/**
 * Anforderungs-Engine für Lieferanten (VDA-ISA 2027 Kap. 6, NIS2 Art. 21(2)(d)).
 * Schutzbedarf → Anforderungsstufe; flacher Anforderungskatalog mit
 * Status-Ableitung aus den hinterlegten Objekten; Gate-Logik & Konformität.
 */

export function supplierRef(refNo: number): string {
  return `L-${String(refNo).padStart(3, "0")}`;
}
export function serviceRef(refNo: number): string {
  return `S-${String(refNo).padStart(3, "0")}`;
}

/**
 * Hängt einen Query-Parameter an einen Basis-Pfad an und wählt automatisch
 * das richtige Trennzeichen (`?` oder `&`). Erlaubt, Detail-/Bearbeiten-Popups
 * sowohl auf /suppliers als auch auf /assets zu öffnen (backHref-Muster).
 */
export function withQuery(base: string, key: string, val: string): string {
  return `${base}${base.includes("?") ? "&" : "?"}${key}=${val}`;
}

export const SUPPLIER_LIFECYCLE_TONE = {
  ACTIVE: "ok",
  ONBOARDING: "info",
  UNDER_REVIEW: "warn",
  OFFBOARDED: "mut",
} as const;

const DAY = 24 * 3600 * 1000;
export function isExpired(d: Date | null | undefined): boolean {
  return !!d && d.getTime() < Date.now();
}
export function isExpiring(d: Date | null | undefined, days = 90): boolean {
  return !!d && d.getTime() - Date.now() < days * DAY;
}
export function isReviewDue(d: Date | null | undefined, days = 30): boolean {
  return !!d && d.getTime() < Date.now() + days * DAY;
}

/** Schutzbedarf 1(normal)/2(hoch)/3(sehr hoch) aus der höchsten C/I/A-Stufe. */
export type ProtectionLevel = 1 | 2 | 3;
export function protectionLevel(maxCia: number): ProtectionLevel {
  if (maxCia >= 4) return 3;
  if (maxCia >= 3) return 2;
  return 1;
}
export const PROTECTION_LABEL: Record<ProtectionLevel, string> = {
  1: "normal",
  2: "hoch",
  3: "sehr hoch",
};

/** Kontext für die Statusableitung — aus dem Lieferanten-Datensatz berechnet. */
export type ReqContext = {
  hasValidNda: boolean;
  ndaMonitored: boolean;
  hasSecurityContract: boolean;
  customerReqPassed: boolean;
  hasFlowdown: boolean;
  hasAssessment: boolean;
  hasReviewedAssessment: boolean;
  hasAdequateEvidence: boolean;
  complianceMonitored: boolean;
  hasLinkedRisk: boolean;
  hasManagementDecision: boolean;
  hasAudit: boolean;
};

export type Tier = "must" | "should" | "high" | "veryhigh";
export type ReqStatus = "met" | "partial" | "open" | "na";
export type ReqTheme = "contract" | "assessment" | "transparency";

export type Requirement = {
  key: string;
  label: string;
  control: "6.1.1" | "6.1.2" | "6.1.3";
  tier: Tier;
  theme: ReqTheme;
  met: (c: ReqContext) => boolean;
  refLabel?: (c: ReqContext) => string | null;
};

export const REQUIREMENTS: Requirement[] = [
  // Vertrag & Geheimhaltung
  { key: "nda_valid", label: "NDA abgeschlossen und gültig", control: "6.1.2", tier: "must", theme: "contract", met: (c) => c.hasValidNda },
  { key: "infosec_contract", label: "Vertragliche InfoSec-Vereinbarung geschlossen", control: "6.1.1", tier: "must", theme: "contract", met: (c) => c.hasSecurityContract },
  { key: "customer_req_passed", label: "Kundenanforderungen an Partner weitergegeben", control: "6.1.1", tier: "must", theme: "contract", met: (c) => c.customerReqPassed },
  { key: "flowdown", label: "Flow-down an Subunternehmer verpflichtet", control: "6.1.1", tier: "should", theme: "contract", met: (c) => c.hasFlowdown },
  { key: "nda_monitoring", label: "NDA-Fristen-Monitoring aktiv", control: "6.1.2", tier: "should", theme: "contract", met: (c) => c.ndaMonitored },
  // Bewertung & Nachweise
  { key: "risk_assessment", label: "Sicherheits-Risikobewertung durchgeführt", control: "6.1.1", tier: "must", theme: "assessment", met: (c) => c.hasAssessment || c.hasLinkedRisk },
  { key: "reports_reviewed", label: "Service-Reports & Dokumente geprüft", control: "6.1.1", tier: "should", theme: "assessment", met: (c) => c.hasReviewedAssessment },
  { key: "adequate_evidence", label: "Nachweis angemessenes Sicherheitsniveau (Zertifikat/Audit)", control: "6.1.1", tier: "high", theme: "assessment", met: (c) => c.hasAdequateEvidence },
  { key: "compliance_monitored", label: "Compliance-Grad dokumentiert & anlassbezogen überwacht", control: "6.1.1", tier: "high", theme: "assessment", met: (c) => c.complianceMonitored },
  // Transparenz / sehr hoch
  { key: "customer_transparency", label: "Kundentransparenz zu Lieferkettenrisiken erfüllt", control: "6.1.1", tier: "veryhigh", theme: "transparency", met: (c) => c.customerReqPassed },
];

const TIER_MIN_LEVEL: Record<Tier, ProtectionLevel> = { must: 1, should: 1, high: 2, veryhigh: 3 };

export function tierActive(tier: Tier, level: ProtectionLevel): boolean {
  return level >= TIER_MIN_LEVEL[tier];
}

export function requirementStatus(req: Requirement, ctx: ReqContext, level: ProtectionLevel): ReqStatus {
  if (!tierActive(req.tier, level)) return "na";
  return req.met(ctx) ? "met" : "open";
}

/** Gate: sehr hoher Schutzbedarf ohne gültiges Audit/Label → Kompensation nötig. */
export function gateActive(level: ProtectionLevel, ctx: ReqContext): boolean {
  return level === 3 && !ctx.hasAudit;
}
export function gateSatisfied(ctx: ReqContext): boolean {
  return ctx.hasAudit || (ctx.hasManagementDecision && ctx.hasLinkedRisk);
}

export type Conformity = "conform" | "partial" | "gaps" | "action";

export function conformity(level: ProtectionLevel, ctx: ReqContext): Conformity {
  if (gateActive(level, ctx) && !gateSatisfied(ctx)) return "action";
  const active = REQUIREMENTS.filter((r) => tierActive(r.tier, level));
  const met = active.filter((r) => r.met(ctx)).length;
  if (met === active.length) return "conform";
  if (met >= Math.ceil(active.length * 0.6)) return "partial";
  return "gaps";
}

export const CONFORMITY_TONE: Record<Conformity, "ok" | "warn" | "risk"> = {
  conform: "ok",
  partial: "warn",
  gaps: "risk",
  action: "risk",
};
export const CONFORMITY_LABEL: Record<Conformity, string> = {
  conform: "Konform",
  partial: "Teilweise",
  gaps: "Lücken offen",
  action: "Handlung nötig",
};

/** Berechneter Reifegrad (0–3) aus Erfüllungsgrad der aktiven Anforderungen. */
export function computedMaturity(level: ProtectionLevel, ctx: ReqContext): number {
  const active = REQUIREMENTS.filter((r) => tierActive(r.tier, level));
  if (active.length === 0) return 0;
  const met = active.filter((r) => r.met(ctx)).length;
  return Math.round((met / active.length) * 3 * 10) / 10;
}

export const TARGET_MATURITY = 3.0;

type CtxInput = {
  contracts: { securityClauses: boolean; flowdown: boolean; customerRequirementsPassed: boolean }[];
  ndas: { validTo: Date | null }[];
  evidence: { kind: string; adequacyChecked: boolean; validTo: Date | null }[];
  assessments: { result: string | null; nextReview: Date | null }[];
  subcontractors: { flowdownObligation: boolean }[];
  nextReview: Date | null;
  linkedRiskCount: number;
  decisionCount: number;
};

/** Baut den ReqContext aus den hinterlegten Lieferanten-Objekten. */
export function buildReqContext(d: CtxInput): ReqContext {
  const hasAudit = d.evidence.some(
    (e) =>
      (e.kind === "AUDIT_REPORT" || e.kind === "TISAX_LABEL") &&
      e.adequacyChecked &&
      !isExpired(e.validTo)
  );
  const hasAdequateEvidence = d.evidence.some((e) => e.adequacyChecked && !isExpired(e.validTo));
  return {
    hasValidNda: d.ndas.some((n) => !isExpired(n.validTo)),
    ndaMonitored: d.ndas.length > 0 && !!d.nextReview,
    hasSecurityContract: d.contracts.some((c) => c.securityClauses),
    customerReqPassed: d.contracts.some((c) => c.customerRequirementsPassed),
    hasFlowdown: d.contracts.some((c) => c.flowdown) || d.subcontractors.some((s) => s.flowdownObligation),
    hasAssessment: d.assessments.length > 0,
    hasReviewedAssessment: d.assessments.some((a) => !!a.result),
    hasAdequateEvidence,
    complianceMonitored: d.assessments.some((a) => !!a.nextReview),
    hasLinkedRisk: d.linkedRiskCount > 0,
    hasManagementDecision: d.decisionCount > 0,
    hasAudit,
  };
}