// Hosted T4T Gateway — Prisma schema.
//
// One operator wallet handles all on-chain transactions. Tenants are off-chain
// ledger entries denominated in xBZZ wei (Decimal(78, 0) holds any uint256).
// USD is never in the billing path — only in `Topup` rows for Phase 2 Stripe.

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

// Connection URL + seed config live in prisma.config.ts (Prisma 7).
datasource db {
  provider = "postgresql"
}

// -----------------------------------------------------------------------------
// Enums
// -----------------------------------------------------------------------------

enum UserRole {
  USER
  ADMIN
}

enum AuthProvider {
  google
  email
}

enum AccountStatus {
  active
  disabled
}

enum LedgerKind {
  welcomeGrant
  settle
  refund
  topup
  adjustment
}

enum GatewayJobStatus {
  posted
  acked
  delivered
  claimed
  cancelled
  timed_out
  failed
}

enum TopupStatus {
  requires_payment
  processing
  succeeded
  credited
  failed
  refunded
}

// -----------------------------------------------------------------------------
// User + auth
// -----------------------------------------------------------------------------

model User {
  id                String        @id @default(uuid())
  createdAt         DateTime      @default(now())
  updatedAt         DateTime      @updatedAt
  email             String        @unique
  emailVerified     Boolean       @default(false)
  // Single-use email verification token (NULL once consumed). For Phase 1 we
  // surface this in the signup response in dev/test mode; Phase 1.5 wires up
  // a real outbound mailer and stops echoing the token back.
  verificationToken String?       @unique
  authProvider      AuthProvider
  googleSub         String?       @unique
  passwordHash      String?
  role              UserRole      @default(USER)

  // Phase 2 — Stripe handles billing address + sanctions screening
  stripeCustomerId String?    @unique
  country          String?    // ISO 3166-1 alpha-2, mirrored from Stripe

  account       Account?
  apiKeys       ApiKey[]
  gatewayJobs   GatewayJob[]
  topups        Topup[]

  @@index([authProvider, googleSub])
}

model ApiKey {
  id                 String   @id @default(uuid())
  createdAt          DateTime @default(now())
  key                String   @unique @default(uuid())
  name               String   @default("")
  lastUsedAt         DateTime?
  scopeMaxXbzzPerDay Decimal? @db.Decimal(78, 0)
  modelAllowlist     String[] @default([])

  user   User   @relation(fields: [userId], references: [id], onDelete: Cascade)
  userId String

  @@index([userId])
}

// -----------------------------------------------------------------------------
// Account + ledger
// -----------------------------------------------------------------------------

model Account {
  id              String         @id @default(uuid())
  createdAt       DateTime       @default(now())
  updatedAt       DateTime       @updatedAt
  status          AccountStatus  @default(active)
  balanceXbzzWei  Decimal        @default(0) @db.Decimal(78, 0)
  reservedXbzzWei Decimal        @default(0) @db.Decimal(78, 0)

  user   User   @relation(fields: [userId], references: [id], onDelete: Cascade)
  userId String @unique

  ledgerEntries LedgerEntry[]
}

model LedgerEntry {
  id              String     @id @default(uuid())
  createdAt       DateTime   @default(now())
  kind            LedgerKind
  deltaXbzzWei    Decimal    @db.Decimal(78, 0)
  idempotencyKey  String     @unique
  note            String?

  account     Account     @relation(fields: [accountId], references: [id], onDelete: Cascade)
  accountId   String

  gatewayJob  GatewayJob? @relation(fields: [gatewayJobId], references: [id], onDelete: SetNull)
  gatewayJobId String?

  topup       Topup?      @relation(fields: [topupId], references: [id], onDelete: SetNull)
  topupId     String?

  @@index([accountId, createdAt(sort: Desc)])
  @@index([kind])
}

// -----------------------------------------------------------------------------
// Gateway jobs (per-chat-completion, settled on JobClaimed)
// -----------------------------------------------------------------------------

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

  // Routing
  routingId            String           @unique  // local routing id (keccak of request hash etc.)
  onChainJobId         String?          @unique  // bytes32 from JobEscrow.JobPosted
  requestHash          String?                   // Swarm chunk ref of encrypted request
  responseHash         String?                   // Swarm chunk ref of encrypted response

  // Counterparties / model
  provider             String                     // 0x address selected by the gateway
  modelId              String

  // Billing (xBZZ-denominated; markup baked in)
  estimatedMaxXbzzWei  Decimal          @db.Decimal(78, 0)
  actualXbzzWei        Decimal?         @db.Decimal(78, 0)

  // Lifecycle
  status               GatewayJobStatus @default(posted)
  postedAt             DateTime         @default(now())
  ackedAt              DateTime?
  deliveredAt          DateTime?
  claimedAt            DateTime?
  ackDeadline          DateTime?
  deliveryDeadline     DateTime?

  // Token accounting (from JobClaimed actualPayment)
  promptTokens         Int?
  completionTokens     Int?

  // Optional payload retention (off by default; T4T_PERSIST_PAYLOADS-style)
  promptRedacted       String?
  responseRedacted     String?
  errorMessage         String?

  user                 User             @relation(fields: [userId], references: [id], onDelete: Cascade)
  userId               String

  ledgerEntries        LedgerEntry[]

  @@index([userId, createdAt(sort: Desc)])
  @@index([status])
  @@index([onChainJobId])
}

// -----------------------------------------------------------------------------
// Stripe top-ups (Phase 2)
// -----------------------------------------------------------------------------

model Topup {
  id                  String      @id @default(uuid())
  createdAt           DateTime    @default(now())
  updatedAt           DateTime    @updatedAt
  status              TopupStatus @default(requires_payment)

  stripePaymentIntent String      @unique
  amountUsdCents      Int

  creditedXbzzWei     Decimal?    @db.Decimal(78, 0)
  usdPerXbzzAtCredit  Decimal?    @db.Decimal(18, 8)

  error               String?

  user   User   @relation(fields: [userId], references: [id], onDelete: Cascade)
  userId String

  ledgerEntries LedgerEntry[]

  @@index([userId, createdAt(sort: Desc)])
  @@index([status])
}