// 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[]

  @@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")
}

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")
}