// This is your Prisma schema file,
// learn more about it in the docs: https://pris.ly/d/prisma-schema

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

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

model User {
  id        Int      @id @default(autoincrement())
  email     String   @unique
  username  String   @unique
  password  String
  role      String   @default("Student")
  
  // Password Reset
  passwordResetToken   String?
  passwordResetExpires DateTime?

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

  receivedGrades         Grade[]           @relation("ReceivedGrades") // Noten, die Schüler erhalten haben
  assignedGrades         Grade[]           @relation("AssignedGrades") // Noten, die Lehrer vergeben haben
  chatMessages           ChatMessage[]
  chatGroups             ChatGroupMember[]
  studentFeedbacks       Feedback[]        @relation("StudentFeedbacks")
  teacherFeedbacks       Feedback[]        @relation("TeacherFeedbacks")
  taughtTimetableEntries TimetableEntry[]  @relation("TeacherTimetableEntries")
  createdChatGroups      ChatGroup[]       @relation("ChatGroupCreator")
  uploadedFiles          File[]
}

// Neue Tabelle: File (Dateien)
model File {
  id        Int      @id @default(autoincrement())
  filename  String
  path      String
  mimetype  String
  size      Int
  
  uploadedById Int
  uploadedBy   User @relation(fields: [uploadedById], references: [id], onDelete: Cascade)

  timetableEntryId Int?
  timetableEntry   TimetableEntry? @relation(fields: [timetableEntryId], references: [id], onDelete: Cascade)
  
  createdAt DateTime @default(now())
  
  @@index([uploadedById])
  @@index([timetableEntryId])
}

// Neue Tabelle: Subject (Fächer)
model Subject {
  id               Int              @id @default(autoincrement())
  name             String           @unique // z.B. "Mathematik", "Deutsch", "Englisch"
  abbreviation     String?          // z.B. "Mathe", "DE", "EN"
  color            String?          // Farbe für UI (z.B. "#FF5733")
  createdAt        DateTime         @default(now())
  updatedAt        DateTime         @updatedAt
  timetableEntries TimetableEntry[]

  @@index([name])
}

// Neue Tabelle: Room (Räume)
model Room {
  id               Int              @id @default(autoincrement())
  number           String           @unique // z.B. "A101", "B203"
  building         String?          // z.B. "Hauptgebäude", "Neubau"
  capacity         Int?             // Anzahl Sitzplätze
  equipment        String?          // z.B. "Beamer, Whiteboard"
  createdAt        DateTime         @default(now())
  updatedAt        DateTime         @updatedAt
  timetableEntries TimetableEntry[]

  @@index([number])
}

model TimetableEntry {
  id        Int      @id @default(autoincrement())
  dayOfWeek Int      // 1 = Montag, 2 = Dienstag, ..., 5 = Freitag
  startTime String   // Format: "08:00"
  endTime   String   // Format: "09:30"

  // Normalisierte Relationen
  subjectId Int
  subject   Subject @relation(fields: [subjectId], references: [id], onDelete: Restrict)

  teacherId Int?
  teacher   User? @relation("TeacherTimetableEntries", fields: [teacherId], references: [id], onDelete: SetNull)

  roomId Int?
  room   Room? @relation(fields: [roomId], references: [id], onDelete: SetNull)

  // Wochenbasierte Planung
  weekNumber  Int?    // Kalenderwoche (1-53), null = alle Wochen
  year        Int?    // Jahr (z.B. 2025), null = alle Jahre
  isRecurring Boolean @default(true) // true = wiederholt sich jede Woche, false = nur für spezifische Woche

  allowStudentUploads Boolean @default(false)
  files               File[]

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

  feedbacks Feedback[]
  grades    Grade[]

  @@index([dayOfWeek])
  @@index([weekNumber, year])
  @@index([subjectId])
  @@index([teacherId])
  @@index([roomId])
}

model Feedback {
  id Int @id @default(autoincrement())

  // Foreign Key Relations zu User-Tabelle
  studentId Int
  student   User @relation("StudentFeedbacks", fields: [studentId], references: [id], onDelete: Cascade)

  teacherId Int
  teacher   User @relation("TeacherFeedbacks", fields: [teacherId], references: [id], onDelete: Cascade)

  // Foreign Key Relation zu TimetableEntry
  lessonId       Int
  timetableEntry TimetableEntry @relation(fields: [lessonId], references: [id], onDelete: Cascade)
  lessonDate     DateTime

  overallRating Int

  // Prisma Json-Typ für Kategorien
  categories Json?

  whatWasGood        String?
  whatCanImprove     String?
  additionalComments String?

  isAnonymous          Boolean @default(false)
  allowTeacherResponse Boolean @default(true)

  teacherResponse    String?
  teacherRespondedAt DateTime?

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

  // Unique Constraint: Ein Schüler kann nur einmal pro Stunde Feedback geben
  @@unique([studentId, lessonId])
  @@index([studentId])
  @@index([teacherId])
  @@index([lessonId])
}

model Grade {
  id Int @id @default(autoincrement())

  // Schüler-Information (erhält die Note)
  studentId Int
  student   User @relation("ReceivedGrades", fields: [studentId], references: [id], onDelete: Cascade)

  // Stundenplan-Bezug
  timetableEntryId Int
  timetableEntry   TimetableEntry @relation(fields: [timetableEntryId], references: [id], onDelete: Cascade)

  // Wochenbezug (Note gilt für eine spezifische Woche)
  weekNumber Int // Kalenderwoche (1-53)
  year       Int // Jahr (z.B. 2025)

  // Noten-Details
  grade     Float   // z.B. 1.0, 2.5, 3.0 (deutsches Notensystem)
  gradeType String  // z.B. "Klausur", "Mitarbeit", "Hausaufgabe", "Mündlich"
  weight    Float?  @default(1.0) // Gewichtung der Note (z.B. Klausur = 2.0, Mitarbeit = 1.0)

  // Lehrer-Information (vergibt die Note)
  teacherId Int
  teacher   User @relation("AssignedGrades", fields: [teacherId], references: [id], onDelete: Restrict)

  // Optional: Detailbeschreibung
  title          String? // z.B. "Mathearbeit Kapitel 3"
  description    String? // Zusätzliche Informationen
  maxPoints      Float? // Maximale Punktzahl
  achievedPoints Float? // Erreichte Punktzahl

  // Datum
  date DateTime // Datum der Leistung

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

  @@unique([studentId, timetableEntryId, weekNumber, year, gradeType])
  @@index([studentId])
  @@index([timetableEntryId])
  @@index([teacherId])
  @@index([weekNumber, year])
}

model ChatGroup {
  id          Int      @id @default(autoincrement())
  name        String
  description String?

  createdById Int  // Lehrer, der die Gruppe erstellt hat
  createdBy   User @relation("ChatGroupCreator", fields: [createdById], references: [id], onDelete: Restrict)

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

  members  ChatGroupMember[]
  messages ChatMessage[]

  @@index([createdById])
}

model ChatGroupMember {
  id      Int  @id @default(autoincrement())

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

  groupId Int
  group   ChatGroup @relation(fields: [groupId], references: [id], onDelete: Cascade)

  joinedAt DateTime @default(now())

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

model ChatMessage {
  id      Int    @id @default(autoincrement())
  content String

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

  groupId Int
  group   ChatGroup @relation(fields: [groupId], references: [id], onDelete: Cascade)

  createdAt DateTime @default(now())

  @@index([groupId])
  @@index([userId])
  @@index([createdAt])
}

model Student {
  studentId           Int             @id @default(autoincrement()) @map("student_id")
  studentFirstName    String          @map("student_first_name")
  studentLastName     String          @map("student_last_name")
  studentClassName    String?         @map("student_class_name")
  studentRfidCardUid  String          @unique @map("student_rfid_card_uid")
  studentCardIsActive Boolean         @default(true) @map("student_card_is_active")
  attendanceLogs      AttendanceLog[]

  @@map("students")
}

model AttendanceLog {
  attendanceLogId     Int      @id @default(autoincrement()) @map("attendance_log_id")
  studentId           Int      @map("student_id")
  student             Student  @relation(fields: [studentId], references: [studentId], onDelete: Cascade)
  attendanceScannedAt DateTime @map("attendance_scanned_at")
  attendanceEventType String   @map("attendance_event_type")
  wasManualEntry      Boolean  @default(false) @map("was_manual_entry")
  manualEntryReason   String?  @map("manual_entry_reason")

  @@index([studentId, attendanceScannedAt])
  @@map("attendance_logs")
}