// ISR: revalidate every 60s — see /[locale]/page.tsx for the full rationale.
export const revalidate = 60;

import type { Metadata } from "next";
import Link from "next/link";
import fs from "fs";
import path from "path";
import { prisma } from "@/lib/prisma";
import { notFound } from "next/navigation";
import ApplicationClient from "./ApplicationClient";

import { setRequestLocale } from "next-intl/server";
import { getLocalizedData } from "@/lib/i18nHelper";
import {
  buildPageMetadata,
  productSchema,
  breadcrumbSchema,
  baseUrl,
} from "@/lib/seo";
import JsonLd from "@/components/seo/JsonLd";

// --- FUNCIÓN ORIGINAL PARA LEER IMÁGENES LOCALES ---
function getApplicationImages(slug: string) {
  let blueprints: string[] = [];
  let machines: string[] = [];
  let heroImage = "";

  try {
    const imagesDir = path.join(process.cwd(), "public", "applications", slug);

    if (fs.existsSync(imagesDir)) {
      const files = fs.readdirSync(imagesDir).filter((file) => /\.(png|jpe?g|webp)$/i.test(file));

      heroImage = files[0] ? `/applications/${slug}/${files[0]}` : "";
      blueprints = files
        .filter((f) => f.includes("Screenshot") || f.startsWith("P10") || f.includes("blueprint"))
        .slice(0, 3)
        .map((f) => `/applications/${slug}/${f}`);
      machines = files
        .filter((f) => !f.includes("Screenshot") && !f.startsWith("P10") && !f.includes("blueprint"))
        .slice(1, 4)
        .map((f) => `/applications/${slug}/${f}`);
    }
  } catch (error) {
    console.error(`[applications/${slug}] Image scan failed:`, error);
  }

  return { heroImage, blueprints, machines };
}

// ── Per-page metadata (Open Graph, Twitter, hreflang, canonical) ───────────
export async function generateMetadata({
  params,
}: {
  params: Promise<{ slug: string; locale: string }>;
}): Promise<Metadata> {
  try {
    const { slug, locale } = await params;
    const raw = await prisma.application.findUnique({ where: { slug } });
    if (!raw) {
      return {
        title: "Application not found | FLUX",
        robots: { index: false, follow: false },
      };
    }

    const data: any = getLocalizedData(raw, locale);
    const heroImage = getApplicationImages(slug).heroImage;
    const title = data?.title || "Application";
    const description = data?.shortDescription || data?.subtitle || "FLUX RF industrial solutions.";

    return buildPageMetadata({
      locale,
      pathWithoutLocale: `applications/${slug}`,
      title: `${title} — RF Industrial Solutions | FLUX`,
      description,
      ogImageUrl: heroImage || undefined,
      type: "product",
    });
  } catch (error) {
    console.error("[applications generateMetadata]", error);
    return { title: "FLUX | Energy, Directed." };
  }
}

// Pre-render all known application slugs at build time. New slugs added
// after deploy render on-demand and get cached by ISR (revalidate=60).
// try/catch ensures the build never fails if the DB is unreachable
// during docker build — pages just render on first request instead.
export async function generateStaticParams() {
  try {
    const apps = await prisma.application.findMany({
      select: { slug: true },
    });
    return apps.map((app) => ({ slug: app.slug }));
  } catch {
    return [];
  }
}

// 🔥 AHORA RECIBIMOS EL LOCALE DESDE LA URL
export default async function ApplicationPage({ params }: { params: Promise<{ slug: string, locale: string }> }) {
  const resolvedParams = await params;
  const { slug, locale } = resolvedParams;
  setRequestLocale(locale);

  // 1. Buscamos la Teoría General de la Aplicación
  let rawData: any = null;
  try {
    rawData = await prisma.application.findUnique({ where: { slug } });
  } catch (error) {
    console.error(`[applications/${slug}] DB error fetching application:`, error);
  }

  if (!rawData) {
    return (
      <div className="min-h-screen flex flex-col items-center justify-center bg-[#F5F5F7] dark:bg-[#050505]">
        <h1 className="text-2xl text-[#86868B] mb-4">Application not found in Database</h1>
        <Link href={`/${locale}/#applications-deep`} className="text-[#00F0FF] hover:underline">Return Home</Link>
      </div>
    );
  }

  // 🔥 TRADUCIMOS LA APLICACIÓN PRINCIPAL
  let data: any;
  try {
    data = getLocalizedData(rawData, locale);
  } catch (error) {
    console.error(`[applications/${slug}] Locale merge failed:`, error);
    data = rawData;
  }

  // 2. Buscamos el "Muro de Soluciones" (Casos Reales específicos de esta app)
  let rawRealCases: any[] = [];
  try {
    rawRealCases = await prisma.globalNode.findMany({
      where: {
        application: slug,
        isActive: true,
        projectOverview: { not: null },
      },
      orderBy: { createdAt: "desc" },
    });
  } catch (error) {
    console.error(`[applications/${slug}] DB error fetching cases:`, error);
  }

  // 🔥 TRADUCIMOS TODOS LOS CASOS DE ESTUDIO DEL MURO
  let realCases: any[] = [];
  try {
    realCases = rawRealCases.map((node: any) => getLocalizedData(node, locale));
  } catch (error) {
    console.error(`[applications/${slug}] Cases locale merge failed:`, error);
    realCases = rawRealCases;
  }

  // 3. Leemos las imágenes de la carpeta original
  const images = getApplicationImages(slug);

  // 4. JSON-LD structured data — wrapped to never break the render.
  const appTitle = data?.title || "FLUX Application";
  const appUrl = `${baseUrl()}/${locale}/applications/${slug}`;
  const crumbs = [
    { name: "Home", url: `/${locale}` },
    { name: "Applications", url: `/${locale}#applications-deep` },
    { name: appTitle, url: `/${locale}/applications/${slug}` },
  ];

  let jsonLd: object[] = [];
  try {
    const description = data?.shortDescription || data?.subtitle || "";
    jsonLd = [
      productSchema({
        name: appTitle,
        description,
        imageUrl: images.heroImage || undefined,
        category: data?.category || "RF Industrial",
        url: appUrl,
      }),
      breadcrumbSchema(
        crumbs.map((c) => ({ name: c.name, url: `${baseUrl()}${c.url}` }))
      ),
    ];
  } catch (error) {
    console.error(`[applications/${slug}] JSON-LD build failed:`, error);
  }

  return (
    <>
      {jsonLd.length > 0 && <JsonLd data={jsonLd} />}
      <ApplicationClient data={data} realCases={realCases} images={images} breadcrumbs={crumbs} />
    </>
  );
}