// prisma/schema.prisma
generator client {
  provider      = "prisma-client-js"
  binaryTargets = ["native", "debian-openssl-3.0.x"]
}

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

enum IncomeFrequency {
  weekly
  biweekly
  monthly
}

enum IncomeType {
  regular
  irregular
}

model User {
  id           String   @id @default(uuid())
  email        String   @unique
  passwordHash String?
  displayName  String?
  createdAt    DateTime @default(now())
  updatedAt    DateTime @updatedAt

  incomeFrequency   IncomeFrequency @default(biweekly)
  incomeType        IncomeType      @default(regular)
  firstIncomeDate   DateTime?       // Track when user's first income was received for accurate pay period calculation
  pendingScheduledIncome Boolean    @default(false) // Flag set when user dismisses payday overlay, cleared when paycheck is entered
  timezone          String          @default("America/New_York") // IANA timezone identifier for accurate date calculations
  fixedExpensePercentage Int        @default(40) // Irregular income: percent of new income to auto-fund fixed expenses
  totalBudgetCents  BigInt?
  budgetPeriod      String          @default("monthly")

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

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)
  savingsTargetCents BigInt?
  transactions Transaction[] @relation("TransactionCategory")

  @@unique([userId, name])
  @@index([userId, priority])
}

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)
  currentFundedCents BigInt @default(0)
  priority     Int      @default(100)
  fundingMode  String   @default("auto-on-deposit")
  scheduleJson Json?
  periodDays   Int      @default(30)
  frequency    String?  // "one-time", "weekly", "biweekly", "monthly"
  autoRollover Boolean  @default(true)
  lastRollover DateTime?
  lastFundingDate DateTime?
  lastFundedPayPeriod DateTime? // Track when plan was last funded in a pay period
  needsFundingThisPeriod Boolean @default(true) // Simple flag to track funding needs
  
  // Auto-payment fields
  autoPayEnabled    Boolean  @default(false)
  paymentSchedule   Json?    // { frequency: "monthly", dayOfMonth: 1, minFundingPercent: 100 }
  nextPaymentDate   DateTime?
  lastAutoPayment   DateTime?
  maxRetryAttempts  Int      @default(3)
  
  // Overdue tracking fields
  isOverdue         Boolean  @default(false)
  overdueAmount     BigInt   @default(0)
  overdueSince      DateTime?
  
  transactions  Transaction[] @relation("TransactionPlan")

  @@unique([userId, name])
  @@index([userId, dueOn])
  @@index([userId, priority])
}

model IncomeEvent {
  id          String       @id @default(uuid())
  userId      String
  user        User         @relation(fields: [userId], references: [id], onDelete: Cascade)
  postedAt    DateTime
  amountCents BigInt
  note        String?
  isScheduledIncome Boolean @default(false) // True if this is a regular paycheck (vs bonus/extra income)
  allocations Allocation[]

  @@index([userId, postedAt])
}

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

model Transaction {
  id          String   @id @default(uuid())
  userId      String
  user        User     @relation(fields: [userId], references: [id], onDelete: Cascade)
  occurredAt  DateTime
  kind        String
  categoryId  String?
  category    VariableCategory? @relation("TransactionCategory", fields: [categoryId], references: [id], onDelete: SetNull)
  planId      String?
  plan        FixedPlan? @relation("TransactionPlan", fields: [planId], references: [id], onDelete: SetNull)
  amountCents BigInt
  note        String?
  receiptUrl  String?
  isAutoPayment Boolean @default(false)
  isReconciled Boolean @default(false)

  @@index([userId, occurredAt])
}

model BudgetSession {
  id                 String   @id @default(uuid())
  userId             String
  user               User     @relation(fields: [userId], references: [id], onDelete: Cascade)
  periodStart        DateTime
  periodEnd          DateTime
  totalBudgetCents   BigInt
  allocatedCents     BigInt   @default(0)
  fundedCents        BigInt   @default(0)
  availableCents     BigInt   @default(0)
  createdAt          DateTime @default(now())
  updatedAt          DateTime @updatedAt

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