// prisma/schema.prisma 
generator client { provider = "prisma-client-js" }
datasource db { provider = "postgresql"; url = env("DATABASE_URL") }

model User {
  id        String   @id @default(uuid())
  email     String   @unique
  createdAt DateTime @default(now())

  variableCategories VariableCategory[]
  fixedPlans         FixedPlan[]
  incomes            IncomeEvent[]
  allocations        Allocation[]
  transactions       Transaction[]
}

model VariableCategory {
  id           String  @id @default(uuid())
  userId       String
  user         User    @relation(fields: [userId], references: [id], onDelete: Cascade)
  name         String
  percent      Int
  priority     Int     @default(100)
  isSavings    Boolean @default(false)
  balanceCents BigInt  @default(0)

  @@unique([userId, name])
  @@check(percent_gte_0,  "percent >= 0")
  @@check(percent_lte_100,"percent <= 100")
}

model FixedPlan {
  id          String  @id @default(uuid())
  userId      String
  user        User    @relation(fields: [userId], references: [id], onDelete: Cascade)
  name        String
  cycleStart  DateTime
  dueOn       DateTime
  totalCents  BigInt
  fundedCents BigInt  @default(0)
  priority    Int     @default(100)
  fundingMode String  @default("auto-on-deposit") // or 'by-schedule'
  scheduleJson Json?

  @@unique([userId, name])
  @@check(total_nonneg,     "totalCents >= 0")
  @@check(funded_nonneg,    "fundedCents >= 0")
}

model IncomeEvent {
  id          String   @id @default(uuid())
  userId      String
  user        User     @relation(fields: [userId], references: [id], onDelete: Cascade)
  postedAt    DateTime
  amountCents BigInt

  allocations Allocation[]

  @@check(pos_amount, "amountCents > 0")
}

model Allocation {
  id          String   @id @default(uuid())
  userId      String
  user        User     @relation(fields: [userId], references: [id], onDelete: Cascade)
  createdAt   DateTime @default(now())
  kind        String   // 'savings' | 'variable' | 'fixed'
  toId        String
  amountCents BigInt
  incomeId    String?
  income      IncomeEvent? @relation(fields: [incomeId], references: [id])

  @@check(pos_amount, "amountCents > 0")
}

model Transaction {
  id           String   @id @default(uuid())
  userId       String
  user         User     @relation(fields: [userId], references: [id], onDelete: Cascade)
  occurredAt   DateTime
  kind         String   // 'variable-spend' | 'fixed-payment'
  categoryId   String?
  planId       String?
  amountCents  BigInt

  @@check(pos_amount, "amountCents > 0")
}