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// app/blog/[slug]/page.tsx
import { Metadata } from 'next';

export async function generateMetadata({ params }: { params: { slug: string } }): Promise<Metadata> {
  const post = await fetchPostBySlug(params.slug);
  
  return {
    title: `${post.title} | My Indie App Dev Blog`,
    description: post.excerpt,
    openGraph: {
      title: post.title,
      description: post.excerpt,
      url: `https://example.com/blog/${params.slug}`,
      siteName: 'Indie Dev Blog',
      images: [
        {
          url: `https://example.com/api/og?title=${encodeURIComponent(post.title)}`,
          width: 1200,
          height: 630,
          alt: post.title,
        },
      ],
      locale: 'ja_JP',
      type: 'article',
      authors: ['Kenji'],
    },
    twitter: {
      card: 'summary_large_image',
      title: post.title,
      description: post.excerpt,
      creator: '@kenjinote',
    },
  };
}

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// app/blog/[slug]/page.tsx (元件內)
const jsonLd = {
  "@context": "https://schema.org",
  "@graph": [
    {
      "@type": "TechArticle",
      "headline": post.title,
      "image": [
        `https://example.com/api/og?title=${encodeURIComponent(post.title)}`
      ],
      "datePublished": post.publishedAt,
      "dateModified": post.updatedAt,
      "author": [{
          "@type": "Person",
          "name": "Kenji",
          "url": "https://example.com/about"
      }]
    },
    {
      "@type": "SoftwareApplication",
      "name": "My Awesome App",
      "operatingSystem": "Windows, macOS, Linux",
      "applicationCategory": "DeveloperApplication",
      "offers": {
        "@type": "Offer",
        "price": "0",
        "priceCurrency": "USD"
      }
    }
  ]
};

export default function BlogPost({ params }) {
  return (
    <article>
      <script
        type="application/ld+json"
        dangerouslySetInnerHTML={{ __html: JSON.stringify(jsonLd) }}
      />
      {/* 文章本文接續在此 */}
    </article>
  );
}

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// middleware.ts
import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';
import { get } from '@vercel/edge-config';

export const config = {
  matcher: '/blog/:slug*',
};

export async function middleware(request: NextRequest) {
  // 從 Edge Config 取得目前活躍的 A/B 測試變體
  const ctaExperiment = await get('cta_experiment_v1');
  let variant = request.cookies.get('cta_variant')?.value;

  // 如果變體未分配，則隨機分配
  if (!variant && ctaExperiment?.active) {
    variant = Math.random() < 0.5 ? 'A' : 'B';
  }

  // 建構 Rewrite 的目標 URL
  const url = request.nextUrl.clone();
  if (variant) {
    url.searchParams.set('variant', variant);
  }

  const response = NextResponse.rewrite(url);

  // 儲存到 Cookie，讓同一位使用者看到相同的變體
  if (variant && !request.cookies.has('cta_variant')) {
    response.cookies.set('cta_variant', variant, {
      maxAge: 60 * 60 * 24 * 30, // 30 days
      path: '/',
      sameSite: 'lax',
    });
  }

  return response;
}

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// components/CallToAction.tsx
'use client';

export default function CallToAction({ variant, appUrl }) {
  const handleCTAClick = () => {
    // 將事件推送 (push) 至 GA4 的 dataLayer
    if (typeof window !== 'undefined' && window.gtag) {
      window.gtag('event', 'generate_lead', {
        event_category: 'engagement',
        event_label: 'blog_bottom_cta',
        value: 1,
        ab_variant: variant,
      });
    }
  };

  return (
    <div className={`cta-container ${variant}`}>
      <h3>想試試看我開發的應用程式嗎？</h3>
      <a href={appUrl} onClick={handleCTAClick} className="btn-primary">
        立即下載
      </a>
    </div>
  );
}

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// PostHog 的初始化與事件追蹤範例
import posthog from 'posthog-js';

// 用戶端的初始化
if (typeof window !== 'undefined') {
  posthog.init('phc_YOUR_PROJECT_API_KEY', {
    api_host: 'https://app.posthog.com',
    loaded: (posthog) => {
      if (process.env.NODE_ENV === 'development') posthog.debug();
    }
  });
}

// 點擊 CTA 時的追蹤
export const trackAppDownload = (sourceId: string, variant: string) => {
  posthog.capture('app_download_clicked', {
    source_article: sourceId,
    ab_test_variant: variant,
    timestamp: new Date().toISOString()
  });
};