import { Metadata } from "next";
import Link from "next/link";
import { getTranslations } from "next-intl/server";
import { ChevronRight, Droplets } from "lucide-react";
import { getAllOilForConcernPages, getLocalizedString } from "@/lib/programmatic-seo/dataLoader";

type Params = Promise<{ locale: string }>;

export async function generateMetadata({
  params,
}: {
  params: Params;
}): Promise<Metadata> {
  const { locale } = await params;
  const t = await getTranslations({ locale, namespace: "Solutions.ByOil" });

  return {
    title: t("metaTitle"),
    description: t("metaDescription"),
  };
}

function groupByOil(pages: Awaited<ReturnType<typeof getAllOilForConcernPages>>) {
  const oils = new Map<string, typeof pages>();

  pages.forEach((page) => {
    const oilSlug = page.oilSlug;
    if (!oils.has(oilSlug)) {
      oils.set(oilSlug, []);
    }
    oils.get(oilSlug)?.push(page);
  });

  return oils;
}

interface OilCardProps {
  oilSlug: string;
  oilName: string;
  concernCount: number;
  topConcerns: string[];
  locale: string;
}

function OilCard({ oilSlug, oilName, concernCount, topConcerns, locale }: OilCardProps) {
  return (
    <div className="border border-[#e5e5e5] rounded-lg p-6 hover:border-black transition-colors group">
      <div className="flex items-center gap-3 mb-4">
        <div className="w-10 h-10 rounded-full bg-amber-100 flex items-center justify-center">
          <Droplets className="w-5 h-5 text-amber-700" />
        </div>
        <h3 className="text-lg font-medium text-[#1a1a1a]">
          {oilName}
        </h3>
      </div>
      <p className="text-sm text-[#666666] mb-4">
        {concernCount} {concernCount === 1 ? "concern solution" : "concern solutions"} available
      </p>
      <div className="space-y-2 mb-4">
        <p className="text-xs uppercase tracking-wider text-[#999999] font-medium">
          Best for:
        </p>
        {topConcerns.slice(0, 3).map((concernName) => (
          <div key={concernName} className="flex items-center gap-2 text-sm text-[#666666]">
            <div className="w-1.5 h-1.5 rounded-full bg-emerald-400" />
            {concernName}
          </div>
        ))}
      </div>
      <Link
        href={`/${locale}/solutions/by-oil/${oilSlug}`}
        className="inline-flex items-center text-sm font-medium text-[#1a1a1a] group-hover:text-black transition-colors"
      >
        Explore Oil Solutions
        <ChevronRight className="ml-1 w-4 h-4 transform group-hover:translate-x-1 transition-transform" />
      </Link>
    </div>
  );
}

export default async function ByOilPage({
  params,
}: {
  params: Params;
}) {
  const { locale } = await params;
  const t = await getTranslations({ locale, namespace: "Solutions" });
  const pageT = await getTranslations({ locale, namespace: "Solutions.ByOil" });

  const pages = await getAllOilForConcernPages();
  const oilsMap = groupByOil(pages);

  const oilsList = Array.from(oilsMap.entries())
    .map(([slug, pages]) => ({
      slug,
      name: getLocalizedString(pages[0].oilName, locale),
      concernCount: pages.length,
      topConcerns: pages.slice(0, 3).map((p) => getLocalizedString(p.concernName, locale)),
    }))
    .sort((a, b) => a.name.localeCompare(b.name));

  return (
    <div className="min-h-screen bg-white">
      <section className="pt-32 pb-16 lg:pt-40 lg:pb-24">
        <div className="container">
          <nav className="flex items-center gap-2 text-sm text-[#666666] mb-8">
            <Link href={`/${locale}`} className="hover:text-black transition-colors">
              {t("breadcrumb.home")}
            </Link>
            <ChevronRight className="w-4 h-4" />
            <Link href={`/${locale}/solutions`} className="hover:text-black transition-colors">
              {t("breadcrumb.solutions")}
            </Link>
            <ChevronRight className="w-4 h-4" />
            <span className="text-[#1a1a1a]">{t("breadcrumb.byOil")}</span>
          </nav>

          <div className="max-w-3xl mb-12">
            <h1 className="text-4xl lg:text-5xl font-medium tracking-tight text-[#1a1a1a] mb-6">
              {pageT("title")}
            </h1>
            <p className="text-lg text-[#666666] leading-relaxed">
              {pageT("subtitle")}
            </p>
          </div>

          <div className="bg-gradient-to-r from-amber-50 to-emerald-50 border border-[#e5e5e5] rounded-lg p-6 mb-12">
            <div className="flex items-center gap-4">
              <div className="w-12 h-12 rounded-full bg-white flex items-center justify-center shadow-sm">
                <Droplets className="w-6 h-6 text-amber-600" />
              </div>
              <div>
                <p className="text-sm text-[#666666]">
                  {pageT("stats.availableOils", { count: oilsList.length })}
                </p>
                <p className="text-sm text-[#666666]">
                  {pageT("stats.totalSolutions", { count: pages.length })}
                </p>
              </div>
            </div>
          </div>

          <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
            {oilsList.map((oil) => (
              <OilCard
                key={oil.slug}
                oilSlug={oil.slug}
                oilName={oil.name}
                concernCount={oil.concernCount}
                topConcerns={oil.topConcerns}
                locale={locale}
              />
            ))}
          </div>

          {oilsList.length === 0 && (
            <div className="text-center py-16">
              <p className="text-[#666666]">{pageT("noResults")}</p>
            </div>
          )}
        </div>
      </section>
    </div>
  );
}