generator client {
  provider = "prisma-client-js"
  output   = "../src/generated/prisma"
}

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

model Course {
  id          Int          @id @default(autoincrement())
  name        String
  description String?
  classes     Class[]
  assignments Assignment[]
  teacherId   String
  createdAt   DateTime     @default(now())
  updatedAt   DateTime     @updatedAt

  @@unique([teacherId, name])
  @@index([teacherId])
}

model Class {
  id          Int          @id @default(autoincrement())
  name        String
  description String?
  courseId    Int
  teacherId   String
  course      Course       @relation(fields: [courseId], references: [id], onDelete: Cascade)
  assignments Assignment[]
  students    ClassStudent[]
  createdAt   DateTime     @default(now())
  updatedAt   DateTime     @updatedAt

  @@unique([courseId, name])
  @@index([teacherId])
}

model Assignment {
  id           Int          @id @default(autoincrement())
  title        String
  description  String?
  courseId     Int
  classroomId  Int
  formSchema   Json?
  teacherId    String
  gradingCriteria String?
  autoEvaluate Boolean      @default(false)
  course       Course    @relation(fields: [courseId], references: [id], onDelete: Cascade)
  classroom    Class     @relation(fields: [classroomId], references: [id], onDelete: Cascade)
  submissions  Submission[]
  createdAt    DateTime   @default(now())
  updatedAt    DateTime   @updatedAt

  @@unique([classroomId, title])
  @@index([teacherId])
}

model Submission {
  id                 Int       @id @default(autoincrement())
  assignmentId       Int
  studentId          String
  studentName        String    @default("")
  originalFilename   String
  fileUrl            String
  fileKey            String?
  submittedAt        DateTime  @default(now())
  formPayload        Json?
  evaluationScore    Float?
  evaluationComment  String?
  evaluatedAt        DateTime?
  assignment         Assignment @relation(fields: [assignmentId], references: [id], onDelete: Cascade)

  @@unique([assignmentId, studentId])
}

model ClassStudent {
  id           Int      @id @default(autoincrement())
  classroomId  Int
  studentId    String
  studentName  String
  createdAt    DateTime @default(now())
  updatedAt    DateTime @updatedAt
  classroom    Class    @relation(fields: [classroomId], references: [id], onDelete: Cascade)

  @@unique([classroomId, studentId])
}