import Link from "next/link";
import { readMeta, listGroups } from "@/lib/store";
import type { FileRecord } from "@/lib/store";
import BrowseClient from "./BrowseClient";

function formatBytes(n: number) {
  if (n < 1024) return `${n} B`;
  if (n < 1024 * 1024) return `${(n / 1024).toFixed(1)} KB`;
  return `${(n / 1024 / 1024).toFixed(2)} MB`;
}

function TypeBadge({ type }: { type: FileRecord["type"] }) {
  return type === "backerup" ? (
    <span className="rounded-full bg-cyan-500/15 px-2.5 py-0.5 text-[11px] font-semibold text-cyan-400">
      .backerup
    </span>
  ) : (
    <span className="rounded-full bg-violet-500/15 px-2.5 py-0.5 text-[11px] font-semibold text-violet-400">
      .json config
    </span>
  );
}

export default async function BrowsePage({
  searchParams,
}: {
  searchParams: Promise<{ group?: string }>;
}) {
  const { group: selectedGroup } = await searchParams;
  const [allRecords, groups] = await Promise.all([readMeta(), listGroups()]);

  const records = selectedGroup
    ? allRecords.filter((r) => r.group === selectedGroup)
    : allRecords;

  return (
    <div className="mx-auto max-w-5xl px-6 py-16">
      <div className="mb-10 flex flex-wrap items-end justify-between gap-4">
        <div>
          <h1 className="text-3xl font-bold text-white">Browse shared files</h1>
          <p className="mt-2 text-slate-400">
            {records.length} file{records.length !== 1 ? "s" : ""}
            {selectedGroup ? ` in "${selectedGroup}"` : " shared by the community"}.
          </p>
        </div>
        <Link
          href="/share"
          className="rounded-xl bg-cyan-500 px-6 py-2.5 text-sm font-bold text-slate-900 hover:bg-cyan-400 transition-colors"
        >
          + Share a file
        </Link>
      </div>

      {/* Group filter bar */}
      {groups.length > 0 && (
        <BrowseClient groups={groups} selectedGroup={selectedGroup ?? null} />
      )}

      {records.length === 0 ? (
        <div className="rounded-2xl border border-slate-800 bg-slate-900/60 p-16 text-center">
          <p className="text-4xl">📭</p>
          <p className="mt-4 text-slate-400">
            {selectedGroup ? `No files in group "${selectedGroup}".` : "No files shared yet."}
          </p>
          <Link href="/share" className="mt-4 inline-block text-sm text-cyan-400 hover:underline">
            Be the first to share one →
          </Link>
        </div>
      ) : (
        <div className="grid gap-4 sm:grid-cols-2">
          {records.map((r) => (
            <Link
              key={r.token}
              href={`/files/${r.token}`}
              className="group rounded-2xl border border-slate-800 bg-slate-900/60 p-5 transition hover:border-slate-600 hover:bg-slate-900"
            >
              <div className="flex items-start justify-between gap-3">
                <div className="min-w-0 flex-1">
                  <div className="flex items-center gap-2 flex-wrap">
                    <TypeBadge type={r.type} />
                    {r.group && (
                      <span className="rounded-full bg-slate-700/60 px-2.5 py-0.5 text-[11px] font-medium text-slate-400">
                        {r.group}
                      </span>
                    )}
                    <span className="truncate font-mono text-xs text-slate-500">{r.originalName}</span>
                  </div>
                  {(r.displayName ?? r.containerName) && (
                    <p className="mt-2 font-semibold text-white truncate">
                      {r.displayName ?? r.containerName}
                    </p>
                  )}
                  {r.image && (
                    <p className="mt-0.5 text-xs text-slate-400 truncate">{r.image}</p>
                  )}
                  {r.description && (
                    <p className="mt-2 text-sm text-slate-400 line-clamp-2">{r.description}</p>
                  )}
                </div>
                <span className="shrink-0 text-slate-600 group-hover:text-slate-400 transition-colors text-lg">→</span>
              </div>
              <div className="mt-4 flex items-center gap-4 text-xs text-slate-600">
                <span>{formatBytes(r.size)}</span>
                <span>{new Date(r.uploadedAt).toLocaleDateString()}</span>
              </div>
            </Link>
          ))}
        </div>
      )}
    </div>
  );
}