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

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

enum UserRole {
  SYSTEM_ADMIN
  BUSINESS_OWNER
  STAFF
  AUDITOR
}

enum ReceiptStatus {
  PENDING
  VERIFIED
  REJECTED
  FAILED
}

enum PaymentMethod {
  CASH
  CARD
  MOBILE
  OTHER
}

model User {
  id            String    @id @default(uuid())
  telegramId    String?   @unique @map("telegram_id")
  externalId    String?   @unique @map("external_id")
  email         String?   @unique
  username      String?
  role          UserRole
  passwordHash  String?   @map("password_hash")
  isActive      Boolean   @default(true) @map("is_active")
  
  // Relations
  ownerId       String?   @map("owner_id")
  owner         User?     @relation("OwnerStaff", fields: [ownerId], references: [id])
  staff         User[]    @relation("OwnerStaff")
  
  receipts      Receipt[]
  verifications Verification[]
  
  createdAt     DateTime  @default(now()) @map("created_at")
  updatedAt     DateTime  @updatedAt @map("updated_at")
  
  @@map("users")
  @@index([telegramId])
  @@index([externalId])
  @@index([role])
}

model Receipt {
  id              String          @id @default(uuid())
  userId          String          @map("user_id")
  user            User            @relation(fields: [userId], references: [id])
  
  // Receipt data
  imageUrl        String          @map("image_url")
  transactionId   String?         @map("transaction_id")
  merchant        String?
  date            DateTime?
  amount          Float?
  paymentMethod   PaymentMethod?  @map("payment_method")
  
  // OCR & Status
  status          ReceiptStatus   @default(PENDING)
  ocrProcessed    Boolean         @default(false) @map("ocr_processed")
  ocrError        String?         @map("ocr_error")
  ocrProcessingTime Int?          @map("ocr_processing_time") // milliseconds
  
  // Verification
  isDuplicate     Boolean         @default(false) @map("is_duplicate")
  fraudFlags      String[]        @default([]) @map("fraud_flags")
  
  verifications   Verification[]
  
  createdAt       DateTime        @default(now()) @map("created_at")
  updatedAt       DateTime        @updatedAt @map("updated_at")
  
  @@map("receipts")
  @@index([userId])
  @@index([status])
  @@index([transactionId])
  @@index([createdAt])
}

model Verification {
  id          String    @id @default(uuid())
  receiptId   String    @map("receipt_id")
  receipt     Receipt   @relation(fields: [receiptId], references: [id])
  
  verifiedBy  String    @map("verified_by")
  verifier    User      @relation(fields: [verifiedBy], references: [id])
  
  status      ReceiptStatus
  notes       String?
  
  createdAt   DateTime  @default(now()) @map("created_at")
  
  @@map("verifications")
  @@index([receiptId])
  @@index([verifiedBy])
}

model PerformanceMetric {
  id                String    @id @default(uuid())
  date              DateTime  @default(now())
  
  // OCR Metrics
  ocrProcessingTime Float?    @map("ocr_processing_time") // average in ms
  ocrFailureRate    Float?    @map("ocr_failure_rate") // percentage
  
  // API Metrics
  apiResponseTime   Float?    @map("api_response_time") // average in ms
  apiRequestCount   Int?      @map("api_request_count")
  
  // System Usage
  dailyReceiptCount Int?      @map("daily_receipt_count")
  dailyUserCount    Int?      @map("daily_user_count")
  
  createdAt         DateTime  @default(now()) @map("created_at")
  
  @@map("performance_metrics")
  @@index([date])
}