feat: implement bff layer

lib/va.ts

@@ -1,167 +1,29 @@
-/**
- * Data access layer for Vaiśiṣṭyāṣṭakam (VA).
- *
- * Reads from MongoDB via Prisma.
- * VA is a poetic work with 8 chapters (Vaiśiṣṭyas) and no intro segments.
- *
- * Collections used:
- *   - book_meta (via Prisma BookMeta model)
- *   - prose_chapters (via Prisma ProseChapter model)
- */
+import {
+  getBookMeta,
+  getChapter,
+  getContent,
+  getSidebarItems,
+  type BookMeta,
+  type Chapter,
+  type SidebarItem,
+} from "@/lib/books";
 
-import { prisma } from "@/lib/db";
-import type { JsonValue } from "@prisma/client/runtime/library";
+const CODE = "va";
 
-// ---------------------------------------------------------------------------
-// Constants
-// ---------------------------------------------------------------------------
+export type VaMeta = BookMeta;
+export type VaChapterEntry = { number: number; title: string };
+export type VaChapter = Chapter;
+export type VaSidebarItem = SidebarItem;
 
-const BOOK = "va";
-
-/** Volume sentinel for books without volumes. */
-const NO_VOLUME = 0;
-
-// ---------------------------------------------------------------------------
-// Types
-// ---------------------------------------------------------------------------
-
-export type VaMeta = {
-  book: string;
-  title: string;
-  author: string;
-  year: number;
-  description: string;
-  totalChapters: number;
-  chapters: VaChapterEntry[];
-};
-
-export type VaChapterEntry = {
-  number: number;
-  title: string;
-};
-
-export type VaChapter = {
-  book: string;
-  chapter: number | null;
-  title: string;
-  type: string;
-  slug?: string;
-  paragraphs: string[];
-};
-
-/** Used in sidebar / table-of-contents navigation. */
-export type VaSidebarItem = {
-  slug: string;
-  label: string;
-  type: string;
-  chapter: number | null;
-};
-
-// ---------------------------------------------------------------------------
-// HTML sanitisation
-// ---------------------------------------------------------------------------
-
-function sanitizeHtml(html: string): string {
-  let clean = html.replace(/<script[\s>][\s\S]*?<\/script>/gi, "");
-  clean = clean.replace(/<style[\s>][\s\S]*?<\/style>/gi, "");
-  clean = clean.replace(/<iframe[\s>][\s\S]*?<\/iframe>/gi, "");
-  clean = clean.replace(
-    /<\/?(?:script|style|iframe|object|embed|form|input|textarea|select|button)[^>]*>/gi,
-    "",
-  );
-  clean = clean.replace(/\s+on\w+\s*=\s*(?:"[^"]*"|'[^']*'|[^\s>]+)/gi, "");
-  clean = clean.replace(/href\s*=\s*"javascript:[^"]*"/gi, 'href=""');
-  clean = clean.replace(/href\s*=\s*'javascript:[^']*'/gi, "href=''");
-  return clean;
+export async function getVaMeta() {
+  return getBookMeta(CODE);
 }
-
-function normalizeParagraphs(paragraphs: string[] | JsonValue): string[] {
-  let result: string[];
-
-  if (typeof paragraphs === "string") {
-    try {
-      const parsed = JSON.parse(paragraphs);
-      result = Array.isArray(parsed) ? parsed : [paragraphs];
-    } catch {
-      result = [paragraphs];
-    }
-  } else if (Array.isArray(paragraphs)) {
-    result = paragraphs as string[];
-  } else {
-    result = [];
-  }
-
-  return result.map(sanitizeHtml);
+export async function getVaChapter(chapterNum: number) {
+  return getChapter(CODE, String(chapterNum));
 }
-
-// ---------------------------------------------------------------------------
-// Book meta
-// ---------------------------------------------------------------------------
-
-export async function getVaMeta(): Promise<VaMeta | null> {
-  const meta = await prisma.bookMeta.findUnique({ where: { book: BOOK } });
-  if (!meta) return null;
-  return meta.data as unknown as VaMeta;
+export async function getVaContent(slug: string) {
+  return getContent(CODE, slug);
 }
-
-// ---------------------------------------------------------------------------
-// Chapters
-// ---------------------------------------------------------------------------
-
-export async function getVaChapter(
-  chapterNum: number,
-): Promise<VaChapter | null> {
-  if (chapterNum < 1 || chapterNum > 8 || !Number.isInteger(chapterNum)) {
-    return null;
-  }
-
-  const doc = await prisma.proseChapter.findUnique({
-    where: {
-      book_volume_slug: {
-        book: BOOK,
-        volume: NO_VOLUME,
-        slug: String(chapterNum),
-      },
-    },
-  });
-  if (!doc) return null;
-
-  return {
-    book: doc.book,
-    chapter: doc.chapter,
-    title: doc.title,
-    type: doc.type,
-    slug: doc.slug,
-    paragraphs: normalizeParagraphs(doc.paragraphs),
-  };
-}
-
-// ---------------------------------------------------------------------------
-// Unified content accessor
-// ---------------------------------------------------------------------------
-
-export async function getVaContent(
-  slug: string,
-): Promise<VaChapter | null> {
-  const num = Number(slug);
-  if (!Number.isNaN(num) && Number.isInteger(num) && num >= 1 && num <= 8) {
-    return getVaChapter(num);
-  }
-  return null;
-}
-
-// ---------------------------------------------------------------------------
-// Sidebar navigation
-// ---------------------------------------------------------------------------
-
-export async function getVaSidebarItems(): Promise<VaSidebarItem[]> {
-  const meta = await getVaMeta();
-  if (!meta) return [];
-
-  return meta.chapters.map((ch) => ({
-    slug: String(ch.number),
-    label: `${ch.number}. ${ch.title}`,
-    type: "chapter",
-    chapter: ch.number,
-  }));
+export async function getVaSidebarItems() {
+  return getSidebarItems(CODE);
 }