### GENERIC TYPES ***

"""
Represents a collateral or debt position.
"""
type Position @entity {
  "User Ethereum address concatenated with token contract address"
  id: ID!
  "Token amount"
  amount: BigDecimal!
  "Token details"
  token: Token!
}

"""
Represents a basic ERC20 token.
"""
type Token @entity {
  "Contract address"
  id: ID!
  "Token decimals"
  decimals: Int!
  "Token name"
  name: String!
  "Token symbol"
  symbol: String!
}

"""
High-level overview.
"""
type Hifi @entity {
  "Always set to 1"
  id: ID!
  "Array of all listed bonds"
  listedBonds: [Token!]!
  "Array of all listed collaterals"
  listedCollaterals: [Token!]!
  "Array of all AMM pools"
  pools: [Pool!]!
  "Array of all user vaults"
  vaults: [Vault!]!
}

"""
Stores the collaterals deposited by the user, along with the debts.
"""
type Vault @entity {
  "User Ethereum address"
  id: ID!
  "Collaterals deposited"
  collaterals: [Position!]!
  "Creation block timestamp"
  createTime: BigInt!
  "Debts owed by the vault owner"
  debts: [Position!]!
}

"""
Stores the pool reserves, along with the swaps.
"""
type Pool @entity {
  "Pool contract address"
  id: ID!
  "HToken in pool"
  hToken: Token!
  "Pool reserve of hToken"
  hTokenReserve: BigDecimal!
  "The hToken maturity timestamp"
  maturity: BigInt!
  "Array of all pool trades"
  swaps: [Swap!]! @derivedFrom(field: "pool")
  "Underlying in pool"
  underlying: Token!
  "Pool reserve of underlying token"
  underlyingReserve: BigDecimal!
}

type Swap @entity {
  "Sequential id"
  id: ID!
  "Account that sends token being sold"
  from: Bytes!
  "hTokens swapped"
  hTokenAmount: BigDecimal!
  "Pool where swap occurred"
  pool: Pool!
  "Fee paid by user for swap (in underlying)"
  swapFee: BigDecimal!
  "Timestamp for when the swap happened"
  timestamp: BigInt!
  "Account that receives token being bought"
  to: Bytes!
  "Underlying tokens swapped"
  underlyingAmount: BigDecimal!
}