model AiGeneratedMessage {
  id        String   @id @default(cuid())
  vehicleId String
  type      String // "summary" | "common_issues" | etc.
  content   String
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  vehicle Vehicle @relation(fields: [vehicleId], references: [id], onDelete: Cascade)

  @@unique([vehicleId, type])
  @@map("ai_generated_messages")
}

/// A conversation about one vehicle or one customer. The chat is scoped to
/// that record on purpose: the model is handed the record's own data and
/// nothing else, so it can only ever talk about what the page it was opened
/// from already shows. Exactly one of vehicleId and customerId is set.
model AiChat {
  id        String   @id @default(cuid())
  title     String   @default("New chat")
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  userId         String
  organizationId String

  vehicleId String?
  vehicle   Vehicle? @relation(fields: [vehicleId], references: [id], onDelete: Cascade)

  customerId String?
  customer   Customer? @relation(fields: [customerId], references: [id], onDelete: Cascade)

  messages AiChatMessage[]

  @@index([organizationId, userId, updatedAt(sort: Desc)])
  @@index([vehicleId])
  @@index([customerId])
  @@map("ai_chats")
}

model AiChatMessage {
  id        String   @id @default(cuid())
  role      String // "user" | "assistant"
  content   String
  createdAt DateTime @default(now())

  chatId String
  chat   AiChat @relation(fields: [chatId], references: [id], onDelete: Cascade)

  @@index([chatId, createdAt])
  @@map("ai_chat_messages")
}