Init

app/Services/PlaylistService.php

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+<?php
+
+namespace App\Services;
+
+use App\Models\Playlist;
+use App\Models\PlaylistEpisode;
+
+class PlaylistService
+{
+    public function reorderPositions(Playlist $playlist): void
+    {
+        $episodes = PlaylistEpisode::where('playlist_id', $playlist->id)
+            ->orderBy('position')
+            ->get();
+
+        foreach ($episodes as $index => $episode) {
+            $episode->position = $index + 1;
+            $episode->save();
+        }
+    }
+
+    public function swapPositions(PlaylistEpisode $a, PlaylistEpisode $b): void
+    {
+        $temp = $a->position;
+        $a->position = $b->position;
+        $b->position = $temp;
+        $a->save();
+        $b->save();
+    }
+}