// Edit me — the panels regenerate as you type.
abi ERC20 from "./abis/ERC20.json"

entity Account {
  id: Id<Bytes>
  balance: BigInt
  label: Option<String>          // nullable — there is no `null`
}

entity Transfer immutable {
  id: Id<Bytes>
  from: Account
  to: Account
  value: BigInt
  timestamp: BigInt
}

source Token {
  abi: ERC20
  network: mainnet
  address: 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
  startBlock: 6082465
}

handler on Token.Transfer(event) {
  let sender = Account.loadOrCreate(event.params.from, { balance: BigInt.zero })
  let receiver = Account.loadOrCreate(event.params.to, { balance: BigInt.zero })

  sender.balance = sender.balance - event.params.value
  receiver.balance = receiver.balance + event.params.value

  Transfer.create(event.id, {
    from: event.params.from,
    to: event.params.to,
    value: event.params.value,
    timestamp: event.block.timestamp,
  })
}