React

"use client"
import { useCallback, useEffect, useState } from "react"
import { createPublicClient, http, parseAbi } from "viem"
import { addresses } from "./addresses"

const client = createPublicClient({ transport: http() })
const oracleAbi = parseAbi(["function regime() view returns (uint8)"])
const lensAbi = parseAbi(["function maxBorrow(address account) view returns (uint256)"])

export function useBorrowGate(account: `0x${string}` | undefined, oracle: `0x${string}`) {
  const [regime, setRegime] = useState<number>()
  const [power, setPower] = useState<bigint>()
  const refresh = useCallback(async () => {
    const [r, p] = await Promise.all([
      client.readContract({ address: oracle, abi: oracleAbi, functionName: "regime" }),
      account
        ? client.readContract({ address: addresses.riskLens, abi: lensAbi, functionName: "maxBorrow", args: [account] })
        : Promise.resolve(0n),
    ])
    setRegime(Number(r))
    setPower(p)
  }, [account, oracle])
  useEffect(() => { refresh() }, [refresh])
  return { canBorrow: regime === 0, power, refresh }
}

// Same reads without React. See TypeScript getting started.

interface IEquityOracle {
    function regime() external view returns (uint8);
}