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

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

enum Role {
  ADMIN
  TEACHER
  STUDENT
  GUEST
}

model User {
  id            String          @id @default(cuid())
  name          String?
  email         String?         @unique
  password      String?
  emailVerified DateTime?
  image         String?
  accounts      Account[]
  sessions      Session[]
  // Optional for WebAuthn support
  Authenticator Authenticator[]

  role     Role      @default(GUEST)
  problems Problem[]

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

enum Difficulty {
  EASY
  MEDIUM
  HARD
}

model Problem {
  id          String     @id @default(cuid())
  title       String
  description String
  solution    String
  difficulty  Difficulty @default(EASY)
  published   Boolean    @default(false)
  userId      String
  user        User       @relation(fields: [userId], references: [id], onDelete: Cascade)
  templates   Template[]

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

enum EditorLanguage {
  c
  cpp
}

model EditorLanguageConfig {
  id            String         @id @default(cuid())
  language      EditorLanguage
  label         String
  fileName      String
  fileExtension String
}

model Template {
  language  EditorLanguage
  template  String
  problemId String
  problem   Problem        @relation(fields: [problemId], references: [id], onDelete: Cascade)

  @@id([problemId, language])
}

model Account {
  userId            String
  type              String
  provider          String
  providerAccountId String
  refresh_token     String?
  access_token      String?
  expires_at        Int?
  token_type        String?
  scope             String?
  id_token          String?
  session_state     String?

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

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

  @@id([provider, providerAccountId])
}

model Session {
  sessionToken String   @unique
  userId       String
  expires      DateTime
  user         User     @relation(fields: [userId], references: [id], onDelete: Cascade)

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

model VerificationToken {
  identifier String
  token      String
  expires    DateTime

  @@id([identifier, token])
}

// Optional for WebAuthn support
model Authenticator {
  credentialID         String  @unique
  userId               String
  providerAccountId    String
  credentialPublicKey  String
  counter              Int
  credentialDeviceType String
  credentialBackedUp   Boolean
  transports           String?

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

  @@id([userId, credentialID])
}