/**
 * DSFA Pre-Fill — derives initial DSFA data from Company Profile + Scope answers.
 *
 * Maps: Firmensitz → Bundesland, Scope-Antworten → Datenkategorien/Risiken,
 * Use Cases → Verarbeitungstaetigkeiten, DPO → Beratungsinformationen.
 */

import type { ScopeProfilingAnswer } from '@/lib/sdk/compliance-scope-types'

interface CompanyProfileMinimal {
  headquartersState?: string
  industry?: string[]
  businessModel?: string
  dpoName?: string | null
  dpoEmail?: string | null
  companyName?: string
}

export interface DSFAPrefillResult {
  title: string
  description: string
  processingActivity: string
  dataCategories: string[]
  dataSubjects: string[]
  riskLevel: string
  measures: string[]
  federalState: string
  involvesAi: boolean
  legalBasis: string
  processingPurpose: string
  affectedRights: string[]
}

const ART9_CATEGORY_MAP: Record<string, string> = {
  health: 'Gesundheitsdaten',
  biometric: 'Biometrische Daten',
  genetic: 'Genetische Daten',
  ethnic: 'Ethnische Herkunft',
  political: 'Politische Meinungen',
  religious: 'Religioese Ueberzeugungen',
  union: 'Gewerkschaftszugehoerigkeit',
  sexual: 'Sexualleben/Orientierung',
}

const BUNDESLAND_LABELS: Record<string, string> = {
  BW: 'Baden-Wuerttemberg', BY: 'Bayern', BE: 'Berlin', BB: 'Brandenburg',
  HB: 'Bremen', HH: 'Hamburg', HE: 'Hessen', MV: 'Mecklenburg-Vorpommern',
  NI: 'Niedersachsen', NW: 'Nordrhein-Westfalen', RP: 'Rheinland-Pfalz',
  SL: 'Saarland', SN: 'Sachsen', ST: 'Sachsen-Anhalt',
  SH: 'Schleswig-Holstein', TH: 'Thueringen',
}

function getAnswer(answers: ScopeProfilingAnswer[], questionId: string): string | string[] | boolean | undefined {
  const a = answers.find(a => a.questionId === questionId)
  return a?.value as string | string[] | boolean | undefined
}

export function prefillDSFAFromScope(
  profile: CompanyProfileMinimal | null,
  scopeAnswers: ScopeProfilingAnswer[],
): DSFAPrefillResult {
  const result: DSFAPrefillResult = {
    title: '',
    description: '',
    processingActivity: '',
    dataCategories: [],
    dataSubjects: [],
    riskLevel: 'mittel',
    measures: ['Zugriffskontrolle', 'Verschluesselung'],
    federalState: '',
    involvesAi: false,
    legalBasis: '',
    processingPurpose: '',
    affectedRights: [],
  }

  // 1. Firmensitz → Bundesland
  if (profile?.headquartersState) {
    result.federalState = profile.headquartersState
  }

  // 2. Art. 9 Daten → Datenkategorien + Risikostufe
  const art9 = getAnswer(scopeAnswers, 'data_art9')
  if (art9 === true || art9 === 'yes') {
    result.dataCategories.push('Besondere Kategorien (Art. 9)')
    result.riskLevel = 'hoch'
    result.title = 'DSFA — Verarbeitung besonderer Datenkategorien'
  }
  if (Array.isArray(art9)) {
    for (const cat of art9) {
      const label = ART9_CATEGORY_MAP[cat]
      if (label) result.dataCategories.push(label)
    }
    if (art9.length > 0) result.riskLevel = 'hoch'
  }

  // 3. Minderjährige → Betroffene + Risiko
  const minors = getAnswer(scopeAnswers, 'data_minors')
  if (minors === true || minors === 'yes') {
    result.dataSubjects.push('Minderjaehrige (unter 16 Jahre)')
    result.riskLevel = 'hoch'
    result.affectedRights.push('Besonderer Schutz Minderjaehriger (Art. 8 DSGVO)')
    if (!result.title) result.title = 'DSFA — Verarbeitung von Daten Minderjaehriger'
  }

  // 4. Automatisierte Entscheidungen (Scoring)
  const scoring = getAnswer(scopeAnswers, 'proc_adm_scoring')
  if (scoring === true || scoring === 'yes') {
    result.affectedRights.push('Recht auf nicht-automatisierte Entscheidung (Art. 22 DSGVO)')
    result.riskLevel = 'hoch'
    if (!result.title) result.title = 'DSFA — Automatisierte Einzelentscheidungen'
    result.measures.push('Menschliche Pruefung')
  }

  // 5. KI-Einsatz
  const aiUsage = getAnswer(scopeAnswers, 'proc_ai_usage')
  if (aiUsage === true || aiUsage === 'yes' || (Array.isArray(aiUsage) && aiUsage.length > 0)) {
    result.involvesAi = true
    result.measures.push('KI-Transparenz', 'Human Oversight')
    if (!result.title) result.title = 'DSFA — KI-gestuetzte Datenverarbeitung'
  }

  // 6. Videoueberwachung
  const video = getAnswer(scopeAnswers, 'proc_video_surveillance')
  if (video === true || video === 'yes') {
    result.dataCategories.push('Videoaufnahmen / Bilddaten')
    result.dataSubjects.push('Besucher', 'Mitarbeiter')
    if (!result.title) result.title = 'DSFA — Videoueberwachung'
  }

  // 7. Datenvolumen
  const volume = getAnswer(scopeAnswers, 'data_volume')
  if (volume === '100000-1000000' || volume === '>1000000') {
    result.riskLevel = 'hoch'
    result.description += 'Grosse Datenmengen erhoehen das Risiko fuer Betroffene. '
  }

  // 8. Branche + Geschaeftsmodell → Verarbeitungszweck
  if (profile?.industry?.length) {
    const ind = profile.industry[0]
    const purposeMap: Record<string, string> = {
      healthcare: 'Patientenversorgung und Gesundheitsdatenverarbeitung',
      finance: 'Finanzdienstleistungen und Bonitaetspruefung',
      education: 'Bildungsverwaltung und Schuelerbetreuung',
      tech: 'Software-Entwicklung und Cloud-Dienste',
      retail: 'Handel und Kundenbeziehungsmanagement',
      legal: 'Mandatsbearbeitung und Rechtsberatung',
    }
    result.processingPurpose = purposeMap[ind] || ''
    result.processingActivity = purposeMap[ind] || ''
  }

  if (profile?.businessModel === 'b2c') {
    result.dataSubjects.push('Endverbraucher')
    result.legalBasis = 'Art. 6 Abs. 1 lit. b DSGVO (Vertragserfuellung)'
  } else if (profile?.businessModel === 'b2b') {
    result.dataSubjects.push('Geschaeftskunden', 'Ansprechpartner')
    result.legalBasis = 'Art. 6 Abs. 1 lit. f DSGVO (Berechtigtes Interesse)'
  }

  // Deduplicate
  result.dataCategories = [...new Set(result.dataCategories)]
  result.dataSubjects = [...new Set(result.dataSubjects)]
  result.measures = [...new Set(result.measures)]
  result.affectedRights = [...new Set(result.affectedRights)]

  // Default title if nothing triggered
  if (!result.title) {
    result.title = `DSFA — ${profile?.companyName || 'Datenverarbeitung'}`
  }

  return result
}

/**
 * Check if DSFA is required based on scope answers (Art. 35 Abs. 3 triggers).
 */
export function isDSFARequired(scopeAnswers: ScopeProfilingAnswer[]): {
  required: boolean
  triggers: string[]
} {
  const triggers: string[] = []

  if (getAnswer(scopeAnswers, 'data_art9') === true || getAnswer(scopeAnswers, 'data_art9') === 'yes') {
    triggers.push('Besondere Datenkategorien (Art. 9 DSGVO)')
  }
  if (getAnswer(scopeAnswers, 'data_minors') === true || getAnswer(scopeAnswers, 'data_minors') === 'yes') {
    triggers.push('Daten Minderjaehriger (Art. 8 DSGVO)')
  }
  if (getAnswer(scopeAnswers, 'proc_adm_scoring') === true || getAnswer(scopeAnswers, 'proc_adm_scoring') === 'yes') {
    triggers.push('Automatisierte Einzelentscheidungen (Art. 22 DSGVO)')
  }
  if (getAnswer(scopeAnswers, 'proc_video_surveillance') === true || getAnswer(scopeAnswers, 'proc_video_surveillance') === 'yes') {
    triggers.push('Systematische Ueberwachung (Art. 35 Abs. 3 lit. c)')
  }
  const vol = getAnswer(scopeAnswers, 'data_volume')
  if (vol === '100000-1000000' || vol === '>1000000') {
    triggers.push('Umfangreiche Datenverarbeitung (Art. 35 Abs. 3 lit. b)')
  }

  return { required: triggers.length > 0, triggers }
}