TF-37 Generate tree with Map

lib/features/mailbox/presentation/model/mailbox_tree_builder.dart

@@ -1,6 +1,5 @@
 import 'dart:collection';
 
-import 'package:built_collection/built_collection.dart';
 import 'package:jmap_dart_client/jmap/mail/mailbox/mailbox.dart';
 import 'package:model/mailbox/presentation_mailbox.dart';
 
@@ -9,50 +8,24 @@ import 'mailbox_tree.dart';
 
 class TreeBuilder {
   Future<MailboxTree> generateMailboxTree(List<PresentationMailbox> mailboxesList) async {
-    final Map<MailboxId, BuiltList<PresentationMailbox>> mapNotFoundParentMailbox = HashMap();
+    final Map<MailboxId, MailboxNode> mailboxDictionary = HashMap();
 
     final tree = MailboxTree(MailboxNode.root());
     mailboxesList.forEach((mailbox) {
-      if (mailbox.hasParentId()) {
-        final parentId = mailbox.parentId!;
-        final foundParent = tree.findNode(parentId);
-        if (foundParent != null) {
-          _addDescendant(tree, mailbox, maybeDescendant: mapNotFoundParentMailbox);
-        } else {
-          final siblingTrees = mapNotFoundParentMailbox[mailbox.parentId];
-          if (siblingTrees != null) {
-            mapNotFoundParentMailbox.addAll({
-              parentId: (ListBuilder<PresentationMailbox>(siblingTrees)..add(mailbox)).build()
-            });
-          } else {
-            mapNotFoundParentMailbox.addAll({parentId: (ListBuilder<PresentationMailbox>()..add(mailbox)).build()});
-          }
-        }
-      } else {
-        _addDescendant(tree, mailbox, maybeDescendant: mapNotFoundParentMailbox);
-      }
+      mailboxDictionary[mailbox.id] = MailboxNode(mailbox);
     });
-    mapNotFoundParentMailbox.forEach((_, listMailbox) {
-      listMailbox.forEach((mailbox) {
-        _addDescendant(tree, mailbox);
-      });
+    mailboxesList.forEach((mailbox) {
+      final parentId = mailbox.parentId;
+      final parentNode = mailboxDictionary[parentId];
+      final node = mailboxDictionary[mailbox.id];
+      if (node != null) {
+        if (parentNode != null) {
+          parentNode.addChildNode(node);
+        } else {
+          tree.root.addChildNode(node);
+        }
+      }
     });
     return tree;
   }
-
-  MailboxNode? _addDescendant(
-      MailboxTree tree,
-      PresentationMailbox mailboxChild,
-      {Map<MailboxId, BuiltList<PresentationMailbox>>? maybeDescendant}
-      ) {
-    final queue = ListQueue<PresentationMailbox>();
-    queue.addLast(mailboxChild);
-    while (queue.isNotEmpty) {
-      final current = queue.removeFirst();
-      tree.insertNode(current);
-      maybeDescendant?.remove(current.id)?.forEach((child) {
-        queue.addLast(child);
-      });
-    }
-  }
 }