// 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"
}

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

// ==================== 用户模块 ====================

model User {
  id            String   @id @default(uuid())
  email         String   @unique
  password      String
  name          String?
  avatarUrl     String?  @map("avatar_url")
  
  role          String   @default("user")
  status        String   @default("active")
  
  kbQuota       Int      @default(3) @map("kb_quota")
  kbUsed        Int      @default(0) @map("kb_used")
  
  trialEndsAt   DateTime? @map("trial_ends_at")
  isTrial       Boolean  @default(true) @map("is_trial")
  
  lastLoginAt   DateTime? @map("last_login_at")
  createdAt     DateTime @default(now()) @map("created_at")
  updatedAt     DateTime @updatedAt @map("updated_at")
  
  projects      Project[]
  conversations Conversation[]
  knowledgeBases KnowledgeBase[]
  documents     Document[]
  adminLogs     AdminLog[]
  
  @@index([email])
  @@index([status])
  @@index([createdAt])
  @@map("users")
}

// ==================== 项目模块 ====================

model Project {
  id                String   @id @default(uuid())
  userId            String   @map("user_id")
  name              String
  background        String   @default("") @db.Text
  researchType      String   @default("observational") @map("research_type")
  conversationCount Int      @default(0) @map("conversation_count")
  
  createdAt         DateTime @default(now()) @map("created_at")
  updatedAt         DateTime @updatedAt @map("updated_at")
  deletedAt         DateTime? @map("deleted_at")
  
  user              User     @relation(fields: [userId], references: [id], onDelete: Cascade)
  conversations     Conversation[]
  
  @@index([userId])
  @@index([createdAt])
  @@index([deletedAt])
  @@map("projects")
}

// ==================== 对话模块 ====================

model Conversation {
  id           String   @id @default(uuid())
  userId       String   @map("user_id")
  projectId    String?  @map("project_id")
  agentId      String   @map("agent_id")
  title        String
  modelName    String   @default("deepseek-v3") @map("model_name")
  messageCount Int      @default(0) @map("message_count")
  totalTokens  Int      @default(0) @map("total_tokens")
  metadata     Json?
  
  createdAt    DateTime @default(now()) @map("created_at")
  updatedAt    DateTime @updatedAt @map("updated_at")
  deletedAt    DateTime? @map("deleted_at")
  
  user         User     @relation(fields: [userId], references: [id], onDelete: Cascade)
  project      Project? @relation(fields: [projectId], references: [id], onDelete: Cascade)
  messages     Message[]
  
  @@index([userId])
  @@index([projectId])
  @@index([agentId])
  @@index([createdAt])
  @@index([deletedAt])
  @@map("conversations")
}

model Message {
  id             String   @id @default(uuid())
  conversationId String   @map("conversation_id")
  role           String
  content        String   @db.Text
  model          String?
  metadata       Json?
  tokens         Int?
  isPinned       Boolean  @default(false) @map("is_pinned")
  
  createdAt      DateTime @default(now()) @map("created_at")
  
  conversation   Conversation @relation(fields: [conversationId], references: [id], onDelete: Cascade)
  
  @@index([conversationId])
  @@index([createdAt])
  @@index([isPinned])
  @@map("messages")
}

// ==================== 知识库模块 ====================

model KnowledgeBase {
  id             String   @id @default(uuid())
  userId         String   @map("user_id")
  name           String
  description    String?
  difyDatasetId  String   @map("dify_dataset_id")
  fileCount      Int      @default(0) @map("file_count")
  totalSizeBytes BigInt   @default(0) @map("total_size_bytes")
  
  createdAt      DateTime @default(now()) @map("created_at")
  updatedAt      DateTime @updatedAt @map("updated_at")
  
  user           User     @relation(fields: [userId], references: [id], onDelete: Cascade)
  documents      Document[]
  
  @@index([userId])
  @@index([difyDatasetId])
  @@map("knowledge_bases")
}

model Document {
  id              String   @id @default(uuid())
  kbId            String   @map("kb_id")
  userId          String   @map("user_id")
  filename        String
  fileType        String   @map("file_type")
  fileSizeBytes   BigInt   @map("file_size_bytes")
  fileUrl         String   @map("file_url")
  difyDocumentId  String   @map("dify_document_id")
  status          String   @default("uploading")
  progress        Int      @default(0)
  errorMessage    String?  @map("error_message")
  segmentsCount   Int?     @map("segments_count")
  tokensCount     Int?     @map("tokens_count")
  
  uploadedAt      DateTime @default(now()) @map("uploaded_at")
  processedAt     DateTime? @map("processed_at")
  
  knowledgeBase   KnowledgeBase @relation(fields: [kbId], references: [id], onDelete: Cascade)
  user            User     @relation(fields: [userId], references: [id], onDelete: Cascade)
  
  @@index([kbId])
  @@index([userId])
  @@index([status])
  @@index([difyDocumentId])
  @@map("documents")
}

// ==================== 运营管理模块 ====================

model AdminLog {
  id           Int      @id @default(autoincrement())
  adminId      String   @map("admin_id")
  action       String
  resourceType String?  @map("resource_type")
  resourceId   String?  @map("resource_id")
  details      Json?
  ipAddress    String?  @map("ip_address")
  userAgent    String?  @map("user_agent")
  
  createdAt    DateTime @default(now()) @map("created_at")
  
  admin        User     @relation(fields: [adminId], references: [id], onDelete: Cascade)
  
  @@index([adminId])
  @@index([createdAt])
  @@index([action])
  @@map("admin_logs")
}