feat: implement bff layer
This commit is contained in:
gosangam
+34
-487
@@ -1,501 +1,48 @@
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/**
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* Data access layer for Songs of the Vaiṣṇava Ācāryas (SVA).
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*
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* Reads from MongoDB via Prisma, same as the rest of the app.
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* SVA is a hierarchical song book with 4 parent parts, each containing
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* multiple songs (sub-chapters). Each song is stored as its own
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* prose_chapters document with slugs like "1-1", "1-2", "2-1", etc.
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*
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* When the DB isn't seeded yet, falls back to reading local JSON files
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* from lib/jsons/books/sva/.
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*
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* Collections used:
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* - book_meta (via Prisma BookMeta model)
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* - prose_chapters (via Prisma ProseChapter model)
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* Delegates to the generic book data layer which calls the BFF API.
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* SVA is a hierarchical book with parent chapters and sub-chapters (songs).
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*/
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import { prisma } from "@/lib/db";
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import type { JsonValue } from "@prisma/client/runtime/library";
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import fs from "fs";
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import path from "path";
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import {
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getBookMeta,
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getIntroSegments,
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getIntroSegment,
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getChapter,
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getContent,
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getSidebarItems,
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getNavigableItems,
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type BookMeta,
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type IntroSegment,
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type Chapter,
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type SidebarItem,
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} from "@/lib/books";
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// ---------------------------------------------------------------------------
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// Constants
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// ---------------------------------------------------------------------------
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const CODE = "sva";
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const BOOK = "sva";
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export type SvaMeta = BookMeta;
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export type SvaSubChapterEntry = { slug: string; title: string };
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export type SvaIntroSegment = IntroSegment;
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export type SvaChapter = Chapter;
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export type SvaSidebarItem = SidebarItem;
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/** Volume sentinel for books without volumes. */
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const NO_VOLUME = 0;
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const SVA_JSON_DIR = path.join(process.cwd(), "lib", "jsons", "books", "sva");
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// ---------------------------------------------------------------------------
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// Types
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// ---------------------------------------------------------------------------
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export type SvaMeta = {
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book: string;
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title: string;
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author: string;
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year: number;
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description: string;
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totalChapters: number;
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chapters: SvaParentChapter[];
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};
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export type SvaParentChapter = {
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number: number;
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title: string;
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subChapters: SvaSubChapterEntry[];
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};
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export type SvaSubChapterEntry = {
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slug: string; // "1-1", "1-2", etc.
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title: string;
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};
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export type SvaIntroSegment = {
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slug: string;
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title: string;
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type: string;
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book: string;
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order: number;
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paragraphs: string[];
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};
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export type SvaChapter = {
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book: string;
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chapter: string; // "1-1", "2-1", etc.
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parentChapter: number;
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subChapter: number;
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title: string;
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parentTitle: string;
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type: string;
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paragraphs: string[];
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};
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/** Union type used in sidebar / table-of-contents navigation. */
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export type SvaSidebarItem = {
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/** URL-safe slug: "intro-front-pages", "1-1", "parent-1", etc. */
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slug: string;
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/** Human-readable label for the sidebar */
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label: string;
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/** "intro-segment" | "parent" | "sub-chapter" */
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type: string;
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/** Parent chapter number, or null for intro segments */
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parentChapter: number | null;
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};
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// ---------------------------------------------------------------------------
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// HTML sanitisation
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// ---------------------------------------------------------------------------
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function sanitizeHtml(html: string): string {
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let clean = html.replace(/<script[\s>][\s\S]*?<\/script>/gi, "");
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clean = clean.replace(/<style[\s>][\s\S]*?<\/style>/gi, "");
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clean = clean.replace(/<iframe[\s>][\s\S]*?<\/iframe>/gi, "");
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clean = clean.replace(
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/<\/?(?:script|style|iframe|object|embed|form|input|textarea|select|button)[^>]*>/gi,
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"",
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);
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clean = clean.replace(/\s+on\w+\s*=\s*(?:"[^"]*"|'[^']*'|[^\s>]+)/gi, "");
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clean = clean.replace(/href\s*=\s*"javascript:[^"]*"/gi, 'href=""');
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clean = clean.replace(/href\s*=\s*'javascript:[^']*'/gi, "href=''");
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return clean;
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export async function getSvaMeta() {
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return getBookMeta(CODE);
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}
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/** Normalize paragraphs — handles both native arrays and stringified JSON. */
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function normalizeParagraphs(paragraphs: string[] | JsonValue): string[] {
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let result: string[];
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if (typeof paragraphs === "string") {
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try {
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const parsed = JSON.parse(paragraphs);
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result = Array.isArray(parsed) ? parsed : [paragraphs];
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} catch {
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result = [paragraphs];
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}
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} else if (Array.isArray(paragraphs)) {
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result = paragraphs as string[];
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} else {
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result = [];
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}
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return result.map(sanitizeHtml);
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export async function getSvaIntroSegments() {
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return getIntroSegments(CODE);
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}
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// ---------------------------------------------------------------------------
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// Local JSON helpers (fallback when DB is not seeded)
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// ---------------------------------------------------------------------------
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function readLocalJson<T>(filePath: string): T | null {
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try {
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if (!fs.existsSync(filePath)) return null;
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return JSON.parse(fs.readFileSync(filePath, "utf-8")) as T;
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} catch {
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return null;
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}
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export async function getSvaIntroSegment(slug: string) {
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return getIntroSegment(CODE, slug);
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}
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function getLocalIntroSegments(): SvaIntroSegment[] {
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const introDir = path.join(SVA_JSON_DIR, "intro");
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if (!fs.existsSync(introDir)) return [];
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const results: SvaIntroSegment[] = [];
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const files = ["front-pages.json", "foreword.json", "introduction.json"];
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for (const file of files) {
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const filePath = path.join(introDir, file);
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const seg = readLocalJson<SvaIntroSegment>(filePath);
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if (seg) {
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results.push({
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...seg,
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slug: seg.slug.startsWith("intro-") ? seg.slug : `intro-${seg.slug}`,
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});
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}
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}
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return results.sort((a, b) => a.order - b.order);
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export async function getSvaChapter(slug: string) {
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return getChapter(CODE, slug);
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}
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function getLocalSubChapter(slug: string): SvaChapter | null {
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const filePath = path.join(SVA_JSON_DIR, "chapters", `${slug}.json`);
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return readLocalJson<SvaChapter>(filePath);
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export async function getSvaContent(slug: string) {
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return getContent(CODE, slug);
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}
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// ---------------------------------------------------------------------------
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// Book meta
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// ---------------------------------------------------------------------------
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/**
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* Book-level metadata (title, author, chapter list with sub-chapters, etc.)
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*/
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export async function getSvaMeta(): Promise<SvaMeta | null> {
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try {
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const meta = await prisma.bookMeta.findUnique({ where: { book: BOOK } });
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if (meta) return meta.data as unknown as SvaMeta;
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} catch {
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// fall through to local JSON
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}
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// Fallback to local JSON
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const introPath = path.join(SVA_JSON_DIR, "intro.json");
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return readLocalJson<SvaMeta>(introPath);
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}
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// ---------------------------------------------------------------------------
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// Intro segments
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// ---------------------------------------------------------------------------
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/**
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* All intro segments, ordered by their `order` field.
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*/
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export async function getSvaIntroSegments(): Promise<SvaIntroSegment[]> {
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try {
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const results = await prisma.proseChapter.findMany({
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where: { book: BOOK, volume: NO_VOLUME, type: "intro-segment" },
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orderBy: { order: "asc" },
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});
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if (results.length > 0) {
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return results.map((doc) => ({
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slug: doc.slug,
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title: doc.title,
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type: doc.type,
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book: doc.book,
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order: doc.order,
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paragraphs: normalizeParagraphs(doc.paragraphs),
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}));
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}
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} catch {
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// fall through to local JSON
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}
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// Fallback to local JSON
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return getLocalIntroSegments();
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}
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/**
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* A single intro segment by slug.
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* Accepts both "intro-foreword" (URL slug) and "foreword" (raw slug).
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*/
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export async function getSvaIntroSegment(
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slug: string,
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): Promise<SvaIntroSegment | null> {
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// DB stores with "intro-" prefix; accept either form
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const dbSlug = slug.startsWith("intro-") ? slug : `intro-${slug}`;
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const rawSlug = slug.startsWith("intro-")
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? slug.replace(/^intro-/, "")
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: slug;
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try {
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const doc = await prisma.proseChapter.findUnique({
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where: {
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book_volume_slug: { book: BOOK, volume: NO_VOLUME, slug: dbSlug },
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},
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});
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if (doc) {
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return {
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slug: doc.slug,
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title: doc.title,
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type: doc.type,
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book: doc.book,
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order: doc.order,
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paragraphs: normalizeParagraphs(doc.paragraphs),
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};
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}
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} catch {
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// fall through to local JSON
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}
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// Fallback to local JSON
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const filePath = path.join(SVA_JSON_DIR, "intro", `${rawSlug}.json`);
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const local = readLocalJson<SvaIntroSegment>(filePath);
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if (!local) return null;
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return {
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...local,
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slug: dbSlug,
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paragraphs: local.paragraphs.map(sanitizeHtml),
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};
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}
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// ---------------------------------------------------------------------------
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// Chapters (sub-chapters / songs like "1-1", "2-3", etc.)
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// ---------------------------------------------------------------------------
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/**
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* A sub-chapter (song) by its slug (e.g. "1-1", "2-3").
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*/
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export async function getSvaChapter(slug: string): Promise<SvaChapter | null> {
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try {
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const doc = await prisma.proseChapter.findUnique({
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where: {
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book_volume_slug: {
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book: BOOK,
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volume: NO_VOLUME,
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slug,
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},
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},
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});
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if (doc) {
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// Parse parentChapter and subChapter from slug "X-Y"
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const parts = slug.split("-");
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const parentChapter = parseInt(parts[0], 10);
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const subChapter = parseInt(parts[1], 10);
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// Derive parentTitle from meta if available
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const meta = await getSvaMeta();
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const parentEntry = meta?.chapters.find(
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(ch) => ch.number === parentChapter,
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);
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const parentTitle = parentEntry?.title ?? "";
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return {
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book: doc.book,
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chapter: slug,
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parentChapter,
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subChapter,
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title: doc.title,
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parentTitle,
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type: doc.type,
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paragraphs: normalizeParagraphs(doc.paragraphs),
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};
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}
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} catch {
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// fall through to local JSON
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}
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// Fallback to local JSON
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const local = getLocalSubChapter(slug);
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if (!local) return null;
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return {
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...local,
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paragraphs: local.paragraphs.map(sanitizeHtml),
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};
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}
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// ---------------------------------------------------------------------------
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// Unified content accessor
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// ---------------------------------------------------------------------------
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/**
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* Get content by URL slug.
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*
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* "intro-front-pages" → intro segment
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* "intro-foreword" → intro segment
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* "intro-introduction" → intro segment
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* "1-1", "2-3", etc. → sub-chapter (song)
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*/
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export async function getSvaContent(
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slug: string,
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): Promise<SvaChapter | SvaIntroSegment | null> {
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if (slug.startsWith("intro-")) {
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return getSvaIntroSegment(slug);
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}
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// Sub-chapter slug like "1-1", "2-3"
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return getSvaChapter(slug);
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}
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// ---------------------------------------------------------------------------
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// Sidebar navigation
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// ---------------------------------------------------------------------------
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/**
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* Build the full sidebar navigation list with hierarchical structure.
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*
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* Order: intro segments (front-pages, foreword, introduction)
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* → parent-1 (label) → 1-1, 1-2, ...
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* → parent-2 (label) → 2-1, 2-2, ...
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* → etc.
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*
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* "parent" type items are non-clickable headings. Only "intro-segment" and
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* "sub-chapter" items are navigable pages.
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*/
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export async function getSvaSidebarItems(): Promise<SvaSidebarItem[]> {
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let allDocs: {
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slug: string;
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title: string;
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type: string;
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chapter: number | null;
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order: number;
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}[] = [];
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const meta = await getSvaMeta();
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try {
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const results = await prisma.proseChapter.findMany({
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where: { book: BOOK, volume: NO_VOLUME },
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orderBy: { order: "asc" },
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select: {
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slug: true,
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title: true,
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type: true,
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chapter: true,
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order: true,
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},
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});
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allDocs = results;
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} catch {
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// Prisma error — build sidebar from meta alone
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}
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if (!meta) {
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// Try building from local JSON
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const localMeta = readLocalJson<SvaMeta>(
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path.join(SVA_JSON_DIR, "intro.json"),
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);
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if (!localMeta) return [];
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return buildSidebarFromMeta(localMeta);
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}
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// If we have no DB docs, build from meta alone
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if (allDocs.length === 0) {
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return buildSidebarFromMeta(meta);
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}
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const items: SvaSidebarItem[] = [];
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// Intro segments that come BEFORE chapters (order < 99)
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for (const doc of allDocs) {
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if (doc.type === "intro-segment" && doc.order < 99) {
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||||
items.push({
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||||
slug: doc.slug,
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||||
label: doc.title,
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type: "intro-segment",
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||||
parentChapter: null,
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||||
});
|
||||
}
|
||||
}
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||||
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||||
// Chapters — grouped by parent chapter with sub-chapters
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for (const ch of meta.chapters) {
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// Parent heading (non-clickable label)
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||||
items.push({
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||||
slug: `parent-${ch.number}`,
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label: `Part ${ch.number}: ${ch.title}`,
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||||
type: "parent",
|
||||
parentChapter: ch.number,
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||||
});
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||||
|
||||
// Sub-chapters under this parent
|
||||
for (const sub of ch.subChapters) {
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items.push({
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||||
slug: sub.slug,
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||||
label: sub.title,
|
||||
type: "sub-chapter",
|
||||
parentChapter: ch.number,
|
||||
});
|
||||
}
|
||||
}
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||||
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||||
// Intro segments that come AFTER chapters (order >= 99)
|
||||
for (const doc of allDocs) {
|
||||
if (doc.type === "intro-segment" && doc.order >= 99) {
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||||
items.push({
|
||||
slug: doc.slug,
|
||||
label: doc.title,
|
||||
type: "intro-segment",
|
||||
parentChapter: null,
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
return items;
|
||||
}
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||||
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||||
/**
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* Build sidebar items purely from metadata (when DB is unavailable).
|
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*/
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||||
function buildSidebarFromMeta(meta: SvaMeta): SvaSidebarItem[] {
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||||
const items: SvaSidebarItem[] = [];
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||||
|
||||
// Hardcoded intro segments
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||||
items.push({
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||||
slug: "intro-front-pages",
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||||
label: "Front Pages",
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||||
type: "intro-segment",
|
||||
parentChapter: null,
|
||||
});
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||||
items.push({
|
||||
slug: "intro-foreword",
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||||
label: "Foreword",
|
||||
type: "intro-segment",
|
||||
parentChapter: null,
|
||||
});
|
||||
items.push({
|
||||
slug: "intro-introduction",
|
||||
label: "Introduction",
|
||||
type: "intro-segment",
|
||||
parentChapter: null,
|
||||
});
|
||||
|
||||
for (const ch of meta.chapters) {
|
||||
items.push({
|
||||
slug: `parent-${ch.number}`,
|
||||
label: `Part ${ch.number}: ${ch.title}`,
|
||||
type: "parent",
|
||||
parentChapter: ch.number,
|
||||
});
|
||||
|
||||
for (const sub of ch.subChapters) {
|
||||
items.push({
|
||||
slug: sub.slug,
|
||||
label: sub.title,
|
||||
type: "sub-chapter",
|
||||
parentChapter: ch.number,
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
return items;
|
||||
}
|
||||
|
||||
/**
|
||||
* Get the flat list of navigable sidebar items (excludes "parent" headings).
|
||||
* Used for prev/next navigation.
|
||||
*/
|
||||
export function getNavigableItems(items: SvaSidebarItem[]): SvaSidebarItem[] {
|
||||
return items.filter((item) => item.type !== "parent");
|
||||
export async function getSvaSidebarItems() {
|
||||
return getSidebarItems(CODE);
|
||||
}
|
||||
export { getNavigableItems };
|
||||
|
||||
Reference in New Issue
Block a user