// ISMS-Tool — Prisma-Schema
// Fundament (Iteration 1): Mandanten, Nutzer, RBAC, Audit-Log.
// Fachliche Entitäten (Assets, BIA, Risiken, …) folgen je Iteration — siehe docs/SPEC.md §5.
//
// Multi-Tenant-Regel: Jede fachliche Tabelle trägt tenantId. Zugriff nur über den
// zentralen Tenant-Guard (src/server/db.ts); zusätzlich Postgres RLS (prisma/rls.sql).

generator client {
  provider        = "prisma-client-js"
  previewFeatures = ["postgresqlExtensions"]
}

datasource db {
  provider   = "postgresql"
  extensions = [pgvector(map: "vector")]
}

enum TenantStatus {
  ACTIVE
  SUSPENDED
}

enum UserStatus {
  ACTIVE
  INVITED
  LOCKED
  DEACTIVATED
}

model Tenant {
  id        String       @id @default(cuid())
  name      String
  slug      String       @unique
  status    TenantStatus @default(ACTIVE)
  config    Json         @default("{}")
  createdAt DateTime     @default(now()) @map("created_at")
  updatedAt DateTime     @updatedAt @map("updated_at")

  users     User[]
  roles     Role[]
  auditLogs AuditLog[]

  @@map("tenants")
}

model User {
  id           String     @id @default(cuid())
  tenantId     String     @map("tenant_id")
  email        String
  passwordHash String     @map("password_hash")
  name         String
  status       UserStatus @default(ACTIVE)
  mfaSecret    String?    @map("mfa_secret")
  // Plattform-Admin ist mandantenübergreifend (Betreiberrolle)
  isPlatformAdmin Boolean @default(false) @map("is_platform_admin")
  createdAt    DateTime   @default(now()) @map("created_at")
  updatedAt    DateTime   @updatedAt @map("updated_at")

  tenant         Tenant     @relation(fields: [tenantId], references: [id])
  userRoles      UserRole[]
  ownedAssets    Asset[]    @relation("assetOwner")
  ownedProcesses Process[]  @relation("processOwner")
  ownedRisks     Risk[]     @relation("riskOwner")
  ownedMeasures  Measure[]  @relation("measureOwner")

  @@unique([tenantId, email])
  @@index([tenantId])
  @@map("users")
}

model Role {
  id       String @id @default(cuid())
  tenantId String @map("tenant_id")
  key      String // z. B. tenant-admin, isb, auditor, owner, user
  name     String

  tenant          Tenant           @relation(fields: [tenantId], references: [id])
  userRoles       UserRole[]
  rolePermissions RolePermission[]

  @@unique([tenantId, key])
  @@index([tenantId])
  @@map("roles")
}

model Permission {
  id  String @id @default(cuid())
  key String @unique // z. B. asset:read, risk:write, incident:manage

  rolePermissions RolePermission[]

  @@map("permissions")
}

model UserRole {
  userId String @map("user_id")
  roleId String @map("role_id")

  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
  role Role @relation(fields: [roleId], references: [id], onDelete: Cascade)

  @@id([userId, roleId])
  @@map("user_roles")
}

model RolePermission {
  roleId       String @map("role_id")
  permissionId String @map("permission_id")

  role       Role       @relation(fields: [roleId], references: [id], onDelete: Cascade)
  permission Permission @relation(fields: [permissionId], references: [id], onDelete: Cascade)

  @@id([roleId, permissionId])
  @@map("role_permissions")
}

// ── Assets & BIA (ein Modul, SPEC §4.1) ─────────────────────────────────────

enum AssetType {
  INFORMATION
  SYSTEM
  APPLICATION
  LOCATION
  SUPPLIER
  PERSON
  DATA
}

enum AssetStatus {
  ACTIVE
  PLANNED
  RETIRED
}

enum ProcessAssetRole {
  PRIMARY
  SECONDARY
}

enum ProcessCategory {
  CORE       // Kernprozess
  MANAGEMENT // Managementprozess
  SUPPORT    // Unterstützender Prozess
}

model Asset {
  id          String      @id @default(cuid())
  tenantId    String      @map("tenant_id")
  name        String
  description String?
  type        AssetType
  status      AssetStatus @default(ACTIVE)
  ownerId     String?     @map("owner_id")
  location    String?
  tags        String[]    @default([])
  // Schutzbedarf 1–4 je Schutzziel (C/I/A)
  confidentiality Int @default(1)
  integrity       Int @default(1)
  availability    Int @default(1)
  createdAt DateTime @default(now()) @map("created_at")
  updatedAt DateTime @updatedAt @map("updated_at")
  createdBy String?  @map("created_by")

  owner         User?           @relation("assetOwner", fields: [ownerId], references: [id])
  relationsFrom AssetRelation[] @relation("relationFrom")
  relationsTo   AssetRelation[] @relation("relationTo")
  processAssets ProcessAsset[]
  riskAssets    RiskAsset[]
  supplierLinks SupplierAsset[]

  @@index([tenantId])
  @@index([tenantId, type])
  @@map("assets")
}

model AssetRelation {
  id             String @id @default(cuid())
  tenantId       String @map("tenant_id")
  assetId        String @map("asset_id")
  relatedAssetId String @map("related_asset_id")
  // z. B. depends_on, hosts, processes_data_of
  type           String @default("depends_on")

  asset        Asset @relation("relationFrom", fields: [assetId], references: [id], onDelete: Cascade)
  relatedAsset Asset @relation("relationTo", fields: [relatedAssetId], references: [id], onDelete: Cascade)

  @@unique([assetId, relatedAssetId, type])
  @@index([tenantId])
  @@map("asset_relations")
}

model Process {
  id          String          @id @default(cuid())
  tenantId    String          @map("tenant_id")
  name        String
  description String?
  category    ProcessCategory @default(CORE)
  ownerId     String?         @map("owner_id")
  createdAt   DateTime @default(now()) @map("created_at")
  updatedAt   DateTime @updatedAt @map("updated_at")
  createdBy   String?  @map("created_by")

  owner         User?          @relation("processOwner", fields: [ownerId], references: [id])
  processAssets ProcessAsset[]
  bia           BiaEntry?
  risks         Risk[]

  @@index([tenantId])
  @@map("processes")
}

model ProcessAsset {
  id        String           @id @default(cuid())
  tenantId  String           @map("tenant_id")
  processId String           @map("process_id")
  assetId   String           @map("asset_id")
  role      ProcessAssetRole @default(SECONDARY)

  process Process @relation(fields: [processId], references: [id], onDelete: Cascade)
  asset   Asset   @relation(fields: [assetId], references: [id], onDelete: Cascade)

  @@unique([processId, assetId])
  @@index([tenantId])
  @@map("process_assets")
}

model BiaEntry {
  id        String @id @default(cuid())
  tenantId  String @map("tenant_id")
  processId String @unique @map("process_id")
  // Wiederanlaufparameter in Stunden (SPEC §4.1.2)
  rtoHours Int? @map("rto_hours")
  rpoHours Int? @map("rpo_hours")
  mtdHours Int? @map("mtd_hours")
  // Schadenshöhe 1–4 je Schutzziel
  impactC Int @default(1) @map("impact_c")
  impactI Int @default(1) @map("impact_i")
  impactA Int @default(1) @map("impact_a")
  // Kritikalität 1–4, abgeleitet (Max-Prinzip), redundant gespeichert für Listen/Filter
  criticality Int      @default(1)
  notes       String?
  createdAt   DateTime @default(now()) @map("created_at")
  updatedAt   DateTime @updatedAt @map("updated_at")

  process Process @relation(fields: [processId], references: [id], onDelete: Cascade)

  @@index([tenantId])
  @@map("bia_entries")
}

// ── Risikoanalyse (SPEC §4.2) ───────────────────────────────────────────────

enum RiskTreatment {
  AVOID    // Vermeiden
  MITIGATE // Vermindern
  TRANSFER // Übertragen
  ACCEPT   // Akzeptieren
}

enum RiskStatus {
  OPEN
  IN_TREATMENT
  ACCEPTED
  CLOSED
}

model Risk {
  id       String @id @default(cuid())
  tenantId String @map("tenant_id")
  // Laufende Nummer je Mandant → Anzeige als "R-001"
  refNo    Int    @map("ref_no")

  title         String
  description   String?
  threat        String? // Bedrohung (Katalog folgt, SPEC §5)
  vulnerability String? // Schwachstelle

  // Brutto-Bewertung: Eintrittswahrscheinlichkeit × Auswirkung (je 1–5)
  likelihood Int @default(1)
  impact     Int @default(1)
  score      Int @default(1) // redundant für Listen/Heatmap

  // Rest-Risiko nach Maßnahmen (berechnet, dezimal wegen Teil-Minderungen)
  residualLikelihood Float? @map("residual_likelihood")
  residualImpact     Float? @map("residual_impact")
  residualScore      Float? @map("residual_score")

  treatment RiskTreatment @default(MITIGATE)
  status    RiskStatus    @default(OPEN)
  ownerId   String?       @map("owner_id")
  processId String?       @map("process_id")

  createdAt DateTime @default(now()) @map("created_at")
  updatedAt DateTime @updatedAt @map("updated_at")
  createdBy String?  @map("created_by")

  owner        User?         @relation("riskOwner", fields: [ownerId], references: [id])
  process      Process?      @relation(fields: [processId], references: [id])
  riskAssets   RiskAsset[]
  riskMeasures RiskMeasure[]

  @@unique([tenantId, refNo])
  @@index([tenantId])
  @@index([tenantId, status])
  @@map("risks")
}

model RiskAsset {
  id       String @id @default(cuid())
  tenantId String @map("tenant_id")
  riskId   String @map("risk_id")
  assetId  String @map("asset_id")

  risk  Risk  @relation(fields: [riskId], references: [id], onDelete: Cascade)
  asset Asset @relation(fields: [assetId], references: [id], onDelete: Cascade)

  @@unique([riskId, assetId])
  @@index([tenantId])
  @@map("risk_assets")
}

// ── Maßnahmen (SPEC §4.4) ───────────────────────────────────────────────────

enum MeasureStatus {
  OPEN
  IN_PROGRESS
  DONE
}

enum MeasurePriority {
  LOW
  MEDIUM
  HIGH
}

model Measure {
  id       String @id @default(cuid())
  tenantId String @map("tenant_id")
  refNo    Int    @map("ref_no") // Anzeige als "M-001"

  title       String
  description String?
  status      MeasureStatus   @default(OPEN)
  priority    MeasurePriority @default(MEDIUM)
  ownerId     String?         @map("owner_id")
  dueDate     DateTime?       @map("due_date")

  createdAt DateTime @default(now()) @map("created_at")
  updatedAt DateTime @updatedAt @map("updated_at")
  createdBy String?  @map("created_by")

  owner        User?         @relation("measureOwner", fields: [ownerId], references: [id])
  riskMeasures RiskMeasure[]

  @@unique([tenantId, refNo])
  @@index([tenantId])
  @@index([tenantId, status])
  @@map("measures")
}

// Verknüpfung Risiko ↔ Maßnahme inkl. erwarteter Risikominderung:
// Das Rest-Risiko wird aus likelihood/impact minus der Summe der
// Minderungen aller verknüpften Maßnahmen berechnet (siehe src/server/risk-calc.ts).
model RiskMeasure {
  id        String @id @default(cuid())
  tenantId  String @map("tenant_id")
  riskId    String @map("risk_id")
  measureId String @map("measure_id")

  // Minderung je Dimension (0,00–4,00) — mehrere Maßnahmen summieren sich,
  // bis ein voller Punkt (oder mehr) erreicht ist
  reductionLikelihood Float @default(0) @map("reduction_likelihood")
  reductionImpact     Float @default(0) @map("reduction_impact")

  risk    Risk    @relation(fields: [riskId], references: [id], onDelete: Cascade)
  measure Measure @relation(fields: [measureId], references: [id], onDelete: Cascade)

  @@unique([riskId, measureId])
  @@index([tenantId])
  @@map("risk_measures")
}

// Globale Kataloge (SPEC §5: Threat/Vulnerability, mandantenübergreifend).
// Risiken speichern weiterhin Freitext — der Katalog liefert Vorschläge (datalist),
// eigene Formulierungen bleiben möglich.
model Threat {
  id   String @id @default(cuid())
  name String @unique

  @@map("threats")
}

model Vulnerability {
  id   String @id @default(cuid())
  name String @unique

  @@map("vulnerabilities")
}

// ── Lieferantenmanagement (SPEC §4.14, VDA-ISA 2027 Kap. 6, NIS2 Art. 21(2)(d)) ──

enum SupplierStatus {
  ACTIVE
  ONBOARDING
  UNDER_REVIEW
  OFFBOARDED
}

enum AssessmentType {
  QUESTIONNAIRE
  SELF_ASSESSMENT
  AUDIT
}

enum AssessmentStatus {
  SENT
  RECEIVED
  EVALUATED
  OVERDUE
}

enum EvidenceKind {
  CERTIFICATE
  TISAX_LABEL
  ATTESTATION
  AUDIT_REPORT
  SELF_ASSESSMENT
}

enum ResponsibleParty {
  CLIENT
  SUPPLIER
  SHARED
}

model Supplier {
  id       String @id @default(cuid())
  tenantId String @map("tenant_id")
  refNo    Int    @map("ref_no") // Anzeige "L-001"

  name           String
  sector         String?
  services       String? // erbrachte Leistung / IT-Services
  criticality    Int            @default(1) // 1–4
  dataCategories String[]       @default([]) @map("data_categories")
  // Schutzbedarf der verarbeiteten Informationen (C/I/A 1–4)
  confidentiality Int           @default(1)
  integrity       Int           @default(1)
  availability    Int           @default(1)
  nis2Relevant   Boolean        @default(false) @map("nis2_relevant") // Teil der Lieferkette
  status         SupplierStatus @default(ACTIVE)
  contact        String?
  nextReview     DateTime?      @map("next_review")
  notes          String?

  createdAt DateTime @default(now()) @map("created_at")
  updatedAt DateTime @updatedAt @map("updated_at")
  createdBy String?  @map("created_by")

  assessments      SupplierAssessment[]
  contracts        Contract[]
  ndas             Nda[]
  evidence         SupplierEvidence[]
  responsibilities ServiceResponsibility[]
  subcontractors   Subcontractor[]
  decisions        ManagementDecision[]
  controlMaturity  SupplierControlMaturity[]
  assetLinks       SupplierAsset[]

  @@unique([tenantId, refNo])
  @@index([tenantId])
  @@map("suppliers")
}

// Lieferant ↔ Asset (welcher Dienstleister betrifft welche Assets) — speist den Graph
model SupplierAsset {
  id         String @id @default(cuid())
  tenantId   String @map("tenant_id")
  supplierId String @map("supplier_id")
  assetId    String @map("asset_id")

  supplier Supplier @relation(fields: [supplierId], references: [id], onDelete: Cascade)
  asset    Asset    @relation(fields: [assetId], references: [id], onDelete: Cascade)

  @@unique([supplierId, assetId])
  @@index([tenantId])
  @@map("supplier_assets")
}

model SupplierAssessment {
  id         String           @id @default(cuid())
  tenantId   String           @map("tenant_id")
  supplierId String           @map("supplier_id")
  type       AssessmentType
  status     AssessmentStatus @default(SENT)
  score      Int? // 0–100 Scoring
  date       DateTime?
  nextReview DateTime?        @map("next_review")
  result     String?
  createdAt  DateTime         @default(now()) @map("created_at")

  supplier Supplier @relation(fields: [supplierId], references: [id], onDelete: Cascade)

  @@index([tenantId])
  @@map("supplier_assessments")
}

model Contract {
  id                  String    @id @default(cuid())
  tenantId            String    @map("tenant_id")
  supplierId          String    @map("supplier_id")
  type                String    @default("service") // service | av_dpa | nda | sla …
  avDpa               Boolean   @default(false) @map("av_dpa") // AV/DPA (DSGVO Art. 28)
  securityClauses     Boolean   @default(false) @map("security_clauses")
  flowdown            Boolean   @default(false) // Weitergabe an Subunternehmer
  customerTransparency Boolean  @default(false) @map("customer_transparency")
  validFrom           DateTime? @map("valid_from")
  validTo             DateTime? @map("valid_to")
  reference           String?
  createdAt           DateTime  @default(now()) @map("created_at")

  supplier Supplier @relation(fields: [supplierId], references: [id], onDelete: Cascade)

  @@index([tenantId])
  @@map("contracts")
}

model Nda {
  id              String    @id @default(cuid())
  tenantId        String    @map("tenant_id")
  supplierId      String    @map("supplier_id")
  parties         String?
  infoScope       String?   @map("info_scope")
  subject         String?
  validFrom       DateTime? @map("valid_from")
  validTo         DateTime? @map("valid_to")
  obligations     String?
  extensionStatus String?   @map("extension_status") // z. B. offen | verlängert | ausgelaufen
  createdAt       DateTime  @default(now()) @map("created_at")

  supplier Supplier @relation(fields: [supplierId], references: [id], onDelete: Cascade)

  @@index([tenantId])
  @@map("ndas")
}

model SupplierEvidence {
  id              String       @id @default(cuid())
  tenantId        String       @map("tenant_id")
  supplierId      String       @map("supplier_id")
  kind            EvidenceKind
  name            String?
  protectsCia     String?      @map("protects_cia") // z. B. "C,I,A"
  validTo         DateTime?    @map("valid_to")
  adequacyChecked Boolean      @default(false) @map("adequacy_checked")
  createdAt       DateTime     @default(now()) @map("created_at")

  supplier Supplier @relation(fields: [supplierId], references: [id], onDelete: Cascade)

  @@index([tenantId])
  @@map("supplier_evidence")
}

model ServiceResponsibility {
  id                     String           @id @default(cuid())
  tenantId               String           @map("tenant_id")
  supplierId             String           @map("supplier_id")
  itService              String           @map("it_service")
  requirement            String
  responsibleParty       ResponsibleParty @default(SHARED) @map("responsible_party")
  isaApplicability       String?          @map("isa_applicability")
  evidence               String?
  integratedLocalControls String?         @map("integrated_local_controls")
  createdAt              DateTime         @default(now()) @map("created_at")

  supplier Supplier @relation(fields: [supplierId], references: [id], onDelete: Cascade)

  @@index([tenantId])
  @@map("service_responsibilities")
}

model Subcontractor {
  id                 String  @id @default(cuid())
  tenantId           String  @map("tenant_id")
  supplierId         String  @map("supplier_id")
  name               String
  flowdownObligation Boolean @default(false) @map("flowdown_obligation")

  supplier Supplier @relation(fields: [supplierId], references: [id], onDelete: Cascade)

  @@index([tenantId])
  @@map("subcontractors")
}

model ManagementDecision {
  id          String    @id @default(cuid())
  tenantId    String    @map("tenant_id")
  supplierId  String    @map("supplier_id")
  reasonNoAudit String  @map("reason_no_audit")
  decision    String
  decidedBy   String?   @map("decided_by")
  date        DateTime  @default(now())
  recordRef   String?   @map("record_ref")

  supplier Supplier @relation(fields: [supplierId], references: [id], onDelete: Cascade)

  @@index([tenantId])
  @@map("management_decisions")
}

// VDA-ISA 2027 Kapitel 6 — Supplier Relationships (globaler Katalog, per Import versioniert)
model SupplierControl {
  id        String @id @default(cuid())
  ref       String @unique // 6.1.1 / 6.1.2 / 6.1.3
  title     String
  objective String

  mustReq     String? @map("must_req")
  shouldReq   String? @map("should_req")
  highReq     String? @map("high_req")       // Additional for high protection
  veryHighReq String? @map("very_high_req")  // Additional for very high protection
  simplifiedGroupAssessment Boolean @default(false) @map("simplified_group_assessment")
  targetMaturity Int  @default(3) @map("target_maturity")
  references  String? // ISO 27001, NIST CSF, BSI …

  maturity SupplierControlMaturity[]

  @@map("supplier_controls")
}

model SupplierControlMaturity {
  id         String @id @default(cuid())
  tenantId   String @map("tenant_id")
  supplierId String @map("supplier_id")
  controlId  String @map("control_id")
  maturity   Int    @default(0) // 0–5
  notes      String?

  supplier Supplier        @relation(fields: [supplierId], references: [id], onDelete: Cascade)
  control  SupplierControl @relation(fields: [controlId], references: [id], onDelete: Cascade)

  @@unique([supplierId, controlId])
  @@index([tenantId])
  @@map("supplier_control_maturity")
}

model AuditLog {
  id        String   @id @default(cuid())
  tenantId  String   @map("tenant_id")
  actorId   String?  @map("actor_id")
  action    String // create | update | delete | login | export | …
  entity    String // z. B. asset, risk, user
  entityId  String?  @map("entity_id")
  before    Json?
  after     Json?
  createdAt DateTime @default(now()) @map("created_at")

  tenant Tenant @relation(fields: [tenantId], references: [id])

  @@index([tenantId, entity, entityId])
  @@index([tenantId, createdAt])
  @@map("audit_logs")
}