Added verse-submission infrastructure

src/routes/api/verse-window/+server.ts

@@ -0,0 +1,51 @@
+import { json } from '@sveltejs/kit';
+import type { RequestHandler } from './$types';
+import { getBookById } from '$lib/server/bible';
+import {
+	composeVerseWindow,
+	formatWindowReference
+} from '$lib/server/xml-bible';
+
+// Live 3-verse preview for the submission selector. Computes the fall-forward
+// window anchored on the selected verse (spec: "Verse Windowing").
+export const GET: RequestHandler = async ({ url }) => {
+	const bookId = url.searchParams.get('bookId');
+	const chapterParam = url.searchParams.get('chapter');
+	const verseParam = url.searchParams.get('verse');
+
+	if (!bookId || !chapterParam || !verseParam) {
+		return json({ error: 'bookId, chapter, and verse are required' }, { status: 400 });
+	}
+
+	const book = getBookById(bookId);
+	if (!book) {
+		return json({ error: 'Unknown bookId' }, { status: 400 });
+	}
+
+	const chapter = Number(chapterParam);
+	const verse = Number(verseParam);
+	if (!Number.isInteger(chapter) || !Number.isInteger(verse) || chapter < 1 || verse < 1) {
+		return json({ error: 'chapter and verse must be positive integers' }, { status: 400 });
+	}
+
+	const window = composeVerseWindow(book.order, chapter, verse);
+	if (!window) {
+		// chapter/verse out of range — caught by composeVerseWindow's bounds checks
+		return json({ error: 'chapter or verse out of range for this book' }, { status: 400 });
+	}
+
+	const reference = formatWindowReference(
+		window.bookName,
+		window.startChapter,
+		window.startVerse,
+		window.endChapter,
+		window.endVerse
+	);
+
+	return json({
+		windowVerses: window.verses,
+		reference,
+		bookId: window.bookId,
+		selectedVerse: window.selectedVerse
+	});
+};