<?php

namespace Tests\Feature;

use App\Http\Middleware\VerifyCsrfToken;
use App\Models\Playlist;
use App\Models\User;
use App\Models\Video;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Support\Facades\DB;
use Tests\TestCase;

/**
 * Phase 3 — Feeds, search, trending.
 *
 * Guards against: trending window regressions, music feed opening on oldest,
 * search returning the wrong buckets, and the /videos/search → /search 301.
 */
class Phase3FeedsTest extends TestCase
{
    use RefreshDatabase;

    protected function setUp(): void
    {
        putenv('DB_CONNECTION=sqlite');
        putenv('DB_DATABASE=:memory:');
        $_ENV['DB_CONNECTION'] = 'sqlite';
        $_ENV['DB_DATABASE']   = ':memory:';

        parent::setUp();

        $this->withoutMiddleware([
            VerifyCsrfToken::class,
            \Illuminate\Session\Middleware\AuthenticateSession::class,
        ]);
    }

    // ─── Trending window ─────────────────────────────

    public function test_trending_accepts_24_168_720_and_snaps_others_to_24(): void
    {
        $this->get(route('videos.trending', ['hours' => 24]))->assertOk();
        $this->get(route('videos.trending', ['hours' => 168]))->assertOk();
        $this->get(route('videos.trending', ['hours' => 720]))->assertOk();

        // Garbage input must not crash; it snaps to 24.
        $this->get(route('videos.trending', ['hours' => 'abc']))->assertOk();
        $this->get(route('videos.trending', ['hours' => 99999]))->assertOk();
    }

    public function test_trending_ranks_by_in_window_views_then_likes(): void
    {
        $owner = $this->makeUser();

        // Three videos — "A" has most views in last 24h, "B" has most likes
        // but no views, "C" has nothing. A should be first; B should NOT
        // appear (no in-window views → filtered out); C should not appear.
        $a = $this->makeVideo($owner, 'A');
        $b = $this->makeVideo($owner, 'B');
        $c = $this->makeVideo($owner, 'C');

        $this->seedViews($a, 10);
        $this->seedViews($b, 0);
        $this->seedLikes($b, 5);
        $this->seedViews($c, 0);

        $r = $this->get(route('videos.trending', ['hours' => 24]));
        $r->assertOk();

        $html = $r->getContent();
        $this->assertStringContainsString('A', $html, 'Video A must appear — it has in-window views.');
        $this->assertStringNotContainsString('>B<', $html, 'Video B must not appear — zero in-window views.');
    }

    // ─── Music feed newest-first ─────────────────────

    public function test_music_feed_opens_on_newest_video(): void
    {
        $owner = $this->makeUser();
        // created_at isn't in Video::$fillable (Eloquent auto-manages it),
        // so set it after the row exists.
        $old = $this->makeVideo($owner, 'OLD MUSIC', ['type' => 'music']);
        $old->created_at = now()->subDays(5); $old->save();
        $new = $this->makeVideo($owner, 'NEW MUSIC', ['type' => 'music']);
        $new->created_at = now()->subMinutes(5); $new->save();

        $html = $this->get(route('videos.index', ['filter' => 'music']))->assertOk()->getContent();

        $posNew = strpos($html, 'NEW MUSIC');
        $posOld = strpos($html, 'OLD MUSIC');
        $this->assertNotFalse($posNew);
        $this->assertNotFalse($posOld);
        $this->assertLessThan($posOld, $posNew, 'Newer music video must appear before the older one.');
    }

    // ─── /videos/search → /search (301) ──────────────

    public function test_old_videos_search_url_301_redirects_to_search(): void
    {
        $this->get('/videos/search?q=hello')
            ->assertStatus(301)
            ->assertRedirect('/search?q=hello');
    }

    // ─── /search returns channel + playlist buckets ──

    public function test_search_matches_video_channel_and_playlist(): void
    {
        $owner = User::factory()->create([
            'name'     => 'Searchable Owner',
            'username' => 'searchable-channel-'.substr(bin2hex(random_bytes(4)), 0, 6),
        ]);
        $video = $this->makeVideo($owner, 'SearchableVideoTitle', ['description' => 'nothing special']);
        $pl    = Playlist::create([
            'user_id'    => $owner->id,
            'name'       => 'SearchablePlaylistName',
            'visibility' => 'public',
            'share_token'=> bin2hex(random_bytes(8)),
        ]);

        // 1. Query that matches a video title
        $html = $this->get(route('search', ['q' => 'SearchableVideo']))->assertOk()->getContent();
        $this->assertStringContainsString('SearchableVideoTitle', $html);

        // 2. Query that matches a channel name
        $html = $this->get(route('search', ['q' => 'Searchable Owner']))->assertOk()->getContent();
        $this->assertStringContainsString('Channels', $html);
        $this->assertStringContainsString('Searchable Owner', $html);

        // 3. Query that matches a playlist name
        $html = $this->get(route('search', ['q' => 'SearchablePlaylist']))->assertOk()->getContent();
        $this->assertStringContainsString('Playlists', $html);
        $this->assertStringContainsString('SearchablePlaylistName', $html);
    }

    public function test_empty_search_redirects_to_browse(): void
    {
        $this->get(route('search', ['q' => '']))
            ->assertRedirect(route('videos.index'));
    }

    // ─── Helpers ─────────────────────────────────────

    private function makeUser(): User
    {
        return User::factory()->create([
            'username' => 'u'.substr(bin2hex(random_bytes(4)), 0, 8),
        ]);
    }

    private function makeVideo(User $u, string $title, array $attrs = []): Video
    {
        return Video::create(array_merge([
            'user_id'     => $u->id,
            'title'       => $title,
            'description' => '',
            'filename'    => 'users/x/videos/'.substr(bin2hex(random_bytes(4)), 0, 8).'/video.mp4',
            'path'        => 'users/x/videos/'.substr(bin2hex(random_bytes(4)), 0, 8).'/video.mp4',
            'type'        => 'generic',
            'visibility'  => 'public',
            'status'      => 'ready',
            'share_token' => bin2hex(random_bytes(8)),
        ], $attrs));
    }

    private function seedViews(Video $v, int $n): void
    {
        for ($i = 0; $i < $n; $i++) {
            DB::table('video_views')->insert([
                'video_id'   => $v->id,
                'user_id'    => null,
                'device_id'  => 'dev-'.$i,
                'watched_at' => now()->subMinutes(10),
            ]);
        }
    }

    private function seedLikes(Video $v, int $n): void
    {
        for ($i = 0; $i < $n; $i++) {
            $u = $this->makeUser();
            DB::table('video_likes')->insert([
                'video_id'   => $v->id,
                'user_id'    => $u->id,
                'created_at' => now(),
                'updated_at' => now(),
            ]);
        }
    }
}