// =============================================================================
// Loeschfristen Module - Policy Generator
// Generates deletion policies from profiling answers
// =============================================================================

import type { LoeschfristPolicy, StorageLocation } from './loeschfristen-types'
import { BASELINE_TEMPLATES, type BaselineTemplate, templateToPolicy } from './loeschfristen-baseline-catalog'
import type { ProfilingAnswer, ProfilingResult } from './loeschfristen-profiling-data'
import { PROFILING_STEPS } from './loeschfristen-profiling-data'

// Re-export ProfilingResult so callers can type-annotate
export type { ProfilingResult }

// =============================================================================
// HELPER FUNCTIONS
// =============================================================================

/**
 * Retrieve the value of a specific answer by question ID.
 */
export function getAnswerValue(answers: ProfilingAnswer[], questionId: string): unknown {
  const answer = answers.find(a => a.questionId === questionId)
  return answer?.value ?? undefined
}

/**
 * Check whether all required questions in a given step have been answered.
 */
export function isStepComplete(answers: ProfilingAnswer[], stepId: import('./loeschfristen-profiling-data').ProfilingStepId): boolean {
  const step = PROFILING_STEPS.find(s => s.id === stepId)
  if (!step) return false

  return step.questions
    .filter(q => q.required)
    .every(q => {
      const answer = answers.find(a => a.questionId === q.id)
      if (!answer) return false

      const val = answer.value
      if (val === undefined || val === null) return false
      if (typeof val === 'string' && val.trim() === '') return false
      if (Array.isArray(val) && val.length === 0) return false

      return true
    })
}

/**
 * Calculate overall profiling progress as a percentage (0-100).
 */
export function getProfilingProgress(answers: ProfilingAnswer[]): number {
  const totalRequired = PROFILING_STEPS.reduce(
    (sum, step) => sum + step.questions.filter(q => q.required).length,
    0
  )
  if (totalRequired === 0) return 100

  const answeredRequired = PROFILING_STEPS.reduce((sum, step) => {
    return (
      sum +
      step.questions.filter(q => q.required).filter(q => {
        const answer = answers.find(a => a.questionId === q.id)
        if (!answer) return false
        const val = answer.value
        if (val === undefined || val === null) return false
        if (typeof val === 'string' && val.trim() === '') return false
        if (Array.isArray(val) && val.length === 0) return false
        return true
      }).length
    )
  }, 0)

  return Math.round((answeredRequired / totalRequired) * 100)
}

// =============================================================================
// CORE GENERATOR
// =============================================================================

/**
 * Generate deletion policies based on the profiling answers.
 *
 * Logic:
 * - Match baseline templates based on boolean and categorical answers
 * - Deduplicate matched templates by templateId
 * - Convert matched templates to full LoeschfristPolicy objects
 * - Add additional storage locations (Cloud, Backup) if applicable
 * - Detect legal hold requirements
 */
export function generatePoliciesFromProfile(answers: ProfilingAnswer[]): ProfilingResult {
  const matchedTemplateIds = new Set<string>()

  const getBool = (questionId: string): boolean => {
    const val = getAnswerValue(answers, questionId)
    return val === true
  }

  const getString = (questionId: string): string => {
    const val = getAnswerValue(answers, questionId)
    return typeof val === 'string' ? val : ''
  }

  // Always-included templates (universally recommended)
  matchedTemplateIds.add('protokolle-gesellschafter')

  // HR data (data-hr = true)
  if (getBool('data-hr')) {
    matchedTemplateIds.add('personal-akten')
    matchedTemplateIds.add('gehaltsabrechnungen')
    matchedTemplateIds.add('zeiterfassung')
    matchedTemplateIds.add('bewerbungsunterlagen')
    matchedTemplateIds.add('krankmeldungen')
    matchedTemplateIds.add('schulungsnachweise')
  }

  // Buchhaltung (data-buchhaltung = true)
  if (getBool('data-buchhaltung')) {
    matchedTemplateIds.add('buchhaltungsbelege')
    matchedTemplateIds.add('rechnungen')
    matchedTemplateIds.add('steuererklaerungen')
  }

  // Vertraege (data-vertraege = true)
  if (getBool('data-vertraege')) {
    matchedTemplateIds.add('vertraege')
    matchedTemplateIds.add('geschaeftsbriefe')
    matchedTemplateIds.add('kundenstammdaten')
    matchedTemplateIds.add('kundenreklamationen')
    matchedTemplateIds.add('lieferantenbewertungen')
  }

  // Marketing (data-marketing = true)
  if (getBool('data-marketing')) {
    matchedTemplateIds.add('newsletter-einwilligungen')
    matchedTemplateIds.add('crm-kontakthistorie')
    matchedTemplateIds.add('cookie-consent-logs')
    matchedTemplateIds.add('social-media-daten')
  }

  // Video (data-video = true)
  if (getBool('data-video')) {
    matchedTemplateIds.add('videoueberwachung')
  }

  // Website (org-website = true)
  if (getBool('org-website')) {
    matchedTemplateIds.add('webserver-logs')
    matchedTemplateIds.add('cookie-consent-logs')
  }

  // Cloud (sys-cloud = true) → E-Mail-Archivierung
  if (getBool('sys-cloud')) {
    matchedTemplateIds.add('email-archivierung')
  }

  // Zutritt (sys-zutritt = true)
  if (getBool('sys-zutritt')) {
    matchedTemplateIds.add('zutrittsprotokolle')
  }

  // ERP/CRM (sys-erp = true)
  if (getBool('sys-erp')) {
    matchedTemplateIds.add('kundenstammdaten')
    matchedTemplateIds.add('crm-kontakthistorie')
  }

  // Backup (sys-backup = true)
  if (getBool('sys-backup')) {
    matchedTemplateIds.add('backup-daten')
  }

  // Gesundheitsdaten (special-gesundheit = true)
  if (getBool('special-gesundheit')) {
    matchedTemplateIds.add('krankmeldungen')
    matchedTemplateIds.add('betriebsarzt-doku')
  }

  // Resolve matched templates from catalog
  const matchedTemplates: BaselineTemplate[] = []
  for (const templateId of matchedTemplateIds) {
    const template = BASELINE_TEMPLATES.find(t => t.templateId === templateId)
    if (template) {
      matchedTemplates.push(template)
    }
  }

  // Convert to policies
  const generatedPolicies: LoeschfristPolicy[] = matchedTemplates.map(template =>
    templateToPolicy(template)
  )

  // Additional storage locations
  const additionalStorageLocations: StorageLocation[] = []

  if (getBool('sys-cloud')) {
    const cloudLocation: StorageLocation = {
      id: crypto.randomUUID(),
      name: 'Cloud-Speicher',
      type: 'CLOUD',
      isBackup: false,
      provider: null,
      deletionCapable: true,
    }
    additionalStorageLocations.push(cloudLocation)
    for (const policy of generatedPolicies) {
      policy.storageLocations.push({ ...cloudLocation, id: crypto.randomUUID() })
    }
  }

  if (getBool('sys-backup')) {
    const backupLocation: StorageLocation = {
      id: crypto.randomUUID(),
      name: 'Backup-System',
      type: 'BACKUP',
      isBackup: true,
      provider: null,
      deletionCapable: true,
    }
    additionalStorageLocations.push(backupLocation)
    for (const policy of generatedPolicies) {
      policy.storageLocations.push({ ...backupLocation, id: crypto.randomUUID() })
    }
  }

  // Legal Hold
  const hasLegalHoldRequirement = getBool('special-legal-hold')
  if (hasLegalHoldRequirement) {
    for (const policy of generatedPolicies) {
      policy.hasActiveLegalHold = true
      policy.deletionTrigger = 'LEGAL_HOLD'
    }
  }

  // Tag policies with profiling metadata
  const branche = getString('org-branche')
  const mitarbeiter = getString('org-mitarbeiter')

  for (const policy of generatedPolicies) {
    policy.tags = [
      ...policy.tags,
      'profiling-generated',
      ...(branche ? [`branche:${branche}`] : []),
      ...(mitarbeiter ? [`groesse:${mitarbeiter}`] : []),
    ]
  }

  return {
    matchedTemplates,
    generatedPolicies,
    additionalStorageLocations,
    hasLegalHoldRequirement,
  }
}

// =============================================================================
// COMPLIANCE SCOPE INTEGRATION
// =============================================================================

/**
 * Prefill Loeschfristen profiling answers from Compliance Scope Engine answers.
 * The Scope Engine acts as the "Single Source of Truth" for organizational questions.
 */
export function prefillFromScopeAnswers(
  scopeAnswers: import('./compliance-scope-types').ScopeProfilingAnswer[]
): ProfilingAnswer[] {
  const { exportToLoeschfristenAnswers } = require('./compliance-scope-profiling')
  const exported = exportToLoeschfristenAnswers(scopeAnswers) as Array<{ questionId: string; value: unknown }>
  return exported.map(item => ({
    questionId: item.questionId,
    value: item.value as string | string[] | boolean | number,
  }))
}

/**
 * Get the list of Loeschfristen question IDs that are prefilled from Scope answers.
 * These questions should show "Aus Scope-Analyse uebernommen" hint.
 */
export const SCOPE_PREFILLED_LF_QUESTIONS = [
  'org-branche',
  'org-mitarbeiter',
  'org-geschaeftsmodell',
  'org-website',
  'data-hr',
  'data-buchhaltung',
  'data-vertraege',
  'data-marketing',
  'data-video',
  'sys-cloud',
  'sys-erp',
]