import type { CollectionConfig, FieldHook } from 'payload'
import { invalidateEmailCacheHook } from '../hooks/invalidateEmailCache'
import { auditTenantAfterChange, auditTenantAfterDelete } from '../hooks/auditTenantChanges'
import { neverReadable } from '../lib/access'

/**
 * Validiert SMTP Host Format
 */
const validateSmtpHost: FieldHook = ({ value, siblingData }) => {
  // Nur validieren wenn useCustomSmtp aktiv ist und ein Wert vorhanden
  const emailData = siblingData as { useCustomSmtp?: boolean }
  if (!emailData?.useCustomSmtp) return value
  if (!value) return value

  // Basis-Validierung: Keine Protokoll-Präfixe erlaubt
  if (value.includes('://')) {
    throw new Error('SMTP Host ohne Protokoll angeben (z.B. smtp.example.com)')
  }

  return value
}

/**
 * Validiert SMTP Port
 */
const validateSmtpPort: FieldHook = ({ value, siblingData }) => {
  const emailData = siblingData as { useCustomSmtp?: boolean }
  if (!emailData?.useCustomSmtp) return value

  const port = Number(value)
  if (port && (port < 1 || port > 65535)) {
    throw new Error('Port muss zwischen 1 und 65535 liegen')
  }

  return value
}

export const Tenants: CollectionConfig = {
  slug: 'tenants',
  admin: {
    useAsTitle: 'name',
  },
  hooks: {
    afterChange: [invalidateEmailCacheHook, auditTenantAfterChange],
    afterDelete: [auditTenantAfterDelete],
  },
  fields: [
    {
      name: 'name',
      type: 'text',
      required: true,
    },
    {
      name: 'slug',
      type: 'text',
      required: true,
      unique: true,
    },
    {
      name: 'domains',
      type: 'array',
      fields: [
        {
          name: 'domain',
          type: 'text',
          required: true,
        },
      ],
    },
    // E-Mail Konfiguration
    {
      name: 'email',
      type: 'group',
      label: 'E-Mail Konfiguration',
      admin: {
        description: 'SMTP-Einstellungen für diesen Tenant. Leer = globale Einstellungen.',
      },
      fields: [
        {
          type: 'row',
          fields: [
            {
              name: 'fromAddress',
              type: 'email',
              label: 'Absender E-Mail',
              admin: {
                placeholder: 'info@domain.de',
                width: '50%',
                description:
                  'Tipp: Verwenden Sie eine E-Mail-Adresse der Domain, für die SPF/DKIM konfiguriert ist.',
              },
            },
            {
              name: 'fromName',
              type: 'text',
              label: 'Absender Name',
              admin: {
                placeholder: 'Firmenname',
                width: '50%',
              },
            },
          ],
        },
        {
          name: 'replyTo',
          type: 'email',
          label: 'Antwort-Adresse (Reply-To)',
          admin: {
            placeholder: 'kontakt@domain.de (optional)',
          },
        },
        // SPF/DKIM Info-Block
        {
          name: 'emailDeliverabilityInfo',
          type: 'ui',
          admin: {
            components: {
              Field: '@/components/admin/EmailDeliverabilityInfo#EmailDeliverabilityInfo',
            },
          },
        },
        {
          name: 'useCustomSmtp',
          type: 'checkbox',
          label: 'Eigenen SMTP-Server verwenden',
          defaultValue: false,
          admin: {
            description:
              'Aktivieren Sie diese Option, um einen eigenen SMTP-Server statt der globalen Einstellungen zu verwenden.',
          },
        },
        {
          name: 'smtp',
          type: 'group',
          label: 'SMTP Einstellungen',
          admin: {
            condition: (_, siblingData) => siblingData?.useCustomSmtp,
            description:
              'Hinweis: Stellen Sie sicher, dass SPF- und DKIM-Einträge für Ihre Domain konfiguriert sind, um eine optimale E-Mail-Zustellung zu gewährleisten.',
          },
          fields: [
            {
              type: 'row',
              fields: [
                {
                  name: 'host',
                  type: 'text',
                  label: 'SMTP Host',
                  required: true,
                  admin: {
                    placeholder: 'smtp.example.com',
                    width: '50%',
                    description: 'Hostname ohne Protokoll (z.B. smtp.gmail.com)',
                  },
                  hooks: {
                    beforeValidate: [validateSmtpHost],
                  },
                  validate: (value: string | undefined | null, { siblingData }: { siblingData: Record<string, unknown> }) => {
                    const emailData = siblingData as { useCustomSmtp?: boolean }
                    if (emailData?.useCustomSmtp && !value) {
                      return 'SMTP Host ist erforderlich'
                    }
                    return true
                  },
                },
                {
                  name: 'port',
                  type: 'number',
                  label: 'Port',
                  defaultValue: 587,
                  admin: {
                    width: '25%',
                    description: '587 (STARTTLS) oder 465 (SSL)',
                  },
                  hooks: {
                    beforeValidate: [validateSmtpPort],
                  },
                  min: 1,
                  max: 65535,
                },
                {
                  name: 'secure',
                  type: 'checkbox',
                  label: 'SSL/TLS (Port 465)',
                  defaultValue: false,
                  admin: {
                    width: '25%',
                    description: 'Für Port 465 aktivieren',
                  },
                },
              ],
            },
            {
              type: 'row',
              fields: [
                {
                  name: 'user',
                  type: 'text',
                  label: 'SMTP Benutzername',
                  required: true,
                  admin: {
                    width: '50%',
                    description: 'Meist die E-Mail-Adresse',
                  },
                  validate: (value: string | undefined | null, { siblingData }: { siblingData: Record<string, unknown> }) => {
                    const smtpData = siblingData as { host?: string }
                    // Nur validieren wenn host gesetzt ist (d.h. SMTP aktiv)
                    if (smtpData?.host && !value) {
                      return 'SMTP Benutzername ist erforderlich'
                    }
                    return true
                  },
                },
                {
                  name: 'pass',
                  type: 'text',
                  label: 'SMTP Passwort',
                  admin: {
                    width: '50%',
                    description: 'Leer lassen um bestehendes Passwort zu behalten',
                  },
                  access: {
                    read: neverReadable, // Passwort nie in API-Response
                  },
                  hooks: {
                    beforeChange: [
                      ({ value, originalDoc }) => {
                        // Behalte altes Passwort wenn Feld leer
                        if (!value && originalDoc?.email?.smtp?.pass) {
                          return originalDoc.email.smtp.pass
                        }
                        return value
                      },
                    ],
                  },
                },
              ],
            },
            // Test-Email Button
            {
              name: 'testEmailButton',
              type: 'ui',
              admin: {
                components: {
                  Field: '@/components/admin/TestEmailButton#TestEmailButton',
                },
              },
            },
          ],
        },
      ],
    },
  ],
}