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

datasource db {
  provider = "sqlite" // still OK for local/dev; use Postgres in prod
  url      = "file:./dev.db"
}

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

enum SentimentCategory {
  POSITIVE
  NEUTRAL
  NEGATIVE
}

/**
 * COMPANY  (multi-tenant root)
 */
model Company {
  id             String  @id @default(uuid())
  name           String
  csvUrl         String
  csvUsername    String?
  csvPassword    String?
  sentimentAlert Float?
  dashboardOpts  Json? // JSON column instead of opaque string

  users    User[]          @relation("CompanyUsers")
  sessions Session[]
  imports  SessionImport[]

  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt
}

/**
 * USER  (auth accounts)
 */
model User {
  id       String   @id @default(uuid())
  email    String   @unique
  password String
  role     UserRole @default(USER)

  company   Company @relation("CompanyUsers", fields: [companyId], references: [id], onDelete: Cascade)
  companyId String

  resetToken       String?
  resetTokenExpiry DateTime?

  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt
}

/**
 * SESSION ↔ SESSIONIMPORT   (1-to-1)
 */

/**
 * 1.  Normalised session ---------------------------
 */
model Session {
  id        String  @id @default(uuid())
  company   Company @relation(fields: [companyId], references: [id], onDelete: Cascade)
  companyId String

  /**
   * 1-to-1 link back to the import row
   */
  import   SessionImport? @relation("ImportToSession", fields: [importId], references: [id])
  importId String?        @unique

  /**
   * session-level data (processed from SessionImport)
   */
  startTime DateTime
  endTime   DateTime
  
  // Processed fields from SessionImport data
  ipAddress              String?
  country                String?  // processed from countryCode
  language               String?  // processed from language
  messagesSent           Int?
  sentiment              Float?   // processed from sentimentRaw
  sentimentCategory      SentimentCategory?
  escalated              Boolean?
  forwardedHr            Boolean?
  fullTranscriptUrl      String?
  avgResponseTime        Float?   // processed from avgResponseTimeSeconds
  tokens                 Int?
  tokensEur              Float?
  category               String?
  initialMsg             String?  // processed from initialMessage
  
  // Processing metadata
  processed              Boolean  @default(false)
  questions              String?  // JSON array of extracted questions
  summary                String?  // AI-generated summary

  /**
   * ---------- the missing opposite side ----------
   */
  messages Message[] // <-- satisfies Message.session

  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@index([companyId, startTime])
}

/**
 * 2.  Raw CSV row waiting to be processed ----------
 */
enum ImportStatus {
  QUEUED
  PROCESSING
  DONE
  ERROR
}

model SessionImport {
  id        String  @id @default(uuid())
  company   Company @relation(fields: [companyId], references: [id], onDelete: Cascade)
  companyId String

  /**
   * 1-to-1 back-relation; NO fields/references here
   */
  session Session? @relation("ImportToSession")

  // ─── 16 CSV columns 1-to-1 ────────────────────────
  externalSessionId      String  @unique // value from CSV column 1
  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?

  // ─── Raw transcript content ─────────────────────────
  rawTranscriptContent   String? // Fetched content from fullTranscriptUrl

  // ─── bookkeeping ─────────────────────────────────
  status      ImportStatus @default(QUEUED)
  errorMsg    String?
  processedAt DateTime?
  createdAt   DateTime     @default(now())

  @@unique([companyId, externalSessionId]) // idempotent re-imports
  @@index([status])
}

/**
 * MESSAGE  (individual lines)
 */
model Message {
  id String @id @default(uuid())

  session   Session @relation(fields: [sessionId], references: [id], onDelete: Cascade)
  sessionId String

  timestamp DateTime?
  role      String // "user" | "assistant" | "system" – free-form keeps migration easy
  content   String
  order     Int

  createdAt DateTime @default(now())

  @@unique([sessionId, order]) // guards against duplicate order values
  @@index([sessionId, order])
}