import { Wallet, ZeroAddress, ZeroHash, randomBytes, hexlify } from "ethers";

async function fillOrder() {
  // get the following from https://api.sx.bet/metadata
  const EIP712FillHasherAddress = process.env.EIP712_FILL_HASHER_ADDRESS;
  const chainId = Number(process.env.CHAIN_ID); // Mainnet — use 79479957 for testnet
  const domainVersion = process.env.DOMAIN_VERSION;

  const wallet = new Wallet(process.env.SX_PRIVATE_KEY);
  const takerAddress = wallet.address;
  const stakeWei = "50000000"; // 50 USDC
  const marketHash = "0x0246b760b06009ece42d08e706563de1967e7f1b4799d0f559244e3f80bbc496"; // Liverpool vs Arsenal
  const baseToken = "0x6629Ce1Cf35Cc1329ebB4F63202F3f197b3F050B"; // Mainnet — see References for testnet address
  const desiredOdds = "83000000000000000000"; // ~1.20 decimal odds
  const oddsSlippage = 5; // 5% slippage, so worst decimal odds ~1.14
  const isTakerBettingOutcomeOne = true; // taker is betting that team 1 wins
  const fillSalt = BigInt(hexlify(randomBytes(32))).toString();

  const domain = {
    name: "SX Bet",
    version: domainVersion,
    chainId,
    verifyingContract: EIP712FillHasherAddress,
  };

  const types = {
    Details: [
      { name: "action", type: "string" },
      { name: "market", type: "string" },
      { name: "betting", type: "string" },
      { name: "stake", type: "string" },
      { name: "worstOdds", type: "string" },
      { name: "worstReturning", type: "string" },
      { name: "fills", type: "FillObject" },
    ],
    FillObject: [
      { name: "stakeWei", type: "string" },
      { name: "marketHash", type: "string" },
      { name: "baseToken", type: "string" },
      { name: "desiredOdds", type: "string" },
      { name: "oddsSlippage", type: "uint256" },
      { name: "isTakerBettingOutcomeOne", type: "bool" },
      { name: "fillSalt", type: "uint256" },
      { name: "beneficiary", type: "address" },
      { name: "beneficiaryType", type: "uint8" },
      { name: "cashOutTarget", type: "bytes32" },
    ],
  };

  const message = {
    action: "N/A",
    betting: "N/A",
    stake: "N/A",
    worstOdds: "N/A",
    worstReturning: "N/A",
    market: marketHash,
    fills: {
      stakeWei,
      marketHash,
      baseToken,
      desiredOdds,
      oddsSlippage,
      isTakerBettingOutcomeOne,
      fillSalt,
      beneficiary: ZeroAddress,
      beneficiaryType: 0,
      cashOutTarget: ZeroHash,
    },
  };

  const signature = await wallet.signTypedData(domain, types, message);

  const apiPayload = {
    market: marketHash,
    baseToken,
    isTakerBettingOutcomeOne,
    stakeWei,
    desiredOdds,
    oddsSlippage,
    taker: takerAddress,
    takerSig: signature,
    fillSalt,
  };

  const response = await fetch(`https://api.sx.bet/orders/fill/v2`, { // Mainnet — use https://api.toronto.sx.bet for testnet
    method: "POST",
    body: JSON.stringify(apiPayload),
    headers: { "Content-Type": "application/json" },
  });
}

{
  "status": "success",
  "data": {
    "fillHash": "0x840763ae29b7a6adfa0e315afa47be30cdebd5b793d179dc07dc8fc4f0034965",
    "isPartialFill": false,
    "totalFilled": "50000000",
    "averageOdds": "73000000000000000000"
  }
}