// Human-readable display for regulations. Maps messy codes/short-names to a stable FAMILY key +
// friendly label (+ chapter for multi-part works like the DSK SDM). Presentation layer only:
// it bridges G2 (clean RAG metadata) and keeps working once codes are clean. Extend the table freely.

export interface RegulationRef {
  code?: string
  name?: string
  short?: string
}

export interface RegulationDisplay {
  familyKey: string // stable key used to GROUP evidence
  familyLabel: string // human-readable regulation name
  chapter?: string // e.g. "B51" for a DSK SDM building block
}

interface Rule {
  test: RegExp
  key: string
  label: string
  chapter?: RegExp
}

// Order matters: more specific patterns first.
const RULES: Rule[] = [
  {
    test: /dsk.?sdm|standard.?datenschutzmodell|(^|[^a-z])sdm([^a-z]|$)/i,
    key: 'dsk_sdm',
    label: 'DSK Standard-Datenschutzmodell (SDM)',
    chapter: /\b([A-Z]\d{1,3})\b/,
  },
  { test: /cyber.?resilience|(^|[^a-z])cra([^a-z]|$)/i, key: 'cra', label: 'Cyber Resilience Act (CRA)' },
  { test: /(^|[^a-z])nis.?2([^a-z]|$)/i, key: 'nis2', label: 'NIS2-Richtlinie' },
  { test: /data.?privacy.?framework|(^|[^a-z])dpf([^a-z]|$)/i, key: 'dpf', label: 'EU-US Data Privacy Framework' },
  { test: /maschinen|2023.?1230/i, key: 'maschinenvo', label: 'Maschinenverordnung (EU) 2023/1230' },
  { test: /ds.?gvo|gdpr/i, key: 'dsgvo', label: 'DSGVO – Datenschutz-Grundverordnung' },
  { test: /(^|[^a-z])bdsg([^a-z]|$)/i, key: 'bdsg', label: 'BDSG – Bundesdatenschutzgesetz' },
  { test: /tdddg|ttdsg/i, key: 'tddg', label: 'TDDDG (Digitale-Dienste-Datenschutz)' },
  { test: /edpb|edsa|(^|[^a-z])wp\s?\d+/i, key: 'edpb', label: 'EDPB / DSK Leitlinien' },
  { test: /(^|[^a-z])bsi([^a-z]|$)/i, key: 'bsi', label: 'BSI' },
]

export function resolveRegulation(reg: RegulationRef): RegulationDisplay {
  const hay = `${reg.code || ''} ${reg.short || ''} ${reg.name || ''}`
  for (const r of RULES) {
    if (r.test.test(hay)) {
      const chapter = r.chapter
        ? r.chapter.exec(reg.short || reg.code || '')?.[1] || undefined
        : undefined
      return { familyKey: r.key, familyLabel: r.label, chapter }
    }
  }
  return {
    familyKey: reg.code || reg.short || 'unknown',
    familyLabel: reg.short || reg.name || reg.code || 'Regelwerk',
  }
}