// Novya backend schema.
// Identity/auth from Phase 3 is preserved. Domain tables match BACKEND_DATABASE_ARCHITECTURE_AUDIT.md.

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

datasource db {
  provider = "mysql"
  url      = env("DATABASE_URL")
}

enum AuthProvider {
  password
  guest
}

enum AttemptPhase {
  pre
  post
}

enum AttemptStatus {
  /// Reserved for future draft/in-progress attempts; MVP always writes `scored`.
  submitted
  scored
}

enum SessionProgressStatus {
  not_started
  in_progress
  completed
}

enum ChatRole {
  /// Used in coach prompts at runtime; not persisted to chat_messages.
  system
  user
  assistant
}

enum AiRunStatus {
  queued
  running
  succeeded
  failed
}

model User {
  id         BigInt   @id @default(autoincrement()) @db.UnsignedBigInt
  externalId String   @unique @default(uuid()) @db.Char(36)
  isGuest    Boolean  @default(false)
  createdAt  DateTime @default(now())
  updatedAt  DateTime @updatedAt

  profile             UserProfile?
  identities          AuthIdentity[]
  sessions            AuthSession[]
  journey             LearningJourney?
  assessmentAttempts  AssessmentAttempt[]
  sessionProgress     SessionProgress[]
  chatSessions        ChatSession[]
  aiRuns              AiAnalysisRun[]

  @@index([createdAt], map: "idx_users_created_at")
  @@index([isGuest], map: "idx_users_is_guest")
  @@map("users")
}

model UserProfile {
  userId    BigInt   @id @db.UnsignedBigInt
  name      String   @db.VarChar(100)
  age       Int
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

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

  @@index([name], map: "idx_user_profiles_name")
  @@map("user_profiles")
}

model AuthIdentity {
  id              BigInt       @id @default(autoincrement()) @db.UnsignedBigInt
  userId          BigInt       @db.UnsignedBigInt
  provider        AuthProvider
  providerSubject String       @db.VarChar(191)
  email           String?      @db.VarChar(191)
  passwordHash    String?      @db.VarChar(255)
  createdAt       DateTime     @default(now())
  updatedAt       DateTime     @updatedAt

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

  @@unique([provider, providerSubject], map: "uq_auth_identities_provider_subject")
  @@index([userId], map: "idx_auth_identities_user_id")
  @@index([email], map: "idx_auth_identities_email")
  @@map("auth_identities")
}

model AuthSession {
  id        BigInt    @id @default(autoincrement()) @db.UnsignedBigInt
  userId    BigInt    @db.UnsignedBigInt
  tokenHash String    @unique @db.Char(64)
  expiresAt DateTime
  revokedAt DateTime?
  createdAt DateTime  @default(now())
  updatedAt DateTime  @updatedAt

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

  @@index([userId, expiresAt], map: "idx_auth_sessions_user_id_expires_at")
  @@index([expiresAt], map: "idx_auth_sessions_expires_at")
  @@map("auth_sessions")
}

/// Timestamps are authoritative. currentStep is a denormalized cache.
model LearningJourney {
  userId               BigInt    @id @db.UnsignedBigInt
  currentStep          String    @default("registered") @db.VarChar(32)
  preTestCompletedAt   DateTime?
  trainingStartedAt    DateTime?
  trainingCompletedAt  DateTime?
  postTestCompletedAt  DateTime?
  lastActivityAt       DateTime  @default(now())
  createdAt            DateTime  @default(now())
  updatedAt            DateTime  @updatedAt

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

  @@map("learning_journeys")
}

/// Catalog of the 11 educational sessions. Content blocks are JSON (same shape as PWA).
model CourseSession {
  id                       BigInt @id @default(autoincrement()) @db.UnsignedBigInt
  sessionKey               String @unique @db.VarChar(64)
  order                    Int    @unique
  title                    String @db.VarChar(191)
  description              String @db.Text
  estimatedDurationMinutes Int
  blocks                   Json
  createdAt                DateTime @default(now())
  updatedAt                DateTime @updatedAt

  sessionProgress SessionProgress[]
  chatSessions    ChatSession[]

  @@index([order], map: "idx_course_sessions_order")
  @@map("course_sessions")
}

model SessionProgress {
  id                  BigInt                 @id @default(autoincrement()) @db.UnsignedBigInt
  userId              BigInt                 @db.UnsignedBigInt
  sessionOrder        Int
  status              SessionProgressStatus  @default(not_started)
  startedAt           DateTime?
  completedAt         DateTime?
  completionMetadata  Json?
  createdAt           DateTime               @default(now())
  updatedAt           DateTime               @updatedAt

  user          User          @relation(fields: [userId], references: [id], onDelete: Cascade)
  courseSession CourseSession @relation(fields: [sessionOrder], references: [order], onDelete: Restrict, onUpdate: Cascade)

  @@unique([userId, sessionOrder], map: "uq_session_progress_user_order")
  @@index([userId, status], map: "idx_session_progress_user_status")
  @@map("session_progress")
}

model AssessmentAttempt {
  id          BigInt         @id @default(autoincrement()) @db.UnsignedBigInt
  userId      BigInt         @db.UnsignedBigInt
  phase       AttemptPhase
  status      AttemptStatus  @default(scored)
  submittedAt DateTime
  scoredAt    DateTime
  createdAt   DateTime       @default(now())
  updatedAt   DateTime       @updatedAt

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

  @@unique([userId, phase], map: "uq_assessment_attempts_user_phase")
  @@index([userId, phase, submittedAt], map: "idx_assessment_attempts_user_phase_submitted")
  @@map("assessment_attempts")
}

model AssessmentAnswer {
  id              BigInt @id @default(autoincrement()) @db.UnsignedBigInt
  attemptId       BigInt @db.UnsignedBigInt
  questionId      String @db.VarChar(32)
  rawValue        Int
  points          Int
  dimension       String @db.VarChar(32)
  isReverseScored Boolean
  createdAt       DateTime @default(now())

  attempt AssessmentAttempt @relation(fields: [attemptId], references: [id], onDelete: Cascade)

  @@unique([attemptId, questionId], map: "uq_assessment_answers_attempt_question")
  @@map("assessment_answers")
}

model AssessmentScore {
  id        BigInt  @id @default(autoincrement()) @db.UnsignedBigInt
  attemptId BigInt  @db.UnsignedBigInt
  metricKey String  @db.VarChar(32)
  rawScore  Int
  createdAt DateTime @default(now())

  attempt AssessmentAttempt @relation(fields: [attemptId], references: [id], onDelete: Cascade)

  @@unique([attemptId, metricKey], map: "uq_assessment_scores_attempt_metric")
  @@map("assessment_scores")
}

model ChatSession {
  id           BigInt    @id @default(autoincrement()) @db.UnsignedBigInt
  userId       BigInt    @db.UnsignedBigInt
  sessionOrder Int
  startedAt    DateTime  @default(now())
  endedAt      DateTime?
  createdAt    DateTime  @default(now())
  updatedAt    DateTime  @updatedAt

  user          User          @relation(fields: [userId], references: [id], onDelete: Cascade)
  courseSession CourseSession @relation(fields: [sessionOrder], references: [order], onDelete: Restrict, onUpdate: Cascade)
  messages      ChatMessage[]
  aiRuns        AiAnalysisRun[]

  @@index([userId, sessionOrder, startedAt], map: "idx_chat_sessions_user_order_started")
  @@map("chat_sessions")
}

model ChatMessage {
  id            BigInt   @id @default(autoincrement()) @db.UnsignedBigInt
  chatSessionId BigInt   @db.UnsignedBigInt
  role          ChatRole
  content       String   @db.Text
  metadata      Json?
  createdAt     DateTime @default(now())

  chatSession ChatSession @relation(fields: [chatSessionId], references: [id], onDelete: Cascade)

  @@index([chatSessionId, createdAt], map: "idx_chat_messages_session_created")
  @@map("chat_messages")
}

model AiAnalysisRun {
  id            BigInt      @id @default(autoincrement()) @db.UnsignedBigInt
  userId        BigInt      @db.UnsignedBigInt
  chatSessionId BigInt?
  provider      String      @db.VarChar(64)
  model         String      @db.VarChar(128)
  status        AiRunStatus @default(queued)
  latencyMs     Int?
  totalTokens   Int?
  errorMessage  String?     @db.Text
  createdAt     DateTime    @default(now())
  updatedAt     DateTime    @updatedAt

  user        User         @relation(fields: [userId], references: [id], onDelete: Cascade)
  chatSession ChatSession? @relation(fields: [chatSessionId], references: [id], onDelete: SetNull)

  @@index([userId, createdAt], map: "idx_ai_analysis_runs_user_created")
  @@map("ai_analysis_runs")
}