camera_id' => 'cam-1', 'event_type' => 'zone_warning',
            'severity' => 'warning', 'occurred_at' => (float)(self::NOW - 6000), 'metrics' => []]);
        $this->assertSame([], (new EscalationWatch($events))->run(self::NOW, 300, 86400, 100),
            '미처리 경고는 백로그이지 응급이 아니다');
    }

    // ---- 메시지 내용 ------------------------------------------------------------

    public function testMessageCarriesNoImageAndLinksToTheIncident(): void
    {
        $c = new Channels('https://example.com/move_detect');
        $body = $c->body($this->event(['event_id' => 42]));
        $this->assertStringContainsString('https://example.com/move_detect/events/42/view', $body);
        $this->assertStringContainsString('넘어짐', $body);
        // 스냅샷은 PIPA 대상 개인정보다. 메일로 나가면 인증 프록시가 지키던 통제를 벗어난다.
        $this->assertStringNotContainsString('/snap/', $body);
        $this->assertStringContainsString('이미지가 포함되지 않습니다', $body);
    }

    // ---- 재감사(2026-08-18) 회귀 ------------------------------------------------

    public function testAlreadyDeliveredPairsAreNotReClaimedEveryRun(): void
    {
        // A7: 디스패처는 매분 창 전체를 다시 훑는다. 사전 필터가 없으면 이미 보낸
        // (event,channel) 마다 실패할 INSERT 를 한 번씩 또 시도한다 — 비용이 '새 이벤트'가
        // 아니라 '창 길이'에 비례하고, 크론이 불안정해 창을 넓힌 현장일수록 더 나빠진다.
        $events = new InMemoryEventRepository();
        $events->insert(['device_id' => 'pi-1', 'camera_id' => 'cam-1', 'event_type' => 'fall',
            'severity' => 'critical', 'occurred_at' => (float)(self::NOW - 10), 'metrics' => []]);
        $alerts = new InMemoryAlertRepository([$this->channel()]);
        $d = $this->dispatcher($events, $alerts);
        $send = function () {};

        $d->run(self::NOW, 3600, 100, $send);
        $afterFirst = $alerts->claimCalls;
        $d->run(self::NOW, 3600, 100, $send);
        $d->run(self::NOW, 3600, 100, $send);

        $this->assertSame(1, $afterFirst, '첫 실행은 한 번 claim 한다');
        $this->assertSame(1, $alerts->claimCalls,
            '이후 실행은 원장을 먼저 읽어 이미 처리된 쌍에 claim 을 시도하지 않는다');
    }

    public function testWebhookRefusesNonHttpSchemes(): void
    {
        $c = new Channels('https://example.com');
        $this->expectException(\RuntimeException::class);
        $c->send($this->event(), $this->channel(['kind' => 'webhook', 'config_json' => '{"url":"file:///etc/passwd"}']));
    }
}