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

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

model Venue {
  id        String   @id @default(uuid())
  name      String
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  devices          Device[]
  clientUsers      ClientUser[]
  tabOwnerships    TabOwnership[]
  remoteCommands   RemoteCommand[]
  auditLogs        AuditLog[]
  regCodes         RegistrationCode[]
  plannedTabs      PlannedTab[]
  tabReminders     TabReminder[]
  tabEvents        TabEvent[]
  products         Product[]
  stockAdjustments StockAdjustment[]
}

model Device {
  id             String    @id @default(uuid())
  venueId        String    @unique
  name           String
  tokenHash      String    @unique
  tokenPrefix    String
  tokenExpiresAt DateTime
  lastSeenAt     DateTime  @default(now())
  revokedAt      DateTime?
  createdAt      DateTime  @default(now())

  venue          Venue             @relation(fields: [venueId], references: [id])
  tabSnapshots   OpenTabSnapshot[]
  tabOwnerships  TabOwnership[]
  remoteCommands RemoteCommand[]
  tabEvents      TabEvent[]

  @@index([venueId, revokedAt])
}

model ClientUser {
  id           String   @id @default(uuid())
  venueId      String
  email        String   @unique
  passwordHash String
  name         String
  role         String   @default("viewer")
  createdAt    DateTime @default(now())

  venue Venue @relation(fields: [venueId], references: [id])

  @@index([venueId])
}

model RegistrationCode {
  id        String    @id @default(uuid())
  venueId   String
  code      String    @unique
  expiresAt DateTime
  usedAt    DateTime?
  createdAt DateTime  @default(now())

  venue Venue @relation(fields: [venueId], references: [id])

  @@index([venueId])
}

model OpenTabSnapshot {
  id           String   @id @default(uuid())
  deviceId     String
  tabId        String
  customerName String
  version      Int
  totalInCents Int
  itemCount    Int
  // The tab's lines as reported by the terminal: [{ productName, quantity, unitPriceInCents }].
  // Null for terminals running an app version that doesn't report them.
  items        Json?
  reportedAt   DateTime

  device Device @relation(fields: [deviceId], references: [id])

  @@unique([deviceId, tabId])
  @@index([deviceId])
  @@index([tabId, reportedAt])
}

model TabOwnership {
  tabId          String
  venueId        String
  deviceId       String
  lastReportedAt DateTime

  venue  Venue  @relation(fields: [venueId], references: [id])
  device Device @relation(fields: [deviceId], references: [id])

  @@id([venueId, tabId])
}

model RemoteCommand {
  id              String    @id @default(uuid())
  venueId         String
  deviceId        String
  targetTabId     String
  customerName    String?
  amountInCents   Int?
  type            String    @default("close_tab")
  expectedVersion Int
  paymentMethod   String
  requestedBy     String
  status          String    @default("pending")
  result          String?
  acknowledgedAt  DateTime?
  createdAt       DateTime  @default(now())
  expiresAt       DateTime

  venue  Venue  @relation(fields: [venueId], references: [id])
  device Device @relation(fields: [deviceId], references: [id])

  @@index([deviceId, status, createdAt])
  @@index([venueId, status, createdAt])
}

model AuditLog {
  id        String   @id @default(uuid())
  venueId   String
  actorType String
  actorId   String
  action    String
  details   String?
  createdAt DateTime @default(now())

  venue Venue @relation(fields: [venueId], references: [id])

  @@index([venueId, createdAt])
}

model RefreshToken {
  id        String    @id @default(uuid())
  userId    String
  tokenHash String    @unique
  expiresAt DateTime
  revokedAt DateTime?
  createdAt DateTime  @default(now())

  @@index([userId])
}

model PlannedTab {
  id              String    @id @default(uuid())
  venueId         String
  customerName    String
  // Lowercased, whitespace-collapsed name: customers are matched on this everywhere
  customerNameKey String
  email           String?
  position        Int       @default(0)
  createdAt       DateTime  @default(now())
  // Set once the terminal reports an open tab with this name; it is then no longer sent to devices
  deliveredAt     DateTime?

  venue Venue @relation(fields: [venueId], references: [id])

  @@unique([venueId, customerNameKey])
  @@index([venueId])
}

model TabReminder {
  id            String   @id @default(uuid())
  venueId       String
  tabId         String
  customerName  String
  email         String
  amountInCents Int
  sentAt        DateTime @default(now())
  status        String   @default("sent")

  venue Venue @relation(fields: [venueId], references: [id])

  @@index([venueId, sentAt])
  @@index([venueId, tabId])
}

// What happened on a tab, as reported by the terminal: lines added or removed, and settlements.
// The id is generated by the terminal so a re-sent event is stored only once.
model TabEvent {
  id               String   @id
  venueId          String
  deviceId         String
  tabId            String
  customerName     String
  // line_added | line_removed | settled
  type             String
  productName      String?
  unitPriceInCents Int?
  // Signed: positive for line_added, negative for line_removed
  quantityDelta    Int?
  // settled only
  amountInCents    Int?
  paymentMethod    String?
  commandId        String?
  items            Json?
  occurredAt       DateTime
  receivedAt       DateTime @default(now())

  venue  Venue  @relation(fields: [venueId], references: [id])
  device Device @relation(fields: [deviceId], references: [id])

  @@index([venueId, occurredAt])
  @@index([venueId, type, occurredAt])
}

// The terminal's product catalog with its stock, as last reported by the terminal. The terminal owns the
// stock: it counts sales down offline, so the dashboard only changes it through StockAdjustments.
model Product {
  venueId           String
  // Generated by the terminal
  productId         String
  name              String
  category          String?
  priceInCents      Int
  // Null when the terminal doesn't track stock for this product. Can be negative: a sale is never blocked.
  stock             Int?
  // Dashboard-only setting, never sent to or overwritten by the terminal
  lowStockThreshold Int?
  reportedAt        DateTime

  venue Venue @relation(fields: [venueId], references: [id])

  @@id([venueId, productId])
}

// A stock change requested from the dashboard. It is sent to the terminal on every sync until the terminal
// reports it applied or rejected.
model StockAdjustment {
  id            String    @id @default(uuid())
  venueId       String
  productId     String
  productName   String
  // add (signed: a delivery, or breakage when negative) | set (a stock count)
  type          String
  quantity      Int
  note          String?
  requestedBy   String
  requestedById String
  // pending | applied | rejected | cancelled
  status        String    @default("pending")
  // The terminal's stock right after applying it
  stockAfter    Int?
  result        String?
  createdAt     DateTime  @default(now())
  processedAt   DateTime?

  venue Venue @relation(fields: [venueId], references: [id])

  @@index([venueId, status, createdAt])
  @@index([venueId, productId, createdAt])
}