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

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

model User {
  id        String   @id @default(uuid())
  username  String   @unique
  password  String
  createdAt DateTime @default(now())
}

model Branch {
  id          String       @id @default(uuid())
  name        String
  address     String?
  phone       String?
  instructors Instructor[] // Implicit many-to-many
  classes     DanceClass[]
  lessons     Lesson[]
  students    Student[]
  createdAt   DateTime     @default(now())
  updatedAt   DateTime     @updatedAt
}

model Instructor {
  id        String       @id @default(uuid())
  name      String
  bio       String?
  phone     String?
  branches  Branch[]     // Implicit many-to-many
  classes   DanceClass[]
  lessons   Lesson[]
  createdAt DateTime     @default(now())
  updatedAt DateTime     @updatedAt
}

model DanceClass {
  id           String     @id @default(uuid())
  name         String
  description  String?
  branchId     String
  branch       Branch     @relation(fields: [branchId], references: [id])
  instructorId String?
  instructor   Instructor? @relation(fields: [instructorId], references: [id])
  lessons      Lesson[]
  fees         Fee[]
  createdAt    DateTime   @default(now())
  updatedAt    DateTime   @updatedAt
}

model Lesson {
  id           String     @id @default(uuid())
  name         String?    // Optional name e.g. "Special Workshop"
  startTime    DateTime
  endTime      DateTime
  type         String     // GROUP, PRIVATE
  branchId     String
  branch       Branch     @relation(fields: [branchId], references: [id])
  instructorId String
  instructor   Instructor @relation(fields: [instructorId], references: [id])
  classId      String?
  class        DanceClass? @relation(fields: [classId], references: [id])
  createdAt    DateTime   @default(now())
  updatedAt    DateTime   @updatedAt
}

model Fee {
  id        String      @id @default(uuid())
  name      String
  amount    Float
  currency  String      @default("TRY")
  type      String      // MONTHLY, PER_LESSON, PACKAGE
  classId   String?
  class     DanceClass? @relation(fields: [classId], references: [id])
  createdAt DateTime    @default(now())
  updatedAt DateTime    @updatedAt
}

model Student {
  id        String   @id @default(uuid())
  name      String
  email     String?
  phone     String
  birthDate DateTime
  branchId  String?
  branch    Branch?  @relation(fields: [branchId], references: [id])
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt
}