import fs from "fs";
import path from "path";
import Link from "next/link";
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[];
};

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

  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"
            className="text-sm text-amber-600 hover:text-amber-800 dark:text-zinc-400 dark:hover:text-zinc-100"
          >
            &larr; Books
          </Link>
          <h1 className="mt-3 text-3xl font-bold text-zinc-900 dark:text-zinc-100">
            {intro.title}
          </h1>
          <p className="mt-1 text-zinc-500 dark:text-zinc-400">
            {intro.author}
          </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">
          {intro.cantos.map((canto) => {
            const totalVerses = canto.chapters.reduce(
              (sum, ch) => sum + ch.totalVerses,
              0,
            );
            return (
              <li key={canto.number}>
                <Link
                  href={`/books/sb/${canto.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">
                      Canto {canto.number}
                    </span>
                    <p className="font-medium text-zinc-900 dark:text-zinc-100">
                      {canto.title}
                    </p>
                  </div>
                  <span className="text-sm text-zinc-400 shrink-0 ml-4">
                    {canto.totalChapters} chapters ·{" "}
                    <ExtractedVerseCount
                      count={totalVerses}
                      label="extracted verses"
                    />
                  </span>
                </Link>
              </li>
            );
          })}
        </ul>
      </main>
    </div>
  );
}