implemented snapshot diff; started work on admin settings

lib/Manager/SnapshotManager.php

@@ -2,15 +2,55 @@
 
 namespace OCA\GroupfolderFilesystemSnapshots\Manager;
 
-class SnapshotManager {
-    function get() {
-        $filesystem_path = "/srv/nextcloud/files/";
-        $filesystem_snapshot_path = "/srv/nextcloud/files/.zfs/snapshot/";
+use OCA\GroupfolderFilesystemSnapshots\Manager\PathManager;
+use OCA\GroupfolderFilesystemSnapshots\Manager\DiffManager;
 
-        $iterator = new \FilesystemIterator($filesystem_snapshot_path);
-        foreach ($iterator as $fileinfo) {
-            if(!$fileinfo->isDir()) continue;
-            yield $fileinfo->getFilename();
+use OCA\GroupfolderFilesystemSnapshots\Entity\Snapshot;
+
+class SnapshotManager {
+    private PathManager $pathManager;
+    private DiffManager $diffManager;
+
+
+    public function __construct(PathManager $pathManager, DiffManager $diffManager){
+        $this->pathManager = $pathManager;
+        $this->diffManager = $diffManager;
+    }
+
+    private function validSnapshotId(string $snapshotId) {
+        return (preg_match("/^[a-zA-Z0-9-_]+$/", $snapshotId) == 1);
+    }
+
+    function snapshotExists(string $snapshotId): bool {
+        if($this->validSnapshotId($snapshotId)) {
+            $path = $this->pathManager->getSnapshotPath($snapshotId);
+            return (file_exists($path) && is_dir($path));
+        } else {
+            return false;
         }
     }
+
+    function get(string $snapshotId) {
+        if(self::snapshotExists($snapshotId)) {
+            return new Snapshot($snapshotId);
+        } else {
+            return false;
+        }
+        
+    }
+
+    function getAll() {
+        $iterator = new \FilesystemIterator($this->pathManager->getFilesystemSnapshotPath());
+        foreach ($iterator as $fileinfo) {
+            if(!$fileinfo->isDir()) continue;
+            yield new Snapshot($fileinfo->getFilename());
+        }
+    }
+
+    function getDiff(int $groupfolderId, string $snapshotId) {
+        $groupfolderPath = $this->pathManager->getGroupFolderDirectory($groupfolderId);
+        $snapshotPath = $this->pathManager->getGroupFolderSnapshotDirectory($groupfolderId, $snapshotId);
+
+        return $this->diffManager->diffDirectories($snapshotPath, $groupfolderPath);
+    }
 }