import fs from "fs";
import path from "path";
import Link from "next/link";

function formatTitle(filename: string) {
  return filename
    .replace(/\.RTF$/i, "")
    .replace(/-/g, " ")
    .replace(/\b\w/g, (c) => c.toUpperCase());
}

function formatSize(bytes: number) {
  if (bytes < 1024) return `${bytes} B`;
  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
  return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
}

export default function Home() {
  const rtfDir = path.join(process.cwd(), "public/rtfs");
  const files = fs.readdirSync(rtfDir).filter((f) => /\.rtf$/i.test(f));

  const fileList = files.map((f) => {
    const stat = fs.statSync(path.join(rtfDir, f));
    return {
      filename: f,
      slug: f.replace(/\.RTF$/i, ""),
      title: formatTitle(f),
      size: stat.size,
    };
  });

  fileList.sort((a, b) => a.title.localeCompare(b.title));

  return (
    <div className="min-h-screen bg-zinc-50 dark:bg-zinc-950">
      <header className="border-b border-zinc-200 dark:border-zinc-800 bg-white dark:bg-zinc-900 px-6 py-8">
        <div className="max-w-3xl mx-auto">
          <h1 className="text-2xl font-bold text-zinc-900 dark:text-zinc-100">
            RTF Document Viewer
          </h1>
          <p className="mt-1 text-zinc-500 dark:text-zinc-400">
            {files.length} documents available
          </p>
        </div>
      </header>
      <main className="max-w-3xl mx-auto px-6 py-8">
        <ul className="divide-y divide-zinc-200 dark:divide-zinc-800 bg-white dark:bg-zinc-900 rounded-lg border border-zinc-200 dark:border-zinc-800 overflow-hidden">
          {fileList.map((file) => (
            <li key={file.slug}>
              <Link
                href={`/view/${file.slug}`}
                className="flex items-center justify-between px-5 py-4 hover:bg-zinc-50 dark:hover:bg-zinc-800 transition-colors"
              >
                <span className="font-medium text-zinc-900 dark:text-zinc-100">
                  {file.title}
                </span>
                <span className="text-sm text-zinc-400 dark:text-zinc-500 shrink-0 ml-4">
                  {formatSize(file.size)}
                </span>
              </Link>
            </li>
          ))}
        </ul>
      </main>
    </div>
  );
}