import { Metadata } from "next";
import Link from "next/link";
import { getTranslations } from "next-intl/server";
import { ChevronRight, Droplets } from "lucide-react";
import Header from "@/components/layout/Header";
import Footer from "@/components/layout/Footer";
import { getAllOilForConcernPages, getLocalizedString, getAllOils } from "@/lib/programmatic-seo/dataLoader";
import { isValidLocale, DEFAULT_LOCALE } from "@/lib/i18n/locales";

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

export async function generateMetadata({
  params,
}: {
  params: Params;
}): Promise<Metadata> {
  const { locale } = await params;
  const validLocale = isValidLocale(locale) ? locale : DEFAULT_LOCALE;
  const t = await getTranslations({ locale: validLocale, namespace: "Solutions.ByOil" });
  
  const baseUrl = process.env.NEXT_PUBLIC_SITE_URL || "https://manoonoils.com";
  const localePrefix = `/${validLocale}`;
  const canonicalUrl = `${baseUrl}${localePrefix}/solutions/by-oil`;

  return {
    title: t("metaTitle"),
    description: t("metaDescription"),
    alternates: {
      canonical: canonicalUrl,
    },
    openGraph: {
      url: canonicalUrl,
    },
  };
}

interface OilCardProps {
  oilName: string;
  concernCount: number;
  concerns: string[];
  locale: string;
  firstSolutionSlug: string;
  bestFor: string;
  exploreSolutions: string;
  solutionLabel: string;
  solutionsLabel: string;
  shortDescription: string;
}

function OilCard({ 
  oilName, 
  concernCount, 
  concerns, 
  locale, 
  firstSolutionSlug,
  bestFor,
  exploreSolutions,
  solutionLabel,
  solutionsLabel,
  shortDescription,
}: OilCardProps) {
  return (
    <div className="border border-[#e5e5e5] rounded-lg p-6 hover:border-black transition-colors group flex flex-col">
      <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 flex-grow">
        {shortDescription}
      </p>
      
      <p className="text-sm text-[#666666] mb-4">
        {concernCount} {concernCount === 1 ? solutionLabel : solutionsLabel}
      </p>
      
      <div className="space-y-2 mb-4">
        <p className="text-xs uppercase tracking-wider text-[#999999] font-medium">
          {bestFor}
        </p>
        {concerns.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>
        ))}
        {concerns.length > 3 && (
          <p className="text-xs text-[#999999]">
            +{concerns.length - 3} more
          </p>
        )}
      </div>
      
      <Link
        href={`/${locale}/solutions/${firstSolutionSlug}`}
        className="inline-flex items-center text-sm font-medium text-[#1a1a1a] group-hover:text-black transition-colors mt-auto"
      >
        {exploreSolutions}
        <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 [oils, allPages] = await Promise.all([
    getAllOils(),
    getAllOilForConcernPages(),
  ]);
  
  const oilsWithPages = oils
    .map(oil => {
      const pages = allPages.filter(page => page.oilId === oil.id);
      return {
        ...oil,
        pages,
        concernCount: pages.length,
      };
    })
    .filter(oil => oil.pages.length > 0)
    .sort((a, b) => a.name[locale as "sr" | "en" | "de" | "fr"].localeCompare(b.name[locale as "sr" | "en" | "de" | "fr"]));

  return (
    <>
      <Header locale={locale} hideLangSwitcher={true} />
      <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: oilsWithPages.length })}
                  </p>
                  <p className="text-sm text-[#666666]">
                    {pageT("stats.totalSolutions", { count: allPages.length })}
                  </p>
                </div>
              </div>
            </div>

            <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
              {oilsWithPages.map((oil) => {
                const oilName = getLocalizedString(oil.name, locale);
                const shortDescription = getLocalizedString(oil.shortDescription, locale);
                const concerns = oil.pages.map(p => getLocalizedString(p.concernName, locale));
                
                return (
                  <OilCard
                    key={oil.id}
                    oilName={oilName}
                    concernCount={oil.concernCount}
                    concerns={concerns}
                    locale={locale}
                    firstSolutionSlug={oil.pages[0].localizedSlugs[locale as "sr" | "en" | "de" | "fr"]}
                    bestFor={pageT("oilCard.bestFor")}
                    exploreSolutions={pageT("oilCard.exploreSolutions")}
                    solutionLabel={pageT("oilCard.solutionLabel")}
                    solutionsLabel={pageT("oilCard.solutionsLabel")}
                    shortDescription={shortDescription}
                  />
                );
              })}
            </div>

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