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

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

/// *
///  * COMPANY  (multi-tenant root)
model Company {
  id              String           @id @default(uuid())
  name            String
  csvUrl          String
  csvUsername     String?
  csvPassword     String?
  sentimentAlert  Float?
  dashboardOpts   Json?
  createdAt       DateTime         @default(now())
  updatedAt       DateTime         @updatedAt
  companyAiModels CompanyAIModel[]
  sessions        Session[]
  imports         SessionImport[]
  users           User[]           @relation("CompanyUsers")
}

/// *
///  * USER  (auth accounts)
model User {
  id               String    @id @default(uuid())
  email            String    @unique
  password         String
  role             UserRole  @default(USER)
  companyId        String
  resetToken       String?
  resetTokenExpiry DateTime?
  createdAt        DateTime  @default(now())
  updatedAt        DateTime  @updatedAt
  company          Company   @relation("CompanyUsers", fields: [companyId], references: [id], onDelete: Cascade)
}

/// *
///  * 1.  Normalised session ---------------------------
model Session {
  id                   String                    @id @default(uuid())
  companyId            String
  importId             String?                   @unique
  /// *
  ///    * session-level data (processed from SessionImport)
  startTime            DateTime
  endTime              DateTime
  ipAddress            String?
  country              String?
  fullTranscriptUrl    String?
  avgResponseTime      Float?
  initialMsg           String?
  language             String?
  messagesSent         Int?
  sentiment            SentimentCategory?
  escalated            Boolean?
  forwardedHr          Boolean?
  category             SessionCategory?
  summary              String?
  createdAt            DateTime                  @default(now())
  updatedAt            DateTime                  @updatedAt
  aiProcessingRequests AIProcessingRequest[]
  messages             Message[]
  company              Company                   @relation(fields: [companyId], references: [id], onDelete: Cascade)
  import               SessionImport?            @relation("ImportToSession", fields: [importId], references: [id])
  processingStatus     SessionProcessingStatus[]
  sessionQuestions     SessionQuestion[]

  @@index([companyId, startTime])
}

/// *
///  * 2.  Raw CSV row (pure data storage) ----------
model SessionImport {
  id                     String   @id @default(uuid())
  companyId              String
  externalSessionId      String   @unique
  startTimeRaw           String
  endTimeRaw             String
  ipAddress              String?
  countryCode            String?
  language               String?
  messagesSent           Int?
  sentimentRaw           String?
  escalatedRaw           String?
  forwardedHrRaw         String?
  fullTranscriptUrl      String?
  avgResponseTimeSeconds Float?
  tokens                 Int?
  tokensEur              Float?
  category               String?
  initialMessage         String?
  rawTranscriptContent   String?
  createdAt              DateTime @default(now())
  session                Session? @relation("ImportToSession")
  company                Company  @relation(fields: [companyId], references: [id], onDelete: Cascade)

  @@unique([companyId, externalSessionId])
}

/// *
///  * MESSAGE  (individual lines)
model Message {
  id        String    @id @default(uuid())
  sessionId String
  timestamp DateTime?
  role      String
  content   String
  order     Int
  createdAt DateTime  @default(now())
  session   Session   @relation(fields: [sessionId], references: [id], onDelete: Cascade)

  @@unique([sessionId, order])
  @@index([sessionId, order])
}

/// *
///  * UNIFIED PROCESSING STATUS TRACKING
model SessionProcessingStatus {
  id           String           @id @default(uuid())
  sessionId    String
  stage        ProcessingStage
  status       ProcessingStatus @default(PENDING)
  startedAt    DateTime?
  completedAt  DateTime?
  errorMessage String?
  retryCount   Int              @default(0)
  metadata     Json?
  session      Session          @relation(fields: [sessionId], references: [id], onDelete: Cascade)

  @@unique([sessionId, stage])
  @@index([stage, status])
  @@index([sessionId])
}

/// *
///  * QUESTION MANAGEMENT (separate from Session for better analytics)
model Question {
  id               String            @id @default(uuid())
  content          String            @unique
  createdAt        DateTime          @default(now())
  sessionQuestions SessionQuestion[]
}

model SessionQuestion {
  id         String   @id @default(uuid())
  sessionId  String
  questionId String
  order      Int
  createdAt  DateTime @default(now())
  question   Question @relation(fields: [questionId], references: [id])
  session    Session  @relation(fields: [sessionId], references: [id], onDelete: Cascade)

  @@unique([sessionId, questionId])
  @@unique([sessionId, order])
  @@index([sessionId])
}

/// *
///  * AI PROCESSING COST TRACKING
model AIProcessingRequest {
  id                       String    @id @default(uuid())
  sessionId                String
  openaiRequestId          String?
  model                    String
  serviceTier              String?
  systemFingerprint        String?
  promptTokens             Int
  completionTokens         Int
  totalTokens              Int
  cachedTokens             Int?
  audioTokensPrompt        Int?
  reasoningTokens          Int?
  audioTokensCompletion    Int?
  acceptedPredictionTokens Int?
  rejectedPredictionTokens Int?
  promptTokenCost          Float
  completionTokenCost      Float
  totalCostEur             Float
  processingType           String
  success                  Boolean
  errorMessage             String?
  requestedAt              DateTime  @default(now())
  completedAt              DateTime?
  session                  Session   @relation(fields: [sessionId], references: [id], onDelete: Cascade)

  @@index([sessionId])
  @@index([requestedAt])
  @@index([model])
}

/// *
///  * AI Model definitions (without pricing)
model AIModel {
  id            String           @id @default(uuid())
  name          String           @unique
  provider      String
  maxTokens     Int?
  isActive      Boolean          @default(true)
  createdAt     DateTime         @default(now())
  updatedAt     DateTime         @updatedAt
  pricing       AIModelPricing[]
  companyModels CompanyAIModel[]

  @@index([provider, isActive])
}

/// *
///  * Time-based pricing for AI models
model AIModelPricing {
  id                  String    @id @default(uuid())
  aiModelId           String
  promptTokenCost     Float
  completionTokenCost Float
  effectiveFrom       DateTime
  effectiveUntil      DateTime?
  createdAt           DateTime  @default(now())
  aiModel             AIModel   @relation(fields: [aiModelId], references: [id], onDelete: Cascade)

  @@index([aiModelId, effectiveFrom])
  @@index([effectiveFrom, effectiveUntil])
}

/// *
///  * Company-specific AI model assignments
model CompanyAIModel {
  id        String   @id @default(uuid())
  companyId String
  aiModelId String
  isDefault Boolean  @default(false)
  createdAt DateTime @default(now())
  aiModel   AIModel  @relation(fields: [aiModelId], references: [id], onDelete: Cascade)
  company   Company  @relation(fields: [companyId], references: [id], onDelete: Cascade)

  @@unique([companyId, aiModelId])
  @@index([companyId, isDefault])
}

/// *
///  * ENUMS – fewer magic strings
enum UserRole {
  ADMIN
  USER
  AUDITOR
}

enum SentimentCategory {
  POSITIVE
  NEUTRAL
  NEGATIVE
}

enum SessionCategory {
  SCHEDULE_HOURS
  LEAVE_VACATION
  SICK_LEAVE_RECOVERY
  SALARY_COMPENSATION
  CONTRACT_HOURS
  ONBOARDING
  OFFBOARDING
  WORKWEAR_STAFF_PASS
  TEAM_CONTACTS
  PERSONAL_QUESTIONS
  ACCESS_LOGIN
  SOCIAL_QUESTIONS
  UNRECOGNIZED_OTHER
}

enum ProcessingStage {
  CSV_IMPORT
  TRANSCRIPT_FETCH
  SESSION_CREATION
  AI_ANALYSIS
  QUESTION_EXTRACTION
}

enum ProcessingStatus {
  PENDING
  IN_PROGRESS
  COMPLETED
  FAILED
  SKIPPED
}