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<?php
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declare(strict_types=1);
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namespace App\Services;
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use App\Models\Artwork;
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use Illuminate\Support\Facades\DB;
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use Illuminate\Support\Facades\Log;
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/**
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* TrendingService
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*
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* Calculates and persists deterministic trending scores for artworks.
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*
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* Formula (Phase 1):
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* score = (favorites_velocity * wf)
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* + (comments_velocity * wc)
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* + (shares_velocity * ws)
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* + (downloads_velocity * wd)
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* + (views_velocity * wv)
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* - (hours_since_published * 0.1)
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*
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* The score is stored in artworks.trending_score_1h / 24h / 7d.
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*
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* Both columns are updated every run; use `--period` to limit computation.
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*/
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final class TrendingService
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{
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/** Weight constants — tune via config('discovery.trending.*') if needed */
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private const W_AWARD = 5.0;
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private const W_FAVORITE = 3.0;
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private const W_REACTION = 2.0;
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private const W_DOWNLOAD = 1.0;
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private const W_VIEW = 2.0;
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private const DECAY_RATE = 0.1; // score loss per hour since publish
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/**
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* Recalculate trending scores for artworks published within the look-back window.
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*
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* @param string $period '1h' targets trending_score_1h (3-day window)
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* '24h' targets trending_score_24h (7-day window)
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* '7d' targets trending_score_7d (30-day window)
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* @param int $chunkSize Number of IDs per DB UPDATE batch
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* @return int Number of artworks updated
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*/
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public function recalculate(string $period = '7d', int $chunkSize = 1000): int
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{
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[$column, $windowDays] = match ($period) {
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'1h' => ['trending_score_1h', 3],
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'24h' => ['trending_score_24h', 7],
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default => ['trending_score_7d', 30],
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};
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// Use the windowed counters: views_24h/views_7d and downloads_24h/downloads_7d
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// instead of all-time totals so trending reflects recent activity.
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[$viewCol, $dlCol] = match ($period) {
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'1h' => ['views_1h', 'downloads_1h'],
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'24h' => ['views_24h', 'downloads_24h'],
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default => ['views_7d', 'downloads_7d'],
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};
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[$favCol, $commentCol, $shareCol] = match ($period) {
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'1h' => ['favourites_1h', 'comments_1h', 'shares_1h'],
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'24h' => ['favourites_24h', 'comments_24h', 'shares_24h'],
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default => ['favorites', 'comments_count', 'shares_count'],
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};
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$weights = (array) config('discovery.v2.trending.velocity_weights', []);
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$wView = (float) ($weights['views'] ?? self::W_VIEW);
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$wFavorite = (float) ($weights['favorites'] ?? self::W_FAVORITE);
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$wComment = (float) ($weights['comments'] ?? self::W_REACTION);
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$wShare = (float) ($weights['shares'] ?? self::W_DOWNLOAD);
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$cutoff = now()->subDays($windowDays)->toDateTimeString();
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$updated = 0;
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Artwork::query()
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->select('id')
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->where('is_public', true)
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->where('is_approved', true)
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->whereNull('deleted_at')
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->whereNotNull('published_at')
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->where('published_at', '>=', $cutoff)
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->orderBy('id')
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->chunkById($chunkSize, function ($artworks) use ($column, $viewCol, $dlCol, $favCol, $commentCol, $shareCol, $wFavorite, $wComment, $wShare, $wView, &$updated): void {
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$ids = $artworks->pluck('id')->toArray();
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$inClause = implode(',', array_fill(0, count($ids), '?'));
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// One bulk UPDATE per chunk – uses pre-computed windowed counters
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// for views and downloads (accurate rolling windows, reset nightly/weekly)
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// rather than all-time totals. All other signals use correlated subqueries.
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// Column name ($column) is controlled internally, not user-supplied.
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DB::update(
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"UPDATE artworks
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SET
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{$column} = GREATEST(
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COALESCE((SELECT {$favCol} FROM artwork_stats WHERE artwork_stats.artwork_id = artworks.id), 0) * ?
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+ COALESCE((SELECT {$commentCol} FROM artwork_stats WHERE artwork_stats.artwork_id = artworks.id), 0) * ?
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+ COALESCE((SELECT {$shareCol} FROM artwork_stats WHERE artwork_stats.artwork_id = artworks.id), 0) * ?
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+ COALESCE((SELECT {$dlCol} FROM artwork_stats WHERE artwork_stats.artwork_id = artworks.id), 0) * ?
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+ COALESCE((SELECT {$viewCol} FROM artwork_stats WHERE artwork_stats.artwork_id = artworks.id), 0) * ?
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- (TIMESTAMPDIFF(HOUR, artworks.published_at, NOW()) * ?)
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, 0),
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last_trending_calculated_at = NOW()
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WHERE id IN ({$inClause})",
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array_merge(
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[$wFavorite, $wComment, $wShare, self::W_DOWNLOAD, $wView, self::DECAY_RATE],
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$ids
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)
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);
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$updated += count($ids);
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});
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Log::info('TrendingService: recalculation complete', [
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'period' => $period,
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'column' => $column,
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'updated' => $updated,
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]);
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return $updated;
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}
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/**
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* Dispatch Meilisearch re-index jobs for artworks in the trending window.
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* Called after recalculate() to keep the search index current.
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*/
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public function syncToSearchIndex(string $period = '7d', int $chunkSize = 500): void
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{
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$windowDays = match ($period) {
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'1h' => 3,
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'24h' => 7,
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default => 30,
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};
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$cutoff = now()->subDays($windowDays)->toDateTimeString();
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Artwork::query()
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->select('id')
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->where('is_public', true)
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->where('is_approved', true)
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->whereNull('deleted_at')
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->where('published_at', '>=', $cutoff)
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->chunkById($chunkSize, function ($artworks): void {
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foreach ($artworks as $artwork) {
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\App\Jobs\IndexArtworkJob::dispatch($artwork->id);
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}
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});
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}
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}
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