import Link from "next/link";
import { Suspense } from "react";
import Shell from "./components/shell";
import LogoImg from "./components/logo-img";
import { withLogoUrl } from "@/lib/logo";
import { getDb } from "@/lib/db";
import { getVoucherStatus, type VoucherStatus } from "@/lib/voucher-status";
import { formatEuro, isExpiringSoon } from "@/lib/vouchers";

const FILTERS = [
  { key: "", label: "Alle" },
  { key: "aktiv", label: "Aktiv" },
  { key: "bald", label: "Bald ablaufend" },
  { key: "abgelaufen", label: "Abgelaufen" },
  { key: "eingeloest", label: "Eingelöst" },
] as const;

const STATUS_STYLE: Record<VoucherStatus, string> = {
  aktiv: "bg-brand-50 text-brand-800",
  abgelaufen: "bg-danger/10 text-danger",
  eingeloest: "bg-wash text-muted",
};

function statusLabel(s: VoucherStatus) {
  if (s === "aktiv") return "Aktiv";
  if (s === "abgelaufen") return "Abgelaufen";
  return "Eingelöst";
}

function Skeleton() {
  return (
    <ul aria-label="lädt" className="grid gap-3">
      {[0, 1, 2].map((i) => (
        <li key={i} className="animate-pulse rounded-card border border-line bg-white p-5">
          <div className="h-4 w-1/3 rounded bg-line" />
          <div className="mt-2 h-3 w-1/4 rounded bg-wash" />
        </li>
      ))}
    </ul>
  );
}

async function VoucherList({ filter }: { filter: string }) {
  const db = getDb();
  const all = await db.voucher.findMany({ orderBy: { createdAt: "desc" } });
  const filtered = all.filter((v) => {
    const s = getVoucherStatus(v);
    if (filter === "eingeloest") return s === "eingeloest";
    if (filter === "abgelaufen") return s === "abgelaufen";
    if (filter === "bald") return s === "aktiv" && isExpiringSoon(v.ablaufdatum);
    if (filter === "aktiv") return s === "aktiv";
    return true;
  });
  const withLogos = await Promise.all(filtered.map(withLogoUrl));
  if (filtered.length === 0) {
    return (
      <div className="rounded-card border border-line bg-white p-10 text-center">
        <p className="text-sm text-muted">Keine Gutscheine gefunden.</p>
        <Link
          href="/vouchers/new"
          className="mt-4 inline-block rounded-field bg-brand-600 px-4 py-2.5 text-sm font-semibold text-white transition-colors hover:bg-brand-700"
        >
          Gutschein anlegen
        </Link>
      </div>
    );
  }
  return (
    <ul className="grid gap-3">
      {withLogos.map((v) => {
        const s = getVoucherStatus(v);
        return (
          <li key={v.id} className="rounded-card border border-line bg-white p-5 transition-shadow hover:shadow-[0_8px_24px_rgba(32,55,39,0.08)]">
            <div className="flex items-center gap-3">
              <LogoImg logoUrl={v.logoUrl ?? null} name={v.anbieter} />
              <div className="flex min-w-0 flex-1 items-start justify-between gap-3">
                <div className="min-w-0">
                  <Link href={`/vouchers/${v.id}`} className="text-[15px] font-semibold tracking-tight hover:text-brand-700">
                    {v.name}
                  </Link>
                  <p className="mt-1 text-sm text-muted">
                    {v.anbieter} · {formatEuro(v.restCents)} von {formatEuro(v.wertCents)}
                    {v.ablaufdatum ? ` · bis ${v.ablaufdatum.toLocaleDateString("de-DE")}` : ""}
                  </p>
                  <p className="mt-0.5 text-[13px] text-muted">
                    {v.createdBy ? `Angelegt von ${v.createdBy}` : "Ersteller nicht erfasst"}
                  </p>
                </div>
                <span className={`shrink-0 rounded-full px-2.5 py-1 text-xs font-semibold ${STATUS_STYLE[s]}`}>
                  {statusLabel(s)}
                </span>
              </div>
            </div>
          </li>
        );
      })}
    </ul>
  );
}

export default async function Home({ searchParams }: { searchParams: Promise<{ filter?: string }> }) {
  const { filter = "" } = await searchParams;
  return (
    <Shell>
      <div className="mb-5 flex items-end justify-between gap-3">
        <div>
          <h1 className="text-2xl font-semibold tracking-tight">Gutscheine</h1>
          <p className="mt-1 text-sm text-muted">Alle Gutscheine eures Haushalts im Blick.</p>
        </div>
        <Link
          href="/vouchers/new"
          className="shrink-0 rounded-field bg-brand-600 px-4 py-2.5 text-sm font-semibold text-white transition-colors hover:bg-brand-700"
        >
          Neu
        </Link>
      </div>
      <nav className="mb-5 flex flex-wrap gap-2" aria-label="Filter">
        {FILTERS.map((f) => (
          <Link
            key={f.key}
            href={f.key ? `/?filter=${f.key}` : "/"}
            aria-current={filter === f.key ? "page" : undefined}
            className={`rounded-full border px-3.5 py-1.5 text-[13px] font-medium transition-colors ${
              filter === f.key
                ? "border-brand-700 bg-brand-600 text-white"
                : "border-line bg-white text-ink hover:border-brand-600 hover:text-brand-700"
            }`}
          >
            {f.label}
          </Link>
        ))}
      </nav>
      <Suspense fallback={<Skeleton />}>
        <VoucherList filter={filter} />
      </Suspense>
    </Shell>
  );
}