// prisma/schema.prisma - OCS 答题服务数据库 schema
// 包含 Better Auth 认证表（User, Session, Account, Verification）和业务表（QaRecord）

generator client {
  provider = "prisma-client"
  output   = "./generated"
}

datasource db {
  provider = "mysql"
}

// Better Auth 标准用户表
// apiToken 由服务端注册 hook 生成，供 OCS 油猴脚本跨域身份验证
model User {
  id             String     @id
  name           String
  email          String     @unique
  emailVerified  Boolean
  image          String?
  createdAt      DateTime
  updatedAt      DateTime
  apiToken       String?    @unique
  /// 用户最近一次清缓存的时间；只有在此时间之后写入的记录才算缓存命中
  cacheClearedAt DateTime?
  sessions       Session[]
  accounts       Account[]
  qaRecords      QaRecord[]

  @@map("user")
}

// Better Auth 会话表
model Session {
  id        String   @id
  expiresAt DateTime
  token     String   @unique
  createdAt DateTime
  updatedAt DateTime
  ipAddress String?
  userAgent String?
  userId    String
  user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)

  @@map("session")
}

// Better Auth 账号表（用于邮密和 OAuth Provider 关联）
model Account {
  id                    String    @id
  accountId             String
  providerId            String
  userId                String
  user                  User      @relation(fields: [userId], references: [id], onDelete: Cascade)
  accessToken           String?
  refreshToken          String?
  idToken               String?   @db.Text
  accessTokenExpiresAt  DateTime?
  refreshTokenExpiresAt DateTime?
  scope                 String?
  password              String?
  createdAt             DateTime
  updatedAt             DateTime

  @@map("account")
}

// Better Auth 邮箱验证令牌表
model Verification {
  id         String    @id
  identifier String
  value      String
  expiresAt  DateTime
  createdAt  DateTime?
  updatedAt  DateTime?

  @@map("verification")
}

// 用户问答记录，按用户隔离存储
// search 接口在拿到有效 session 或 apiToken 后写入，与当前登录用户绑定
model QaRecord {
  id        String   @id @default(cuid())
  userId    String
  user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)
  question  String   @db.Text
  type      String
  options   String?  @db.Text
  answer    String?  @db.Text
  /// 题目+题型+选项的 MD5，用于 DB 缓存查询；老记录为 null
  hash      String?  @db.Char(32)
  createdAt DateTime @default(now())

  @@index([userId, hash])
  @@map("qa_record")
}