// Boka Gasol247 — Prisma schema
// SQLite for MVP. Migrating to Postgres later: change provider + DATABASE_URL.

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

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

// Singleton settings row. Always accessed with id = "singleton" so we never
// have more than one row. Add new fields as feature flags grow.
model Settings {
  id             String   @id @default("singleton")
  pickupEnabled  Boolean  @default(true)
  updatedAt      DateTime @updatedAt
}

model Admin {
  id           String   @id @default(cuid())
  email        String   @unique
  name         String
  passwordHash String
  createdAt    DateTime @default(now())
  updatedAt    DateTime @updatedAt
}

model Product {
  id            String        @id @default(cuid())
  sku           String        @unique
  nameSv        String
  nameEn        String
  descriptionSv String
  descriptionEn String
  // Price in öre (SEK * 100) to avoid float issues.
  priceOre      Int
  // VAT in basis points (e.g. 2500 = 25.00%).
  vatBp         Int           @default(2500)
  active        Boolean       @default(true)
  sortOrder     Int           @default(0)
  createdAt     DateTime      @default(now())
  updatedAt     DateTime      @updatedAt
  bookingItems  BookingItem[]
}

model PickupSlot {
  id           String               @id @default(cuid())
  // Human label fallback (e.g. "Måndag förmiddag").
  labelSv      String
  labelEn      String
  startsAt     DateTime
  endsAt       DateTime
  capacity     Int                  @default(50)
  active       Boolean              @default(true)
  bookings     Booking[]
  replacements ReplacementRequest[]
  createdAt    DateTime             @default(now())
  updatedAt    DateTime             @updatedAt
}

// BookingStatus values (string, since SQLite has no enums):
//   PENDING | CONFIRMED
//   DELIVERED_PARTIAL | DELIVERED              (handout out, none returned)
//   RETURNED_PARTIAL  | RETURNED               (everything has come back)
//   INVOICED          (billing done, terminal)
//   CANCELLED         (terminal)
// Derived statuses (DELIVERED*/RETURNED*) are normally auto-set from item
// counters; INVOICED and CANCELLED are set explicitly by admin.
model Booking {
  id            String        @id @default(cuid())
  bookingNumber String        @unique
  status        String        @default("CONFIRMED")

  // Contact
  contactName   String
  email         String
  phone         String

  // Organization
  orgName       String
  orgNumber     String

  // Invoice address
  address       String
  postalCode    String
  city          String
  country       String        @default("SE")

  // Pickup
  pickupSlotId  String?
  pickupSlot    PickupSlot?   @relation(fields: [pickupSlotId], references: [id])

  replacements  ReplacementRequest[]

  notes         String?

  // Snapshots in öre at booking time
  subtotalOre   Int
  vatOre        Int
  totalOre      Int

  locale        String        @default("sv")

  items         BookingItem[]

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

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

model BookingItem {
  id          String  @id @default(cuid())
  bookingId   String
  booking     Booking @relation(fields: [bookingId], references: [id], onDelete: Cascade)
  productId   String
  product     Product @relation(fields: [productId], references: [id])

  // Snapshots so historical bookings don't break if a product changes
  sku         String
  nameSv      String
  nameEn      String
  unitPriceOre Int
  vatBp       Int
  quantity    Int
  lineTotalOre Int

  // Fulfillment tracking — set by admin as cylinders go out and come back.
  // Invariants: 0 <= deliveredQuantity <= quantity
  //             0 <= returnedQuantity  <= deliveredQuantity
  deliveredQuantity Int @default(0)
  returnedQuantity  Int @default(0)

  replacements ReplacementRequest[]

  @@index([bookingId])
}

// Customer-side magic-link tokens. Raw token lives only in the email;
// DB stores SHA-256 hash. Single-use + 1h expiry.
model CustomerMagicLink {
  id        String    @id @default(cuid())
  tokenHash String    @unique
  email     String
  expiresAt DateTime
  usedAt    DateTime?
  createdAt DateTime  @default(now())

  @@index([email])
  @@index([expiresAt])
}

// Customer-side browser sessions, cookie value is hashed before storage.
// Email is the identity — magic link gives access to all bookings with this email.
model CustomerSession {
  id        String   @id @default(cuid())
  tokenHash String   @unique
  email     String
  expiresAt DateTime
  createdAt DateTime @default(now())

  @@index([email])
  @@index([expiresAt])
}

// ReplacementRequest values for status (string, SQLite has no enums):
//   REQUESTED   — customer just asked
//   SCHEDULED   — admin assigned a slot / confirmed
//   DELIVERED   — exchange done
//   CANCELLED   — terminal
model ReplacementRequest {
  id            String      @id @default(cuid())
  bookingId     String
  booking       Booking     @relation(fields: [bookingId], references: [id])
  bookingItemId String
  bookingItem   BookingItem @relation(fields: [bookingItemId], references: [id])

  quantity      Int
  notes         String?

  // Price snapshot at request time — a swap is its own sale (full cylinder
  // price). Snapshotted so future Product price changes don't rewrite history.
  sku           String
  nameSv        String
  nameEn        String
  unitPriceOre  Int
  vatBp         Int
  lineTotalOre  Int

  // Pickup slot chosen by the customer (optional — admin can override)
  pickupSlotId  String?
  pickupSlot    PickupSlot? @relation(fields: [pickupSlotId], references: [id])

  status        String      @default("REQUESTED")

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

  @@index([bookingId])
  @@index([status])
  @@index([createdAt])
}