generator client {
  provider      = "prisma-client-js"
  binaryTargets = ["native", "linux-musl-openssl-3.0.x"]
}

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

model User {
  id                   BigInt    @id @default(autoincrement())
  email                String?   @db.VarChar(255)
  nickname             String?   @db.VarChar(100)
  avatarUrl            String?   @db.VarChar(500)
  status               String    @default("active") @db.VarChar(32)
  onboardingCompleted  Boolean   @default(false)
  lastLoginAt          DateTime?
  createdAt            DateTime  @default(now())
  updatedAt            DateTime  @updatedAt
  deletedAt            DateTime?

  authAccounts         AuthAccount[]
  refreshTokens        RefreshToken[]
  profile              UserProfile?
  preferences          UserPreference?
  consents             UserConsent[]
  knowledgeBases       KnowledgeBase[]
  knowledgeItems       KnowledgeItem[]
  knowledgeItemRelations KnowledgeItemRelation[]
  tags                 Tag[]
  uploadedFiles        UploadedFile[]
  documentImports      DocumentImport[]
  learningSessions     LearningSession[]
  learningRecords      LearningRecord[]
  activeRecallQuestions ActiveRecallQuestion[]
  activeRecallAnswers  ActiveRecallAnswer[]
  aiAnalysisJobs       AiAnalysisJob[]
  aiAnalysisResults    AiAnalysisResult[]
  focusItems           FocusItem[]
  reviewCards          ReviewCard[]
  reviewLogs           ReviewLog[]
  reviewPlans          ReviewPlan[]
  dailyLearningActivities DailyLearningActivity[]
  notifications        Notification[]
  feedbacks            Feedback[]

  @@index([email])
  @@index([status])
}

model AuthAccount {
  id              BigInt    @id @default(autoincrement())
  userId          BigInt
  provider        String    @db.VarChar(32)
  providerUserId  String    @db.VarChar(255)
  email           String?   @db.VarChar(255)
  rawProfileJson  Json?
  createdAt       DateTime  @default(now())
  updatedAt       DateTime  @updatedAt

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

  @@unique([provider, providerUserId])
  @@index([userId])
}

model RefreshToken {
  id         BigInt    @id @default(autoincrement())
  userId     BigInt
  tokenHash  String    @db.VarChar(255)
  deviceId   String?   @db.VarChar(255)
  deviceName String?   @db.VarChar(255)
  expiresAt  DateTime
  revokedAt  DateTime?
  createdAt  DateTime  @default(now())
  updatedAt  DateTime  @updatedAt

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

  @@index([userId])
  @@index([tokenHash])
}

model UserProfile {
  id                BigInt    @id @default(autoincrement())
  userId            BigInt    @unique
  learningIdentity  String?   @db.VarChar(100)
  learningDirection String?   @db.VarChar(255)
  bio               String?   @db.Text
  currentGoal       String?   @db.VarChar(255)
  createdAt         DateTime  @default(now())
  updatedAt         DateTime  @updatedAt

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

model UserPreference {
  id                  BigInt    @id @default(autoincrement())
  userId              BigInt    @unique
  preferredMethods    Json?
  defaultFocusMinutes Int       @default(25)
  aiSuggestionLevel   String    @default("normal") @db.VarChar(32)
  language            String    @default("zh-CN") @db.VarChar(32)
  appearance          String    @default("system") @db.VarChar(32)
  notificationEnabled Boolean   @default(true)
  createdAt           DateTime  @default(now())
  updatedAt           DateTime  @updatedAt

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

model UserConsent {
  id          BigInt    @id @default(autoincrement())
  userId      BigInt
  consentType String    @db.VarChar(32)
  version     String    @db.VarChar(50)
  acceptedAt  DateTime
  ipAddress   String?   @db.VarChar(100)
  userAgent   String?   @db.VarChar(500)
  createdAt   DateTime  @default(now())

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

  @@index([userId])
  @@index([consentType])
}

model KnowledgeBase {
  id            BigInt    @id @default(autoincrement())
  userId        BigInt
  title         String    @db.VarChar(255)
  description   String?   @db.Text
  coverKey      String?   @db.VarChar(100)
  status        String    @default("active") @db.VarChar(32)
  itemCount     Int       @default(0)
  lastStudiedAt DateTime?
  createdAt     DateTime  @default(now())
  updatedAt     DateTime  @updatedAt
  deletedAt     DateTime?

  user          User              @relation(fields: [userId], references: [id])
  items         KnowledgeItem[]
  focusItems    FocusItem[]

  @@index([userId])
  @@index([status])
}

model KnowledgeItem {
  id              BigInt    @id @default(autoincrement())
  userId          BigInt
  knowledgeBaseId BigInt
  parentId        BigInt?
  itemType        String    @db.VarChar(32)
  title           String    @db.VarChar(255)
  content         String?   @db.LongText
  summary         String?   @db.Text
  sourceType      String?   @db.VarChar(32)
  sourceRef       String?   @db.VarChar(500)
  orderIndex      Int       @default(0)
  status          String    @default("active") @db.VarChar(32)
  createdAt       DateTime  @default(now())
  updatedAt       DateTime  @updatedAt
  deletedAt       DateTime?

  user            User              @relation(fields: [userId], references: [id])
  knowledgeBase   KnowledgeBase     @relation(fields: [knowledgeBaseId], references: [id])
  parent          KnowledgeItem?    @relation("KnowledgeItemRelations", fields: [parentId], references: [id])
  children        KnowledgeItem[]   @relation("KnowledgeItemRelations")
  tags            KnowledgeItemTag[]

  @@index([userId])
  @@index([knowledgeBaseId])
  @@index([parentId])
  @@index([itemType])
}

model KnowledgeItemRelation {
  id            BigInt    @id @default(autoincrement())
  userId        BigInt
  sourceItemId  BigInt
  targetItemId  BigInt
  relationType  String    @db.VarChar(32)
  confidence    Decimal?  @db.Decimal(5, 2)
  reason        String?   @db.Text
  createdAt     DateTime  @default(now())
  updatedAt     DateTime  @updatedAt

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

  @@index([sourceItemId])
  @@index([targetItemId])
}

model Tag {
  id        BigInt              @id @default(autoincrement())
  userId    BigInt
  name      String              @db.VarChar(100)
  color     String?             @db.VarChar(32)
  createdAt DateTime            @default(now())
  updatedAt DateTime            @updatedAt

  user      User                @relation(fields: [userId], references: [id])
  items     KnowledgeItemTag[]

  @@unique([userId, name])
}

model KnowledgeItemTag {
  id              BigInt        @id @default(autoincrement())
  knowledgeItemId BigInt
  tagId           BigInt
  createdAt       DateTime      @default(now())

  knowledgeItem   KnowledgeItem @relation(fields: [knowledgeItemId], references: [id])
  tag             Tag           @relation(fields: [tagId], references: [id])

  @@unique([knowledgeItemId, tagId])
}

model UploadedFile {
  id          BigInt    @id @default(autoincrement())
  userId      BigInt
  filename    String    @db.VarChar(255)
  mimeType    String?   @db.VarChar(100)
  storagePath String    @db.VarChar(500)
  sizeBytes   BigInt    @default(0)
  checksum    String?   @db.VarChar(255)
  createdAt   DateTime  @default(now())

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

  @@index([userId])
}

model DocumentImport {
  id              BigInt    @id @default(autoincrement())
  userId          BigInt
  knowledgeBaseId BigInt?
  fileId          BigInt?
  sourceType      String    @db.VarChar(32)
  sourceName      String?   @db.VarChar(255)
  sourceUrl       String?   @db.VarChar(500)
  rawText         String?   @db.LongText
  status          String    @default("pending") @db.VarChar(32)
  progress        Int       @default(0)
  errorMessage    String?   @db.Text
  resultJson      Json?
  startedAt       DateTime?
  completedAt     DateTime?
  createdAt       DateTime  @default(now())
  updatedAt       DateTime  @updatedAt

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

  @@index([userId])
  @@index([status])
}

model LearningSession {
  id                BigInt    @id @default(autoincrement())
  userId            BigInt
  knowledgeBaseId   BigInt?
  knowledgeItemId   BigInt?
  mode              String    @db.VarChar(32)
  status            String    @default("active") @db.VarChar(32)
  startedAt         DateTime
  endedAt           DateTime?
  durationSeconds   Int       @default(0)
  focusMinutes      Int?
  metadata          Json?
  createdAt         DateTime  @default(now())
  updatedAt         DateTime  @updatedAt

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

  @@index([userId])
  @@index([knowledgeItemId])
  @@index([startedAt])
}

model LearningRecord {
  id              BigInt    @id @default(autoincrement())
  userId          BigInt
  sessionId       BigInt?
  recordType      String    @db.VarChar(32)
  title           String    @db.VarChar(255)
  description     String?   @db.Text
  durationSeconds Int       @default(0)
  occurredAt      DateTime
  metadata        Json?
  createdAt       DateTime  @default(now())

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

  @@index([userId])
  @@index([occurredAt])
}

model ActiveRecallQuestion {
  id              BigInt    @id @default(autoincrement())
  userId          BigInt
  knowledgeItemId BigInt?
  questionText    String    @db.Text
  difficulty      String?   @db.VarChar(32)
  createdBy       String    @default("ai") @db.VarChar(32)
  createdAt       DateTime  @default(now())
  updatedAt       DateTime  @updatedAt

  user            User      @relation(fields: [userId], references: [id])
  answers         ActiveRecallAnswer[]

  @@index([userId])
  @@index([knowledgeItemId])
}

model ActiveRecallAnswer {
  id          BigInt    @id @default(autoincrement())
  userId      BigInt
  questionId  BigInt?
  sessionId   BigInt?
  answerType  String    @default("text") @db.VarChar(32)
  answerText  String?   @db.LongText
  audioFileId BigInt?
  submittedAt DateTime
  createdAt   DateTime  @default(now())

  user        User      @relation(fields: [userId], references: [id])
  question    ActiveRecallQuestion? @relation(fields: [questionId], references: [id])

  @@index([userId])
  @@index([questionId])
  @@index([sessionId])
}

model AiAnalysisJob {
  id             BigInt            @id @default(autoincrement())
  userId         BigInt
  sessionId      BigInt?
  answerId       BigInt?
  jobType        String            @db.VarChar(32)
  status         String            @default("pending") @db.VarChar(32)
  progress       Int               @default(0)
  errorMessage   String?           @db.Text
  queuedAt       DateTime?
  startedAt      DateTime?
  completedAt    DateTime?
  createdAt      DateTime          @default(now())
  updatedAt      DateTime          @updatedAt

  user           User              @relation(fields: [userId], references: [id])
  results        AiAnalysisResult[]

  @@index([userId])
  @@index([status])
  @@index([sessionId])
}

model AiAnalysisResult {
  id             BigInt            @id @default(autoincrement())
  userId         BigInt
  jobId          BigInt
  sessionId      BigInt?
  answerId       BigInt?
  summary        String?           @db.Text
  masteryScore   Int?
  strengths      Json?
  weaknesses     Json?
  suggestions    Json?
  nextActions    Json?
  rawResult      Json?
  createdAt      DateTime          @default(now())
  updatedAt      DateTime          @updatedAt

  user           User              @relation(fields: [userId], references: [id])
  job            AiAnalysisJob     @relation(fields: [jobId], references: [id])

  @@index([userId])
  @@index([jobId])
  @@index([sessionId])
}

model FocusItem {
  id               BigInt    @id @default(autoincrement())
  userId           BigInt
  knowledgeBaseId  BigInt?
  knowledgeItemId  BigInt?
  analysisResultId BigInt?
  title            String    @db.VarChar(255)
  reason           String?   @db.Text
  suggestion       String?   @db.Text
  priority         String    @default("normal") @db.VarChar(32)
  status           String    @default("open") @db.VarChar(32)
  masteryScore     Int?
  dueAt            DateTime?
  completedAt      DateTime?
  createdAt        DateTime  @default(now())
  updatedAt        DateTime  @updatedAt
  deletedAt        DateTime?

  user             User      @relation(fields: [userId], references: [id])
  knowledgeBase    KnowledgeBase? @relation(fields: [knowledgeBaseId], references: [id])

  @@index([userId])
  @@index([status])
  @@index([dueAt])
}

model ReviewCard {
  id              BigInt       @id @default(autoincrement())
  userId          BigInt
  knowledgeItemId BigInt?
  focusItemId     BigInt?
  frontText       String       @db.Text
  backText        String?      @db.Text
  difficulty      String?      @db.VarChar(32)
  status          String       @default("active") @db.VarChar(32)
  nextReviewAt    DateTime?
  intervalDays    Int          @default(1)
  easeFactor      Decimal      @default(2.50) @db.Decimal(4, 2)
  repetitionCount Int          @default(0)
  lapseCount      Int          @default(0)
  createdAt       DateTime     @default(now())
  updatedAt       DateTime     @updatedAt
  deletedAt       DateTime?

  user            User         @relation(fields: [userId], references: [id])
  logs            ReviewLog[]

  @@index([userId])
  @@index([nextReviewAt])
  @@index([focusItemId])
}

model ReviewLog {
  id           BigInt     @id @default(autoincrement())
  userId       BigInt
  reviewCardId BigInt
  sessionId    BigInt?
  rating       String     @db.VarChar(32)
  responseText String?    @db.Text
  reviewedAt   DateTime
  nextReviewAt DateTime?
  createdAt    DateTime   @default(now())

  user         User       @relation(fields: [userId], references: [id])
  reviewCard   ReviewCard @relation(fields: [reviewCardId], references: [id])

  @@index([userId])
  @@index([reviewCardId])
  @@index([reviewedAt])
}

model ReviewPlan {
  id          BigInt    @id @default(autoincrement())
  userId      BigInt
  title       String    @db.VarChar(255)
  status      String    @default("active") @db.VarChar(32)
  scheduledAt DateTime?
  completedAt DateTime?
  cardCount   Int       @default(0)
  createdAt   DateTime  @default(now())
  updatedAt   DateTime  @updatedAt

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

  @@index([userId])
  @@index([scheduledAt])
}

model DailyLearningActivity {
  id                 BigInt    @id @default(autoincrement())
  userId             BigInt
  activityDate       DateTime  @db.Date
  durationSeconds    Int       @default(0)
  sessionsCount      Int       @default(0)
  activeRecallCount  Int       @default(0)
  reviewCount        Int       @default(0)
  aiAnalysisCount    Int       @default(0)
  completedLoopCount Int       @default(0)
  activityLevel      Int       @default(0)
  createdAt          DateTime  @default(now())
  updatedAt          DateTime  @updatedAt

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

  @@unique([userId, activityDate])
  @@index([userId])
}

model Notification {
  id        BigInt    @id @default(autoincrement())
  userId    BigInt
  type      String    @db.VarChar(32)
  title     String    @db.VarChar(255)
  content   String?   @db.Text
  data      Json?
  readAt    DateTime?
  createdAt DateTime  @default(now())

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

  @@index([userId])
  @@index([readAt])
  @@index([type])
}

model Feedback {
  id         BigInt    @id @default(autoincrement())
  userId     BigInt?
  email      String?   @db.VarChar(255)
  category   String    @db.VarChar(64)
  content    String    @db.Text
  deviceInfo Json?
  status     String    @default("open") @db.VarChar(32)
  createdAt  DateTime  @default(now())
  updatedAt  DateTime  @updatedAt

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

  @@index([userId])
  @@index([status])
}

model AppChangelog {
  id          BigInt    @id @default(autoincrement())
  version     String    @db.VarChar(50)
  title       String    @db.VarChar(255)
  content     String    @db.Text
  platform    String    @default("ios") @db.VarChar(32)
  publishedAt DateTime?
  createdAt   DateTime  @default(now())
  updatedAt   DateTime  @updatedAt
}