// ReLoop v2 schema — persona forgetting curve model
// Generated fresh; old FSRS fields dropped. DB reset via `prisma migrate reset`.
//
// NOTE: After editing tag-relation onDelete rules, run:
//   prisma migrate dev --name relax_tag_cascade
// on the Dev VM before deploying. This migrates SkillSnapshot.tagId to nullable
// and sets both SkillSnapshot and StudyLog tag FKs to ON DELETE SET NULL.

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

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

// ─── Enums ────────────────────────────────────────────────────────

enum Persona {
  senior
  mid
  junior
  crammer
}

enum ReviewIntensity {
  strict
  moderate
  relaxed
}

enum StudyResult {
  correct
  incorrect
  partial
}

enum ReviewStatus {
  pending
  done
  skipped
  expired
}

enum MathUnit {
  common
  prob_stat
  calculus
  geometry
}

enum SubscriptionTier {
  free
  pro
  school
}

enum OrgType {
  school
  academy
}

enum OrgRole {
  admin
  teacher
  student
}

enum AssignmentStatus {
  active
  closed
  draft
}

// ─── Models ───────────────────────────────────────────────────────

model User {
  id                Int              @id @default(autoincrement())
  email             String           @unique
  password          String
  nickname          String
  avatarUrl         String?
  persona           Persona          @default(mid)
  currentGrade      Int?
  targetGrade       Int?
  targetExamYear    Int?
  focusSubjects     Json?
  focusUnits        Json?
  bojHandle         String?          @db.VarChar(32)
  reviewIntensity   ReviewIntensity  @default(moderate)
  onboardedAt       DateTime?
  subscriptionTier  SubscriptionTier @default(free)
  subscriptionUntil DateTime?
  createdAt         DateTime         @default(now())
  updatedAt         DateTime         @updatedAt

  subjects              Subject[]
  studyLogs             StudyLog[]
  psBookmarks           PsBookmark[]
  psSyncState           PsSyncState?
  reviewSchedules       ReviewSchedule[]
  skillSnapshots        SkillSnapshot[]
  organizationMembers   OrganizationMember[]
  classMemberships      ClassMember[]
  teacherClasses        Class[]                @relation("teacherClasses")
  assignmentSubmissions AssignmentSubmission[]

  @@map("users")
}

model Subject {
  id        Int      @id @default(autoincrement())
  name      String
  color     String   @default("#6366f1")
  userId    Int
  user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)
  createdAt DateTime @default(now())

  tags      Tag[]
  studyLogs StudyLog[]

  @@unique([userId, name])
  @@index([userId])
  @@map("subjects")
}

model Tag {
  id        Int      @id @default(autoincrement())
  name      String
  subjectId Int
  subject   Subject  @relation(fields: [subjectId], references: [id], onDelete: Cascade)
  createdAt DateTime @default(now())

  studyLogs      StudyLog[]
  skillSnapshots SkillSnapshot[]

  @@unique([subjectId, name])
  @@index([subjectId])
  @@map("tags")
}

model StudyLog {
  id          Int        @id @default(autoincrement())
  userId      Int
  user        User       @relation(fields: [userId], references: [id], onDelete: Cascade)
  subjectId   Int
  subject     Subject    @relation(fields: [subjectId], references: [id])
  tagId       Int?
  tag         Tag?       @relation(fields: [tagId], references: [id], onDelete: SetNull)
  problemId   Int?
  problem     Problem?   @relation(fields: [problemId], references: [id], onDelete: SetNull)
  psProblemId Int?
  psProblem   PsProblem? @relation(fields: [psProblemId], references: [id], onDelete: SetNull)

  title           String
  difficulty      Float
  baseCorrectRate Float?
  result          StudyResult
  chosenAnswer    Int?
  memo            String?     @db.Text
  studiedAt       DateTime    @default(now())
  timeSpent       Int?

  reviewSchedules ReviewSchedule[]

  @@index([userId, studiedAt])
  @@index([subjectId])
  @@index([tagId])
  @@index([problemId])
  @@index([psProblemId])
  @@map("study_logs")
}

model ReviewSchedule {
  id         Int      @id @default(autoincrement())
  userId     Int
  user       User     @relation(fields: [userId], references: [id], onDelete: Cascade)
  studyLogId Int
  studyLog   StudyLog @relation(fields: [studyLogId], references: [id], onDelete: Cascade)

  scheduledAt DateTime
  reviewedAt  DateTime?
  result      StudyResult?
  iteration   Int          @default(0)
  predictedP  Float?
  status      ReviewStatus @default(pending)

  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@index([userId, status, scheduledAt])
  @@index([studyLogId])
  @@map("review_schedules")
}

/// 평가원/수능/모의평가 등 공개 기출 문제를 담는 컨테이너.
/// Subject 와 별개로 존재 — 모든 사용자가 공유하며 읽기 전용.
model ProblemSet {
  id          Int       @id @default(autoincrement())
  title       String
  /// examType 허용값: "sat" | "mock-june" | "mock-sept" | "academy"
  examType    String
  year        Int
  subjectName String
  mathUnit    MathUnit?
  sourceUrl   String?
  /// 듣기 음원 파일 경로 배열 (data/kice/ 상대경로).
  /// 예: ["2026/listening/audios/01_track.mp3", ...]
  audioUrls   Json?
  createdAt   DateTime  @default(now())

  problems    Problem[]
  passages    Passage[]
  assignments Assignment[]

  @@unique([year, examType, subjectName, mathUnit])
  @@map("problem_sets")
}

model Organization {
  id         Int      @id @default(autoincrement())
  name       String
  type       OrgType  @default(academy)
  inviteCode String   @unique @db.VarChar(12)
  createdAt  DateTime @default(now())
  updatedAt  DateTime @updatedAt

  members OrganizationMember[]
  classes Class[]

  @@map("organizations")
}

model OrganizationMember {
  id             Int          @id @default(autoincrement())
  userId         Int
  user           User         @relation(fields: [userId], references: [id], onDelete: Cascade)
  organizationId Int
  organization   Organization @relation(fields: [organizationId], references: [id], onDelete: Cascade)
  role           OrgRole      @default(student)
  joinedAt       DateTime     @default(now())

  @@unique([userId, organizationId])
  @@index([organizationId])
  @@map("organization_members")
}

model Class {
  id             Int          @id @default(autoincrement())
  name           String
  organizationId Int
  organization   Organization @relation(fields: [organizationId], references: [id], onDelete: Cascade)
  teacherId      Int
  teacher        User         @relation("teacherClasses", fields: [teacherId], references: [id])
  createdAt      DateTime     @default(now())

  members     ClassMember[]
  assignments Assignment[]

  @@index([organizationId])
  @@index([teacherId])
  @@map("classes")
}

model ClassMember {
  id       Int      @id @default(autoincrement())
  userId   Int
  user     User     @relation(fields: [userId], references: [id], onDelete: Cascade)
  classId  Int
  class    Class    @relation(fields: [classId], references: [id], onDelete: Cascade)
  joinedAt DateTime @default(now())

  @@unique([userId, classId])
  @@index([classId])
  @@map("class_members")
}

model Assignment {
  id           Int              @id @default(autoincrement())
  title        String
  description  String?          @db.Text
  classId      Int
  class        Class            @relation(fields: [classId], references: [id], onDelete: Cascade)
  problemSetId Int
  problemSet   ProblemSet       @relation(fields: [problemSetId], references: [id])
  status       AssignmentStatus @default(active)
  dueDate      DateTime?
  createdAt    DateTime         @default(now())

  submissions AssignmentSubmission[]

  @@index([classId])
  @@index([problemSetId])
  @@map("assignments")
}

model AssignmentSubmission {
  id            Int        @id @default(autoincrement())
  userId        Int
  user          User       @relation(fields: [userId], references: [id], onDelete: Cascade)
  assignmentId  Int
  assignment    Assignment @relation(fields: [assignmentId], references: [id], onDelete: Cascade)
  score         Float?
  totalProblems Int?
  correctCount  Int?
  completedAt   DateTime?
  studyLogIds   Json?
  createdAt     DateTime   @default(now())

  @@unique([userId, assignmentId])
  @@index([assignmentId])
  @@map("assignment_submissions")
}

model Problem {
  id              Int        @id @default(autoincrement())
  problemSetId    Int
  problemSet      ProblemSet @relation(fields: [problemSetId], references: [id], onDelete: Cascade)
  number          Int
  title           String
  difficulty      Float
  baseCorrectRate Float?
  topic           String?
  /// KICE 파싱 결과 — 본문 텍스트 (선택지 제외)
  bodyText        String?    @db.Text
  /// KICE 파싱 결과 — 선택지 객체 { "1": "...", "2": "...", "3": "...", "4": "...", "5": "..." }
  choices         Json?
  /// 렌더링된 문제 이미지 URL (수학/도표형 문제 대응)
  imageUrl        String?
  /// 렌더링된 원본 페이지 이미지 URL
  pageImageUrl    String?
  /// KICE 파싱 결과 — 정답 번호 1..5
  answerNumber    Int?
  /// 공통 지문 FK (여러 문제가 공유하는 지문)
  passageId       Int?
  passage         Passage?   @relation(fields: [passageId], references: [id], onDelete: SetNull)
  /// 파싱 엣지케이스 플래그 — 수동 보정 대상
  needsReview     Boolean    @default(false)
  createdAt       DateTime   @default(now())

  studyLogs StudyLog[]

  @@unique([problemSetId, number])
  @@index([problemSetId])
  @@index([passageId])
  @@map("problems")
}

/// 평가원 기출의 [N~M] 공통 지문을 담는 컨테이너.
/// 여러 Problem 이 같은 Passage 를 공유할 수 있음.
model Passage {
  id           Int        @id @default(autoincrement())
  problemSetId Int
  problemSet   ProblemSet @relation(fields: [problemSetId], references: [id], onDelete: Cascade)
  startNumber  Int
  endNumber    Int
  bodyText     String     @db.Text
  imageUrl     String?
  createdAt    DateTime   @default(now())

  problems Problem[]

  @@index([problemSetId])
  @@map("passages")
}

model SkillSnapshot {
  id     Int  @id @default(autoincrement())
  userId Int
  user   User @relation(fields: [userId], references: [id], onDelete: Cascade)
  tagId  Int?
  tag    Tag? @relation(fields: [tagId], references: [id], onDelete: SetNull)

  s0            Float
  lastUpdatedAt DateTime @default(now())
  sampleCount   Int      @default(0)

  @@unique([userId, tagId])
  @@index([userId])
  @@map("skill_snapshots")
}

model PsProblem {
  id                Int       @id @default(autoincrement())
  bojId             Int       @unique
  title             String
  titleKo           String?
  level             Int
  tags              Json?
  acceptedUserCount Int?
  averageTries      Float?
  solvedacUpdatedAt DateTime?
  createdAt         DateTime  @default(now())
  updatedAt         DateTime  @updatedAt

  bookmarks PsBookmark[]
  studyLogs StudyLog[]

  @@index([level])
  @@map("ps_problems")
}

model PsBookmark {
  id          Int       @id @default(autoincrement())
  userId      Int
  user        User      @relation(fields: [userId], references: [id], onDelete: Cascade)
  psProblemId Int
  psProblem   PsProblem @relation(fields: [psProblemId], references: [id], onDelete: Cascade)
  memo        String?
  createdAt   DateTime  @default(now())

  @@unique([userId, psProblemId])
  @@index([userId])
  @@map("ps_bookmarks")
}

model PsSyncState {
  id              Int       @id @default(autoincrement())
  userId          Int       @unique
  user            User      @relation(fields: [userId], references: [id], onDelete: Cascade)
  lastSyncedAt    DateTime?
  lastSolvedCount Int       @default(0)
  lastTier        Int?
  updatedAt       DateTime  @updatedAt

  @@map("ps_sync_states")
}