// ============================================================
// LiveServer-M1 — Database Schema
// Educational video conferencing platform on LiveKit
// ============================================================

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

datasource db {
  provider = "postgresql"
}

// ======================== ENUMS =============================

enum UserRole {
  ADMIN
  HOST
  GUEST
}

enum RoomStatus {
  WAITING // Создана, но лекция не началась
  ACTIVE  // Лекция идёт
  ENDED   // Лекция завершена
}

enum LobbyStatus {
  PENDING
  APPROVED
  REJECTED
}

// ======================== AUTH ==============================
// Таблицы совместимы с better-auth (Prisma adapter)
// Docs: https://www.better-auth.com/docs/adapters/prisma

model User {
  id            String    @id @default(cuid())
  email         String    @unique
  name          String
  emailVerified Boolean   @default(false)
  image         String?
  role          UserRole  @default(HOST)
  createdAt     DateTime  @default(now())
  updatedAt     DateTime  @updatedAt

  // better-auth relations
  sessions Session[]
  accounts Account[]

  // App relations
  hostedRooms          Room[]               @relation("RoomHost")
  participantHistories ParticipantHistory[]
  bannedByEntries      BannedEntry[]        @relation("BannedBy")

  @@map("users")
}

model Session {
  id        String   @id @default(cuid())
  userId    String
  token     String   @unique
  expiresAt DateTime
  ipAddress String?
  userAgent String?
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

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

  @@index([userId])
  @@map("sessions")
}

model Account {
  id                    String    @id @default(cuid())
  userId                String
  accountId             String
  providerId            String
  accessToken           String?
  refreshToken          String?
  accessTokenExpiresAt  DateTime?
  refreshTokenExpiresAt DateTime?
  scope                 String?
  idToken               String?
  password              String?
  createdAt             DateTime  @default(now())
  updatedAt             DateTime  @updatedAt

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

  @@index([userId])
  @@map("accounts")
}

model Verification {
  id         String   @id @default(cuid())
  identifier String
  value      String
  expiresAt  DateTime
  createdAt  DateTime @default(now())
  updatedAt  DateTime @updatedAt

  @@map("verifications")
}

// ======================== ROOMS =============================

model Room {
  id           String     @id @default(cuid())
  name         String
  code         String     @unique @default(cuid()) // Короткий код для инвайт-ссылки
  hostId       String
  status       RoomStatus @default(WAITING)

  // Security settings
  lobbyEnabled Boolean @default(true)
  pinHash      String? // bcrypt hash, null = без PIN
  webinarMode  Boolean @default(false)
  isLocked     Boolean @default(false) // Хост может заблокировать вход полностью

  // LiveKit
  livekitRoomName String? @unique // Имя комнаты в LiveKit (создаётся при старте)

  // Timestamps
  createdAt DateTime  @default(now())
  startedAt DateTime? // Когда хост начал лекцию
  endedAt   DateTime? // Когда завершилась

  // Relations
  host                 User                 @relation("RoomHost", fields: [hostId], references: [id])
  lobbyEntries         LobbyEntry[]
  participantHistories ParticipantHistory[]
  chatMessages         ChatMessage[]
  sharedFiles          SharedFile[]
  bannedEntries        BannedEntry[]
  lectureArtifact      LectureArtifact?

  @@index([hostId])
  @@index([status])
  @@index([code])
  @@map("rooms")
}

// ======================== LOBBY =============================

model LobbyEntry {
  id                 String      @id @default(cuid())
  roomId             String
  displayName        String
  sessionId          String      // UUID, генерируется на клиенте
  sessionFingerprint String?     // Browser fingerprint hash
  ipAddress          String?
  status             LobbyStatus @default(PENDING)
  createdAt          DateTime    @default(now())
  updatedAt          DateTime    @updatedAt

  room Room @relation(fields: [roomId], references: [id], onDelete: Cascade)

  @@index([roomId, status])
  @@index([sessionId])
  @@map("lobby_entries")
}

// ======================== PARTICIPANTS ======================

model ParticipantHistory {
  id          String   @id @default(cuid())
  roomId      String
  userId      String?  // null для гостей без аккаунта
  sessionId   String   // UUID, совпадает с LobbyEntry.sessionId
  displayName String
  role        UserRole
  joinedAt    DateTime @default(now())
  leftAt      DateTime?

  room Room  @relation(fields: [roomId], references: [id], onDelete: Cascade)
  user User? @relation(fields: [userId], references: [id], onDelete: SetNull)

  @@index([roomId])
  @@index([userId])
  @@index([sessionId])
  @@map("participant_histories")
}

// ======================== CHAT ==============================

model ChatMessage {
  id         String   @id @default(cuid())
  roomId     String
  sessionId  String   // Кто отправил (связь через sessionId, не userId — гости тоже пишут)
  senderName String
  content    String
  createdAt  DateTime @default(now())

  room Room @relation(fields: [roomId], references: [id], onDelete: Cascade)

  @@index([roomId, createdAt])
  @@map("chat_messages")
}

// ======================== FILES =============================

model SharedFile {
  id        String   @id @default(cuid())
  roomId    String
  sessionId String   // Кто загрузил
  fileName  String
  fileKey   String   // S3 object key
  fileSize  Int
  mimeType  String
  createdAt DateTime @default(now())

  room Room @relation(fields: [roomId], references: [id], onDelete: Cascade)

  @@index([roomId])
  @@map("shared_files")
}

// ======================== BANS ==============================

model BannedEntry {
  id                 String   @id @default(cuid())
  roomId             String
  sessionFingerprint String   // Основной идентификатор для бана
  ipAddress          String?  // Вторичный сигнал
  displayName        String?  // Для UI — кого забанили
  reason             String?
  bannedById         String   // Хост, который забанил
  createdAt          DateTime @default(now())

  room     Room @relation(fields: [roomId], references: [id], onDelete: Cascade)
  bannedBy User @relation("BannedBy", fields: [bannedById], references: [id])

  @@unique([roomId, sessionFingerprint])
  @@index([roomId])
  @@map("banned_entries")
}

// ======================== LECTURE ARTIFACTS ==================

model LectureArtifact {
  id             String   @id @default(cuid())
  roomId         String   @unique // 1:1 с Room
  transcriptText String?  @db.Text // Полный текст транскрипта (для поиска)
  transcriptUrl  String?  // S3 key для raw-файла транскрипта
  summary        String?  @db.Text // AI-сгенерированная суммаризация (Markdown/JSON)
  createdAt      DateTime @default(now())
  updatedAt      DateTime @updatedAt

  room Room @relation(fields: [roomId], references: [id], onDelete: Cascade)

  @@map("lecture_artifacts")
}