// Helpers for steering mobile users into a wallet's in-app browser.
//
// On mobile, WalletConnect can silently lose the signature response when the
// browser is backgrounded during signing (the relay WebSocket is torn down).
// The robust fix — used by Polymarket itself — is to open the dApp *inside*
// the wallet's own browser: there is no app switching, the wallet injects an
// EIP-1193 provider, and signing happens natively with no relay involved.

export function isMobile(): boolean {
  if (typeof navigator === 'undefined') return false;
  return /Android|iPhone|iPad|iPod/i.test(navigator.userAgent);
}

// An injected EIP-1193 provider means we're already inside a wallet's in-app
// browser (mobile) or a desktop extension — either way, no banner is needed.
export function hasInjectedProvider(): boolean {
  if (typeof window === 'undefined') return false;
  return !!(window as { ethereum?: unknown }).ethereum;
}

// Show the "open in wallet" banner only for mobile users without an injected
// provider — exactly the population that hits the WalletConnect signing bug.
export function shouldSuggestWalletBrowser(): boolean {
  return isMobile() && !hasInjectedProvider();
}

export interface WalletDeepLink {
  name: string;
  url: string;
}

// Each wallet uses its own deep-link scheme — there is no standard. We preserve
// the current path/query so the user lands on the same page inside the wallet.
export function buildWalletDeepLinks(): WalletDeepLink[] {
  if (typeof window === 'undefined') return [];
  const { host, pathname, search } = window.location;
  const bare = `${host}${pathname}${search}`; // no scheme — MetaMask format
  const full = `https://${bare}`;
  const encoded = encodeURIComponent(full);

  return [
    { name: 'MetaMask', url: `https://metamask.app.link/dapp/${bare}` },
    { name: 'Coinbase', url: `https://go.cb-w.com/dapp?cb_url=${encoded}` },
    { name: 'Trust', url: `https://link.trustwallet.com/open_url?url=${encoded}` },
  ];
}