// Prisma Schema

generator client {
  provider               = "prisma-client"
  output                 = "../generated/prisma"
  engineType             = "client"
  generatedFileExtension = "ts"
  importFileExtension    = "ts"
  moduleFormat           = "esm"
  runtime                = "nodejs"
}

datasource db {
  provider = "postgresql"
}

model User {
  nwkennung    String   @id
  email        String?  @unique
  arbeitsname  String?
  firstName    String?
  lastName     String?
  passwordHash String?
  groupId      String?
  createdAt    DateTime @default(now())
  updatedAt    DateTime @updatedAt
  avatarUrl    String?

  devicesCreated Device[]        @relation("DeviceCreatedBy")
  devicesUpdated Device[]        @relation("DeviceUpdatedBy")
  historyEntries DeviceHistory[] @relation("DeviceHistoryChangedBy")

  // UserGroup hat ein Feld "id" – also darauf referenzieren
  group UserGroup? @relation(fields: [groupId], references: [id])

  roles UserRole[]

  @@index([groupId])
}

model Role {
  id    String     @id @default(uuid())
  name  String     @unique
  users UserRole[]
}

model UserRole {
  userId     String
  roleId     String
  assignedAt DateTime @default(now())

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

  @@id([userId, roleId])
}

model UserGroup {
  id    String @id @default(uuid())
  name  String @unique
  users User[]
  canEditDevices Boolean @default(false)
}

model DeviceGroup {
  id      String   @id @default(uuid())
  name    String   @unique
  devices Device[]
}

model Location {
  id      String   @id @default(uuid())
  name    String   @unique
  devices Device[]
}

model Device {
  inventoryNumber String    @id
  name            String
  manufacturer    String
  model           String
  serialNumber    String?
  productNumber   String?
  comment         String?
  ipv4Address     String?   @unique
  ipv6Address     String?   @unique
  macAddress      String?   @unique
  username        String?   @unique
  passwordHash    String?   @unique
  groupId         String?
  locationId      String?
  loanedTo        String?
  loanedFrom      DateTime?
  loanedUntil     DateTime?
  loanComment     String?
  createdAt       DateTime  @default(now())
  updatedAt       DateTime  @updatedAt
  createdById     String?
  updatedById     String?

  // 🔹 Self-Relation Hauptgerät/Zubehör
  parentDeviceId String?
  parentDevice   Device?  @relation(name: "DeviceAccessories", fields: [parentDeviceId], references: [inventoryNumber], onDelete: SetNull)
  accessories    Device[] @relation("DeviceAccessories")

  createdBy User? @relation("DeviceCreatedBy", fields: [createdById], references: [nwkennung])
  updatedBy User? @relation("DeviceUpdatedBy", fields: [updatedById], references: [nwkennung])

  group    DeviceGroup? @relation(fields: [groupId], references: [id])
  location Location?    @relation(fields: [locationId], references: [id])

  history DeviceHistory[]
  tags    Tag[]           @relation("DeviceToTag")

  @@index([inventoryNumber])
  @@index([groupId])
  @@index([locationId])
  @@index([parentDeviceId])
}

model Tag {
  id      String   @id @default(uuid())
  name    String   @unique
  devices Device[] @relation("DeviceToTag")
}

model DeviceHistory {
  id          String           @id @default(uuid())
  deviceId    String?
  changeType  DeviceChangeType
  snapshot    Json
  changedAt   DateTime         @default(now())
  changedById String?

  changedBy User?   @relation("DeviceHistoryChangedBy", fields: [changedById], references: [nwkennung])
  device    Device? @relation(fields: [deviceId], references: [inventoryNumber], onDelete: SetNull)
}

enum DeviceChangeType {
  CREATED
  UPDATED
  DELETED
}