model LaborPreset {
  id             String            @id @default(cuid())
  name           String
  description    String?
  isArchived     Boolean           @default(false)
  createdAt      DateTime          @default(now())
  updatedAt      DateTime          @updatedAt
  userId         String
  organizationId String
  organization   Organization      @relation(fields: [organizationId], references: [id], onDelete: Cascade)
  items          LaborPresetItem[]
  parts          LaborPresetPart[]

  @@index([organizationId])
  @@map("labor_presets")
}

model LaborPresetItem {
  id          String      @id @default(cuid())
  description String
  hours       Float       @default(0)
  rate        Float       @default(0)
  pricingType String      @default("hourly")
  sortOrder   Int         @default(0)
  presetId    String
  preset      LaborPreset @relation(fields: [presetId], references: [id], onDelete: Cascade)

  @@index([presetId])
  @@map("labor_preset_items")
}

model LaborPresetPart {
  id              String  @id @default(cuid())
  name            String
  partNumber      String?
  quantity        Float   @default(1)
  /// Unit of measure snapshotted from InventoryPart at pick time.
  unit            String?
  unitPrice       Float   @default(0)
  inventoryPartId String?
  sortOrder       Int     @default(0)

  presetId String
  preset   LaborPreset @relation(fields: [presetId], references: [id], onDelete: Cascade)

  @@index([presetId])
  @@map("labor_preset_parts")
}

model InventoryPart {
  id            String  @id @default(cuid())
  partNumber    String?
  barcode       String?
  name          String
  description   String?
  category      String?
  quantity      Float   @default(0)
  minQuantity   Float   @default(0)
  /// Unit of measure for `quantity` (e.g. "pcs", "l", "kg"). Free text,
  /// snapshotted onto part lines at pick time so invoices keep the unit the
  /// part had when it was billed.
  unit          String?
  unitCost      Float   @default(0)
  sellPrice     Float   @default(0)
  supplier      String?
  supplierPhone String?
  supplierEmail String?
  supplierUrl   String?
  imageUrl      String?
  location      String?
  isArchived    Boolean @default(false)

  /// Set when a low-stock alert has been sent for the current dip below
  /// `minQuantity`, and cleared once stock climbs back above it. This
  /// hysteresis is what stops a part that sits at zero from re-alerting on
  /// every check — it alerts once per descent, not once per run.
  lowStockAlertedAt DateTime?

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

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

  organizationId String?
  organization   Organization? @relation(fields: [organizationId], references: [id], onDelete: Cascade)

  gallery   StoredImage[]   @relation("InventoryPartImages")
  movements StockMovement[]

  @@unique([organizationId, barcode])
  @@index([organizationId])
  @@map("inventory_parts")
}

/// Append-only audit trail of every change to InventoryPart.quantity.
///
/// Written inside the same transaction as the stock mutation itself, so the
/// ledger can never drift from the balance it describes. `quantityAfter` is
/// captured from the atomic `UPDATE ... RETURNING`, giving an exact running
/// balance even under concurrent writes.
model StockMovement {
  id String @id @default(cuid())

  /// Signed change in stock units (fractional allowed, e.g. 0.5 l).
  /// Negative = consumed, positive = restocked.
  delta         Float
  /// Part balance immediately after this movement was applied.
  quantityAfter Float
  /// Why the stock moved — see StockMovementReason in src/features/inventory/Lib/stockMovement.ts
  reason        String
  note          String?

  inventoryPartId String
  inventoryPart   InventoryPart @relation(fields: [inventoryPartId], references: [id], onDelete: Cascade)

  /// The job the part was used on. Kept on SetNull so history survives
  /// deletion of the service record — "where was this used" outlives the job.
  serviceRecordId String?
  serviceRecord   ServiceRecord? @relation(fields: [serviceRecordId], references: [id], onDelete: SetNull)

  /// Denormalised so history still reads correctly after a service record is
  /// deleted and serviceRecordId goes null.
  serviceRecordLabel String?

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

  organizationId String
  organization   Organization @relation(fields: [organizationId], references: [id], onDelete: Cascade)

  createdAt DateTime @default(now())

  @@index([inventoryPartId, createdAt(sort: Desc)])
  @@index([organizationId, createdAt(sort: Desc)])
  @@index([serviceRecordId])
  @@map("stock_movements")
}

model StoredImage {
  id          String   @id @default(cuid())
  url         String
  fileName    String?
  description String?
  sortOrder   Int      @default(0)
  createdAt   DateTime @default(now())

  inventoryPartId String?
  inventoryPart   InventoryPart? @relation("InventoryPartImages", fields: [inventoryPartId], references: [id], onDelete: Cascade)

  /// Condition photos taken when a tire is measured. Second parent on this
  /// model — an image belongs to exactly one of them.
  tireMeasurementId String?
  tireMeasurement   TireMeasurement? @relation("TireMeasurementImages", fields: [tireMeasurementId], references: [id], onDelete: Cascade)

  @@index([inventoryPartId])
  @@index([tireMeasurementId])
  @@map("stored_images")
}