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

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

model User {
  // lucia internal fields
  id       String    @id
  sessions Session[]

  // custom fields
  username String @unique
  password String

  entities   Entity[]
  payments   Payment[]
  categories Category[]

  @@map("lucia_user")
}

model Session {
  // lucia internal fields
  id        String   @id
  userId    String
  expiresAt DateTime
  user      User     @relation(references: [id], fields: [userId], onDelete: Cascade)

  @@map("lucia_session")
}

model Entity {
  id                Int        @id @default(autoincrement())
  userId            String     @map("user_id")
  user              User       @relation(fields: [userId], references: [id])
  name              String
  type              EntityType
  defaultCategory   Category?  @relation(fields: [defaultCategoryId], references: [id])
  defaultCategoryId Int?       @map("default_category_id")
  createdAt         DateTime   @default(now()) @map("created_at")
  updatedAt         DateTime   @updatedAt @map("updated_at")

  paymentsAsPayor Payment[] @relation("PayorEntity")
  paymentsAsPayee Payment[] @relation("PayeeEntity")

  @@unique(fields: [userId, name])
  @@map("entities")
}

enum EntityType {
  Entity
  Account
}

model Payment {
  id         Int       @id @default(autoincrement())
  userId     String    @map("user_id")
  user       User      @relation(fields: [userId], references: [id])
  amount     Int
  currency   String    @default("EUR")
  date       DateTime  @default(now())
  payor      Entity    @relation("PayorEntity", fields: [payorId], references: [id])
  payorId    Int       @map("payor_id")
  payee      Entity    @relation("PayeeEntity", fields: [payeeId], references: [id])
  payeeId    Int       @map("payee_id")
  note       String?
  category   Category? @relation(fields: [categoryId], references: [id])
  categoryId Int?      @map("category_id")
  createdAt  DateTime  @default(now()) @map("created_at")
  updatedAt  DateTime  @updatedAt @map("updated_at")

  @@map("payments")
}

model Category {
  id        Int      @id @default(autoincrement())
  userId    String   @map("user_id")
  user      User     @relation(fields: [userId], references: [id])
  name      String
  color     String
  createdAt DateTime @default(now()) @map("created_at")
  updatedAt DateTime @updatedAt @map("updated_at")

  payments Payment[]
  Entity   Entity[]

  @@unique(fields: [userId, name])
  @@map("categories")
}