generator client {
  provider = "prisma-client-js"
}

datasource db {
  provider = "postgresql"
}

enum MessageDirection {
  ELDER_TO_FAMILY
  FAMILY_TO_ELDER
}

enum MessageImportance {
  LOW
  NORMAL
  HIGH
  URGENT
}

enum MessageStatus {
  PENDING
  DELIVERED
  READ
}

enum ConversationRole {
  USER
  ASSISTANT
  TOOL
}

enum UsageEventType {
  APP_OPEN
  SETTINGS_OPENED
  AI_SESSION_STARTED
  AI_SESSION_ENDED
  CAMERA_ENABLED
  CAMERA_DISABLED
  TOOL_CALLED
}

enum ToolCallStatus {
  SUCCESS
  FAILURE
}

model CaregiverAccount {
  id                String             @id @default(cuid())
  username          String?            @unique
  passwordHash      String?
  nickname          String?
  createdAt         DateTime           @default(now())
  updatedAt         DateTime           @updatedAt
  sessions          CaregiverSession[]
  bindings          DeviceBinding[]
  messages          FamilyMessage[]
  pushSubscriptions PushSubscription[]
}

model CaregiverSession {
  id           String           @id @default(cuid())
  caregiverId  String
  sessionToken String           @unique
  userAgent    String?
  lastSeenAt   DateTime?
  createdAt    DateTime         @default(now())
  updatedAt    DateTime         @updatedAt
  caregiver    CaregiverAccount @relation(fields: [caregiverId], references: [id], onDelete: Cascade)

  @@index([caregiverId, updatedAt(sort: Desc)])
}

model ElderDevice {
  id                String             @id @default(cuid())
  deviceUuid        String             @unique
  displayName       String?
  appVersion        String?
  lastSeenAt        DateTime?
  createdAt         DateTime           @default(now())
  updatedAt         DateTime           @updatedAt
  bindings          DeviceBinding[]
  messages          FamilyMessage[]
  conversationTurns ConversationTurn[]
  usageEvents       UsageEvent[]
  toolCalls         ToolCallLog[]
}

model DeviceBinding {
  id            String           @id @default(cuid())
  caregiverId   String
  elderDeviceId String
  alias         String?
  createdAt     DateTime         @default(now())
  caregiver     CaregiverAccount @relation(fields: [caregiverId], references: [id], onDelete: Cascade)
  elderDevice   ElderDevice      @relation(fields: [elderDeviceId], references: [id], onDelete: Cascade)

  @@unique([caregiverId, elderDeviceId])
  @@index([elderDeviceId, createdAt])
}

model FamilyMessage {
  id                String            @id @default(cuid())
  publicId          Int               @unique @default(autoincrement())
  elderDeviceId     String
  caregiverId       String?
  direction         MessageDirection
  content           String
  recipientRelation String?
  importance        MessageImportance @default(NORMAL)
  status            MessageStatus     @default(PENDING)
  source            String?
  createdAt         DateTime          @default(now())
  deliveredAt       DateTime?
  readAt            DateTime?
  elderDevice       ElderDevice       @relation(fields: [elderDeviceId], references: [id], onDelete: Cascade)
  caregiver         CaregiverAccount? @relation(fields: [caregiverId], references: [id], onDelete: SetNull)

  @@index([elderDeviceId, createdAt(sort: Desc)])
  @@index([direction, status, createdAt(sort: Desc)])
}

model PushSubscription {
  id             String           @id @default(cuid())
  caregiverId    String
  endpoint       String           @unique
  p256dh         String
  auth           String
  expirationTime DateTime?
  userAgent      String?
  createdAt      DateTime         @default(now())
  updatedAt      DateTime         @updatedAt
  caregiver      CaregiverAccount @relation(fields: [caregiverId], references: [id], onDelete: Cascade)

  @@index([caregiverId, updatedAt(sort: Desc)])
}

model ConversationTurn {
  id            String           @id @default(cuid())
  elderDeviceId String
  sessionId     String?
  role          ConversationRole
  content       String
  metaJson      String?
  createdAt     DateTime         @default(now())
  elderDevice   ElderDevice      @relation(fields: [elderDeviceId], references: [id], onDelete: Cascade)

  @@index([elderDeviceId, createdAt(sort: Desc)])
  @@index([sessionId, createdAt])
}

model UsageEvent {
  id            String         @id @default(cuid())
  elderDeviceId String
  eventType     UsageEventType
  detailJson    String?
  createdAt     DateTime       @default(now())
  elderDevice   ElderDevice    @relation(fields: [elderDeviceId], references: [id], onDelete: Cascade)

  @@index([elderDeviceId, createdAt(sort: Desc)])
  @@index([eventType, createdAt(sort: Desc)])
}

model ToolCallLog {
  id            String         @id @default(cuid())
  elderDeviceId String
  sessionId     String?
  callId        String?
  toolName      String
  argumentsJson String
  outputText    String?
  status        ToolCallStatus
  createdAt     DateTime       @default(now())
  elderDevice   ElderDevice    @relation(fields: [elderDeviceId], references: [id], onDelete: Cascade)

  @@index([elderDeviceId, createdAt(sort: Desc)])
  @@index([toolName, createdAt(sort: Desc)])
}