// MRP QR Code system — database schema
// Provider: SQLite (enums stored as string constants; JSON stored as strings)

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

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

// ---------------------------------------------------------------------------
// Users & sessions
// ---------------------------------------------------------------------------

/// role: "admin" | "operator"
/// admins authenticate with email + password
/// operators authenticate with name + 4-digit PIN
model User {
  id             String    @id @default(cuid())
  role           String
  name           String
  email          String?   @unique
  passwordHash   String?
  pinHash        String?
  active         Boolean   @default(true)
  failedAttempts Int       @default(0)
  lockedUntil    DateTime?
  lastLoginAt    DateTime?
  createdAt      DateTime  @default(now())
  updatedAt      DateTime  @updatedAt

  sessions   Session[]
  timeLogs   TimeLog[]
  qcRecords  QCRecord[]
  auditLogs  AuditLog[]  @relation("ActorLogs")
  claimedOps Operation[] @relation("ClaimedBy")

  @@index([role, active])
}

model Session {
  id          String   @id @default(cuid())
  userId      String
  tokenHash   String   @unique
  deviceLabel String?
  userAgent   String?
  ipAddress   String?
  expiresAt   DateTime
  createdAt   DateTime @default(now())
  lastSeenAt  DateTime @default(now())

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

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

// ---------------------------------------------------------------------------
// Shop floor: machines + operation templates
// ---------------------------------------------------------------------------

model Machine {
  id        String   @id @default(cuid())
  name      String   @unique
  kind      String // free-form: NCT_PUNCH | PRESS_BRAKE | RIVET | WELD | OTHER
  location  String?
  notes     String?
  active    Boolean  @default(true)
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  templates  OperationTemplate[]
  operations Operation[]
}

/// Reusable recipe an admin can pick from when authoring an operation on a part.
model OperationTemplate {
  id                  String   @id @default(cuid())
  name                String   @unique
  machineId           String?
  defaultSettings     String? // JSON-encoded key/value
  defaultInstructions String?
  qcRequired          Boolean  @default(false)
  active              Boolean  @default(true)
  createdAt           DateTime @default(now())
  updatedAt           DateTime @updatedAt

  machine    Machine?    @relation(fields: [machineId], references: [id], onDelete: SetNull)
  operations Operation[]
}

// ---------------------------------------------------------------------------
// Project hierarchy: Project → Assembly → Part → Operation
// ---------------------------------------------------------------------------

model Project {
  id           String    @id @default(cuid())
  code         String    @unique
  name         String
  customerCode String?
  dueDate      DateTime?
  status       String    @default("planning") // planning | in_progress | completed | cancelled
  notes        String?
  createdAt    DateTime  @default(now())
  updatedAt    DateTime  @updatedAt

  assemblies     Assembly[]
  fasteners      Fastener[]
  purchaseOrders PurchaseOrder[]
}

model Assembly {
  id            String   @id @default(cuid())
  projectId     String
  code          String
  name          String
  qty           Int      @default(1)
  notes         String?
  stepFileId    String?
  drawingFileId String?
  cutFileId     String?
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt

  project     Project    @relation(fields: [projectId], references: [id], onDelete: Cascade)
  parts       Part[]
  stepFile    FileAsset? @relation("AssemblyStep", fields: [stepFileId], references: [id], onDelete: SetNull)
  drawingFile FileAsset? @relation("AssemblyDrawing", fields: [drawingFileId], references: [id], onDelete: SetNull)
  cutFile     FileAsset? @relation("AssemblyCut", fields: [cutFileId], references: [id], onDelete: SetNull)

  @@unique([projectId, code])
}

model Part {
  id              String   @id @default(cuid())
  assemblyId      String
  code            String
  name            String
  material        String?
  qty             Int      @default(1)
  notes           String?
  stepFileId      String?
  drawingFileId   String?
  cutFileId       String?
  thumbnailFileId String?
  createdAt       DateTime @default(now())
  updatedAt       DateTime @updatedAt

  assembly      Assembly    @relation(fields: [assemblyId], references: [id], onDelete: Cascade)
  stepFile      FileAsset?  @relation("PartStep", fields: [stepFileId], references: [id], onDelete: SetNull)
  drawingFile   FileAsset?  @relation("PartDrawing", fields: [drawingFileId], references: [id], onDelete: SetNull)
  cutFile       FileAsset?  @relation("PartCut", fields: [cutFileId], references: [id], onDelete: SetNull)
  thumbnailFile FileAsset?  @relation("PartThumbnail", fields: [thumbnailFileId], references: [id], onDelete: SetNull)
  operations    Operation[]

  @@unique([assemblyId, code])
}

/// A single shop-floor step on a specific part. Each has its own QR traveler card.
/// Only one operator may hold the claim at a time (claimedByUserId set).
model Operation {
  id              String    @id @default(cuid())
  partId          String
  sequence        Int
  templateId      String?
  name            String
  machineId       String?
  /// "work" (default) = regular production step, "qc" = dedicated inspection
  /// step whose entire purpose is pass/fail. QC ops always require a QC record
  /// on close and don't care about machines/units.
  kind            String    @default("work") // work | qc
  settings        String? // JSON
  materialNotes   String?
  instructions    String?
  qcRequired      Boolean   @default(false)
  /// pending | in_progress | partial | completed | qc_failed
  /// qc_failed: operator submitted QC fail on close — step is blocked until
  /// an admin resets it via /api/v1/operations/:id/qc-reset.
  status          String    @default("pending")
  qrToken         String    @unique
  claimedByUserId String?
  claimedAt       DateTime?
  completedAt     DateTime?
  plannedMinutes  Int?
  plannedUnits    Int?
  /// Cumulative units recorded across every Start→Pause/Done cycle on this op.
  /// Incremented whenever an operator hands in a non-zero `unitsProcessed`.
  unitsCompleted  Int       @default(0)
  createdAt       DateTime  @default(now())
  updatedAt       DateTime  @updatedAt

  part      Part               @relation(fields: [partId], references: [id], onDelete: Cascade)
  template  OperationTemplate? @relation(fields: [templateId], references: [id], onDelete: SetNull)
  machine   Machine?           @relation(fields: [machineId], references: [id], onDelete: SetNull)
  claimedBy User?              @relation("ClaimedBy", fields: [claimedByUserId], references: [id], onDelete: SetNull)
  timeLogs  TimeLog[]
  qcRecords QCRecord[]

  @@unique([partId, sequence])
  @@index([status])
  @@index([claimedByUserId])
}

model TimeLog {
  id             String    @id @default(cuid())
  operationId    String
  operatorId     String
  startedAt      DateTime
  endedAt        DateTime?
  unitsProcessed Int?
  note           String?
  createdAt      DateTime  @default(now())

  operation Operation @relation(fields: [operationId], references: [id], onDelete: Cascade)
  operator  User      @relation(fields: [operatorId], references: [id])

  @@index([operationId])
  @@index([operatorId])
}

model QCRecord {
  id           String   @id @default(cuid())
  operationId  String
  operatorId   String
  kind         String // "inline" | "dedicated"
  measurements String? // JSON
  passed       Boolean
  notes        String?
  createdAt    DateTime @default(now())

  operation Operation @relation(fields: [operationId], references: [id], onDelete: Cascade)
  operator  User      @relation(fields: [operatorId], references: [id])

  @@index([operationId])
}

// ---------------------------------------------------------------------------
// Purchasing: fasteners + POs
// ---------------------------------------------------------------------------

model Fastener {
  id          String   @id @default(cuid())
  projectId   String
  partNumber  String
  description String
  qty         Int
  supplier    String?
  unitCost    Float?
  notes       String?
  createdAt   DateTime @default(now())
  updatedAt   DateTime @updatedAt

  project Project  @relation(fields: [projectId], references: [id], onDelete: Cascade)
  poLines POLine[]

  @@index([projectId])
}

model PurchaseOrder {
  id         String    @id @default(cuid())
  projectId  String
  vendor     String
  status     String    @default("draft") // draft | sent | partial | received | cancelled
  sentAt     DateTime?
  receivedAt DateTime?
  notes      String?
  pdfFileId  String?
  createdAt  DateTime  @default(now())
  updatedAt  DateTime  @updatedAt

  project Project    @relation(fields: [projectId], references: [id], onDelete: Cascade)
  pdfFile FileAsset? @relation("PoPdf", fields: [pdfFileId], references: [id], onDelete: SetNull)
  lines   POLine[]
}

model POLine {
  id          String @id @default(cuid())
  poId        String
  fastenerId  String
  qty         Int
  unitCost    Float?
  receivedQty Int    @default(0)

  po       PurchaseOrder @relation(fields: [poId], references: [id], onDelete: Cascade)
  fastener Fastener      @relation(fields: [fastenerId], references: [id])
}

// ---------------------------------------------------------------------------
// Files & audit
// ---------------------------------------------------------------------------

model FileAsset {
  id           String   @id @default(cuid())
  kind         String // step | pdf | dxf | svg | png | jpg | other
  originalName String
  path         String // relative to UPLOAD_DIR
  sizeBytes    Int
  mimeType     String?
  sha256       String   @unique
  uploadedBy   String?
  uploadedAt   DateTime @default(now())

  partStep        Part[]          @relation("PartStep")
  partDrawing     Part[]          @relation("PartDrawing")
  partCut         Part[]          @relation("PartCut")
  partThumbnail   Part[]          @relation("PartThumbnail")
  assemblyStep    Assembly[]      @relation("AssemblyStep")
  assemblyDrawing Assembly[]      @relation("AssemblyDrawing")
  assemblyCut     Assembly[]      @relation("AssemblyCut")
  poPdfs          PurchaseOrder[] @relation("PoPdf")
}

model AuditLog {
  id        String   @id @default(cuid())
  actorId   String?
  action    String // e.g. "create", "update", "delete", "login", "claim_op", "close_op"
  entity    String
  entityId  String?
  before    String? // JSON
  after     String? // JSON
  ipAddress String?
  at        DateTime @default(now())

  actor User? @relation("ActorLogs", fields: [actorId], references: [id], onDelete: SetNull)

  @@index([entity, entityId])
  @@index([at])
}