/**
 * Directus API Client (REST-based, no SDK dependencies)
 */

const DIRECTUS_URL = process.env.DIRECTUS_URL || 'https://cms.dk0.dev';
const DIRECTUS_TOKEN = process.env.DIRECTUS_STATIC_TOKEN || '';

// Debug: Log if token is set
if (process.env.NODE_ENV === 'development' && typeof process !== 'undefined' && process.env.DIRECTUS_STATIC_TOKEN) {
  console.log('✓ Directus token loaded:', DIRECTUS_TOKEN.substring(0, 5) + '...');
} else if (process.env.NODE_ENV === 'development') {
  console.log('⚠ Directus token NOT loaded from .env');
}

// Mapping: next-intl locale → Directus language code
const localeToDirectus: Record<string, string> = {
  en: 'en-US',
  de: 'de-DE',
};

function toDirectusLocale(locale: string): string {
  return localeToDirectus[locale] || locale;
}

interface FetchOptions {
  method?: 'GET' | 'POST' | 'PATCH' | 'DELETE';
  body?: {
    query?: string;
    variables?: Record<string, unknown>;
    [key: string]: unknown;
  };
}

async function directusRequest<T>(
  endpoint: string,
  options: FetchOptions = {}
): Promise<T | null> {
  // Wenn kein Token gesetzt, skip Directus (nutze JSON fallback)
  if (!DIRECTUS_TOKEN || DIRECTUS_TOKEN === '') {
    return null;
  }

  const url = `${DIRECTUS_URL}/graphql`;

  try {
    const response = await fetch(url, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        Authorization: `Bearer ${DIRECTUS_TOKEN}`,
      },
      body: JSON.stringify(options.body || {}),
      // Timeout nach 2 Sekunden
      signal: AbortSignal.timeout(2000),
    });

    if (!response.ok) {
      // Collection noch nicht erstellt? Stille fallback zu JSON
      const text = await response.text();
      if (process.env.NODE_ENV === 'development') {
        console.error(`Directus error: ${response.status}`, text.substring(0, 200));
      }
      if (text.includes('GRAPHQL_VALIDATION') || text.includes('Cannot query field')) {
        // Stille: Collection existiert noch nicht
        return null;
      }
      return null;
    }

    const data = await response.json();
    
    // Prüfe auf GraphQL errors
    if (data?.errors) {
      if (process.env.NODE_ENV === 'development') {
        console.error('Directus GraphQL errors:', JSON.stringify(data.errors).substring(0, 200));
      }
      // Stille: Collection noch nicht ready
      return null;
    }
    
    return data?.data || null;
  } catch (error: unknown) {
    // Timeout oder Network Error - stille fallback
    if (error && typeof error === 'object' && 'name' in error && (error.name === 'TimeoutError' || error.name === 'AbortError')) {
      if (process.env.NODE_ENV === 'development') {
        console.error('Directus timeout');
      }
      return null;
    }
    // Andere Errors nur in dev loggen
    if (process.env.NODE_ENV === 'development') {
      const message = error && typeof error === 'object' && 'message' in error ? String(error.message) : 'Unknown error';
      console.error('Directus request failed:', message);
    }
    return null;
  }
}

export async function getMessages(locale: string): Promise<Record<string, string>> {
  const directusLocale = toDirectusLocale(locale);
  const query = `
    query {
      messages {
        key
        translations {
          value
          languages_code { code }
        }
      }
    }
  `;

  try {
    const result = await directusRequest('', { body: { query } });
    interface MessageData {
      messages: Array<{
        key: string;
        translations?: Array<{
          languages_code?: { code: string };
          value?: string;
        }>;
      }>;
    }
    const messages = (result as MessageData | null)?.messages || [];
    const dictionary: Record<string, string> = {};

    messages.forEach((m) => {
      const trans = m.translations?.find((t) => t.languages_code?.code === directusLocale);
      if (trans?.value) dictionary[m.key] = trans.value;
    });

    return dictionary;
  } catch (error) {
    return {};
  }
}

/**
 * Get a single message by key from Directus
 */
export async function getMessage(key: string, locale: string): Promise<string | null> {
  const directusLocale = toDirectusLocale(locale);
  const query = `
    query {
      messages(filter: {key: {_eq: "${key}"}}, limit: 1) {
        key
        translations {
          value
          languages_code { code }
        }
      }
    }
  `;

  try {
    const result = await directusRequest('', { body: { query } });
    interface SingleMessageData {
      messages: Array<{
        translations?: Array<{
          languages_code?: { code: string };
          value?: string;
        }>;
      }>;
    }
    const messages = (result as SingleMessageData | null)?.messages;
    if (!messages || messages.length === 0) return null;
    
    const translations = messages[0]?.translations || [];
    const translation = translations.find((t) => t.languages_code?.code === directusLocale);
    return translation?.value || null;
  } catch (error) {
    return null;
  }
}

export interface ContentPage {
  slug: string;
  content?: string;
  [key: string]: unknown;
}

export async function getContentPage(
  slug: string,
  locale: string
): Promise<ContentPage | null> {
  const directusLocale = toDirectusLocale(locale);
  const query = `
    query {
      content_pages(
        filter: { 
          _and: [
            { slug: { _eq: "${slug}" } },
            { locale: { _eq: "${directusLocale}" } }
          ]
        }
        limit: 1
      ) {
        slug
        locale
        title
        content
        status
      }
    }
  `;

  try {
    const result = await directusRequest(
      '',
      { body: { query } }
    );

    interface ContentPagesResult {
      content_pages: ContentPage[];
    }
    const pages = (result as ContentPagesResult | null)?.content_pages || [];
    if (pages.length === 0) {
      // Try without locale filter
      const fallbackQuery = `
        query {
          content_pages(
            filter: { slug: { _eq: "${slug}" } }
            limit: 1
          ) {
            slug
            locale
            title
            content
            status
          }
        }
      `;
      const fallbackResult = await directusRequest('', { body: { query: fallbackQuery } });
      const fallbackPages = (fallbackResult as ContentPagesResult | null)?.content_pages || [];
      return fallbackPages[0] || null;
    }

    return pages[0];
  } catch (error) {
    console.error(`Failed to fetch content page ${slug} (${locale}):`, error);
    return null;
  }
}

// Tech Stack Types
export interface TechStackItem {
  id: string;
  name: string;
  url?: string;
  icon_url?: string;
  sort: number;
}

export interface TechStackCategory {
  id: string;
  key: string;
  icon: string;
  sort: number;
  name: string; // Translated name
  items: TechStackItem[];
}

/**
 * Get Tech Stack from Directus with translations
 */
// Fallback tech stack data (used when Directus items aren't available)
const fallbackTechStackData: Record<string, Array<{ key: string; items: string[] }>> = {
  'en-US': [
    { key: 'frontend', items: ['Next.js', 'Tailwind CSS', 'Flutter'] },
    { key: 'backend', items: ['Docker Swarm', 'Traefik', 'Nginx Proxy Manager', 'Redis'] },
    { key: 'tools', items: ['Git', 'CI/CD', 'n8n', 'Self-hosted Services'] },
    { key: 'security', items: ['CrowdSec', 'Suricata', 'Mailcow'] }
  ],
  'de-DE': [
    { key: 'frontend', items: ['Next.js', 'Tailwind CSS', 'Flutter'] },
    { key: 'backend', items: ['Docker Swarm', 'Traefik', 'Nginx Proxy Manager', 'Redis'] },
    { key: 'tools', items: ['Git', 'CI/CD', 'n8n', 'Self-Hosted-Services'] },
    { key: 'security', items: ['CrowdSec', 'Suricata', 'Mailcow'] }
  ]
};

const categoryIconMap: Record<string, string> = {
  frontend: 'Globe',
  backend: 'Server',
  tools: 'Wrench',
  security: 'Shield'
};

const categoryNames: Record<string, Record<string, string>> = {
  'en-US': {
    frontend: 'Frontend & Mobile',
    backend: 'Backend & DevOps',
    tools: 'Tools & Automation',
    security: 'Security & Admin'
  },
  'de-DE': {
    frontend: 'Frontend & Mobile',
    backend: 'Backend & DevOps',
    tools: 'Tools & Automation',
    security: 'Security & Admin'
  }
};

export async function getTechStack(locale: string): Promise<TechStackCategory[] | null> {
  const directusLocale = toDirectusLocale(locale);
  
  try {
    if (process.env.NODE_ENV === 'development') {
      console.log('[getTechStack] Fetching with locale:', directusLocale);
    }

    // Fetch categories via GraphQL with translations
    const categoriesQuery = `
      query {
        tech_stack_categories(
          filter: { status: { _eq: "published" } }
          sort: "sort"
        ) {
          id
          key
          icon
          sort
          translations(filter: { languages_code: { code: { _eq: "${directusLocale}" } } }) {
            name
          }
        }
      }
    `;

    const categoriesResult = await directusRequest(
      '',
      { body: { query: categoriesQuery } }
    );

    interface TechStackCategoriesResult {
      tech_stack_categories: Array<{
        id: string;
        key: string;
        icon: string;
        sort: number;
        translations?: Array<{
          languages_code?: { code: string };
          name?: string;
        }>;
      }>;
    }
    const categories = (categoriesResult as TechStackCategoriesResult | null)?.tech_stack_categories;

    if (!categories || categories.length === 0) {
      if (process.env.NODE_ENV === 'development') {
        console.log('[getTechStack] No categories found, using fallback');
      }
      return null;
    }

    if (process.env.NODE_ENV === 'development') {
      console.log('[getTechStack] Found categories:', categories.length);
    }

    // Fetch items via REST API (since GraphQL category relationship returns null)
    const itemsResponse = await fetch(
      `${DIRECTUS_URL}/items/tech_stack_items?fields=id,name,category,url,icon_url,sort&sort=sort&limit=100`,
      {
        headers: {
          Authorization: `Bearer ${DIRECTUS_TOKEN}`,
        },
      }
    );

    const itemsData = await itemsResponse.json();
    interface ItemsResponseData {
      data: Array<{
        id: string;
        name: string;
        category: string | number;
        url?: string;
        icon_url?: string;
        sort: number;
      }>;
    }
    const allItems = (itemsData as ItemsResponseData | null)?.data || [];

    if (process.env.NODE_ENV === 'development') {
      console.log('[getTechStack] Fetched items:', allItems.length);
    }

    // Group items by category
    const categoriesWithItems = categories.map((cat) => {
      const categoryItems = allItems.filter((item) => 
        item.category === cat.id || item.category === parseInt(cat.id)
      );
      
      // Fallback: if no items linked by category, use fallback data
      let itemsToUse = categoryItems;
      if (itemsToUse.length === 0) {
        const fallbackData = fallbackTechStackData[directusLocale];
        const categoryFallback = fallbackData?.find(f => f.key === cat.key);
        if (categoryFallback) {
          itemsToUse = categoryFallback.items.map((name, idx) => ({
            id: `fallback-${cat.key}-${idx}`,
            name: name,
            category: cat.id,
            url: undefined,
            icon_url: undefined,
            sort: idx + 1
          }));
        }
      }

      return {
        id: cat.id,
        key: cat.key,
        icon: cat.icon,
        sort: cat.sort,
        name: cat.translations?.[0]?.name || categoryNames[directusLocale]?.[cat.key] || cat.key,
        items: itemsToUse.map((item: any) => ({
          id: item.id,
          name: item.name,
          url: item.url,
          icon_url: item.icon_url,
          sort: item.sort
        }))
      };
    });

    return categoriesWithItems;
  } catch (error) {
    console.error(`Failed to fetch tech stack (${locale}):`, error);
    return null;
  }
}

// Hobbies Types
export interface Hobby {
  id: string;
  key: string;
  icon: string;
  title: string; // Translated title
  description?: string; // Translated description
}

/**
 * Get Hobbies from Directus with translations
 */
export async function getHobbies(locale: string): Promise<Hobby[] | null> {
  const directusLocale = toDirectusLocale(locale);
  
  const query = `
    query {
      hobbies(
        filter: { status: { _eq: "published" } }
        sort: "sort"
      ) {
        id
        key
        icon
        translations(filter: { languages_code: { code: { _eq: "${directusLocale}" } } }) {
          title
          description
        }
      }
    }
  `;

  try {
    const result = await directusRequest(
      '',
      { body: { query } }
    );

    const hobbies = (result as any)?.hobbies;
    if (!hobbies || hobbies.length === 0) {
      return null;
    }

    return hobbies.map((hobby: any) => ({
      id: hobby.id,
      key: hobby.key,
      icon: hobby.icon,
      title: hobby.translations?.[0]?.title || hobby.key,
      description: hobby.translations?.[0]?.description
    }));
  } catch (error) {
    console.error(`Failed to fetch hobbies (${locale}):`, error);
    return null;
  }
}

// Book Review Types
export interface BookReview {
  id: string;
  hardcover_id?: string;
  book_title: string;
  book_author: string;
  book_image?: string;
  rating: number; // 1-5
  review?: string; // Translated review text
  finished_at?: string;
}

/**
 * Get Book Reviews from Directus with translations
 */
export async function getBookReviews(locale: string): Promise<BookReview[] | null> {
  const directusLocale = toDirectusLocale(locale);

  const query = `
    query {
      book_reviews(
        filter: { status: { _eq: "published" } }
        sort: ["-finished_at"]
      ) {
        id
        hardcover_id
        book_title
        book_author
        book_image
        rating
        finished_at
        translations {
          review
          languages_code {
            code
          }
        }
      }
    }
  `;

  try {
    const result = await directusRequest(
      '',
      { body: { query } }
    );

    const reviews = (result as any)?.book_reviews;
    if (!reviews || reviews.length === 0) {
      return null;
    }

    return reviews.map((item: any) => {
      // Filter die passende Übersetzung im Code
      const translation = item.translations?.find(
        (t: any) => t.languages_code?.code === directusLocale
      ) || item.translations?.[0]; // Fallback auf die erste Übersetzung falls locale nicht passt

      return {
        id: item.id,
        hardcover_id: item.hardcover_id || undefined,
        book_title: item.book_title,
        book_author: item.book_author,
        book_image: item.book_image || undefined,
        rating: typeof item.rating === 'number' ? item.rating : parseInt(item.rating) || 0,
        review: translation?.review || undefined,
        finished_at: item.finished_at || undefined,
      };
    });
  } catch (error) {
    console.error(`Failed to fetch book reviews (${locale}):`, error);
    return null;
  }
}

// Projects Types
export interface Project {
  id: string | number; // Allow both string (from Directus) and number (from Prisma)
  slug: string;
  title: string;
  description: string;
  content?: string;
  category?: string;
  difficulty?: string;
  tags: string[];
  technologies: string[];
  challenges?: string;
  lessons_learned?: string;
  future_improvements?: string;
  github_url?: string;
  live_url?: string;
  button_live_label?: string;
  button_github_label?: string;
  image_url?: string;
  demo_video_url?: string;
  performance_metrics?: string;
  screenshots?: string[];
  featured: boolean;
  published: boolean;
  created_at?: string;
  updated_at?: string;
}

/**
 * Get Projects from Directus with translations
 * 
 * @param locale - Language code (en or de)
 * @param options - Filter options
 * @returns Array of projects or null
 */
export async function getProjects(
  locale: string,
  options?: {
    featured?: boolean;
    published?: boolean;
    category?: string;
    difficulty?: string;
    search?: string;
    limit?: number;
  }
): Promise<Project[] | null> {
  const directusLocale = toDirectusLocale(locale);
  
  // Build filters
  const filters = ['status: { _eq: "published" }'];
  
  if (options?.featured !== undefined) {
    filters.push(`featured: { _eq: ${options.featured ? 'true' : 'false'} }`);
  }
  
  // Remove published filter since it doesn't exist in Directus schema
  // The status field already handles published/draft state
  
  if (options?.category) {
    filters.push(`category: { _eq: "${options.category}" }`);
  }
  
  if (options?.difficulty) {
    filters.push(`difficulty: { _eq: "${options.difficulty}" }`);
  }
  
  if (options?.search) {
    // Search in translations title and description
    filters.push(`_or: [
      { translations: { title: { _icontains: "${options.search}" } } },
      { translations: { description: { _icontains: "${options.search}" } } }
    ]`);
  }

  const filterString = filters.length > 0 ? `filter: { _and: [{ ${filters.join(' }, { ')} }] }` : '';
  const limitString = options?.limit ? `limit: ${options.limit}` : '';

  const query = `
    query {
      projects(
        ${filterString}
        ${limitString}
        sort: ["-featured", "-date_created"]
      ) {
        id
        slug
        category
        difficulty
        tags
        technologies
        challenges
        lessons_learned
        future_improvements
        github
        live
        image_url
        demo_video
        date_created
        date_updated
        featured
        status
        translations {
          title
          description
          content
          meta_description
          keywords
          button_live_label
          button_github_label
          languages_code { code }
        }
      }
    }
  `;

  try {
    const result = await directusRequest(
      '',
      { body: { query } }
    );

    const projects = (result as any)?.projects;
    if (!projects || projects.length === 0) {
      return null;
    }

    return projects.map((proj: any) => {
      const trans =
        proj.translations?.find((t: any) => t.languages_code?.code === directusLocale) ||
        proj.translations?.[0] ||
        {};
      
      // Parse JSON string fields if needed
      const parseTags = (tags: any) => {
        if (!tags) return [];
        if (Array.isArray(tags)) return tags;
        if (typeof tags === 'string') {
          try {
            return JSON.parse(tags);
          } catch {
            return [];
          }
        }
        return [];
      };
      
      return {
        id: proj.id,
        slug: proj.slug,
        title: trans.title || proj.slug,
        description: trans.description || '',
        content: trans.content,
        category: proj.category,
        difficulty: proj.difficulty,
        tags: parseTags(proj.tags),
        technologies: parseTags(proj.technologies),
        challenges: proj.challenges,
        lessons_learned: proj.lessons_learned,
        future_improvements: proj.future_improvements,
        github_url: proj.github,
        live_url: proj.live,
        button_live_label: trans.button_live_label,
        button_github_label: trans.button_github_label,
        image_url: proj.image_url,
        demo_video_url: proj.demo_video,
        performance_metrics: proj.performance_metrics,
        screenshots: parseTags(proj.screenshots),
        featured: proj.featured === 1 || proj.featured === true,
        published: proj.status === 'published',
        created_at: proj.date_created,
        updated_at: proj.date_updated
      };
    });
  } catch (error) {
    console.error(`Failed to fetch projects (${locale}):`, error);
    return null;
  }
}

/**
 * Get a single project by slug from Directus
 */
export async function getProjectBySlug(
  slug: string,
  locale: string
): Promise<Project | null> {
  const directusLocale = toDirectusLocale(locale);

  const query = `
    query {
      projects(
        filter: { 
          _and: [
            { slug: { _eq: "${slug}" } },
            { status: { _eq: "published" } }
          ]
        }
        limit: 1
      ) {
        id
        slug
        category
        difficulty
        tags
        technologies
        challenges
        lessons_learned
        future_improvements
        github
        live
        image_url
        demo_video
        date_created
        date_updated
        featured
        status
        translations {
          title
          description
          content
          meta_description
          keywords
          button_live_label
          button_github_label
          languages_code { code }
        }
      }
    }
  `;

  try {
    const result = await directusRequest(
      '',
      { body: { query } }
    );

    const projects = (result as any)?.projects;
    if (!projects || projects.length === 0) {
      return null;
    }

    const proj = projects[0];
    const trans =
      proj.translations?.find((t: any) => t.languages_code?.code === directusLocale) ||
      proj.translations?.[0] ||
      {};
    
    // Parse JSON string fields if needed
    const parseTags = (tags: any) => {
      if (!tags) return [];
      if (Array.isArray(tags)) return tags;
      if (typeof tags === 'string') {
        try {
          return JSON.parse(tags);
        } catch {
          return [];
        }
      }
      return [];
    };
    
    return {
      id: proj.id,
      slug: proj.slug,
      title: trans.title || proj.slug,
      description: trans.description || '',
      content: trans.content,
      category: proj.category,
      difficulty: proj.difficulty,
      tags: parseTags(proj.tags),
      technologies: parseTags(proj.technologies),
      challenges: proj.challenges,
      lessons_learned: proj.lessons_learned,
      future_improvements: proj.future_improvements,
      github_url: proj.github,
      live_url: proj.live,
      button_live_label: trans.button_live_label,
      button_github_label: trans.button_github_label,
      image_url: proj.image_url,
      demo_video_url: proj.demo_video,
      screenshots: parseTags(proj.screenshots),
      featured: proj.featured === 1 || proj.featured === true,
      published: proj.status === 'published',
      created_at: proj.date_created,
      updated_at: proj.date_updated
    };
  } catch (error) {
    console.error(`Failed to fetch project by slug ${slug} (${locale}):`, error);
    return null;
  }
}

// Snippets Types
export interface Snippet {
  id: string;
  title: string;
  category: string;
  code: string;
  description: string;
  language: string;
}

/**
 * Get Snippets from Directus
 */
export async function getSnippets(limit = 10, featured?: boolean): Promise<Snippet[] | null> {
  const filters = ['status: { _eq: "published" }'];
  if (featured !== undefined) {
    filters.push(`featured: { _eq: ${featured} }`);
  }
  const filterString = `filter: { _and: [{ ${filters.join(' }, { ')} }] }`;

  const query = `
    query {
      snippets(
        ${filterString}
        limit: ${limit}
      ) {
        id
        title
        category
        code
        description
        language
      }
    }
  `;

  try {
    const result = await directusRequest(
      '',
      { body: { query } }
    );

    const snippets = (result as any)?.snippets;
    if (!snippets || snippets.length === 0) {
      return null;
    }

    return snippets;
  } catch (error) {
    console.error('Failed to fetch snippets:', error);
    return null;
  }
}