feat: initialize Dr-Panel project with patient file number support

app/Observers/PatientObserver.php

@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Observers;
+
+use App\Models\Patient;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Storage;
+
+class PatientObserver
+{
+    private const FILE_FIELDS = ['photos_before', 'photos_after', 'videos', 'audio_files'];
+
+    public function creating(Patient $patient): void
+    {
+        if (empty($patient->file_number)) {
+            $max = DB::table('patients')->max('file_number');
+            $patient->file_number = max(100, ($max ?? 99) + 1);
+        }
+    }
+
+    public function updating(Patient $patient): void
+    {
+        foreach (self::FILE_FIELDS as $field) {
+            $rawOld   = $patient->getRawOriginal($field);
+            $oldFiles = ! empty($rawOld) ? (json_decode($rawOld, true) ?? []) : [];
+            $newFiles = array_values((array) ($patient->getAttribute($field) ?? []));
+            $removed  = array_diff($oldFiles, $newFiles);
+
+            foreach ($removed as $path) {
+                if (! empty(trim((string) $path))) {
+                    Storage::disk('public')->delete($path);
+                }
+            }
+        }
+    }
+
+    public function deleting(Patient $patient): void
+    {
+        foreach (self::FILE_FIELDS as $field) {
+            $files = $patient->getAttribute($field) ?? [];
+
+            foreach ((array) $files as $path) {
+                Storage::disk('public')->delete($path);
+            }
+        }
+    }
+}