refactor: rename states to view controllers (#1060)

app/assets/javascripts/Controllers/Navigation/Utils.ts

@@ -0,0 +1,38 @@
+import { SNApplication, SNTag } from '@standardnotes/snjs'
+
+export const rootTags = (application: SNApplication): SNTag[] => {
+  const hasNoParent = (tag: SNTag) => !application.items.getTagParent(tag)
+
+  const allTags = application.items.getDisplayableTags()
+  const rootTags = allTags.filter(hasNoParent)
+
+  return rootTags
+}
+
+export const tagSiblings = (application: SNApplication, tag: SNTag): SNTag[] => {
+  const withoutCurrentTag = (tags: SNTag[]) => tags.filter((other) => other.uuid !== tag.uuid)
+
+  const isTemplateTag = application.items.isTemplateItem(tag)
+  const parentTag = !isTemplateTag && application.items.getTagParent(tag)
+
+  if (parentTag) {
+    const siblingsAndTag = application.items.getTagChildren(parentTag)
+    return withoutCurrentTag(siblingsAndTag)
+  }
+
+  return withoutCurrentTag(rootTags(application))
+}
+
+export const isValidFutureSiblings = (application: SNApplication, futureSiblings: SNTag[], tag: SNTag): boolean => {
+  const siblingWithSameName = futureSiblings.find((otherTag) => otherTag.title === tag.title)
+
+  if (siblingWithSameName) {
+    application.alertService
+      ?.alert(
+        `A tag with the name ${tag.title} already exists at this destination. Please rename this tag before moving and try again.`,
+      )
+      .catch(console.error)
+    return false
+  }
+  return true
+}