model Customer {
  id             String   @id @default(cuid())
  /// Human-facing customer number: auto-assigned sequentially on create,
  /// editable afterwards. Unique per organization (nulls allowed for
  /// legacy customers).
  customerNumber String?
  name           String
  email          String?
  phone          String?
  address        String?
  company        String?
  taxId          String?
  taxExempt      Boolean  @default(false)
  /// Asked not to receive reminders and campaigns. Honoured by every outreach flow.
  reminderOptOut Boolean  @default(false)
  notes          String?
  telegramChatId String?
  createdAt      DateTime @default(now())
  updatedAt      DateTime @updatedAt

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

  organizationId String?
  organization   Organization? @relation(fields: [organizationId], references: [id], onDelete: Cascade)

  vehicles            Vehicle[]
  quotes              Quote[]
  smsMessages         SmsMessage[]
  telegramMessages    TelegramMessage[]
  whatsappMessages    WhatsappMessage[]
  customerSessions    CustomerSession[]
  scheduledMessages   ScheduledMessage[]
  serviceRequests     ServiceRequest[]
  inspectionReminders InspectionReminderSend[]

  serviceRecords ServiceRecord[]
  reminders      Reminder[]
  tireSets       TireSet[]

  /// The invoice design this customer's invoices use in place of the
  /// workshop's default: a fleet account that wants its own paper. An
  /// invoice's own choice wins over it. SetNull: a deleted design falls
  /// back to the default.
  invoiceDesignId String?
  invoiceDesign   DocumentDesign? @relation(fields: [invoiceDesignId], references: [id], onDelete: SetNull)

  importBatchId String?
  importBatch   ImportBatch? @relation(fields: [importBatchId], references: [id], onDelete: SetNull)

  @@unique([organizationId, customerNumber])
  @@index([organizationId])
  @@index([importBatchId])
  @@index([invoiceDesignId])
  @@map("customers")
}

model CustomerSession {
  id        String   @id @default(cuid())
  token     String   @unique
  expiresAt DateTime
  createdAt DateTime @default(now())

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

  @@index([token])
  @@index([customerId, organizationId])
  @@map("customer_sessions")
}

model CustomerMagicLink {
  id             String    @id @default(cuid())
  token          String    @unique
  email          String
  organizationId String
  expiresAt      DateTime
  usedAt         DateTime?
  createdAt      DateTime  @default(now())

  @@index([token])
  @@map("customer_magic_links")
}

model CustomerSmsCode {
  id String @id @default(cuid())

  /// SHA-256 of the digits, not the digits.
  ///
  /// The code reaches the customer in a text message and lives in their head
  /// for a minute. It has no business also sitting in a table where reading a
  /// row hands over somebody's portal session.
  code String

  /// Wrong guesses so far. Six digits is a million, which sounds like plenty
  /// and is not: limiting by address does nothing about a hundred machines
  /// sharing the work. Five attempts against one code makes the space
  /// irrelevant, because the code is gone long before the guessing arrives.
  attempts Int @default(0)

  phone          String
  organizationId String
  expiresAt      DateTime
  usedAt         DateTime?
  createdAt      DateTime  @default(now())

  @@index([phone, organizationId])
  @@index([organizationId])
  @@map("customer_sms_codes")
}

model ServiceRequest {
  id            String    @id @default(cuid())
  description   String
  preferredDate DateTime?
  status        String    @default("pending")
  adminNotes    String?
  createdAt     DateTime  @default(now())
  updatedAt     DateTime  @updatedAt

  customerId     String
  customer       Customer @relation(fields: [customerId], references: [id], onDelete: Cascade)
  vehicleId      String
  vehicle        Vehicle  @relation(fields: [vehicleId], references: [id], onDelete: Cascade)
  organizationId String

  @@index([organizationId, status])
  @@index([customerId])
  @@map("service_requests")
}