// Gold Banking System — core schema
// Canonical accounting model: legacy "System A" gram ledger (see migration notes).
// The external "Tahesab" service is retired — LedgerEntry is the sole source of truth.
// All money/weight fields use Decimal, never Float, to avoid rounding drift in debt math.

generator client {
  provider      = "prisma-client-js"
  // native = local Windows/macOS build; linux-musl = Arvan/Alpine Docker runtime
  binaryTargets = ["native", "linux-musl-openssl-3.0.x"]
}

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

// ─────────────────────────────────────────────────────────────────────────
// Enums
// ─────────────────────────────────────────────────────────────────────────

enum AdminRole {
  SUPER_ADMIN
  SYSTEM_APPROVER // legacy: تایید مدیر سیستم
  SALES_EXPERT // legacy Customer.type=1, also acts as a referral "reagent"
  WORKSHOP_SUPERVISOR
  ACCOUNTANT
}

enum VerificationStep {
  UNVERIFIED
  STEP_ONE_SUBMITTED
  STEP_TWO_SUBMITTED
  VERIFIED
}

enum OrderStatus {
  SUSPENDED // credit limit (goldCreditLimitGrams) exceeded at placement
  PLACED
  ADMIN_APPROVED
  SOURCING
  PREPARING
  DELIVERED_TO_AGENT
  DELIVERED_TO_CUSTOMER // debt recognition point — mirrors legacy sts>4
  CANCELLED
}

enum PreOrderStatus {
  PLACED
  ADMIN_APPROVED
  WORKSHOP_APPROVED
  READY_TO_SHIP
  DELIVERED
  CANCELLED
}

enum LedgerCurrency {
  GOLD_GRAM
  RIAL
}

enum LedgerDirection {
  DEBIT // increases what the customer owes
  CREDIT // decreases what the customer owes
}

enum LedgerSourceType {
  ORDER_STOCK
  ORDER_PRE_ORDER
  REPAYMENT_MELTED_GOLD // karat-normalized: amount * karatPerMille / 750
  REPAYMENT_TRANSFER
  REPAYMENT_CHEQUE
  REPAYMENT_CASH // price-per-gram-normalized via pricePerGramRialAtEntry
  WALLET_BONUS
  ADJUSTMENT
}

// ─────────────────────────────────────────────────────────────────────────
// Identity
// ─────────────────────────────────────────────────────────────────────────

model City {
  id        String            @id @default(cuid())
  name      String
  province  String?
  customers Customer[]
  addresses CustomerAddress[]
  branches  Branch[]
  preOrders PreOrder[]
}

model AdminUser {
  id           String    @id @default(cuid())
  fullName     String
  mobile       String    @unique
  passwordHash String
  role         AdminRole
  branchId     String?
  branch       Branch?   @relation(fields: [branchId], references: [id])
  wagePercent  Decimal?  @db.Decimal(6, 3) // legacy Customer.percent, commission on referred orders
  isActive     Boolean   @default(true)
  createdAt    DateTime  @default(now())

  referredCustomers    Customer[]            @relation("ReferralAgent")
  postedLedgerEntries  LedgerEntry[]
  orderStatusEvents    OrderStatusEvent[]
  preOrderStatusEvents PreOrderStatusEvent[]

  @@index([role])
}

model Customer {
  id           String  @id @default(cuid())
  fullName     String
  mobile       String  @unique
  nationalCode String  @unique
  passwordHash String
  cityId       String?
  city         City?   @relation(fields: [cityId], references: [id])

  referredByAgentId String?
  referredByAgent   AdminUser? @relation("ReferralAgent", fields: [referredByAgentId], references: [id])

  // Credit limit + cached ledger balances (source of truth is LedgerEntry; these
  // are denormalized for fast reads and reconciled by a scheduled job).
  goldCreditLimitGrams Decimal @default(0) @db.Decimal(14, 4) // legacy gram_level
  goldDebtGrams        Decimal @default(0) @db.Decimal(14, 4) // legacy remain
  fiatDebtRial         Decimal @default(0) @db.Decimal(20, 2) // legacy rial_remain

  verificationStep   VerificationStep @default(UNVERIFIED)
  nationalIdImageUrl String?
  businessLicenseUrl String?
  shopImageUrl       String?

  isActive  Boolean  @default(true)
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  addresses     CustomerAddress[]
  orders        Order[]
  preOrders     PreOrder[]
  ledgerEntries LedgerEntry[]
  walletBonuses WalletBonus[]

  @@index([referredByAgentId])
}

model CustomerAddress {
  id          String   @id @default(cuid())
  customerId  String
  customer    Customer @relation(fields: [customerId], references: [id])
  cityId      String?
  city        City?    @relation(fields: [cityId], references: [id])
  addressLine String
  isDefault   Boolean  @default(false)
}

model Branch {
  id         String      @id @default(cuid())
  name       String
  cityId     String?
  city       City?       @relation(fields: [cityId], references: [id])
  adminUsers AdminUser[]
  orders     Order[]
}

model Workshop {
  id        String     @id @default(cuid())
  name      String
  isActive  Boolean    @default(true)
  preOrders PreOrder[]
}

// ─────────────────────────────────────────────────────────────────────────
// Catalog — item reference catalog
// ─────────────────────────────────────────────────────────────────────────

model Category {
  id       String     @id @default(cuid())
  title    String
  parentId String?
  parent   Category?  @relation("CategoryTree", fields: [parentId], references: [id])
  children Category[] @relation("CategoryTree")
  products Product[]
}

model Brand {
  id       String    @id @default(cuid())
  title    String
  products Product[]
}

/// Curated product groupings — replaces legacy "Ciny/CinyProduct" (a tagging
/// feature, NOT a gold-price snapshot mechanism, despite the misleading legacy name).
model Collection {
  id          String              @id @default(cuid())
  title       String
  description String?
  isActive    Boolean             @default(true)
  products    CollectionProduct[]
}

model CollectionProduct {
  collectionId String
  collection   Collection @relation(fields: [collectionId], references: [id])
  productId    String
  product      Product    @relation(fields: [productId], references: [id])

  @@id([collectionId, productId])
}

model Product {
  id          String    @id @default(cuid())
  title       String
  description String?
  categoryId  String?
  category    Category? @relation(fields: [categoryId], references: [id])
  brandId     String?
  brand       Brand?    @relation(fields: [brandId], references: [id])
  isActive    Boolean   @default(true)
  createdAt   DateTime  @default(now())

  variants    ProductVariant[]
  images      ProductImage[]
  collections CollectionProduct[]
}

model ProductImage {
  id        String  @id @default(cuid())
  productId String
  product   Product @relation(fields: [productId], references: [id])
  url       String
  sortOrder Int     @default(0)
}

model ProductVariant {
  id                 String  @id @default(cuid())
  productId          String
  product            Product @relation(fields: [productId], references: [id])
  title              String
  sku                String? @unique
  /// Base/raw weight before making charge ("rash weight").
  rashWeightGrams    Decimal @db.Decimal(14, 4)
  /// Default making-charge percentage applied on top of rash weight.
  defaultWagePercent Decimal @db.Decimal(6, 3)
  isActive           Boolean @default(true)

  orderItems OrderItem[]
}

// ─────────────────────────────────────────────────────────────────────────
// Orders — stock orders (debt-bearing)
// ─────────────────────────────────────────────────────────────────────────

model Order {
  id          String      @id @default(cuid())
  orderNumber String      @unique
  customerId  String
  customer    Customer    @relation(fields: [customerId], references: [id])
  branchId    String?
  branch      Branch?     @relation(fields: [branchId], references: [id])
  status      OrderStatus @default(PLACED)

  /// Total gold weight incl. wage across all items ("allGram" / order.w).
  totalGoldWeightGrams Decimal @db.Decimal(14, 4)
  /// Pure making-charge weight component (totalGoldWeightGrams minus raw weight sum).
  wageWeightGrams      Decimal @db.Decimal(14, 4)
  /// Flat Rial charge independent of gold price (e.g. stones) — legacy rial_input.
  flatRialCharge       Decimal @default(0) @db.Decimal(20, 2)

  isSuspendedOverCreditLimit Boolean   @default(false)
  deliveredAt                DateTime? // setting this is what triggers debt recognition

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

  items                 OrderItem[]
  statusEvents          OrderStatusEvent[]
  ledgerEntries         LedgerEntry[]
  convertedFromPreOrder PreOrder?

  @@index([customerId])
  @@index([status])
}

model OrderItem {
  id               String         @id @default(cuid())
  orderId          String
  order            Order          @relation(fields: [orderId], references: [id])
  productVariantId String
  productVariant   ProductVariant @relation(fields: [productVariantId], references: [id])
  quantity         Int

  // Snapshots at order time — never re-read from ProductVariant after placement.
  rashWeightGramsSnapshot Decimal @db.Decimal(14, 4)
  wagePercentSnapshot     Decimal @db.Decimal(6, 3)
  discountPercentSnapshot Decimal @default(0) @db.Decimal(6, 3)
  /// computed: rash*(1 + (wagePercent-discount)/100)
  computedWeightGrams     Decimal @db.Decimal(14, 4)
  flatRialCharge          Decimal @default(0) @db.Decimal(20, 2)
}

model OrderStatusEvent {
  id               String       @id @default(cuid())
  orderId          String
  order            Order        @relation(fields: [orderId], references: [id])
  fromStatus       OrderStatus?
  toStatus         OrderStatus
  note             String?
  actorAdminUserId String?
  actorAdminUser   AdminUser?   @relation(fields: [actorAdminUserId], references: [id])
  createdAt        DateTime     @default(now())

  @@index([orderId])
}

// ─────────────────────────────────────────────────────────────────────────
// Pre-orders — custom manufacturing requests (not debt-bearing until converted)
// ─────────────────────────────────────────────────────────────────────────

model PreOrder {
  id         String         @id @default(cuid())
  customerId String
  customer   Customer       @relation(fields: [customerId], references: [id])
  cityId     String?
  city       City?          @relation(fields: [cityId], references: [id])
  workshopId String?
  workshop   Workshop?      @relation(fields: [workshopId], references: [id])
  status     PreOrderStatus @default(PLACED)

  designImageUrl       String?
  colorName            String?
  sizeSpec             String?
  stoneColor           String?
  minaColor            String?
  estimatedWeightGrams Decimal? @db.Decimal(14, 4)
  estimatedPriceRial   Decimal? @db.Decimal(20, 2)
  description          String?

  /// Once priced, an admin converts this into a real (debt-bearing) Order.
  convertedOrderId String? @unique
  convertedOrder   Order?  @relation(fields: [convertedOrderId], references: [id])

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

  statusEvents PreOrderStatusEvent[]

  @@index([customerId])
}

model PreOrderStatusEvent {
  id               String     @id @default(cuid())
  preOrderId       String
  preOrder         PreOrder   @relation(fields: [preOrderId], references: [id])
  /// Field-level diff, e.g. {"status": {"old": "PLACED", "new": "ADMIN_APPROVED"}}
  changes          Json
  actorAdminUserId String?
  actorAdminUser   AdminUser? @relation(fields: [actorAdminUserId], references: [id])
  ipAddress        String?
  createdAt        DateTime   @default(now())

  @@index([preOrderId])
}

// ─────────────────────────────────────────────────────────────────────────
// Accounting — the dual-currency ledger (core of the system)
// ─────────────────────────────────────────────────────────────────────────

model LedgerEntry {
  id         String   @id @default(cuid())
  customerId String
  customer   Customer @relation(fields: [customerId], references: [id])

  currency   LedgerCurrency
  direction  LedgerDirection
  sourceType LedgerSourceType
  /// Always positive; direction determines the sign applied to the customer balance.
  amount     Decimal          @db.Decimal(20, 4)

  /// Purity of the physical instrument, for REPAYMENT_MELTED_GOLD (e.g. 750, 916).
  karatPerMille           Int?
  /// Gold price/gram at conversion time, for REPAYMENT_CASH.
  pricePerGramRialAtEntry Decimal? @db.Decimal(20, 2)

  orderId String?
  order   Order?  @relation(fields: [orderId], references: [id])

  /// Pending entries don't count toward the cached customer balance until confirmed.
  confirmed           Boolean    @default(false)
  confirmedAt         DateTime?
  postedByAdminUserId String?
  postedByAdminUser   AdminUser? @relation(fields: [postedByAdminUserId], references: [id])

  note      String?
  createdAt DateTime @default(now())

  @@index([customerId, currency])
  @@index([orderId])
}

/// Replaces legacy WebServiceGold / ConfigStatic.gold_price — timestamped price feed.
model GoldPriceQuote {
  id               String   @id @default(cuid())
  karatPerMille    Int
  pricePerGramRial Decimal  @db.Decimal(20, 2)
  source           String
  quotedAt         DateTime @default(now())

  @@index([karatPerMille, quotedAt])
}

/// Time-limited gold cashback bonus — replaces the legacy Rooyesh\Wallet gold credit.
model WalletBonus {
  id         String    @id @default(cuid())
  customerId String
  customer   Customer  @relation(fields: [customerId], references: [id])
  orderId    String?
  goldGrams  Decimal   @db.Decimal(14, 4)
  grantedAt  DateTime  @default(now())
  expiresAt  DateTime
  consumedAt DateTime?
  isActive   Boolean   @default(true)

  @@index([customerId, isActive])
}