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<?php |
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namespace App\Services; |
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use App\Models\Playlist; |
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use App\Models\Rule; |
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use App\Models\Song; |
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use App\Models\User; |
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use App\Repositories\SongRepository; |
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use Illuminate\Database\Eloquent\Builder; |
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use Illuminate\Database\Eloquent\Collection; |
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use RuntimeException; |
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class SmartPlaylistService |
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{ |
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private const RULE_REQUIRES_USER_PREFIXES = ['interactions.']; |
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private $songRepository; |
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public function __construct(SongRepository $songRepository) |
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{ |
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$this->songRepository = $songRepository; |
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} |
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public function getSongs(Playlist $playlist): Collection |
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{ |
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if (!$playlist->is_smart) { |
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throw new RuntimeException($playlist->name.' is not a smart playlist.'); |
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} |
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$rules = $this->addRequiresUserRules($playlist->rules, $playlist->user); |
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return $this->buildQueryFromRules($rules)->get(); |
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} |
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public function buildQueryFromRules(array $rules): Builder |
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{ |
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$query = Song::query(); |
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collect($rules)->each(static function (array $ruleGroup) use ($query): void { |
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$query->orWhere(static function (Builder $subQuery) use ($ruleGroup): void { |
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foreach ($ruleGroup['rules'] as $config) { |
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Rule::create($config)->build($subQuery); |
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} |
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}); |
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}); |
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return $query; |
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} |
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/** |
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* Some rules need to be driven by an additional "user" factor, for example play count, liked, or last played |
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* (basically everything related to interactions). |
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* For those, we create an additional "user_id" rule. |
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* |
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* @param array[] $rules |
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*/ |
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public function addRequiresUserRules(array $rules, User $user): array |
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{ |
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foreach ($rules as &$ruleGroup) { |
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$additionalRules = []; |
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foreach ($ruleGroup['rules'] as &$config) { |
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foreach (self::RULE_REQUIRES_USER_PREFIXES as $modelPrefix) { |
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if (starts_with($config['model'], $modelPrefix)) { |
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$additionalRules[] = $this->createRequireUserRule($user, $modelPrefix); |
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} |
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} |
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} |
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// make sure all those additional rules are unique. |
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$ruleGroup['rules'] = array_merge($ruleGroup['rules'], collect($additionalRules)->unique('model')->all()); |
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} |
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return $rules; |
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} |
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private function createRequireUserRule(User $user, string $modelPrefix): array |
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{ |
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return [ |
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'model' => $modelPrefix.'user_id', |
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'operator' => 'is', |
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'value' => [$user->id], |
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]; |
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} |
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} |
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phanan /
koel
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