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

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

// 用户表（预留扩展）
model User {
  id        String    @id @default(cuid())
  email     String    @unique
  name      String?
  createdAt DateTime  @default(now())
  updatedAt DateTime  @updatedAt
  accounts  Account[]
}

// 账户表
model Account {
  id           String        @id @default(cuid())
  userId       String
  user         User          @relation(fields: [userId], references: [id])
  name         String
  marketType   MarketType
  baseCurrency String
  balance      Decimal       @default(0) @db.Decimal(20, 4)
  createdAt    DateTime      @default(now())
  updatedAt    DateTime      @updatedAt
  transactions Transaction[]
  positions    Position[]

  @@index([userId])
}

enum MarketType {
  US      // 美股
  CN      // A股
  HK      // 港股
  CRYPTO  // 加密货币
}

// 证券参考表
model Security {
  id             String     @id @default(cuid())
  symbol         String     @unique
  name           String
  market         MarketType
  currency       String
  lotSize        Int        @default(1)   // 港股每手股数，A股=100
  priceDecimals  Int        @default(2)   // 价格精度
  qtyDecimals    Int        @default(0)   // 数量精度：股票=0，crypto=8
  isCrypto       Boolean    @default(false)
  createdAt      DateTime   @default(now())
  updatedAt      DateTime   @updatedAt
}

// 交易流水表
model Transaction {
  id            String          @id @default(cuid())
  accountId     String
  account       Account          @relation(fields: [accountId], references: [id])
  type          TransactionType
  symbol        String?
  quantity      Decimal?        @db.Decimal(20, 8)
  price         Decimal?        @db.Decimal(20, 8)
  amount        Decimal          @db.Decimal(20, 4)
  fee           Decimal          @default(0) @db.Decimal(20, 4)
  networkFee    Decimal?        @db.Decimal(20, 8)
  currency      String
  exchangeRate  Decimal?        @db.Decimal(20, 8)
  notes         String?
  executedAt    DateTime
  createdAt     DateTime        @default(now())

  @@index([accountId, executedAt])
  @@index([symbol])
}

enum TransactionType {
  DEPOSIT   // 入金
  WITHDRAW  // 出金
  BUY       // 买入
  SELL      // 卖出
  DIVIDEND  // 分红
  INTEREST  // 利息
  FEE       // 费用/手续费
}

// 持仓表（查询优化）
model Position {
  id          String   @id @default(cuid())
  accountId   String
  account     Account  @relation(fields: [accountId], references: [id])
  symbol      String
  quantity    Decimal  @db.Decimal(20, 8)
  averageCost Decimal  @db.Decimal(20, 8)
  currency    String
  updatedAt   DateTime @updatedAt

  @@unique([accountId, symbol])
  @@index([accountId])
}

// 汇率参考表
model ExchangeRate {
  id            String   @id @default(cuid())
  fromCurrency  String
  toCurrency    String
  rate          Decimal  @db.Decimal(20, 8)
  effectiveDate DateTime
  createdAt     DateTime @default(now())

  @@unique([fromCurrency, toCurrency, effectiveDate])
  @@index([fromCurrency, toCurrency])
}