// 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")

  @@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[]

  @@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
  residualLikelihood Int? @map("residual_likelihood")
  residualImpact     Int? @map("residual_impact")
  residualScore      Int? @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[]

  @@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")
}

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")
}