import type { CollectionConfig } from 'payload'
import { authenticatedOnly, tenantScopedPublicRead } from '../lib/tenantAccess'

/**
 * Berechnet die geschätzte Lesezeit basierend auf Wortanzahl
 * Durchschnitt: ~200 Wörter pro Minute
 */
function calculateReadingTime(content: unknown): number {
  if (!content) return 1

  // RichText zu Plain Text konvertieren (vereinfacht)
  let text = ''
  const extractText = (node: unknown): void => {
    if (!node || typeof node !== 'object') return
    const n = node as Record<string, unknown>
    if (n.text && typeof n.text === 'string') {
      text += n.text + ' '
    }
    if (Array.isArray(n.children)) {
      n.children.forEach(extractText)
    }
    if (n.root && typeof n.root === 'object') {
      extractText(n.root)
    }
  }

  extractText(content)

  const words = text.trim().split(/\s+/).filter(Boolean).length
  const minutes = Math.ceil(words / 200)
  return Math.max(1, minutes)
}

export const Posts: CollectionConfig = {
  slug: 'posts',
  admin: {
    useAsTitle: 'title',
    group: 'Content',
    defaultColumns: ['title', 'type', 'isFeatured', 'status', 'publishedAt'],
  },
  access: {
    read: tenantScopedPublicRead,
    create: authenticatedOnly,
    update: authenticatedOnly,
    delete: authenticatedOnly,
  },
  fields: [
    {
      name: 'title',
      type: 'text',
      required: true,
      localized: true,
    },
    {
      name: 'slug',
      type: 'text',
      required: true,
      localized: true,
      unique: false, // Uniqueness per locale handled by index
      admin: {
        description: 'URL-Pfad (z.B. "mein-beitrag" / "my-post")',
      },
    },
    // === NEUE FELDER ===
    {
      name: 'type',
      type: 'select',
      required: true,
      defaultValue: 'blog',
      options: [
        { label: 'Blog-Artikel', value: 'blog' },
        { label: 'News/Aktuelles', value: 'news' },
        { label: 'Pressemitteilung', value: 'press' },
        { label: 'Ankündigung', value: 'announcement' },
      ],
      admin: {
        position: 'sidebar',
        description: 'Art des Beitrags',
      },
    },
    {
      name: 'isFeatured',
      type: 'checkbox',
      defaultValue: false,
      label: 'Hervorgehoben',
      admin: {
        position: 'sidebar',
        description: 'Auf Startseite/oben anzeigen',
      },
    },
    {
      name: 'excerpt',
      type: 'textarea',
      label: 'Kurzfassung',
      maxLength: 300,
      localized: true,
      admin: {
        description: 'Für Übersichten und SEO (max. 300 Zeichen). Wird automatisch aus Content generiert, falls leer.',
      },
    },
    // === ENDE NEUE FELDER ===
    {
      name: 'featuredImage',
      type: 'upload',
      relationTo: 'media',
      label: 'Beitragsbild',
    },
    {
      name: 'content',
      type: 'richText',
      required: true,
      localized: true,
    },
    {
      name: 'categories',
      type: 'relationship',
      relationTo: 'categories',
      hasMany: true,
      label: 'Kategorien',
    },
    {
      name: 'tags',
      type: 'relationship',
      relationTo: 'tags',
      hasMany: true,
      label: 'Tags',
      admin: {
        description: 'Schlagwörter für bessere Auffindbarkeit',
      },
    },
    {
      name: 'author',
      type: 'relationship',
      relationTo: 'authors',
      label: 'Autor',
      admin: {
        description: 'Hauptautor des Beitrags',
      },
    },
    {
      name: 'coAuthors',
      type: 'relationship',
      relationTo: 'authors',
      hasMany: true,
      label: 'Co-Autoren',
      admin: {
        description: 'Weitere beteiligte Autoren',
      },
    },
    {
      name: 'authorLegacy',
      type: 'text',
      label: 'Autor (Legacy)',
      admin: {
        description: 'Freitext-Autor für ältere Beiträge ohne Autoren-Eintrag',
        condition: (_, siblingData) => !siblingData?.author,
      },
    },
    {
      name: 'readingTime',
      type: 'number',
      label: 'Lesezeit (Minuten)',
      admin: {
        position: 'sidebar',
        description: 'Wird automatisch berechnet',
        readOnly: true,
      },
    },
    {
      name: 'status',
      type: 'select',
      defaultValue: 'draft',
      options: [
        { label: 'Entwurf', value: 'draft' },
        { label: 'Veröffentlicht', value: 'published' },
        { label: 'Archiviert', value: 'archived' },
      ],
      admin: {
        position: 'sidebar',
      },
    },
    {
      name: 'publishedAt',
      type: 'date',
      label: 'Veröffentlichungsdatum',
      admin: {
        position: 'sidebar',
        date: {
          pickerAppearance: 'dayAndTime',
        },
      },
    },
    {
      name: 'seo',
      type: 'group',
      label: 'SEO',
      fields: [
        {
          name: 'metaTitle',
          type: 'text',
          label: 'Meta-Titel',
          localized: true,
        },
        {
          name: 'metaDescription',
          type: 'textarea',
          label: 'Meta-Beschreibung',
          maxLength: 160,
          localized: true,
        },
        {
          name: 'ogImage',
          type: 'upload',
          relationTo: 'media',
          label: 'Social Media Bild',
        },
      ],
    },
  ],
  hooks: {
    beforeChange: [
      ({ data }) => {
        // Automatische Lesezeit-Berechnung
        if (data?.content) {
          data.readingTime = calculateReadingTime(data.content)
        }
        return data
      },
    ],
  },
}