added chapter view, fixes, added ratings, added chapter updates/deletions

app/server/helpers.ts

@@ -1,3 +1,5 @@
+import { RatingType as RatingTypeSchema } from '@generated/types';
+import { Descendant, Text } from 'slate';
 import { IdentityContext } from './identity';
 
 export function ensureIdentity(
@@ -5,3 +7,28 @@ export function ensureIdentity(
 ): asserts identity is NonNullable<IdentityContext['identity']> {
   if (identity == null) throw new Error('Unauthorized.');
 }
+
+export function countWords(descendants: Descendant[]): number {
+  let wordCount = 0;
+
+  function traverse(nodes: Descendant[]) {
+    for (const node of nodes) {
+      if (Text.isText(node)) {
+        const words = node.text.trim().split(/\s+/).filter(Boolean);
+        wordCount += words.length;
+      } else if ('children' in node) {
+        traverse(node.children);
+      }
+    }
+  }
+
+  traverse(descendants);
+  return wordCount;
+}
+
+export function ensureRatingType(value: string): asserts value is RatingTypeSchema {
+  if (value === RatingTypeSchema.Up) return;
+  if (value === RatingTypeSchema.Down) return;
+
+  throw new Error('Invalid rating type');
+}