// This is your Prisma schema file,
// learn more about it in the docs: https://pris.ly/d/prisma-schema

generator client {
  provider        = "prisma-client-js"
  output          = "./client-generated"
  binaryTargets   = ["native", "debian-openssl-3.0.x"] // Force OpenSSL 3.x for Debian Slim
}

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

model User {
  id            String    @id @default(cuid())
  name          String?
  email         String    @unique
  emailVerified DateTime?
  password      String?   // Hashed password
  role          String    @default("USER") // "USER" or "ADMIN"
  image         String?
  theme         String    @default("light")
  resetToken       String?   @unique
  resetTokenExpiry DateTime?
  accounts      Account[]
  sessions      Session[]
  notes         Note[]
  labels        Label[]
  notebooks     Notebook[] // NEW: Relation to notebooks
  receivedShares NoteShare[] @relation("ReceivedShares")
  sentShares     NoteShare[] @relation("SentShares")

  // Phase 1 AI Relations
  aiFeedback     AiFeedback[]
  aiSettings     UserAISettings?
  memoryEchoInsights MemoryEchoInsight[]

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

model Account {
  userId            String
  type              String
  provider          String
  providerAccountId String
  refresh_token     String?
  access_token      String?
  expires_at        Int?
  token_type        String?
  scope             String?
  id_token          String?
  session_state     String?
 
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt
 
  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
 
  @@id([provider, providerAccountId])
}
 
model Session {
  sessionToken String   @unique
  userId       String
  expires      DateTime
  user         User     @relation(fields: [userId], references: [id], onDelete: Cascade)
 
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt
}
 
model VerificationToken {
  identifier String
  token      String
  expires    DateTime
 
  @@id([identifier, token])
}

// NEW: Notebook model for organizing notes
model Notebook {
  id        String   @id @default(cuid())
  name      String
  icon      String?  // Emoji or icon name
  color     String?  // Hex color for personalization
  order     Int      // Manual order for drag & drop
  userId    String
  user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)
  notes     Note[]   // Notes can belong to a notebook
  labels    Label[]  // Labels are contextual to this notebook
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@index([userId, order])
  @@index([userId])
}

model Label {
  id        String   @id @default(cuid())
  name      String
  color     String   @default("gray")
  notebookId String?  // TEMPORARY: Optional for migration, will be required later
  notebook  Notebook? @relation(fields: [notebookId], references: [id], onDelete: Cascade)
  notes     Note[]   // NEW: Many-to-many relation with notes
  userId    String?  // DEPRECATED: Kept for migration, will be removed after migration
  user      User?    @relation(fields: [userId], references: [id], onDelete: Cascade)
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@unique([notebookId, name]) // NEW: Labels are unique within a notebook (ignored if notebookId is null)
  @@index([notebookId])
  @@index([userId]) // DEPRECATED: Keep for now, remove after migration
}

model Note {
  id                  String    @id @default(cuid())
  title               String?
  content             String
  color               String    @default("default")
  isPinned            Boolean   @default(false)
  isArchived          Boolean   @default(false)
  type                String    @default("text") // "text" or "checklist"
  checkItems          String?   // For checklist items stored as JSON string
  labels              String?   // Array of label names stored as JSON string (DEPRECATED)
  images              String?   // Array of image URLs stored as JSON string
  links               String?   // Array of link metadata stored as JSON string
  reminder            DateTime? // Reminder date and time
  isReminderDone      Boolean   @default(false)
  reminderRecurrence  String?   // "none", "daily", "weekly", "monthly", "custom"
  reminderLocation    String?   // Location for location-based reminders
  isMarkdown          Boolean   @default(false) // Whether content uses Markdown
  size                String    @default("small") // "small", "medium", "large"
  embedding           String?   // Vector embeddings stored as JSON string for semantic search
  sharedWith           String?   // Array of user IDs (collaborators) stored as JSON string
  userId              String?   // Owner of the note
  user                User?     @relation(fields: [userId], references: [id], onDelete: Cascade)
  shares              NoteShare[] // All share records for this note
  order               Int       @default(0)

  // NEW: Notebook relation (optional - null = "Notes générales" / Inbox)
  notebookId          String?   // NULL = note is in general notes
  notebook            Notebook? @relation(fields: [notebookId], references: [id], onDelete: SetNull)

  // NEW: Many-to-many relation with labels
  labelRelations      Label[]   // Uses implicit _NoteToLabel junction table

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

  // Phase 1 AI Extensions
  autoGenerated       Boolean?  // True if title/content was AI-generated
  aiProvider          String?   // 'openai' | 'ollama'
  aiConfidence        Int?      // 0-100 (collected Phase 1, UI Phase 3)
  language            String?   // ISO 639-1: 'fr', 'en', 'es', 'de', 'fa'
  languageConfidence  Float?    // 0.0-1.0
  lastAiAnalysis      DateTime? // Timestamp of last AI analysis

  // Relations for Phase 1 AI
  aiFeedback          AiFeedback[]
  memoryEchoAsNote1   MemoryEchoInsight[] @relation("EchoNote1")
  memoryEchoAsNote2   MemoryEchoInsight[] @relation("EchoNote2")

  @@index([isPinned])
  @@index([isArchived])
  @@index([order])
  @@index([reminder])
  @@index([userId])
  @@index([userId, notebookId]) // NEW: For filtering notes by notebook
}

model NoteShare {
  id          String    @id @default(cuid())
  noteId      String
  note        Note      @relation(fields: [noteId], references: [id], onDelete: Cascade)
  userId      String
  user        User      @relation("ReceivedShares", fields: [userId], references: [id], onDelete: Cascade)
  sharedBy    String    // User ID who shared the note
  sharer      User      @relation("SentShares", fields: [sharedBy], references: [id], onDelete: Cascade)
  status      String    @default("pending") // "pending", "accepted", "declined", "removed"
  permission  String    @default("view") // "view", "comment", "edit"
  notifiedAt  DateTime?
  respondedAt DateTime?
  createdAt   DateTime  @default(now())
  updatedAt   DateTime  @updatedAt

  @@unique([noteId, userId])
  @@index([userId])
  @@index([status])
  @@index([sharedBy])
}

model SystemConfig {
  key   String @id
  value String
}

// Phase 1 MVP AI Models

model AiFeedback {
  id                String    @id @default(cuid())
  noteId            String
  userId            String?
  feedbackType      String    // 'thumbs_up' | 'thumbs_down' | 'correction'
  feature           String    // 'title_suggestion' | 'memory_echo' | 'semantic_search' | 'paragraph_refactor'
  originalContent   String    // JSON string of AI-generated content
  correctedContent  String?   // User's modified version
  metadata          String?   // JSON string for additional data (provider, model, timestamp)
  createdAt         DateTime  @default(now())

  note              Note      @relation(fields: [noteId], references: [id], onDelete: Cascade)
  user              User?     @relation(fields: [userId], references: [id], onDelete: Cascade)

  @@index([noteId])
  @@index([userId])
  @@index([feature])
}

model MemoryEchoInsight {
  id              String    @id @default(cuid())
  userId          String?
  note1Id         String
  note2Id         String
  similarityScore Float
  insight         String    // AI-generated explanation of the connection
  insightDate     DateTime  @default(now())
  viewed          Boolean   @default(false)
  feedback        String?   // 'thumbs_up' | 'thumbs_down'
  dismissed       Boolean   @default(false) // User dismissed this connection

  note1           Note      @relation("EchoNote1", fields: [note1Id], references: [id], onDelete: Cascade)
  note2           Note      @relation("EchoNote2", fields: [note2Id], references: [id], onDelete: Cascade)
  user            User?     @relation(fields: [userId], references: [id], onDelete: Cascade)

  @@unique([userId, insightDate])
  @@index([userId, insightDate])
  @@index([userId, dismissed]) // For filtering dismissed connections
}

model UserAISettings {
  userId                String    @id

  // Feature Flags (granular ON/OFF)
  titleSuggestions      Boolean   @default(true)
  semanticSearch        Boolean   @default(true)
  paragraphRefactor     Boolean   @default(true)
  memoryEcho            Boolean   @default(true)

  // Configuration
  memoryEchoFrequency   String    @default("daily")  // 'daily' | 'weekly' | 'custom'
  aiProvider            String    @default("auto")    // 'auto' | 'openai' | 'ollama'
  preferredLanguage     String    @default("auto")    // 'auto' | 'en' | 'fr' | 'es' | 'de' | 'fa' | 'it' | 'pt' | 'ru' | 'zh' | 'ja' | 'ko' | 'ar' | 'hi' | 'nl' | 'pl'
  fontSize              String    @default("medium")  // 'small' | 'medium' | 'large' | 'extra-large'
  demoMode              Boolean   @default(false)    // Demo mode for testing Memory Echo

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

  // Indexes for analytics
  @@index([memoryEcho])
  @@index([aiProvider])
  @@index([memoryEchoFrequency])
  @@index([preferredLanguage])
}