/**
 * Datapoint Helpers — Validation Functions
 *
 * Document validation checks for DSGVO compliance.
 */

import {
  DataPoint,
  LocalizedText,
  SupportedLanguage,
} from '@/lib/sdk/einwilligungen/types'

import type { Language } from './datapoint-generators'

// =============================================================================
// TYPES
// =============================================================================

export interface ValidationWarning {
  type: 'error' | 'warning' | 'info'
  code: string
  message: string
  suggestion: string
  affectedDataPoints?: DataPoint[]
}

// =============================================================================
// VALIDATION FUNCTIONS
// =============================================================================

export function checkSpecialCategoriesWarning(
  dataPoints: DataPoint[],
  documentContent: string,
  lang: Language = 'de'
): ValidationWarning | null {
  const specialCategories = dataPoints.filter(dp => dp.isSpecialCategory)

  if (specialCategories.length === 0) return null

  const hasSection = lang === 'de'
    ? documentContent.includes('Art. 9') || documentContent.includes('Artikel 9') || documentContent.includes('besondere Kategorie')
    : documentContent.includes('Art. 9') || documentContent.includes('Article 9') || documentContent.includes('special categor')

  if (!hasSection) {
    return {
      type: 'error',
      code: 'MISSING_ART9_SECTION',
      message: lang === 'de'
        ? `${specialCategories.length} besondere Datenkategorien (Art. 9 DSGVO) ausgewaehlt, aber kein entsprechender Abschnitt im Dokument gefunden.`
        : `${specialCategories.length} special data categories (Art. 9 GDPR) selected, but no corresponding section found in document.`,
      suggestion: lang === 'de'
        ? 'Fuegen Sie einen Abschnitt zu besonderen Kategorien personenbezogener Daten hinzu oder verwenden Sie [BESONDERE_KATEGORIEN] als Platzhalter.'
        : 'Add a section about special categories of personal data or use [BESONDERE_KATEGORIEN] as placeholder.',
      affectedDataPoints: specialCategories
    }
  }

  return null
}

export function checkThirdCountryWarning(
  dataPoints: DataPoint[],
  documentContent: string,
  lang: Language = 'de'
): ValidationWarning | null {
  const thirdCountryIndicators = ['Google', 'AWS', 'Microsoft', 'Meta', 'Facebook', 'Cloudflare', 'USA', 'US']

  const thirdCountryPoints = dataPoints.filter(dp =>
    dp.thirdPartyRecipients?.some(r =>
      thirdCountryIndicators.some(i => r.toLowerCase().includes(i.toLowerCase()))
    )
  )

  if (thirdCountryPoints.length === 0) return null

  const hasSCCMention = lang === 'de'
    ? documentContent.includes('Standardvertragsklauseln') || documentContent.includes('SCC') || documentContent.includes('Art. 46')
    : documentContent.includes('Standard Contractual Clauses') || documentContent.includes('SCC') || documentContent.includes('Art. 46')

  if (!hasSCCMention) {
    return {
      type: 'warning',
      code: 'MISSING_SCC_SECTION',
      message: lang === 'de'
        ? `Drittland-Uebermittlung fuer ${thirdCountryPoints.length} Datenpunkte erkannt, aber keine Standardvertragsklauseln (SCC) erwaehnt.`
        : `Third country transfer detected for ${thirdCountryPoints.length} data points, but no Standard Contractual Clauses (SCC) mentioned.`,
      suggestion: lang === 'de'
        ? 'Erwaegen Sie die Aufnahme eines Abschnitts zu Drittland-Uebermittlungen und Standardvertragsklauseln oder verwenden Sie [DRITTLAND_TRANSFERS] als Platzhalter.'
        : 'Consider adding a section about third country transfers and Standard Contractual Clauses or use [DRITTLAND_TRANSFERS] as placeholder.',
      affectedDataPoints: thirdCountryPoints
    }
  }

  return null
}

export function checkExplicitConsentWarning(
  dataPoints: DataPoint[],
  documentContent: string,
  lang: Language = 'de'
): ValidationWarning | null {
  const explicitConsentPoints = dataPoints.filter(dp => dp.requiresExplicitConsent)

  if (explicitConsentPoints.length === 0) return null

  const hasConsentSection = lang === 'de'
    ? documentContent.includes('Einwilligung') || documentContent.includes('Widerruf') || documentContent.includes('Art. 7')
    : documentContent.includes('consent') || documentContent.includes('withdraw') || documentContent.includes('Art. 7')

  if (!hasConsentSection) {
    return {
      type: 'warning',
      code: 'MISSING_CONSENT_SECTION',
      message: lang === 'de'
        ? `${explicitConsentPoints.length} Datenpunkte erfordern ausdrueckliche Einwilligung, aber kein Abschnitt zu Einwilligung/Widerruf gefunden.`
        : `${explicitConsentPoints.length} data points require explicit consent, but no section about consent/withdrawal found.`,
      suggestion: lang === 'de'
        ? 'Fuegen Sie einen Abschnitt zum Widerrufsrecht hinzu.'
        : 'Add a section about the right to withdraw consent.',
      affectedDataPoints: explicitConsentPoints
    }
  }

  return null
}

export function validateDocument(
  dataPoints: DataPoint[],
  documentContent: string,
  lang: Language = 'de'
): ValidationWarning[] {
  const warnings: ValidationWarning[] = []

  const specialCatWarning = checkSpecialCategoriesWarning(dataPoints, documentContent, lang)
  if (specialCatWarning) warnings.push(specialCatWarning)

  const thirdCountryWarning = checkThirdCountryWarning(dataPoints, documentContent, lang)
  if (thirdCountryWarning) warnings.push(thirdCountryWarning)

  const consentWarning = checkExplicitConsentWarning(dataPoints, documentContent, lang)
  if (consentWarning) warnings.push(consentWarning)

  return warnings
}