import { setRequestLocale } from 'next-intl/server';
import { getTranslations } from 'next-intl/server';
import { ArrowRight } from 'lucide-react';
import type { Metadata } from 'next';
import { getAllBlogPosts, BlogPost } from '@/lib/blog';
import { BlogList } from '@/components/blog/BlogList';

type Props = {
  params: Promise<{ locale: string }>;
};

// Legacy blog posts with translations (these have manual translations)
const legacyBlogPosts: Record<string, BlogPost[]> = {
  de: [
    {
      slug: 'n8n-automatisierung-tutorial',
      title: 'n8n Tutorial: Workflows automatisieren ohne Code - Schritt für Schritt',
      date: '2026-01-18',
      excerpt: 'Lernen Sie, wie Sie mit n8n leistungsstarke Automatisierungen erstellen. Von der Installation bis zum ersten produktiven Workflow - inklusive Best Practices.',
      category: 'Automatisierung',
      tags: ['n8n', 'Tutorial', 'Automatisierung', 'Workflow', 'No-Code', 'Self-Hosted'],
      coverImage: '/images/posts/n8n-automatisierung-tutorial/cover.jpg',
    },
    {
      slug: 'geo-generative-engine-optimization',
      title: 'GEO: Generative Engine Optimization - SEO für die KI-Ära',
      date: '2026-01-17',
      excerpt: 'Wie Sie Ihre Inhalte für ChatGPT, Perplexity und andere KI-Suchmaschinen optimieren. Der neue Standard nach klassischem SEO.',
      category: 'Marketing',
      tags: ['GEO', 'SEO', 'KI', 'ChatGPT', 'Perplexity', 'Content Marketing', 'AEO'],
      coverImage: '/images/posts/geo-generative-engine-optimization/cover.jpg',
    },
    {
      slug: 'gpt-api-integration-praxisguide',
      title: 'GPT API Integration: Vom API-Key zur produktionsreifen Anwendung',
      date: '2026-01-16',
      excerpt: 'Praktische Anleitung zur Integration von OpenAI GPT-4 in Ihre Anwendungen. Token-Optimierung, Fehlerbehandlung und Best Practices.',
      category: 'KI-Entwicklung',
      tags: ['GPT-4', 'OpenAI', 'API', 'Integration', 'Python', 'LLM', 'Prompt Engineering'],
      coverImage: '/images/posts/gpt-api-integration-praxisguide/cover.jpg',
    },
    {
      slug: 'ki-agenten-unternehmen-guide',
      title: 'KI-Agenten für Unternehmen: Der ultimative Praxisguide 2026',
      date: '2026-01-15',
      excerpt: 'Wie Unternehmen KI-Agenten einsetzen können, um Prozesse zu automatisieren, Kosten zu senken und Wettbewerbsvorteile zu gewinnen.',
      category: 'KI-Entwicklung',
      tags: ['KI-Agenten', 'Automatisierung', 'GPT-4', 'Claude', 'LLM', 'Unternehmen'],
      coverImage: '/images/posts/ki-agenten-unternehmen-guide/cover.jpg',
    },
    {
      slug: 'n8n-make-zapier-vergleich',
      title: 'n8n vs Make vs Zapier: Welches Automatisierungstool passt zu Ihnen?',
      date: '2026-01-10',
      excerpt: 'Ein detaillierter Vergleich der führenden Workflow-Automatisierungstools mit Vor- und Nachteilen für verschiedene Anwendungsfälle.',
      category: 'Automatisierung',
      tags: ['n8n', 'Make', 'Zapier', 'Workflow', 'Automatisierung', 'No-Code'],
      coverImage: '/images/posts/n8n-make-zapier-vergleich/cover.jpg',
    },
    {
      slug: 'voice-ai-kundenservice-trends',
      title: 'Voice AI im Kundenservice: Trends und Best Practices 2026',
      date: '2026-01-05',
      excerpt: 'Wie Voice AI den Kundenservice revolutioniert und welche Technologien Sie für Ihr Unternehmen evaluieren sollten.',
      category: 'Voice AI',
      tags: ['Voice AI', 'Sprachassistent', 'Kundenservice', 'NLP', 'Chatbot', 'Vapi'],
      coverImage: '/images/posts/voice-ai-kundenservice-trends/cover.jpg',
    },
    {
      slug: 'saas-mvp-entwicklung-4-wochen',
      title: 'SaaS MVP in 4 Wochen: Von der Idee zum Launch',
      date: '2025-12-20',
      excerpt: 'Schritt-für-Schritt Anleitung zur schnellen Entwicklung eines SaaS MVP mit Next.js, Prisma und modernen Cloud-Diensten.',
      category: 'SaaS-Entwicklung',
      tags: ['SaaS', 'MVP', 'Next.js', 'Startup', 'Produktentwicklung', 'React'],
      coverImage: '/images/posts/saas-mvp-entwicklung-4-wochen/cover.jpg',
    },
    {
      slug: 'erp-integration-breuninger',
      title: 'ApparelMagic und TradeByte: Analyse komplexer Integrationen',
      date: '2024-02-09',
      excerpt: 'Detaillierte Analyse einer E-Commerce-Integration zwischen Apparel Magic und Breuninger via TradeByte',
      category: 'System Integration',
      tags: ['ERP', 'Apparel Magic', 'TradeByte', 'API Integration', 'Python', 'MariaDB'],
      coverImage: '/images/posts/erp-integration-breuninger/cover.jpg',
    },
  ],
  en: [
    {
      slug: 'n8n-automatisierung-tutorial',
      title: 'n8n Tutorial: Automate Workflows Without Code - Step by Step',
      date: '2026-01-18',
      excerpt: 'Learn how to create powerful automations with n8n. From installation to your first production workflow - including best practices.',
      category: 'Automation',
      tags: ['n8n', 'Tutorial', 'Automation', 'Workflow', 'No-Code', 'Self-Hosted'],
      coverImage: '/images/posts/n8n-automatisierung-tutorial/cover.jpg',
    },
    {
      slug: 'geo-generative-engine-optimization',
      title: 'GEO: Generative Engine Optimization - SEO for the AI Era',
      date: '2026-01-17',
      excerpt: 'How to optimize your content for ChatGPT, Perplexity and other AI search engines. The new standard after traditional SEO.',
      category: 'Marketing',
      tags: ['GEO', 'SEO', 'AI', 'ChatGPT', 'Perplexity', 'Content Marketing', 'AEO'],
      coverImage: '/images/posts/geo-generative-engine-optimization/cover.jpg',
    },
    {
      slug: 'gpt-api-integration-praxisguide',
      title: 'GPT API Integration: From API Key to Production-Ready Application',
      date: '2026-01-16',
      excerpt: 'Practical guide to integrating OpenAI GPT-4 into your applications. Token optimization, error handling and best practices.',
      category: 'AI Development',
      tags: ['GPT-4', 'OpenAI', 'API', 'Integration', 'Python', 'LLM', 'Prompt Engineering'],
      coverImage: '/images/posts/gpt-api-integration-praxisguide/cover.jpg',
    },
    {
      slug: 'ki-agenten-unternehmen-guide',
      title: 'AI Agents for Business: The Ultimate Practical Guide 2026',
      date: '2026-01-15',
      excerpt: 'How companies can use AI agents to automate processes, reduce costs and gain competitive advantages.',
      category: 'AI Development',
      tags: ['AI Agents', 'Automation', 'GPT-4', 'Claude', 'LLM', 'Enterprise'],
      coverImage: '/images/posts/ki-agenten-unternehmen-guide/cover.jpg',
    },
    {
      slug: 'n8n-make-zapier-vergleich',
      title: 'n8n vs Make vs Zapier: Which Automation Tool is Right for You?',
      date: '2026-01-10',
      excerpt: 'A detailed comparison of leading workflow automation tools with pros and cons for different use cases.',
      category: 'Automation',
      tags: ['n8n', 'Make', 'Zapier', 'Workflow', 'Automation', 'No-Code'],
      coverImage: '/images/posts/n8n-make-zapier-vergleich/cover.jpg',
    },
    {
      slug: 'voice-ai-kundenservice-trends',
      title: 'Voice AI in Customer Service: Trends and Best Practices 2026',
      date: '2026-01-05',
      excerpt: 'How Voice AI is revolutionizing customer service and which technologies you should evaluate for your business.',
      category: 'Voice AI',
      tags: ['Voice AI', 'Voice Assistant', 'Customer Service', 'NLP', 'Chatbot', 'Vapi'],
      coverImage: '/images/posts/voice-ai-kundenservice-trends/cover.jpg',
    },
    {
      slug: 'saas-mvp-entwicklung-4-wochen',
      title: 'SaaS MVP in 4 Weeks: From Idea to Launch',
      date: '2025-12-20',
      excerpt: 'Step-by-step guide to quickly developing a SaaS MVP with Next.js, Prisma and modern cloud services.',
      category: 'SaaS Development',
      tags: ['SaaS', 'MVP', 'Next.js', 'Startup', 'Product Development', 'React'],
      coverImage: '/images/posts/saas-mvp-entwicklung-4-wochen/cover.jpg',
    },
    {
      slug: 'erp-integration-breuninger',
      title: 'ApparelMagic and TradeByte: Complex Integration Analysis',
      date: '2024-02-09',
      excerpt: 'Detailed analysis of an e-commerce integration between Apparel Magic and Breuninger via TradeByte',
      category: 'System Integration',
      tags: ['ERP', 'Apparel Magic', 'TradeByte', 'API Integration', 'Python', 'MariaDB'],
      coverImage: '/images/posts/erp-integration-breuninger/cover.jpg',
    },
  ],
  sr: [
    {
      slug: 'n8n-automatisierung-tutorial',
      title: 'n8n Tutorial: Automatizujte Radne Tokove Bez Koda - Korak po Korak',
      date: '2026-01-18',
      excerpt: 'Naučite kako da kreirate moćne automatizacije sa n8n. Od instalacije do prvog produktivnog radnog toka - uključujući najbolje prakse.',
      category: 'Automatizacija',
      tags: ['n8n', 'Tutorial', 'Automatizacija', 'Workflow', 'No-Code', 'Self-Hosted'],
      coverImage: '/images/posts/n8n-automatisierung-tutorial/cover.jpg',
    },
    {
      slug: 'geo-generative-engine-optimization',
      title: 'GEO: Generative Engine Optimization - SEO za AI Eru',
      date: '2026-01-17',
      excerpt: 'Kako da optimizujete sadržaj za ChatGPT, Perplexity i druge AI pretraživače. Novi standard posle klasičnog SEO-a.',
      category: 'Marketing',
      tags: ['GEO', 'SEO', 'AI', 'ChatGPT', 'Perplexity', 'Content Marketing', 'AEO'],
      coverImage: '/images/posts/geo-generative-engine-optimization/cover.jpg',
    },
    {
      slug: 'gpt-api-integration-praxisguide',
      title: 'GPT API Integracija: Od API Ključa do Produkcione Aplikacije',
      date: '2026-01-16',
      excerpt: 'Praktični vodič za integraciju OpenAI GPT-4 u vaše aplikacije. Optimizacija tokena, rukovanje greškama i najbolje prakse.',
      category: 'AI Razvoj',
      tags: ['GPT-4', 'OpenAI', 'API', 'Integracija', 'Python', 'LLM', 'Prompt Engineering'],
      coverImage: '/images/posts/gpt-api-integration-praxisguide/cover.jpg',
    },
    {
      slug: 'ki-agenten-unternehmen-guide',
      title: 'AI Agenti za Preduzeća: Ultimativni Praktični Vodič 2026',
      date: '2026-01-15',
      excerpt: 'Kako kompanije mogu koristiti AI agente za automatizaciju procesa, smanjenje troškova i sticanje konkurentskih prednosti.',
      category: 'AI Razvoj',
      tags: ['AI Agenti', 'Automatizacija', 'GPT-4', 'Claude', 'LLM', 'Preduzeća'],
      coverImage: '/images/posts/ki-agenten-unternehmen-guide/cover.jpg',
    },
    {
      slug: 'n8n-make-zapier-vergleich',
      title: 'n8n vs Make vs Zapier: Koji Alat za Automatizaciju je Pravi za Vas?',
      date: '2026-01-10',
      excerpt: 'Detaljna uporedna analiza vodećih alata za automatizaciju radnih tokova sa prednostima i manama za različite slučajeve upotrebe.',
      category: 'Automatizacija',
      tags: ['n8n', 'Make', 'Zapier', 'Workflow', 'Automatizacija', 'No-Code'],
      coverImage: '/images/posts/n8n-make-zapier-vergleich/cover.jpg',
    },
    {
      slug: 'voice-ai-kundenservice-trends',
      title: 'Voice AI u Korisničkoj Službi: Trendovi i Najbolje Prakse 2026',
      date: '2026-01-05',
      excerpt: 'Kako Voice AI revolucioniše korisničku službu i koje tehnologije treba da evaluirate za vaš posao.',
      category: 'Voice AI',
      tags: ['Voice AI', 'Glasovni Asistent', 'Korisnička Služba', 'NLP', 'Chatbot', 'Vapi'],
      coverImage: '/images/posts/voice-ai-kundenservice-trends/cover.jpg',
    },
    {
      slug: 'saas-mvp-entwicklung-4-wochen',
      title: 'SaaS MVP za 4 Nedelje: Od Ideje do Lansiranja',
      date: '2025-12-20',
      excerpt: 'Korak-po-korak vodič za brz razvoj SaaS MVP-a sa Next.js, Prisma i modernim cloud servisima.',
      category: 'SaaS Razvoj',
      tags: ['SaaS', 'MVP', 'Next.js', 'Startup', 'Razvoj Proizvoda', 'React'],
      coverImage: '/images/posts/saas-mvp-entwicklung-4-wochen/cover.jpg',
    },
    {
      slug: 'erp-integration-breuninger',
      title: 'ApparelMagic i TradeByte: Analiza kompleksnih integracija',
      date: '2024-02-09',
      excerpt: 'Detaljna analiza e-commerce integracije izmedu Apparel Magic i Breuninger putem TradeByte',
      category: 'Sistemska Integracija',
      tags: ['ERP', 'Apparel Magic', 'TradeByte', 'API Integracija', 'Python', 'MariaDB'],
      coverImage: '/images/posts/erp-integration-breuninger/cover.jpg',
    },
  ],
};

const BASE_URL = process.env.NEXT_PUBLIC_SITE_URL || 'https://damjan-savic.com';

export async function generateMetadata({ params }: Props): Promise<Metadata> {
  const { locale } = await params;
  const t = await getTranslations({ locale, namespace: 'blog.meta' });

  const keywords: Record<string, string[]> = {
    de: [
      'KI Blog',
      'Automatisierung Blog',
      'Tech Blog',
      'KI-Agenten',
      'n8n Tutorials',
      'Voice AI',
      'SaaS Entwicklung',
      'Python Tutorials',
    ],
    en: [
      'AI Blog',
      'Automation Blog',
      'Tech Blog',
      'AI Agents Guide',
      'n8n Tutorials',
      'Voice AI Guide',
      'SaaS Development',
      'Python Tutorials',
      'GPT-4 Integration Guide',
      'AI Developer Blog',
      'Process Automation Tips',
    ],
    sr: [
      'AI Blog',
      'Automatizacija Blog',
      'Tech Blog',
      'AI Agenti',
      'n8n Tutoriali',
      'Voice AI',
      'SaaS Razvoj',
      'Python Tutoriali',
    ],
  };

  const localePath = locale === 'de' ? '/blog' : `/${locale}/blog`;

  return {
    title: t('title'),
    description: t('description'),
    keywords: keywords[locale] || keywords.de,
    alternates: {
      canonical: `${BASE_URL}${localePath}`,
      languages: {
        'x-default': `${BASE_URL}/blog`,
        de: `${BASE_URL}/blog`,
        en: `${BASE_URL}/en/blog`,
        sr: `${BASE_URL}/sr/blog`,
      },
    },
    openGraph: {
      title: t('title'),
      description: t('description'),
      url: `${BASE_URL}${localePath}`,
      type: 'website',
      locale: locale === 'de' ? 'de_DE' : locale === 'sr' ? 'sr_RS' : 'en_US',
      alternateLocale: ['de_DE', 'en_US', 'sr_RS'].filter(l => l !== (locale === 'de' ? 'de_DE' : locale === 'sr' ? 'sr_RS' : 'en_US')),
    },
  };
}


export default async function BlogPage({ params }: Props) {
  const { locale } = await params;
  setRequestLocale(locale);

  const t = await getTranslations('blog');

  // Get dynamic posts from markdown files
  const dynamicPosts = getAllBlogPosts();

  // Get legacy posts (with translations)
  const legacyPosts = legacyBlogPosts[locale] || legacyBlogPosts.de;

  // Merge: dynamic posts first, then legacy posts (avoiding duplicates)
  const legacySlugs = new Set(legacyPosts.map(p => p.slug));
  const allPosts = [
    ...dynamicPosts.filter(p => !legacySlugs.has(p.slug)),
    ...legacyPosts,
  ].sort((a, b) => new Date(b.date).getTime() - new Date(a.date).getTime());

  return (
    <main className="min-h-screen">
      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-16 sm:py-20 lg:py-24">
        {/* Header Section */}
        <div className="mb-12 sm:mb-16 lg:mb-20">
          <div className="flex items-center gap-4 mb-8">
            <ArrowRight className="h-5 w-5 text-zinc-500" />
            <h2 className="text-white text-sm tracking-wider">BLOG</h2>
          </div>
          <h1 className="text-3xl sm:text-4xl lg:text-5xl font-bold text-white mb-6">
            {t('meta.header.title')}
          </h1>
          <p className="text-lg sm:text-xl text-zinc-400 max-w-2xl">
            {t('meta.header.subtitle')}
          </p>
        </div>

        {/* Blog List with Search and Filters */}
        <BlogList
          posts={allPosts}
          locale={locale}
          translations={{
            searchPlaceholder: t('ui.search.placeholder'),
            showingText: (start: number, end: number, total: number) =>
              t('ui.pagination.showing', { start, end, total }),
            noPostsText: t('ui.errors.posts'),
            paginationPrevious: t('ui.pagination.previous'),
            paginationNext: t('ui.pagination.next'),
          }}
        />
      </div>
    </main>
  );
}
