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

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

// ─── Auth (NextAuth v5) ────────────────────────────────────────────────────

model User {
  id            String    @id @default(cuid())
  name          String?
  email         String    @unique
  emailVerified DateTime?
  image         String?
  role          Role      @default(CUSTOMER)
  password      String?

  accounts Account[]
  sessions Session[]
  orders   Order[]

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

model Account {
  id                String  @id @default(cuid())
  userId            String
  type              String
  provider          String
  providerAccountId String
  refresh_token     String?
  access_token      String?
  expires_at        Int?
  token_type        String?
  scope             String?
  id_token          String?
  session_state     String?

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

  @@unique([provider, providerAccountId])
}

model Session {
  id           String   @id @default(cuid())
  sessionToken String   @unique
  userId       String
  expires      DateTime

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

model VerificationToken {
  identifier String
  token      String
  expires    DateTime

  @@unique([identifier, token])
}

enum Role {
  CUSTOMER
  ADMIN
}

// ─── Katalog ──────────────────────────────────────────────────────────────

model Category {
  id          String    @id @default(cuid())
  name        String
  slug        String    @unique
  description String?
  image       String?
  products    Product[]

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

model Product {
  id          String   @id @default(cuid())
  name        String
  slug        String   @unique
  description String?
  image       String?
  published   Boolean  @default(false)
  categoryId  String

  category   Category         @relation(fields: [categoryId], references: [id])
  variants   ProductVariant[]
  orderItems OrderItem[]

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

model ProductVariant {
  id        String  @id @default(cuid())
  name      String
  price     Int     // cena v haléřích (CZK)
  stock     Int     @default(0)
  sku       String? @unique
  productId String

  product    Product     @relation(fields: [productId], references: [id], onDelete: Cascade)
  cartItems  CartItem[]
  orderItems OrderItem[]

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

// ─── Košík ────────────────────────────────────────────────────────────────

model Cart {
  id        String     @id @default(cuid())
  sessionId String?    @unique // pro guest uživatele
  userId    String?    @unique // pro přihlášené
  items     CartItem[]

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

model CartItem {
  id        String @id @default(cuid())
  cartId    String
  variantId String
  quantity  Int

  cart    Cart           @relation(fields: [cartId], references: [id], onDelete: Cascade)
  variant ProductVariant @relation(fields: [variantId], references: [id])

  @@unique([cartId, variantId])
}

// ─── Objednávky ───────────────────────────────────────────────────────────

model Order {
  id              String      @id @default(cuid())
  userId          String?
  guestEmail      String?
  status          OrderStatus @default(PENDING)
  totalAmount     Int         // v haléřích
  stripeSessionId String?     @unique

  shippingName    String
  shippingEmail   String
  shippingPhone   String?
  shippingStreet  String
  shippingCity    String
  shippingZip     String
  shippingCountry String      @default("CZ")

  user  User?       @relation(fields: [userId], references: [id])
  items OrderItem[]

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

model OrderItem {
  id        String @id @default(cuid())
  orderId   String
  productId String
  variantId String
  quantity  Int
  unitPrice Int    // cena v době objednávky (snapshot)

  order   Order          @relation(fields: [orderId], references: [id], onDelete: Cascade)
  product Product        @relation(fields: [productId], references: [id])
  variant ProductVariant @relation(fields: [variantId], references: [id])
}

enum OrderStatus {
  PENDING
  PAID
  PROCESSING
  SHIPPED
  DELIVERED
  CANCELLED
  REFUNDED
}