// Prisma Schema for OfflineU2
// Models: Course, Module, Lesson, Progress

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

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

model Course {
  id          String   @id @default(cuid())
  name        String
  displayName String?
  slug        String   @unique
  path        String   @unique
  thumbnail   String?
  description String?
  hidden      Boolean  @default(false)
  favorited   Boolean  @default(false)
  createdAt   DateTime @default(now())
  updatedAt   DateTime @updatedAt

  modules     Module[]
  progress    Progress[]
  bookmarks   Bookmark[]
  courseTags  CourseTag[]
  tags        Tag[]    @relation("CourseTags")

  @@index([slug])
  @@index([path])
  @@index([favorited])
}

model Module {
  id          String   @id @default(cuid())
  name        String
  slug        String
  order       Int      @default(0)
  courseId    String
  course      Course   @relation(fields: [courseId], references: [id], onDelete: Cascade)
  createdAt   DateTime @default(now())
  updatedAt   DateTime @updatedAt

  lessons     Lesson[]
  progress    Progress[]
  bookmarks   Bookmark[]

  @@unique([courseId, slug])
  @@index([courseId, order])
}

model Lesson {
  id          String   @id @default(cuid())
  title       String
  slug        String
  order       Int      @default(0)
  moduleId    String
  module      Module   @relation(fields: [moduleId], references: [id], onDelete: Cascade)
  filePath    String
  fileName    String
  mimeType    String
  duration    Int?
  thumbnail   String?
  type        String   @default("VIDEO")
  subtitlePath String?
  createdAt   DateTime @default(now())
  updatedAt   DateTime @updatedAt

  progress    Progress[]
  bookmarks   Bookmark[]
  subtitles    SubtitleTrack[]
  quiz         Quiz?
  quizAttempts  QuizAttempt[]

  @@unique([moduleId, slug])
  @@index([moduleId, order])
  @@index([filePath])
}

model SubtitleTrack {
  id        String   @id @default(cuid())
  lessonId  String
  lesson    Lesson   @relation(fields: [lessonId], references: [id], onDelete: Cascade)
  src       String
  lang      String
  label     String
  format    String
  isDefault Boolean  @default(false)
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@unique([lessonId, lang, src])
  @@index([lessonId])
}

model Progress {
  id          String   @id @default(cuid())
  userId      String   @default("local-user")
  courseId    String
  course      Course   @relation(fields: [courseId], references: [id], onDelete: Cascade)
  moduleId    String?
  module      Module?  @relation(fields: [moduleId], references: [id], onDelete: Cascade)
  lessonId    String?
  lesson      Lesson?  @relation(fields: [lessonId], references: [id], onDelete: Cascade)
  completed   Boolean  @default(false)
  position    Int      @default(0)
  lastWatched DateTime @default(now())
  createdAt   DateTime @default(now())
  updatedAt   DateTime @updatedAt

  @@unique([userId, lessonId])
  @@index([userId, courseId])
  @@index([userId, lastWatched])
}

model QuizAttempt {
  id         String   @id @default(cuid())
  userId     String   @default("local-user")
  lessonId   String?
  lesson     Lesson?  @relation(fields: [lessonId], references: [id], onDelete: Cascade)
  score      Int      @default(0)
  passed     Boolean  @default(false)
  completed  Boolean  @default(false)
  createdAt  DateTime @default(now())
  updatedAt  DateTime @updatedAt

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

model Quiz {
  id          String   @id @default(cuid())
  title       String
  description String?
  lessonId    String?  @unique
  lesson      Lesson?  @relation(fields: [lessonId], references: [id], onDelete: Cascade)
  source      String?
  topic       String?
  createdAt   DateTime @default(now())
  updatedAt   DateTime @updatedAt

  questions   Question[]

  @@index([lessonId])
}

model Question {
  id          String    @id @default(cuid())
  quizId      String
  quiz        Quiz      @relation(fields: [quizId], references: [id], onDelete: Cascade)
  type        String
  text        String
  options     String?
  correctAnswer String?
  order       Int       @default(0)
  createdAt   DateTime  @default(now())
  updatedAt   DateTime  @updatedAt

  @@index([quizId])
}

model Bookmark {
  id          String   @id @default(cuid())
  userId      String   @default("local-user")
  courseId    String
  course      Course   @relation(fields: [courseId], references: [id], onDelete: Cascade)
  moduleId    String
  module      Module   @relation(fields: [moduleId], references: [id], onDelete: Cascade)
  lessonId    String
  lesson      Lesson   @relation(fields: [lessonId], references: [id], onDelete: Cascade)
  position    Int
  note        String?
  createdAt   DateTime @default(now())
  updatedAt   DateTime @updatedAt

  @@index([userId, lessonId])
  @@index([userId, courseId])
  @@index([userId, createdAt])
}

model Setting {
  id        String   @id @default(cuid())
  key       String   @unique
  value     String
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt
}

model Tag {
  id        String    @id @default(cuid())
  name      String    @unique
  color     String?
  createdAt DateTime  @default(now())
  updatedAt DateTime  @updatedAt

  courseTags CourseTag[]
  courses    Course[]  @relation("CourseTags")
}

model CourseTag {
  courseId String
  tagId    String
  course   Course @relation(fields: [courseId], references: [id], onDelete: Cascade)
  tag      Tag    @relation(fields: [tagId], references: [id], onDelete: Cascade)

  @@id([courseId, tagId])
  @@index([tagId])
  @@index([courseId])
}