Open a loan

import { parseAbi } from "viem"
import { addresses } from "./addresses" // Addresses, testnet

const coreAbi = parseAbi([
  "function setOperator(address operator, bool approved)",
  "function isOperator(address account, address operator) view returns (bool)",
])

await wallet.writeContract({
  address: addresses.stockline,
  abi: coreAbi,
  functionName: "setOperator",
  args: [addresses.positionRouter, true],
})

interface IStockline {
    function setOperator(address operator, bool approved) external;
}

// User calls this on Stockline, not on the router.
// IStockline(core).setOperator(router, true);

const routerAbi = parseAbi([
  "function openPosition(uint16 bookId, uint256 supplyAmount, uint256 borrowAmount, (uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) permit)",
])

const bookId = 8
const supplyAmount = 10n * 10n ** 18n
const borrowAmount = 1n * 10n ** 18n
const emptyPermit = { value: 0n, deadline: 0n, v: 0, r: "0x" + "00".repeat(32), s: "0x" + "00".repeat(32) }

await wallet.writeContract({
  address: addresses.positionRouter,
  abi: routerAbi,
  functionName: "openPosition",
  args: [bookId, supplyAmount, borrowAmount, emptyPermit],
})

struct PermitData {
    uint256 value;
    uint256 deadline;
    uint8 v;
    bytes32 r;
    bytes32 s;
}

interface IPositionRouter {
    function openPosition(uint16 bookId, uint256 supplyAmount, uint256 borrowAmount, PermitData calldata permit) external;
}