// Z.CRM - Complete Database Schema
// مجموعة أتمتة - نظام إدارة شامل

generator client {
  provider = "prisma-client-js"
  binaryTargets = ["native", "linux-musl-openssl-3.0.x"]
}

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

// ============================================
// CORE MODELS - الموديولات الأساسية
// ============================================

// Audit Log - سجل التدقيق
model AuditLog {
  id          String   @id @default(uuid())
  entityType  String   // Contact, Deal, Invoice, etc.
  entityId    String
  action      String   // CREATE, UPDATE, DELETE, MERGE, APPROVE, etc.
  userId      String
  user        User     @relation(fields: [userId], references: [id])
  changes     Json?    // Before/After data
  ipAddress   String?
  userAgent   String?
  reason      String?  // Required for sensitive operations
  createdAt   DateTime @default(now())

  @@index([entityType, entityId])
  @@index([userId])
  @@index([createdAt])
  @@map("audit_logs")
}

// ============================================
// MODULE 5: HR MANAGEMENT (BASE MODULE)
// Must be defined first as it controls all access
// ============================================

model User {
  id                String    @id @default(uuid())
  email             String    @unique
  username          String    @unique
  password          String
  isActive          Boolean   @default(true)
  lastLogin         DateTime?
  failedLoginAttempts Int     @default(0)
  lockedUntil       DateTime?
  
  // Link to Employee
  employeeId        String?   @unique
  employee          Employee? @relation(fields: [employeeId], references: [id])
  
  // Security
  refreshToken      String?
  passwordResetToken String?
  passwordResetExpires DateTime?
  
  createdAt         DateTime  @default(now())
  updatedAt         DateTime  @updatedAt
  
  // Relations
  auditLogs         AuditLog[]
  createdContacts   Contact[] @relation("CreatedByUser")
  ownedDeals        Deal[]
  assignedTasks     Task[]
  projectMembers    ProjectMember[]
  campaigns         Campaign[]
  
  @@map("users")
}

model Employee {
  id                String    @id @default(uuid())
  uniqueEmployeeId  String    @unique // رقم الموظف الموحد
  
  // Personal Info
  firstName         String
  lastName          String
  firstNameAr       String?
  lastNameAr        String?
  email             String    @unique
  phone             String?
  mobile            String
  dateOfBirth       DateTime?
  gender            String?
  nationality       String?
  nationalId        String?   @unique
  passportNumber    String?
  
  // Employment Info
  employmentType    String    // Full-time, Part-time, Contract
  contractType      String?   // Fixed, Unlimited
  hireDate          DateTime
  endDate           DateTime?
  probationEndDate  DateTime?
  
  // Position & Structure
  departmentId      String
  department        Department @relation(fields: [departmentId], references: [id])
  positionId        String
  position          Position   @relation(fields: [positionId], references: [id])
  reportingToId     String?
  reportingTo       Employee?  @relation("ReportsTo", fields: [reportingToId], references: [id])
  directReports     Employee[] @relation("ReportsTo")
  
  // Compensation
  basicSalary       Decimal   @db.Decimal(12, 2)
  currency          String    @default("SAR")
  
  // Status
  status            String    @default("ACTIVE") // ACTIVE, ON_LEAVE, SUSPENDED, TERMINATED
  terminationDate   DateTime?
  terminationReason String?
  
  // Emergency Contact
  emergencyContactName  String?
  emergencyContactPhone String?
  emergencyContactRelation String?
  
  // Address
  address           String?
  city              String?
  country           String?
  
  // Documents
  documents         Json?     // Array of document references
  
  createdAt         DateTime  @default(now())
  updatedAt         DateTime  @updatedAt
  
  // Relations
  user              User?
  attendances       Attendance[]
  leaves            Leave[]
  salaries          Salary[]
  evaluations       PerformanceEvaluation[]
  trainings         EmployeeTraining[]
  disciplinaryActions DisciplinaryAction[]
  allowances        Allowance[]
  commissions       Commission[]
  
  @@index([departmentId])
  @@index([positionId])
  @@index([status])
  @@map("employees")
}

model Department {
  id            String      @id @default(uuid())
  name          String
  nameAr        String?
  code          String      @unique
  parentId      String?
  parent        Department? @relation("DepartmentHierarchy", fields: [parentId], references: [id])
  children      Department[] @relation("DepartmentHierarchy")
  description   String?
  isActive      Boolean     @default(true)
  
  createdAt     DateTime    @default(now())
  updatedAt     DateTime    @updatedAt
  
  employees     Employee[]
  positions     Position[]
  
  @@map("departments")
}

model Position {
  id            String      @id @default(uuid())
  title         String
  titleAr       String?
  code          String      @unique
  departmentId  String
  department    Department  @relation(fields: [departmentId], references: [id])
  level         Int         // Management level
  description   String?
  responsibilities Json?
  requirements  Json?
  isActive      Boolean     @default(true)
  
  createdAt     DateTime    @default(now())
  updatedAt     DateTime    @updatedAt
  
  employees     Employee[]
  permissions   PositionPermission[]
  
  @@index([departmentId])
  @@map("positions")
}

model PositionPermission {
  id            String   @id @default(uuid())
  positionId    String
  position      Position @relation(fields: [positionId], references: [id])
  module        String   // contacts, crm, inventory, etc.
  resource      String   // contacts, deals, quotes, etc.
  actions       Json     // [create, read, update, delete, approve, etc.]
  conditions    Json?    // Additional conditions
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@unique([positionId, module, resource])
  @@map("position_permissions")
}

model Attendance {
  id            String   @id @default(uuid())
  employeeId    String
  employee      Employee @relation(fields: [employeeId], references: [id])
  date          DateTime @db.Date
  checkIn       DateTime?
  checkOut      DateTime?
  workHours     Decimal? @db.Decimal(5, 2)
  overtimeHours Decimal? @db.Decimal(5, 2)
  status        String   // PRESENT, ABSENT, LATE, HALF_DAY, etc.
  notes         String?
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@unique([employeeId, date])
  @@index([employeeId])
  @@index([date])
  @@map("attendances")
}

model Leave {
  id            String   @id @default(uuid())
  employeeId    String
  employee      Employee @relation(fields: [employeeId], references: [id])
  leaveType     String   // ANNUAL, SICK, UNPAID, EMERGENCY, etc.
  startDate     DateTime @db.Date
  endDate       DateTime @db.Date
  days          Int
  reason        String?
  status        String   @default("PENDING") // PENDING, APPROVED, REJECTED
  approvedBy    String?
  approvedAt    DateTime?
  rejectedReason String?
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@index([employeeId])
  @@index([status])
  @@map("leaves")
}

model Salary {
  id            String   @id @default(uuid())
  employeeId    String
  employee      Employee @relation(fields: [employeeId], references: [id])
  month         Int
  year          Int
  basicSalary   Decimal  @db.Decimal(12, 2)
  allowances    Decimal  @db.Decimal(12, 2)
  deductions    Decimal  @db.Decimal(12, 2)
  commissions   Decimal  @db.Decimal(12, 2)
  overtimePay   Decimal  @db.Decimal(12, 2)
  netSalary     Decimal  @db.Decimal(12, 2)
  status        String   @default("PENDING") // PENDING, APPROVED, PAID
  paidDate      DateTime?
  notes         String?
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@unique([employeeId, month, year])
  @@index([employeeId])
  @@map("salaries")
}

model Allowance {
  id            String   @id @default(uuid())
  employeeId    String
  employee      Employee @relation(fields: [employeeId], references: [id])
  type          String   // HOUSING, TRANSPORT, FOOD, etc.
  amount        Decimal  @db.Decimal(12, 2)
  isRecurring   Boolean  @default(false)
  startDate     DateTime @db.Date
  endDate       DateTime? @db.Date
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@index([employeeId])
  @@map("allowances")
}

model Commission {
  id            String   @id @default(uuid())
  employeeId    String
  employee      Employee @relation(fields: [employeeId], references: [id])
  dealId        String?
  deal          Deal?    @relation(fields: [dealId], references: [id])
  amount        Decimal  @db.Decimal(12, 2)
  percentage    Decimal? @db.Decimal(5, 2)
  month         Int
  year          Int
  status        String   @default("PENDING") // PENDING, APPROVED, PAID
  notes         String?
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@index([employeeId])
  @@index([dealId])
  @@map("commissions")
}

model PerformanceEvaluation {
  id            String   @id @default(uuid())
  employeeId    String
  employee      Employee @relation(fields: [employeeId], references: [id])
  evaluationPeriod String // Q1-2024, 2024, etc.
  kpis          Json     // Array of KPI scores
  overallScore  Decimal  @db.Decimal(5, 2)
  comments      String?
  evaluatedBy   String
  evaluatedAt   DateTime
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@index([employeeId])
  @@map("performance_evaluations")
}

model EmployeeTraining {
  id            String   @id @default(uuid())
  employeeId    String
  employee      Employee @relation(fields: [employeeId], references: [id])
  trainingName  String
  trainingType  String   // INTERNAL, EXTERNAL, ONLINE
  provider      String?
  startDate     DateTime @db.Date
  endDate       DateTime @db.Date
  cost          Decimal? @db.Decimal(12, 2)
  status        String   @default("PLANNED") // PLANNED, COMPLETED, CANCELLED
  certificate   String?
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@index([employeeId])
  @@map("employee_trainings")
}

model DisciplinaryAction {
  id            String   @id @default(uuid())
  employeeId    String
  employee      Employee @relation(fields: [employeeId], references: [id])
  type          String   // WARNING, SUSPENSION, TERMINATION
  reason        String
  description   String
  actionDate    DateTime @db.Date
  issuedBy      String
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@index([employeeId])
  @@map("disciplinary_actions")
}

// ============================================
// MODULE 1: CONTACT MANAGEMENT
// ============================================

model Contact {
  id                String    @id @default(uuid())
  uniqueContactId   String    @unique // رقم تعريفي موحد
  
  // Basic Info
  type              String    // INDIVIDUAL, COMPANY, HOLDING, GOVERNMENT
  name              String
  nameAr            String?
  email             String?
  phone             String?
  mobile            String?
  website           String?
  
  // Company/Entity Info
  companyName       String?
  companyNameAr     String?
  taxNumber         String?   @unique
  commercialRegister String?  @unique
  
  // Address
  address           String?
  city              String?
  country           String?
  postalCode        String?
  
  // Classification
  categories        ContactCategory[]
  tags              String[]
  
  // Hierarchy - for companies/entities
  parentId          String?
  parent            Contact?  @relation("ContactHierarchy", fields: [parentId], references: [id])
  children          Contact[] @relation("ContactHierarchy")
  
  // Relationship
  primaryContactId  String?   // For individuals in companies
  
  // Source & Status
  source            String    // EXHIBITION, VISIT, CALL, WEBSITE, REFERRAL, etc.
  status            String    @default("ACTIVE") // ACTIVE, INACTIVE, ARCHIVED, BLOCKED
  
  // Rating & Scoring
  rating            Int?      @db.SmallInt // Manual rating 1-5
  score             Decimal?  @db.Decimal(5, 2) // Auto scoring
  
  // Custom Fields
  customFields      Json?
  
  // Metadata
  createdById       String
  createdBy         User      @relation("CreatedByUser", fields: [createdById], references: [id])
  createdAt         DateTime  @default(now())
  updatedAt         DateTime  @updatedAt
  archivedAt        DateTime?
  
  // Relations
  relationships     ContactRelationship[] @relation("FromContact")
  relatedTo         ContactRelationship[] @relation("ToContact")
  activities        Activity[]
  deals             Deal[]
  attachments       Attachment[]
  notes             Note[]
  
  @@index([type])
  @@index([status])
  @@index([email])
  @@index([phone])
  @@index([mobile])
  @@index([taxNumber])
  @@index([commercialRegister])
  @@map("contacts")
}

model ContactCategory {
  id            String   @id @default(uuid())
  name          String
  nameAr        String?
  parentId      String?
  parent        ContactCategory? @relation("CategoryHierarchy", fields: [parentId], references: [id])
  children      ContactCategory[] @relation("CategoryHierarchy")
  description   String?
  isActive      Boolean  @default(true)
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  contacts      Contact[]
  
  @@map("contact_categories")
}

model ContactRelationship {
  id            String   @id @default(uuid())
  fromContactId String
  fromContact   Contact  @relation("FromContact", fields: [fromContactId], references: [id])
  toContactId   String
  toContact     Contact  @relation("ToContact", fields: [toContactId], references: [id])
  type          String   // REPRESENTATIVE, PARTNER, SUPPLIER, EMPLOYEE, etc.
  startDate     DateTime @db.Date
  endDate       DateTime? @db.Date
  isActive      Boolean  @default(true)
  notes         String?
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@unique([fromContactId, toContactId, type])
  @@index([fromContactId])
  @@index([toContactId])
  @@map("contact_relationships")
}

// ============================================
// MODULE 2: CRM
// ============================================

model Deal {
  id                String    @id @default(uuid())
  dealNumber        String    @unique
  name              String
  
  // Contact & Type
  contactId         String
  contact           Contact   @relation(fields: [contactId], references: [id])
  structure         String    // B2B, B2C, B2G, PARTNERSHIP
  
  // Pipeline & Stage
  pipelineId        String
  pipeline          Pipeline  @relation(fields: [pipelineId], references: [id])
  stage             String    // OPEN, NEGOTIATION, PENDING_INTERNAL, PENDING_CLIENT, WON, LOST, ON_HOLD
  
  // Values
  estimatedValue    Decimal   @db.Decimal(15, 2)
  actualValue       Decimal?  @db.Decimal(15, 2)
  currency          String    @default("SAR")
  probability       Int?      @db.SmallInt // 0-100
  
  // Dates
  expectedCloseDate DateTime? @db.Date
  actualCloseDate   DateTime? @db.Date
  
  // Assignment
  ownerId           String
  owner             User      @relation(fields: [ownerId], references: [id])
  
  // Win/Loss
  wonReason         String?
  lostReason        String?
  
  // Fiscal Year
  fiscalYear        Int
  
  // Status
  status            String    @default("ACTIVE") // ACTIVE, WON, LOST, CANCELLED, ARCHIVED
  
  createdAt         DateTime  @default(now())
  updatedAt         DateTime  @updatedAt
  
  // Relations
  quotes            Quote[]
  costSheets        CostSheet[]
  activities        Activity[]
  attachments       Attachment[]
  notes             Note[]
  contracts         Contract[]
  invoices          Invoice[]
  commissions       Commission[]
  
  @@index([contactId])
  @@index([ownerId])
  @@index([pipelineId])
  @@index([stage])
  @@index([status])
  @@index([fiscalYear])
  @@map("deals")
}

model Pipeline {
  id            String   @id @default(uuid())
  name          String
  nameAr        String?
  structure     String   // B2B, B2C, B2G, PARTNERSHIP
  stages        Json     // Array of stage definitions
  isActive      Boolean  @default(true)
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  deals         Deal[]
  
  @@map("pipelines")
}

model Quote {
  id            String   @id @default(uuid())
  quoteNumber   String   @unique
  dealId        String
  deal          Deal     @relation(fields: [dealId], references: [id])
  version       Int      @default(1)
  
  // Items
  items         Json     // Array of quote items
  
  // Pricing
  subtotal      Decimal  @db.Decimal(15, 2)
  discountType  String?  // PERCENTAGE, FIXED
  discountValue Decimal? @db.Decimal(15, 2)
  taxRate       Decimal  @db.Decimal(5, 2)
  taxAmount     Decimal  @db.Decimal(15, 2)
  total         Decimal  @db.Decimal(15, 2)
  
  // Terms
  validUntil    DateTime @db.Date
  paymentTerms  String?
  deliveryTerms String?
  notes         String?
  
  // Status & Approval
  status        String   @default("DRAFT") // DRAFT, SENT, VIEWED, APPROVED, REJECTED
  sentAt        DateTime?
  viewedAt      DateTime?
  approvedBy    String?
  approvedAt    DateTime?
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@index([dealId])
  @@map("quotes")
}

model CostSheet {
  id            String   @id @default(uuid())
  costSheetNumber String @unique
  dealId        String
  deal          Deal     @relation(fields: [dealId], references: [id])
  version       Int      @default(1)
  
  // Cost Items
  items         Json     // Array of cost items with sources
  
  // Totals
  totalCost     Decimal  @db.Decimal(15, 2)
  suggestedPrice Decimal @db.Decimal(15, 2)
  profitMargin  Decimal  @db.Decimal(5, 2)
  
  // Approval
  status        String   @default("DRAFT") // DRAFT, APPROVED, REJECTED
  approvedBy    String?
  approvedAt    DateTime?
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@index([dealId])
  @@map("cost_sheets")
}

model Contract {
  id            String   @id @default(uuid())
  contractNumber String  @unique
  dealId        String
  deal          Deal     @relation(fields: [dealId], references: [id])
  version       Int      @default(1)
  
  title         String
  type          String   // SALES, SERVICE, MAINTENANCE, etc.
  
  // Parties
  clientInfo    Json
  companyInfo   Json
  
  // Terms
  startDate     DateTime @db.Date
  endDate       DateTime? @db.Date
  value         Decimal  @db.Decimal(15, 2)
  paymentTerms  Json
  deliveryTerms Json
  terms         String
  
  // Status
  status        String   @default("DRAFT") // DRAFT, PENDING_SIGNATURE, ACTIVE, EXPIRED, TERMINATED
  signedAt      DateTime?
  
  // Documents
  documentUrl   String?
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@index([dealId])
  @@map("contracts")
}

model Invoice {
  id            String   @id @default(uuid())
  invoiceNumber String   @unique
  dealId        String?
  deal          Deal?    @relation(fields: [dealId], references: [id])
  
  // Items
  items         Json
  
  // Pricing
  subtotal      Decimal  @db.Decimal(15, 2)
  taxAmount     Decimal  @db.Decimal(15, 2)
  total         Decimal  @db.Decimal(15, 2)
  
  // Payment
  status        String   @default("DRAFT") // DRAFT, SENT, PAID, OVERDUE, CANCELLED
  dueDate       DateTime @db.Date
  paidDate      DateTime?
  paidAmount    Decimal? @db.Decimal(15, 2)
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@index([dealId])
  @@index([status])
  @@map("invoices")
}

// ============================================
// MODULE 3: INVENTORY & ASSETS
// ============================================

model Warehouse {
  id            String   @id @default(uuid())
  code          String   @unique
  name          String
  nameAr        String?
  type          String   // MAIN, BRANCH, PROJECT, VIRTUAL
  
  // Location
  address       String?
  city          String?
  country       String?
  
  // Parent for hierarchy
  parentId      String?
  parent        Warehouse? @relation("WarehouseHierarchy", fields: [parentId], references: [id])
  children      Warehouse[] @relation("WarehouseHierarchy")
  
  // Manager
  managerId     String?
  
  isActive      Boolean  @default(true)
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  // Relations
  items         InventoryItem[]
  movements     InventoryMovement[]
  transfers     WarehouseTransfer[] @relation("FromWarehouse")
  receivedTransfers WarehouseTransfer[] @relation("ToWarehouse")
  
  @@map("warehouses")
}

model Product {
  id            String   @id @default(uuid())
  sku           String   @unique
  name          String
  nameAr        String?
  description   String?
  
  // Category
  categoryId    String
  category      ProductCategory @relation(fields: [categoryId], references: [id])
  
  // Properties
  brand         String?
  model         String?
  specifications Json?
  
  // Tracking
  trackBy       String   @default("QUANTITY") // QUANTITY, SERIAL, BATCH
  
  // Pricing
  costPrice     Decimal  @db.Decimal(12, 2)
  sellingPrice  Decimal  @db.Decimal(12, 2)
  
  // Stock
  minStock      Int      @default(0)
  maxStock      Int?
  reorderPoint  Int?
  
  // Unit
  unit          String   // PCS, KG, LITER, etc.
  
  isActive      Boolean  @default(true)
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  // Relations
  inventoryItems InventoryItem[]
  movements     InventoryMovement[]
  
  @@index([categoryId])
  @@index([sku])
  @@map("products")
}

model ProductCategory {
  id            String   @id @default(uuid())
  name          String
  nameAr        String?
  code          String   @unique
  parentId      String?
  parent        ProductCategory? @relation("CategoryHierarchy", fields: [parentId], references: [id])
  children      ProductCategory[] @relation("CategoryHierarchy")
  description   String?
  isActive      Boolean  @default(true)
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  products      Product[]
  
  @@map("product_categories")
}

model InventoryItem {
  id            String    @id @default(uuid())
  warehouseId   String
  warehouse     Warehouse @relation(fields: [warehouseId], references: [id])
  productId     String
  product       Product   @relation(fields: [productId], references: [id])
  
  quantity      Int
  reservedQty   Int       @default(0)
  availableQty  Int       // quantity - reservedQty
  
  // Location in warehouse
  location      String?
  
  // Value
  averageCost   Decimal   @db.Decimal(12, 2)
  totalValue    Decimal   @db.Decimal(15, 2)
  
  lastUpdated   DateTime  @default(now())
  
  @@unique([warehouseId, productId])
  @@index([warehouseId])
  @@index([productId])
  @@map("inventory_items")
}

model InventoryMovement {
  id            String    @id @default(uuid())
  warehouseId   String
  warehouse     Warehouse @relation(fields: [warehouseId], references: [id])
  productId     String
  product       Product   @relation(fields: [productId], references: [id])
  
  type          String    // IN, OUT, ADJUST, TRANSFER
  quantity      Int
  
  // Reference
  referenceType String?   // PURCHASE, SALE, TRANSFER, PROJECT, etc.
  referenceId   String?
  
  // Pricing
  unitCost      Decimal?  @db.Decimal(12, 2)
  totalCost     Decimal?  @db.Decimal(15, 2)
  
  // Serial/Batch
  serialNumber  String?
  batchNumber   String?
  
  notes         String?
  
  createdAt     DateTime  @default(now())
  
  @@index([warehouseId])
  @@index([productId])
  @@index([type])
  @@index([createdAt])
  @@map("inventory_movements")
}

model WarehouseTransfer {
  id            String    @id @default(uuid())
  transferNumber String   @unique
  fromWarehouseId String
  fromWarehouse Warehouse @relation("FromWarehouse", fields: [fromWarehouseId], references: [id])
  toWarehouseId String
  toWarehouse   Warehouse @relation("ToWarehouse", fields: [toWarehouseId], references: [id])
  
  items         Json      // Array of items with quantities
  
  status        String    @default("PENDING") // PENDING, APPROVED, IN_TRANSIT, RECEIVED, CANCELLED
  requestedBy   String
  approvedBy    String?
  approvedAt    DateTime?
  shippedAt     DateTime?
  receivedAt    DateTime?
  
  notes         String?
  
  createdAt     DateTime  @default(now())
  updatedAt     DateTime  @updatedAt
  
  @@index([fromWarehouseId])
  @@index([toWarehouseId])
  @@index([status])
  @@map("warehouse_transfers")
}

model Asset {
  id            String   @id @default(uuid())
  assetNumber   String   @unique
  name          String
  type          String   // EQUIPMENT, VEHICLE, FURNITURE, IT, etc.
  
  // Purchase Info
  purchaseDate  DateTime @db.Date
  purchasePrice Decimal  @db.Decimal(15, 2)
  supplier      String?
  invoiceNumber String?
  
  // Depreciation
  depreciationMethod String? // STRAIGHT_LINE, DECLINING_BALANCE
  usefulLife    Int?     // in years
  residualValue Decimal? @db.Decimal(15, 2)
  currentValue  Decimal  @db.Decimal(15, 2)
  
  // Assignment
  assignedTo    String?  // Employee ID
  assignedDate  DateTime? @db.Date
  department    String?
  location      String?
  
  // Maintenance
  lastMaintenanceDate DateTime? @db.Date
  nextMaintenanceDate DateTime? @db.Date
  
  // Status
  status        String   @default("ACTIVE") // ACTIVE, IN_USE, MAINTENANCE, RETIRED, DISPOSED
  
  // Additional Info
  serialNumber  String?
  model         String?
  manufacturer  String?
  warranty      String?
  notes         String?
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  maintenances  AssetMaintenance[]
  
  @@map("assets")
}

model AssetMaintenance {
  id            String   @id @default(uuid())
  assetId       String
  asset         Asset    @relation(fields: [assetId], references: [id])
  
  type          String   // PREVENTIVE, CORRECTIVE, EMERGENCY
  description   String
  cost          Decimal? @db.Decimal(12, 2)
  performedBy   String?
  performedDate DateTime @db.Date
  
  nextScheduledDate DateTime? @db.Date
  
  notes         String?
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@index([assetId])
  @@map("asset_maintenances")
}

// ============================================
// MODULE 4: TASKS & PROJECTS
// ============================================

model Project {
  id            String   @id @default(uuid())
  projectNumber String   @unique
  name          String
  description   String?
  
  // Type & Source
  type          String   // INTERNAL, CLIENT, IMPLEMENTATION, MAINTENANCE, GOVERNMENT
  dealId        String?
  
  // Client
  clientId      String?
  
  // Dates
  startDate     DateTime @db.Date
  endDate       DateTime? @db.Date
  actualEndDate DateTime? @db.Date
  
  // Budget
  estimatedCost Decimal? @db.Decimal(15, 2)
  actualCost    Decimal? @db.Decimal(15, 2)
  
  // Progress
  progress      Int      @default(0) // 0-100
  
  // Status
  status        String   @default("PLANNING") // PLANNING, ACTIVE, ON_HOLD, COMPLETED, CANCELLED
  priority      String   @default("MEDIUM") // LOW, MEDIUM, HIGH, URGENT
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  // Relations
  phases        ProjectPhase[]
  tasks         Task[]
  members       ProjectMember[]
  expenses      ProjectExpense[]
  attachments   Attachment[]
  notes         Note[]
  
  @@map("projects")
}

model ProjectPhase {
  id            String   @id @default(uuid())
  projectId     String
  project       Project  @relation(fields: [projectId], references: [id])
  name          String
  description   String?
  order         Int
  
  startDate     DateTime @db.Date
  endDate       DateTime @db.Date
  
  status        String   @default("PENDING") // PENDING, IN_PROGRESS, COMPLETED
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  tasks         Task[]
  
  @@index([projectId])
  @@map("project_phases")
}

model Task {
  id            String   @id @default(uuid())
  taskNumber    String   @unique
  projectId     String?
  project       Project? @relation(fields: [projectId], references: [id])
  phaseId       String?
  phase         ProjectPhase? @relation(fields: [phaseId], references: [id])
  
  // Hierarchy
  parentId      String?
  parent        Task?    @relation("TaskHierarchy", fields: [parentId], references: [id])
  children      Task[]   @relation("TaskHierarchy")
  
  title         String
  description   String?
  
  // Assignment
  assignedToId  String?
  assignedTo    User?    @relation(fields: [assignedToId], references: [id])
  
  // Dates & Time
  startDate     DateTime? @db.Date
  dueDate       DateTime? @db.Date
  completedDate DateTime? @db.Date
  estimatedHours Decimal? @db.Decimal(8, 2)
  actualHours   Decimal? @db.Decimal(8, 2)
  
  // Status & Priority
  status        String   @default("TODO") // TODO, IN_PROGRESS, REVIEW, COMPLETED, CANCELLED
  priority      String   @default("MEDIUM")
  progress      Int      @default(0)
  
  // Dependencies
  dependencies  Json?    // Array of task IDs this depends on
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  activities    Activity[]
  attachments   Attachment[]
  
  @@index([projectId])
  @@index([phaseId])
  @@index([assignedToId])
  @@index([status])
  @@map("tasks")
}

model ProjectMember {
  id            String   @id @default(uuid())
  projectId     String
  project       Project  @relation(fields: [projectId], references: [id])
  userId        String
  user          User     @relation(fields: [userId], references: [id])
  role          String   // MANAGER, MEMBER, VIEWER
  
  joinedAt      DateTime @default(now())
  leftAt        DateTime?
  
  @@unique([projectId, userId])
  @@index([projectId])
  @@index([userId])
  @@map("project_members")
}

model ProjectExpense {
  id            String   @id @default(uuid())
  projectId     String
  project       Project  @relation(fields: [projectId], references: [id])
  
  category      String
  description   String
  amount        Decimal  @db.Decimal(12, 2)
  date          DateTime @db.Date
  
  receipt       String?
  status        String   @default("PENDING") // PENDING, APPROVED, REJECTED
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@index([projectId])
  @@map("project_expenses")
}

// ============================================
// MODULE 6: MARKETING
// ============================================

model Campaign {
  id            String   @id @default(uuid())
  campaignNumber String  @unique
  name          String
  nameAr        String?
  type          String   // EMAIL, WHATSAPP, SOCIAL, EXHIBITION, MULTI_CHANNEL
  
  // Content
  description   String?
  content       Json?    // Templates, messages, etc.
  
  // Targeting
  targetAudience Json?
  
  // Budget & ROI
  budget        Decimal? @db.Decimal(15, 2)
  actualCost    Decimal? @db.Decimal(15, 2)
  expectedROI   Decimal? @db.Decimal(15, 2)
  actualROI     Decimal? @db.Decimal(15, 2)
  
  // Dates
  startDate     DateTime @db.Date
  endDate       DateTime? @db.Date
  
  // Status & Approval
  status        String   @default("DRAFT") // DRAFT, PENDING_APPROVAL, APPROVED, SCHEDULED, RUNNING, COMPLETED, CANCELLED
  approvedBy    String?
  approvedAt    DateTime?
  
  // Owner
  ownerId       String
  owner         User     @relation(fields: [ownerId], references: [id])
  
  // Metrics
  sentCount     Int      @default(0)
  openRate      Decimal? @db.Decimal(5, 2)
  clickRate     Decimal? @db.Decimal(5, 2)
  responseRate  Decimal? @db.Decimal(5, 2)
  leadsGenerated Int     @default(0)
  conversions   Int      @default(0)
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  // Relations
  activities    Activity[]
  
  @@index([ownerId])
  @@index([type])
  @@index([status])
  @@map("campaigns")
}

// ============================================
// SHARED MODELS - نماذج مشتركة
// ============================================

model Activity {
  id            String   @id @default(uuid())
  type          String   // CALL, MEETING, EMAIL, WHATSAPP, NOTE, etc.
  
  // Related Entity
  entityType    String   // CONTACT, DEAL, TASK, PROJECT, CAMPAIGN
  entityId      String
  
  // Relations (optional, for better querying)
  contactId     String?
  contact       Contact? @relation(fields: [contactId], references: [id])
  dealId        String?
  deal          Deal?    @relation(fields: [dealId], references: [id])
  taskId        String?
  task          Task?    @relation(fields: [taskId], references: [id])
  campaignId    String?
  campaign      Campaign? @relation(fields: [campaignId], references: [id])
  
  // Content
  title         String
  description   String?
  
  // Date & Time
  scheduledAt   DateTime?
  completedAt   DateTime?
  duration      Int?     // in minutes
  
  // Status
  status        String   @default("PLANNED") // PLANNED, COMPLETED, CANCELLED
  
  // Participants
  participants  Json?
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@index([entityType, entityId])
  @@index([contactId])
  @@index([dealId])
  @@index([taskId])
  @@index([type])
  @@map("activities")
}

model Note {
  id            String   @id @default(uuid())
  
  // Related Entity
  entityType    String
  entityId      String
  
  // Relations
  contactId     String?
  contact       Contact? @relation(fields: [contactId], references: [id])
  dealId        String?
  deal          Deal?    @relation(fields: [dealId], references: [id])
  projectId     String?
  project       Project? @relation(fields: [projectId], references: [id])
  
  content       String
  isPinned      Boolean  @default(false)
  
  createdBy     String
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@index([entityType, entityId])
  @@index([contactId])
  @@index([dealId])
  @@index([projectId])
  @@map("notes")
}

model Attachment {
  id            String   @id @default(uuid())
  
  // Related Entity
  entityType    String
  entityId      String
  
  // Relations
  contactId     String?
  contact       Contact? @relation(fields: [contactId], references: [id])
  dealId        String?
  deal          Deal?    @relation(fields: [dealId], references: [id])
  projectId     String?
  project       Project? @relation(fields: [projectId], references: [id])
  taskId        String?
  task          Task?    @relation(fields: [taskId], references: [id])
  
  // File Info
  fileName      String
  originalName  String
  mimeType      String
  size          Int
  path          String
  url           String?
  
  // Metadata
  description   String?
  category      String?
  
  uploadedBy    String
  uploadedAt    DateTime @default(now())
  
  @@index([entityType, entityId])
  @@index([contactId])
  @@index([dealId])
  @@index([projectId])
  @@index([taskId])
  @@map("attachments")
}

model CustomField {
  id            String   @id @default(uuid())
  module        String   // contacts, crm, inventory, etc.
  entityType    String   // Contact, Deal, Product, etc.
  name          String
  nameAr        String?
  fieldType     String   // TEXT, NUMBER, DATE, SELECT, MULTISELECT, BOOLEAN
  options       Json?    // For SELECT/MULTISELECT
  isRequired    Boolean  @default(false)
  isActive      Boolean  @default(true)
  order         Int      @default(0)
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@unique([module, entityType, name])
  @@map("custom_fields")
}

model Notification {
  id            String   @id @default(uuid())
  userId        String
  type          String   // TASK_ASSIGNED, DEAL_STAGE_CHANGED, APPROVAL_PENDING, etc.
  title         String
  message       String
  entityType    String?
  entityId      String?
  isRead        Boolean  @default(false)
  readAt        DateTime?
  
  createdAt     DateTime @default(now())
  
  @@index([userId, isRead])
  @@index([createdAt])
  @@map("notifications")
}

model Approval {
  id            String   @id @default(uuid())
  entityType    String   // QUOTE, DEAL, CONTRACT, TRANSFER, etc.
  entityId      String
  type          String   // PRICE_APPROVAL, DISCOUNT_APPROVAL, etc.
  
  requestedBy   String
  requestedAt   DateTime @default(now())
  
  approverLevel Int      // For multi-level approvals
  approverId    String
  
  status        String   @default("PENDING") // PENDING, APPROVED, REJECTED
  comments      String?
  respondedAt   DateTime?
  
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt
  
  @@index([entityType, entityId])
  @@index([approverId, status])
  @@map("approvals")
}