feat: add journals

lib/va.ts

@@ -0,0 +1,167 @@
+/**
+ * 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 { prisma } from "@/lib/db";
+import type { JsonValue } from "@prisma/client/runtime/library";
+
+// ---------------------------------------------------------------------------
+// Constants
+// ---------------------------------------------------------------------------
+
+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;
+}
+
+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);
+}
+
+// ---------------------------------------------------------------------------
+// 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;
+}
+
+// ---------------------------------------------------------------------------
+// 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,
+  }));
+}