export async function getTrustWalletInjectedProvider({ timeout } = { timeout: 3000 }) {
  const provider = getTrustWalletFromWindow();

  if (provider) {
    return provider;
  }

  return listenForTrustWalletInitialized({ timeout });
}

async function listenForTrustWalletInitialized({ timeout } = { timeout: 3000 }) {
  return new Promise((resolve) => {
    const handleInitialization = () => {
      resolve(getTrustWalletFromWindow());
    };

    window.addEventListener('trustwallet#initialized', handleInitialization, {
      once: true,
    });

    setTimeout(() => {
      (window as any)?.removeEventListener('trustwallet#initialized', handleInitialization, {
        once: true,
      });
      resolve(null);
    }, timeout);
  });
}

function getTrustWalletFromWindow() {
  const isTrustWallet = (ethereum: any) => {
    // Identify if Trust Wallet injected provider is present.
    const trustWallet = !!ethereum.isTrust;

    return trustWallet;
  };

  const injectedProviderExist =
    typeof window !== 'undefined' && typeof (window as any).ethereum !== 'undefined';

  // No injected providers exist.
  if (!injectedProviderExist) {
    return null;
  }

  // Trust Wallet was injected into window.ethereum.
  if (isTrustWallet((window as any).ethereum)) {
    return (window as any).ethereum;
  }

  // Trust Wallet provider might be replaced by another
  // injected provider, check the providers array.
  if ((window as any).ethereum?.providers) {
    // ethereum.providers array is a non-standard way to
    // preserve multiple injected providers. Eventually, EIP-5749
    // will become a living standard and we will have to update this.
    return (window as any).ethereum.providers.find(isTrustWallet) ?? null;
  }

  // Trust Wallet injected provider is available in the global scope.
  // There are cases that some cases injected providers can replace window.ethereum
  // without updating the ethereum.providers array. To prevent issues where
  // the TW connector does not recognize the provider when TW extension is installed,
  // we begin our checks by relying on TW's global object.
  return (window as any)['trustwallet'] ?? null;
}