import fs from "fs";
import path from "path";
import Link from "next/link";
import { notFound } from "next/navigation";
import { ExtractedVerseCount } from "../../extracted-verse-count";

type ChapterInfo = {
  number: number;
  title: string;
  totalVerses: number;
};

type CantoInfo = {
  number: number;
  title: string;
  totalChapters: number;
  chapters: ChapterInfo[];
};

type Intro = {
  book: string;
  title: string;
  author: string;
  totalCantos: number;
  cantos: CantoInfo[];
};

function getIntro(): Intro {
  const introPath = path.join(process.cwd(), "app/lib/books/sb/intro.json");
  return JSON.parse(fs.readFileSync(introPath, "utf-8"));
}

export default async function CantoPage({
  params,
}: {
  params: Promise<{ canto: string }>;
}) {
  const { canto } = await params;
  const cantoNum = parseInt(canto);
  const intro = getIntro();

  const cantoInfo = intro.cantos.find((c) => c.number === cantoNum);
  if (!cantoInfo) notFound();

  const totalVerses = cantoInfo.chapters.reduce(
    (sum, ch) => sum + ch.totalVerses,
    0,
  );

  return (
    <div className="min-h-screen bg-amber-50 dark:bg-zinc-950">
      <header className="border-b border-amber-200 dark:border-zinc-800 bg-white dark:bg-zinc-900 px-6 py-8">
        <div className="max-w-3xl mx-auto">
          <Link
            href="/books/sb"
            className="text-sm text-amber-600 hover:text-amber-800 dark:text-zinc-400 dark:hover:text-zinc-100"
          >
            &larr; Śrīmad-Bhāgavatam
          </Link>
          <h1 className="mt-3 text-3xl font-bold text-zinc-900 dark:text-zinc-100">
            Canto {cantoInfo.number}: {cantoInfo.title}
          </h1>
          <p className="mt-1 text-zinc-500 dark:text-zinc-400">
            {cantoInfo.totalChapters} chapters ·{" "}
            <ExtractedVerseCount count={totalVerses} label="extracted verses" />
          </p>
        </div>
      </header>
      <main className="max-w-3xl mx-auto px-6 py-8">
        <ul className="divide-y divide-amber-200 dark:divide-zinc-800 bg-white dark:bg-zinc-900 rounded-lg border border-amber-200 dark:border-zinc-800 overflow-hidden">
          {cantoInfo.chapters.map((ch) => (
            <li key={ch.number}>
              <Link
                href={`/books/sb/${cantoNum}/${ch.number}`}
                className="flex items-center justify-between px-5 py-4 hover:bg-amber-50 dark:hover:bg-zinc-800 transition-colors"
              >
                <div>
                  <span className="text-sm text-amber-600 dark:text-amber-500 font-medium">
                    Chapter {ch.number}
                  </span>
                  <p className="font-medium text-zinc-900 dark:text-zinc-100">
                    {ch.title}
                  </p>
                </div>
                <span className="text-sm text-zinc-400 shrink-0 ml-4">
                  <ExtractedVerseCount count={ch.totalVerses} />
                </span>
              </Link>
            </li>
          ))}
        </ul>
      </main>
    </div>
  );
}