import { NextResponse } from "next/server";
import {
  getSingleVerse,
  getChapterVerseIndex,
  getChapterVerses,
} from "@/lib/api";

export async function GET(
  req: Request,
  { params }: { params: Promise<{ book: string }> },
) {
  const { book } = await params;
  const url = new URL(req.url);
  const division = url.searchParams.get("division") || null;
  const chapterStr = url.searchParams.get("chapter");
  const verseStr = url.searchParams.get("verse");
  const indexOnly = url.searchParams.get("indexOnly") === "true";
  const pageStr = url.searchParams.get("page");
  const limitStr = url.searchParams.get("limit");

  if (!chapterStr) {
    return NextResponse.json(
      { error: "chapter query param is required" },
      { status: 400 },
    );
  }

  const chapter = parseInt(chapterStr);

  const effectiveDivision = book === "bg" ? null : division;

  // --- Single verse mode: ?verse=N ---
  if (verseStr) {
    const verseNum = parseInt(verseStr);
    const verse = await getSingleVerse(
      book,
      effectiveDivision,
      chapter,
      verseNum,
    );

    if (!verse) {
      return NextResponse.json({ error: "Verse not found" }, { status: 404 });
    }

    return NextResponse.json(verse);
  }

  // --- Index-only mode: return lightweight verse list for the sidebar ---
  if (indexOnly) {
    const verses = await getChapterVerseIndex(book, effectiveDivision, chapter);

    return NextResponse.json({ verses, total: verses.length });
  }

  // --- Paginated mode: return full verse data in pages ---
  const page = Math.max(1, parseInt(pageStr || "1"));
  const limit = Math.min(100, Math.max(1, parseInt(limitStr || "20")));

  const result = await getChapterVerses(
    book,
    effectiveDivision,
    chapter,
    page,
    limit,
  );

  return NextResponse.json(result);
}