<?php

declare(strict_types=1);

namespace Tests\Feature\Api;

use App\Enums\MissingUrlStatus;
use App\Models\MissingUrl;
use App\Models\Redirect;
use App\Support\Maintenance;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Testing\TestResponse;
use PHPUnit\Framework\Attributes\Test;
use Tests\TestCase;

/**
 * The frontend reporting what it could not resolve.
 *
 * The endpoint is small; what needs holding still is everything around it. It
 * is a write endpoint on the public API, so it is gated by a secret and can
 * never be open by accident. It is fed by strangers' traffic, so a scan must
 * not be able to turn the table into a log. And what it collects is only worth
 * collecting if it lines up exactly with what a redirect matches against.
 */
class TelemetryApiTest extends TestCase
{
    use RefreshDatabase;

    protected string $token = 'ingest-secret';

    protected function setUp(): void
    {
        parent::setUp();

        config(['site.telemetry.token' => $this->token]);

        $this->withHeaders(['Accept-Language' => 'es']);
    }

    /**
     * @param  array<string, mixed>  $payload
     */
    protected function report(array $payload): TestResponse
    {
        return $this->withHeaders(['X-Ingest-Token' => $this->token])
            ->postJson('/api/public/v1/telemetry/not-found', $payload);
    }

    #[Test]
    public function it_records_an_address_that_could_not_be_resolved(): void
    {
        $this->report([
            'path' => '/proyectos/nombre-viejo',
            'locale' => 'es',
            'referrer' => 'https://example.net/enlace',
        ])
            ->assertAccepted()
            ->assertJsonPath('data.recorded', 1)
            // A confirmation is nobody else's, and this one is not cacheable
            // for the same reason a submission's is not.
            ->assertHeader('Cache-Control', 'no-store, private');

        $this->assertDatabaseHas('missing_urls', [
            'path' => '/proyectos/nombre-viejo',
            'locale' => 'es',
            'hits' => 1,
            'referrer' => 'https://example.net/enlace',
            'status' => MissingUrlStatus::Pending->value,
        ]);
    }

    /**
     * The property that makes this a counter rather than a log: a crawler
     * walking a dead section must cost one row, not one row per request.
     */
    #[Test]
    public function reporting_the_same_address_again_counts_instead_of_repeating(): void
    {
        foreach (range(1, 3) as $ignored) {
            $this->report(['path' => '/equipo/quien-sea', 'locale' => 'es'])->assertAccepted();
        }

        $this->assertSame(1, MissingUrl::query()->count());
        $this->assertSame(3, (int) MissingUrl::query()->first()->hits);
    }

    /**
     * Paths are normalised exactly as redirects are. If these two ever
     * disagree, the list fills with addresses that already have a rule.
     */
    #[Test]
    public function it_normalises_the_path_the_way_a_redirect_does(): void
    {
        $this->report(['path' => '/proyectos/algo/', 'locale' => 'es'])->assertAccepted();
        $this->report(['path' => '/proyectos/algo?utm_source=twitter', 'locale' => 'es'])->assertAccepted();

        $this->assertSame(1, MissingUrl::query()->count());
        $this->assertSame('/proyectos/algo', MissingUrl::query()->first()->path);
    }

    #[Test]
    public function it_accepts_a_batch(): void
    {
        $this->report(['hits' => [
            ['path' => '/uno', 'locale' => 'es'],
            ['path' => '/dos', 'locale' => 'en'],
            ['path' => '/tres'],
        ]])
            ->assertAccepted()
            ->assertJsonPath('data.recorded', 3);

        $this->assertSame(3, MissingUrl::query()->count());
    }

    /**
     * The locale is half of the unique key, so it can never be null — the
     * negotiated one stands in when the frontend does not say.
     */
    #[Test]
    public function a_report_without_a_locale_falls_back_to_the_negotiated_one(): void
    {
        $this->withHeaders(['Accept-Language' => 'ca'])
            ->report(['path' => '/sense-idioma'])
            ->assertAccepted();

        $this->assertDatabaseHas('missing_urls', ['path' => '/sense-idioma', 'locale' => 'ca']);
    }

    /**
     * The same address in two languages is two problems: they are fixed by two
     * different redirects, because the paths differ per language.
     */
    #[Test]
    public function the_same_path_in_two_languages_is_two_rows(): void
    {
        $this->report(['path' => '/algo', 'locale' => 'es'])->assertAccepted();
        $this->report(['path' => '/algo', 'locale' => 'ca'])->assertAccepted();

        $this->assertSame(2, MissingUrl::query()->count());
    }

    #[Test]
    public function it_drops_scans_for_things_that_were_never_here(): void
    {
        $this->report(['hits' => [
            ['path' => '/wp-admin/setup-config.php'],
            ['path' => '/.env'],
            ['path' => '/proyectos/de-verdad'],
        ]])
            ->assertAccepted()
            ->assertJsonPath('data.received', 3)
            // Reported honestly: the frontend can tell its filter from ours.
            ->assertJsonPath('data.recorded', 1);

        $this->assertSame(1, MissingUrl::query()->count());
        $this->assertSame('/proyectos/de-verdad', MissingUrl::query()->first()->path);
    }

    /**
     * A later sighting without a referrer is what a bot produces. It must not
     * erase the referrer that told us who is linking to a dead address.
     */
    #[Test]
    public function a_later_sighting_never_erases_a_known_referrer(): void
    {
        $this->report(['path' => '/algo', 'locale' => 'es', 'referrer' => 'https://example.net/post'])
            ->assertAccepted();

        $this->report(['path' => '/algo', 'locale' => 'es'])->assertAccepted();

        $this->assertSame('https://example.net/post', MissingUrl::query()->first()->referrer);
    }

    #[Test]
    public function it_refuses_without_the_secret(): void
    {
        $this->postJson('/api/public/v1/telemetry/not-found', ['path' => '/algo'])
            ->assertForbidden();

        $this->withHeaders(['X-Ingest-Token' => 'wrong'])
            ->postJson('/api/public/v1/telemetry/not-found', ['path' => '/algo'])
            ->assertForbidden();

        $this->assertSame(0, MissingUrl::query()->count());
    }

    /**
     * The rule the preview secret already follows: an unset secret disables
     * the endpoint, it never opens it.
     */
    #[Test]
    public function an_unset_secret_grants_nobody_access(): void
    {
        config(['site.telemetry.token' => null]);

        $this->withHeaders(['X-Ingest-Token' => ''])
            ->postJson('/api/public/v1/telemetry/not-found', ['path' => '/algo'])
            ->assertForbidden();

        $this->assertSame(0, MissingUrl::query()->count());
    }

    #[Test]
    public function it_rejects_what_it_cannot_use(): void
    {
        $this->report(['path' => 'https://otro-dominio.example/algo'])
            ->assertUnprocessable()
            ->assertJsonValidationErrors('hits.0.path');

        $this->report(['hits' => []])->assertUnprocessable();

        $this->report(['path' => '/algo', 'locale' => 'de'])
            ->assertUnprocessable()
            ->assertJsonValidationErrors('hits.0.locale');
    }

    #[Test]
    public function it_caps_how_much_one_request_may_carry(): void
    {
        config(['site.telemetry.max_batch' => 2]);

        $this->report(['hits' => [
            ['path' => '/uno'], ['path' => '/dos'], ['path' => '/tres'],
        ]])->assertUnprocessable();
    }

    /**
     * Maintenance is about what visitors are shown. A 404 during it is still a
     * 404 — and it is the most likely moment to produce the interesting ones.
     */
    #[Test]
    public function it_keeps_listening_while_the_site_is_down_for_maintenance(): void
    {
        app(Maintenance::class)->enable();

        $this->report(['path' => '/durante-el-mantenimiento', 'locale' => 'es'])
            ->assertAccepted();

        $this->assertDatabaseHas('missing_urls', ['path' => '/durante-el-mantenimiento']);
    }

    /**
     * The loop this feature exists to close: a report becomes a redirect, and
     * the report stops asking to be dealt with.
     */
    #[Test]
    public function writing_a_redirect_resolves_the_report_it_answers(): void
    {
        $this->report(['path' => '/proyectos/viejo', 'locale' => 'es'])->assertAccepted();

        Redirect::create([
            'from' => '/proyectos/viejo',
            'to' => '/proyectos/nuevo',
            'status' => 301,
            'locale' => 'es',
            'is_enabled' => true,
        ]);

        $this->assertSame(
            MissingUrlStatus::Resolved,
            MissingUrl::query()->first()->status,
        );
    }

    #[Test]
    public function a_redirect_for_every_language_resolves_every_languages_report(): void
    {
        $this->report(['path' => '/algo', 'locale' => 'es'])->assertAccepted();
        $this->report(['path' => '/algo', 'locale' => 'ca'])->assertAccepted();

        Redirect::create([
            'from' => '/algo',
            'to' => '/otra-cosa',
            'status' => 301,
            'locale' => null,
            'is_enabled' => true,
        ]);

        $this->assertSame(0, MissingUrl::query()->pending()->count());
    }

    /**
     * A redirect that was written and then deleted leaves the address broken
     * again. Being told about it once must not mean being told never again.
     */
    #[Test]
    public function an_address_seen_again_after_being_dealt_with_comes_back(): void
    {
        $url = MissingUrl::factory()->resolved()->create([
            'path' => '/vuelve',
            'locale' => 'es',
        ]);

        $this->report(['path' => '/vuelve', 'locale' => 'es'])->assertAccepted();

        $url->refresh();

        $this->assertSame(MissingUrlStatus::Pending, $url->status);
        $this->assertNull($url->resolved_at);
    }
}