<?php

namespace App\Http\Controllers;

use App\Models\Playlist;
use App\Models\User;
use App\Models\Video;
use App\Models\VideoAudioTrack;
use Illuminate\Http\Request;

/**
 * Site-wide search across videos, channels and playlists.
 *
 * Lives on /search?q=… so the URL reads like what you'd expect from a modern
 * site. The old /videos/search endpoint still works but redirects here, so
 * nothing bookmarked earlier breaks.
 *
 * Match surface:
 *   - Video title, description, tag list, primary language and the language
 *     of any secondary audio track attached to it.
 *   - User name, username (handle), and short bio.
 *   - Playlist name and description.
 *
 * We render the existing `videos.index` view so every search result lands in
 * the same card component the browse feeds use — one place to style, one place
 * to fix bugs.
 */
class SearchController extends Controller
{
    public function index(Request $request)
    {
        $query = trim((string) $request->get('q', ''));

        if ($query === '') {
            // No query → send the user back to the browse feed instead of an
            // empty "no results" page.
            return redirect()->route('videos.index');
        }

        $like    = '%' . $query . '%';
        $qLower  = mb_strtolower($query);

        // ── Videos ────────────────────────────────────────────────
        // Match on text columns AND on any audio-track language that aligns
        // with the query (e.g. searching "arabic" surfaces videos that carry
        // an Arabic track even if the primary language is English).
        $trackVideoIds = VideoAudioTrack::whereRaw('LOWER(language) = ?', [$qLower])
            ->pluck('video_id');

        $videoHits = Video::public()
            ->where(function ($q) use ($like, $qLower, $trackVideoIds) {
                $q->where('title',       'like', $like)
                  ->orWhere('description','like', $like)
                  ->orWhere('tags',       'like', $like)
                  ->orWhereRaw('LOWER(language) = ?', [$qLower])
                  ->orWhereIn('id', $trackVideoIds);
            })
            ->latest()
            ->limit(60)
            ->get();

        $videos = $videoHits->where('is_shorts', false)->values();
        $shorts = $videoHits->where('is_shorts', true)->values();

        // ── Channels ──────────────────────────────────────────────
        $channels = User::where(function ($q) use ($like) {
                $q->where('name',     'like', $like)
                  ->orWhere('username','like', $like)
                  ->orWhere('bio',    'like', $like);
            })
            ->orderByDesc('id')
            ->limit(12)
            ->get();

        // ── Playlists ─────────────────────────────────────────────
        $playlists = Playlist::where('visibility', 'public')
            ->where(function ($q) use ($like) {
                $q->where('name',       'like', $like)
                  ->orWhere('description','like', $like);
            })
            ->withCount('videos')
            ->with(['user', 'videos' => fn ($q) => $q->orderBy('playlist_videos.position')->limit(1)])
            ->latest()
            ->limit(12)
            ->get();

        return view('videos.index', [
            'videos'    => $videos,
            'shorts'    => $shorts,
            'playlists' => $playlists,
            'channels'  => $channels,
            'query'     => $query,
            'langChips' => [],
        ]);
    }
}