import { requestWalletNonce, verifyWalletSignature } from "./api";

export type EthereumProvider = {
  request: <T = unknown>(args: {
    method: string;
    params?: unknown[];
  }) => Promise<T>;
};

export function getInjectedEthereum(): EthereumProvider | null {
  if (typeof window === "undefined") return null;
  const maybeWindow = window as typeof window & { ethereum?: EthereumProvider };
  return maybeWindow.ethereum ?? null;
}

export async function signInWithInjectedWallet(): Promise<{
  token: string;
  wallet: string;
}> {
  const ethereum = getInjectedEthereum();
  if (!ethereum) throw new Error("No injected wallet found");

  const accounts = await ethereum.request<string[]>({
    method: "eth_requestAccounts",
  });
  const address = accounts[0];
  if (!address) throw new Error("No wallet account returned");

  const nonce = await requestWalletNonce(address);
  const signature = await ethereum.request<string>({
    method: "personal_sign",
    params: [nonce.message, address],
  });
  return verifyWalletSignature({
    address,
    message: nonce.message,
    signature,
  });
}