import type { Metadata } from 'next';
import { notFound } from 'next/navigation';
import { AgentProfileClient } from '@/components/agents/agent-profile-client';
import {
  JsonLd,
  generateAgentJsonLd,
  generateBreadcrumbJsonLd,
} from '@/components/seo/json-ld';
import {
  fetchAgentProfile,
  fetchAgentReviews,
  fetchAgentListings,
} from '@/lib/agents-server';

// ---------------------------------------------------------------------------
// Constants
// ---------------------------------------------------------------------------

const siteUrl = process.env['NEXT_PUBLIC_SITE_URL'] || 'https://goodgo.vn';

// ---------------------------------------------------------------------------
// Metadata (runs server-side, provides <title>, <meta>, OG, canonical)
// ---------------------------------------------------------------------------

interface PageProps {
  params: Promise<{ locale: string; id: string }>;
}

export async function generateMetadata({ params: paramsPromise }: PageProps): Promise<Metadata> {
  const params = await paramsPromise;
  const agent = await fetchAgentProfile(params.id);
  if (!agent) {
    return { title: 'Không tìm thấy môi giới' };
  }

  const title = agent.isVerified
    ? `${agent.fullName} — Môi giới xác minh | GoodGo`
    : `${agent.fullName} — Môi giới BĐS | GoodGo`;

  const description = [
    agent.agency ? `Công ty: ${agent.agency}` : null,
    agent.serviceAreas.length > 0
      ? `Khu vực: ${agent.serviceAreas.join(', ')}`
      : null,
    agent.totalReviews > 0
      ? `Đánh giá: ${agent.avgReviewRating}/5 (${agent.totalReviews} lượt)`
      : null,
    `${agent.activeListings.length} tin đăng đang hoạt động`,
    `${agent.totalDeals} giao dịch thành công`,
  ]
    .filter(Boolean)
    .join(' | ');

  const canonicalUrl = `${siteUrl}/${params.locale}/agents/${params.id}`;

  return {
    title,
    description,
    alternates: {
      canonical: canonicalUrl,
      languages: {
        vi: `${siteUrl}/vi/agents/${params.id}`,
        en: `${siteUrl}/en/agents/${params.id}`,
      },
    },
    openGraph: {
      type: 'profile',
      locale: params.locale === 'vi' ? 'vi_VN' : 'en_US',
      url: canonicalUrl,
      title,
      description,
      siteName: 'GoodGo',
      images: agent.avatarUrl
        ? [{ url: agent.avatarUrl, width: 400, height: 400, alt: agent.fullName }]
        : [{ url: '/og-image.png', width: 1200, height: 630, alt: 'GoodGo' }],
    },
    twitter: {
      card: 'summary',
      title,
      description,
      images: agent.avatarUrl ? [agent.avatarUrl] : ['/og-image.png'],
    },
  };
}

// ---------------------------------------------------------------------------
// Page (Server Component)
// ---------------------------------------------------------------------------

export default async function AgentProfilePage({ params: paramsPromise }: PageProps) {
  const params = await paramsPromise;
  const [agent, reviewsResult, listingsResult] = await Promise.all([
    fetchAgentProfile(params.id),
    fetchAgentReviews(params.id, 1, 10),
    fetchAgentListings(params.id, 1, 50),
  ]);

  if (!agent) {
    notFound();
  }

  // Build JSON-LD structured data
  const agentJsonLd = generateAgentJsonLd(agent, siteUrl);
  const breadcrumbJsonLd = generateBreadcrumbJsonLd([
    { name: 'Trang chủ', url: siteUrl },
    { name: 'Môi giới', url: `${siteUrl}/${params.locale}/agents` },
    { name: agent.fullName, url: `${siteUrl}/${params.locale}/agents/${params.id}` },
  ]);

  return (
    <>
      {/* Structured data for search engines */}
      <JsonLd data={agentJsonLd} />
      <JsonLd data={breadcrumbJsonLd} />

      {/* Interactive client component */}
      <AgentProfileClient
        agent={agent}
        reviews={reviewsResult.data}
        listings={listingsResult.data}
        listingsTotal={listingsResult.total}
      />
    </>
  );
}