/**
 * Template Recommendations — Maps scope answers to document templates
 *
 * Bridges the gap between the Compliance Scope Engine (23 ScopeDocumentTypes)
 * and the Document Generator (70+ database templates).
 *
 * The scope engine recommends high-level document categories (vvt, tom, dsfa...).
 * This module recommends SPECIFIC templates based on additional context from
 * the CompanyProfile and scope answers.
 */

import type { ComplianceDepthLevel } from '../../lib/sdk/compliance-scope-types/core-levels'
import type { ScopeProfilingAnswer } from '../../lib/sdk/compliance-scope-types/state'

// ============================================================================
// Template recommendation rules
// ============================================================================

interface TemplateRule {
  /** Database document_type */
  templateType: string
  /** Human-readable label */
  label: string
  /** When to recommend this template */
  condition: (answers: Map<string, string>, level: ComplianceDepthLevel, profile: Record<string, unknown>) => 'required' | 'recommended' | 'optional' | null
}

/**
 * Rules that map scope answers + profile to specific template recommendations.
 * These cover templates NOT directly output by the scope engine.
 */
const TEMPLATE_RULES: TemplateRule[] = [
  // ── HR-DSI ──────────────────────────────────────────────────────────────
  {
    templateType: 'employee_dsi',
    label: 'Mitarbeiter-Datenschutzinformation',
    condition: (answers, level) => {
      const empCount = answers.get('org_employee_count')
      if (empCount && empCount !== 'none' && empCount !== '0') return level >= 'L2' ? 'required' : 'recommended'
      return null
    },
  },
  {
    templateType: 'applicant_dsi',
    label: 'Bewerber-Datenschutzinformation',
    condition: (answers, level) => {
      const empCount = answers.get('org_employee_count')
      if (empCount && empCount !== 'none' && empCount !== '0') return level >= 'L2' ? 'recommended' : 'optional'
      return null
    },
  },

  // ── Whistleblower ───────────────────────────────────────────────────────
  {
    templateType: 'whistleblower_policy',
    label: 'Hinweisgeberrichtlinie (HinSchG)',
    condition: (answers) => {
      const empCount = answers.get('org_employee_count')
      // HinSchG Pflicht ab 50 MA
      if (empCount === '50_249' || empCount === '250_999' || empCount === '1000_plus') return 'required'
      return null
    },
  },

  // ── KI ──────────────────────────────────────────────────────────────────
  {
    templateType: 'ai_usage_policy',
    label: 'KI-Nutzungsrichtlinie',
    condition: (answers) => {
      const aiUsage = answers.get('proc_ai_usage')
      if (aiUsage && aiUsage !== 'none' && aiUsage !== 'no') return 'required'
      return null
    },
  },

  // ── BYOD ────────────────────────────────────────────────────────────────
  {
    templateType: 'byod_policy',
    label: 'BYOD-Richtlinie',
    condition: (answers, level) => {
      // BYOD relevant fuer Unternehmen mit Mitarbeitern
      if (level >= 'L3') return 'recommended'
      return 'optional'
    },
  },

  // ── Social Media ────────────────────────────────────────────────────────
  {
    templateType: 'social_media_dsi',
    label: 'Social-Media-Datenschutzinformation',
    condition: (_answers, level) => {
      // Fast jedes Unternehmen hat Social Media
      return level >= 'L2' ? 'recommended' : 'optional'
    },
  },

  // ── Videokonferenzen ────────────────────────────────────────────────────
  {
    templateType: 'video_conference_dsi',
    label: 'Videokonferenz-Datenschutzinformation',
    condition: (_answers, level) => {
      if (level >= 'L3') return 'recommended'
      return 'optional'
    },
  },

  // ── Security Policies (nur ab L3/L4) ───────────────────────────────────
  {
    templateType: 'information_security_policy',
    label: 'Informationssicherheitsrichtlinie',
    condition: (_answers, level) => {
      if (level >= 'L3') return 'required'
      if (level === 'L2') return 'recommended'
      return null
    },
  },
  {
    templateType: 'password_policy',
    label: 'Passwortrichtlinie',
    condition: (_answers, level) => level >= 'L2' ? 'recommended' : 'optional',
  },
  {
    templateType: 'encryption_policy',
    label: 'Verschluesselungsrichtlinie',
    condition: (_answers, level) => level >= 'L3' ? 'recommended' : 'optional',
  },
  {
    templateType: 'access_control_policy',
    label: 'Zugriffskontrollrichtlinie',
    condition: (_answers, level) => level >= 'L3' ? 'recommended' : 'optional',
  },

  // ── Security Concepts (nur ab L3) ──────────────────────────────────────
  {
    templateType: 'it_security_concept',
    label: 'IT-Sicherheitskonzept',
    condition: (_answers, level) => level >= 'L3' ? 'required' : 'optional',
  },
  {
    templateType: 'backup_recovery_concept',
    label: 'Backup-Recovery-Konzept',
    condition: (_answers, level) => level >= 'L3' ? 'recommended' : 'optional',
  },
  {
    templateType: 'logging_concept',
    label: 'Logging-Konzept',
    condition: (_answers, level) => level >= 'L3' ? 'recommended' : 'optional',
  },
  {
    templateType: 'access_control_concept',
    label: 'Zugriffskonzept',
    condition: (_answers, level) => level >= 'L3' ? 'recommended' : 'optional',
  },

  // ── Plattform/UGC ──────────────────────────────────────────────────────
  {
    templateType: 'community_guidelines',
    label: 'Gemeinschaftsrichtlinien',
    condition: (answers) => {
      const model = answers.get('org_business_model')
      if (model === 'platform' || model === 'marketplace' || model === 'social') return 'required'
      return null
    },
  },
  {
    templateType: 'terms_of_use',
    label: 'Nutzungsbedingungen',
    condition: (answers) => {
      const model = answers.get('org_business_model')
      if (model === 'platform' || model === 'marketplace' || model === 'social' || model === 'saas') return 'required'
      return null
    },
  },
  {
    templateType: 'media_content_policy',
    label: 'Medien- und Inhalte-Richtlinie',
    condition: (answers) => {
      const model = answers.get('org_business_model')
      if (model === 'platform' || model === 'media') return 'recommended'
      return null
    },
  },

  // ── E-Commerce ─────────────────────────────────────────────────────────
  {
    templateType: 'widerruf',
    label: 'Widerrufsbelehrung',
    condition: (answers) => {
      const shop = answers.get('prod_webshop')
      if (shop && shop !== 'no') return 'required'
      return null
    },
  },
  {
    templateType: 'consent_texts',
    label: 'Einwilligungstexte (Double-Opt-In)',
    condition: (answers) => {
      const consent = answers.get('prod_consent_management')
      if (consent && consent !== 'no') return 'recommended'
      return 'optional'
    },
  },

  // ── Impressum + Cookie ─────────────────────────────────────────────────
  {
    templateType: 'impressum',
    label: 'Impressum',
    condition: () => 'required', // Immer Pflicht
  },
  {
    templateType: 'cookie_policy',
    label: 'Cookie-Richtlinie',
    condition: () => 'required', // Immer Pflicht bei Websites
  },

  // ── Drittlandtransfer (SCC + TIA) ───────────────────────────────────────
  // SCC+TIA nur erforderlich wenn Drittlandtransfer OHNE Angemessenheitsbeschluss/DPF
  {
    templateType: 'transfer_impact_assessment',
    label: 'Transfer Impact Assessment (TIA)',
    condition: (answers) => {
      const thirdCountry = answers.get('tech_third_country')
      if (!thirdCountry || thirdCountry === 'no') return null
      // Wenn nur DPF-zertifizierte US-Anbieter: empfohlen statt pflicht
      if (thirdCountry === 'us_dpf_only') return 'optional'
      // Wenn nur Laender mit Angemessenheitsbeschluss: nicht noetig
      if (thirdCountry === 'adequate_only') return null
      return 'required'
    },
  },
  {
    templateType: 'scc_companion',
    label: 'Standardvertragsklauseln (SCC) — Anhaenge',
    condition: (answers) => {
      const thirdCountry = answers.get('tech_third_country')
      if (!thirdCountry || thirdCountry === 'no') return null
      if (thirdCountry === 'us_dpf_only') return 'optional'
      if (thirdCountry === 'adequate_only') return null
      return 'required'
    },
  },

  // ── ISMS (nur bei Zertifizierungsziel) ─────────────────────────────────
  {
    templateType: 'isms_manual',
    label: 'ISMS-Handbuch',
    condition: (answers) => {
      const cert = answers.get('org_cert_target')
      if (cert === 'iso27001' || cert === 'iso27701' || cert === 'tisax') return 'required'
      return null
    },
  },

  // ── Vendor/BCM (nur ab L4 oder bei Vendor-Management) ─────────────────
  {
    templateType: 'vendor_risk_management_policy',
    label: 'Vendor-Risikomanagement',
    condition: (answers, level) => {
      const vendor = answers.get('comp_vendor_management')
      if (vendor && vendor !== 'no') return 'recommended'
      if (level === 'L4') return 'required'
      return null
    },
  },
  {
    templateType: 'business_continuity_policy',
    label: 'Business-Continuity-Richtlinie',
    condition: (_answers, level) => level === 'L4' ? 'required' : 'optional',
  },
]

// ============================================================================
// Public API
// ============================================================================

export interface TemplateRecommendation {
  templateType: string
  label: string
  requirement: 'required' | 'recommended' | 'optional'
}

/**
 * Evaluates all template rules against the user's scope answers and profile.
 * Returns a prioritized list of template recommendations.
 */
export function evaluateTemplateRecommendations(
  scopeAnswers: ScopeProfilingAnswer[],
  level: ComplianceDepthLevel,
  profile: Record<string, unknown> = {},
): TemplateRecommendation[] {
  const answerMap = new Map<string, string>()
  for (const a of scopeAnswers) {
    answerMap.set(a.questionId, String(a.value))
  }

  const results: TemplateRecommendation[] = []

  for (const rule of TEMPLATE_RULES) {
    const requirement = rule.condition(answerMap, level, profile)
    if (requirement) {
      results.push({
        templateType: rule.templateType,
        label: rule.label,
        requirement,
      })
    }
  }

  // Sort: required first, then recommended, then optional
  const order = { required: 0, recommended: 1, optional: 2 }
  results.sort((a, b) => order[a.requirement] - order[b.requirement])

  return results
}