// Craftvia — Prisma-Schema (Fundament)
//
// Enthält ausschließlich die Plattform-Grundlage: Mandanten, Identitäten/Mitgliedschaften,
// RBAC, Audit-Log, Mail, Auth-Tokens, Backup/DSGVO. Die Craftvia-Fachmodelle (Kunden,
// Objekte, Aufträge, …) liefert die Architektur separat (docs/craftvia/ARCHITEKTUR.md).
//
// Multi-Tenant-Regel: Jede fachliche Tabelle trägt tenantId. Zugriff nur über den
// zentralen Tenant-Guard (src/server/db.ts); zusätzlich Postgres RLS.
// Neue Tenant-Tabelle ⇒ in der Migration `SELECT enable_tenant_rls('<table>');` aufrufen
// UND das Modell in beide TENANT_MODELS-Listen (src/server/db.ts, src/server/backup/topology.ts)
// eintragen — siehe docs/craftvia/MIGRATIONS.md.

generator client {
  provider        = "prisma-client-js"
  previewFeatures = ["postgresqlExtensions"]
}

datasource db {
  provider   = "postgresql"
  extensions = [pgvector(map: "vector")]
}

enum TenantStatus {
  ACTIVE
  SUSPENDED
  ARCHIVED
}

enum UserStatus {
  ACTIVE
  INVITED
  LOCKED
  DEACTIVATED
}

model Tenant {
  id        String       @id @default(cuid())
  name      String
  slug      String       @unique
  short     String?
  sector    String?
  status    TenantStatus @default(ACTIVE)
  config    Json         @default("{}")
  createdAt DateTime     @default(now()) @map("created_at")
  updatedAt DateTime     @updatedAt @map("updated_at")

  users     User[]
  roles     Role[]
  auditLogs AuditLog[]
  settings  TenantSettings?
  modules   TenantModule[]

  @@map("tenants")
}

// Mandanten-Einstellungen: Unternehmensdaten, Branding, Sicherheits-Policy.
model TenantSettings {
  id             String   @id @default(cuid())
  tenantId       String   @unique @map("tenant_id")
  orgName        String   @map("org_name")
  orgShort       String?  @map("org_short")
  address        String?
  phone          String?
  email          String?
  sector         String?
  // Platzhalter für das Mandanten-Logo im Objektspeicher (Upload folgt).
  logoKey        String?  @map("logo_key")
  accent         String?
  locale         String   @default("de")
  timezone       String   @default("Europe/Berlin")
  securityPolicy Json     @default("{}") @map("security_policy") // pw/mfa/session
  smtp           Json     @default("{}")
  createdAt      DateTime @default(now()) @map("created_at")
  updatedAt      DateTime @updatedAt @map("updated_at")

  tenant Tenant @relation(fields: [tenantId], references: [id], onDelete: Cascade)

  @@index([tenantId])
  @@map("tenant_settings")
}

// Modul-Freischaltung je Mandant (Feature-Toggle) — gated Navigation, API und Daten
model TenantModule {
  id        String   @id @default(cuid())
  tenantId  String   @map("tenant_id")
  moduleKey String   @map("module_key")
  enabled   Boolean  @default(true)
  createdAt DateTime @default(now()) @map("created_at")
  updatedAt DateTime @updatedAt @map("updated_at")

  tenant Tenant @relation(fields: [tenantId], references: [id], onDelete: Cascade)

  @@unique([tenantId, moduleKey])
  @@index([tenantId])
  @@map("tenant_modules")
}

// Zentrale, GLOBALE Anmelde-Identität einer Person. E-Mail/Passwort/MFA leben hier;
// die per-Mandant-Zeile `User` ist die "Mitgliedschaft" und verweist per identityId hierher.
//   - Identity ist GLOBAL: KEIN tenant_id, NICHT in TENANT_MODELS, KEINE RLS-Policy.
//     Lookup läuft über den Owner-`prisma`-Client (Login).
model Identity {
  id                 String    @id @default(cuid())
  email              String    @unique
  passwordHash       String    @map("password_hash")
  // Erzwungener Passwortwechsel beim nächsten Login (Initial-/Reset-Passwort).
  mustChangePassword Boolean   @default(false) @map("must_change_password")
  // Optionale TOTP-MFA der Identity. recoveryCodes = Argon2id-Hashes (F-17).
  mfaSecret          String?   @map("mfa_secret")
  mfaEnrolledAt      DateTime? @map("mfa_enrolled_at")
  recoveryCodes      Json      @default("[]") @map("recovery_codes")
  // F-17: zuletzt akzeptierter TOTP-Zeitschritt (RFC 6238) — Replay-Schutz.
  lastTotpStep       BigInt?   @map("last_totp_step")
  // Brute-Force-Schutz Login (F-05): Fehlversuchszähler + Sperre bis.
  failedLogins       Int       @default(0) @map("failed_logins")
  lockedUntil        DateTime? @map("locked_until")
  // SEC2: globaler Session-Kill-Switch. Ein Token, dessen `iat` davor liegt, gilt als ungültig.
  sessionsValidAfter DateTime? @map("sessions_valid_after")
  status             String    @default("ACTIVE") // ACTIVE | LOCKED | DISABLED
  // Persönliche UI-Sprache der Person (folgt der Identity über alle Mandanten).
  uiLocale           String    @default("de") @map("ui_locale") // de | en
  createdAt          DateTime  @default(now()) @map("created_at")
  updatedAt          DateTime  @updatedAt @map("updated_at")

  memberships         User[]
  // Passkeys sind identitäts-, nicht mandantengebunden.
  webauthnCredentials WebAuthnCredential[]

  @@map("identities")
}

// Mitgliedschaft einer Identity in einem Mandanten.
model User {
  id         String     @id @default(cuid())
  tenantId   String     @map("tenant_id")
  identityId String     @map("identity_id")
  email      String // Denormalisierung (Anzeige/Filter, Upsert-Key tenantId_email)
  name       String
  status     UserStatus @default(ACTIVE)
  createdAt  DateTime   @default(now()) @map("created_at")
  updatedAt  DateTime   @updatedAt @map("updated_at")

  tenant    Tenant     @relation(fields: [tenantId], references: [id])
  identity  Identity   @relation(fields: [identityId], references: [id])
  userRoles UserRole[]

  teamsLed             Team[]              @relation("TeamLeader")
  teamMemberships      TeamMember[]        @relation("TeamMemberships")
  workOrdersLed        WorkOrder[]         @relation("WorkOrderTeamLead")
  workOrderAssignments WorkOrderAssignee[] @relation("WorkOrderAssignments")
  workSessions         WorkSession[]       @relation("WorkSessionUser")
  notifications        Notification[]      @relation("UserNotifications")

  @@unique([tenantId, email])
  // Eine Person (Identity) hat je Mandant höchstens EINE Mitgliedschaft.
  @@unique([tenantId, identityId])
  @@index([tenantId])
  @@index([identityId])
  @@map("users")
}

// WebAuthn/Passkey-Credential einer GLOBALEN Identity (2. Faktor, Alternative zu TOTP).
// KEIN tenant_id, NICHT in TENANT_MODELS, keine RLS. credentialId/publicKey base64url.
model WebAuthnCredential {
  id           String    @id @default(cuid())
  identityId   String    @map("identity_id")
  credentialId String    @unique @map("credential_id")
  publicKey    String    @map("public_key")
  counter      BigInt    @default(0)
  transports   String[]  @default([])
  deviceName   String?   @map("device_name")
  createdAt    DateTime  @default(now()) @map("created_at")
  lastUsedAt   DateTime? @map("last_used_at")

  identity Identity @relation(fields: [identityId], references: [id], onDelete: Cascade)

  @@index([identityId])
  @@map("webauthn_credentials")
}

model Role {
  id       String @id @default(cuid())
  tenantId String @map("tenant_id")
  key      String // z. B. tenant-admin, backoffice, team-lead, technician
  name     String

  tenant          Tenant           @relation(fields: [tenantId], references: [id])
  userRoles       UserRole[]
  rolePermissions RolePermission[]

  @@unique([tenantId, key])
  @@index([tenantId])
  @@map("roles")
}

model Permission {
  id  String @id @default(cuid())
  key String @unique // z. B. customer:read, work_order:write

  rolePermissions RolePermission[]

  @@map("permissions")
}

model UserRole {
  userId String @map("user_id")
  roleId String @map("role_id")

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

  @@id([userId, roleId])
  @@map("user_roles")
}

model RolePermission {
  roleId       String @map("role_id")
  permissionId String @map("permission_id")

  role       Role       @relation(fields: [roleId], references: [id], onDelete: Cascade)
  permission Permission @relation(fields: [permissionId], references: [id], onDelete: Cascade)

  @@id([roleId, permissionId])
  @@map("role_permissions")
}

// Plattform-Administratoren (Betreiber). Getrennter Store OHNE tenant_id, eigener
// Login (/platform/login), TOTP-MFA + Recovery-Codes. Kein Zugriff auf Mandanten-Fachdaten.
model PlatformAdmin {
  id                 String    @id @default(cuid())
  email              String    @unique
  passwordHash       String    @map("password_hash")
  name               String
  status             String    @default("ACTIVE") // ACTIVE | LOCKED | DISABLED
  // SEC4: Plattform-Rolle. "full" = Voll-Admin (darf verwalten), "readonly" = nur lesen.
  role               String    @default("full") @map("role") // full | readonly
  mfaSecret          String?   @map("mfa_secret")
  mfaEnrolledAt      DateTime? @map("mfa_enrolled_at")
  recoveryCodes      Json      @default("[]") @map("recovery_codes")
  failedLogins       Int       @default(0) @map("failed_logins")
  lockedUntil        DateTime? @map("locked_until")
  lastTotpStep       BigInt?   @map("last_totp_step")
  lastLoginAt        DateTime? @map("last_login_at")
  sessionsValidAfter DateTime? @map("sessions_valid_after")
  createdAt          DateTime  @default(now()) @map("created_at")
  updatedAt          DateTime  @updatedAt @map("updated_at")

  @@map("platform_admins")
}

// Plattformweite Betriebseinstellungen (Singleton).
model PlatformSetting {
  id          String  @id @default("singleton")
  mfaRequired Boolean @default(false) @map("mfa_required")

  // Backup-Zielspeicher. Präzedenz zur Laufzeit: DB-Config → Env (S3_*/BACKUP_LOCAL_DIR)
  // → lokaler Default `.backups`. Das S3-Secret liegt NUR verschlüsselt (secret-crypto).
  backupTarget         String  @default("local") @map("backup_target") // local | s3
  backupLocalDir       String? @map("backup_local_dir")
  backupS3Endpoint     String? @map("backup_s3_endpoint")
  backupS3Bucket       String? @map("backup_s3_bucket")
  backupS3Region       String? @map("backup_s3_region")
  backupS3AccessKey    String? @map("backup_s3_access_key")
  backupS3SecretKeyEnc String? @map("backup_s3_secret_key_enc")

  updatedAt DateTime @updatedAt @map("updated_at")

  @@map("platform_settings")
}

model AuditLog {
  id        String   @id @default(cuid())
  // Nullable: Plattform-Ereignisse (scope=platform) haben keinen Mandantenbezug.
  tenantId  String?  @map("tenant_id")
  scope     String   @default("tenant") // tenant | platform
  actorId   String?  @map("actor_id")
  action    String // create | update | delete | login | denied | export | …
  entity    String // z. B. user, role, tenant
  entityId  String?  @map("entity_id")
  before    Json?
  after     Json?
  createdAt DateTime @default(now()) @map("created_at")

  tenant Tenant? @relation(fields: [tenantId], references: [id])

  @@index([tenantId, entity, entityId])
  @@index([tenantId, createdAt])
  @@map("audit_logs")
}

/// Versandprotokoll jeder Mail (Auditierbarkeit + Idempotenz).
///
/// `tenantId` ist nullable: Plattform-Mails haben keinen Mandantenbezug (scope=platform).
/// `dedupeKey` ist plattformweit unique und verhindert Doppelversand.
/// Bewusst NICHT gespeichert: Mail-Inhalt und alle Token/Secrets.
model MailLog {
  id                String    @id @default(cuid())
  tenantId          String?   @map("tenant_id")
  scope             String    @default("tenant") // tenant | platform
  to                String
  template          String
  locale            String    @default("de")
  status            String    @default("pending") // pending | sent | failed | bounced | suppressed
  providerMessageId String?   @map("provider_message_id")
  error             String?
  attempts          Int       @default(0)
  dedupeKey         String?   @unique @map("dedupe_key")
  createdAt         DateTime  @default(now()) @map("created_at")
  sentAt            DateTime? @map("sent_at")

  @@index([tenantId, createdAt])
  @@index([status])
  @@map("mail_logs")
}

/// Benachrichtigungs-Einstellung je Nutzer und Ereignistyp.
///
/// Default ist opt-in: fehlt eine Zeile, gilt `email = true`. Transaktionsmails
/// (Reset, Passwortwechsel) unterliegen dieser Steuerung NICHT.
model NotificationPreference {
  id        String   @id @default(cuid())
  tenantId  String   @map("tenant_id")
  userId    String   @map("user_id")
  eventType String   @map("event_type") // Ereignistyp der Fachmodule, z. B. work_order_assigned
  email     Boolean  @default(true)
  locale    String?
  createdAt DateTime @default(now()) @map("created_at")
  updatedAt DateTime @updatedAt @map("updated_at")

  @@unique([userId, eventType])
  @@index([tenantId])
  @@map("notification_preferences")
}

/// Einmal-Token für Passwort-Reset, Einladung und E-Mail-Änderung.
///
/// Das Rohtoken steht ausschließlich im Link; in der DB liegt nur sein SHA-256-Hash.
/// `principalType` unterscheidet Mandanten-Nutzer und Plattform-Admins. `tenantId` ist
/// nur bei `tenant_user` gesetzt; Plattform-Zeilen haben `tenantId = null`.
model AuthToken {
  id            String    @id @default(cuid())
  principalType String    @map("principal_type") // tenant_user | platform_admin
  principalId   String    @map("principal_id")
  tenantId      String?   @map("tenant_id")
  type          String // password_reset | email_change | invitation
  tokenHash     String    @unique @map("token_hash")
  /// Nur bei type=email_change: die zu bestätigende neue Adresse.
  newEmail      String?   @map("new_email")
  expiresAt     DateTime  @map("expires_at")
  usedAt        DateTime? @map("used_at")
  requestIp     String?   @map("request_ip")
  createdAt     DateTime  @default(now()) @map("created_at")

  @@index([principalType, principalId, type])
  @@index([expiresAt])
  @@map("auth_tokens")
}

// =============================================================================
// Backup/DSGVO — GLOBALE Modelle (kein tenant_id-RLS)
// =============================================================================

/// Löschnachweis (Art. 17 DSGVO). GLOBAL — überdauert eine Mandanten-Löschung.
/// Enthält nur Metadaten, KEINE gelöschten Personendaten selbst.
model DeletionCertificate {
  id                String   @id @default(cuid())
  /// tenant | person
  scope             String
  tenantId          String?  @map("tenant_id")
  tenantSlug        String?  @map("tenant_slug")
  subjectIdentityId String?  @map("subject_identity_id")
  subjectEmail      String?  @map("subject_email")
  actorId           String?  @map("actor_id")
  /// Zeilenzahlen je Modell, die HART gelöscht wurden (JSON: {model: count}).
  deletedCounts     Json     @default("{}") @map("deleted_counts")
  /// Zeilenzahlen je Modell, die ANONYMISIERT wurden.
  anonymizedCounts  Json     @default("{}") @map("anonymized_counts")
  snapshotId        String?  @map("snapshot_id")
  reason            String?
  createdAt         DateTime @default(now()) @map("created_at")

  @@index([tenantId])
  @@index([subjectIdentityId])
  @@map("deletion_certificates")
}

/// Tombstone/Löschliste. GLOBAL — überlebt einen Tenant-Restore bewusst (nicht in
/// TENANT_MODELS), damit ein alter Snapshot gelöschte PII NICHT zurückbringt.
model TombstoneEntry {
  id               String   @id @default(cuid())
  tenantId         String   @map("tenant_id")
  /// Prisma-Modellname der betroffenen Tabelle (z. B. "User").
  model            String
  targetField      String   @map("target_field")
  targetValue      String   @map("target_value")
  /// delete | anonymize
  action           String
  anonymizedFields Json     @default("{}") @map("anonymized_fields")
  reason           String?
  createdAt        DateTime @default(now()) @map("created_at")

  @@unique([tenantId, model, targetValue])
  @@index([tenantId])
  @@map("tombstone_entries")
}

/// Betreiber-Portal: Status eines Backup-/DSGVO-Jobs. GLOBAL (Plattform-Fähigkeit).
/// Enthält KEINE PII und KEINE Secrets — nur Ausführungs-Metadaten.
model BackupJob {
  id                String    @id @default(cuid())
  /// tenant_restore | tenant_export | dsgvo_export
  kind              String
  /// queued | running | done | failed
  status            String    @default("queued")
  tenantId          String    @map("tenant_id")
  tenantSlug        String?   @map("tenant_slug")
  subjectIdentityId String?   @map("subject_identity_id")
  actorId           String?   @map("actor_id")
  snapshotId        String?   @map("snapshot_id")
  params            Json      @default("{}")
  result            Json?
  error             String?
  downloadToken     String?   @unique @map("download_token")
  downloadExpiresAt DateTime? @map("download_expires_at")
  createdAt         DateTime  @default(now()) @map("created_at")
  updatedAt         DateTime  @updatedAt @map("updated_at")

  @@index([tenantId])
  @@index([status])
  @@map("backup_jobs")
}

// ============================================================================
// Craftvia domain model (MVP) — appended to prisma/schema.prisma
// Conventions: camelCase fields @map snake_case, tables @@map plural snake_case.
// Every tenant table carries tenantId (plain column, guarded by dbForTenant + RLS)
// and is listed in BOTH TENANT_MODELS lists (src/server/db.ts, backup/topology.ts).
// Soft delete: deletedAt on business records (spec §27.5).
// ============================================================================

// ---------- Numbering / configuration ----------

model NumberSequence {
  id        String   @id @default(cuid())
  tenantId  String   @map("tenant_id")
  key       String // "customer" | "work_order" | "report" | "emergency"
  prefix    String   @default("")
  nextValue Int      @default(1) @map("next_value")
  padding   Int      @default(5)
  updatedAt DateTime @updatedAt @map("updated_at")

  @@unique([tenantId, key])
  @@map("number_sequences")
}

model OrderType {
  id                String   @id @default(cuid())
  tenantId          String   @map("tenant_id")
  key               String // montage | reparatur | wartung | stoerung | notdienst | besichtigung | abnahme | nacharbeit | custom
  name              String
  active            Boolean  @default(true)
  signatureRequired Boolean  @default(true) @map("signature_required")
  sortOrder         Int      @default(0) @map("sort_order")
  createdAt         DateTime @default(now()) @map("created_at")
  updatedAt         DateTime @updatedAt @map("updated_at")

  checklistTemplates ChecklistTemplate[]
  workOrders         WorkOrder[]

  @@unique([tenantId, key])
  @@map("order_types")
}

model ChecklistTemplate {
  id             String   @id @default(cuid())
  tenantId       String   @map("tenant_id")
  orderTypeId    String?  @map("order_type_id")
  name           String
  active         Boolean  @default(true)
  // items: [{ key, label, required, requiresPhoto }]
  items          Json     @default("[]")
  // requiredPhotos: [{ key, label }]
  requiredPhotos Json     @default("[]") @map("required_photos")
  createdAt      DateTime @default(now()) @map("created_at")
  updatedAt      DateTime @updatedAt @map("updated_at")

  orderType OrderType? @relation(fields: [orderTypeId], references: [id], onDelete: SetNull)

  @@index([tenantId])
  @@map("checklist_templates")
}

// ---------- Customers / contacts / sites ----------

enum CustomerStatus {
  active
  inactive
  provisional // "Vorläufig – Prüfung durch Backoffice erforderlich"
  merged
}

model Customer {
  id             String         @id @default(cuid())
  tenantId       String         @map("tenant_id")
  customerNumber String?        @map("customer_number")
  companyName    String?        @map("company_name")
  salutation     String?
  firstName      String?        @map("first_name")
  lastName       String?        @map("last_name")
  street         String?
  houseNumber    String?        @map("house_number")
  postalCode     String?        @map("postal_code")
  city           String?
  country        String         @default("DE")
  phone          String?
  mobile         String?
  email          String?
  notes          String?
  billingNotes   String?        @map("billing_notes")
  status         CustomerStatus @default(active)
  isProvisional  Boolean        @default(false) @map("is_provisional")
  mergedIntoId   String?        @map("merged_into_id")
  createdById    String?        @map("created_by_id")
  createdAt      DateTime       @default(now()) @map("created_at")
  updatedAt      DateTime       @updatedAt @map("updated_at")
  deletedAt      DateTime?      @map("deleted_at")

  contacts   Contact[]
  sites      Site[]
  workOrders WorkOrder[]
  documents  Document[]

  @@unique([tenantId, customerNumber])
  @@index([tenantId, status])
  @@index([tenantId, companyName])
  @@index([tenantId, lastName])
  @@map("customers")
}

model Contact {
  id               String    @id @default(cuid())
  tenantId         String    @map("tenant_id")
  customerId       String    @map("customer_id")
  name             String
  role             String? // Funktion
  phone            String?
  mobile           String?
  email            String?
  preferredChannel String?   @map("preferred_channel") // phone | mobile | email
  notes            String?
  createdAt        DateTime  @default(now()) @map("created_at")
  updatedAt        DateTime  @updatedAt @map("updated_at")
  deletedAt        DateTime? @map("deleted_at")

  customer   Customer    @relation(fields: [customerId], references: [id], onDelete: Cascade)
  sites      Site[]
  workOrders WorkOrder[]

  @@index([tenantId, customerId])
  @@map("contacts")
}

enum SiteStatus {
  active
  inactive
  provisional
}

model Site {
  id             String     @id @default(cuid())
  tenantId       String     @map("tenant_id")
  customerId     String     @map("customer_id")
  name           String
  street         String?
  houseNumber    String?    @map("house_number")
  postalCode     String?    @map("postal_code")
  city           String?
  country        String     @default("DE")
  contactId      String?    @map("contact_id")
  onSiteContact  String?    @map("on_site_contact") // free text if no Contact
  phone          String?
  accessNotes    String?    @map("access_notes")
  parkingNotes   String?    @map("parking_notes")
  safetyNotes    String?    @map("safety_notes")
  technicalNotes String?    @map("technical_notes")
  status         SiteStatus @default(active)
  latitude       Float?
  longitude      Float?
  createdAt      DateTime   @default(now()) @map("created_at")
  updatedAt      DateTime   @updatedAt @map("updated_at")
  deletedAt      DateTime?  @map("deleted_at")

  customer   Customer    @relation(fields: [customerId], references: [id], onDelete: Restrict)
  contact    Contact?    @relation(fields: [contactId], references: [id], onDelete: SetNull)
  workOrders WorkOrder[]
  documents  Document[]

  @@index([tenantId, customerId])
  @@map("sites")
}

// ---------- Teams ----------

enum TeamStatus {
  active
  inactive
}

model Team {
  id           String     @id @default(cuid())
  tenantId     String     @map("tenant_id")
  name         String
  leaderUserId String?    @map("leader_user_id")
  status       TeamStatus @default(active)
  phone        String?
  vehicle      String?
  area         String?
  notes        String?
  createdAt    DateTime   @default(now()) @map("created_at")
  updatedAt    DateTime   @updatedAt @map("updated_at")
  deletedAt    DateTime?  @map("deleted_at")

  leader     User?        @relation("TeamLeader", fields: [leaderUserId], references: [id], onDelete: SetNull)
  members    TeamMember[]
  workOrders WorkOrder[]

  @@unique([tenantId, name])
  @@map("teams")
}

model TeamMember {
  id        String    @id @default(cuid())
  tenantId  String    @map("tenant_id")
  teamId    String    @map("team_id")
  userId    String    @map("user_id")
  validFrom DateTime  @default(now()) @map("valid_from")
  validTo   DateTime? @map("valid_to")

  team Team @relation(fields: [teamId], references: [id], onDelete: Cascade)
  user User @relation("TeamMemberships", fields: [userId], references: [id], onDelete: Cascade)

  @@index([tenantId, userId])
  @@index([teamId])
  @@map("team_members")
}

// ---------- Work orders ----------

enum WorkOrderStatus {
  draft
  review_required
  planned
  assigned
  accepted
  en_route
  in_progress
  paused
  waiting_material
  daily_report_created
  technically_completed
  signature_pending
  in_review
  released_for_billing
  billed
  cancelled
}

enum WorkOrderPriority {
  low
  normal
  high
  urgent
}

model WorkOrder {
  id                  String            @id @default(cuid())
  tenantId            String            @map("tenant_id")
  number              String // internal, from NumberSequence "work_order"
  externalOrderNumber String?           @map("external_order_number")
  offerNumber         String?           @map("offer_number")
  customerId          String            @map("customer_id")
  siteId              String?           @map("site_id")
  contactId           String?           @map("contact_id")
  orderTypeId         String?           @map("order_type_id")
  priority            WorkOrderPriority @default(normal)
  status              WorkOrderStatus   @default(draft)
  title               String
  description         String?
  scope               String? // Leistungsumfang
  plannedStart        DateTime?         @map("planned_start")
  plannedEnd          DateTime?         @map("planned_end")
  assignedTeamId      String?           @map("assigned_team_id")
  teamLeadUserId      String?           @map("team_lead_user_id")
  signatureRequired   Boolean           @default(true) @map("signature_required")
  billingType         String?           @map("billing_type") // fixed | time_material | maintenance_contract | warranty
  internalNotes       String?           @map("internal_notes")
  technicianNotes     String?           @map("technician_notes")
  isEmergency         Boolean           @default(false) @map("is_emergency")
  emergencyReason     String?           @map("emergency_reason")
  sourceImportId      String?           @unique @map("source_import_id")
  followUpWork        String?           @map("follow_up_work") // offene Folgearbeiten (aggregiert)
  // incremented on every mutation — used by offline sync conflict detection
  version             Int               @default(1)
  createdById         String?           @map("created_by_id")
  createdAt           DateTime          @default(now()) @map("created_at")
  updatedAt           DateTime          @updatedAt @map("updated_at")
  deletedAt           DateTime?         @map("deleted_at")

  customer     Customer   @relation(fields: [customerId], references: [id], onDelete: Restrict)
  site         Site?      @relation(fields: [siteId], references: [id], onDelete: SetNull)
  contact      Contact?   @relation(fields: [contactId], references: [id], onDelete: SetNull)
  orderType    OrderType? @relation(fields: [orderTypeId], references: [id], onDelete: SetNull)
  team         Team?      @relation(fields: [assignedTeamId], references: [id], onDelete: SetNull)
  teamLead     User?      @relation("WorkOrderTeamLead", fields: [teamLeadUserId], references: [id], onDelete: SetNull)
  sourceImport ImportJob? @relation("ImportCreatedOrder", fields: [sourceImportId], references: [id], onDelete: SetNull)

  assignees         WorkOrderAssignee[]
  statusHistory     WorkOrderStatusChange[]
  checklistItems    ChecklistItem[]
  photoRequirements PhotoRequirement[]
  materialPlans     MaterialPlan[]
  materialUsages    MaterialUsage[]
  workSessions      WorkSession[]
  notes             ActivityNote[]
  photos            Photo[]
  voiceNotes        VoiceNote[]
  reports           Report[]
  documents         Document[]

  @@unique([tenantId, number])
  @@index([tenantId, status])
  @@index([tenantId, assignedTeamId, status])
  @@index([tenantId, plannedStart])
  @@index([tenantId, customerId])
  @@index([tenantId, siteId])
  @@map("work_orders")
}

model WorkOrderAssignee {
  id          String @id @default(cuid())
  tenantId    String @map("tenant_id")
  workOrderId String @map("work_order_id")
  userId      String @map("user_id")

  workOrder WorkOrder @relation(fields: [workOrderId], references: [id], onDelete: Cascade)
  user      User      @relation("WorkOrderAssignments", fields: [userId], references: [id], onDelete: Cascade)

  @@unique([workOrderId, userId])
  @@index([tenantId, userId])
  @@map("work_order_assignees")
}

model WorkOrderStatusChange {
  id          String           @id @default(cuid())
  tenantId    String           @map("tenant_id")
  workOrderId String           @map("work_order_id")
  fromStatus  WorkOrderStatus? @map("from_status")
  toStatus    WorkOrderStatus  @map("to_status")
  actorId     String?          @map("actor_id")
  reason      String?
  createdAt   DateTime         @default(now()) @map("created_at")

  workOrder WorkOrder @relation(fields: [workOrderId], references: [id], onDelete: Cascade)

  @@index([tenantId, workOrderId])
  @@map("work_order_status_changes")
}

model ChecklistItem {
  id            String    @id @default(cuid())
  tenantId      String    @map("tenant_id")
  workOrderId   String    @map("work_order_id")
  key           String
  label         String
  required      Boolean   @default(false)
  requiresPhoto Boolean   @default(false) @map("requires_photo")
  sortOrder     Int       @default(0) @map("sort_order")
  checked       Boolean   @default(false)
  checkedById   String?   @map("checked_by_id")
  checkedAt     DateTime? @map("checked_at")
  comment       String?

  workOrder WorkOrder @relation(fields: [workOrderId], references: [id], onDelete: Cascade)
  photos    Photo[]

  @@index([tenantId, workOrderId])
  @@map("checklist_items")
}

model PhotoRequirement {
  id          String @id @default(cuid())
  tenantId    String @map("tenant_id")
  workOrderId String @map("work_order_id")
  key         String // ausgangszustand | typenschild | leitungsverlauf | zwischenschritt | fertige_montage | funktionspruefung | arbeitsbereich_abschluss | custom
  label       String
  sortOrder   Int    @default(0) @map("sort_order")

  workOrder WorkOrder @relation(fields: [workOrderId], references: [id], onDelete: Cascade)
  photos    Photo[]

  @@unique([workOrderId, key])
  @@index([tenantId])
  @@map("photo_requirements")
}

// ---------- Materials ----------

model MaterialPlan {
  id              String   @id @default(cuid())
  tenantId        String   @map("tenant_id")
  workOrderId     String   @map("work_order_id")
  name            String
  articleNumber   String?  @map("article_number")
  plannedQuantity Decimal  @map("planned_quantity") @db.Decimal(12, 3)
  unit            String
  notes           String?
  sortOrder       Int      @default(0) @map("sort_order")
  createdAt       DateTime @default(now()) @map("created_at")
  updatedAt       DateTime @updatedAt @map("updated_at")

  workOrder WorkOrder       @relation(fields: [workOrderId], references: [id], onDelete: Cascade)
  usages    MaterialUsage[]

  @@index([tenantId, workOrderId])
  @@map("material_plans")
}

enum MaterialUsageStatus {
  fully_used
  partially_used
  not_used
  additional
}

model MaterialUsage {
  id              String              @id @default(cuid())
  tenantId        String              @map("tenant_id")
  workOrderId     String              @map("work_order_id")
  materialPlanId  String?             @map("material_plan_id")
  workSessionId   String?             @map("work_session_id")
  name            String
  articleNumber   String?             @map("article_number")
  actualQuantity  Decimal             @map("actual_quantity") @db.Decimal(12, 3)
  unit            String
  usageStatus     MaterialUsageStatus @map("usage_status")
  deviationReason String?             @map("deviation_reason")
  notes           String?
  photoId         String?             @map("photo_id")
  recordedById    String?             @map("recorded_by_id")
  clientId        String?             @unique @map("client_id") // offline local id
  createdAt       DateTime            @default(now()) @map("created_at")
  updatedAt       DateTime            @updatedAt @map("updated_at")

  workOrder    WorkOrder     @relation(fields: [workOrderId], references: [id], onDelete: Cascade)
  materialPlan MaterialPlan? @relation(fields: [materialPlanId], references: [id], onDelete: SetNull)
  workSession  WorkSession?  @relation(fields: [workSessionId], references: [id], onDelete: SetNull)

  @@index([tenantId, workOrderId])
  @@map("material_usages")
}

// ---------- Field execution ----------

enum WorkSessionStatus {
  en_route
  running
  paused
  ended
}

model WorkSession {
  id             String            @id @default(cuid())
  tenantId       String            @map("tenant_id")
  workOrderId    String            @map("work_order_id")
  userId         String            @map("user_id")
  teamId         String?           @map("team_id")
  status         WorkSessionStatus @default(running)
  startedAt      DateTime          @map("started_at")
  endedAt        DateTime?         @map("ended_at")
  startLat       Float?            @map("start_lat")
  startLng       Float?            @map("start_lng")
  startedOffline Boolean           @default(false) @map("started_offline")
  deviceInfo     String?           @map("device_info")
  clientId       String?           @unique @map("client_id")
  createdAt      DateTime          @default(now()) @map("created_at")
  updatedAt      DateTime          @updatedAt @map("updated_at")

  workOrder WorkOrder       @relation(fields: [workOrderId], references: [id], onDelete: Cascade)
  user      User            @relation("WorkSessionUser", fields: [userId], references: [id], onDelete: Restrict)
  entries   TimeEntry[]
  materials MaterialUsage[]

  @@index([tenantId, workOrderId])
  @@index([tenantId, userId, status])
  @@map("work_sessions")
}

enum TimeEntryType {
  travel
  work
  break
  material_procurement
  return_travel
  interruption
}

model TimeEntry {
  id               String        @id @default(cuid())
  tenantId         String        @map("tenant_id")
  workSessionId    String        @map("work_session_id")
  userId           String        @map("user_id")
  type             TimeEntryType @default(work)
  startedAt        DateTime      @map("started_at")
  endedAt          DateTime?     @map("ended_at")
  // manual corrections must be audited (spec §12.2)
  corrected        Boolean       @default(false)
  correctionReason String?       @map("correction_reason")
  correctedById    String?       @map("corrected_by_id")
  clientId         String?       @unique @map("client_id")
  createdAt        DateTime      @default(now()) @map("created_at")
  updatedAt        DateTime      @updatedAt @map("updated_at")

  workSession WorkSession @relation(fields: [workSessionId], references: [id], onDelete: Cascade)

  @@index([tenantId, workSessionId])
  @@index([tenantId, userId, startedAt])
  @@map("time_entries")
}

enum ActivityNoteKind {
  work_done
  deviation
  problem
  additional_work
  not_executable
  follow_up
  recommendation
  customer_note
  general
}

model ActivityNote {
  id          String           @id @default(cuid())
  tenantId    String           @map("tenant_id")
  workOrderId String           @map("work_order_id")
  authorId    String?          @map("author_id")
  kind        ActivityNoteKind @default(general)
  text        String
  voiceNoteId String?          @unique @map("voice_note_id")
  clientId    String?          @unique @map("client_id")
  createdAt   DateTime         @default(now()) @map("created_at")
  updatedAt   DateTime         @updatedAt @map("updated_at")
  deletedAt   DateTime?        @map("deleted_at")

  workOrder WorkOrder  @relation(fields: [workOrderId], references: [id], onDelete: Cascade)
  voiceNote VoiceNote? @relation(fields: [voiceNoteId], references: [id], onDelete: SetNull)

  @@index([tenantId, workOrderId])
  @@map("activity_notes")
}

// ---------- Files ----------

enum DocumentCategory {
  order_confirmation
  technical_drawing
  floor_plan
  wiring_diagram
  assembly_instructions
  safety_document
  product_document
  customer_note
  work_record
  daily_report
  completion_report
  customer_approval
  photo
  voice_note
  signature
  other
}

enum DocumentVisibility {
  backoffice_only
  team_lead
  team
  customer_report
}

enum UploadStatus {
  pending
  uploaded
  failed
  quarantined
}

model Document {
  id             String             @id @default(cuid())
  tenantId       String             @map("tenant_id")
  customerId     String?            @map("customer_id")
  siteId         String?            @map("site_id")
  workOrderId    String?            @map("work_order_id")
  category       DocumentCategory
  title          String?
  fileName       String             @map("file_name")
  storageKey     String             @map("storage_key") // <tenantId>/...
  previewKey     String?            @map("preview_key") // thumbnail
  mimeType       String             @map("mime_type")
  fileSize       Int                @map("file_size")
  checksum       String // sha256 hex
  version        Int                @default(1)
  // groups versions of the same logical document
  lineageId      String             @map("lineage_id")
  visibility     DocumentVisibility @default(team)
  approvalStatus String?            @map("approval_status") // draft | approved
  uploadStatus   UploadStatus       @default(uploaded) @map("upload_status")
  uploadedById   String?            @map("uploaded_by_id")
  createdAt      DateTime           @default(now()) @map("created_at")
  updatedAt      DateTime           @updatedAt @map("updated_at")
  deletedAt      DateTime?          @map("deleted_at")

  customer  Customer?  @relation(fields: [customerId], references: [id], onDelete: SetNull)
  site      Site?      @relation(fields: [siteId], references: [id], onDelete: SetNull)
  workOrder WorkOrder? @relation(fields: [workOrderId], references: [id], onDelete: SetNull)

  @@unique([lineageId, version])
  @@index([tenantId, workOrderId])
  @@index([tenantId, siteId])
  @@index([tenantId, customerId])
  @@map("documents")
}

enum PhotoPhase {
  before
  during
  after
}

model Photo {
  id                 String      @id @default(cuid())
  tenantId           String      @map("tenant_id")
  workOrderId        String      @map("work_order_id")
  workSessionId      String?     @map("work_session_id")
  documentId         String      @unique @map("document_id")
  checklistItemId    String?     @map("checklist_item_id")
  photoRequirementId String?     @map("photo_requirement_id")
  phase              PhotoPhase?
  comment            String?
  takenAt            DateTime    @map("taken_at")
  latitude           Float?
  longitude          Float?
  takenById          String?     @map("taken_by_id")
  includeInReport    Boolean     @default(true) @map("include_in_report")
  clientId           String?     @unique @map("client_id")
  createdAt          DateTime    @default(now()) @map("created_at")

  workOrder        WorkOrder         @relation(fields: [workOrderId], references: [id], onDelete: Cascade)
  checklistItem    ChecklistItem?    @relation(fields: [checklistItemId], references: [id], onDelete: SetNull)
  photoRequirement PhotoRequirement? @relation(fields: [photoRequirementId], references: [id], onDelete: SetNull)

  @@index([tenantId, workOrderId])
  @@map("photos")
}

enum TranscriptionStatus {
  pending
  done
  failed
  disabled
}

model VoiceNote {
  id                  String              @id @default(cuid())
  tenantId            String              @map("tenant_id")
  workOrderId         String              @map("work_order_id")
  workSessionId       String?             @map("work_session_id")
  documentId          String              @unique @map("document_id")
  durationSeconds     Int?                @map("duration_seconds")
  transcript          String?
  transcriptionStatus TranscriptionStatus @default(pending) @map("transcription_status")
  transcriptionModel  String?             @map("transcription_model")
  recordedById        String?             @map("recorded_by_id")
  recordedAt          DateTime            @map("recorded_at")
  clientId            String?             @unique @map("client_id")
  createdAt           DateTime            @default(now()) @map("created_at")
  updatedAt           DateTime            @updatedAt @map("updated_at")

  workOrder    WorkOrder     @relation(fields: [workOrderId], references: [id], onDelete: Cascade)
  activityNote ActivityNote?

  @@index([tenantId, workOrderId])
  @@map("voice_notes")
}

// ---------- Reports & signatures ----------

enum ReportType {
  daily
  completion
}

enum ReportStatus {
  draft // incl. Lotse-Entwurf
  submitted // by technician, "Zur Prüfung"
  team_approved
  approved // final → immutable PDF
  rejected // correction requested
  superseded
}

model Report {
  id               String       @id @default(cuid())
  tenantId         String       @map("tenant_id")
  workOrderId      String       @map("work_order_id")
  type             ReportType
  reportDate       DateTime     @map("report_date") @db.Date
  version          Int          @default(1)
  // groups versions of the same report
  lineageId        String       @map("lineage_id")
  status           ReportStatus @default(draft)
  // structured snapshot (see src/lib/reports/content.ts ReportContent)
  content          Json
  aiDrafted        Boolean      @default(false) @map("ai_drafted")
  aiGenerationId   String?      @map("ai_generation_id")
  pdfDocumentId    String?      @unique @map("pdf_document_id")
  pdfChecksum      String?      @map("pdf_checksum")
  createdById      String?      @map("created_by_id")
  submittedAt      DateTime?    @map("submitted_at")
  teamApprovedById String?      @map("team_approved_by_id")
  teamApprovedAt   DateTime?    @map("team_approved_at")
  approvedById     String?      @map("approved_by_id")
  approvedAt       DateTime?    @map("approved_at")
  rejectionReason  String?      @map("rejection_reason")
  clientId         String?      @unique @map("client_id")
  createdAt        DateTime     @default(now()) @map("created_at")
  updatedAt        DateTime     @updatedAt @map("updated_at")

  workOrder WorkOrder  @relation(fields: [workOrderId], references: [id], onDelete: Restrict)
  signature Signature?

  @@unique([lineageId, version])
  @@index([tenantId, workOrderId])
  @@index([tenantId, status])
  @@map("reports")
}

enum SignatureOutcome {
  signed
  customer_absent
  refused
  later
  not_required
}

model Signature {
  id               String           @id @default(cuid())
  tenantId         String           @map("tenant_id")
  reportId         String           @unique @map("report_id")
  outcome          SignatureOutcome
  signerName       String?          @map("signer_name")
  signerRole       String?          @map("signer_role")
  imageDocumentId  String?          @unique @map("image_document_id") // PNG of the drawn signature
  confirmationText String?          @map("confirmation_text")
  reason           String? // required for absent/refused/later
  signedAt         DateTime         @map("signed_at")
  capturedById     String?          @map("captured_by_id")
  clientId         String?          @unique @map("client_id")
  createdAt        DateTime         @default(now()) @map("created_at")

  report Report @relation(fields: [reportId], references: [id], onDelete: Cascade)

  @@index([tenantId])
  @@map("signatures")
}

// ---------- PDF import ----------

enum ImportStatus {
  uploaded
  processing
  review_required // "Entwurf – Prüfung erforderlich"
  confirmed
  failed
  discarded
}

model ImportJob {
  id                  String       @id @default(cuid())
  tenantId            String       @map("tenant_id")
  documentId          String       @unique @map("document_id") // original file (kept forever)
  status              ImportStatus @default(uploaded)
  errorMessage        String?      @map("error_message")
  extractedText       String?      @map("extracted_text")
  // [{ field, value, confidence }] + positions — see src/lib/imports/extraction.ts
  extraction          Json?
  extractionVersion   String?      @map("extraction_version")
  extractionModel     String?      @map("extraction_model")
  provider            String?
  // user corrections: { field: { from, to } }
  corrections         Json?
  // duplicate candidates: [{ customerId, score, reasons[] }]
  duplicateCandidates Json?        @map("duplicate_candidates")
  importedById        String?      @map("imported_by_id")
  confirmedById       String?      @map("confirmed_by_id")
  confirmedAt         DateTime?    @map("confirmed_at")
  createdAt           DateTime     @default(now()) @map("created_at")
  updatedAt           DateTime     @updatedAt @map("updated_at")

  createdWorkOrder WorkOrder? @relation("ImportCreatedOrder")

  @@index([tenantId, status])
  @@map("import_jobs")
}

// ---------- Notifications ----------

model Notification {
  id         String    @id @default(cuid())
  tenantId   String    @map("tenant_id")
  userId     String    @map("user_id")
  type       String // see src/lib/events.ts EVENT_TYPES
  title      String
  message    String
  entityType String?   @map("entity_type")
  entityId   String?   @map("entity_id")
  link       String?
  readAt     DateTime? @map("read_at")
  emailedAt  DateTime? @map("emailed_at")
  createdAt  DateTime  @default(now()) @map("created_at")

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

  @@index([tenantId, userId, readAt])
  @@map("notifications")
}

// ---------- Offline sync ----------

enum SyncOpStatus {
  applied
  conflict
  rejected
}

model SyncOperation {
  id              String       @id @default(cuid())
  tenantId        String       @map("tenant_id")
  userId          String       @map("user_id")
  clientOpId      String       @map("client_op_id") // idempotency key from device
  opType          String       @map("op_type")
  entityType      String?      @map("entity_type")
  entityId        String?      @map("entity_id")
  baseVersion     Int?         @map("base_version")
  payload         Json
  status          SyncOpStatus
  result          Json?
  errorCode       String?      @map("error_code")
  clientCreatedAt DateTime     @map("client_created_at")
  receivedAt      DateTime     @default(now()) @map("received_at")
  resolvedById    String?      @map("resolved_by_id")
  resolvedAt      DateTime?    @map("resolved_at")

  @@unique([tenantId, clientOpId])
  @@index([tenantId, status])
  @@map("sync_operations")
}

// ---------- Lotse (AI) ----------

model AiGeneration {
  id           String   @id @default(cuid())
  tenantId     String   @map("tenant_id")
  kind         String // report_draft | voice_summary | completeness_check | import_extraction
  provider     String
  model        String
  entityType   String?  @map("entity_type")
  entityId     String?  @map("entity_id")
  input        Json?
  output       Json?
  inputTokens  Int?     @map("input_tokens")
  outputTokens Int?     @map("output_tokens")
  createdById  String?  @map("created_by_id")
  createdAt    DateTime @default(now()) @map("created_at")

  @@index([tenantId, entityType, entityId])
  @@map("ai_generations")
}